• 专利附录
  • 专利说明
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    • 专利摘要:
    BEARING BEARING UNIT WITH ENCODER FOR ONE WHEEL SUPPORT. The achieved construction is able to avoid strain deformation in the axial direction of a flat plate section 21 of a cover 19a when a cylinder section 20 of the cover 19a, which covers the opening over the inner end in the axial direction of an internal space where an encoder 1 is located, it is fitted inside and attached to the inner end section in the axial direction of an outer ring 7. A non-contact section 26a is formed all the way around the inner end section in the axial direction of the section of cylinder 20 so that the outer diameter is less than the inner diameter of the inner end section in the axial direction of the outer ring, and the dimension L26 in the axial direction has twice or more the density dimension t19 of a plate member of the cover 19a. With the cover 19a fitted inside the inner end section in the axial direction of the outer ring 7, only the portion of the cylinder section 20 that is closer to the outside in the axial direction than the non-contact section 26a is substantially fitted inside. of the inner end section in the axial direction of the outer ring 7 with an interference fit.
    公开号:BR112012020797B1
    申请号:R112012020797-0
    申请日:2011-02-07
    公开日:2020-07-28
    发明作者:Jiunya Inahoe；Yoshio Kaneko；Masato Nagano
    申请人:Nsk Ltd；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [0001] The present invention relates to a rolling bearing unit with an encoder for supporting an automobile wheel so that it is able to rotate freely with respect to the suspension, and for determining the rotational speed of the wheel. More specifically, the present invention relates to an improvement of a bearing housing unit with encoder comprising the construction in which a cover, which covers an opening on the inner end in the axial direction of an internal space where the encoder is located , which is fitted inside and fixed to the inner end section in the axial direction of the outer ring. BACKGROUND OF THE TECHNIQUE
    [0002] Several constructions for a bearing housing unit with a rotational speed detector for supporting a wheel by suspending an automobile in a way that allows it to rotate freely, and for determining the rotational speed of the wheel were previously known. In facilitating any of the conventional constructions, a sensor detection section that is supported by and attached to a non-rotating part is made to face a detected surface of an encoder that is supported by and attached to part of a axis of the wheel that rotates together with the wheel. In this construction, the rotational speed of the wheel that rotates with the encoder is found based on the frequency or period of an output signal from the sensor that changes as the encoder rotates.
    [0003] In order to protect the encoder of this type of rolling bearing unit with rotational speed detector from giving due to muddy water or dust adherence to the encoder, or, in order to prevent foreign matter such as magnetic dust from being adhered to to the encoder and damage the safety of the rotational speed detector using the encoder, the construction as shown in JP 4206550 (B2) and DE 19644744 (Al) is separated from the encoder from the outside by a cover made from a non magnetic is conventionally shown. Figure 11 illustrates an example of conventional construction, as shown in JP 4206550 (132). This conventional construction comprises a bearing housing unit 2 with an encoder on which an encoder 1 is mounted, and a sensor 4 which is supported by and attached to a gasket 3 of the suspension.
    [0004] In the bearing housing unit 2 with encoder, the encoder 1 is supported by and fixed to the inner end section in the axial direction of the wheel shaft 6 of the bearing housing unit 5 so that it is concentric to the wheel axis 6. In addition to the wheel axle 6, the bearing housing unit 5 comprises an outer ring 7 and a plurality of bearing elements 8. The outer ring 7 has double rows of outer ring ducts 9 around the circumferential inner surface and a fixed flange 10 on the circumferential outer surface. During operation, the outer ring 7 is supported by joint 3 and does not rotate.
    [0005] The wheel axle 6 comprises a main wheel axle body 11, and an inner ring 12 which is connected to and fixed to the main wheel axle body 11 by a corrugated section 13 which is formed on the end section. inner in the axial direction of the main wheel axle body 11; the axle of the wheel 6 having double rows of inner ring ducts 14 around the circumferential outer surface thereof, and is supported on the inner diameter side of the outer ring 7 so that it is concentric to the outer ring. In addition, a rotatable side flange 15 for wheel support is provided over the outer end section in the axial direction of the main wheel axle body 11 in the portion that protrudes further out in the axial direction beyond the opening over the end of the part in the axial direction of the outer ring. The bearing elements 8 are located between both outer ring conduits 9 and both inner ring conduits 14, with the bearing elements supported by a cage 16 in each row, so that they are able to rotate freely. In addition, both end sections in the axial direction of the internal space 17 where the bearing elements 8 are located are covered by a seal ring 18 and a cover 19. In this specification, the "outside" in the axial direction is the side in towards the outside towards the width of the vehicle when mounted on the suspension. On the other hand, the "interior" in the axial direction is the lateral towards the center towards the width of the vehicle when mounted on the suspension.
    [0006] Cover 19 is formed using a non-magnetic metal plate such as an aluminum alloy plate, or austenitic stainless steel plate, or some other non-magnetic material. This type of cover 19 comprises a cylindrical section 20 which extends in the axial direction, and a flat plate section 21 which is foldable and extends inwardly in the radial direction from the inner end section in the axial direction of this cylindrical section 20. In construction in figure 11, the bearing housing unit 5 is applied to a guided wheel (rear wheel for an FF vehicle, front wheel for an FR vehicle or MR vehicle), so that the flat plate section 21 has a plate shape circular covering the entire opening over the inner end in the axial direction of the outer ring 7. On the other hand, in the case of a roller bearing unit for a guide wheel (front wheel for an FF vehicle, rear wheel for an FR vehicle or MR, and any wheel for a 4WD vehicle), in the construction presented in DE 19644744 (Al), and the flat plate section has an annular shape so that the guide column can be inserted into the inner diameter side of the cover. In both cases, the cover 19 is such that the cylindrical section 20 fits within the inner end section in the axial direction of the outer ring 7 with an interference fit, and is fitted to the inner end section in the axial direction of the outer ring 7.
    [0007] The base end section of encoder 1 is fitted over a section with shoulder 22 which is formed on the lower half of the inner ring 12, which corresponds to the portion towards the inner end of the wheel axle 6, so that the encoder 1. It is supported concentric by and fixed to the axle of the wheel 6. The encoder 1 comprises a support ring 23 which is formed inside a circular ring shape with a cross section in an “L” shape by the folding of a magnetic metal plate like Tomás steel plate, and a main coding body 24 which is made using a permanent magnet like a rubber magnet. This main coding body 24 is magnetized in the axial direction, and by changing the magnetization direction at uniform intervals in the circumferential direction, the S poles and N poles are alternated at uniform intervals on the lateral surface in the axial direction, which is the detected surface. The detected surface of this type of main encoder body 24 is made to face closely through a small slot in the surface of the outer part in the axial direction of the flat plate section, 21 of the cover 19 (surface on the inner space side). In other words, the cover 19 is pushed over the inner end section in the axial direction of the outer ring 7 until the surface of the outer part in the axial direction of the flat plate section 21 is close to and facing the detected surface of the main encoder body 24,
    [0008] Additionally, with sensor 4 supported by and attached to joint 3, the detection section of sensor 4 is placed in contact with the inner surface (surface on the side of outer space) in the axial direction of the flat plate section 21 In the state, the detection section faces the detected surface of the main coding body 24 in the guise of the flat plate section 21. In this state, as the main coding body 24 rotates together with the wheel axis 6, the poles S and N poles on the detected surface alternatively approach the detection section of sensor 4, which causes the output of sensor 4 to change. The frequency of this change is proportional to the rotational speed of the wheel axis 6, and the period of this change is inversely proportional to the rotational speed, therefore, based on either or both the frequency and period, the rotational speed of the wheel that is fixed to the wheel axle 6 is found.
    [0009] In the case of the conventional construction illustrated in figure 11, the main encoding body 24 of the permanent magnet and the outer space are separated by the non-magnetic cover 19, so that it is possible to prevent foreign matter such as magnetic powder from adhering to the surface detected from the main coding body 24. As a result, this detected surface is kept in a clean state, making it possible to maintain the safety of the rotational speed detector using this main coding body 24. However, there is a need to improve the accuracy related to distance between the detected surface of the main encoder body 24 and the sensor detection section 4.
    [00010] In other words, when the cylindrical section 20 is fitted inside the inner end section in the axial direction of the outer ring 7 with an interference fit so that the cover 19 is supported by and fixed to the outer ring 7, a force is applied in a direction inward of the radial direction of the flat plate section 21 which is on the inner diameter side of the cylindrical section 20. Particularly, in the case of this conventional construction, the radius of curvature of a bending section that exists in the continuous section between the outer circumferential edge of the flat plate section 21 and the edge over the inner end in the axial direction of the cylindrical section 20 is small (in other words, foldable with a wide curvature), and the portion that fits inside and is attached to the outer ring 7 with an interference fit extending to near the outer circumferential edge of the flat plate section 21. Therefore, the inward force in the radial direction that is applied to the section The flat plate 21 becomes considerably large and, due to this force, the flat plate section 21 deforms in the direction of density (in and out in the axial direction) in order to form the curve.
    [00011] The direction of deformation and the amount of deformation cannot be regulated or predicted, so that the position in the axial direction of the portion on the flat plate section 21 between the detected surface of the main coding body 24 and the detection section of sensor 4 cannot be adjusted with good accuracy. For example, when sensor 4 positioned by the sensor detection section 4 contacts the inner surface in the axial direction of the flat plate section 21 (surface on the outer space side), this positioning becomes inaccurate when the flat plate 21 is distorted. As a result, there is a fluctuation in the density of the magnetic flux that reaches the detection section of the sensor 4 from the detected surface of the main coding body 24, which is disadvantageous from the aspect of maintaining the security of rotational speed detection. Related Literature Patent Literature Patent Literature 1 JP4206550 (B2) Patent Literature 2 DE19644744 (A1) SUMMARY OF THE INVENTION Problem to be solved by the invention
    [00012] In consideration of the above situation, it is the objective of the present invention to achieve the construction capable of preventing deformation in the axial direction of the cover portion, which covers the opening over the inner end in the axial direction of the internal space where the encoder is located, additionally on the inner diameter side than on the portion that is fitted inside and fixed to the inner end section in the axial direction of the outer ring, in other words, the flat plate section of the cover which is curved and extends inward from the radial direction from the inner end section to the axial direction of the cylindrical section of the cover, when the cover is fitted inside and fixed to the outer ring. Means for solving problems
    [00013] The bearing unit with encoder for support of a wheel of the present invention, similar to a conventional bearing unit with encoder for support of a wheel has an outer ring, a bearing shaft, a plurality of elements bearing, encoder and cover.
    [00014] The outer ring has double-row outer ring conduits around the circumferential inner surface thereof, and is supported by and attached to a suspension during use in order not to rotate. The wheel axle has double-row inner ring ducts around the circumferential outer surface thereof, and with a wheel supported by and attached to it during use, which rotates together with the wheel. The bearing elements are provided so that there are a plurality of bearing elements located in each row between both outer ring ducts and both inner ring ducts. The encoder is supported by and fixed to the wheel axis so that it is concentric to the wheel axis, with the inner surface in the axial direction of the same being a detected surface that has a magnetic characteristic that, alternatively, changes in the circumferential direction.
    [00015] Additionally, the cover is made of a non-magnetic material plate, and comprises a cylinder section that extends in the axial direction, and a flat plate section that is curved and extends inwardly in the radial direction from the inner end section in the axial direction of the cylinder section. Together with this cylinder section fitted within the inner end section in the axial direction of the outer ring, the flat plate section is directly opposite the detected surface of the encoder.
    [00016] Particularly, in the bearing housing unit with encoder for supporting a wheel of the present invention, a non-contact section is formed all the way around the inner end section in the axial direction of the cover cylinder section so that do not contact the circumferential inner surface of the outer ring when the cover is fitted inside and attached to the outer ring.
    [00017] In other words, the non-contact section has an outer diameter smaller than the inner diameter of the inner end section in the axial direction of the outer ring. In addition, the dimension in the axial direction of the non-contact section is twice or more, or preferably three times or more, the density dimension of the cover plate member. Upon discovering that this value is twice (three times) the density value, the dimension value in the axial direction of the non-contact section is the distance value between the position in the axial direction of the inner surface in the axial direction of the flat plate section of the cover and the position in the axial direction of the starting point of contact between the cylinder section of the cover and the outer ring in the state where the cylinder section of the cover is fitted inside and fixed to the inside, the section being in the axial direction of the outer ring with an interference fit and the cylinder section of the cover are elastically deformed.
    [00018] With the provision of this type of non-contact section, when the cover is fitted inside the inner end section in the axial direction of the outer ring, the cylinder section is fitted inside the inner end section in the axial direction of the ring external so that only the deeper portion on the outside in the axial direction than the non-contact section fits inside with an interference fit.
    [00019] When incorporating the encoder bearing unit for support of a wheel of the present invention, the non-contact section is preferably formed within a partial tapered cylindrical shape that is tilted in one direction so that the diameter becomes smaller going inward in the axial direction. Alternatively, the non-contact section is preferably made up of a small diameter section with a small section located between the section with small diameter and the portion close to the outside in the axial direction,
    [00020] When incorporating the encoder bearing unit for support of a wheel of the present invention, preferably the surface of the inner end in the axial direction of the outer ring protrudes inward in the axial direction on a larger scale than the inner end surface of the flat plate section. Additionally, when incorporating the encoder bearing unit for supporting a wheel of the present invention, preferably a gap is formed between the detected surface of the encoder and the surface of the outer part in the axial direction of the flat plate section of the cover which faces the detected encoder surface, and this gap is larger than a gap formed between the outer end surface in the axial direction of the cover cylinder section and an inner surface in the axial direction of a counter-hole additionally formed near the inner end in the axial direction of the outer ring on a larger scale than the outer ring conduit and faces the outer end surface in the axial direction of the cylinder section of the cover. Alternatively, or in addition, it is preferable that the gap between the detected surface of the encoder and the surface of the outer part in the axial direction of the flat plate section of the cover facing the detected surface of the encoder is larger than a gap between the inner end surface in the axial direction of the wheel axle and the outer part surface in the axial direction of the cover facing the inner end surface in the axial direction of the wheel axle. Effect of the invention
    [00021] As described above, with the roller bearing unit with encoder for supporting a wheel of the present invention, when a cover, which covers the opening over the inner end in the axial direction of the internal space where the encoder is located, is fitted and fixed inside the inner end section in the axial direction of the outer ring, a force that is applied inwardly in the radial direction to the flat plate section of the cover is reduced due to the non-contact section that exists between the cylinder section fitted and fixed and the flat plate section, in order to make it possible to cancel the transmission of force to the flat plate section, and in this way it is possible to avoid strain deformation in the axial direction of this flat plate section. Consequently, it becomes possible to fine-tune the position in the axial direction of the flat plate section facing the detected surface of the encoder and the surface precision of the same including perpendicularity and the like. As a result, when combined with the sensor for rotational speed detection, the density of the magnetic flux that leaves from the detected surface of the encoder and reaches the sensor detection section can be maintained sufficiently and guaranteed and, thus, makes - it is possible to maintain safety for rotational speed detection. BRIEF DESCRIPTION OF THE DRAWINGS
    [00022] Figure 1 is a partial cross-sectional view of a first example of an embodiment of the present invention.
    [00023] Figure 2 is an enlarged partial cross-sectional view of the top part in Figure 1, and illustrates the shape of a cover in the first example of an embodiment of the present invention.
    [00024] Figure 3 is an enlarged partial cross-sectional view of the top part in Figure 1, and illustrates the shape of a cover in a second example of an embodiment of the present invention.
    [00025] Figure 4A and figure 4B are similar to figure 2 and figure 3, in which figure 4 is a variation of the first example and figure 4B is a variation of the second example, with the circumferential outer surface of the non-contact section it is coated with a sealing material.
    [00026] Figure 5 is an enlarged partial cross-sectional view illustrating a third example of an embodiment of the present invention.
    [00027] Figure 6 is an enlarged partial cross-sectional view illustrating a fourth example of an embodiment of the present invention.
    [00028] Figure 7 is an enlarged partial cross-sectional view illustrating a fifth example of an embodiment of the present invention.
    [00029] Figure 8 is an enlarged partial cross-sectional view illustrating a sixth example of an embodiment of the present invention.
    [00030] Figure 9 is an enlarged partial cross-sectional view illustrating a seventh example of an embodiment of the present invention.
    [00031] Figure 10 is an enlarged partial cross sectional view illustrating a variation of the seventh example, the outer circumferential surface of the non-contact section being covered with a sealing material.
    [00032] Figure 11 is a partial cross-sectional view that illustrates an example of conventional construction. MODES FOR CARRYING OUT THE INVENTION Example 1
    [00033] Figure 1 and figure 2 illustrate a first example of an embodiment of the present invention. A feature of the wheel bearing unit with encoder for supporting a wheel of the present invention, including this example, is the construction in which a cover 19a to 19d is fitted inside and fixed to the inner end section in the axial direction of a ring outer 7 in order to cover the opening on the inner end in the axial direction of an internal space 17, where the bearing elements 8 and the encoder 1 are located, and the deformation in the direction of density (axial direction of the holding unit which includes this cover) of the side plate sections 21 of the cover 19a to 19d is canceled. The construction and functions of other parts are the same as the rolling bearing unit with encoder for supporting a conventional wheel, so the drawings and explanations of these parts are simplified or omitted, with the explanation below focusing on the characteristics of the present invention.
    [00034] The cover 19a to 19d is made through the use of the non-magnetic plate as an austenitic stainless steel plate such as SUS304, the aluminum alloy plate, or synthetic resin plate, and comprises a cylindrical section 20 that extends in the direction axial over the outer circumference section of the cover 19a to 19d, and a flat plate section 21 over the inner end section in the axial direction that curves and extends inwardly in the radial direction from the cylindrical section 20. The cylindrical section 20 is fitted inside and fixed to the inner end section in the axial direction of the outer ring 7 with an interference fit. In this state, the outer part surface in the axial direction of the flat plate section 21 (inner space side surface) is made to face closely through a tiny slot 25, a detected surface (inner surface in the axial direction) of a main encoder body 24 of an encoder 1 which is fitted over and attached to a portion of a wheel axis 6 near the inner end in the axial direction.
    [00035] In the first example of an embodiment of the present invention, a non-contact section 26a is formed all the way around the inner end section in the axial direction of the cylindrical section 20 of the cover 19a. In this example, the non-contact section 26a has a partial tapered cylindrical shape that is tilted in one direction so that the diameter becomes smaller by going inward in the axial direction. Here, the non-contact section 26a means a portion of the cylindrical section 20 that does not come into contact with the circumferential inner surface of the outer ring 7 when the cylindrical section 20 of the cover 19a is engaged inside and fixed to the inner end in the axial direction of the ring. outer 7 with an interference fit and the cylindrical section 20 of the cover 19a deforms elastically. The end section on the smaller diameter side (inner end section in the axial direction) of this non-contact section 26a has an outer diameter B26 smaller than the inner radius R7 of the inner end section in the axial direction of the outer ring 7 (R7 > D26). Therefore, when the cover 19a is fitted inside the inner end section in the axial direction of the outer ring 7, the circumferential inner surface of the outer ring 7 and the circumferential outer surface of the cylindrical section 20 of the cover 19a do not come into contact with the axial direction in the non-contact section 26a, without both circumferential surfaces being pushed in the radial direction by each other. The portion of the cylindrical section 20 which is engaged within the inner end in the axial direction of the outer ring 7 with an interference fit is only the portion closer to the outer part in the axial direction than the non-contact section 26a.
    [00036] In addition, the dimension L26 in the axial direction of the non-contact section 26a is twice or more the size of the tw density of the cover plate material 19a (L26 2tw), and preferably three times or more than (L26 3ti9). The flat plate section 21 is curved and extends inwardly in the radial direction from the end section over the smaller diameter side (inner end section in the axial direction) of the non-contact section 26a. From the deformation-canceling aspect of the flat plate section 21, the larger the dimension L26 in the axial direction, the more preferable. However, when the dimension L26 in the axial direction is excessively large, the deformation canceling effect cannot increase further, and the dimension in the axial direction of the interference fitting that contributes to the fixation of the cover 19a to the outer ring 7 becomes small, What is disadvantageous from the aspect that maintains the strength of the cover support 19a. Therefore, the dimension L26 in the axial direction is 50% smaller or even less than the length in the axial direction of the cover 19a (L26 0.5 Lw), and preferably around 20% to 35%. In this example, when the cover 19a is fitted inside and fixed to the inner end section in the axial direction of the outer ring 7, there is a possibility that part of the axial direction of the portion of the cylindrical section 20 that has a partial tapered cylindrical shape in its free state will contact the circumferential inner surface of the outer ring 7, so that the dimension L26 in the axial direction of the non-contact section 26a is determined as the value of the distance between the position in the axial direction of the inner surface in the axial direction of the flat plate section 21 of the cover 19a and the starting point of contact between the cylindrical section of the cover 19a and the outer ring 7 (starting point of the socket) when the cover 19a is attached to the outer ring 7 and the outer circumference section of the cover 19a is elastically deformed, instead of the value measured in its free state.
    [00037] From the aspect of avoiding deformation due to the interference fit, in relation to the mooring of the roof density 19a, it is realistic that the dimension l_26 is around five times the tw density of the roof 19a (L26 <5 tw ). When a good balance is generally taken into account between maintaining the strength of the roof support 19a and preventing deformation, it is preferable that the dimension L26 in the axial direction is regulated around three to four times the tw density of the roof 19a, or in other words L26 = (3 to 4) tia However, because it is sufficiently capable of maintaining the dimension L20 in the axial direction of the cylindrical section 20, as long as it is possible to maintain the dimension in the axial direction of the plug-in section although the dimension L26 in the direction axial is increased, it is possible that the dimension L26 in the axial direction even exceeds five times the tw density of the cover 19a. However, the increase in the dimension L26 in the axial direction to more than ten times the tw density of the cover 19a is not real.
    [00038] When fitting the cylindrical sections 20 of the cover 19a inside the inner end section in the axial direction of the outer ring 7, only the portion of the cylindrical section 20 that is closer to the outside in the axial direction than the non-contact section 26a is fitted inside the outer ring with an interference fit. The portion of the cylindrical section 20 which is close to the inner end in the axial direction and which is on the outer diameter side of the flat plate section 21 is constructed by the non-contact section 26a, and when the cover 19a is snapped in and attached to the section from the inner end in the axial direction of the outer ring 7, there is a gap 28 between the circumferential outer surface of the non-contact section 26a and the circumferential inner surface of the inner end section in the axial direction of the outer ring7. Therefore, the circumferential outer surface of this non-contact section 26a is not pressed inwardly in the radial direction. In this example, the position in the axial direction of the inner end surface in the axial direction of the cover 19a (surface on the outer space side) coincides with the position in the axial direction of the inner end surface of the outer ring 7, and the cover 19a does not. protrudes inward in the axial direction beyond the outer ring 7.
    [00039] The portion which is fitted within the inner end section in the axial direction of the outer ring 7, and which is located in the part of the cylindrical section 20 that is closer to the outer part in the axial direction than the non-contact section 26a it is strongly pressed inward in the radial direction. However, the non-contact section 26a exists all the way around between the portion in the axial direction which is fitted inside the outer ring 7 with an interference fit and the flat plate section 21. Therefore, even when a powerful force is applied inwardly in the radial direction to the portion where it is fitted within the outer ring 7 with an interference fit, a greater portion of this force is consumed by causing the non-contact section 26a located between the portion which is fitted within the interior of the outer ring 7 with an interference fit and the flat plate section 21 deform, and do not reach the flat plate section 21. As a result, stress deformation in the axial direction of the flat plate section 21 extending inwardly into radial direction from the outer circumference section of the cover 19a is avoided, and the position in the axial direction of the flat plate section 21 which faces the detected surface (inner surface in the axial direction) of the main encoder body 24 of encoder 1 can be adjusted with good precision. In addition, the square shape of this portion is also good. In other words, the change in the portion on the inner surface in the axial direction of the flat plate section 21 that comes into contact with the sensor detection portion 4a from a virtual plane that is orthogonal to the central geometric axis can be maintained at zero or in small numbers.
    [00040] As a result of being able to regulate the position in the axial direction of the portion of the flat plate section 21 that faces the detected surface of encoder 1 and the surface precision of this section, such as perpendicularity, with good precision, it is possible, when the sensing section of sensor 4a for rotational speed detection is in contact with the inner surface in the axial direction of the flat plate section 21, in order to maintain the posture of sensor 4a and the position in the axial direction of the section of detection within it, the values are projected with good precision. Also, with the sensor detection section 4a and the detected surface of the main encoder body 24 facing each other in the guise of the flat plate section 21 (in a state with the encoder and the rotational speed detection sensor assembled together), the density of the magnetic flux reaching the sensor detection section 4a from the detected surface of the main coding body 24 is adequately and certainly maintained and, in this way, it is possible to maintain the security of the rotational speed detection .
    [00041] Furthermore, the inclination angle a2 of the generation line of the non-contact section 26a in relation to the central geometric axis is preferably 10 ° to 45 °, and more preferably 10 ° to 55 °, and even more preferably 15 ° at 25 °. The closer the angle of inclination there is, the more preferable the range of 15 ° to 25 °, to avoid strain deformation in the axial direction of the flat plate section 21 that exists in the portion closest to the inner diameter of the cover 19a. Furthermore, when forming the inclination angle ai 45 ° or less, the occurrence of shear drop in the curved section between the cylindrical section 20 and the flat plate section 21 during processing is suppressed and, thus, the variation in the departure in the axial direction of the locking section, and the occurrence of peak pressure of the locking surface due to the occurrence of shear drop are also repressed. Taking into account the stability of the fitting by pressure of the cover 19a on the outer ring 7, it is preferable that the angle of inclination ai be a smaller value within the above range.
    [00042] Preferably the outer diameter dimension D24 of the main encoder body 24 is less than the value obtained when the outer diameter D26 of the end section over the smaller diameter side of the non-contact section 26a (inner end section in the axial direction) ) is reduced twice less than the plate density of the cover 19a (D24 <D26 -2tw). In other words, preferably, contact in the radial direction between the portion of the circumferential inner surface of the non-contact section 26a and the outer circumferential edge of the main coding body 24 is avoided by regulating the dimensions in the radial direction of each part of this path . More preferably, the outer diameter D21 of the main encoder body 24 is less than a value obtained when the outer diameter D24 of the end section over the smaller diameter side of the non-contact section 26a is reduced three times less than the cover plate density. 19a (D24 <D26 -3tig). Example 2
    [00043] Figure 3 illustrates a second example of an embodiment of the present invention. This second example of an embodiment of the present invention differs from the first example in that the non-contact section 26b is constructed by a small diameter step section with a protruding section 27 located between it and the portion close to the outside in the axial direction. . In this case too, the non-contact section 26b (cylindrical portion more internal than the protruding section 27) has an outer diameter D26 that is less than the inner radius R7 of the inner end section in the axial direction of the outer ring 7 (R7> D26 ), so that with the cylindrical section 20 of the cover 19b fitted inside the inner end section in the axial direction of the outer ring 7, there is no contact between the circumferential inner surface of the outer ring 7 and the circumferential outer surface of the non-contact section 26b. In this example as well, the dimension L26 in the axial direction of the non-contact section 26b is preferably twice or more (L36> 2tw) and five times or less (L26 5ti9). The size of the density density tw of the roof plate material 19b, and most preferably, L26 = (3 to 4) x ti9. Furthermore, this dimension L25 in the axial direction is 50% or less the length length L10 in the axial direction of the cover 19b (L26 0.5Lis), and is preferably 20% to 35% the length L19. The protruding section 27 is formed, after the partial tapered cylindrical section shown in the first example is formed, with the rounded surface section on the inner diameter side and the tapered surface on the outer diameter side between the partial tapered cylindrical section and the cylinder section 20 fixed, and with the rounded surface section on the inner diameter side between the partial tapered cylindrical section and the supported flat plate section 21, by applying a punch from the inside of the axial direction towards the partial conical cylindrical section. Therefore, according to the first example, the occurrence of shear drop on the side of a cylindrical section is repressed. Additionally, preferably the inclination angle 02 of the common tangent line of two rounded surface sections on the outside diameter side of the non-contact section 26b in relation to the central geometric axis is 10 ° to 45 °, and more preferably 10 ° to 5 °, and even more preferably, 15 ° to 25 °. With the construction of this second example, the same function and effect as the first example are obtained.
    [00044] In the roller bearing unit with encoder for supporting a wheel of this present invention, including the first and second examples, a non-contact section 26a, 26b which is provided to prevent undulation of the flat plate section 21, can be used to improve the sealing performance of the roof installation section 19a, 19b. In other words, as shown in figures 4A and 4B, it is possible to fill in a sealing material 29 made using an elastic material that includes an elastomer such as rubber or vinyl over the circumferential outer surface of the non-contact section 26a, 26b in order to cover the non-contact section 26a, 26b with this seal material 19. The outer diameter of this seal material 29 in its free state is greater than the inner diameter of the inner end section in the axial direction of the outer ring 7 By maintaining this type of sealing material 29 in an elastically compressed state in the radial direction around the entire circumference between the circumferential outer surface of the non-contact section 26a, 26b and the circumferential inner surface of the inner end section in the direction axial of the outer ring 7, the best in the sealing performance of the installation section is possible. As this sealing material 29 is elastically compressed, the force applied inside in the radial direction for the flat plate section 21 is limited, and with the supply of sealing material 29, no harmful arching or undulation occurs in the flat plate 21.
    [00045] The sealing of the installation section can also be maintained by filling the non-contact section 26a, 26b by veante (caulking agent) as a gel instead of the sealing material 29 which has elasticity as described above. In this case, after the cylindrical section 20 of the cover 19a, 19b has been fitted inside and fixed to the inner end section in the axial direction of the outer ring 7, the sealing agent is introduced inside the slot 28. Furthermore, after the surface circumferential outer section of the cylindrical section 20 having been coated by the sealing agent, it is possible to fit this cylindrical section 20 inside the outer ring 7. In addition, it is also possible to maintain the sealing of the installation section by covering the surface of the cover 19a, 191 , including the circumferential outer surface of the cylindrical section 20, with a coating film made of a resin paint using electrode deposition, and securing the film between the circumferential outer surface of the cylindrical section 20 and the circumferential inner surface of the section inner end in the axial direction of the outer ring 7. Example 3
    [00046] Figure 5 illustrates a third example of an embodiment of the present invention. In this example, a concave section 30 is formed in the central section in the radial direction of the cover 19c. More specifically, the innermost portion in the radial direction than the flat plate section 21 of the cover 19c causes the outer portion to protrude in the axial direction (inner space side). The detected surface of the main coding body 24 faces the outer surface in the axial direction of the flat plate section 21 (surface on the inner space side). By providing this type of concave section 30, the rigidity of the flat plate section 21 is improved, and it becomes possible to make the flat plate section 21 a more accurate and better flat surface. Also in this case, the inclination angle ai of the non-contact section is preferably from 5 ° to 45 °, and more preferably from 10 ° to 35 °, and more preferably from 15 ° to 26 °. As a result, it becomes possible to fit and fix the cover 19c inside the inner end section in the axial direction of the outer ring 7, while maintaining the flat shape accuracy of the flat plate section 21 in the best way. internal diameter of the flat plate section 21 is 25% or greater than the diameter Dw of the cover 19c, and it is established within a range such that the concave section 30 does not come into contact with the main coding body 24 or the like. Furthermore, in view of the ease of processing and the anti-deformation effect, the angle of the tapered surface of the concave section 30 protrudes from the flat plate section 21 to the outside in the axial direction regulated within the range of 5 ° to 90 °, and preferably from 20 ° to 70 °. Example 4
    [00047] Figure 6 illustrates a fourth example of an embodiment of the present invention. In facilitating the fourth example shown in figure 8, the length in the axial direction over the inner end section in the axial direction of the outer ring 7 from the inner surface in the axial direction of the fixed side flange 10, is less than the construction in the first example illustrated in figure 1. In other words, in this example, the dimension of the inner end section in the axial direction of the outer ring 7 is decreased, and this outer ring 7 does not exist on the outer part in the radial direction of the non-contact section 26a of cover 19a. In the case of the construction of this example, the wedge-shaped slot 28 (see figure 1) that is formed between the circumferential outer surface of the non-contact section 26a of the cover 19a and the circumferential inner surface of the inner end section of the outer ring 7 is eliminated. Therefore, it is possible to prevent foreign matter such as water from being kept in the portion of this gap 28 even when there is no sealing material 29 as illustrated in the variation (see figure 4) of the first and second examples and, in this way, it is possible to prevent the foreign matter, such as water, enter the bearing housing unit, thus preventing the occurrence of rust. It is also possible to use sealing material in conjunction with this construction. In this case, the sealing material comes in elastic contact around the entire circumference of part of the outer ring 7, such as the inner end surface in the axial direction of the outer ring 7. Example 5
    [00048] Figure 7 illustrates a fifth example of an embodiment of the present invention. In the case of the fifth example illustrated in figure 7, the length in the axial direction over the inner end section in the axial direction of the outer ring 7 from the inner surface in the axial direction of the fixed side flange 10 is greater than that of the construction of the first example illustrated in figure 1. In other words, in this example, the dimension of the inner end section in the axial direction of the outer ring 7 is stretched and protrudes more inwardly in the axial direction than the flat surface section 21 of the cover 19a. in the case of the construction of this example, the inner end section in the axial direction of the outer ring 7 that protrudes inward in the axial direction serves as protection for the cover 19a, and makes it possible to avoid pressuring the cover 19a in the wrong way during assembly, or deformation, of the cover 19a due to impact by stones and the like when the vehicle is on the road. Additionally, because sensor 4a is also covered by the spare end section in the axial direction of the outer ring 7, sensor 4a can be protected from dust, stones and the like. The construction of this example can also be easily used together with the sealing material, in which case the sealing material comes in contact in an elastic way around the circumferential outer surface of the inner end section in the axial direction of the outer ring 7. Example 6
    [00049] Figure 8 illustrates a sixth example of an embodiment of the present invention. In facilitating this sixth example illustrated in figure 8, the length in the axial direction over the inner end section of the outer ring 7 from the inner surface in the axial direction of the fixed side flange 10 is slightly longer than in the construction of the first illustrated example in figure 1. In other words, in this example, the dimension of the inner end section in the axial direction of the outer ring 7 is extended a little, and protrudes in an amount D in the axial direction more than the flat surface section 21 coverage 19a. In addition, with the outer end section in the axial direction of the cylindrical section 20 facing the counter-hole 32 of the outer ring conduit 9 with a remaining slot C, the cylindrical section 20 is fitted inside and fixed to the cross section. inner end in the axial direction of the outer ring 7. Here, the outer part surface (surface on the inner space side) in the axial direction of the flat plate section 21 and the detected surface of the main coding body 24 are facing each other the other through a slot A, and a tiny slot 25. On the other hand, with the detection surface of the sensor 4a located inside in the axial direction by a slot B in relation to the inner end in the axial direction of the outer ring 7, sensor 4a is supported by and attached to the joint (not shown in the figure).
    [00050] In the case of the construction of this example, slot A is established to be larger than slot C (A> C). As a result, even when the cover 19a can be pressed out in the axial direction, the cover 19a does not come into contact with the main coding body 24. Additionally, having a slot B and a spare quantity D (B> 0, D > 0), there is a gap (B + D) between the opposite flat plate section 21 and the sensor detection surface 4a. Therefore, even when the flat plate section 21 may vibrate or bulge due to a rise in the internal bearing pressure, the cover 19a and the sensor 4a do not come into contact with each other, so it is possible to avoid friction wear of the detection surface of sensor 4a, and damage to the sensor element due to wear. The construction of this example can easily be used in conjunction with a sealing material, and in this facilitation the sealing material comes in elastic contact around the entire circumferential inner surface of the inner end section in the axial direction of the outer ring 7. In the case of use in a compact car, slot A can be set to 0.5 ± 0.1 mm, slot B can be set to 0.1 ± 0.1 mm, slot C can be set to 0.25 ± 0 , 25 mm, slot D can be set to 0.1. ± 0.1 mm, and the gap (B + D) between the sensor 4a and the flat plate section 21 can be adjusted to 0.2 ± 0.2 mm, however the dimensions are not limited to these measurements. Example 7
    [00051] Figure 9 and Figure 10 illustrate a seventh example of an embodiment of the present invention. In the seventh example illustrated in figure 9, the construction differs from the construction of the first example illustrated in figure 1 in that the main encoder body 24 of encoder 1a is fixed to the inner surface in the axial direction of the circular ring section of a support ring 23 which it has a cross section with “L” shape and a general ring shape, however, the length in the axial direction of the support ring 23 is small, and an inner ring 12 of the wheel axle 6 and a corrugated section 13 of the axle body main wheel 11 protrude inwardly in the axial direction more than the detected surface (inner surface in the axial direction) of the main encoder body 24. In this example, a convex section 31 is formed in the central section in the radial direction of the cover 19d. More specifically, the portion on the inside in the radial direction is made so that it protrudes towards the inside in the axial direction (lateral from outer space) more than the flat plate section of the cover 19d. The detected surface of the main encoder body 24 faces the outer surface in the axial direction of the flat plate section 21 (surface on the inner space side). By providing this type of convex section 31, as in the third example of the modality, it is possible to improve the rigidity of the flat plate section 21 and makes the flat plate section 21 a flat surface that has better accuracy. The internal diameter of the flat plate section 21 is as 25% or more than the diameter Dw of the cover 19d. In addition, taking into account each of the processes and the anti-deformation effect, the angle of the tapered surface that protrudes from the flat plate section of the convex section 31 inwards in the axial direction is adjusted to be in the range of 5 ° to 90 ° , and is preferably set for the range of 20 ° to 70 °.
    [00052] In this example, the tiny slot 25 (slot "a") between the outer surface in the axial direction of the flat plate section 21 of the cover 19d (surface on the inner space side) and the opposite detected surface of the body main encoder 24 (inner surface in the axial direction) is set to be larger than the slot "b" between the outer part surface in the axial direction of the flat plate section 21 and the inner surface in the axial direction of the inner ring 12 (a > b) opposite. As a result, even in the case where the cover 19d is pressed out in an axial direction, the cover 19d comes into contact with the portion (point d) of the flat plate section 21 of the cover 19d that is closest to the surface over the inner end in the axial direction of the inner ring 12, so that the cover 19d does not come into contact with the main encoder body 24. Furthermore, in this example, the tiny slot 25 (slot "a") is set to be larger than the slot "c" between the outer surface in the axial direction of the convex section 31 of the cover 19d and the surface on the inner end in the axial direction of the corrugated section 13 of the main wheel axle body 11 (a> c) closely opposite. As a result, even in the case where the cover 19d is pressed out in the axial direction, the cover 19d comes into contact with the portion (point "e") that is closest to the surface on the inner end in the axial direction of the corrugated section 13 of the convex section 31 of the cover 19d, so that the cover 19d does not come into contact with the main encoder body 24. Taking into account the change in relative inclination or displacement of the outer and inner rings when a moment load is applied to the bearing due to reaction force of the road surface, and the accuracy of the pressure fitting location based on the outer ring when the encoder 23a and the cover 19d are pressed into the outer ring 7, the minimum value of the slot "a" is adjusted so that the main encoder body 24 and the cover 19d do not come into contact.
    [00053] In this example, the “b” gap is set to be larger than a “c” gap (b> c). When the bearing is fixed, the effect of contact at point "d" and contact at point "e" is the same, however, when the bearing is rotating, contact at point "e" where the circumferential speed is less is more preferable . Therefore, in the present invention, the ratio of the sizes of these slits is regulated in such a way that a> b> c, and is regulated in such a way that when the cover 19d is pressed out in the axial direction, contact is made first at the point "e ". The construction of this example can also be easily used together with a sealing material, in which case the sealing material comes in elastic contact around the entire circumferential inner surface of the inner end section in the axial direction of the outer ring 7 (see figure 10).
    [00054] A characteristic of this example is that the amount of movement of the flat plate section 21 in the axial direction when the cover 19d is pressed is regulated by a slot in the axial direction that exists between the cover 19d and the inner surface end in the axial direction of the wheel axle 6 (corrugated section 13 of the main wheel axle body 11 or the inner ring 12). Therefore, when providing cracks with the relationship (a> b, or a> c), an effect to prevent contact between the cover 19d and the main coding body 24 is obtained. As a result, in facilitating an encoder 1 for which it is difficult to determine possible problems due to the existence of the cover 19d, it is possible to avoid a state in which the position of the encoder 1 moves due to contact with the cover 19d and many errors of electromagnetic signals occur. Furthermore, due to the prevention effect of this type of contact, it is possible that the cover and the bearing are closer than before, so it is possible to make the wheel axle bearing compact.
    [00055] The present invention can be applied both if the entire surface of the flat plate section has a circular plate shape and extends in the radial direction to the central section as in the first, second, fourth, fifth and sixth examples, as in the case of the roof having a concave section 30 formed in the central section as in the third example, or in the case of the roof having a convex section 32 formed in the central section as in the seventh example. In addition, the present invention can also be applied in the case as shown in DE 19644744 (Al) where the cover has a circular ring shape with a large circular hole in the central section for the construction of a bearing housing unit with encoder for a guide wheel. Furthermore, if applicable, the characteristics of the examples can be applied to other examples. For example, the construction of the formation of a concave section in the central section of the third example, or the construction of the formation of a convex section in the central section of the seventh example can be used instead of the construction which comprises only the flat plate section above . In addition, it is possible to replace the construction of the third and seventh examples with the construction that has only the flat plate section. Additionally, it is possible to apply the relationship between the outer ring and the cover of the first, fourth and fifth examples in other examples, and to apply the slit regulation described in the sixth and seventh examples in other examples. Experimental Example
    [00056] An example of a test performed in order to confirm the effect of the present invention will be explained. In the test, cover 19c from the third example shown in figure 5 was used. The cover 19c was manufactured using the SUS304 stainless steel material which has a tw dimension density of 0.6 mm. The outer diameter Dw of this cover 19c was 57 mm, the length Lw in the axial direction was 7.8 mm, and the interference value (absolute value of the difference between the inner diameter of the inner end section in the axial direction of the outer ring 7 and the outer diameter Dw of the cover 19c) was 0.18 mm (180 pm).
    [00057] In this cover 19e, a section of conical convex partial surface that has a dimension in the axial direction of 2.2 mm and an inclination angle of about 20 ° has been formed. The cylindrical section 20 of this cover 19c was fitted inside the inner end section in the axial direction of the outer ring 7. In this state, as a specified position close to the outer diameter of the flat plate section was 0, the transformation amount, which was the amount of expansion or depression, the position of the flat plate section 21 that faces the detected surface of the main coding body 24 was measured with the use of a calibrator, and as a result of the maximum deformation value in this portion was 0.064 mm (64pm). Subsequently, the cover 19c was removed from the inlet ring 7 and the position of contact marks was checked, and when the dimension l_26a in the axial direction of the non-contact section was checked, the contact mark was slightly less than 2.2 mm , however twice or more (in fact, three times) the density (0.6 mm) of the plate was sufficiently maintained.
    [00058] As a comparison, a cover 19 that has the conventional construction was manufactured under the same conditions in this example except that a non-contact section was not provided, and the continuous section between the cylindrical section 20 and the flat plate section 21 was continuous in a section of curvature that has a large curve (the radius of curvature over the outer diameter side in its free state before fitting inside the inner end section in the axial direction of the outer ring 7 was small by 1.2 mm) , and the cylindrical section of this cover 19 was fitted inside the inner end section in the axial direction of the outer ring 7 which was the same in the above experimental example. When performing the same measurements, the portion of the flat plate section 21 that faces the detected surface of the main encoder body 24 deformed in the axial direction with a maximum value of 0.144 mm (144 pm). In other words, with the present invention, the amount of deformation of the flat plate section of the cover, and particularly, the portion of this flat plate section that is close to and facing the main coding body could be suppressed by around 45 % of the conventional part, and through this example, the effect of the present invention has been confirmed, Industrial applicability
    [00059] The bearing housing unit with encoder for support of a guide wheel can be applied appropriately to the rotational support of a wheel. Listing of Reference Numbers 1, 1a. Encoder 2 Bearing bearing unit with encoder 3 Gasket 4, 4a Sensor 5 Bearing bearing unit 6 Wheel axle 7 Outer ring 8 Rotating element 9 Outer ring conduit 10 Fixed side flange 11 Main wheel axle body 12 Ring inner 18 Corrugated section 14 Inner ring conduit 15 Rotatable side flange 16 Cage 17 Inner space 18 Sealing ring 19, 19a, 19b, 19c, 19d Cover 20 Cylindrical section 21 Flat plate section 22 Shoulder section 23 Support ring 24 Body main encoder 25 Minuscule slot 26a, 2Gb Non-contact section 27 Bounced section 28 Slit 29 Sealing material 30 Concave section 31 Convex section 32 Counter hole
    权利要求:
    Claims (2)
    [0001]
    1. Bearing bearing unit with encoder (1) to support a wheel, comprising: an outer ring (7) that has double row outer ring ducts (9) around their inner circumferential surface, and which it is supported by and attached to a suspension during use so that it does not rotate; a wheel axle (6) that has double row inner ring ducts (9) around the circumferential outer surface of the same, and with a wheel supported by and fixed to it during use, which rotates together with the wheel; rolling elements (8) which are provided so that there are a plurality of rolling elements (8) located in each row between the outer ring ducts and the inner ring ducts and the wheel axle is supported on the inner diameter side of the outer ring (7) so as to be concentric with the outer ring (7): an encoder (1a) which is supported by and fixed to the inner end section in the axial direction of the wheel axis (6) so that it it is concentric with the wheel axis (6), with the inner surface in the axial direction of it being a detected surface (24) that has a magnetic characteristic that, alternatively, changes in the circumferential direction; and a cover (19d) which is made of a non-magnetic plate material and which comprises a cylinder section (20) extending in the axial direction, and a flat plate section (21) which is curved and extends inward in the radial direction from the inner end section in the axial direction of the cylinder section (20), and together with this cylinder section (20) it fits inside the inner end section in the axial direction of the outer ring, the flat plate section (21) faces directly towards the detected surface (24) of the encoder (1a); a non-contact section (26a) formed all the way around the inner end section in the axial direction of the cylinder section (20) of the cover (19a, 19d) so that it does not come into contact with the circumferential inner surface the outer ring (7) when the cover (19a) is fitted inside and fixed to the outer ring (7), and with the cover (19d) fitted inside the inner end section in the axial direction of the outer ring (7) , the cylinder section (20) which fits inside the inner end section in the axial direction of the outer ring (7) so that only the portion over the outer part in the axial direction more than the non-contact section ( 26a) fits inside through an interference fit, characterized by the fact that the outer surface in the axial direction of the cover (19d) which faces the inner end surface in the axial direction of the wheel axis (6) is located more internally in the radial connection than the flat plate section (21) of the cover (19d), a gap (a) between the detected surface (24) of the encoder (1a) and the outer surface in the axial direction of the flat plate section ( 21) of the cover (19d) facing the detected surface (24) of the encoder (1a) is larger than a gap (b) between the inner end surface in the axial direction of the wheel axis (6) and the surface of outer part in the axial direction of the flat plate section (21) of the cover (19d) which faces the inner end surface in the axial direction of the wheel axis (6), and the slot (b) between the inner end surface in the axial direction of the wheel axle (6) and the outer part surface in the axial direction of the flat plate section (21) of the cover (19d) which faces the inner end surface in the axial direction of the wheel axle (6 ) is larger than the gap (c) between the inner end surface in the axial direction of the wheel axle (6) and the outer part surface in the axial direction of the cover (19d) which faces the inner end surface in the axial direction of the wheel axle (6).
    [0002]
    2. Bearing bearing unit with encoder for supporting a wheel, according to claim 1, characterized by the fact that a convex section (31) is formed in the central section in the radial direction of the cover (19d), making a portion further inward in the radial direction than the flat plate section (21) of the cover (19d) to protrude inward in the axial direction, the inner diameter of the flat plate section (21) is considered 25% or more than the diameter of the cover (19d), and the angle of the conical surface of the convex section (31) that protrudes from the flat plate section (21) in the axial direction is regulated with the range of 5 ° to 90 °
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    同族专利:
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    JP2018035943A|2017-11-08|2018-03-08|Ntn株式会社|Bearing device for wheel|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-06-16| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-07-28| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/02/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2010-165014|2010-07-22|
    JP2010165014|2010-07-22|
    PCT/JP2011/052479|WO2012011297A1|2010-07-22|2011-02-07|Rolling bearing unit with encoder for supporting drive wheel|
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