• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This pulley device (1) comprises a bearing (2) including an inner ring (22) defining a central bore (10), an outer ring (24) and rolling elements (26) mounted between the inner ring and the outer ring , a pulley (3) integral in rotation with the outer ring and provided with engagement means (30) with a transmission member (32), a screw (4) comprising a head (42) and a rod (44) housed therein in the central bore of the inner ring, the screw being configured to attach the pulley device to a motor mount (100). The pulley device also comprises a first sleeve (6) arranged between the inner ring and the screw, on the motor support side. The first sleeve (6) has an inner surface that has a frustoconical portion (68) having a diameter (D68) increasing toward the screw head.
    公开号:FR3029586A1
    申请号:FR1462046
    申请日:2014-12-08
    公开日:2016-06-10
    发明作者:Mickael Cousinery；Claude Quincay
    申请人:SKF AB；
    IPC主号:
    专利说明:

    [0001] The invention relates to a pulley device. The field of the invention is that of tensioning rollers for tensioning a chain or a belt for transmitting movements, rollers, winders, idle pulleys and any other rotational transmission support means. In known manner, such a pulley device may comprise a bearing and a fixing screw. The bearing comprises an inner ring and an outer ring in relative rotation. The screw includes a head and a threaded end. The screw passes through the inner ring of the bearing, so that its threaded end enters a threaded hole in a support, for example an engine block. As far as possible, mechanical contact between the rotating elements of the bearing and the support, which may in particular be arranged in the engine compartment of a motor vehicle and subjected to frequent vibrations, should be avoided as far as possible.
    [0002] To do this, it is known to use a spacer ("spacer" in English) to axially move the bearing relative to the support. To achieve this spacer, a first approach is to integrate the spacer to the inner ring of the bearing. A disadvantage of this approach is to complicate the manufacture and assembly of pulley devices equipped with such spacers.
    [0003] According to a second approach, the spacer is a separate part of the bearing. The pulley device is then equipped with a metal sleeve which is secured to the inner ring of the bearing. A disadvantage of this approach is the weight and cost of the sleeve. In this regard, it is known, for example from DE-A-198 50 157, to provide a sleeve of plastic material which is overmolded or fitted on the inner ring of the bearing. Such a pulley device is simple and economical to manufacture. It is also known, for example from DE-A-10 200 60 19 538, to provide two reduced-size sleeves which define between them an axial interstice. When introducing the fixing screw through the sleeves, this screw is often inserted at an angle and then hits an edge of the sleeve disposed against the support. The use of both sleeves reduces the weight and cost of the pulley device, but complicates the insertion of the screw into the holder. It is to these drawbacks that the present invention more particularly intends to remedy, by proposing a new pulley device which facilitates the insertion of the screw.
    [0004] For this purpose, the invention relates to a pulley device, comprising a bearing including an inner ring defining a central bore, an outer ring and rolling elements mounted between the inner ring and the outer ring. The pulley device also comprises a pulley, integral in rotation with the outer ring and provided with engagement means with a transmission member, and a screw comprising a head and a rod housed in the central bore of the ring. internally, the screw being configured to attach the pulley device to a motor mount. The pulley device also comprises a first sleeve arranged between the inner ring and the screw, on the side of the engine support. According to the invention, the sleeve has an inner surface which has a frusto-conical portion having a diameter increasing towards the head of the screw. Thus, the invention makes it possible to prevent the screw from jamming against the second sleeve when it is introduced through the device. The shank of the screw passes into the internal central bore of the inner ring, then through the frustoconical portion of the sleeve without the risk of striking one of its edges, before entering the support. In addition, providing a frustoconical portion on the sleeve reduces the weight and therefore the cost of the device. According to advantageous but non-compulsory aspects of the invention, such a pulley device may incorporate one or more of the following features, taken in any technically permissible combination: The pulley device further comprises a second sleeve arranged between the inner ring and the screw. - An axial gap is defined between the first sleeve and the second sleeve arranged in the bore of the inner ring, said axial gap being greater than or equal to half the length of said bore. - The second sleeve has an inner surface which has a frustoconical portion having a diameter increasing towards the first sleeve. - The first and second sleeves have an identical construction. - The inner surface of at least one of the first and second sleeves 30 has a frustoconical portion having an increasing diameter and opening opposite the other sleeve. - At least one of the first and second sleeves has a cylindrical outer surface provided with at least one rib disposed in abutment against the inner ring of the bearing. 3029586 3 - The minimum diameter of the inner surface of the first sleeve is smaller than the diameter of the screw shank. - The inner surface of the first sleeve is frustoconical over more than 80% of its axial length. 5 - The frustoconical portion of the first sleeve extends over its entire inner surface. - At least one of the first and second sleeves is provided with an outer bevel, at one end facing the other sleeve. - The first sleeve is mounted on the inner ring by overmolding, gluing or pressing. - The first sleeve is made of synthetic material, in particular polyamide reinforced with glass fibers. The invention will be better understood and other advantages thereof will appear more clearly in the light of the description which follows, given solely by way of nonlimiting example and with reference to the appended drawings, in which: Figure 1 is an elevational view of a pulley device according to a first embodiment of the invention, comprising a pulley, a bearing, two sleeves and a fixing screw, which is not shown for a purpose. simplification; FIG. 2 is a section on the plane II-II in FIG. 1 of the pulley device of FIG. 1 when it is mounted on a motor support by means of its screw, the second sleeve being interposed between the screw head and the bearing, the first sleeve being interposed between the bearing and the engine support; FIG. 3 is a perspective view of the second sleeve shown in FIG. 2; Figure 4 is an elevational view of the second sleeve along arrow IV in Figure 3; - Figure 5 is a section of the second sleeve along the plane V-V in Figure 4; Figure 6 is a perspective view of the first sleeve shown in Figures 1 and 2; Figure 7 is an elevational view of the first sleeve along arrow VII in Figure 6; - Figure 8 is a section of the first sleeve along the plane VIII-VIII in Figure 7; FIG. 9 is a view similar to FIG. 2 of a pulley device according to a second embodiment of the invention, and FIG. 10 is a view similar to FIG. pulley according to a third embodiment of the invention. In Figures 1 and 2 is shown a pulley device 1 according to the invention, the type tensioner roller.
    [0005] The pulley device 1 is intended to be mounted on a motor support 100, partially shown in FIG. 2. This pulley device 1 comprises a ball bearing 2, a pulley 3, a fixing screw 4, as well as two sleeves. 5 and 6. X1 is a central axis of the pulley device 1. The pulley device 1 defines a central bore 10 centered on the axis X1. The length of the bore 10 measured parallel to the axis X1 is denoted L. In the following, the terms "axial" and "radial" are defined in relation to the axis X1. Thus, an axial direction is parallel to the axis X1 and a radial direction is perpendicular to the axis X1 and secant with this axis. An axial surface is perpendicular to an axial direction and a radial surface is perpendicular to a radial direction.
    [0006] The ball bearing 2 includes an inner ring 22, an outer ring 24 and rolling elements 26 mounted between the inner ring 22 and the outer ring 24. In the non-limiting example of Figure 2, the rolling elements 26 are made up by two rows of balls 26. In a variant, the rolling elements 26 may be rollers or needles.
    [0007] The pulley 3 is fixed on the outer ring 24, for example by gluing, overmolding, tight fitting or crimping. The pulley 3 is integral in rotation, about the axis X1, of the outer ring 24. The pulley 3 is provided with an outer peripheral surface 30, that is to say the surface of the pulley 3 oriented radially to the outside relative to the axis X1. This surface 30 is designed to support a belt 32, 25 shown in phantom in FIG. 2. The surface 30 forms means for engaging the pulley 3 with the belt 32, which forms a torque transmission member. In place of the belt 32, the device 1 can receive a chain mounted around the surface 30, whose geometry is then adapted. The opposite annular surfaces of the pulley 3, which are parallel to each other and perpendicular to the axis X 1, are respectively denoted by 34 and 36, the surface 36 being turned towards the motor support 100. The fastening screw 4 is received in FIG. Bore 10 of the device 1. The screw 4 comprises a head 42 and a rod 44, which extends from the head 42 to a threaded end 46. D44 denotes the constant diameter of the rod 44. We also note X4 a longitudinal axis of the screw 4, which is superimposed on the axis X1 when the screw 4 is received in the bore 10.
    [0008] The pulley device 1 comprises a first sleeve 6 and a second sleeve 5 which delimit the bore 10 with the inner ring 22. The sleeves 5 and 6 are made of synthetic material, for example made of glass fiber reinforced polyamide. The sleeves 5 and 6 are mounted on the inner ring 22 by overmoulding, gluing or pressing. The second sleeve 5, shown in detail in FIGS. 3 to 5, is arranged radially between the inner ring 22 and the screw 4 on the side of its head 42. In practice, the sleeve 5 is intended to support the head 42 of the screw 4 when it is tightened in a corresponding tapping 102 of the motor support 100.
    [0009] The sleeve 5 is centered on an axis X5 which coincides with the axes X1 and X4 in the mounted configuration of the pulley device 1. L5 is denoted by the axial length of the sleeve 5. The sleeve 5 comprises an internal axial portion 52, which is disposed radially between the inner ring 22 and the rod 44 of the screw 4, and an outer axial portion 15 which is disposed axially between the inner ring 22 and the head 42 of the screw 4. The portion 52 has a cylindrical outer surface 520 , in order to come into contact with the inner ring 22. In the example of FIGS. 4 and 5, the surface 520 is provided with four ribs 55 intended to bear against the inner ring 22 of the bearing 2. Alternatively, the surface 520 may be provided with a different number of ribs 55.
    [0010] When the portion 52 of the sleeve 5 is introduced into the inner ring 22, the ribs 55 exert a holding force on the inner ring 22. The portion 54 has a radial and external cylindrical surface 540, facing the pulley 3. The sleeve 5 further comprises an inner radial surface 500 which, in assembled configuration, is oriented towards the axis X1 and the screw 4. The surface 500 is frustoconical over most of its length L5. The surface 500 comprises a cylindrical portion 57, in contact with the rod 44 in the mounted configuration of the pulley device 1, and a frustoconical portion 58. The frustoconical portion 58 has a diameter D58 which increases towards the first sleeve 6. Note D52 the maximum internal diameter of the sleeve 5, measured on the side of the portion 52, and D54 also note the minimum internal diameter of the sleeve 5, measured on the side of the portion 54. The diameter D52 is strictly greater than the diameter D54. In particular, the diameter D54 is the diameter of the cylindrical portion 57. Before inserting the rod 44 of the screw 4 into the bore 10, the diameter D54 is slightly smaller than the diameter D44 of the rod 44 of the screw 4, in such a way that when the screw 4 is received in the bore 10 of the pulley device 1, the sleeve 5, in particular its cylindrical portion 57, is expanded radially and exerts a retaining force on the screw 4. The portion 52 of the sleeve 5 has an end 53, which is oriented towards the first sleeve 6 and has an annular surface 530 perpendicular to the axis X5.
    [0011] The end 53 of the sleeve 5 is provided with a chamfer 56 formed at the junction between the surfaces 520 and 530. The chamfer 56 is provided to facilitate the mounting of the sleeve 5 in the inner ring 22 of the bearing 2. The frustoconical portion 58 extends from the annular surface 530 over more than 80% of the length L5 of the sleeve 5. In practice, the portion 58 extends over more than 90% of the length L5. According to a variant not shown of the invention, the frustoconical portion 58 may extend over the entire length L5. In this case, the surface 500 does not comprise a cylindrical portion. The first sleeve 6, shown in detail in FIGS. 6 to 8, is arranged radially between the inner ring 22 and the screw 4 on the side of the engine support 100. In practice, the sleeve 6 is designed to receive the engine support 100 in support. when the threaded end of the screw 4 is clamped in the corresponding tapping 102 of the engine support. The sleeve 6 is centered on an axis X6 which coincides with the axes X1, X4 and X5 in the mounted configuration of the device 1. L6 is denoted by the axial length of the sleeve 6. The sleeve 6 comprises an internal axial portion 62, which is disposed radially between the inner ring 22 and the rod 44 of the screw 4, and an outer axial portion 64, which is disposed axially between the inner ring 22 and the motor support 100. The portion 62 has a cylindrical outer surface 620 provided to come in the contact with the inner ring 22. In the example of FIGS. 6 and 7, the surface 620 is provided with four ribs 65 intended to bear against the inner ring 22 of the bearing 2. Alternatively, the surface 620 may be provided with a different number of the ribs 65. When the portion 62 of the sleeve 6 is inserted into the inner ring 22, the ribs 65, such as the ribs 55 of the sleeve 5, exert a holding force on the inner ring 22. portion 64 includes a radial and outer cylindrical surface 640, facing the pulley 3. The sleeve 6 further comprises an inner radial surface 600 which, in assembled configuration, is oriented towards the axis X1 and the screw 4. The surface 600 is frustoconical on the essential of its length L6. The surface 600 comprises a cylindrical portion 67, bearing on the rod 44 in the mounted configuration of the pulley device 1, and a frustoconical portion 68. The frustoconical portion 68 has a diameter D68 which increases towards the second sleeve 5. D62 denotes the maximum internal diameter of the sleeve 6, measured on the side of the portion 52, and D64 also denotes the minimum internal diameter of the sleeve 6, measured on the side of the portion 64. The diameter D62 is strictly greater than the diameter D64 . In particular, the diameter D64 is the diameter of the cylindrical portion 67. Before insertion of the rod 44 of the screw 4 into the bore 10, the diameter D54 is slightly smaller than the diameter D44 of the rod 44 of the screw 4, in such a way that when the screw 4 is received in the bore 10 of the pulley device 1, the sleeve 6, in particular the cylindrical portion 67, is expanded radially and exerts a retention force on the screw 4. The portion 62 of the sleeve 6 has an end 63, which faces the second sleeve 5 and has an annular surface 630 perpendicular to the axis X6. The end 63 of the sleeve 6 is provided with a chamfer 66 formed at the junction between the surfaces 620 and 630. The chamfer 66, like the chamfer 56 of the second sleeve 15 5, is provided to facilitate the mounting of the sleeve 6 in the internal ring 22 of the bearing 2. The frustoconical portion 68 extends, from the annular surface 630, over more than 80% of the length L6 of the sleeve 6. In practice, the portion 68 extends over more than 90% length L6. According to a variant not shown of the invention, the frustoconical portion 68 may extend over the entire length L6. In this case, the surface 600 does not comprise a cylindrical portion. As shown in FIG. 2, an axial gap E is defined parallel to the axis X1 between the surface 530 of the second sleeve 5 and the surface 630 of the first sleeve 6. The length of the distance E measured parallel to X1 axis. The length e is greater than or equal to half the length L of the bore 10. At this gap E, the inner ring 22 directly defines the bore 10 radially to the axis X1. This allows a significant reduction in the weight of the pulley device 1. In addition, thanks to the frustoconical portion of the surface 600, the insertion of the screw 4 is facilitated since the end 46 of the screw 4 does not abut against a junction of the surfaces 600 and 630. The frustoconical character of the surface 58 also facilitates the insertion of the rod 44 of the screw into the bore 10 by allowing an angular clearance between the parts 4 and 5, at the beginning of this insertion. Other embodiments of the invention are described hereinafter with reference to FIGS. 9 and 10. In these embodiments, the constituent elements of the pulley device 1 are comparable to those of the first embodiment described above. and, in a simplification purpose, bear the same numerical references. Only the differences with the first embodiment are described below. According to the second embodiment, shown in FIG. 9, the second sleeve 5 and the first sleeve 6 have an identical construction, in practice the same as that of the sleeve 5 of the first embodiment. This reduces the manufacturing costs of parts 5 and 6. According to the third embodiment, shown in Figure 10, the sleeves 5 and 6 have an identical construction and have internal radial surfaces 500 and 600 composed of three portions. In particular, the surface 500 of the sleeve 5 has a cylindrical portion 57 surrounded axially by two frustoconical portions 58 and 59, while the surface 600 of the sleeve 6 has a cylindrical portion 67 surrounded axially by two frustoconical portions 68 and 69. Of these, the first portions 58 and 68 have a diameter, respectively D58 and D68, increasing and opening towards the other sleeve 5 or 6. On the contrary, the second frustoconical portions 59 and 69 have a diameter, respectively D59 and D69, crescent and opening opposite the other sleeve 5 or 6. According to a variant not shown in the figures, the sleeve 6 is as described above, while the sleeve 5 has no frustoconical portion and its surface 500 is cylindrical throughout its length L5.
    [0012] According to another variant not shown in the figures, the frustoconical portions 58 and 68 extend over all the inner surfaces 500 and 600 of the sleeves 5 and 6. Moreover, the pulley device 1 may be shaped differently from FIGS. 10 without departing from the scope of the invention. In addition, the technical features of the various embodiments and variants mentioned above may be, in whole or for some of them, combined with one another. Thus, the device 1 can be adapted in terms of cost, functionality and performance.
    权利要求:
    Claims (13)
    [0001]
    1. A pulley device (1), comprising: a bearing (2) including an inner ring (22) defining a central bore (10), an outer ring (24) and rolling elements (26) mounted between the inner ring and the outer ring; a pulley (3) integral in rotation with the outer ring and provided with engagement means (30) with a transmission member (32); a screw (4) comprising a head (42) and a rod (44) housed in the central bore of the inner ring, the screw being configured to attach the pulley device to a motor mount (100); a first sleeve (6) arranged between the inner ring and the screw, on the motor support side; characterized in that the first sleeve (6) has an inner surface (600) having a frustoconical portion (68) having a diameter (D68) increasing towards the head (42) of the screw (4).
    [0002]
    2.- Device according to claim 1, characterized in that it comprises a second sleeve (5) arranged between the inner ring (22) and the screw (4), the side of the head (42) of the screw.
    [0003]
    3.- Device according to claim 2, characterized in that an axial gap (E) is defined between the first sleeve (6) and the second sleeve (5) arranged in the bore (10) of the inner ring (22). ), said axial gap being of length (e) greater than or equal to half the length (L) of said bore.
    [0004]
    4.- Device according to one of claims 2 and 3, characterized in that the second sleeve (5) has an inner surface (500) which has a frustoconical portion (58) having a diameter (D58) increasing towards the first sleeve (6).
    [0005]
    5.- Device according to one of claims 2 to 4, characterized in that the first and second sleeves (5,
    [0006]
    6) have an identical construction. 6.- Device according to one of claims 2 to 5, characterized in that the inner surface (500, 600) of at least one of the first and second sleeves (5, 6) has a frustoconical portion (59, 69) having a diameter (D59, D69) increasing and opening opposite the other sleeve.
    [0007]
    7.- Device according to one of the preceding claims, characterized in that at least one of the first and second sleeves (5, 6) has a cylindrical outer surface (520, 620) provided with at least one rib (55 , 65) disposed in abutment against the inner ring (22) of the bearing (2).
    [0008]
    8.- Device according to one of the preceding claims, characterized in that the inner surface (600) of the first sleeve (6) is frustoconical over more than 80% of its axial length (L6).
    [0009]
    9.- Device according to one of the preceding claims, characterized in that the frustoconical portion (68) of the first sleeve (6) extends over its entire inner surface (600).
    [0010]
    10.- Device according to one of the preceding claims, characterized in that the minimum diameter (D64) of the inner surface (600) of the first sleeve (6) is less than the diameter (D44) of the rod (44) of the screw (4). 20
    [0011]
    11.- Device according to one of the preceding claims, characterized in that at least one of the first and second sleeves (5, 6) is provided with an outer chamfer (56, 66) at one end (53, 63 ) facing the other sleeve. 25
    [0012]
    12.- Device according to one of the preceding claims, characterized in that the first sleeve (6) is mounted on the inner ring (22) by overmoulding, gluing or pressing.
    [0013]
    13.- Device according to one of the preceding claims, characterized in that the first sleeve (6) is of synthetic material, in particular glass fiber reinforced polyamide.
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    DE102007039136A1|2007-08-18|2009-02-19|Schaeffler Kg|Tensioning roller for traction drive such as belt drive of internal combustion engine, has traction mechanism connected with drive shaft and output shaft, and radial outer guide pulley|
    CN203272722U|2013-05-06|2013-11-06|东风汽车公司|Dustproof and waterproof assembly for idle wheel|FR3090060A1|2018-12-18|2020-06-19|Skf|Pulley device|
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    FR3099219A1|2019-07-25|2021-01-29|Skf|Pulley device|US1162145A|1915-01-19|1915-11-30|Peter Dosch|Caster or wheel.|
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    JP3680083B2|2003-09-26|2005-08-10|バンドー化学株式会社|Transmission belt pulley and belt transmission device|
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    FR2889278B1|2005-07-27|2008-09-12|Skf Ab|ROLLER DEVICE FOR BELT|
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    DE102006019538A1|2006-04-27|2007-10-31|Schaeffler Kg|Belt roll e.g. tension pulley, for traction mechanism drive, has distance piece with distance discs attached to inner bearing ring of roller bearing, where discs comprise centrical boring for accommodation of screw connection|
    FR2992707B1|2012-06-29|2015-01-16|Skf Ab|TENSION ROLLER AND TENSIONER FOR BELT TRANSMISSION OF AN INTERNAL COMBUSTION ENGINE|
    FR3013093B1|2013-11-14|2015-12-11|Skf Ab|PULLEY DEVICE FOR CHAIN OR BELT AND MOTOR VEHICLE EQUIPPED WITH SUCH A DEVICE|FR3013093B1|2013-11-14|2015-12-11|Skf Ab|PULLEY DEVICE FOR CHAIN OR BELT AND MOTOR VEHICLE EQUIPPED WITH SUCH A DEVICE|
    FR3039863B1|2015-08-06|2018-03-02|Skf Ab|PULLEY DEVICE FOR TILT ROLLER OR ROLLER|
    CN105972170B|2016-06-13|2019-10-29|北京理工大学|A kind of rope drive pulley of rope driving ectoskeleton mechanical arm|
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    FR3079583B1|2018-04-03|2020-03-06|Aktiebolaget Skf|PULLEY DEVICE FOR TENSIONER OR ROLLER|
    法律状态:
    2015-12-29| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-10| PLSC| Publication of the preliminary search report|Effective date: 20160610 |
    2016-12-29| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-26| PLFP| Fee payment|Year of fee payment: 4 |
    2019-12-26| PLFP| Fee payment|Year of fee payment: 6 |
    2021-09-10| ST| Notification of lapse|Effective date: 20210806 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1462046A|FR3029586B1|2014-12-08|2014-12-08|PULLEY DEVICE|
    FR1462046|2014-12-08|FR1462046A| FR3029586B1|2014-12-08|2014-12-08|PULLEY DEVICE|
    CN201510883263.6A| CN105673813B|2014-12-08|2015-12-04|Pulley gear|
    US14/960,503| US9810308B2|2014-12-08|2015-12-07|Pulley device|
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