• 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:
    The electromechanical ram comprises a casing 12, an actuating rod 14 mounted longitudinally movable with respect to the casing, an electric motor 16 provided with a stator 20 and a rotary rotor shaft 24, and a mechanism 18 for transforming the casing. a rotational movement of the rotor shaft in a linear translational movement of the actuating rod. The jack comprises at least one rolling bearing 30 for rotating the rotor shaft relative to the housing and comprising at least one row of rolling elements 30b. An inner race 54 for said row of rolling elements 30b of said bearing is formed directly on the rotor shaft 24.
    公开号:FR3041830A1
    申请号:FR1559018
    申请日:2015-09-24
    公开日:2017-03-31
    发明作者:Benoit Laurent；Emmanuel Eyraud
    申请人:SKF AB；
    IPC主号:
    专利说明:

    Electromechanical cylinder
    The present invention relates to the field of actuators or electromechanical actuators.
    More particularly, the invention relates to the field of compact electromechanical cylinders used to provide high performance in a small footprint.
    An electromechanical actuator generally comprises a casing, an actuating rod mounted longitudinally with respect to the casing, an electric motor and a mechanism, for example of the ball screw type, for converting the rotational movement of the motor rotor into translational motion. linear actuating rod.
    To guide in rotation and support the rotor of the electric motor, it is generally mounted at the front of the housing a pair of rolling bearings mounted axially in abutment against each other.
    Conventionally, this axial stack of bearings is mounted on one side against a radial abutment formed on the rotor shaft, and is preloaded axially by a self-locking tightening nut disposed on the other side.
    This solution has the particular disadvantages of having a large axial size and require a large number of operations to achieve the mounting and fixing of rolling bearings within the cylinder housing.
    The present invention aims to remedy these disadvantages.
    More particularly, the present invention aims at providing an electromechanical jack in which, for the same axial space, the load capacity is increased.
    In one embodiment, an electromechanical ram comprises a housing, an actuator rod mounted longitudinally movable with respect to the housing, an electric motor provided with a stator and a rotary rotor shaft, and a conversion mechanism. a rotational movement of the rotor shaft in a linear translational movement of the actuating rod.
    The jack also comprises at least one rolling bearing for guiding the rotor shaft in rotation and comprising at least one row of rolling elements. An inner race for said row of rolling elements is formed directly on the rotor shaft.
    The rolling elements of said bearing roll directly on the rotor shaft of the electric motor supporting the magnets. This bearing is therefore devoid of inner ring interposed radially between the rolling elements and the rotor shaft.
    Thus, unlike the state of the prior art, it is not necessary to provide specific means to ensure the axial locking of this or these bearings on the rotor shaft. It is therefore possible to mount an electric motor of greater length inside the housing. This increases the load capacity of the cylinder for the same overall axial size. Conversely, for the same load capacity, it is possible to reduce the overall axial dimension of the jack.
    Preferably, said inner race is formed on an outer surface of the rotor shaft.
    Said rolling bearing may comprise an outer ring mounted in a bore of the housing and provided with an outer race for said row of rolling elements of the bearing.
    In a preferred embodiment, the jack comprises at least two rolling bearings mounted axially in contact with each other and each comprising a row of rolling elements, an inner race for each of said rows of rolling elements. being formed directly on the rotor shaft. The rows of rolling elements of the bearings are arranged in X.
    In one embodiment, the bearing or bearings may be of the angular contact ball type.
    Preferably, the conversion mechanism is a roller screw or ball screw mechanism.
    In an alternative embodiment, the mechanism comprises a screw secured to the actuating rod and provided with an external thread, and a plurality of longitudinal rollers engaged with the external thread of the screw and an internal thread of the thread shaft. rotor.
    In another variant, the roller screw mechanism comprises a screw provided with an external thread, a nut disposed around the screw, comprising an internal thread and secured to the actuating rod, and a plurality of longitudinal rollers in mesh. with the external and internal threads of the screw and the nut. Alternatively, replacing the rollers, balls can be engaged inside the outer and inner threads of the screw and the nut.
    The present invention will be better understood on studying the detailed description of embodiments, taken as non-limiting examples and illustrated by the appended drawings, in which FIGS. 1 to 3 are axial sectional views of electromechanical cylinders. according to first, second and third embodiments.
    In Figure 1, the electromechanical actuator, referenced 10 as a whole, extends along a longitudinal axis X-X 'assumed horizontal. The jack 10 comprises a casing 12, an axially movable operating rod 14 coaxial with the X-X 'axis, and an electric motor 16 and a roller screw mechanism 18 arranged inside the casing 12. The mechanism 18 is interposed radially between the electric motor 16 and the actuating rod 14.
    The mechanism 18 enables the transformation of a rotational movement of the electric motor 16 into a linear translational movement of the actuating rod 14 along the axis X-X '. The electric motor 16 and the mechanism 18 are fully housed inside the housing 12. The actuating rod 14 extends through the housing 12 and axially projecting outwardly.
    In the exemplary embodiment illustrated, the casing 12 comprises a tubular main body 12a and front 12b and rear 12c flanges each mounted at one end of said body. The actuating rod 14 extends through the front flange 12b.
    The electric motor 16 comprises a stator 20 fixed on the housing 12 and a rotor 22. The stator 20 is fixed on a bore 28 of the housing. The rotor 22 is provided with a tubular rotor shaft 24 and a plurality of permanent magnets 26 supported by said shaft. The rotor shaft 24 extends axially on either side of the stator 20. The electric motor 16 may be of the brushless type.
    To guide in rotation and support the rotor shaft 24, the cylinder 10 further comprises two bearings 30, 32 with a front bearing and a bearing 34 with a rear bearing. As will be described in more detail later, the bearings 30, 32 are designed so as to limit the overall axial dimension of the jack 10.
    The rear bearing bearing 34 is interposed radially between the rotor shaft 24 and a rear support 36 fixed in the bore 28 of the housing. The rolling bearing 34 is mounted on an outer surface 24a of the rotor shaft and in a bore of the rear support 36. Inside the rear flange 12c of the housing are also arranged sensor and encoder means for knowing the angular position of the rotor 22 of the electric motor.
    In the exemplary embodiment illustrated, the roller screw mechanism 18 is of the inverted satellite roller screw type. The mechanism 18 comprises a screw 40, which is coaxial with the actuating rod 14, fixed to said rod and provided with an external thread (not referenced), and a plurality of longitudinal rollers 42 arranged radially between the screw and the rotor shaft 24. The rotor shaft 24 has a tubular shape. The rotor shaft 24, coaxial with the screw 40, comprises an internal thread (not referenced) whose internal diameter is greater than the external diameter of the thread of the screw 40.
    The rollers 42 are identical to each other and regularly distributed around the screw 40. Each roll 42 extends along an axis parallel to the axis of the screw and comprises an external thread (not referenced) engaged with the external thread. of the screw 40 and the internal thread of the rotor shaft 24. In a manner known per se, each roll 42 comprises, at each end, an external toothing in engagement with a synchronization toothing of the screw 40, and a trunnion extending axially outwards from the toothing and housed in a housing. recess of one of the spacing rings 44, 46 mounted on said screw.
    The actuating rod 14 is integral with the screw 40 of the roller screw mechanism. The rotation of the rotor shaft 24 of the electric motor is converted into a translation of the screw 40 and the actuating rod 14 along the axis X-X '.
    As indicated above, the rolling bearings 30, 32 provide rotational guidance of the rotor shaft 24 of the electric motor. Each bearing 30, 32 comprises an outer ring 30a, 32a and a plurality of rolling elements 30b, 32b, here made in the form of balls, arranged radially between said inner ring and the rotor shaft 24. Each bearing 30, 32 also comprises a cage (not shown) for maintaining the regular circumferential spacing of the rolling elements.
    The outer ring 30a, 32a of each bearing is fixed in the bore 28 of the housing. An outer raceway 50, 52 is formed on the bore of each ring and has in cross section a concave inner profile adapted to the rolling elements 30b, 32b, said raceway being directed radially inwards.
    An inner race 54, 56 is formed directly on the outer surface 24a of the rotor shaft for the rolling element row 30b, 32b of each bearing 30, 32. The outer surface 24a of the rotor shaft defines tracks for rolling elements. Each raceway 54, 56 has in cross section a concave internal profile adapted to the rolling elements 30b, 32b, said raceway being directed radially outwardly.
    The raceways 54, 56 are formed on a protrusion 58 radial of the shaft 24 of the rotor. The protrusion 58 extends radially outwardly from the outer surface 24a of the rotor shaft and is located axially between the two rows of rolling elements 30b, 32b. The protrusion 58 is integral with the rotor shaft 24, i.e. integral. In the exemplary embodiment illustrated, the rolling elements 30b, 32b are arranged in X.
    The rolling elements 30b, 32b are in direct contact with the outer surface 24a of the rotor shaft. Each bearing 30, 32 is therefore devoid of an inner ring interposed radially between the rotor shaft 24 and the rolling elements 30b, 32b.
    Thus, contrary to the state of the prior art, the provision of specific means for axially stopping the bearings 30, 32 on the rotor shaft 24 is not necessary. It is therefore no longer mandatory to provide on the rotor shaft 24 an axial space specifically dedicated to the assembly of such means. Thus, it becomes possible to mount an electric motor 16 of greater length and thus increase the load capacity of the cylinder 10, and for the same overall axial space. The exemplary embodiment illustrated in FIG. 2, in which the identical elements bear the same references, differs from the preceding example mainly in that the mechanism 18 is of the satellite roller screw type. The mechanism 18 comprises a nut 60 mounted inside the shaft 24 of the tubular rotor of the electric motor, and on which is fixed the rod 14 of actuation. In this example, the actuating rod 14 is thus integral with the nut 60. The nut 60 is mounted coaxially with the screw 40 and comprises an internal thread (not referenced) whose inner diameter is greater than the outer diameter of the thread. of the screw. The rollers 42 are here arranged radially between the nut 60 and the screw 40 and engaged with the inner and outer threads of said nut and said screw.
    The screw 40 of the mechanism is here coupled to the rotor shaft 24 of the electric motor. The screw 40 extends inside the rod 14 actuating tubular form. To ensure the rotational guidance of the screw 40, the cylinder 10 comprises a housing 62 equipped with a bearing 64 and radially interposed between the screw and the bore of the actuating rod 14.
    In this embodiment, the rotation of the screw 40 of the mechanism 18, which is integral with the rotor shaft 24, is converted into a translation of the nut 60 and the actuating rod 14 along the X-X 'axis.
    The previous examples of embodiment deal with a jack equipped with a mechanism 18 of roller screw type. Alternatively, the jack 10 may comprise a ball screw mechanism as shown in Figure 3, in which the identical elements bear the same references.
    Compared to the embodiment previously described, the jack 10 differs only in that the mechanism 18 comprises a plurality of balls 66 engaged inside the external and internal threads of the screw 40 and the nut 60 which are specifically provided for this purpose. Ball recirculation means (not visible) are also provided on the nut 60. The invention has been illustrated on the basis of a jack comprising bearings 30, 32 of the angular contact ball type. Alternatively, it may be possible to provide other types of rolling elements, for example rollers.
    In the exemplary embodiments illustrated, the rolling elements are arranged in X. Alternatively, it could be possible to provide an O arrangement. However, for mounting reasons, the inner raceway of only one of the two bearings is formed. directly on the rotor shaft in this case, the other bearing being equipped with a clean inner ring. The invention has been illustrated on the basis of a jack comprising bearings mounted axially in abutment against each other and each comprising a single row of rolling elements. As a variant, it could for example be possible to provide a single bearing comprising at least two rows of rolling elements, or a greater number of axially stacked bearings comprising one or more rows of rolling elements.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    An electromechanical actuator comprising a housing (12), an actuating rod (14) movably mounted longitudinally with respect to the housing, an electric motor (16) provided with a stator (20) and a rotor shaft (24). ) rotatable, a mechanism (18) for transforming a rotational movement of the rotor shaft into a linear translational movement of the actuating rod, and at least one rolling bearing (30) for rotating the guide. rotor shaft relative to the housing and comprising at least one row of rolling elements (30b), characterized in that an inner raceway (54) for said rolling element row (30b) of said bearing is formed directly on the rotor shaft (24).
    [2" id="c-fr-0002]
    The actuator of claim 1, wherein said inner raceway (54) is formed on an outer surface (24a) of the rotor shaft.
    [3" id="c-fr-0003]
    3. A cylinder according to claim 1 or 2, wherein said bearing bearing (30) comprises an outer ring (30a) mounted in a bore of the housing (12) and provided with an outer race (50) for said row. of rolling elements (30b) of the bearing.
    [4" id="c-fr-0004]
    4. A cylinder according to any one of the preceding claims, comprising at least two rolling bearings (30, 32) mounted axially in contact with each other and each comprising a row of rolling elements (30b, 32b), an inner race (54, 56) for each of said rows of rolling elements being formed directly on the rotor shaft (24).
    [5" id="c-fr-0005]
    5. A cylinder according to claim 4, wherein the rows of rolling elements (30b, 32b) of the bearings are arranged in X.
    [6" id="c-fr-0006]
    6. A cylinder according to any one of the preceding claims, wherein said bearing is an angular contact ball bearing.
    [7" id="c-fr-0007]
    7. A cylinder according to any one of the preceding claims, wherein the mechanism (18) of transformation is a screw mechanism with rollers or balls.
    [8" id="c-fr-0008]
    A jack according to claim 7, wherein the roller screw mechanism (18) comprises a screw (40) integral with the actuating rod (14) and provided with an external thread, and a plurality of rollers (42). ) longitudinally engaged with the external thread of the screw and an internal thread of the rotor shaft (24).
    [9" id="c-fr-0009]
    9. A cylinder according to claim 7, wherein the mechanism (18) of roller screw comprises a screw (40) provided with an external thread, a nut (60) disposed around the screw, comprising an internal thread and secured to the actuating rod (14), and a plurality of longitudinal rollers (42) engaging said outer and inner threads.
    [10" id="c-fr-0010]
    10. A cylinder according to claim 7, wherein the mechanism (18) of ball screw comprises a screw (40) provided with an external thread, a nut (60) disposed around the screw, comprising an internal thread and secured to the actuating rod, and a plurality of balls (66) engaged within said outer and inner threads.
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3041830A1|2017-03-31|ELECTROMECHANICAL VERIN
    EP2947348B1|2021-03-03|Pre-charging device for a rotatably guided roller screw mechanism
    EP1452753A1|2004-09-01|Roller bearing with integrated sensor
    US20060240932A1|2006-10-26|Motor-incorporated hypocycloid-type speed reducer
    FR2667917A1|1992-04-17|LINEAR ACTUATOR WITH LOW DIMENSIONS.
    WO1998034037A1|1998-08-06|Rolling and bearing comprising a temperature compensating insert
    EP0402240A1|1990-12-12|Live ring with integrated motor
    FR2996888A1|2014-04-18|BEARING BEARING HAS AT LEAST TWO ROWS OF ROLLING ELEMENTS, IN PARTICULAR FOR TUNNELIER
    FR2999674A1|2014-06-20|SYSTEM COMPRISING A ROLLER SCREW
    FR2871128A1|2005-12-09|Steering column for motor vehicle, has tubular shaft with two portions rotatably mounted in tubular housing by respective antifriction bearings, where each bearing has inner ring which is of massive type
    FR2972041A1|2012-08-31|Screw and nut type linear actuator for dynamic adjustment of headlight of automobile, has support whose base and side walls are integrated and form single piece that is made only or mainly from stamped metal sheet
    FR2846784A1|2004-05-07|BEARING ASSEMBLY FOR ROTATING MOUNTING OF A ROTATING ANODE OF AN X-RAY EMISSION DEVICE AND X-RAY EMISSION DEVICE PROVIDED WITH SUCH AN ASSEMBLY.
    FR3030661A1|2016-06-24|ELASTIC PISTON FOR ELECTRIC BRAKE ACTUATOR, DRUM BRAKE OR DISC BRAKE AND MOUNTING METHOD
    FR2915032A1|2008-10-17|ANTI-FLAGING ROTATING MACHINE
    EP3754225A1|2020-12-23|Electromechanical actuator with integrated force sensor
    FR3001510A1|2014-08-01|CAGE FOR BEARING, IN PARTICULAR FOR THE ELECTRIC DIRECTION BEARING OF A MOTOR VEHICLE
    EP3140562B1|2020-07-01|Ball screw electromechanical actuator for a clutch
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    FR2970755A1|2012-07-27|BELT TENSION ROLLER DEVICE AND ASSOCIATED ASSEMBLY METHOD
    WO2006111657A1|2006-10-26|Alternator comprising an antifriction bearing having a fastening collar
    FR3031564A1|2016-07-15|MECHANISM FOR TRANSFORMING A ROTATION MOVEMENT TO A TRANSLATION MOVEMENT BY A SCREW AND NUT-TYPE HELICOIDAL CONNECTION
    FR3097912A1|2021-01-01|ROTATING ELECTRIC MACHINE EQUIPPED WITH A BEARING PRE-TENSIONING BODY
    JP2019210996A|2019-12-12|Ball screw
    FR2921140A1|2009-03-20|BEARING BEARING DEVICE, ESPECIALLY FOR MEDICAL APPARATUS
    EP1473570A1|2004-11-03|Rolling bearing with integrated speed sensing device
    同族专利:
    公开号 | 公开日
    FR3041830B1|2019-04-26|
    US20170089436A1|2017-03-30|
    US10677329B2|2020-06-09|
    IT201600093632A1|2018-03-19|
    DE102016218309A1|2017-03-30|
    CN106936260A|2017-07-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1999002883A1|1997-07-10|1999-01-21|Skf Engineering & Research Centre B.V.|Electric actuator and calliper brake comprising such actuator|
    DE202014103629U1|2014-08-05|2014-09-18|Perma Gear Gmbh Magnetische Antriebselemente|pusher|
    US6098479A|1997-08-23|2000-08-08|Hoermansdoerfer; Gerd|Linear actuator and preferred application|
    AU2154302A|2000-11-07|2002-05-21|Luk Lamellen & Kupplungsbau|Electromotor actuator for a gearbox|
    US6865963B2|2001-05-16|2005-03-15|Sumitomo Heavy Industries, Ltd.|Apparatus and method for lubricating feed mechanism of forming machine|
    DE102004054037B3|2004-11-05|2006-10-05|Stabilus Gmbh|adjustment|
    US20090100957A1|2007-10-23|2009-04-23|Honeywell International, Inc.|Rotor assemblies having shafts with integral bearing raceways|
    DE102008030583A1|2008-06-27|2009-12-31|Oerlikon Leybold Vacuum Gmbh|Shaft assembly for fast rotating shafts|
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    GB2508868A|2012-12-13|2014-06-18|Johnson Electric Sa|Suspension system for the rotor of a linear actuator|
    US20170067455A1|2014-02-26|2017-03-09|Techni Waterjet Pty Ltd|Linear actuator|
    US9765867B2|2014-04-23|2017-09-19|Nabtesco Corporation|Electromechanical actuator|
    CN104675946B|2014-08-27|2019-06-18|北京精密机电控制设备研究所|A kind of differential planetary roller screw|
    CN204646984U|2015-05-25|2015-09-16|镇江飞亚轴承有限责任公司|A kind of bolt type double row deep groove ball bearing|DE102016007542A1|2016-06-22|2017-12-28|Thyssenkrupp Ag|Ball screw drive of an electromechanical power steering with deflecting body for a ball return|
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    US10711871B2|2018-01-26|2020-07-14|Schaeffler Technologies AG & Co. KG|Axially compact linear actuator drive arrangement|
    EP3553342A1|2018-04-10|2019-10-16|SKF Motion Technologies AB|Actuating cylinder with load sensor|
    EP3553345A1|2018-04-10|2019-10-16|SKF Motion Technologies AB|Actuating cylinder with lubricant refilling channel|
    法律状态:
    2016-09-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-31| PLSC| Search report ready|Effective date: 20170331 |
    2017-10-02| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-23| PLFP| Fee payment|Year of fee payment: 5 |
    2021-06-11| ST| Notification of lapse|Effective date: 20210506 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1559018A|FR3041830B1|2015-09-24|2015-09-24|ELECTROMECHANICAL VERIN|
    FR1559018|2015-09-24|FR1559018A| FR3041830B1|2015-09-24|2015-09-24|ELECTROMECHANICAL VERIN|
    CN201610815659.1A| CN106936260A|2015-09-24|2016-09-09|Electromechanical driving cylinder|
    IT102016000093632A| IT201600093632A1|2015-09-24|2016-09-19|Electromechanical actuator|
    US15/272,761| US10677329B2|2015-09-24|2016-09-22|Electromechanical actuator cylinder|
    DE102016218309.5A| DE102016218309A1|2015-09-24|2016-09-23|Electromechanical cylinder|
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