• 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 invention relates to a control system of a parking lock for locking a transmission of a motor vehicle, comprising a motor (2) driving a screw rotation, and having a nut (44) engaged on the screw , rotatably locked and axially slidable by acting on a locking lever of the transmission, this control system being remarkable in that the nut (44) has a constant cross-section which is not circular, and in that the motor (2) comprises a cover (30) comprising a bore (56) fittingly receiving the cross section of the nut (44).
    公开号:FR3069608A1
    申请号:FR1757031
    申请日:2017-07-25
    公开日:2019-02-01
    发明作者:Jerome Delaporte；Anthony Goepp
    申请人:PSA Automobiles SA；
    IPC主号:
    专利说明:

    "PARKING LOCK CONTROL SYSTEM FOR LOCKING
    A TRANSMISSION OF A MOTOR VEHICLE ”The present invention relates to a control system for a parking lock of a motor vehicle transmission, as well as a transmission comprising such a control system of its parking lock, and a motor vehicle equipped with a transmission comprising this control system.
    Certain motor vehicle transmissions, in particular automatic gearboxes for heat engines or speed reducers for electric vehicles, include a parking lock making it possible to stably block a rotating element of the transmission permanently connected to driving wheels of the vehicle.
    A command operated by the driver on the stationary vehicle, generally using the transmission control lever, has the parking lock in its locked position in order to keep the vehicle stopped. The locking position is maintained in particular after the engine has stopped and the vehicle has been switched off, which removes any source of energy for the transmission, in order to ensure safety.
    A known parking lock system, presented in particular in document DE-A1-102015100067, comprises a blocking lever having one end fixed by a pivot to the transmission casing, and another end comprising a finger which descends into a succession of recesses made on a parking wheel permanently linked to the drive wheels of the vehicle, to block this wheel.
    A longitudinally sliding axis is linked to a cam which pushes on the locking lever behind his finger, in order to control this lever.
    In a variant, a known type of control of the locking lever, comprises a screw fixed to the end of the shaft of an electric motor, which axially displaces a nut locked in rotation, linked to a carriage to drive it. The carriage has a support cam on the lever behind his finger.
    The linear guidance of the carriage is achieved by a slide receiving this carriage, formed in a folded sheet, having on two opposite sides a longitudinal groove each receiving a boss of the nut to prevent it from turning.
    This type of control presents assembly problems of the nut in the linear guide slide. Engaging the bosses in the longitudinal grooves is not easy to achieve. In addition, the grooves machined on the sides of the slide for guiding the nut weaken this slide.
    The present invention aims in particular to avoid these drawbacks of the prior art.
    To this end, it proposes a system for controlling a parking lock to block a transmission of a motor vehicle, comprising a motorization driving a screw in rotation, and comprising a nut engaged on this screw, locked in rotation and sliding axially by acting on a transmission blocking lever, this control system being remarkable in that the nut has a constant cross section which is not circular, and in that the motorization comprises a cover comprising a receiving hole adjusted cross-section of the nut.
    An advantage of this control system is that the drilling of the hood adjusted on the cross section of the nut having a non-circular section constitutes a compact, rigid and economical means of keeping this nut in rotation while allowing freely its axial sliding.
    In addition, mounting is easy by simply engaging the nut in the bore of the cover.
    The lock system according to the invention may further include one or more of the following characteristics, which can be combined with one another.
    Advantageously, the cover has a cylindrical shape aligned on the axis of the motorization, comprising a rear end which adjusts to a circular front boss of this motorization.
    In this case, advantageously the front boss of the motorization comprises lugs adjusted in cutouts in the rear end of the cover, and an open rod is engaged on an external circular groove formed both on the cover and on the pins.
    Advantageously, the nut has a cross section comprising, along its length, longitudinal studs.
    Advantageously, the control system comprises axial end stops of the nut, disposed inside the cover.
    Advantageously, the axial stops include Belleville washers.
    In particular, the control system may include a front Belleville washer disposed axially between a rear stop ring fixed on the nut, and a transverse face of the front end of the cover.
    In particular, the control system may include rear Belleville washers arranged axially between the rear end of the nut, and the engine.
    The invention also relates to a transmission for a motor vehicle equipped with a parking lock, remarkable in that this parking lock comprises a control system comprising any of the preceding characteristics.
    The invention further relates to a motor vehicle comprising a transmission equipped with a parking lock, remarkable in that this parking lock comprises a control system comprising any of the preceding characteristics.
    The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly in the explanatory description which follows, made with reference to the accompanying drawings given solely by way of example illustrating an embodiment of the invention, and in which:
    - Figure 1 is a view of a parking lock system according to the prior art; and
    - Figures 2 and 3 are views respectively outside and in axial section, of a parking lock system according to the invention.
    FIG. 1 shows a lock system comprising an electric motor 2 arranged along a longitudinal axis, having on the front side indicated by the arrow "AV", a circular part 4 for centering in a casing of a transmission, and just behind an axial support flange 6 comprising holes provided for fixing this motor to the casing.
    A support 8 formed by a folded sheet, fixed to the transmission housing by screws 10, comprises a slide aligned longitudinally on the axis of the motor 2, having a cross section in the shape of "U".
    One side of the support 8 descending below the slide, supports a transverse axis 12 receiving the front end of a locking lever 14. The rear end of the locking lever 14 has a finger 16 adjusting in a series of recesses 18 distributed around a parking wheel 20 mounted on a shaft not shown, permanently connected to the drive wheels of the vehicle.
    A nut engaged on a threaded rod 24 fixed to the end of the motor shaft 2, has on each side a boss 28 engaged in a longitudinal groove 26 cut on each side of the support 8, so as to prevent rotation of this nut while allowing its sliding in the longitudinal direction.
    The nut axially drives a carriage guided in the slide of the support 8, which has a cam acting on the back of the locking lever 14 to lower its finger 16 into a recess in the parking wheel 18.
    Reverse movement of the carriage cam releases the locking lever 14, which rises under the effect of a spring 22 comprising turns wound around the transverse axis 12, maintaining a constant load on this lever for the raise. The finger 16 of this locking lever 14 then emerges from the recesses of the parking wheel 18, to unlock the transmission.
    This type of parking lock actuator poses several problems. The assembly of the carriage with its nut is delicate because it is necessary to align the two bosses 28 of the nut on the longitudinal grooves 26 of the support 8, which is delicate. Making these grooves 26 by machining the sides of the sheet of support 8 weakens this support.
    In addition the position of the axial end stops of the carriage is given by the stacking of many parts passing through the support 8 and the motor 2, which gives significant manufacturing dispersions in these positions.
    Figures 2 and 3 show an electric motor 2 having at its front end a front circular boss 32 forming a nose centered on the main axis of this motor, receiving the rear end of a cover 30 of cylindrical shape. The front circular boss 32 comprises two diametrically opposite lugs 34, each engaging in a cutout made on the rear of the cover 30 to prevent its rotation.
    The rear end of the cover 30 has a transverse circular groove formed around this cover, which is extended by similar grooves formed on the outside of each lug 34. An open circular ring 36 is engaged both in the groove of the cover 30 and in that of the lugs 34, by tightening at the bottom of these grooves by elastic deformation to ensure that this cover is resistant to axial force. Holding the cover 30 to the torque along the axis is ensured by the lugs 34.
    Alternatively the cover 30 can be attached to the electric motor 2 by any other method, such as crimping, welding or bonding.
    Behind the cover 30, the motor 2 comprises a cylindrical part 40 receiving in an annular groove an O-ring made of elastomer 38, intended to be clamped in a bore of the transmission casing to ensure a seal.
    The front end of the cover 30 is closed by a transverse end face comprising in the center a hole 56 receiving in an adjusted manner the cross section of a nut 44 aligned with the axis, which is not circular. In particular the cross section of the nut 38 comprises two tenons 46 longitudinally elongated, arranged in opposition, each having parallel flanks bearing on the corresponding shape of the bore of the cover 56, to support a torque while allowing the sliding of this nut .
    The nut 44, axially elongated, is engaged over a great length, on a screw 42 fixed to the end of the motor shaft 2. The rotation of the motor 2 causes its screw 42 to be screwed or unscrewed relative to the nut 44 blocked in rotation, which then slides in one direction or the other.
    The rear end of the nut 44 has a circular outer groove receiving a stop ring 48. A front stop formed by a Belleville washer before 50, is adjusted around the nut 44 as well as in the cylindrical part cover 30.
    The nut 44 arriving at the end of the front stroke, the retaining ring 48 is supported on the inside diameter of the Belleville washer before 50, its outside diameter being supported on the front transverse face of the cover 30.
    A slightly elastic front end-of-travel stop is obtained, formed with very few looped elements between the motor 2 and its cover 30 forming a sub-assembly, which limits the manufacturing dispersions of the axial positioning of this stop. . The stiffness of this end stop is easily adjustable by choosing the characteristics of the Belleville washer before 50.
    Two Belleville rear washers 52 arranged in opposition, are adjusted around the screw 42, behind the nut 44.
    The nut 44 arriving at the end of the rear stroke, its rear end bears on the inside diameter of a first rear Belleville washer 52, which transmits this support by its outside diameter on the second Belleville washer arranged in opposition. The second rear Belleville washer 52 rests itself on a rear ring 54 axially wedged on the motor 2.
    In the same way, a slightly elastic rear end-of-travel stop is obtained, having a precise axial positioning, the stiffness of which can be easily adjusted. It is possible in particular after the assembly of the sub-assembly, to carry out during the operation of the electric motor 2, a learning of the positions of the front and rear stops, by controlling this motor with a detection of the increases in forces on the stops making it possible to stop control before the blocking of this motor, and to locate the axial positions with precision.
    The nut 44 is linked to a carriage, not shown, sliding axially, which controls the engagement or release of a locking lever 14, for actuating the parking lock of a transmission.
    Advantageously, the electric motor 2 equipped with the screw 42, the nut 44 and the cover 30, forms a subassembly easily assembled and prepared at a supplier, which is ready to be placed on a transmission by the manufacturer of this transmission. This sub-assembly can be tested at the end of assembly, to guarantee all performance.
    In this way the manufacturer of the transmission does not intervene in the assembly and the internal adjustments of the axially sliding system, in particular in the positioning of the stops which are adjusted in advance.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. A parking lock control system for blocking a transmission of a motor vehicle, comprising a motorization (2) driving in rotation a screw (42), and comprising a nut (44) engaged on this screw (42) , locked in rotation and sliding axially by acting on a transmission locking lever (14), characterized in that the nut (44) has a constant cross section which is not circular, and in that the motorization ( 2) comprises a cover (30) comprising a bore (56) receiving in an adjusted manner the cross section of the nut (44).
    [2" id="c-fr-0002]
    2. Control system according to claim 1, characterized in that the cover (30) has a cylindrical shape aligned on the axis of the motorization (2), comprising a rear end which adjusts to a circular front boss (32 ) of this motorization (2).
    [3" id="c-fr-0003]
    3. Control system according to claim 2, characterized in that the front boss (32) of the motorization (2) comprises lugs (34) adjusted in cutouts in the rear end of the cover (30), and in that that an open rod (36) is engaged on an outer circular groove formed both on the cover (30) and on the pins (34).
    [4" id="c-fr-0004]
    4. Control system according to any one of the preceding claims, characterized in that the nut (44) has a cross section comprising along its length longitudinal pins (46).
    [5" id="c-fr-0005]
    5. Control system according to any one of the preceding claims, characterized in that it comprises axial end-of-travel stops for the nut (44), arranged inside the cover (30).
    [6" id="c-fr-0006]
    6. Control system according to claim 5, characterized in that the axial stops comprise Belleville washers (50, 52).
    [7" id="c-fr-0007]
    7. Control system according to claim 6, characterized in that it comprises a front Belleville washer (50) disposed axially between a rear stop ring (48) fixed on the nut (44), and a transverse face d 'front end of the cover (30).
    [8" id="c-fr-0008]
    8. Control system according to claim 6 to 7, characterized in that it comprises rear Belleville washers (52) disposed axially between the rear end of the nut (44), and the motorization (2).
    [9" id="c-fr-0009]
    9. Transmission for a motor vehicle equipped with a parking lock, characterized in that this parking lock comprises a control system according to any one of the preceding claims.
    [10" id="c-fr-0010]
    10. Motor vehicle comprising a transmission equipped with a parking lock, 5 characterized in that this parking lock comprises a control system according to any one of claims 1 to 8.
    类似技术:
    公开号 | 公开日 | 专利标题
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    WO2001050041A2|2001-07-12|Control assembly for a robotised gearbox
    同族专利:
    公开号 | 公开日
    FR3069608B1|2019-08-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5788008A|1996-07-12|1998-08-04|Joseph Pollak Corporation|Actuator for 4-wheel drive vehicle|
    US20060169084A1|2004-10-26|2006-08-03|Todd Meaney|Vehicle gear box actuator|
    DE102015100067A1|2015-01-06|2016-07-07|Gkn Driveline International Gmbh|Parking lock arrangement|
    DE102015218411B3|2015-09-24|2017-02-02|Siemens Aktiengesellschaft|Positioning method for a parking brake|
    CN205101548U|2015-11-04|2016-03-23|科力远混合动力技术有限公司|Degree of depth hybrid gearbox parking mechanism|CN110748640A|2019-11-01|2020-02-04|东风汽车集团有限公司|P-gear parking system and automobile|
    CN110778712A|2019-11-01|2020-02-11|东风汽车集团有限公司|Parking executor and car|
    FR3103238A1|2019-11-15|2021-05-21|Psa Automobiles Sa|TRANSMISSION LOCKING WHEEL WITH SHOCK ABSORBER|
    法律状态:
    2019-02-01| PLSC| Search report ready|Effective date: 20190201 |
    2019-06-21| PLFP| Fee payment|Year of fee payment: 3 |
    2020-06-23| PLFP| Fee payment|Year of fee payment: 4 |
    2021-06-23| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1757031A|FR3069608B1|2017-07-25|2017-07-25|SYSTEM FOR CONTROLLING A PARKING LOCK TO BLOCK A TRANSMISSION OF A MOTOR VEHICLE|
    FR1757031|2017-07-25|FR1757031A| FR3069608B1|2017-07-25|2017-07-25|SYSTEM FOR CONTROLLING A PARKING LOCK TO BLOCK A TRANSMISSION OF A MOTOR VEHICLE|
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