Parking lock device for a vehicle gearbox

Abstract

The present invention relates to a parking lock device, in particular for a vehicle, comprising: a parking lock gear, in particular capable of being constrained to rotate with a shaft of a transmission of the vehicle, the parking lock gear comprising a plurality of recesses; a locking element, in particular in the form of a rod, that is movable between a locking position and an unlocking position via a linear translational movement and which, in the locking position, engages with a recess of the parking lock gear and, in the unlocking position, is at a distance from a recess of the parking lock gear; an actuator connected to the locking element, by means of which the locking element can be moved between the locking position and the unlocking position, the actuator comprising an electric motor with a rotatable output shaft; and a movement transformation mechanism for transforming the rotation of the output shaft of the electric motor into the linear translation of the locking element. According to the invention, the movement transformation mechanism comprises at least one cam path associated with at least one rolling element capable of travelling along the cam path.

Description

[0001] Description

[0002] Title of the invention: Parking lock device for a vehicle transmission [1] The invention relates to a parking lock device for a vehicle transmission, particularly a motor vehicle equipped with an automatic transmission, for example, a hybrid vehicle. The invention also applies to a parking lock system for a reduction gear associated with an electric vehicle motor. The transmission or reduction gear will more generally be referred to as a gearbox. This locking system is better known by its English term "park-lock" or "parking lock".

[0003] [2] Classically, such a device includes an actuator enabling the locking or parking of the transmission box by means of a rotary lever mechanism engaging with a gear of the transmission box.

[0004] [3] This rotary lever mechanism has the disadvantage of complicating the parking lock function of the transmission because the lever mechanism has a large number of parts which makes it complex, expensive and bulky.

[0005] [4] It is therefore necessary to propose a solution for locking the transmission in parking position that is simple, inexpensive and compact.

[0006] [5] Thus, the invention proposes a parking locking device, particularly for a vehicle, comprising:

[0007] - a locking wheel, particularly suitable for being rotationally fixed to a transmission shaft of the vehicle, said locking wheel comprising a plurality of recesses,

[0008] - a locking element, particularly in the form of a rod, movable between a locked position and an unlocked position along a linear translation, and which, in the locked position, engages with a recess in the locking wheel and, in the unlocked position, is at a distance from a recess in the locking wheel; - an actuator linked to the locking element and by means of which the locking element can be moved between the locked and unlocked positions, the actuator comprising an electric motor with a rotating output shaft, a motion transformation mechanism for converting the rotation of the electric motor's output shaft into the linear translation of the locking element. According to the invention, the motion transformation mechanism comprises at least one cam track associated with at least one rolling element capable of traveling along the cam track.

[0009] [6] The parking locking device according to the invention makes it possible to perform the locking and unlocking function of the vehicle transmission in a simple, inexpensive and compact manner thanks to the direct engagement of the locking element in a recess of the locking wheel.

[0010] [7] The motion transformation mechanism with a cam track associated with at least one rolling element also reduces friction between the elements. The parking locking device is thus designed to be simple and compact.

[0011] [8] According to the invention, the actuator further comprises a reduction mechanism between the electric motor and the motion transformation mechanism.

[0012] Advantageously, the reduction mechanism is a set of gears. Alternatively, the reduction mechanism is a belt or a chain.

[0013] [9] According to the invention, the motion transformation mechanism comprises a fixed tubular wall and a support element for the locking element, said fixed tubular element comprises at least one helical portion groove forming at least one cam track, said support element is rotationally linked with the rotating output shaft of the electric motor and is translationally linked with the fixed tubular element, said support element comprises at least one rolling element, in particular in the form of a roller.

[0014]

[0010] According to the invention, said fixed tubular element comprises two helical portion grooves in diametrically opposed positions and said support element comprises two rolling elements mounted at each end of the support element.

[0011] According to the invention, the motion transformation mechanism comprises an eccentric plate rotating about an axis of rotation and a support element for the locking element, said eccentric plate comprises a curved groove forming at least one cam track, said eccentric plate is rotationally linked with the rotating output shaft of the electric motor, said support element comprises at least one rolling element, in particular in the form of a roller.

[0015]

[0012] According to the invention, the curved groove comprises an inner contour forming at least one cam track; said inner contour is either open or closed. A closed contour allows the locking element to be pushed and pulled, thereby disengaging the rod that might be blocked by the transmission. An open contour allows the locking element to be simply pushed or pulled.

[0016]

[0013] According to the invention, the axis of rotation of the eccentric plate coincides with the rotating output shaft of the electric motor. This eliminates the need for a reduction mechanism.

[0017]

[0014] According to the invention, the eccentric plate comprises a portion of teeth located on an external contour of the eccentric plate, said portion of teeth being rotationally linked with the rotating output shaft of the electric motor. This allows the electric motor to be positioned offset from the eccentric plate.

[0018]

[0015] According to the invention, the motion transformation mechanism comprises an eccentric pin rotationally linked with the rotating output shaft of the electric motor and a support element for the locking element, said support element includes a straight groove forming at least one cam track and said eccentric pin includes at least one rolling element, in particular in the form of a roller.

[0019]

[0016] According to the invention, the motion transformation mechanism comprises a gear and a support element for the locking element. The gear comprises a negative or positive eccentric footprint with respect to the gear's axis of rotation, forming at least one cam track. The support element comprises at least one rolling element, in particular in the form of a roller.

[0017] According to the invention, the electric motor shaft is parallel to the extension direction of the locking element. Alternatively, the electric motor shaft forms an angle with the extension direction of the locking element.

[0020]

[0018] Other features and advantages of the invention will become apparent from the following detailed examples of embodiments, with reference to the attached figures:

[0021]

[0019] [Figure 1] represents a first embodiment of a parking locking device according to the invention;

[0022]

[0020] [Figure 2] represents in perspective the motion transformation mechanism of the device of [Figure 3];

[0023]

[0021] [Figure 3] represents a second embodiment of a parking locking device according to the invention;

[0024]

[0022] [Figure 4] represents a third embodiment of a parking locking device according to the invention;

[0025]

[0023] [Figure 5] represents a fourth embodiment of a parking locking device according to the invention;

[0026]

[0024] [Figure 6] represents a fifth embodiment of a parking locking device according to the invention;

[0027]

[0025] [Figure 7] represents a sixth embodiment of a parking locking device according to the invention;

[0028]

[0026] [Figure 8] represents a seventh embodiment of a parking locking device according to the invention;

[0029]

[0027] [Figure 9] represents an eighth embodiment of a parking locking device according to the invention;

[0030]

[0028] It should be noted that the figures disclose the invention in sufficient detail for its implementation, and that said figures help to further define the invention if necessary. However, the invention should not be limited to the embodiments disclosed in the description.

[0031]

[0029] In all embodiments according to the invention, the device 100, 200, 300, 400, 500, 600, 700, 800 comprises a locking wheel 12, in particular rotationally fixed to a shaft 11 of a vehicle transmission. The shaft 11 is generally located inside a transmission housing 20. The locking wheel 12 comprises a plurality of recesses 13 arranged on the contour or periphery of the locking wheel 12.

[0032]

[0030] A locking element 10 in the form of a rod locks the vehicle's transmission. For this purpose, the rod 10 is movable between a locked position and an unlocked position along a linear translation of displacement D. This linear translation of displacement D can be parallel or perpendicular to the transmission shaft 11. In the locked position, the rod 10 engages with a recess 13 in the locking wheel 12, and in the unlocked position, the rod 10 is at a distance from a recess 13 in the locking wheel 12.

[0033]

[0031] The rod 10 is made movable by means of an actuator 110, 210, 310, 410, 510, 610, 710, 810 connected to the rod 10. Thanks to this actuator, the rod 10 can be moved linearly between the locked and unlocked positions. By way of non-limiting example, the rod 10 moves with a stroke of 5 mm between its two extreme locked and unlocked positions. Naturally, the stroke is adapted according to the requirements and the size of the locking wheel 12 and its recesses 13.

[0034]

[0032] Figure 1 represents a first embodiment of a parking locking device 100 according to the invention.

[0035]

[0033] In this first embodiment, the actuator 110 comprises a housing 4 which is adapted to be fixed onto the transmission housing 20. The actuator 110 comprises an electric motor 1 with a rotating output shaft 2 on which a motor output pinion 121 is mounted. The electric motor 1 is preferably a DC motor which may be brushed or brushless.

[0036]

[0034] A motion transformation mechanism 130 allows the rotation of the output shaft 2 of the electric motor 1 to be transformed into the linear translation of the rod 10. The motion transformation mechanism 130 will be described more precisely in relation to [Figure 2].

[0037]

[0035] The actuator 110 also includes a reduction mechanism 120 disposed between the electric motor 1 and the motion transformation mechanism 130. The reduction mechanism 120 reduces the rotational speed and increases the torque. In this case, the reduction mechanism 120 is a gear set comprising the drive pinion 121, a double-stage gear 122, and a toothed sector 123 associated with the motion transformation mechanism 130. The drive pinion 121 meshes with the first stage of the gear 122, and the second stage of the gear meshes with the toothed sector 123.

[0038]

[0036] The electric motor 1, the reduction mechanism 120 and the motion transformation mechanism 130 are housed in the housing 3 of the actuator 110. The rod 10 is partly guided in translation by the housing 3.

[0039]

[0037] Figure 2 allows for a better visualization of the motion transformation mechanism 130 which transforms the rotation of the output shaft 2 of the electric motor 1 into the linear translation of the rod 10.

[0040]

[0038] The motion transformation mechanism 130 includes a support member 131, in the shape of a bell having a tubular wall 132 centered on the translation direction of the rod 10 and a base 133 to which is attached a pivot 134 coaxial with the tubular wall 132. The toothed sector 123 is mounted to pivot freely on the pivot 134 so that the support member 131 directly carries the toothed sector 123.

[0041]

[0039] Two grooves 135 are formed transversely in the tubular wall 132 in diametrically opposite positions. Each groove 135 has a shape substantially resembling a portion of a helix, arranged so as to have a ramped lower flank forming a cam track 140 on which a rolling element 150 in the form of a roller rolls. The rollers 150 are mounted at the ends of a support element 136, which is mounted to pivot at the end of the rod 10 extending within the inner space of the tubular wall 132. The support element 136 is fixed in translation on the rod 10.

[0042]

[0040] The support element 136 is rotationally linked to the toothed sector 123 by connecting elements 137, each formed of a finger extending parallel to the direction of translation and having one end fixed to the toothed sector 123 and, on the opposite side, an end portion received by sliding in housings 138 which are provided in the support element 136.

[0041] Circular arc openings 139 provided in the bottom 133 allow the passage of the connecting elements 137 and their movement in a circular arc centered on the pivot 134.

[0043]

[0042] The rotation of the motor output pinion 121 causes the toothed sector 123 to rotate via the reduction mechanism 120. The toothed sector 123 drives the support element 136 in rotation via the connecting elements 137. The rotation of the support element 136 causes the rollers 150 to move along the cam tracks 140, and the rollers 150, cooperating with the cam tracks 140, move the support element 136 and thus the rod 10 in translation. As the support element 136 is pivotally mounted on the rod 10, the support element 137, when driven in rotation by the toothed sector 123 via the connecting elements 137, does not exert any torque on the rod 10.

[0044]

[0043] The invention also covers any variant embodiment of this first embodiment falling within the scope of the invention as defined by the claims.

[0045]

[0044] In particular, the means for guiding the rotation of the toothed sector 123 can be formed of a male element, such as the pivot 134, or of a female element such as a housing arranged to ensure peripheral guidance of the toothed sector 123.

[0046]

[0045] The pivot 134 can be rigidly fixed to the bottom 133 of the support member 131.

[0047]

[0046] The support member 131 may have a different shape from that described and for example the base 133 may be replaced by a diametrical beam supporting the pivot 134.

[0048]

[0047] The fingers 137 constituting the connecting elements may have one end fixed to the support element 136 and, on the opposite side, an end portion mounted to slide in a housing of the toothed sector 123.

[0049]

[0048] The cam tracks 140 can be formed from a rib projecting into the tubular wall 132.

[0050]

[0049] Figure 3 represents a second embodiment of a parking locking device 200 according to the invention.

[0050] In this second embodiment, the motion transformation mechanism 230 for transforming the rotation of the output shaft 2 of the electric motor into the linear translation of the rod 10 is implemented differently.

[0051]

[0051] The actuator 210 includes a housing 3 that is suitable for mounting on the transmission housing 20. The actuator 210 includes an electric motor (not visible). The electric motor is preferably a DC motor, which may be brushed or brushless. The electric motor includes an output shaft 2 that rotates about an axis X1. In other words, the axis X1 coincides with the output shaft 2 of the electric motor.

[0052]

[0052] This output shaft 2 is directly linked in rotation with a motion transformation mechanism 230 which allows the rotation of the output shaft 2 of the electric motor to be transformed into the linear translation of the rod 10. It is obviously possible to optionally interpose a reduction mechanism between the motor output shaft 2 and the motion transformation mechanism 230.

[0053]

[0053] The motion transformation mechanism 230 includes an eccentric plate 231 rotating about the axis X1. The eccentric plate 231 is preferably a metal plate and includes a curved groove 232 forming a cam track 240. The curved groove 232 includes an inner contour 233 forming the cam track 240. In the embodiment of [Figure 3], the inner contour 233 is open.

[0054]

[0054] The motion transformation mechanism 230 further includes a support element 236 in the form of a fork connected to the rod 10. The support element 236 includes a rolling element 250 in the form of a roller.

[0055] The support element 236 is preferably formed by a "U" shaped piece and the roller 250 is positioned between the sides of the "U".

[0056]

[0055] The rotation of the output shaft 2 of the electric motor causes the eccentric plate 231 to rotate. The rotation of the eccentric plate 231 causes the roller 250 to move along the cam track 240, and the roller 250, in cooperation with the cam track 240, moves the support element 236 in translation, and thus the rod 10.

[0056] The electric motor and the motion transformation mechanism 230 are housed in the actuator housing 3 210. The rod 10 is partially guided in translation by the housing 3.

[0057]

[0057] Figure 4 represents a third embodiment of a parking locking device 300 according to the invention.

[0058]

[0058] This third embodiment is technically close to the second embodiment but differs with regard to the motion transformation mechanism 330.

[0059]

[0059] The actuator 310 includes a housing 3 which is suitable for mounting on the transmission housing 20. The actuator 310 includes an electric motor (not visible) with a rotating output shaft 2 on which is mounted a motor output pinion 321 having teeth 322. The electric motor is preferably a DC motor which may be brushed or brushless.

[0060]

[0060] This output shaft 2 is rotationally linked with a motion transformation mechanism 330 which allows the rotation of the output shaft 2 of the electric motor to be transformed into the linear translation of the rod 10. It is obviously possible to optionally interpose a reduction mechanism between the motor output shaft 2 and the motion transformation mechanism 330.

[0061]

[0061] The motion transformation mechanism 330 comprises an eccentric plate 331 rotating about an axis X2 located at a distance from the output shaft 2 of the electric motor. The eccentric plate 331 is preferably a metal plate and includes a curved groove 332 forming a cam track 340. The curved groove 332 includes an inner contour 333 forming the cam track 340. In the embodiment of [Figure 4], the inner contour 333 is open.

[0062]

[0062] The motion transformation mechanism 330 further includes a support element 336 in the form of a fork connected to the rod 10. The support element 336 includes a rolling element 350 in the form of a roller.

[0063] The support element 336 is preferably formed by a "U" shaped piece and the roller 350 is positioned between the sides of the "U".

[0064]

[0063] The eccentric plate 331 includes a toothed portion 335 located on an external contour 334 of the eccentric plate 331. The toothed portion 335 is rotationally connected to the teeth 322 of the output pinion 321 of the rotating output shaft 2 of the electric motor. The toothed portion 335 is curved and concentric with the axis of rotation X2 of the eccentric plate 331.

[0065]

[0064] The rotation of the output shaft 2 of the electric motor causes the rotation of the eccentric plate 331 by means of the teeth 322, 335. The rotation of the eccentric plate 331 causes the roller 350 to move along the cam track 340 and the roller 350, cooperating with the cam track 340, moves the support element 336 in translation and therefore the rod 10.

[0066]

[0065] The electric motor and the motion transformation mechanism 330 are housed in the housing 3 of the actuator 310. The rod 10 is partially guided in translation by the housing 3.

[0067]

[0066] Figure 5 represents a fourth embodiment of a parking locking device 400 according to the invention.

[0068]

[0067] This fourth embodiment is technically close to the second embodiment but differs with regard to the motion transformation mechanism 330.

[0069]

[0068] The actuator 410 includes a housing 3 that is suitable for mounting on the transmission housing 20. The actuator 410 includes an electric motor (not visible). The electric motor is preferably a DC motor, which may be brushed or brushless. The electric motor includes an output shaft 2 that rotates about an axis X3. In other words, the axis X3 coincides with the output shaft 2 of the electric motor.

[0070]

[0069] This output shaft 2 is directly linked in rotation with a motion transformation mechanism 430 which allows the rotation of the output shaft 2 of the electric motor to be transformed into the linear translation of the rod 10. It is obviously possible to optionally interpose a reduction mechanism between the motor output shaft 2 and the motion transformation mechanism 430.

[0071]

[0070] The motion transformation mechanism 430 includes an eccentric plate 431 rotating about the axis X3. The eccentric plate 431 is preferably a metal plate and includes a curved groove 432 forming a cam track 440. The curved groove 432 includes an inner contour 433 forming the cam track 440. In the embodiment of [Figure 5], the inner contour 233 is closed.

[0072]

[0071] The motion transformation mechanism 430 further includes a support element 436 in the form of a fork connected to the rod 10. The support element 436 includes a rolling element 450 in the form of a roller.

[0073] The support element 436 is preferably formed by a "U" shaped piece and the roller 450 is positioned between the sides of the "U".

[0074]

[0072] The rotation of the output shaft 2 of the electric motor causes the rotation of the eccentric plate 431. The rotation of the eccentric plate 431 causes the roller 450 to move along the cam track 440 and the roller 450, cooperating with the cam track 440, moves the support element 436 in translation and therefore the rod 10.

[0075]

[0073] The electric motor and the motion transformation mechanism 430 are housed in the housing 3 of the actuator 410. The rod 10 is partially guided in translation by the housing 3.

[0076]

[0074] Figure 6 represents a fifth embodiment of a parking locking device 500 according to the invention.

[0077]

[0075] This fifth embodiment is technically close to the third embodiment but differs in that it further includes a reducing mechanism 520.

[0078]

[0076] The actuator 510 comprises a housing 3 which is suitable for mounting on the transmission housing 20. The actuator 510 comprises an electric motor 1 with a rotating output shaft (not visible) on which is mounted a motor output pinion having teeth (not visible). The electric motor is preferably a DC motor which may be brushed or brushless.

[0079]

[0077] This output shaft is rotationally linked with a motion transformation mechanism 530 which allows the rotation of the output shaft of the electric motor to be transformed into the linear translation of the rod 10.

[0080]

[0078] The actuator 510 also includes a reduction mechanism 520 disposed between the electric motor 1 and the motion transformation mechanism 530. The reduction mechanism 520 reduces the rotational speed and increases the torque. In this case, the reduction mechanism 520 is a gear set comprising the drive pinion, a two-stage gear 522, and a toothed portion 535 associated with the motion transformation mechanism 530. The drive pinion meshes with the first stage of the gear 522, and the second stage of the gear meshes with the toothed portion 535.

[0081]

[0079] The motion transformation mechanism 530 includes an eccentric plate 531 rotating about an axis X4 located at a distance from the output shaft 2 of the electric motor. The eccentric plate 531 includes a curved groove 532 forming a cam track 540. The curved groove 532 includes an inner contour 533 forming the cam track 540. In the embodiment of [Figure 6], the inner contour 533 is closed.

[0082]

[0080] The motion transformation mechanism 530 further includes a support element 536 in the form of a fork connected to the rod 10. The support element 536 includes a rolling element 550 in the form of a roller.

[0083] The support element 536 is preferably formed by a "U" shaped piece and the roller 550 is positioned between the sides of the "U".

[0084]

[0081] The eccentric plate 531 includes the toothed portion 335 located on an external contour 534 of the eccentric plate 531. The toothed portion 535 is rotationally linked with the teeth of the output pinion of the rotating output shaft of the electric motor 1 via the reduction mechanism 520. The toothed portion 535 is curved and concentric with the axis of rotation X4 of the eccentric plate 531.

[0085]

[0082] The rotation of the electric motor's output shaft causes the eccentric plate 331 to rotate via its teeth. The rotation of the eccentric plate 531 causes the roller 550 to move along the cam track 540, and the roller 550, in conjunction with the cam track 540, translates the support element 536 and thus the rod 10.

[0086]

[0083] The electric motor 1, the reduction mechanism 520 and the motion transformation mechanism 530 are housed in the housing 3 of the actuator 510. The rod 10 is partly guided in translation by the housing 3.

[0087]

[0084] Figure 7 represents a sixth embodiment of a parking locking device 600 according to the invention.

[0085] The actuator 610 comprises a housing 3 adapted to be fixed onto the transmission housing 20. The actuator 610 comprises an electric motor 1 with a rotating output shaft 2 on which a motor output pinion is mounted.

[0088] 621 equipped with teeth. The electric motor 1 is preferably a direct current motor which may be with or without brushes.

[0089]

[0086] This output shaft 2 is rotationally linked with a motion transformation mechanism 630 which allows the rotation of the output shaft 2 of the electric motor 1 to be transformed into the linear translation of the rod 10.

[0090]

[0087] The actuator 610 also includes a reduction mechanism 620 disposed between the electric motor 1 and the motion conversion mechanism 630. The reduction mechanism 620 reduces the rotational speed and increases the torque. In this case, the reduction mechanism 620 is a gear set comprising the drive pinion 621, a gear 622, and a toothed portion 635 associated with the motion conversion mechanism 630. The drive pinion 621 meshes with the gear 622 via a complementary gear (not visible), and this gear 622 meshes with the toothed portion 635.

[0091]

[0088] The motion transformation mechanism 630 comprises the toothed portion 635 and a support element 636 connected to the rod 10. The support element 636 is plate-shaped, in particular metallic. The toothed portion 635 is mounted to rotate about an axis X5

[0092]

[0089] The motion transformation mechanism 630 also includes an eccentric pin 632 about an axis X6 at a distance from the axis X5. The eccentric pin 632 is arranged on the toothed portion 635 and is thus rotationally linked with the rotating output shaft 2 of the electric motor 1. When the toothed portion 635 pivots, the eccentric pin 632 also pivots about the axis X5.

[0093]

[0090] The support element 636 includes a straight groove 633 forming the cam track 640. The straight groove 633 has an extension direction perpendicular to the extension direction of the rod 10. The eccentric pin 632 includes a rolling element 650, in particular in the form of a roller. In the embodiment of [Figure 7], the straight groove 633 has a closed contour but may also have an open contour.

[0091] The rotation of the output shaft 2 of the electric motor 1 causes the rotation of the toothed portion 635 via the reduction mechanism 620. The rotation of the toothed portion 635 causes the roller 650 to move along the cam track 640, and the roller 650, cooperating with the cam track 540, translates the support element 636 and thus the rod 10.

[0094]

[0092] The electric motor 1, the reduction mechanism 620 and the motion transformation mechanism 630 are housed in the housing 3 of the actuator 610. The rod 10 is partly guided in translation by the housing 3.

[0095]

[0093] Figure 8 represents a seventh embodiment of a parking locking device 700 according to the invention.

[0096]

[0094] The actuator 710 comprises an electric motor 1 with a rotating output shaft 2 on which is mounted a motor output pinion 721 having teeth. The electric motor 1 is preferably a DC motor which may be brushed or brushless.

[0097]

[0095] The motion transformation mechanism 730 comprises a gear 731 and a support element 736 for the rod 10. The gear 731 is mounted to rotate freely about an axis X7. The gear 731 has teeth 735 on its periphery that mesh with the motor output pinion 721. It is obviously possible to optionally interpose a reduction mechanism between the motor output shaft 2 and the motion transformation mechanism 730.

[0098]

[0096] The gear 731 includes a negative eccentric recess 732 with respect to the axis of rotation X7 of the gear 731, forming a cam track 740. The negative eccentric recess 732 is machined into the material of the gear 731, which is preferably plastic. The support element 736 includes a rolling element 750, particularly in the form of a roller.

[0099]

[0097] The rotation of the output shaft 2 of the electric motor 1 causes the rotation of the toothed wheel 731. The rotation of the toothed wheel 731 causes the roller 750 to move along the cam track 740 and the roller 750, cooperating with the cam track 740, moves the support element 736 in translation and therefore the rod 10.

[0098] Figure 9 represents an eighth embodiment of a parking locking device 800 according to the invention.

[0100]

[0099] The actuator 810 comprises an electric motor 1 with a rotating output shaft 2 on which is mounted a motor output pinion 821 having teeth. The electric motor 1 is preferably a DC motor which may be brushed or brushless.

[0101]

[0100] The motion transformation mechanism 830 comprises a gear 831 and a support element 836 for the rod 10. The gear 831 is mounted to rotate freely about an axis X8. The gear 831 has teeth 835 on its periphery that mesh with the motor output pinion 821. It is obviously possible to optionally interpose a reduction mechanism between the motor output shaft 2 and the motion transformation mechanism 830.

[0102]

[0101] The gear 831 comprises a positive eccentric recess 832 with respect to the axis of rotation X7 of the gear 831, forming a cam track 840. The negative eccentric recess 832 is formed from the same material as the gear 831, preferably plastic. The support element 736 comprises two rolling elements 750, in particular in the form of rollers distributed on each side of the positive eccentric recess 832.

[0103]

[0102] The rotation of the output shaft 2 of the electric motor 1 causes the rotation of the gear 831. The rotation of the gear 831 causes the rollers 850 to move along the cam track 840 and the rollers 850, cooperating with the cam track 840, move the support element 836 in translation and therefore the rod 10.

[0104]

[0103] Although the invention has been described in connection with several particular embodiments, it is quite evident that it is by no means limited to them and that it includes all the technical equivalents of the means described.

[0105]

[0104] In the claims, the reference symbols in parentheses should not be interpreted as a limitation of the claim.

Claims

Demands

1. Parking locking device (100, 200, 300, 400, 500, 600, 700, 800), in particular for a vehicle, comprising: - a locking wheel (12), in particular adapted to be rotationally fixed to a shaft (11) of a transmission of the vehicle, said locking wheel (12) comprising a plurality of recesses (13), - a locking element (10), in particular in the form of a rod, movable between a locking position and an unlocking position according to a linear translation of displacement (D) and which, in the locking position, engages with a recess (13) of the locking wheel (12) and, in the unlocking position, is at a distance from a recess (13) of the locking wheel (12), - an actuator (110, 210, 310, 410, 510, 610, 710, 810) linked to the locking element (10) and by means of which the locking element (10) can be moved between the locked position and the unlocked position, the actuator comprising an electric motor (1) with a rotating output shaft (2), a motion transformation mechanism (130, 230, 330, 430, 530, 630, 730, 830) for transforming the rotation of the output shaft (2) of the electric motor (1) into the linear translation of the locking element (10), characterized in that the motion transformation mechanism comprises at least one cam track (140, 240, 340, 440, 540, 640, 740, 840) associated with at least one element rolling (150, 250, 350, 450, 550, 650, 750, 850) suitable for traveling the cam path.

2. Device (100, 200, 300, 400, 500, 600, 700, 800) according to claim 1, characterized in that the actuator further comprises a reduction mechanism (120, 420, 520, 620, 720, 820) between the electric motor (1) and the motion transformation mechanism.

3. Device (100) according to claim 1 or 2, characterized in that the motion transformation mechanism (130) comprises a fixed tubular wall (132) and a support element (136) for the locking element (10), said fixed tubular element (132) comprising at least one helical portion groove (135) forming at least one cam track (140), said support element (136) is rotationally linked with the rotating output shaft (2) of the electric motor (1) and is translationally linked with the fixed tubular element (132), said support element (136) comprising at least one rolling element (150), in particular in the form of a roller.

4. Device (100) according to claim 3, characterized in that said fixed tubular element (132) comprises two helical portion grooves (135) in diametrically opposed positions and said support element (136) comprises two rolling elements (150) mounted at each end of the support element (136).

5. Device (200, 300, 400, 500) according to claim 1 or 2, characterized in that the motion transformation mechanism (230, 330) comprises an eccentric plate (231, 331, 431, 531) rotating about an axis of rotation (X1, X2, X3, X4) and a support element (236, 336, 436, 536) for the locking element (10), said eccentric plate (231, 331, 431, 531) comprising a curved groove (232, 332, 432, 532) forming at least one cam track (240, 340, 440, 540), said eccentric plate (231, 331, 431, 531) is rotationally linked with the rotating output shaft (2) of the electric motor, said support element (236, 336, 436, 536) includes at least one rolling element (250, 350, 450, 550), in particular in the form of a roller.

6. Device (200, 300, 400, 500) according to claim 5, characterized in that the curved groove (232, 332, 432, 532) comprises an inner contour (233, 333, 433, 533) forming at least one cam track (240, 340, 440, 540), said inner contour (233, 333, 433, 533) is open or closed.

7. Device (200, 400) according to claim 5 or 6, characterized in that the axis of rotation (X1, X3) of the eccentric plate (231, 431) coincides with the rotating output shaft (2) of the electric motor.

8. Device (300, 500) according to claim 5 or 6, characterized in that the eccentric plate (331, 531) comprises a toothed portion (335, 535) located on an external contour of the eccentric plate (334, 534), said toothed portion (335, 535) being rotationally linked with the rotating output shaft of the electric motor.

9. Device (600) according to claim 1 or 2, characterized in that the motion transformation mechanism (630) comprises an eccentric pin (632) rotationally linked with the rotating output shaft (2) of the electric motor (1) and a support element (636) for the locking element (10), said support element (636) comprising a straight groove (633) forming at least one cam track (640) and said eccentric pin (632) includes at least one rolling element (650), in particular in the form of a roller.

10. Device (700, 800) according to claim 1 or 2, characterized in that the motion transformation mechanism (730, 830) comprises a gear (731, 831) and a support element (736, 836) for the locking element (10), said gear (731, 831) comprising a negative (732) or positive (832) eccentric footprint with respect to the axis of rotation of the gear (X7, X8) forming at least one cam track (740, 840), said support element (736, 836) comprising at least one rolling element (750, 850), in particular in the form of a roller.

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