JP6571221B2 - Vehicle parking mechanism - Google Patents

Description

  The present invention relates to a vehicle parking mechanism that is applied to a transmission, a drive unit, and the like of a vehicle and locks the rotation shafts of the vehicle such that they cannot rotate during parking.

  Conventionally, as this type of parking mechanism, for example, the one described in Patent Document 1 is known. The parking mechanism is fixed to the output shaft of the transmission, and has a parking gear having a plurality of grooves on the outer periphery, and is provided on the upper side of the parking gear so as to be rotatable around the center in a state of extending obliquely, A parking pole having a lower end portion engageable with a groove of the parking gear, a parking rod provided with a tip end portion engaging with the upper end portion of the parking pole, and capable of moving forward and backward in the length direction are provided. When the vehicle is traveling, such as when the vehicle is not parked, the parking pole is located in a state in which the lower end thereof is separated from the parking gear.

  In the parking mechanism configured as described above, when the shift lever of the vehicle is put in the P range, the parking rod moves forward to push up the upper end portion of the parking pole, so that the lower end portion of the parking pole becomes the groove of the parking gear. Engage with. Thereby, rotation of the parking gear is prevented, and accordingly, the output shaft of the transmission is locked so as not to rotate (parking lock).

JP-A-2015-143554

  In the parking mechanism, various parts such as a parking pole and a parking rod extending in the radial direction are arranged around the parking gear. For this reason, it is necessary to secure a relatively large space around the parking gear, and the transmission becomes larger by that amount, especially in the radial direction of the rotating shaft to be locked when parking parking, such as the output shaft. End up.

  The present invention has been made to solve the above-described problems, and provides a vehicle parking mechanism that can be configured compactly in the radial direction of a rotating shaft to be locked in the parking lock. Objective.

  In order to achieve the above object, the invention according to claim 1 is directed to a rotating shaft 3 for rotationally driving the wheels of the vehicle V (the left wheel WL and the right wheel WR in the embodiment (hereinafter the same in this section)). Is a vehicle parking mechanism 1 that locks in a non-rotatable manner when the vehicle is parked, and a rotating shaft has a predetermined diameter and extends in the left-right direction between the left and right wheels WL, WR, and the shaft body. A larger diameter portion 3b having a larger diameter and rotatably provided integrally with the shaft body, and having a diameter smaller than the diameter of the larger diameter portion, and the shaft body is inserted through In addition, a cylindrical inner case portion 31A that rotatably supports the shaft body and a diameter larger than the diameter of the enlarged diameter portion are provided so as to cover the outer periphery of the inner case portion, and are integrated with the inner case portion. The outer case portion 31B configured in the Between the inner case portion and the outer case portion and a motor (actuator motor 41) provided between the inner case portion and the outer case portion, and having a rotor 41a rotatable around the inner case portion. Between the inner case portion and the outer case portion, and in contact with the rotating body and facing the enlarged diameter portion. It is provided so that it cannot rotate in the circumferential direction of the case part and is movable in the length direction of the inner case part, and moves between the rotating body and the enlarged diameter part as the rotating body rotates, and is related to the enlarged diameter part. A lock body 43 that can be engaged, and when the vehicle is parked, by rotating the rotating body with a motor, the lock body is moved to the enlarged diameter portion side and engaged with the enlarged diameter portion. The rotary shaft is locked.

  According to this configuration, the rotating shaft for rotating the vehicle wheel has a predetermined diameter and extends in the left-right direction, and has a larger diameter than the shaft main body and rotates integrally with the shaft main body. It has a possible diameter expansion part. The parking mechanism includes an inner case portion and an outer case portion that are integrally formed with each other, and the shaft main body of the rotating shaft is inserted into the cylindrical inner case portion and is rotatably supported.

  The motor, the rotating body, and the lock body are provided between the inner case portion and the outer case portion. That is, the motor is provided such that its rotor is rotatable in the circumferential direction of the inner case portion, the rotating body is provided so as to be rotatable in the circumferential direction of the inner case portion, and further, the lock body has an enlarged diameter of the rotating shaft In a state facing the portion, the inner case portion is provided so as not to rotate in the circumferential direction and to be movable in the length direction of the inner case portion.

  When the vehicle is parked, the rotating body is rotated by the operation of the motor, whereby the lock body is moved to the enlarged diameter portion side and engaged with the enlarged diameter portion, whereby the rotating shaft is locked. Thus, in the parking mechanism of the present invention, since the motor, the rotating body, and the locking body are disposed between the inner case portion and the outer case portion around the shaft main body with respect to the rotating shaft to be locked, The parking mechanism can be configured compactly in the radial direction of the rotating shaft while ensuring a smooth lock of the shaft.

  According to a second aspect of the present invention, in the vehicle parking mechanism according to the first aspect, each of the enlarged-diameter portions 3b protrudes by a predetermined length toward the lock body 43 and extends along the circumferential direction about the shaft body 3a. The lock body has a plurality of axial protrusions 3c arranged, and the lock body protrudes a predetermined length toward the enlarged diameter portion. When the rotary shaft 3 is locked, the lock body is positioned between adjacent axial protrusions in the circumferential direction. It has the lock convex part 55 engaged with an enlarged diameter part by inserting, It is characterized by the above-mentioned.

  According to this configuration, the diameter-enlarged portion of the rotating shaft has a plurality of shaft convex portions that protrude from the lock body by a predetermined length and are arranged along the circumferential direction around the shaft body. On the other hand, the lock body has a lock projection that protrudes a predetermined length on the enlarged diameter side. When the rotating shaft is locked, the lock body engages with the enlarged diameter portion by inserting the lock convex portion of the lock body between the axial convex portions adjacent to each other in the circumferential direction of the enlarged diameter portion. Thereby, in the rotating shaft, the shaft convex portion of the enlarged diameter portion abuts in the circumferential direction against the lock convex portion of the lock body that cannot rotate, and further rotation is prevented. Thus, by engaging the lock body having the lock protrusion with the diameter-enlarged portion having the plurality of shaft protrusions, the rotation shaft can be easily locked.

  According to a third aspect of the present invention, in the vehicle parking mechanism according to the second aspect, the lock convex portion 55 is disposed along the circumferential direction of the inner case portion 31A, and a plurality of shaft convex portions 3c corresponding to the plurality of shaft convex portions 3c. It is characterized by comprising a locking projection.

  According to this configuration, the lock protrusions of the lock body are arranged along the circumferential direction of the inner case part, and are constituted by a plurality of lock protrusions corresponding to the plurality of shaft protrusions. The lock body engages with the enlarged diameter portion in such a state that the portion engages with the plurality of axial convex portions of the enlarged diameter portion. Thereby, the rotating shaft which has an enlarged diameter part can be locked stably.

  According to a fourth aspect of the present invention, in the vehicle parking mechanism according to the second or third aspect, the rotating body 42 is formed in a ring shape surrounding the outer periphery of the inner case portion 31A, along the radial direction of the inner case portion, and A rotating body main body 47 having a flat rotating body flat surface (flat surface 47a) facing the lock body 43, and a rotating body provided so as to protrude from the rotating body flat surface of the rotating body main body to the lock body side by a predetermined length. And a pressing cam 48 that presses the lock body toward the enlarged diameter portion, and the lock body includes a lock body flat surface (flat surface 53a) facing the rotation body flat surface of the rotation body main body. Further, it further includes an engagement recess 57 that is continuous with the flat surface of the lock body, opens to the rotating body side, and is formed in a complementary manner to the pressing cam.

  According to this configuration, the rotating body includes a ring-shaped rotating body main body that surrounds the outer periphery of the inner case portion, and a pressing cam that protrudes from the rotating body flat surface of the rotating body main body to the lock body side by a predetermined length. Yes. On the other hand, the lock body has a lock body flat surface facing the rotating body flat surface of the rotating body main body, and an engaging recess that is connected to the flat surface of the lock body and is formed complementarily to the pressing cam of the rotating body. ing. When the rotating body main body of the rotating body rotates in the circumferential direction of the inner case portion, the pressing cam engaged with the engaging concave portion of the locking body also rotates in the same manner. It moves from the engagement recess to the lock body flat surface side. Thereby, the lock body flat surface is pressed by the pressing cam of the rotating body, and the lock body moves to the enlarged diameter portion side. As described above, the lock body can be easily moved to the diameter-enlarged portion side of the rotation shaft only by rotating the rotation body main body of the rotation body.

  According to a fifth aspect of the present invention, in the vehicle parking mechanism according to the fourth aspect, the rotating body main body 47 is formed with an engaging groove 47a that opens to the lock body 43 side and extends in the circumferential direction of the rotating body main body. The pressing cam 48 is configured to be movable along the engaging groove with respect to the rotating body main body. When the rotating bodies 42 and 61 press the lock body 43 as the rotating body main body rotates, It further includes a pressing cam spring (ring spring 49, coil spring 62) that urges the pressing cam in a direction to follow the rotating body.

  According to this structure, the engaging body extending in the circumferential direction is formed in the rotating body of the rotating body, and the pressing cam is configured to be movable along the engaging groove. The rotating body has a pressing cam spring that urges the pressing cam in a direction to follow the rotating body main body as the rotating body main body rotates. Thus, when the rotating body main body rotates, the pressing cam moves in the same direction as the rotating body main body by the biasing force of the pressing cam spring, and presses the lock body toward the enlarged diameter portion.

  Also, in this case, when the tip of the lock projection of the lock body that has moved to the enlarged diameter portion comes into contact with the tip of the shaft projection of the enlarged diameter portion while the rotary body is turning by a predetermined angle, Further movement of the body toward the enlarged diameter portion is prevented, and the movement of the pressing cam is also prevented by the reaction force from the lock body. However, in this case, the rotation of the rotation shaft by a minute angle by the rotational force from the wheel side cancels the contact between the lock projection and the tip of the shaft projection. Further, the pressing cam moves in the rotating direction of the rotating body by the urging force of the pressing cam spring. Thereby, the lock body is further pressed to the enlarged diameter portion side, and the lock projection engages with the enlarged diameter portion by inserting the lock projection between adjacent shaft projections. Thus, even when the tip of the lock projection of the lock body is in contact with the tip of the shaft projection of the enlarged diameter portion, immediately after that, the lock projection and the shaft projection can be engaged, A stable lock of the rotating shaft can be secured.

  The invention according to claim 6 is the vehicle parking mechanism according to claim 5, wherein the lock body 43 is formed in a ring shape surrounding the outer periphery of the inner case portion 31 </ b> A, and the engagement recess 57 is formed of the lock body. It is composed of a pair of engaging recesses arranged on opposite sides in the radial direction, and the pressing cams 48 are arranged on the opposite sides in the radial direction of the rotating body main body 47 and engage with the pair of engaging recesses, respectively. It is characterized by comprising a pair of possible pressing cams.

  According to this configuration, the lock body formed in the ring shape is provided with the pair of engaging recesses on the opposite sides in the radial direction. On the other hand, the pair of pressing cams assembled to the rotating body main body are arranged on opposite sides in the radial direction of the rotating body main body, and are configured to be engageable with the pair of engaging recesses, respectively. Thus, since the lock body is pressed by the pair of pressing cams positioned on the opposite sides in the radial direction, the pressing can be performed with good balance and stability.

  According to a seventh aspect of the present invention, in the vehicle parking mechanism according to the sixth aspect, each of the pair of pressing cam springs extends along the outer periphery of the rotating body main body 47 and is on the outer peripheral surface of the rotating body main body. It is arranged in a ring shape, one end is fixed to a predetermined position on the outer peripheral surface of the rotating body main body, and the other end is composed of a pair of ring springs 49 and 49 fixed to one of a pair of pressing cams. Features.

  According to this configuration, each of the pair of pressing cam springs is configured by a ring spring arranged in a ring shape on the outer peripheral surface of the rotating body main body, and one end portion of the ring spring is formed on the outer peripheral surface of the rotating body main body. The other end is fixed to one pressing cam at a predetermined position. When the rotating body main body that presses the lock body rotates in a direction that increases the diameter of the ring spring, an urging force due to the restoring force of the ring spring acts on the pressing cam. Therefore, it is possible to easily follow the pressing cam in the rotating direction of the rotating body body using the ring spring.

  According to an eighth aspect of the present invention, in the vehicle parking mechanism according to the sixth aspect, each of the pair of pressing cam springs extends along the engaging groove 47b of the rotating body main body 47 and is accommodated in the engaging groove. One end portion is held at a predetermined position of the engaging groove, and the other end portion is constituted by a pair of coil springs 62 and 62 abutted against one of the pair of pressing cams.

  According to this configuration, each of the pair of pressing cam springs is configured by the coil spring that extends along the engaging groove of the rotating body main body and is accommodated in the engaging groove, and one end of the coil spring is engaged. It is held at a predetermined position of the mating groove, and the other end is in contact with one pressing cam. When the rotating body main body at the time of pressing the lock body rotates in such a direction as to compress the coil spring, an urging force due to the restoring force of the coil spring acts on the pressing cam. Therefore, it is possible to easily follow the pressing cam in the rotating direction of the rotating body body using the coil spring.

  The invention according to claim 9 is the vehicle parking mechanism according to any one of claims 6 to 8, further comprising a lock body biasing spring 59 that biases the lock body 43 toward the rotating body 42. It is characterized by.

  According to this configuration, when the parking lock is released, the rotating body is rotated to the original position before the parking lock, etc., thereby releasing the pressing of the locking body by the pressing cam. Thereby, the lock body moves to the rotating body side by the biasing force of the lock body biasing spring and returns to the original position. That is, the lock body is separated from the enlarged diameter portion of the rotating shaft, and the engagement with the enlarged diameter portion is released. In this way, simply by rotating the rotating body, it is possible to release the engagement of the lock body with respect to the enlarged diameter portion and easily lock the rotating shaft.

It is a figure which shows typically the parking mechanism by one Embodiment of this invention with the drive unit of the vehicle to which this is applied. It is a figure which shows a parking mechanism with the rotating shaft which should be locked, (a) is a perspective view, (b) is a longitudinal cross-sectional view. It is a perspective view which decomposes | disassembles and shows the parking mechanism of FIG. It is a figure which shows the case of a parking mechanism, (a) is a perspective view, (b) is a figure when it sees from the right side. (A) is a perspective view which shows a rotary body, (b) is a perspective view which shows a pair of press cam, (c) is a perspective view which shows a pair of ring spring. It is a perspective view which shows a lock body, (a) has shown the state when it sees from the right side, (b) has shown the state when it sees from the left side. It is a perspective view which shows partially the rotating shaft locked by a lock body, (a) shows the state when it sees from the right side, (b) has shown the state when it sees from the left side. FIGS. 2A and 2B correspond to FIGS. 2A and 2B, respectively, and show the parking mechanism at the time of parking lock. (A) is a perspective view which shows the modification of a rotary body, (b) is a perspective view which decomposes | disassembles and shows the rotary body. It is explanatory drawing for demonstrating operation | movement of the parking mechanism provided with the rotation body of FIG. 9 in order, (a) is the state before the action | operation of a parking mechanism, (b) is the state of the lock convex part of a lock body after an operation start. The state when the tip abuts against the tip of the shaft convex portion of the enlarged diameter portion, (c) shows the state when the locking of the rotating shaft by the parking mechanism is completed.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows a parking mechanism according to an embodiment of the present invention together with a vehicle drive unit to which the parking mechanism is applied. As shown in the figure, the parking mechanism 1 is applied to a four-wheel vehicle or the like that drives left and right wheels WL and WR with a motor, and makes the rotation shaft 3 of the drive unit 2 of the vehicle V unrotatable during parking. It is something to lock.

  As shown in FIG. 1, the drive unit 2 includes a motor 4 as a drive source for running the vehicle V, and a reduction gear mechanism 5 that transmits the power of the motor 4 to the left and right wheels WL and WR. The motor 4 includes a rotor 4a and a stator 4b, and a sun gear 11 to be described later is provided at an end portion (left end portion in FIG. 1) of a hollow motor shaft 4c that rotates integrally with the rotor 4a.

  The reduction gear mechanism 5 includes two first and second planetary gear mechanisms 10 and 20 provided in a state where they are arranged side by side. Specifically, the first planetary gear mechanism 10 includes a sun gear 11 provided on the motor shaft 4 c of the motor 4, a plurality (only two are shown in FIG. 1) of pinion gears 12 that mesh with the sun gear 11, and these pinion gears 12. The ring gear 13 is provided so as to be fixed in a covered state and meshes with the pinion gears 12, and the carrier 14 supports all the pinion gears 12 in a rotatable and revolving manner.

  On the other hand, the second planetary gear mechanism 20 includes a sun gear 21 provided at the center of the carrier 14 of the first planetary gear mechanism 10, a plurality of (only two shown in FIG. 1) pinion gears 22, The ring gear 23 is provided so as to be stationary while covering the pinion gears 22 and meshes with the pinion gears 22, and the carrier 24 supports all the pinion gears 22 in a rotatable and revolving manner. The carrier 24 is common to the later-described enlarged diameter portion 3b of the rotating shaft 3 in the drive unit 2.

  The rotating shaft 3 has a predetermined diameter and a shaft main body 3a extending in the left-right direction of the vehicle V, and has a predetermined diameter larger than the shaft main body 3a and is provided so as to be rotatable integrally with the shaft main body 3a. And a diameter portion 3b. A shaft main body 3a extending rightward from the enlarged diameter portion 3b penetrates the carrier 14 and the motor shaft 4c, and a right wheel WR is attached to the tip portion. On the other hand, the shaft main body 3a extending to the left from the enlarged diameter portion 3b penetrates the parking mechanism 1, and a left wheel WL is attached to the tip portion. In addition, in FIG. 1, although the shaft main body 3a extended from the enlarged diameter part 3b to the left and right is shown with the simplified single line, the actual shaft main body 3a is comprised by the some axis | shaft arrange | positioned on the same straight line. Yes.

  As shown in FIG. 1, a parking mechanism 1 is provided on the left side of the drive unit 2. FIG. 2 shows the parking mechanism 1 including a part of the rotating shaft 3 of the drive unit 2, and FIG. 3 shows the parking mechanism 1 in an exploded manner. As shown in both figures, the parking mechanism 1 is concentrically arranged and extends a predetermined length in the length direction of the central axis C (hereinafter simply referred to as “axial direction”), both of which are cylindrical. A case 31 having an inner case portion 31A and an outer case portion 31B that are formed, and a lock unit 32 that is disposed between the inner case portion 31A and the outer case portion 31B and locks the rotary shaft 3 are provided. Yes.

  FIG. 4 shows the case 31, where (a) is a perspective view and (b) is a view when viewed from the right side. In FIG. 3, for convenience of illustration, the inner case portion 31 </ b> A and the outer case portion 31 </ b> B are shown separately from each other, but they are connected to each other at the left end portion and are integrally formed.

  As shown in FIG. 2 (b), the inner case portion 31A of the case 31 has a predetermined diameter that is larger than the diameter of the shaft body 3a of the rotating shaft 3 and smaller than the diameter of the enlarged diameter portion 3b. The part 31B has a predetermined diameter larger than the diameter of the enlarged diameter part 3b. As shown in FIGS. 3 and 4, the inner case portion 31 </ b> A includes a large-diameter cylindrical portion 33 having the largest outer diameter, and a medium-diameter cylindrical portion adjacent to and adjacent to the large-diameter cylindrical portion 33. 34, a spline cylindrical portion 35 having a plurality of grooves adjacent to each other, each extending along the axial direction and formed along the circumferential direction of the outer peripheral surface, and having the smallest outer diameter A small-diameter cylindrical portion 36.

  As shown in FIG. 2B, a bearing 37 is attached to the inner peripheral portion of the small diameter cylindrical portion 36 on the inner side of the inner case portion 31A, and a rotating shaft that penetrates the inside of the case 31 to the bearing 37. 3 shaft body 3a is rotatably supported.

  On the other hand, the outer case portion 31B is formed in a cylindrical shape having a constant diameter slightly larger than the diameter of the enlarged diameter portion 3b of the rotating shaft 3 over the entire axial direction. In addition, the upper and lower radial protrusions 56 and 56 of the lock body 43 (described later) are supported at a predetermined position near the right end above and below the inner peripheral surface of the outer case portion 31B, and the lock body 43 is fixed to the length of the case 31. An upper guide part 38 and a lower guide part 39 for guiding in the vertical direction are provided. The upper guide portion 38 is provided such that the guide surfaces 38a and 38a face each other with a predetermined distance. Similarly, the lower guide portion 39 also has the guide surfaces 39a and 39a face each other with a predetermined distance. Is provided.

  As shown in FIGS. 2 and 3, the lock unit 32 of the parking mechanism 1 includes an actuator motor 41 (motor), a rotating body 42 that is rotated by the actuator motor 41, and the rotation of the rotating body 42. Accordingly, a lock body 43 that moves along the length direction of the inner case portion 31 </ b> A and can be engaged with the enlarged diameter portion 3 b of the rotary shaft 3 is provided.

  As shown in FIG. 2B, the actuator motor 41 is provided between the large diameter cylindrical portion 33 of the inner case portion 31A and the outer case portion 31B. Specifically, the actuator motor 41 includes a rotor 41a that can rotate in the circumferential direction of the inner case portion 31A, and a stator 41b that is disposed on the outer peripheral side of the rotor 41a. A connecting member 45 for connecting the rotor 41a and the rotating body 42 is fixed to the rotor 41a.

  The connecting member 45 is made of a thin metal plate or the like, and is formed in a two-stage cylindrical shape having two diameters, a small diameter and a large diameter. Specifically, the connecting member 45 has a cylindrical small diameter portion 45a having an outer diameter substantially the same as the inner diameter of the rotor 41a and fixed to the inner surface of the rotor 41a, and is larger than the diameter of the small diameter portion 45a and The rotating body 42 has a cylindrical large-diameter portion 45b having an inner diameter that is substantially the same as the outer diameter of a rotating body main body 47, which will be described later. Has been.

  The entire outer peripheral surface of the left end portion of the rotating body 42 is integrally engaged with the inner peripheral surface of the large diameter portion 45b, and the left end portion of the rotating body 42 is the outer peripheral surface of the medium diameter cylindrical portion 34 of the inner case portion 31A. It is rotatably supported through a bearing 46 fixed to the base. Thereby, the rotating body 42 rotates integrally with the rotor 41 of the actuator motor 41. The large-diameter portion 45b of the connecting member 45 is provided with two protrusions 45c spaced apart in the circumferential direction at predetermined positions on the outer peripheral surface thereof, and the outer case is interposed between these protrusions 45, 45. The tip of the detent spring 40 fixed to the portion 31B is fitted. Thereby, when the actuator motor 41 is not energized, the rotating body 42 can be prevented from rotating freely.

  FIG. 5A shows the rotating body 42. The rotating body 42 is arranged on the opposite side in the radial direction of the right side surface of the rotating body main body 47 and a ring-shaped rotating body main body 47 provided so as to surround the outer periphery of the inner case portion 31A. A pair of pressing cams 48, 48 that are movably provided along the circumferential direction of each of these are formed in a substantially ring shape, with one end 49 a on the rotating body 47 and the other end 49 b on each pressing cam 48. The ring springs 49 and 49 (pressing cam springs) are engaged with each other. In the following description, in order to distinguish the two pressing cams 48, 48, the front and rear pressing cams 48 are appropriately combined with the reference numerals 48A and 48B, respectively, in FIGS. 2 and 5A. It shall be attached.

  As shown in FIG. 2B, the rotating body main body 47 is formed such that the right half in the axial direction is thick, while the left half is thin. 3 and 5, the right side surface of the rotating body main body 47 has a flat flat surface 47a (rotating body flat surface) orthogonal to the axial direction. An engagement groove 47b that is open to the right and extends continuously in the circumferential direction is formed. Further, on the outer peripheral surface of the rotating body 47, two locking holes 47c and 47c (FIG. 3) for locking the respective one end portions 49a of the ring springs 49 and 49 at predetermined positions opposite to each other in the radial direction. 5 (a), only one is shown). Further, on the outer peripheral surface of the left end portion of the rotating body main body 47, a predetermined length extends along the axial direction and is disposed along the circumferential direction, and engages with the inner peripheral surface of the large-diameter portion 45b of the connecting member 45. A large number of convex portions 47d are provided.

  As shown in FIGS. 5A and 5B, each pressing cam 48 is formed in a crescent shape having the same curvature as the rotating body main body 47 and extending a predetermined length, and gradually from both ends toward the center. The central portion is formed to have a predetermined height. Further, a U-shaped locking groove 48a that opens to the right in a state of crossing the pressing cam 48 is formed at the center of the pressing cam 48, and the ring spring 49 has a ring groove 49a. The other end 49b is locked. Further, on the back surface (left surface in FIG. 5) of the pressing cam 48, there is provided an engaging convex portion 48b that extends over the entire length direction and engages with the engaging groove 47b of the rotating body 47. It has been.

  Each ring spring 49 is made of a metal wire or the like, is formed in a ring shape having a diameter that is slightly larger than the outer diameter of the rotating body 47, and both end portions 49a and 49b are bent inward. Further, the ring spring 49 is assembled to the outer peripheral surface of the rotating body main body 47 with a slight gap, and is locked with one end portion 49 a inserted into a predetermined locking hole 47 c of the rotating body main body 47. The other end 49b is locked in the locking groove 48a of the pressing cam 48 disposed near the locking hole 47c.

  In the rotating body 42 configured as described above, when the rotating body main body 47 rotates around the inner case portion 31 </ b> A, the pressing cams 48 rotate in the rotating direction of the rotating body main body 47 via the ring springs 49. It moves substantially integrally with the rotating body 47 so as to follow. Further, as will be described later, when the rotation body main body 47 is rotated in a predetermined direction (counterclockwise in FIG. 5A), the movement of each pressing cam 48 is blocked by the lock body 43. 49 spreads so that the diameter becomes large. Thereby, the urging force due to the restoring force of the ring spring 49 acts on each pressing cam 48 in the direction in which the rotating body main body 47 rotates.

  FIG. 6 shows the lock body 43, and (a) and (b) show states when viewed from the right side and the left side, respectively. As shown in the figure, the lock body 43 includes a cylindrical portion 51 having a predetermined diameter, and a right flange portion 52 and a left flange portion 53 provided at the right end portion and the left end portion in the axial direction of the cylindrical portion 51, respectively. These are integrally formed.

  The cylindrical part 51 has an inner diameter that is substantially the same as the outer diameter of the inner case part 31A. Further, the inner peripheral surface of the cylindrical portion 51 is provided with a spline engaging portion 51a that extends along the axial direction and has a large number of convex portions formed along the circumferential direction. As shown in FIG. 2B, the spline engaging portion 51a is engaged with the spline cylindrical portion 35 of the inner case portion 31A.

  Further, as shown in FIG. 6A, the right flange portion 52 has a larger outer diameter than the cylindrical portion 51 and a predetermined thickness, and a plurality of outer peripheral portions (in this embodiment). 4) A radial protrusion 52a that protrudes in the radial direction from the other portions is formed at the location. And these diameter protrusion parts 52a protrude rightward, and a total of four lock convex parts 55 are provided. Each of the lock protrusions 55 is formed in a square frustum shape having a predetermined size.

  Further, as shown in FIG. 6, the left flange portion 53 has a larger outer diameter than the cylindrical portion 51 and is formed relatively thick, and has a diameter larger than that of the other portions above and below the outer peripheral portion. A radial protrusion 56 is formed that protrudes in the direction and to the same extent as the radial protrusion 52 a of the right flange portion 52. These radial protrusions 56 are located between two predetermined radial protrusions 52 a and 52 a adjacent to the right flange portion 52 in the circumferential direction of the lock body 43. Each radial protrusion 56 of the left flange portion 53 has an arc surface 56a having a predetermined length in the circumferential direction of the left flange portion 53, and parallel surfaces 56b formed in parallel at both ends thereof. , 56b. The parallel surfaces 56b and 56b of the upper and lower radial protrusions 56 and 56 are in sliding contact with the guide surfaces 38a and 38a of the upper guide 38 and the guide surfaces 39a and 39a of the lower guide 39, respectively.

  Further, as shown in FIG. 6B, the left flange portion 53 is connected to a flat surface 53a (locking body flat surface) facing the flat surface 47a of the rotating body main body 47 and is opened to the rotating body 42 side. A pair of engaging recesses 57 and 57 formed in a complementary manner to the pressing cam 48 are formed. Specifically, both the engagement recesses 57 and 57 are provided between the upper and lower radial protrusions 56 and 56 of the left flange portion 53 and on the opposite sides in the radial direction of the left flange portion 53. In addition, each engagement recess 57 is formed such that the thickness of the left flange portion 53 gradually decreases toward the center, that is, the depth of the engagement recess 57 increases.

  In addition, on the outer periphery of the cylindrical portion 51 of the lock body 43, there are four ribs 58 (two in FIG. 6) extending in the axial direction between the respective radial protrusions 52a of the right flange portion 52 and the left flange portion 53. Only shown). With these ribs 58, the lock body 43 has high rigidity in the axial direction and the circumferential direction.

  The lock body 43 configured as described above is configured so that it cannot rotate in the circumferential direction of the case 31 by the spline cylindrical portion 35 of the inner case portion 31A, and the upper guide portion 38 and the lower guide portion 39 of the outer case portion 31B. 31 is movable in the length direction (axial direction). Moreover, when the lock body 43 moves to the enlarged diameter part 3b side of the rotating shaft 3, it engages with the enlarged diameter part 3b.

  FIG. 7 partially shows the rotary shaft 3 locked by the lock body 43, and (a) and (b) show states when viewed from the right side and the left side, respectively. As shown in the figure, on the left side surface of the enlarged diameter portion 3b, there are eight axial convex portions 3c that protrude leftward and are arranged along the circumferential direction at equal angles around the shaft main body 3a. Is provided. Each of the axial convex portions 3c is formed in a square frustum shape having a predetermined size. With each lock convex part 55 of the lock body 43 inserted between the axial convex parts 3c and 3c adjacent in the circumferential direction of the enlarged diameter part 3b, the lock body 43 engages with the enlarged diameter part 3b. The rotating shaft 3 is locked.

  As shown in FIGS. 2 and 3, two lock body urging members for urging the lock body 43 toward the left rotation body 42 are respectively provided to the right of the upper and lower radial protrusions 56 of the lock body 43. Springs 59, 59 are provided. Each lock body urging spring 59 is formed of a coil spring, and one end portion (left end portion) abuts on the right side surface of the radial protrusion 56 of the lock body 43, and the other end portion (right end portion) is an inner portion of the outer case portion 31B. It is being fixed to the spring holding member 30 fixed to the surrounding surface.

  Next, the operation of the parking mechanism 1 configured as described above will be described with reference to FIGS. 2 and 8 showing the operation before and after the operation, respectively. When the vehicle V is parked and the vehicle V is stopped by the driver, for example, when the shift lever is put in the P range, the actuator motor 41 of the parking mechanism 1 is operated, and the rotor 41a is moved at a predetermined angle ( For example, 75-90 °). Accordingly, the rotating body main body 47 of the rotating body 42 shown in FIG. 2A rotates integrally with the rotor 41a in the counterclockwise direction in FIG. In this case, the two pressing cams 48, 48 of the rotating body 42 follow the rotating body main body 47 via the respective ring springs 49 and rotate in the same direction (counterclockwise in FIG. 2A). The lock body 43 is pressed against the right-side enlarged diameter portion 3b against the urging force of the lock body urging spring 59.

  FIGS. 8A and 8B correspond to FIGS. 2A and 2B and show a state where the lock body 43 pressed as described above is engaged with the enlarged diameter portion 3b. As shown in FIG. 8, the lock body 43 moves to the right, and each lock convex portion 55 is held in a state of being inserted between the adjacent shaft convex portions 3 c and 3 c of the enlarged diameter portion 3 b. Thereby, the axial convex part 3c of the enlarged diameter part 3b is prevented from moving in the circumferential direction by the lock convex part 55 of the lock body 43, and as a result, the rotary shaft 3 is locked so as not to rotate.

  In order to unlock the rotary shaft 3, the rotor 41a of the actuator motor 41 is rotated in the opposite direction and at the same angle, thereby rotating the rotating body 42 clockwise to the original position. return. Thereby, the lock body 43 is urged | biased by the left rotation body 42 side by the upper and lower lock body urging | biasing springs 59 and 59, and returns to the original position.

  As described above in detail, according to the present embodiment, the actuator motor 41, the rotating body between the inner case portion 31A and the outer case portion 31B around the shaft main body 3a with respect to the rotating shaft 3 to be locked. 42 and the lock body 43 are arranged, and the lock body 43 is engaged with the enlarged diameter portion 3b of the rotation shaft 3 by the rotation of the rotation body 42. Therefore, the parking mechanism 1 is secured while ensuring the smooth lock of the rotation shaft 3. Can be made compact in the radial direction of the rotary shaft 3. Further, when the parking lock is performed, the lock body 43 is engaged with the enlarged diameter portion 3b in a state where the lock convex portion 55 of the lock body 43 and the axial convex portion 3c of the enlarged diameter portion 3b are engaged with each other. And can be locked stably.

  FIG. 9 shows a modification of the rotating body. The rotating body 61 uses a coil spring 62 (a spring for pressing cam) instead of the ring spring 49 that urges each pressing cam 48 against the rotating body 42, and the engaging groove of the rotating body main body 47. The only difference is that a partition plate 47e is provided on 47b and the locking groove 48a of each pressing cam 48 is omitted. Therefore, in the following description, the same components as those of the rotating body 42 are denoted by the same reference numerals in the rotating body 61, and the description thereof is omitted.

  As shown in FIG. 9B, the ring-shaped engagement groove 47b of the rotating body main body 47 is provided with two partition plates 47e and 47e on opposite sides in the radial direction. The rotating body 47 is assembled with a pressing cam 48 and a coil spring 62 between the partition plates 47e and 47e of the engaging groove 47b. More specifically, each pressing cam 48 is assembled to the rotating body main body 47 in a state where the engaging convex portion 48b is inserted into the engaging groove 47b and is in contact with one partition plate 47e. The coil spring 62 is accommodated in the engagement groove 47b in a state (natural length) extending in a circular arc shape between the corresponding pressing cam 48 and the other partition plate 47e.

  The rotating body 61 configured in this way also acts in the same manner as the rotating body 42 using the ring spring 49 described above.

  Here, referring to FIG. 10, in the parking mechanism 1 provided with the rotating body 61, when the parking lock is performed, the tip of the lock projection 55 of the lock body 43 is the tip of the shaft projection 3c of the enlarged diameter portion 3b. The operation of the parking mechanism 1 when abutting on the vehicle will be described. FIG. 10 shows a longitudinal section of the parking mechanism 1 in the upper stage, and shows a state when the rotating body 61 is viewed from the lock body 43 side in the lower stage.

  FIG. 10A shows a state before the parking mechanism 1 is activated. From this state, the actuator motor 41 operates, and the rotating body main body 47 of the rotating body 61 rotates by a predetermined angle (for example, 75 ° to 90 °) in the counterclockwise direction in the lower part of FIG. In this case, both the pressing cams 48, 48 of the rotating body 61 move following the rotation of the rotating body main body 47, and press the lock body 43 toward the right diameter enlarged portion 3b.

  FIG. 10B shows a state in which the lock body 43 is moved to the enlarged diameter portion 3b side by the above-described pressing, and the tip of the lock convex portion 55 comes into contact with the tip of the shaft convex portion 3c. In this case, the lock body 43 is prevented from further moving, and the reaction force from the lock body 43 also prevents the movement of both the pressing cams 48, 48. In this case, each coil spring 62 in the engaging groove 47b of the rotating body main body 47 is compressed by the corresponding engaging convex portion 48b of the pressing cam 48 and the partition plate 47e.

  From the above state, the rotation shaft 3 is rotated by a minute angle by the rotational force from the wheels WL and WR, so that the contact between the lock projection 55 and the tip of the shaft projection 3c is released. Then, as shown in the lower part of FIG. 10 (c), both the pressing cams 48, 48 are caused to rotate in the rotational direction of the rotating body main body 47 (the lower part of FIG. (Counterclockwise at). Thereby, as shown in the upper part of FIG. 10 (c), the lock body 43 is further pressed toward the enlarged diameter portion 3b, and each lock convex portion 55 is inserted between the adjacent shaft convex portions 3c, 3c. The lock body 43 engages with the enlarged diameter portion 3b.

  Thus, even when the front end of the lock convex portion 55 of the lock body 43 comes into contact with the front end of the shaft convex portion 3c of the enlarged diameter portion 3b, immediately after that, the lock convex portion 55 and the shaft convex portion 3c are engaged with each other. And a stable lock of the rotary shaft 3 can be secured.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, the case where the parking mechanism 1 of the present invention is applied to the drive unit 2 of the vehicle V driven by the motor 4 has been described. Is possible. In the embodiment, the lock body 43 of the parking mechanism 1 is provided with a plurality of lock projections 55 and the diameter-expanded portion 3b of the rotary shaft 3 is provided with a plurality of shaft projections 3c. And the shape and number of the axial convex part 3c are not specifically limited. If the lock body 43 engages with the enlarged diameter portion 3b and the rotation shaft 3 can be locked in a non-rotatable manner, various engagement portions of the lock body 43 and the enlarged diameter portion 3b are employed. It is possible.

  Further, in the embodiment, the two pressing cams 48, 48 are used in the rotating bodies 42, 61, but the number of these is not particularly limited, and for example, one or three or more pressing cams are adopted. It is also possible to do.

  In addition, the detailed configurations of the parking mechanism 1, the rotating bodies 42 and 61, and the lock body 43 shown in the embodiment are merely examples, and can be appropriately changed within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Parking mechanism 2 Drive unit 3 Rotating shaft 3a Shaft main body 3b Expanded diameter part 3c Shaft convex part 31 Case 31A Inner case part 31B Outer case part 32 Lock unit 41 Actuator motor (motor)
41a rotor 42 rotating body 43 lock body 47 rotating body main body 47a flat surface (rotating body flat surface)
47b Engaging groove 48 Pressing cam 49 Ring spring (pressing cam spring)
49a Ring spring one end 49b Ring spring other end 53 Lock body left flange 53a Flat surface (lock body flat surface)
55 Locking convex part 57 Engaging concave part 59 Locking body biasing spring 61 Rotating body 62 Coil spring (spring for pressing cam)
V Vehicle WL Left wheel WR Right wheel

Claims (9)

A parking mechanism for a vehicle that locks a rotation shaft for rotationally driving the wheels of the vehicle in a non-rotatable manner when the vehicle is parked.
The rotating shaft has a predetermined diameter and a shaft main body extending in the left-right direction between the left and right wheels, and a diameter-increased portion having a larger diameter than the shaft main body and rotatably provided integrally with the shaft main body. And
A cylindrical inner case portion having a diameter smaller than the diameter of the enlarged diameter portion, the shaft main body being inserted, and rotatably supporting the shaft main body,
The outer case portion having a diameter larger than the diameter of the enlarged diameter portion, provided to cover the outer periphery of the inner case portion, and an outer case portion configured integrally with the inner case portion;
A motor having a rotor provided between the inner case portion and the outer case portion and rotatable about the inner case portion;
Between the inner case portion and the outer case portion, a rotating body that is rotatably provided in the circumferential direction of the inner case portion, and rotates with the rotation of the rotor,
Between the inner case portion and the outer case portion, in contact with the rotating body and opposed to the enlarged diameter portion, the inner case portion cannot rotate in the circumferential direction of the inner case portion and the length direction of the inner case portion A lock body that is movable between the rotating body and the enlarged diameter portion and engages with the enlarged diameter portion.
With
When the vehicle is parked, the rotating body is rotated by the motor, so that the lock body is moved to the enlarged-diameter portion side and engaged with the enlarged-diameter portion. A vehicle parking mechanism characterized by locking. Each of the enlarged diameter portions protrudes a predetermined length toward the lock body, and has a plurality of axial convex portions arranged along the circumferential direction around the shaft main body,
The lock body protrudes a predetermined length toward the enlarged diameter portion, and engages with the enlarged diameter portion by inserting between the shaft convex portions adjacent to each other in the circumferential direction when locking the rotating shaft. The vehicle parking mechanism according to claim 1, further comprising a lock protrusion.   The vehicle according to claim 2, wherein the lock convex portion is arranged along a circumferential direction of the inner case portion and includes a plurality of lock convex portions corresponding to the plurality of axial convex portions. Parking mechanism. The rotating body is
A rotating body main body formed in a ring shape surrounding the outer periphery of the inner case portion, and having a flat rotating body flat surface along the radial direction of the inner case portion and facing the lock body;
A pressing cam that is provided so as to protrude from the flat surface of the rotating body to the lock body side by a predetermined length, and that presses the lock body toward the enlarged-diameter portion as the rotating body rotates;
Have
The lock body is
A locking body flat surface facing the rotating body flat surface of the rotating body main body;
An engaging recess formed in a complementary manner to the pressing cam, and continuous to the flat surface of the lock body and opened to the rotating body side;
The vehicle parking mechanism according to claim 2, further comprising: The rotating body main body is formed with an engagement groove that opens to the lock body side and extends in the circumferential direction of the rotating body main body.
The pressing cam is configured to be movable along the engagement groove with respect to the rotating body main body,
The rotating body further includes a pressing cam spring that urges the pressing cam in a direction to follow the rotating body body when the lock body is pressed as the rotating body body rotates. The vehicle parking mechanism according to claim 4. The lock body is formed in a ring shape surrounding the outer periphery of the inner case portion,
The engagement recess is composed of a pair of engagement recesses arranged on opposite sides in the radial direction of the lock body,
The said press cam is arrange | positioned at the mutually opposite side in the radial direction of the said rotary body main body, and is comprised by a pair of press cam which can each be engaged with a pair of said engagement recessed part, It is characterized by the above-mentioned. 5. A parking mechanism for a vehicle according to 5.   Each of the pair of pressing cam springs extends along the outer periphery of the rotating body main body, is arranged in a ring shape on the outer peripheral surface of the rotating body main body, and one end thereof is a predetermined portion of the outer peripheral surface of the rotating body main body. The vehicle parking mechanism according to claim 6, wherein the vehicle parking mechanism is configured by a pair of ring springs fixed to a position and having the other end fixed to one of the pair of pressing cams.   Each of the pair of pressing cam springs extends along the engagement groove of the rotating body main body, is accommodated in the engagement groove, one end is held at a predetermined position of the engagement groove, and the other end The vehicle parking mechanism according to claim 6, wherein the portion includes a pair of coil springs that are in contact with one of the pair of pressing cams.   The vehicle parking mechanism according to claim 6, further comprising a lock body biasing spring that biases the lock body toward the rotating body.

Images