Parking Mechanism

Abstract

To provide a parking mechanism improved in durability that can prevent a claw of a parking pole from excessively meshing with a parking gear.SOLUTION: A parking mechanism 1 comprises: a parking gear 10 rotatably supported on a rotary shaft 3 that rotates accompanying output of power; and a parking pole 20, supported to be swingable in a direction in which the pole approaches and separates with respect to the parking gear 10 with a support shaft 21 arranged adjacently to the parking gear 10 as a center, which has a claw 23 that can mesh with the parking gear 10 accompanying swinging thereof. The parking pole 20 has, at a position shifted in a radial direction of the swinging with respect the claw 23, a protruding part 25 formed to protrude towards the same direction as the claw 23. In a state where the parking pole 20 is made to approach the parking gear 10, the protruding part 25 contacts a tooth tip 12. In a state where an air gap 30 is formed between the claw 23 and a tooth bottom 13, the parking gear 10 is so as not to turn.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a parking mechanism for an automatic transmission. [Background technology]

[0002] 2. Description of the Related Art Conventionally, automatic transmissions (such as continuously variable transmissions (CVTs) and stepped automatic transmissions (ATs)) mounted on vehicles or the like are provided with a parking mechanism (see, for example, Patent Document 1).

[0003] The parking mechanism described in the above-mentioned Patent Document 1 is said to include a parking gear attached to the output shaft of an automatic transmission, and a parking pole having a claw that can mesh with the parking gear. In addition, in the parking mechanism described in Patent Document 1, the parking pole is biased by a spring or the like in a direction away from the parking gear, and the claw and the parking gear are separated and do not mesh until the detent lever (corresponding to a shift lever) is operated to the parking state (corresponding to the parking range). In addition, in the parking mechanism described in Patent Document 1, when the detent lever is operated to the parking state, the parking pole swings toward the parking gear against the biasing force of the spring, and the claw meshes with the parking gear. As a result, the parking gear is locked, and the vehicle is kept in a parked state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-175349 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in a parking mechanism such as that described in Patent Document 1, for example, there are cases where the driver mistakenly operates the shift lever to the parking range before the vehicle comes to a complete stop. In such a case, the claw of the parking pole is bounced off the parking gear and repeats small swings, preventing it from engaging with the parking gear. However, in the parking mechanism described in Patent Document 1, the claw bounced off the parking gear moves wildly due to the repulsive force and comes into contact (deeply) with the tooth bottom (bottom of the gear teeth) of the parking gear. Bite In such cases, a strong load is applied to the claws, parking poles, and parking gear, which can cause damage to them. For this reason, in conventional parking mechanisms, it is necessary to increase the rigidity of the parking poles and the strength of the claws and parking gear, which results in high costs.

[0006] Therefore, an object of the present invention is to provide a parking mechanism that can prevent deep engagement between the claws of the parking pole and the parking gear, and can improve the durability of the parking pole and the parking gear. [Means for solving the problem]

[0007] (1) The parking mechanism of the present invention, which is provided to solve the above-mentioned problems, is a parking mechanism for parking a vehicle, and includes a parking gear rotatably supported on a rotating shaft that rotates directly or indirectly in response to the output of power, a support shaft disposed adjacent to the parking gear, and a support shaft supported so as to be swingable around the support shaft in a direction approaching or receding from the parking gear, and the parking mechanism is moved relative to the parking gear as the support shaft swings. Biteand a parking pole having a claw that can engage with the claw, the parking pole having a protruding portion formed to protrude in the same direction as the claw at a position offset in the swing radius direction from the claw, and when the parking pole is brought close to the parking gear, the protruding portion abuts against the tip of the teeth of the parking gear, and when a gap is formed between the claw and the bottom of the teeth of the parking gear, the parking gear is locked so that it cannot rotate.

[0008] In the above-mentioned parking mechanism, the parking pole has a protruding portion formed so as to protrude in the same direction as the claw at a position offset from the claw in the swing radius direction. Therefore, when the parking pole is brought close to the parking gear, the protruding portion abuts against the tooth tip of the parking gear. Therefore, the protruding portion serves as a stopper, and a gap is formed between the claw and the tooth bottom of the parking gear. As a result, when a gap is formed between the claw and the tooth bottom of the parking gear, the parking gear is locked so as not to rotate. Here, the protruding portion is formed to a protruding amount that forms a gap that does not cause the claw and the tooth bottom of the parking gear to abut. Therefore, when the parking pole swings toward the parking gear, contact (also called deep bite) between the claw and the tooth bottom of the parking gear is suppressed. Therefore, in the above-mentioned parking mechanism, it is not necessary to increase the rigidity and strength of the parking pole (including the claw) and the parking gear more than necessary, so that an increase in manufacturing costs can be suppressed. Furthermore, the parking mechanism described above can suppress contact between the claws and the tooth bottoms, thereby suppressing the generation of abnormal noise.

[0009] Here, it is possible to provide a protrusion on the case of the parking gear to prevent deep jamming. However, when a protrusion is provided on the case, deep jamming is indirectly prevented, so the number of parts increases, which may lead to stacking errors and high costs.

[0010] Therefore, in the parking mechanism of the present invention described above, the parking pole is provided with a protruding portion that directly abuts against the tooth tip of the parking gear. Therefore, the parking mechanism described above can accurately adjust the meshing amount (depth) between the claw and the parking gear. In addition, the rigidity of the parking pole described above can be easily adjusted by changing the shape and size of the protruding portion. In addition, the protruding portion can be disposed at any position as long as it can abut against the tooth tip of the parking gear when the parking pole swings toward the parking gear.

[0011] (2) In the parking mechanism of the present invention described above, the protrusion is set to protrude less in the swinging direction of the parking pole than the claw, and the distance between the center of the claw and the center of the protrusion is set to be greater than the distance between adjacent tooth tips of the parking gear and smaller than the length of the tooth tip portions.

[0012] The protruding portion in the parking mechanism described above is set to have a smaller protruding amount in the swing direction of the parking pole than the claw. Therefore, when the parking pole swings toward the parking gear, the protruding portion comes into contact with the tooth tip of the parking gear, and contact between the claw and the tooth bottom of the parking gear is suppressed. Meanwhile, the engagement between the claw and the parking gear progresses until the protruding portion comes into contact with the tooth tip of the parking gear, and the parking gear is locked so that it cannot rotate. In addition, in the parking mechanism described above, the distance between the center of the claw and the center of the protruding portion is set to be larger than the distance between the adjacent tooth tips of the parking gear and smaller than the length of the tooth tip portion. Therefore, the protruding portion reliably comes into contact with the tooth tip of the parking gear without meshing with the parking gear. As a result, the parking mechanism of the present invention can reliably suppress contact (deep engagement) between the claw and the tooth bottom of the parking gear.

[0013] (3) In the parking mechanism of the present invention described above, the protrusion may be disposed between the claw and the support shaft.

[0014] The parking mechanism described above can be made smaller by adopting such a configuration. Furthermore, the parking mechanism described above can easily change the center of gravity of the parking pole. This makes it possible to adjust the rotational speed (vehicle speed) when the claw of the parking pole and the parking gear mesh. For example, by bringing the protruding portion closer to the support shaft, the position of the center of gravity of the parking pole moves toward the support shaft. This makes it possible to increase the speed of the claw side, and therefore the rotational speed at which the claw of the parking pole and the parking gear mesh can be increased.

[0015] (4) In the parking mechanism of the present invention described above, the protruding portion may be formed such that the protruding end side is shaped to fit along the tooth tip forming surface of the parking gear when in contact with the tooth tip.

[0016] The parking mechanism described above has such a configuration that the contact area between the protrusion and the tooth tip of the parking gear can be made large, so that the load is not concentrated at one point. As a result, the parking mechanism described above can improve the durability of the parking pole (including the claw) and the parking gear.

[0017] (5) In the parking mechanism of the present invention described above, the protruding portion may be formed so that, when in contact with the tooth tip, the protruding end side is inclined in a direction along the tangent to the tooth tip forming surface of the parking gear.

[0018] The parking mechanism described above has such a configuration that the contact area between the protrusion and the tooth tip of the parking gear can be made large, so that the load is not concentrated at one point. As a result, the parking mechanism described above can improve the durability of the parking pole (including the claw) and the parking gear.

[0019] (6) In the parking mechanism of the present invention described above, the parking pole may have a rigidity that generates a vibration frequency different from a vibration frequency generated by the parking pole and the parking gear.

[0020] The parking mechanism described above, by adopting such a configuration, can suppress resonance between the parking pole and the parking gear. Therefore, in the parking mechanism described above, it is not necessary to increase the rigidity of the parking pole or the parking gear more than necessary, and therefore a cost reduction effect can be expected. In addition, the generation of abnormal noise due to resonance is suppressed. Here, the vibration frequency generated by the parking pole and the parking gear can be achieved by changing, for example, the shape or size of these. Effect of the Invention

[0021] The present invention can provide a parking mechanism that can prevent deep engagement between the claws of the parking pole and the parking gear, and can improve the durability of the parking pole and the parking gear. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a front view of the parking mechanism according to the embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged explanatory view of a main part of FIG. 1 with a part cut away. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] A parking mechanism 1 according to an embodiment of the present invention will be described below with reference to Fig. 1 and Fig. 2. The parking mechanism 1 is provided, for example, to achieve a parking state in an automatic transmission mounted on a vehicle. In this embodiment, the parking mechanism 1 is provided in a continuously variable transmission 2 (CVT: Continuous Variable Transmission) of the vehicle as an example.

[0024] 1, the parking mechanism 1 is provided, for example, near a rotating shaft 3 of a continuously variable transmission 2. The parking mechanism 1 includes a parking gear 10, a spindle 21 disposed adjacent to the parking gear 10, a parking pole 20 rotatably supported by the spindle 21, and a claw 23 and a protrusion 25 formed on the parking pole 20.

[0025] The continuously variable transmission 2 (also referred to as CVT2) is adapted to change the speed of the output of an engine (power, not shown) mounted on a vehicle and transmit it to a drive shaft (not shown). The CVT2 has a primary pulley (not shown), a secondary pulley 2A, a belt 2B, and the like. The CVT2 transmits the power input from the engine to the secondary pulley 2A via the primary pulley and the belt 2B. The secondary pulley 2A is supported by a rotating shaft 3 and transmits the output from the engine to the rotating shaft 3. Therefore, the rotating shaft 3 rotates indirectly with the output of the engine. Note that output from a source other than the engine (for example, a motor) may be transmitted to the rotating shaft 3. In addition to the indirect transmission of power to the rotating shaft 3, the CVT2 may directly transmit power to the rotating shaft 3.

[0026] A parking gear 10 is supported on the front side (the front side in the figure) of the secondary pulley 2A on the rotating shaft 3. The parking gear 10 rotates integrally with the rotating shaft 3. The parking gear 10 has a plurality of teeth 11 (six in this embodiment) formed on its outer periphery at a predetermined pitch.

[0027] The teeth 11 are formed with a protrusion amount (height) and pitch that allow a predetermined amount of meshing with the claws 23 of the parking pole 20 described later. The teeth 11 have tooth tips 12 formed along the outer circumferential surface of the parking gear 10 at their tip ends. The teeth 11 also have tooth bottoms 13 that are concentric with the tooth tips 12 at their base ends. As shown in Fig. 2, adjacent tooth tips 12, 12 of the teeth 11 are formed with an interval (pitch) of Wb between them.

[0028] 1, a support shaft 21 is disposed adjacent to and below the parking gear 10. The support shaft 21 stands on the outer wall of the CVT 2 so as to be parallel to the rotating shaft 3.

[0029] The parking pole 20 is formed in a rod shape and disposed so as to be located below the parking gear 10. The base end side of the parking pole 20 is supported rotatably about a support shaft 21, and is swingable about the support shaft 21 in a direction approaching or receding from the parking gear 10.

[0030] The parking pole 20 has a claw 23 that can mesh with the parking gear 10 on the tip side of a surface 26 that faces the parking gear 10. The parking pole 20 also has a protrusion 25 at a position offset from the claw 23 in the swing radius direction.

[0031] The parking pole 20 is biased by a spring (not shown) in a direction away from the parking gear 10, and in ranges other than the P range (for example, the D range and the B range), the pawl 23 and the parking gear 10 are separated and do not mesh with each other. On the other hand, when the driver operates the shift lever on the driver's seat to put the parking range (also called the P range), the parking pole 20 is controlled to swing toward the parking gear 10 against the biasing force of the spring.

[0032] The claw 23 is formed on a surface 26 of the parking gear 10 on the tip side of the parking pole 20. The claw 23 is formed to protrude toward the parking gear 10 and is formed to a size that allows it to mesh with the teeth 11 of the parking gear 10. As shown in Fig. 2, the claw 23 protrudes by a protrusion amount Ha from the surface 26 of the parking pole 20 on the side facing the parking gear 10. The claw 23 meshes with the teeth 11 with a predetermined meshing amount, thereby locking the parking gear 10 so that it cannot rotate.

[0033] The protrusion 25 is provided to form a gap 30 between the claw 23 and the tooth bottom 13 when the claw 23 and the parking gear 10 mesh with each other. The protrusion 25 is disposed between the claw 23 and the support shaft 21 on a surface 26 of the parking pole 20 facing the parking gear 10. The protrusion 25 is formed to protrude in the same direction as the claw 23. The protrusion 25 is formed so as to be able to come into contact with the tooth tip 12 of the parking gear 10 when the parking pole 20 is brought close to the parking gear 10.

[0034] Moreover, the protruding portion 25 is formed such that the protruding end side thereof conforms to the tooth tip forming surface of the parking gear 10 when in contact with the tooth tip 12. That is, a wide contact area between the protruding portion 25 and the tooth tip 12 of the parking gear 10 is ensured, so that the load is not concentrated at one point. Moreover, the protruding end side of the protruding portion 25 is formed to be inclined in a direction along the tangential direction of the formation surface of the tooth tip 12 of the parking gear 10 when in contact with the tooth tip 12. This ensures an even wider contact area between the protruding portion 25 and the tooth tip 12 of the parking gear 10, so that the load is further prevented from concentrating at one point.

[0035] As shown in FIG. 2, the protruding portion 25 protrudes from the surface 26 of the parking pole 20 by a protruding amount Hb toward the swing direction of the parking pole 20. Specifically, the protruding amount Hb of the protruding portion 25 is set to be smaller than the protruding amount Ha of the claw 23. Here, the protruding portion 25 is formed to a protruding amount (height) that forms a gap 30 that does not abut the claw 23 and the tooth bottom 13 of the parking gear 10. Therefore, when the parking pole 20 is brought close to the parking gear 10, the protruding portion 25 abuts against the tooth tip 12 of the parking gear 10. Therefore, the protruding portion 25 serves as a stopper, and a gap 30 is formed between the claw 23 and the tooth bottom 13 of the parking gear 10. As a result, when the parking pole 20 swings toward the parking gear 10, contact (also called deep bite) between the claw 23 and the tooth bottom 13 of the parking gear 10 is suppressed. Therefore, in the above-described parking mechanism 1, it is not necessary to increase the rigidity and strength of the parking pole 20 (including the claw 23) and the parking gear 10 more than necessary, and therefore it is possible to suppress an increase in manufacturing costs. Also, the above-described parking mechanism 1 can suppress contact between the claw 23 and the tooth bottom 13, so it is possible to suppress the generation of abnormal noise.

[0036] 2, the distance Wa between the center of the claw 23 and the center of the protrusion 25 is set to be greater than the distance Wb between adjacent tooth tips of the parking gear 10 and smaller than the length Wc of the tooth tip portion (width of the tooth tip 12). In other words, the claw 23 can mesh with the tooth 11 of the parking gear 10, and the protrusion 25 is disposed at a position where it reliably abuts against the tooth tip 12 without meshing with the tooth 11. Thereby, the parking mechanism 1 of the present invention can reliably suppress contact (deep meshing) between the claw 23 and the tooth bottom 13 of the parking gear 10.

[0037] The above is the configuration of the parking mechanism 1 according to one embodiment of the present invention, and next, the operation of the parking mechanism 1 will be described below. Here, the operation will be described taking as an example a case where the shift lever is operated to the P range when the vehicle is not completely stopped.

[0038] 1, when the driver operates the shift lever to the P range, the parking pole 20 swings against a spring (not shown) via an appropriate mechanism (not shown) and approaches the parking gear 10. As the parking pole 20 swings, the claw 23 assumes a position for meshing with the parking gear 10, while the claw 23 is repelled by the teeth 11 of the rotating parking gear 10. Therefore, the parking pole 20 is repelled by the number of teeth 11 and repeats small swings.

[0039] When the vehicle reaches a predetermined speed (e.g., 3 km / h), the claw 23 of the parking pole 20 starts to mesh with the tooth 11 of the parking gear 10. When the meshing between the claw 23 and the tooth 11 progresses and the gap 30 between the claw 23 and the tooth bottom 13 reaches a predetermined distance, the protruding portion 25 comes into contact with the tooth tip 12. This completes the meshing between the claw 23 and the tooth 11, and the parking gear 10 is locked so as not to rotate. In other words, when the parking pole 20 is brought close to the parking gear 10, the protruding portion 25 comes into contact with the tooth tip 12 of the parking gear 10 and the gap 30 is formed between the claw 23 and the tooth bottom 13 of the parking gear 10, and the parking gear 10 is locked so as not to rotate. In short, the protruding portion 25 plays a role like a stopper, thereby suppressing contact (deep meshing) between the claw 23 and the tooth bottom 13.

[0040] In this manner, in the parking mechanism 1 of the present invention, the parking pole 20 is provided with the protruding portion 25 that directly contacts the tooth tip 12 of the parking gear 10. Therefore, the parking mechanism 1 of the present invention can accurately adjust the meshing amount (depth) between the claw 23 and the parking gear 10. That is, for example, compared to a case where the protruding portion 25 is disposed on the cover side of the CVT 2, the number of parts can be reduced, so that the accumulation of accuracy errors of the parts can be suppressed and the accuracy of the meshing amount can be improved. Furthermore, according to the parking mechanism 1 of the present invention, the number of parts can be reduced, so that costs can be reduced.

[0041] In addition, the parking pole 20 constituting the present invention can easily adjust its rigidity by changing the shape and size of the protruding portion 25. In addition, the protruding portion 25 can be disposed at any position as long as it can come into contact with the tooth tip 12 of the parking gear 10 when the parking pole 20 swings toward the parking gear 10.

[0042] Moreover, the parking mechanism 1 of the present invention can be made smaller by changing the position of the protruding portion 25 between the claw 23 and the support shaft 21. Moreover, by adopting such a configuration, the parking mechanism 1 of the present invention can easily change the center of gravity of the parking pole 20. This makes it possible to adjust the rotational speed (vehicle speed) when the claw 23 of the parking pole 20 and the parking gear 10 mesh. For example, by moving the protruding portion 25 closer to the support shaft 21, the position of the center of gravity of the parking pole 20 moves toward the support shaft 21. This makes it possible to increase the speed (circumferential speed) on the claw 23 side, and to increase the rotational speed at which the claw 23 of the parking pole 20 and the parking gear 10 mesh.

[0043] In addition, in the parking mechanism 1 of the present invention, the parking pole 20 may have a rigidity that generates a vibration frequency different from the vibration frequency generated by the parking pole 20 and the parking gear 10. With such a configuration, it is possible to suppress resonance between the parking pole 20 and the parking gear 10 that occurs when the claw 23 of the parking pole 20 meshes with the parking gear 10 (including the case where the claw 23 is repelled by the teeth 11). Therefore, it is not necessary to increase the rigidity of the parking pole 20 and the parking gear 10 more than necessary, and therefore a cost reduction effect can be expected. In addition, the generation of abnormal noise due to resonance is suppressed. Here, the vibration frequency generated by the parking pole 20 and the parking gear 10 can be achieved by changing the shape or size of these, for example.

[0044] The above is one embodiment of the parking mechanism 1 according to the present invention, but the parking mechanism 1 of the present invention is not limited to the above-described embodiment and can be modified in various ways.

[0045] In the present embodiment, the parking mechanism 1 mounted on the CVT 2 has been described as an example, but the present invention is not limited thereto and can also be used in a stepped automatic transmission (AT). The parking mechanism 1 of the present invention can be widely used not only in a continuously variable transmission but also as a mechanism for keeping various power mechanisms stopped. The parking gear 10 used in the parking mechanism 1 of the present invention can be of various sizes and shapes (including the number of teeth). In the present embodiment, the parking pole 20 is located below the parking gear 10, but the present invention is not limited thereto. The parking pole 20 can be disposed in various positions, for example, the parking pole 20 may be disposed above or to the side of the parking gear 10. The parking pole 20 can be of various shapes and sizes. The shapes and sizes of the claws 23 and the protruding parts 25, or the positions at which they are disposed, can be appropriately changed according to the shapes and sizes of the parking pole 20 and the parking gear 10. The mechanism for swinging the parking pole 20 can be of various sizes.

[0046] In this embodiment, the protrusion 25 is set to have a smaller protrusion amount in the swing direction of the parking pole 20 than the claw 23, and the distance Wa between the center of the claw 23 and the center of the protrusion 25 is set to be larger than the distance Wb between the adjacent tooth tips 12 of the parking gear 10 and smaller than the length Wc of the tooth tip portion (distance Wc), but is not limited thereto. The protrusion amount of the protrusion 25 and the distances Wa, Wb, and Wc can be set in various ways depending on the shapes and sizes of the parking pole 20 and the parking gear 10. In other words, the distances Wa, Wb, and Wc can be set in various ways as long as the claw 23 can mesh with the teeth 11 of the parking gear 10 and the protrusion 25 can reliably abut against the tooth tips 12 without meshing with the teeth 11.

[0047] In this embodiment, the protruding portion 25 is disposed between the claw 23 and the support shaft 21, but the present invention is not limited to this, and the protruding portion 25 can be disposed in various positions. For example, the protruding portion 25 may be disposed on the tip side of the claw 23. In such a case, the protruding amount of the parking pole 20 in the swing direction may be set to be larger than that of the claw 23.

[0048] In this embodiment, the protruding portion 25 is formed in a shape such that the protruding end side conforms to the tooth tip forming surface of the parking gear 10 when in contact with the tooth tip 12, but is not limited to this. The shape of the protruding end side of the protruding portion 25 can be formed in various shapes and sizes that can contact the tooth tip 12. In such cases, it is preferable to form the contact portion between the protruding portion 25 and the tooth tip 12 into a shape and size that allows them to contact as a surface.

[0049] In this embodiment, when the protrusion 25 and the tooth tip 12 are in contact with each other, the protrusion end of the protrusion 25 is inclined in a direction along the tangent of the tooth tip forming surface of the parking gear 10, but is not limited to this. The inclination direction of the protrusion end of the protrusion 25 can be formed in various directions depending on the shape of the tooth tip 12 of the parking gear 10, the shape of the parking pole 20, the position where it is arranged, etc. In such a case, it is preferable that the contact portion between the protrusion 25 and the tooth tip 12 is inclined (including horizontally) so as to contact as a surface.

[0050] In this embodiment, the vibration frequency generated by the parking pole 20 and the parking gear 10 is changed by changing the shape, size, material, etc., but is not limited to these. For example, the vibration frequency of each of the parking pole 20 and the parking gear 10 may be changed by attaching an appropriate weight, etc. to the parking pole 20 and the parking gear 10.

[0051] The above are various embodiments and modifications of the parking mechanism 1 according to the present invention. However, the present invention is not limited to those exemplified in the above-mentioned embodiments and modifications, and it will be easily understood by those skilled in the art that other embodiments are possible in accordance with the teachings and spirit of the present invention without departing from the scope of the claims. [Industrial Applicability]

[0052] The parking mechanism of the present invention can be used as a locking mechanism for a transmission in various vehicles, and also as a locking mechanism for various power shafts. [Explanation of symbols]

[0053] 1: Parking mechanism 2: Continuously variable transmission (CVT) 3: Rotation axis 10: Parking gear 11: Teeth 12: Tooth tip 13:Tooth bottom 20: Parking pole 21: Support shaft 23: Nails 25: Protrusion (stopper) 30 :Void

Claims

[Claim 1] A parking mechanism for parking a vehicle, comprising: a parking gear rotatably supported on a rotating shaft that rotates directly or indirectly in response to an output of power; A support shaft disposed adjacent to the parking gear; a parking pole supported so as to be swingable about the support shaft in a direction approaching and receding from the parking gear, the parking pole having a claw capable of engaging with the parking gear as the parking pole swings; The parking pawl has a protruding portion formed adjacent to the claw at a position offset in a swing radial direction from the claw and protruding in the same direction as the claw, The parking pole has an opposite side to the claw formed thereon, and the opposite side is formed to protrude in a direction opposite to the protruding direction of the claw, The protruding portion is disposed between the claw and the support shaft, and is set to have a smaller protruding amount in a swing direction of the parking pole than the claw, a distance between a center of the claw and a center of the protrusion is set to be larger than a distance between adjacent tooth tips of the parking gear and smaller than a length of the tooth tip portions, when the parking pole is brought close to the parking gear and the claw is engaged with the parking gear, the protrusion comes into contact with the tip of the tooth of the parking gear, and a gap is formed between the claw and the bottom of the tooth of the parking gear, thereby locking the parking gear so that it cannot rotate, The parking mechanism comprises a parking gear having a parking surface and a parking gear unit.

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