Transmission device

Abstract

Provided is a transmission device capable of removing air from a support of a pole shaft while maintaining the strength of the support. A transmission device according to an aspect of the present disclosure comprises: a transmission mechanism; a parking lock mechanism; and a gear case. The parking lock mechanism has a pole shaft and a parking pole oscillatable about the pole shaft. The gear case has a first support that supports a first end of the pole shaft, and a second support that supports a second end of the pole shaft and that has, as compared to the first support, greater rigidity with respect to a lock load applied from the parking pole. The pole shaft has a communication hole formed from the first end to the second end. The second support has an insertion port, a bottom surface, and a groove extending from the bottom surface to the insertion port.

Description

[Technical Field]

[0001] The present disclosure relates to a transmission. [Background technology]

[0002] In a parking lock mechanism provided in a transmission, the pole shaft, which serves as the rotation axis of the parking pawl, is supported by a support provided in the gear case. A radial load is generated on this pole shaft when the parking pawl locks the input shaft (see Patent Document 1).

[0003] Therefore, if the gap between the pole shaft and the support is large, the parking pole may become misaligned due to the load, which may result in insufficient parking lock. Therefore, it is necessary to minimize the gap between the pole shaft and the support. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-072203 Summary of the Invention [Problem to be solved by the invention]

[0005] To minimize the gap between the pole shaft and the support, it is necessary to remove air from the support when inserting the pole shaft into the support during assembly of the transmission. To address this, providing a groove in the support can remove air from the support, but the groove reduces the strength of the support.

[0006] One aspect of the present disclosure preferably provides a transmission device that can bleed air from the support portion of the pole shaft while maintaining the strength of the support portion. [Means for solving the problem]

[0007] One aspect of the present disclosure is a transmission device including a transmission mechanism having an input shaft, a parking lock mechanism, and a gear case that houses the transmission mechanism and the parking lock mechanism. The parking lock mechanism includes a pole shaft having an axis parallel to the rotation axis of the input shaft, and a parking pawl that is rotatable about the pole shaft between a locked position where the parking pawl engages with the input shaft to restrict rotation of the input shaft and an unlocked position where the parking pawl is disengaged from the input shaft.

[0008] The gear case has a first support part that supports a first end of the pole shaft, and a second support part that supports a second end of the pole shaft opposite the first end and has greater rigidity than the first support part against a locking load received from the parking pawl when the parking pawl is in the locked position. The pole shaft has a communication hole that reaches from the end face of the first end to the end face of the second end. The first support part contacts the first end over the entire circumferential direction. The second support part has an insertion opening through which the second end is inserted, a bottom surface that faces the end face of the second end in the axial direction of the pole shaft, and a groove that extends from the bottom surface to the insertion opening.

[0009] With this configuration, the air in the first support part is sent into the second support part through the communication hole in the pole shaft. Furthermore, the air in the second support part is discharged to the outside of the second support part through the groove in the second support part. This allows air to be removed from the first support part and the second support part when the pole shaft is inserted into the first support part and the second support part.

[0010] Furthermore, by providing a groove only in the second support part, which has high rigidity against the locking load received from the pole shaft, of the first support part and the second support part, the strength of each of the first support part and the second support part can be maintained.

[0011] In one embodiment of the present disclosure, when viewed from the axial direction of the pole shaft, a line connecting the axis of the pole shaft and the center of the groove may intersect with the direction of the lock load. With this configuration, it is possible to suppress a decrease in strength of the second support part due to the groove.

[0012] In one aspect of the present disclosure, the parking lock mechanism may include a torsion spring wound around the pole shaft and biasing the parking pole toward the unlocked position. The torsion spring may be located on the opposite side of the parking pole from the first support portion. The first support portion may include a boss protruding from the inner surface of the gear case and a collar inserted into the boss.

[0013] With this configuration, the torsion spring increases the strength of the first support part, which is closer to the parking pole than the second support part, and therefore increases the strength of the first support part, which receives a larger load from the parking pole. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic right side view of a transmission device according to an embodiment with a second case removed. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a schematic left side view of the transmission device of FIG. 1 with the first case removed. [Figure 4] FIG. 4 is an enlarged view of the parking lock mechanism and its surroundings in FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is an enlarged view of the vicinity of the pole shaft in FIG. [Figure 7] FIG. 7 is a schematic left side view of the second case of FIG. [Figure 8] FIG. 8 is a schematic right side view of the first case of FIG. [Explanation of symbols]

[0015] 1...transmission device, 2...transmission mechanism, 3...gear case, 3A...first case, 3B...second case, 3C...fastener, 3D...fastening hole, 3E... support portion adjacent region, 5... parking lock mechanism, 21... input gear, 31...breather chamber, 31A...first chamber, 31B...second chamber, 31C...spare chamber, 31D...connecting portion, 34...first support portion, 35...second support portion, 37...reinforcing portion, 51...pole shaft, 52...parking pole, 53...torsion spring, 212...input shaft, 341...boss, 342...collar, 343...first bottom surface, 351...insertion port, 352...Second bottom surface, 353...Groove, 511...First end, 511A...End surface, 512...Second end portion, 512A...End surface, 513...Communication hole, 521...Engaging portion. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First embodiment] [1-1.Configuration] The transmission device 1 shown in FIG. 1 is installed in an automobile and transmits power from a drive source of the automobile to the wheels.

[0017] The transmission device 1 includes a transmission mechanism 2, a gear case 3, and a parking lock mechanism 5. The transmission device 1 is installed in the automobile in an orientation in which the direction parallel to the rotation axis L1 of the input gear 21 of the transmission mechanism 2 is the left-right direction, and the direction in which the input gear 21 is arranged relative to the ring gear 23 is the forward direction.

[0018] <Transmission mechanism> As shown in FIG. 2, the power transmission mechanism 2 has an input gear 21, a counter gear 22, a ring gear 23, a differential case 24, and a differential mechanism 25.

[0019] <Input gear> The input gear 21 is an external gear that is drivingly connected to a motor (not shown) and rotates around its axis by the driving force of the motor.

[0020] A rotation axis L1 of the input gear 21 is parallel to the left-right direction. The input gear 21 has a gear portion 211 and an input shaft 212 concentrically connected to the gear portion 211. The input shaft 212 is a shaft portion to which the driving force of the motor is input. The input shaft 212 has a parking gear 212A.

[0021] <Counter gear> The counter gear 22 has a rotation axis L2 that is parallel to the rotation axis L1 of the input gear 21.

[0022] The rotation axis L2 of the counter gear 22 is located rearward of the rotation axis L1 of the input gear 21, and is located above the rotation axis L1 of the input gear 21 and the rotation axis L3 of the ring gear 23 (see FIG. 1). The counter gear 22 has a first gear 221 and a second gear 222.

[0023] The first gear 221 is an external gear that meshes with the input gear 21. The second gear 222 is an external gear that meshes with the ring gear 23. The second gear 222 has a smaller outer diameter than the first gear 221 and is disposed concentrically with the first gear 221. The second gear 222 is disposed to the right of the first gear 221.

[0024] <Ring gear> The ring gear 23 is an external gear having a rotation axis L3 parallel to the rotation axis L1 of the input gear 21. The rotation axis L3 of the ring gear 23 is located rearward of the rotation axis L2 of the counter gear 22. The ring gear 23 rotates the differential case 24 by the rotational force transmitted from the counter gear 22.

[0025] <Differential case> The differential case 24 is fixed to the ring gear 23 and rotates together with the ring gear 23 about a rotation axis L3 of the ring gear 23. The differential case 24 has a differential mechanism accommodating portion 241, a first shaft portion 243, and a second shaft portion 244.

[0026] The differential mechanism accommodating portion 241 accommodates the differential mechanism 25. The first shaft portion 243 is a cylindrical portion through which a first output shaft (not shown) connected to the differential mechanism 25 is inserted. The second shaft portion 244 is a cylindrical portion through which a second output shaft (not shown) connected to the differential mechanism 25 is inserted.

[0027] <Differential mechanism> The differential mechanism 25 is a known mechanism that distributes and transmits the rotation of the differential case 24 to the first output shaft and the second output shaft while causing the first output shaft and the second output shaft to rotate differentially. The differential mechanism 25 is disposed inside the differential mechanism accommodating portion 241.

[0028] The differential mechanism 25 has two side gears respectively connected to the first output shaft and the second output shaft, and two pinion gears that transmit the rotation of the differential case 24 to the two side gears.

[0029] The rotational axes of the first output shaft and the second output shaft coincide with the rotational axis of the ring gear 23. The first output shaft and the second output shaft rotate differentially and in accordance with the rotational direction of the input gear 21 (i.e., the rotational direction of the differential case 24).

[0030] <Parking lock mechanism> As shown in FIG. 3, the parking lock mechanism 5 includes a pole shaft 51, a parking pole 52, and a torsion spring 53.

[0031] <Pole shaft> The pole shaft 51 is a shaft portion having an axis L4 parallel to the rotation axis L1 of the input shaft 212. The pole shaft 51 is supported by the gear case 3. The pole shaft 51 is disposed below the breather chamber 31, between the input shaft 212 and an inner surface of the gear case 3 (specifically, the inner surface of the front wall 3G) that intersects with the front-rear direction, in a direction perpendicular to both the axial direction and the up-down direction of the input shaft 212 (i.e., the front-rear direction).

[0032] <Parking pole> The parking pole 52 can swing around the pole shaft 51 between a locked position shown by a dashed line in Fig. 4 and an unlocked position shown by a solid line in Fig. 4. In the locked position, the parking pole 52 engages with the parking gear 212A of the input shaft 212 to restrict the rotation of the input shaft 212. In the unlocked position, the parking pole 52 disengages from the input shaft 212.

[0033] Specifically, the parking pole 52 has an engaging portion 521 that engages with the parking gear 212A provided on the outer circumferential surface of the input shaft 212 from the radially outer side of the input shaft 212 (specifically, from below).

[0034] <Torsion spring> The torsion spring 53 is wound around the pole shaft 51 and biases the parking pole 52 toward the unlocked position. One end of the torsion spring 53 is fixed to the first case 3A. The other end of the torsion spring 53 is fixed to the parking pole 52.

[0035] 5, the torsion spring 53 is disposed on the opposite side of the parking pole 52 from the first support portion 34 of the gear case 3. In other words, the torsion spring 53 is wound around the pole shaft 51 in an area to the right of the parking pole 52.

[0036] The parking pole 52 moves to the locked position in response to an input from an actuator (not shown) in the locking direction, and returns to the unlocked position in response to an input from the actuator in the unlocking direction and the biasing force of the torsion spring 53.

[0037] <Gear case> 2, the gear case 3 houses the power transmission mechanism 2 and the parking lock mechanism 5. The gear case 3 has a first case 3A and a second case 3B that sandwich the power transmission mechanism 2 and the parking lock mechanism 5 in the axial direction of the input gear 21 (i.e., the left-right direction).

[0038] The first case 3A and the second case 3B are fixed to each other in the left-right direction by a plurality of fasteners 3C (for example, bolts), thereby defining an internal space that houses the transmission mechanism 2 and the parking lock mechanism 5. Note that in FIG. 2, the portion of the first case 3A that houses a motor (not shown), which is a drive source, is not shown.

[0039] <Breather chamber> As shown in FIG. 1, the gear case 3 has a breather chamber 31 and a breather pipe 32.

[0040] The breather chamber 31 is a space that communicates the internal space that houses the power transmission mechanism 2 and the parking lock mechanism 5 with the outside of the gear case 3. The breather chamber 31 separates oil mist from breathing air that contains oil mist in the internal space of the gear case 3. The air from which the oil mist has been separated is discharged to the outside of the gear case 3 through a breather pipe 32.

[0041] As shown in FIG. 3, the breather chamber 31 has a first chamber 31A, a second chamber 31B, a spare chamber 31C, a communication portion 31D, a first communication port 31E (see FIG. 1), and a second communication port 31F (see FIG. 1).

[0042] 3, the first chamber 31A communicates with the internal space of the gear case 3 via the communication portion 31D. The first chamber 31A also communicates with the spare chamber 31C and the second chamber 31B. The communication portion 31D communicates between the inside of the breather chamber 31 and the outside of the breather chamber 31 in the internal space of the gear case 3.

[0043] The second chamber 31B is disposed above the first chamber 31A. The second chamber 31B is a chamber into which breathing air flows from the first chamber 31A. As shown in FIG. 1, the second chamber 31B communicates with the first chamber 31A via a first communication port 31E. The second chamber 31B also communicates with the breather pipe 32 via a second communication port 31F.

[0044] The auxiliary chamber 31C is disposed in front of the first chamber 31A and the second chamber 31B. The auxiliary chamber 31C is a chamber into which a portion of the breathing air that has passed through the communication portion 31D flows. The auxiliary chamber 31C does not directly communicate with the second chamber 31B.

[0045] The first chamber 31A, the second chamber 31B, and the spare chamber 31C are arranged across the first case 3A and the second case 3B. Specifically, these chambers are formed by ribs protruding from the inner surface of the first case 3A that intersects with the left-right direction, and ribs protruding from the inner surface of the second case 3B that intersects with the left-right direction. The connecting portion 31D is also provided across the first case 3A and the second case 3B.

[0046] The first communication port 31E and the second communication port 31F are provided only in the first case 3A, and not in the second case 3B. That is, the first communication port 31E and the second communication port 31F are disposed on the right side of the gear case 3. On the other hand, the communication port 31G between the first chamber 31A and the spare chamber 31C is disposed on the left side of the gear case 3 (see FIG. 3).

[0047] The breathing air in the gear case 3 passes through the communication portion 31D and flows into the spare chamber 31C and the first chamber 31A. The breathing air that flows into the first chamber 31A flows to the right, passes through the first communication port 31E, and flows into the second chamber 31B. The breathing air that flows into the second chamber 31B passes through the second communication port 31F and is discharged from the breather pipe 32 to the outside of the gear case 3. Oil mist contained in the breathing air is separated from the air as it flows through the breather chamber 31.

[0048] <First support part, second support part, and reinforcing part> As shown in FIG. 5, the gear case 3 has a first support portion 34, a second support portion 35, and a reinforcing portion 37.

[0049] 6, the first support portion 34 supports the first end portion 511 (i.e., the left end portion) of the pole shaft 51. The first support portion 34 has a boss 341, a collar 342, and a first bottom surface 343.

[0050] The boss 341 is a portion that protrudes rightward from the inner surface of the second case 3B that intersects with the left-right direction. The collar 342 is a cylindrical member that is press-fitted into the boss 341. The collar 342 contacts the first end 511 of the pole shaft 51 over the entire circumferential direction.

[0051] The protruding end face (i.e., the right end face) of the boss 341 is in contact with or close to the parking pole 52. The parking pole 52 is in contact with a step 514 of the pole shaft 51. The step 514 is a portion of the pole shaft 51 where the right region is larger in diameter than the left region. Note that instead of the protruding end face of the boss 341, the right end face of the collar 342 may be in contact with or close to the parking pole 52.

[0052] The parking pole 52 is positioned by being sandwiched between the first support portion 34 and the step 514 in the axial direction of the pole shaft 51. The outer diameter of the first end 511 of the pole shaft 51 is smaller than the outer diameter of the second end 512 (i.e., the right end) on the opposite side.

[0053] The first bottom surface 343 faces the end surface 511A of the first end portion 511 in the axial direction of the pole shaft 51. The first bottom surface 343 is disposed apart from the end surface 511A of the first end portion 511. In other words, a first buffer space S1 in which air is present is formed between the first bottom surface 343 and the first end portion 511.

[0054] The first buffer space S1 communicates with a communication hole 513 that reaches from an end face 511A of the first end 511 to an end face 512A of the second end 512 of the pole shaft 51. Other than the communication hole 513, no flow path that communicates with the outside of the first support part 34 is connected to the first buffer space S1.

[0055] That is, there is no gap or groove between the first end 511 and the collar 342, and between the collar 342 and the boss 341. The air in the first buffer space S1 can flow to the outside of the first support part 34 only through the communication hole 513.

[0056] 7, the first support portion 34 (more specifically, the boss 341) constitutes a part of the wall of the breather chamber 31. Specifically, the first support portion 34 constitutes the lower wall of the auxiliary chamber 31C and also constitutes a part of the communication portion 31D (i.e., the side wall of the communication portion 31D).

[0057] In this way, the first support portion 34 constitutes a part of the wall of the breather chamber 31, and the pole shaft 51 supported by the first support portion 34 prevents oil from entering the breather chamber 31. Therefore, the release of oil from the breather pipe 32 is prevented.

[0058] 6, the second support part 35 supports the second end 512 of the pole shaft 51. The second support part 35 is configured as a recess provided by drilling a hole in the inner surface of the first case 3A that intersects with the left-right direction. In other words, the second support part 35 does not have a boss.

[0059] Therefore, when the parking pole 52 is in the locked position, the first rigidity against the first locking load F1 and the second rigidity against the second locking load F2 that the second support part 35 receives from the parking pole 52 are greater than the first rigidity against the first locking load F1 and the second rigidity against the second locking load F2 that the first support part 34 receives from the parking pole 52, respectively.

[0060] 7 and 8, the first locking load F1 is a load generated in the first support portion 34 and the second support portion 35 when the input shaft 212 rotates in a first direction D1, and is a downward, rearward load. The first direction D1 is the direction in which the input shaft 212 rotates when the vehicle is moving forward.

[0061] The second locking load F2 is a load that occurs in the first support portion 34 and the second support portion 35 when the input shaft 212 rotates in a second direction D2 that is opposite to the first direction D1, and is a load in the opposite direction to the first locking load F1. The second direction D2 is the direction in which the input shaft 212 rotates when the vehicle is moving backward.

[0062] When both the first support portion 34 and the second support portion 35 have bosses that protrude from the inner surface of the gear case 3, the larger the outer diameter of the boss, the higher the first rigidity and second rigidity.

[0063] 6, the second support part 35 has an insertion opening 351, a second bottom surface 352, and a groove 353. The insertion opening 351 is an opening into which the second end part 512 is inserted, and is provided on the inner surface of the first case 3A that intersects with the left-right direction. The second bottom surface 352 faces the end surface 512A of the second end part 512 in the axial direction of the pole shaft 51.

[0064] The second bottom surface 352 is disposed away from the end surface 512A of the second end portion 512. In other words, a second buffer space S2 in which air is present is formed between the second bottom surface 352 and the second end portion 512. The second buffer space S2 is in communication with the communication hole 513 of the pole shaft 51.

[0065] The groove 353 is a slit extending from the second bottom surface 352 to the insertion opening 351. The groove 353 communicates between the second buffer space S2 and the outside of the second support portion 35. The groove 353 is provided in a part of the circumferential direction in the side wall that covers the second end portion 512 from the radially outer side.

[0066] The air in the second buffer space S2 is discharged to the outside of the second support part 35 through the groove 353. Furthermore, the air in the first buffer space S1 is also discharged to the outside of the second support part 35 through the communication hole 513, the second buffer space S2, and the groove 353.

[0067] As shown in FIG. 8, when viewed in the axial direction of the pole shaft 51, an imaginary line V2 connecting the axis L4 of the pole shaft 51 and the center of the groove 353 intersects with the directions of the first locking load F1 and the second locking load F2.

[0068] Furthermore, the first support portion 34 and the second support portion 35 are each disposed closer to the inner surface of the gear case 3 intersecting the front-rear direction (that is, the inner surface of the front wall 3G) than the input shaft 212 in the front-rear direction.

[0069] As shown in FIG. 7, the reinforcing portion 37 connects the support portion adjacent region 3E and the first support portion 34 in a direction perpendicular to the axial direction of the input shaft 212 (that is, in the radial direction of the pole shaft 51).

[0070] The support portion adjacent region 3E is a region (i.e., a part of the front wall 3G) on the opposite side of the engaging portion 521 across the pole shaft 51 in the outer frame of the gear case 3. In other words, the support portion adjacent region 3E is a region in the outer frame of the gear case 3 where the distance from the first supporting portion 34 to the engaging portion 521 is smaller than the distance from the first supporting portion 34 to the engaging portion 521.

[0071] 4, the reinforcing portion 37 protrudes from the inner surface of the second case 3B that intersects with the left-right direction, and is integrated with the boss 341 of the first support portion 34 and the support portion adjacent region 3E. The width of the reinforcing portion 37 in the up-down direction increases toward the front.

[0072] 4, the second case 3B has a plurality of fastening holes 3D in its outer frame portion through which fasteners 3C are inserted in the left-right direction. The plurality of fastening holes 3D are provided at positions that overlap with the plurality of fastening holes 3F (see FIG. 1) provided in the first case 3A.

[0073] Furthermore, when viewed from the axial direction of the input shaft 212, the fastener 3C is present in a specific region A of the support portion proximity region 3E where the distance D from the imaginary straight line V1 extending the center line of the parking pole 52 in the locked position is less than half the standard width of the parking pole 52.

[0074] The "reference width of the parking pole 52" is the width of the parking pole 52 at a portion including the axis L4 of the pole shaft 51 (that is, the length in the direction perpendicular to the center line).

[0075] [1-2.Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) The communication hole 513 of the pole shaft 51 sends the air inside the first support part 34 into the second support part 35. Furthermore, the groove 353 of the second support part 35 expels the air inside the second support part 35 to the outside of the second support part 35. This allows air to be released from the first support part 34 and the second support part 35 when the pole shaft 51 is inserted into the first support part 34 and the second support part 35.

[0076] (1b) Of the first support portion 34 and the second support portion 35, the groove 353 is provided only in the second support portion 35, which has high rigidity against the locking load received from the pole shaft 51, thereby making it possible to maintain the strength of each of the first support portion 34 and the second support portion 35.

[0077] (1c) The imaginary line V2 connecting the axis L4 of the pole shaft 51 and the center of the groove 353 intersects with the direction of the locking loads F1 and F2, so that a reduction in strength of the second support portion 35 due to the groove 353 can be suppressed.

[0078] (1d) The first support portion 34 has the collar 342 inserted into the boss 341, and therefore the torsion spring 53 can increase the strength of the first support portion 34, which is closer to the parking pole 52 than the second support portion 35. In other words, the strength of the first support portion 34, which receives a larger load from the parking pole 52, can be increased.

[0079] 2. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0080] (2a) In the transmission device of the above embodiment, a straight line connecting the axis of the pole shaft and the center of the groove when viewed in the axial direction of the pole shaft may be parallel to the direction of the lock load.

[0081] (2b) In the transmission device of the above embodiment, the torsion spring may be disposed on the left side of the parking pole. Also, the first support portion does not necessarily have to have a boss and a collar.

[0082] (2c) In the transmission device of the above embodiment, the gear case does not necessarily have to have a first case and a second case. In other words, the gear case does not necessarily have to be composed of parts separated in the axial direction of the input shaft.

[0083] (2d) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. All aspects included in the technical idea identified by the wording of the claims are embodiments of the present disclosure.

Claims

1. a transmission mechanism having an input shaft; A parking lock mechanism; a gear case that accommodates the transmission mechanism and the parking lock mechanism; Equipped with The parking lock mechanism is a pole shaft having an axis parallel to the rotation axis of the input shaft; a parking pawl that can swing about the pawl shaft between a locked position where the parking pawl engages with the input shaft to restrict rotation of the input shaft and an unlocked position where the parking pawl is disengaged from the input shaft; and The gear case includes: a first support portion that supports a first end portion of the pole shaft; a second support portion that supports a second end portion of the pole shaft opposite to the first end portion, and that has greater rigidity than the first support portion against a locking load received from the parking pole when the parking pole is in the locked position; and the pole shaft has a communication hole that reaches from an end surface of the first end to an end surface of the second end, the first support portion is in contact with the first end portion over the entire circumferential direction, The second support portion is an insertion port into which the second end is inserted; a bottom surface facing the end surface of the second end portion in the axial direction of the pole shaft; a groove extending from the bottom surface to the insertion opening; A transmission device having:

2. 2. The transmission device according to claim 1, a straight line connecting the axis of the pole shaft and the center of the groove intersects with the direction of the lock load when viewed from the axial direction of the pole shaft.

3. The transmission device according to claim 1 or 2, the parking lock mechanism includes a torsion spring wound around the pole shaft and biasing the parking pole toward the unlocked position; the torsion spring is disposed on the opposite side of the parking pole from the first support portion, The first support portion is A boss protruding from the inner surface of the gear case; a collar inserted inside the boss; A transmission device having:

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