Transmission device

Abstract

Provided is a transmission device capable of extracting air from a support part while maintaining the strength of the support part of a pawl shaft. According to one aspect of the present disclosure, a transmission device is provided with a transmission mechanism, a parking lock mechanism, and a gearbox. The parking lock mechanism has a pawl shaft and a parking pawl capable of swinging about the pawl shaft. The gear box includes a first support portion that supports a first end portion of the pawl shaft, and a second support portion that supports a second end portion of the pawl shaft, and the second support portion has a greater rigidity with respect to a lock load received from the parking pawl than the first support portion. The pawl shaft has a communication hole extending from a first end portion to a second end portion. The second support portion has an insertion opening, a bottom surface, and a groove extending from the bottom surface to the insertion opening.

Description

Technical Field

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

[0002] In the parking lock mechanism provided in the transmission, a pawl shaft as a rotation shaft of the parking pawl is supported by a support portion provided in the gear box. When the parking pawl locks the input shaft, a radial load is generated on the pawl shaft (see Patent Document 1).

[0003] Therefore, if the clearance between the pawl shaft and the support portion is large, the parking pawl may be misaligned due to the load, which may result in insufficient parking locking. Therefore, it is necessary to minimize the clearance between the pawl shaft and the support portion.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2017-072203 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] In order to minimize the gap between the pawl shaft and the support part, it is necessary to extract air from the support part when the pawl shaft is inserted into the support part in assembling the transmission device. In this regard, by providing a groove on the support part, air can be extracted from the support part, but the groove will reduce the strength of the support part.

[0009] One aspect of the present disclosure preferably provides a transmission device capable of maintaining the strength of a support portion of a pawl shaft while extracting air from the support portion.

[0010] Solutions to the problem

[0011] One aspect of the present disclosure is a transmission device, which includes: a transmission mechanism having an input shaft; a parking lock mechanism; and a gear box, which accommodates the transmission mechanism and the parking lock mechanism. The parking lock mechanism includes: a pawl shaft having an axis parallel to the rotation axis of the input shaft; and a parking pawl, which can swing between a locking position and a lock release position with the pawl shaft as the center, wherein the locking position is a position where the rotation of the input shaft is restricted by the engagement of the parking pawl with the input shaft, and the lock release position is a position where the parking pawl is separated from the input shaft.

[0012] The gear case has: a first support portion that supports a first end portion of a pawl shaft; and a second support portion that supports a second end portion of the pawl shaft that is located on the opposite side of the first end portion, and when the parking pawl is in a locked position, the second support portion has a greater rigidity to a locking load borne from the parking pawl than the first support portion to a locking load borne from the parking pawl. The pawl shaft has a connecting hole that reaches from an end face of the first end portion to an end face of the second end portion. The first support portion is in contact with the first end portion in the entire circumferential direction. The second support portion has: an insertion port for inserting the second end portion; a bottom surface that is opposite to the end face of the second end portion in the axial direction of the pawl shaft; and a groove that extends from the bottom surface to the insertion port.

[0013] According to the above configuration, the air in the first support part is delivered to the second support part through the communicating hole of the ratchet shaft. Furthermore, the air in the second support part is discharged to the outside of the second support part through the groove of the second support part. Thus, when the ratchet shaft is inserted into the first support part and the second support part, the air can be extracted from the first support part and the second support part.

[0014] Furthermore, by providing the groove only in the second support portion having a higher rigidity with respect to the lock load received from the parking pawl, the strength of each of the first support portion and the second support portion can be maintained.

[0015] In one aspect of the present disclosure, a straight line connecting the axial core of the pawl shaft and the center of the groove may intersect the direction of the lock load when viewed from the axial direction of the pawl shaft. According to the above configuration, it is possible to suppress a reduction in strength of the second support portion caused by the groove.

[0016] In one embodiment of the present disclosure, the parking lock mechanism may include a torsion spring that is wound around the pawl shaft and urges the parking pawl toward the lock release position. The torsion spring may be arranged on the side opposite to the first support portion across the parking pawl. The first support portion may include: a boss that protrudes from the inner surface of the gear case; and a bushing that is inserted into the inside of the boss.

[0017] According to the above configuration, the presence of the torsion spring can enhance the strength of the first support portion which is closer to the parking pawl than the second support portion. That is, the strength of the first support portion which receives a greater load from the parking pawl can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic right side view of the transmission device in the embodiment, wherein the transmission device is in a state where the second case is removed.

[0019] Figure 2 It is along Figure 1 Schematic cross-sectional view along line II-II in FIG.

[0020] Figure 3 yes Figure 1 A schematic left side view of a transmission device, wherein the transmission device is in a state with the first housing removed.

[0021] Figure 4 yes Figure 3 Magnified view of the area surrounding the parking lock mechanism.

[0022] Figure 5 It is along Figure 3 Schematic cross-sectional view of line VV in FIG.

[0023] Figure 6 yes Figure 2 An enlarged view of the area around the pawl shaft.

[0024] Figure 7 yes Figure 3 Schematic left side view of the second box.

[0025] Figure 8 yes Figure 1 A schematic right side view of the first box body.

[0026] Description of Reference Numerals

[0027] 1…transmission device; 2…transmission mechanism; 3…gear box; 3A…first housing;

[0028] 3B…second housing; 3C…fastener; 3D…fastening hole; 3E…support portion adjacent region;

[0029] 5…parking lock mechanism; 21…input gear; 31…ventilation chamber; 31A…chamber 1;

[0030] 31B…Room 2; 31C…Preparatory room; 31D…Communication section; 34…First support section;

[0031] 35 ... second supporting portion; 37 ... reinforcing portion; 51 ... pawl shaft; 52 ... parking pawl;

[0032] 53…torsion spring; 212…input shaft; 341…boss; 342…bushing;

[0033] 343 ... first bottom surface; 351 ... insertion opening; 352 ... second bottom surface; 353 ... groove;

[0034] 511 ... first end portion; 511A ... end surface; 512 ... second end portion; 512A ... end surface;

[0035] 513…connecting hole; 521…engaging portion. DETAILED DESCRIPTION

[0036] Embodiments to which the present disclosure is applied are described below with reference to the drawings.

[0037] [1. First embodiment]

[0038] [1-1. Structure]

[0039] Figure 1 The transmission device 1 shown is provided in a vehicle and is a transmission device for transmitting power of a driving source of the vehicle to wheels.

[0040] The transmission device 1 includes a transmission mechanism 2, a gear box 3, and a parking lock mechanism 5. The transmission device 1 is installed in a vehicle with the direction parallel to the rotation axis L1 of the input gear 21 of the transmission mechanism 2 as the left-right direction and the direction in which the input gear 21 is arranged relative to the ring gear 23 as the front direction.

[0041] <Transmission Mechanism>

[0042] like Figure 2 As shown, the transmission mechanism 2 has an input gear 21 , a pinion 22 , a ring gear 23 , a differential case 24 , and a differential mechanism 25 .

[0043] <Input gear>

[0044] The input gear 21 is an external gear that is drivingly connected to a motor (not shown) and is axially rotated by the driving force of the motor.

[0045] The rotation axis L1 of the input gear 21 is parallel to the left-right direction. The input gear 21 includes a gear portion 211 and an input shaft 212 connected concentrically 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 includes a parking gear 212A.

[0046] <Sub-gear>

[0047] The sub gear 22 has a rotation axis L2 that is parallel to the rotation axis L1 of the input gear 21 .

[0048] The rotation axis L2 of the auxiliary gear 22 is located behind the rotation axis L1 of the input gear 21 and above the rotation axis L1 of the input gear 21 and the rotation axis L3 of the ring gear 23 (see Figure 1 ). The auxiliary gear 22 includes a first gear 221 and a second gear 222 .

[0049] The first gear 221 is an external gear meshing with the input gear 21. The second gear 222 is an external gear meshing with the ring gear 23. The outer diameter of the second gear 222 is smaller than that of the first gear 221, and the second gear 222 is arranged concentrically with the first gear 221. The second gear 222 is arranged on the right side of the first gear 221.

[0050] <Ring gear>

[0051] 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 behind the rotation axis L2 of the pinion gear 22. The ring gear 23 rotates the differential case 24 by the rotational force transmitted from the pinion gear 22.

[0052] <Differential case>

[0053] The differential case 24 is fixed to the ring gear 23 and rotates together with the ring gear 23 around the rotation axis L3 of the ring gear 23. Figure 3 As shown, the differential case 24 includes a differential mechanism accommodating portion 241 , a first shaft portion 243 , and a second shaft portion 244 .

[0054] 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.

[0055] <Differential Mechanism>

[0056] The differential mechanism 25 is a known mechanism that causes the first output shaft and the second output shaft to rotate at different speeds and distributes and transmits the rotation of the differential case 24 to the first output shaft and the second output shaft. The differential mechanism 25 is disposed inside the differential mechanism accommodating portion 241 .

[0057] The differential mechanism 25 includes two side gears respectively connected to the first output shaft and the second output shaft, and two pinion gears for transmitting the rotation of the differential case 24 to the two side gears.

[0058] The rotation axis of the first output shaft and the second output shaft coincides with the rotation axis of the ring gear 23. The first output shaft and the second output shaft rotate differentially and rotate in accordance with the rotation direction of the input gear 21 (ie, the rotation direction of the differential case 24).

[0059] <Parking lock mechanism>

[0060] like Figure 3 As shown, the parking lock mechanism 5 includes a pawl shaft 51 , a parking pawl 52 , and a torsion spring 53 .

[0061] <Pawl shaft>

[0062] The ratchet shaft 51 is a shaft portion having an axis L4 parallel to the rotation axis L1 of the input shaft 212. The ratchet shaft 51 is supported by the gear box 3. The ratchet shaft 51 is arranged in a direction orthogonal to both the axial direction and the up-down direction of the input shaft 212 (i.e., the front-to-back direction), between the inner surface of the input shaft 212 intersecting the front-to-back direction of the gear box 3 (specifically, the inner surface of the front wall 3G), and at a position lower than the ventilation chamber 31.

[0063] <Parking Pawl>

[0064] The parking pawl 52 can be centered on the pawl shaft 51. Figure 4 The locked position shown in the dashed line and Figure 4 The parking pawl 52 is swung to the lock release position shown by the solid line. In the lock position, the parking pawl 52 is engaged with the parking gear 212A of the input shaft 212 to restrict the rotation of the input shaft 212. In the lock release position, the parking pawl 52 is disengaged from the input shaft 212.

[0065] Specifically, the parking pawl 52 has an engagement portion 521 that engages with the parking gear 212A provided on the outer peripheral surface of the input shaft 212 from the radially outer side of the input shaft 212 (specifically, from below).

[0066] <Torsion Spring>

[0067] The torsion spring 53 is wound around the pawl shaft 51 and urges the parking pawl 52 toward the lock release 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 pawl 52.

[0068] like Figure 5 As shown, the torsion spring 53 is arranged on the opposite side of the first support portion 34 of the gear case 3 across the parking pawl 52. That is, the torsion spring 53 is wound around a region of the pawl shaft 51 on the right side of the parking pawl 52.

[0069] The parking pawl 52 is moved to the locked position by an input in the locking direction from an actuator (not shown), and is returned to the unlocked position by an input in the unlocking direction from the actuator and the biasing force of the torsion spring 53 .

[0070] <Gearbox>

[0071] like Figure 2 As shown, the gearbox 3 accommodates the transmission mechanism 2 and the parking lock mechanism 5. The gearbox 3 has a first case 3A and a second case 3B, which sandwich the transmission mechanism 2 and the parking lock mechanism 5 in the axial direction of the input gear 21 (ie, the left-right direction).

[0072] The first housing 3A and the second housing 3B are fixed to each other in the left-right direction by a plurality of fasteners 3C (such as bolts), thereby forming an internal space for accommodating the transmission mechanism 2 and the parking lock mechanism 5. Figure 2 In the figure, the portion of the first housing 3A that accommodates a motor (not shown) serving as a driving source is omitted from illustration.

[0073] <Ventilation Room>

[0074] like Figure 1 As shown, the gear box 3 has a breather chamber 31 and a breather pipe 32 .

[0075] The breather chamber 31 is a space that connects the internal space that accommodates the transmission mechanism 2 and the parking lock mechanism 5 with the outside of the gear box 3. The breather chamber 31 separates the oil mist from the ventilation air including the oil mist in the internal space of the gear box 3. The air from which the oil mist has been separated is discharged to the outside of the gear box 3 from the breather pipe 32.

[0076] like Figure 3 As shown, the ventilation chamber 31 has a first chamber 31A, a second chamber 31B, a preliminary chamber 31C, a communication portion 31D, and a first communication port 31E (see Figure 1 ), and the second communication port 31F (see Figure 1 ).

[0077] like Figure 3 As shown, the first chamber 31A communicates with the internal space of the gear box 3 via the communication portion 31D. The first chamber 31A also communicates with the reserve chamber 31C and the second chamber 31B. The communication portion 31D communicates the inside of the breather chamber 31 with the outside of the breather chamber 31 in the internal space of the gear box 3.

[0078] The second chamber 31B is disposed above the first chamber 31A. The second chamber 31B is a room into which ventilation air flows from the first chamber 31A. Figure 1 As shown, the second chamber 31B communicates with the first chamber 31A via the first communication port 31E. In addition, the second chamber 31B communicates with the vent pipe 32 via the second communication port 31F.

[0079] The preliminary chamber 31C is disposed in front of the first chamber 31A and the second chamber 31B. The preliminary chamber 31C is a room into which part of the ventilation air flows through the communication portion 31D. The preliminary chamber 31C is not directly communicated with the second chamber 31B.

[0080] The first chamber 31A, the second chamber 31B, and the reserve chamber 31C are arranged to span the first housing 3A and the second housing 3B. Specifically, the above chambers are composed of ribs protruding from the inner surface intersecting the left-right direction of the first housing 3A and ribs protruding from the inner surface intersecting the left-right direction of the second housing 3B. The communication portion 31D is also provided to span the first housing 3A and the second housing 3B.

[0081] The first communication port 31E and the second communication port 31F are provided only in the first housing 3A, but not in the second housing 3B. That is, the first communication port 31E and the second communication port 31F are arranged on the right side of the gear box 3. On the other hand, the communication port 31G between the first chamber 31A and the reserve chamber 31C is arranged on the left side of the gear box 3 (see Figure 3 ).

[0082] The ventilation air in the gear box 3 flows into the preparatory chamber 31C and the first chamber 31A through the communication portion 31D. The ventilation air flowing into the first chamber 31A flows to the right through the first communication port 31E and flows into the second chamber 31B. The ventilation air flowing into the second chamber 31B passes through the second communication port 31F and is discharged from the ventilation pipe 32 to the outside of the gear box 3. The oil mist included in the ventilation air is separated from the air in the process of flowing through the ventilation chamber 31.

[0083] <First Supporting Part, Second Supporting Part, and Reinforcing Part>

[0084] like Figure 5 As shown, the gear case 3 includes a first support portion 34 , a second support portion 35 , and a reinforcement portion 37 .

[0085] like Figure 6 As shown, the first support portion 34 supports the first end portion 511 (ie, the left end portion) of the pawl shaft 51. The first support portion 34 includes a boss 341, a bushing 342, and a first bottom surface 343.

[0086] The boss 341 is a portion protruding rightward from the inner surface intersecting the left-right direction of the second housing 3B. The bushing 342 is a cylindrical member press-fitted into the boss 341. The bushing 342 contacts the first end 511 of the pawl shaft 51 over the entire circumference.

[0087] The protruding end surface (i.e., the right end surface) of the boss 341 contacts or approaches the parking pawl 52. In addition, the parking pawl 52 contacts the step 514 of the pawl shaft 51. The step 514 is a portion where the right area of ​​the pawl shaft 51 is enlarged in diameter relative to the left area. In addition, instead of the protruding end surface of the boss 341, the right end surface of the bushing 342 may contact or approach the parking pawl 52.

[0088] The parking pawl 52 is positioned by being sandwiched between the first support portion 34 and the step 514 in the axial direction of the pawl shaft 51. The first end 511 of the pawl shaft 51 has an outer diameter smaller than that of the second end 512 (ie, the right end) on the opposite side.

[0089] The first bottom surface 343 faces the end surface 511A of the first end portion 511 in the axial direction of the pawl shaft 51. The first bottom surface 343 is disposed at a distance from the end surface 511A of the first end portion 511. That is, a first buffer space S1 into which air is introduced is formed between the first bottom surface 343 and the first end portion 511.

[0090] The first buffer space S1 communicates with a communication hole 513 extending from an end surface 511A of the first end portion 511 of the pawl shaft 51 to an end surface 512A of the second end portion 512. In the first buffer space S1, no flow path communicating with the outside of the first support portion 34 is connected except for the communication hole 513.

[0091] That is, no gap or groove is provided between the first end portion 511 and the bushing 342 and between the bushing 342 and the boss 341 . The air in the first buffer space S1 can flow to the outside of the first support portion 34 only through the communication hole 513 .

[0092] like Figure 7 As shown, the first support portion 34 (specifically, the boss 341) constitutes a portion of the wall of the ventilation chamber 31. Specifically, the first support portion 34 constitutes the lower wall of the preliminary chamber 31C and constitutes a portion of the communication portion 31D (ie, the side wall of the communication portion 31D).

[0093] As described above, since the first support portion 34 constitutes a part of the wall of the breather chamber 31, the pawl shaft 51 supported by the first support portion 34 suppresses the oil from intruding into the breather chamber 31. Therefore, the oil can be suppressed from being released from the breather pipe 32.

[0094] like Figure 6 As shown, the second support portion 35 supports the second end portion 512 of the pawl shaft 51. The second support portion 35 is formed by a recessed portion formed by punching the inner surface intersecting the left-right direction of the first housing 3A. That is, the second support portion 35 does not have a boss.

[0095] Therefore, when the parking pawl 52 is in the locked position, the first stiffness of the second support portion 35 with respect to the first locking load F1 and the second stiffness with respect to the second locking load F2 borne from the parking pawl 52 are respectively greater than the first stiffness of the first support portion 34 with respect to the first locking load F1 and the second stiffness with respect to the second locking load F2 borne from the parking pawl 52.

[0096] like Figure 7 and Figure 8 As shown, the first lock load F1 is a load generated on the first support portion 34 and the second support portion 35 when the input shaft 212 rotates in the first direction D1, and is a load directed downward and rearward. The first direction D1 is the direction in which the input shaft 212 rotates when the vehicle moves forward.

[0097] The second lock load F2 is a load generated on the first support portion 34 and the second support portion 35 when the input shaft 212 rotates in the second direction D2, which is the opposite direction to the first direction D1. The second direction D2 is the direction in which the input shaft 212 rotates when the vehicle is reversed.

[0098] Furthermore, when both the first support portion 34 and the second support portion 35 have a boss protruding from the inner surface of the gear case 3 , the first rigidity and the second rigidity become higher as the outer diameter of the boss increases.

[0099] like Figure 6 As shown in the figure, the second support portion 35 has an insertion port 351, a second bottom surface 352, and a groove 353. The insertion port 351 is an opening for inserting the second end portion 512, and is provided on an inner surface intersecting the left-right direction of the first housing 3A. The second bottom surface 352 is opposite to the end surface 512A of the second end portion 512 in the axial direction of the pawl shaft 51.

[0100] The second bottom surface 352 is disposed at a distance from the end surface 512A of the second end portion 512. That is, a second buffer space S2 for air to enter is formed between the second bottom surface 352 and the second end portion 512. The second buffer space S2 communicates with the communication hole 513 of the pawl shaft 51.

[0101] The groove 353 is a slit extending from the second bottom surface 352 to the insertion port 351. The groove 353 communicates the second buffer space S2 and the outside of the second support portion 35. The groove 353 is provided in a circumferential portion of the side wall covering the second end portion 512 from the radially outer side.

[0102] The air in the second buffer space S2 is discharged to the outside of the second support portion 35 via the groove 353. The air in the first buffer space S1 is also discharged to the outside of the second support portion 35 via the communicating hole 513, the second buffer space S2, and the groove 353.

[0103] like Figure 8 As shown, when viewed from the axial direction of the pawl shaft 51 , a virtual straight line V2 connecting the axial core L4 of the pawl shaft 51 and the center of the groove 353 intersects the directions of the first lock load F1 and the second lock load F2 .

[0104] The first support portion 34 and the second support portion 35 are respectively arranged closer to the inner surface of the gear case 3 intersecting the longitudinal direction (ie, the inner surface of the front wall 3G) than the input shaft 212 in the longitudinal direction.

[0105] like Figure 7As shown, the reinforcement portion 37 connects the support portion adjacent region 3E and the first support portion 34 to each other in a direction orthogonal to the axial direction of the input shaft 212 (that is, in the radial direction of the pawl shaft 51 ).

[0106] The support portion adjacent area 3E is an area (i.e., a portion of the front wall 3G) on the side opposite to the engaging portion 521 across the pawl shaft 51 in the outer frame of the gear box 3. In other words, the support portion adjacent area 3E is an area in the outer frame of the gear box 3 where the distance from the first support portion 34 is smaller than the distance from the engaging portion 521.

[0107] like Figure 4 As shown, the reinforcing portion 37 protrudes from the inner surface intersecting the left-right direction of the second housing 3B and is formed integrally with the boss 341 and the supporting portion adjacent region 3E of the first supporting portion 34. The width of the reinforcing portion 37 in the vertical direction increases toward the front.

[0108] like Figure 4 As shown, the second housing 3B has a plurality of fastening holes 3D in its outer frame portion, and the plurality of fastening holes 3D are inserted through the fasteners 3C along the left-right direction. The plurality of fastening holes 3D are arranged at the same time as the plurality of fastening holes 3F (see Figure 1 ) are overlapped, a plurality of fastening holes 3F are provided on the first box body 3A.

[0109] In addition, when viewed from the axial direction of the input shaft 212, a fastener 3C is present in a specific area A where a distance D is less than half of the reference width of the parking pawl 52, wherein the distance D represents the distance from a virtual straight line V1 extending from the center line of the parking pawl 52 in the locked position in the support portion adjacent area 3E.

[0110] The “reference width of the parking pawl 52 ” refers to the width of a portion of the parking pawl 52 including the axial core L4 of the pawl shaft 51 (ie, the length in a direction orthogonal to the center line).

[0111] [1-2. Effect]

[0112] According to the embodiments described in detail above, the following effects can be obtained.

[0113] (1a) The air in the first support portion 34 is sent to the second support portion 35 through the communicating hole 513 of the ratchet shaft 51. Furthermore, the air in the second support portion 35 is discharged to the outside of the second support portion 35 through the groove 353 of the second support portion 35. Thus, when the ratchet shaft 51 is inserted into the first support portion 34 and the second support portion 35, the air can be extracted from the first support portion 34 and the second support portion 35.

[0114] (1b) By providing the groove 353 only in the second support portion 35 having a higher rigidity against the lock load received from the pawl shaft 51 , the strength of each of the first support portion 34 and the second support portion 35 can be maintained.

[0115] (1c) By making the virtual straight line V2 connecting the axis L4 of the pawl shaft 51 and the center of the groove 353 intersect the directions of the lock loads F1 and F2, it is possible to suppress a reduction in the strength of the second support portion 35 due to the groove 353.

[0116] (1d) The first support portion 34 has the bushing 342 inserted into the boss 341. Therefore, the presence of the torsion spring 53 can improve the strength of the first support portion 34, which is closer to the parking pawl 52 than the second support portion 35. In other words, the strength of the first support portion 34, which receives a greater load from the parking pawl 52, can be improved.

[0117] [2. Other embodiments]

[0118] The embodiments of the present disclosure are described above, but the present disclosure is not limited to the above embodiments and can take various forms.

[0119] (2a) In the transmission device of the above embodiment, a straight line connecting the axial core of the pawl shaft and the center of the groove when viewed from the axial direction of the pawl shaft may be parallel to the direction of the lock load.

[0120] (2b) In the transmission device of the above embodiment, the torsion spring may be disposed on the left side of the parking pawl. In addition, the first support portion may not necessarily have the boss and the bushing.

[0121] (2c) In the transmission device of the above embodiment, the gear box may not have the first housing and the second housing. In other words, the gear box may not be composed of components that are divided along the axial direction of the input gear.

[0122] (2d) The function of one component in the above-mentioned embodiment may be shared by multiple components, or the functions of multiple components may be integrated into one component. In addition, a part of the structure of the above-mentioned embodiment may be omitted. In addition, at least a part of the structure of the above-mentioned embodiment may be added to the structure of the above-mentioned other embodiment, or at least a part of the structure of the above-mentioned embodiment may be replaced with the structure of the above-mentioned other embodiment, etc. In addition, all the modes included in the technical idea determined by the sentences recorded in the claims are embodiments of the present disclosure.

Claims

1. A transmission device, comprising: A transmission mechanism having an input shaft; Park lock mechanism; and a gear box, the gear box accommodating the transmission mechanism and the parking lock mechanism, The transmission device is characterized in that The parking lock mechanism has: a pawl shaft having an axis parallel to a rotation axis of the input shaft; and The parking pawl can swing between a locking position and a locking release position with the pawl shaft as the center, wherein: The locked position is a position where the rotation of the input shaft is restricted by the engagement of the parking pawl with the input shaft, and the unlocked position is a position where the parking pawl is disengaged from the input shaft, and the gear box has: a first supporting portion that supports a first end portion of the pawl shaft; and a second support portion, the second support portion supporting a second end portion of the pawl shaft located on the opposite side of the first end portion, and when the parking pawl is located at the locked position, the second support portion has a stiffness greater than a stiffness of the first support portion for the locking load received from the parking pawl, The pawl shaft has a connecting hole extending from the end surface of the first end portion to the end surface of the second end portion. The first supporting portion is in contact with the first end portion in the entire circumferential direction, The second supporting portion comprises: an insertion port into which the second end portion is inserted; a bottom surface, the bottom surface being opposite to the end surface of the second end portion in the axial direction of the pawl shaft; as well as A groove extends from the bottom surface to the insertion port.

2. The transmission device according to claim 1, characterized in that: When viewed from the axial direction of the pawl shaft, a straight line connecting the axial core of the pawl shaft and the center of the groove intersects the direction of the locking load.

3. The transmission device according to claim 1 or 2, characterized in that: The parking lock mechanism includes a torsion spring that is wound around the pawl shaft and urges the parking pawl toward the lock release position. The torsion spring is arranged on the side opposite to the first support portion across the parking pawl. The first supporting portion comprises: a boss protruding from an inner surface of the gear case; and A bushing is inserted into the interior of the boss.

Images