Parklock mechanism

Abstract

To provide a park lock mechanism in which a power transmission mechanism can be reduced in size.SOLUTION: A park lock mechanism 100 comprises: a park gear 10 rotating together with a power transmission shaft 4 of a power transmission mechanism; a park pole 30 for non-rotatably fixing the power transmission shaft at an engagement position where it is engaged with the park gear; a detent plate 50 having at least a first recess and a second recess, and changing a position of the park pole according to a rotation angle; an engagement member 60 accommodated in a breather passage 3, and engaged with either of the first recess and the second recess according to the rotation angle of the detent plate; and an energization member accommodated in the breather passage, and energizing the engagement member toward the detent plate. In a state that the engagement member is engaged with the first recess, the engagement member blocks the breather passage, and in a state that the engagement member is engaged with the second recess, the breather passage makes the inside and the outside of the case communicate with each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a park lock mechanism.

Background Art

[0002] Patent Document 1 discloses a park lock mechanism of a transmission including a park gear fixed to an output shaft, a park pole that engages with the park gear to lock the output shaft, a detent lever that changes the position of the park pole according to its rotation angle, and an actuator that changes the position of the park pole by changing the rotation angle of the detent lever. In this park lock mechanism, a park pole engages with the park gear, and the output shaft is in a locked state in the P (parking) range, and the park pole does not engage with the park gear, and the output shaft is in a state where the lock is released in the non-P range. The switching is performed by changing the rotation angle of the detent lever.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a power transmission mechanism such as a transmission, further miniaturization is required in consideration of the mountability on a vehicle.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a park lock mechanism capable of miniaturizing a power transmission mechanism.

Means for Solving the Problems

[0006] According to one aspect of the present invention, a power transmission mechanism having a case and a breather passage that connects the inside and outside of the case, wherein a park lock mechanism provided in the case includes a park gear that rotates together with the power transmission shaft of the power transmission mechanism, a park pole that fixes the power transmission shaft so as not to rotate in a meshing position that meshes with the park gear, a detent plate having at least a first recess and a second recess and changing the position of the park pole according to the rotation angle, an engaging member housed in the breather passage that engages with either the first recess or the second recess according to the rotation angle of the detent plate, and a biasing member housed in the breather passage that biases the engaging member toward the detent plate, wherein when the engaging member is engaged with the first recess, the engaging member closes the breather passage, and when the engaging member is engaged with the second recess, the breather passage connects the inside and outside of the case. [Effects of the Invention]

[0007] In one aspect of the present invention, depending on the rotation angle of the detent plate, the breather passage is closed when the engaging member engages with a first recess of the detent plate, and the breather passage communicates the inside and outside of the case when the engaging member engages with a second recess of the detent plate. Furthermore, the rotational position of the detent plate can be fixed by the engaging member and the biasing member, and the engaging member functions as a lid that opens and closes the breather passage. Therefore, there is no need to separately provide a detent spring to fix the detent plate and a breather chamber at the top of the case. Thus, a park lock mechanism that enables miniaturization of the power transmission mechanism can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a diagram showing the configuration of a power transmission mechanism equipped with a park lock mechanism according to an embodiment of the present invention. [Figure 2] Figure 2 is a perspective view of the park lock mechanism, showing the park pole in the engaged position. [Figure 3]Figure 3 is a perspective view of the park lock mechanism, showing the park pole in the released position. [Figure 4] Figure 4 is a cross-sectional view of the vicinity of the breather passage in the power transmission mechanism, showing the park pole in the engaged position. [Figure 5] Figure 5 is an enlarged view of the vicinity of the engaging member in Figure 4. [Figure 6] Figure 6 is a cross-sectional view of the area near the breather passage in the power transmission mechanism, showing the park pole in the released position. [Figure 7] Figure 7 is an enlarged view of the vicinity of the engaging member in Figure 6. [Modes for carrying out the invention]

[0009] Hereinafter, a park lock mechanism 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0010] First, with reference to Figure 1, the reduction gear 1, which is a power transmission mechanism equipped with a park lock mechanism 100, will be described. Figure 1 is a diagram showing the configuration of the reduction gear 1 equipped with a park lock mechanism 100.

[0011] The reduction gear 1 is mounted, for example, on a vehicle (not shown). The reduction gear 1 reduces the power of an electric motor, which is the drive source, and transmits it to the drive wheels (not shown). The reduction gear 1 can be switched between the parking range (hereinafter referred to as "P range") and the driving range (hereinafter referred to as "D range") based on the driver's operation of the shift lever (not shown). The reduction gear 1 comprises a case 2, a breather passage 3, a power transmission shaft 4, and a park lock mechanism 100.

[0012] Case 2 houses the components of the reduction gear 1, including the power transmission shaft 4 and the park lock mechanism 100. Case 2 also houses oil for lubricating and cooling the reduction mechanism (not shown), including the power transmission shaft 4 of the reduction gear 1. Case 2 has a cylindrical breather passage forming portion 2a that protrudes laterally.

[0013] The breather passage 3 is formed on the inner circumference of the breather passage forming portion 2a. The breather passage 3 is a passage having a circular cross-sectional shape of the flow path. The breather passage 3 communicates the inside and outside of the case 2 to release the increased internal pressure to the outside as the temperature in the speed reducer 1 rises, thereby preventing the increase in the internal pressure of the speed reducer 1. The breather passage 3 opens in the lateral direction of the case 2. The breather passage 3 will be described in detail later while referring to FIGS. 4 and 5.

[0014] The power transmission shaft 4 is a shaft that transmits the power of the electric motor to the drive wheels. The power transmission shaft 4 rotates and transmits power when the electric motor is rotating, and stops when the electric motor is stopped.

[0015] The park lock mechanism 100 is provided inside the case 2. The park lock mechanism 100 mechanically fixes the power transmission shaft 4 of the speed reducer 1 when the P range is selected by operating the shift lever.

[0016] Subsequently, referring to FIGS. 2 to 5 together, the configuration of the park lock mechanism 100 will be described.

[0017] FIG. 2 is a perspective view of the park lock mechanism 100, showing a state where the park pole 30 is in the engaged position. FIG. 3 is a perspective view of the park lock mechanism 100, showing a state where the park pole 30 is in the released position. FIG. 4 is a cross-sectional view of the vicinity of the breather passage 3 in the speed reducer 1, showing a state where the park pole 30 is in the engaged position. FIG. 5 is an enlarged view of the vicinity of the ball 60 in FIG. 4.

[0018] As shown in FIGS. 2 and 3, the park lock mechanism 100 includes a park gear 10, a park rod 20, a park pole 30, a park wedge 40, a detent plate 50, a ball 60 as an engaging member, a coil spring 70 as a biasing member, and an actuator 80.

[0019] The park gear 10 meshes with the power transmission shaft 4 and rotates or stops together with the power transmission shaft 4. A plurality of tooth portions 11 that engage with a claw portion 32 (described later) of the park pole 30 are provided at predetermined intervals on the outer edge portion of the park gear 10.

[0020] The park rod 20 is formed of a rod-shaped member. A park wedge 40 is attached near the tip of the park rod 20. The proximal end of the park rod 20 is connected to the actuator 80.

[0021] The park pole 30 is a rod-shaped member having a pair of flat first side surfaces 30a and second side surfaces 30b. The park pole 30 has a through hole 31 formed near the center in the longitudinal direction and penetrating the first side surface 30a and the second side surface 30b, a claw portion 32 that engages with the tooth portion 11 of the park gear 10, and a sliding contact surface 33 with which the park wedge 40 slides.

[0022] A support shaft 34 (see FIG. 1) for swingably supporting the park pole 30 is inserted into the through hole 31.

[0023] The claw portion 32 is provided at one end portion of the park pole 30 in the longitudinal direction. When the claw portion 32 enters between a pair of adjacent tooth portions 11 of the park gear 10, the tooth portion 11 and the claw portion 32 engage with each other.

[0024] The sliding contact surface 33 is provided near the other end portion of the park pole 30 in the longitudinal direction. The sliding contact surface 33 slides on a tapered surface 41 (described later) of the park wedge 40. Thereby, the park pole 30 rotates about the support shaft 34 according to the sliding contact position with the tapered surface 41.

[0025] That is, the park pole 30 swings about the support shaft 34 inserted into the through hole 31 according to the movement of the park rod 20. The park pole 30 fixes the power transmission shaft 4 so as not to rotate at the meshing position (the position shown in FIG. 2) where it meshes with the park gear 10.

[0026] When the park pole 30 swings, the engagement state between the teeth 11 of the park gear 10 and the claw 32 of the park pole 30 is changed. The park pole 30 becomes rotatable by releasing the fixing of the power transmission shaft 4 when it is in the disengaged position (the position shown in Figure 3) where it does not mesh with the park gear 10. When no external force is acting on the park pole 30, the biasing force of the return spring (not shown) holds the park pole 30 in the disengaged position where the engagement between the teeth 11 of the park gear 10 and the claw 32 of the park pole 30 is released.

[0027] The park wedge 40 is a cylindrical member. The park wedge 40 has a tapered surface 41 that narrows towards the tip of the park rod 20. The park wedge 40 moves axially with the park rod 20 as the actuator 80 operates. As the park wedge 40 moves axially, the outer diameter of the tapered surface 41 at the position where it contacts the sliding contact surface 33 changes, allowing the park pole 30 to swing between the engaged position and the disengaged position.

[0028] The detent plate 50 changes the position of the park pole 30 by changing the axial position of the park rod 20 and the park wedge 40 according to the rotation angle. The detent plate 50 has a plurality of recesses 51, 52. Specifically, the detent plate 50 has a first recess 51 and a second recess 52. The detent plate 50 rotates substantially horizontally around the rotation axis 53.

[0029] As shown in Figure 4, the first recess 51 and the second recess 52 are provided so as to be aligned in the circumferential direction of the detent plate 50. The first recess 51 and the second recess 52 are formed to be recessed from the outer circumference toward the rotation axis 53. The first recess 51 is formed to be recessed more significantly toward the rotation axis 53 than the second recess 52.

[0030] The ball 60 is housed in the breather passage 3. The ball 60 engages with one of the plurality of recesses 51, 52. That is, the ball 60 engages with either the first recess 51 or the second recess 52 depending on the rotation angle of the detent plate 50. The ball 60 is pressed toward the detent plate 50 by the coil spring 70 and engages with either the first recess 51 or the second recess 52, thereby fixing the rotational position of the detent plate 50.

[0031] The ball 60 constitutes a valve body that switches the opening and closing of the breather passage 3. When the ball 60 is engaged with the first recess 51, the ball 60 closes the breather passage 3. On the other hand, when the ball 60 is engaged with the second recess 52, the breather passage 3 connects the inside and outside of the case. In other words, the ball 60 functions as a lid that opens and closes the breather passage 3.

[0032] Here, the breather passage 3 has an opening 3a that opens to the inside of the case 2 and an opening 3b that opens to the outside of the case 2. The breather passage 3 is provided with a ball 60, a coil spring 70, a fixed member 71, and a movable member 72.

[0033] The fixing member 71 is formed in a substantially cylindrical shape. The fixing member 71 is fitted onto the inner circumferential surface of the outer opening end of the breather passage 3. The fixing member 71 immovably supports one end of the coil spring 70.

[0034] The movable member 72 is formed in a substantially disc shape. The movable member 72 is inserted into the breather passage 3 so as to be movable in the axial direction. The movable member 72 abuts against the other end of the coil spring 70 and holds the coil spring 70 between itself and the fixed member 71. A ball 60 abuts against the movable member 72 at approximately the center of the plane opposite to the plane that abuts against the coil spring 70.

[0035] The movable member 72 moves toward the opening 3a of the breather passage 3 when the coil spring 70 is extended, and moves toward the opening 3b of the breather passage 3 when the coil spring 70 is contracted. The movable member 72 has a plurality of through holes 72a.

[0036] The through-hole 72a penetrates the movable member 72 in the thickness direction. The presence of the through-hole 72a prevents the breather passage 3 from being blocked even when the movable member 72 is installed. The through-hole 72a is not formed in the center of the movable member 72 where the ball 60 abuts. Multiple through-holes 72a are provided on the flat surface of the movable member 72, spaced apart in the circumferential direction.

[0037] The opening 3a is formed such that its inner diameter decreases towards the inner circumferential end of the opening. As a result, the opening 3a constitutes a valve seat on which the ball 60 sits. The opening 3a is closed when the ball 60 is fitted into it. When the ball 60 moves toward the opening 3b, an annular gap is created between the ball 60 and the opening 3a. This opens the breather passage 3, which connects the inside and outside of the case 2.

[0038] The opening 3b is formed by penetrating the fixing member 71 in the axial direction. The opening 3b constitutes the outer opening of the breather passage 3.

[0039] In this way, the breather passage 3 is formed so as to extend laterally from the detent plate 50 which rotates in a nearly horizontal direction and to open laterally toward the case 2. Therefore, the breather passage 3 can be formed without significantly changing the configuration of the park lock mechanism provided in power transmission mechanisms such as typical automatic transmissions. In addition, the height of the case 2 can be reduced.

[0040] The coil spring 70 is housed in the breather passage 3. The coil spring 70 expands and contracts along the extending direction of the breather passage 3. The coil spring 70 biases the ball 60 toward the detent plate 50. The coil spring 70 is held between the fixed member 71 and the movable member 72.

[0041] As described above, depending on the rotation angle of the detent plate 50, when the ball 60 is engaged with the first recess 51 of the detent plate 50, the breather passage 3 is closed, and when the ball 60 is engaged with the second recess 52 of the detent plate 50, the breather passage 3 connects the inside and outside of the case 2. Therefore, since the park lock mechanism 100 is provided with a mechanism to open and close the breather passage 3, there is no need to provide a separate breather chamber at the top of the case 2. In addition, the rotational position of the detent plate 50 can be fixed by the ball 60 and the coil spring 70, and the ball 60 functions as a lid to open and close the breather passage 3. Therefore, there is no need to provide a separate detent spring to fix the detent plate 50. Thus, a park lock mechanism 100 that enables miniaturization of the reduction gear 1 can be provided.

[0042] Furthermore, by using a coil spring 70 as a biasing member, air can pass through the hollow gap of the coil spring 70. Therefore, the presence of a biasing member prevents it from affecting communication between the inside and outside of the case 2. In addition, the coil spring 70 can move the ball 60 in the extending direction of the breather passage 3, so the communication state of the opening 3a of the breather passage 3 can be stably controlled.

[0043] The actuator 80 operates in response to the operation of the shift lever. The park rod 20 is connected to the actuator 80. For example, the actuator 80 can be a hydraulic actuator, an electric actuator, or the like.

[0044] Next, the specific operation of the park lock mechanism 100 will be described with reference to Figures 6 and 7.

[0045] Figure 6 is a cross-sectional view of the vicinity of the breather passage 3 in the reduction gear 1, showing the park pole 30 in the released position. Figure 7 is an enlarged view of the vicinity of the ball 60 in Figure 6.

[0046] As shown in Figure 2, when the shift lever is in the P range, the park rod 20 and park wedge 40 move toward the park pole 30. Then, the tapered surface 41 of the park wedge 40 comes into contact with the sliding surface 33 of the park pole 30 and moves to the position shown in Figure 2, pushing the park pole 30 toward the park gear 10. As a result, the park pole 30 swings and moves to the meshing position, and the teeth 11 of the park gear 10 and the claws 32 of the park pole 30 engage (park lock state).

[0047] In this state, the rotation of the power transmission shaft 4, which rotates together with the park gear 10, is mechanically restricted, and both the park gear 10 and the power transmission shaft 4 are unable to rotate. In other words, in the park-locked state, the vehicle's movement is restricted.

[0048] At this time, as shown in Figure 4, the detent plate 50 rotates as the park rod 20 moves axially, so that the first recess 51 faces the breather passage 3. The ball 60 is pressed by the coil spring 70 and engages with the first recess 51, fixing the rotational position of the detent plate 50.

[0049] As described above, the first recess 51 is formed to be more recessed towards the rotation axis 53 than the second recess 52. Therefore, as shown in Figure 5, the ball 60 moves to a position where it protrudes significantly into the case 2 from the breather passage 3 and comes into contact with the opening 3a around its entire circumference. This closes the breather passage 3.

[0050] Thus, when the ball 60 is engaged with the first recess 51, the breather passage 3 is closed by the ball 60 blocking the opening 3a. In other words, the breather passage 3 is closed when the park pole 30 is in the meshed position.

[0051] On the other hand, as shown in Figure 3, when the shift lever is switched from the P range to the D range, the actuator 80 is activated, and the park rod 20 and park wedge 40 move away from the park pole 30. This causes the tapered surface 41 of the park wedge 40 and the sliding contact surface 33 of the park pole 30 to separate. Then, the park pole 30 moves away from the park gear 10 due to the biasing force of the return spring. As a result, the park pole 30 swings to the release position, and the engagement between the teeth 11 of the park gear 10 and the claws 32 of the park pole 30 is released (park lock released state).

[0052] In this state, the park gear 10 and the power transmission shaft 4 are rotatable. In other words, with the park lock released, the vehicle is movable.

[0053] At this time, as shown in Figure 6, the detent plate 50 rotates as the park rod 20 moves axially, so that the second recess 52 faces the breather passage 3. The ball 60 is pressed by the coil spring 70 and engages with the second recess 52, fixing the rotational position of the detent plate 50.

[0054] As described above, the second recess 52 is formed to be smaller than the first recess 51, on the side of the rotation axis 53. Therefore, as shown in Figure 7, the ball 60 is pushed by the detent plate 50 and moves to a position where a portion of it enters the breather passage 3, creating a gap between the outer circumference of the ball 60 and the inner circumference of the opening 3a. This allows the breather passage 3 to communicate.

[0055] Thus, when the ball 60 is engaged with the second recess 52, the ball 60 disengages from the opening 3a, allowing the breather passage 3 to connect the inside and outside of the case 2. In other words, the breather passage 3 connects the inside and outside of the case 2 when the park pole 30 is in the released position.

[0056] As described above, the breather passage 3 is closed when the park pole 30 is in the engaged position and opens when the park pole 30 is in the released position, thus connecting the inside and outside of the case 2 when the reduction gear 1 is operating and the power transmission shaft 4 is rotating. Therefore, even if the temperature inside the reduction gear 1 rises due to the operation of the reduction gear 1, the increased internal pressure can be released to the outside.

[0057] The configuration and effects of this embodiment will now be explained in summary.

[0058] (1) A reduction gear 1 having a case 2 and a breather passage 3 that connects the inside and outside of the case 2, wherein the park lock mechanism 100 provided inside the case 2 includes a park gear 10 that rotates together with the power transmission shaft 4 of the reduction gear 1, a park pole 30 that fixes the power transmission shaft 4 so that it cannot rotate in a meshing position that meshes with the park gear 10, a detent plate 50 having at least a first recess 51 and a second recess 52 that changes the position of the park pole 30 according to the rotation angle, and a breather passage The breather passage 3 includes a ball 60 housed in the passage 3 that engages with either a first recess 51 or a second recess 52 depending on the rotation angle of the detent plate 50, and a biasing member (coil spring 70) housed in the breather passage 3 that biases the ball 60 toward the detent plate 50. When the ball 60 is engaged with the first recess 51, the ball 60 closes the breather passage 3, and when the ball 60 is engaged with the second recess 52, the breather passage 3 allows the inside and outside of the case 2 to communicate.

[0059] In this configuration, depending on the rotation angle of the detent plate 50, the breather passage 3 is closed when the ball 60 is engaged with the first recess 51 of the detent plate 50, and the breather passage 3 connects the inside and outside of the case 2 when the ball 60 is engaged with the second recess 52 of the detent plate 50. Furthermore, the rotational position of the detent plate 50 can be fixed by the ball 60 and the coil spring 70, and the ball 60 functions as a lid that opens and closes the breather passage 3. Therefore, there is no need to separately provide a detent spring to fix the detent plate 50 and a breather chamber at the top of the case 2. Thus, a park lock mechanism 100 that enables miniaturization of the reduction gear 1 can be provided.

[0060] (2) Preferably, the breather passage 3 has an opening 3a that opens to the inside of the case 2, and when the ball 60 is engaged with the first recess 51, the breather passage 3 is closed by the ball 60 blocking the opening 3a, and when the ball 60 is engaged with the second recess 52, the breather passage 3 is opened by the ball 60 disengaging from the opening 3a, thereby connecting the inside and outside of the case 2.

[0061] In this configuration, when the ball 60 is engaged with the first recess 51, the ball 60 closes the opening 3a that opens to the inside of the case 2, and when the ball 60 is engaged with the second recess 52, the ball 60 disengages from the opening 3a. In this way, the opening and closing of the breather passage 3 is switched between when the ball 60 closes the opening 3a that opens to the inside of the case 2 and when the ball 60 disengages from the opening 3a. Therefore, since the opening and closing of the breather passage 3 can be switched by the position of the ball 60 that fixes the detent plate 50, there is no need to provide a separate breather chamber. Thus, a park lock mechanism 100 that enables miniaturization of the reduction gear 1 can be provided.

[0062] (3) Preferably, the biasing member is a coil spring 70 that expands and contracts in the direction of extension of the breather passage 3.

[0063] In this configuration, the coil spring 70, which expands and contracts in the extending direction of the breather passage 3, biases the ball 60, allowing air to pass through the hollow gap in the coil spring 70. Therefore, the presence of the biasing member prevents it from affecting communication between the inside and outside of the case 2. Furthermore, since the coil spring 70 can move the ball 60 in the extending direction of the breather passage 3, the communication state of the opening 3a of the breather passage 3 can be stably controlled.

[0064] (4) Preferably, the breather passage 3 opens toward the side of the case 2.

[0065] With this configuration, the breather passage 3 is formed so as to extend laterally from the detent plate 50 which rotates in a substantially horizontal direction and to open laterally toward the case 2. Therefore, the breather passage 3 can be formed without significantly changing the configuration of the park lock mechanism provided in power transmission mechanisms such as typical automatic transmissions. In addition, the height of the case 2 can be reduced.

[0066] (5) Preferably, the breather passage 3 is closed when the park pole 30 is in the engaged position and allows communication between the inside and outside of the case 2 when the park pole 30 is in the disengaged position and is not engaged with the park gear 10.

[0067] In this configuration, the breather passage 3 is closed when the park pole 30 is in the engaged position and opens when the park pole 30 is in the released position, thus connecting the inside and outside of the case 2 when the reduction gear 1 is operating and the power transmission shaft 4 is rotating. Therefore, even if the temperature inside the reduction gear 1 rises due to the operation of the reduction gear 1, the increased internal pressure can be released to the outside.

[0068] Although embodiments of the present invention have been described above, these embodiments are merely examples of how the present invention can be applied, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0069] For example, the above embodiment described the case in which the park lock mechanism 100 is applied to the reduction gear 1. However, the park lock mechanism 100 may also be applied to other power transmission mechanisms such as automatic transmissions (stepped transmissions and continuously variable transmissions) that change the speed of power input from an engine as a power source and output it to the drive shaft.

[0070] Furthermore, in the above embodiment, the detent plate 50 has a first recess 51 and a second recess 52, but it may have three or more recesses depending on the number of ranges of the shift lever (for example, reverse range (R range), neutral range (N range), etc.). Also, in the above embodiment, a ball 60 was used as an engaging member that engages with either the first recess 51 or the second recess 52 depending on the rotation angle of the detent plate 50, and a coil spring 70 that expands and contracts in the extending direction of the breather passage 3 was used as a biasing member. However, the engaging member only needs to have a shape that can engage with either the first recess 51 or the second recess 52 depending on the rotation angle of the detent plate 50, so it may be, for example, a cylindrical shape with a spherical tip. Also, the biasing member only needs to be able to bias the engaging member, so it may be an elastic body such as rubber or a disc spring. [Explanation of symbols]

[0071] 100 Park Lock Mechanism 1. Reducer (power transmission mechanism) 2 cases 3 Breezer Passage 3a opening 4 Power transmission shaft 10 Park Gear 30 Park Poles 50 Detent Plates 51 First recess 52 Second recess 60 Ball (engaging member) 70. Coil spring (biasing member)

Claims

1. A power transmission mechanism having a case and a breather passage that connects the inside and outside of the case, wherein a park lock mechanism is provided inside the case, A park gear that rotates together with the power transmission shaft of the power transmission mechanism, A park pole that fixes the power transmission shaft in a non-rotatable position in which it engages with the park gear, A detent plate having at least a first recess and a second recess, which changes the position of the park pole according to the rotation angle, An engaging member housed in the breather passage engages with either the first recess or the second recess depending on the rotation angle of the detent plate, A biasing member housed in the breather passage and biasing the engaging member toward the detent plate, Equipped with, When the engaging member is engaged with the first recess, the engaging member closes the breather passage, and when the engaging member is engaged with the second recess, the breather passage allows the inside and outside of the case to communicate. Parklock mechanism.

2. A park lock mechanism according to claim 1, The breather passage has an opening that opens to the inside of the case, When the engaging member is engaged with the first recess, the breather passage is closed by the engaging member blocking the opening, and when the engaging member is engaged with the second recess, the breather passage is opened by the engaging member disengaging from the opening, allowing the inside and outside of the case to communicate. Parklock mechanism.

3. A park lock mechanism according to claim 1 or 2, The biasing member is a coil spring that expands and contracts in the direction of extension of the breather passage. Parklock mechanism.

4. A park lock mechanism according to any one of claims 1 to 3, The breather passage opens laterally to the case. Parklock mechanism.

5. A park lock mechanism according to any one of claims 1 to 4, The breather passage is closed when the park pole is in the engaged position, and allows communication between the inside and outside of the case when the park pole is in the disengaged position and not engaged with the park gear. Parklock mechanism.

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