Parking lock device

Abstract

To prevent an increase in sliding resistance caused by an attitude change of a movable member while supporting the movable member on a support member via a roller.SOLUTION: The mechanism further includes a linear motion mechanism that converts a rotational output of the electric motor into a linear motion in a first direction, a movable member that moves the lock member by moving linearly in the first direction based on an input in the first direction received from the linear motion mechanism, a support member that supports the movable member in such a manner that the movable member can move in the first direction, and a spring, the movable member includes a first roller that is movable while rotating on the lock member and applies a force in a second direction intersecting the first direction to the lock member, a second roller that is movable while rotating on the support member and applies a force in the second direction to the support member, and a third roller that can abut on the support member or the lock member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a parking lock device. [Background technology]

[0002] In a parking lock device in which a locking member that releasably engages with a parking gear is moved based on the linear movement of a movable member to switch the state of the parking gear between a locked state and an unlocked state, a technology is known in which the locked state is maintained by biasing the movable member with a spring (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German patent number 102009061774 [Patent Document 2] US Patent Application Publication No. 2023 / 0175556 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above-described configuration, the sliding resistance (sliding resistance caused by the linear movement of the movable member) against the support member that movably supports the movable member tends to be large, which leads to the problem of requiring a high output from the electric motor that moves the movable member.

[0005] In response to this, the sliding resistance can be reduced by supporting the movable member on the support member via rollers (for example, Patent Document 2).

[0006] However, when the movable member is supported on the support member via rollers, the number of support points for the movable member by the support member is reduced, which can reduce sliding resistance, but on the other hand, the position of the movable member is more likely to change due to changes in the reaction force from the locking member, etc. If the position of the movable member changes, sliding resistance will occur between the movable member and the support member, which may reduce the effect of the rollers in reducing sliding resistance.

[0007] Therefore, in one aspect, an object of the present disclosure is to prevent an increase in sliding resistance caused by a change in the posture of a movable member while supporting the movable member on a support member via rollers. [Means for solving the problem]

[0008] In one aspect, a powertrain includes an electric motor; a mechanism including a locking member that is releasably engaged with the parking gear, and the locking member is moved based on the output of the electric motor to switch the state of the parking gear between a locked state and an unlocked state; The mechanism comprises: a linear motion mechanism that converts the rotational output of the electric motor into linear motion in a first direction; a movable member that moves linearly in the first direction to move the locking member based on an input in the first direction received from the linear motion mechanism; a support member that supports the movable member in a manner that allows the movable member to move in the first direction; a spring that biases the movable member in the first direction so that the locked state is maintained, The movable member is a first roller that is movable while rotating on the locking member and applies a force to the locking member in a second direction that intersects with the first direction; a second roller that is movable while rotating on the support member and applies a force in the second direction to the support member; and a third roller that can come into contact with the support member or the lock member. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, it is possible to prevent an increase in sliding resistance due to a change in the position of the movable member while supporting the movable member on the support member via rollers. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram (locked state) showing a schematic view of a main part of a parking lock device according to the present embodiment. [Figure 2] 1 is a diagram (unlocked state) showing a schematic view of a main part of a parking lock device according to an embodiment of the present invention. [Figure 3] FIG. 2 is an enlarged view of part Q3 in FIG. [Figure 4] 1. FIG. 4 is a diagram showing a state in which the attitude of the movable member relative to the support member has changed from the nominal attitude, and corresponds to FIG. [Figure 5] FIG. 5 is an enlarged view of part Q5 in FIG. [Figure 6] FIG. 1 is a diagram (locked state) schematically illustrating a main part of a parking lock device according to a comparative example. [Figure 7] FIG. 1 is a diagram (unlocked state) schematically illustrating a main part of a parking lock device according to a comparative example. [Figure 8] 10 is an explanatory diagram showing a state in which the attitude of the parking rod has changed in a comparative example. FIG. [Figure 9] FIG. 10 is an explanatory diagram of a movable member according to a first modified example. [Figure 10] FIG. 10 is an explanatory diagram of a movable member according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limiting. Furthermore, shapes and the like in the drawings may be partially exaggerated for the sake of explanation. Furthermore, in the drawings, for ease of viewing, reference symbols may be assigned only to some of the parts that exist with the same attribute.

[0012] In the following description, unless otherwise specified, "connection" means "mechanical connection" and refers to a connection in a manner that allows power transmission.

[0013] 1 and 2 are diagrams schematically showing the main parts of a parking lock device 1 according to this embodiment, with Fig. 1 showing the locked state and Fig. 2 showing the unlocked state. Fig. 3 is an enlarged view of part Q3 in Fig. 1.

[0014] 1 and 2, the X direction (an example of a first direction) is defined along with an X direction X1 side and an X direction X2 side, and the Z direction (an example of a second direction) is defined along with a Z direction Z1 side and a Z2 side. For ease of explanation, the Z direction is defined as the up-down direction, with the Z1 side as the upper side and the Z2 side as the lower side. The X direction is parallel to the direction in which the rotation shaft of the electric motor 10 extends. In the following explanation, the Y direction is a direction perpendicular to both the X direction and the Z direction, although not shown.

[0015] The parking lock device 1 includes an electric motor 10 and a lock mechanism 21.

[0016] The electric motor 10 is controlled by a control device (not shown). When driven, the electric motor 10 generates a rotational output. The electric motor 10 is connected to the lock mechanism 21 so that the rotational output can be transmitted to the lock mechanism 21.

[0017] The lock mechanism 21 moves the parking pole 42 based on the output of the electric motor 10, thereby switching the state of the parking gear 41 between a locked state (FIG. 1) and an unlocked state (FIG. 2).

[0018] The locking mechanism 21 of this embodiment includes a parking pole 42 , a linear motion mechanism 210 , a head 212 , a spring 214 , and a support member 216 .

[0019] The parking pole 42 is releasably engaged with the parking gear 41. When the parking pole 42 is engaged with the parking gear 41, a locked state is established in which rotation of the parking gear 41 is prevented. When the parking pole 42 is disengaged from the parking gear 41, an unlocked state is established in which rotation of the parking gear 41 is permitted. The parking pole 42 acts on the parking gear 41 in cooperation with a roller 2126, which will be described later, based on the principle of a cam mechanism.

[0020] The linear motion mechanism 210 converts the rotational output of the electric motor 10 into linear motion in the X direction. In this embodiment, the linear motion mechanism 210 is a slide screw mechanism, but it may also be formed by a ball screw mechanism. The linear motion mechanism 210 includes an output member 2100 for extracting the motion in the X direction as an output.

[0021] When the electric motor 10 rotates in a first rotation direction, the output member 2100 moves toward the X1 side in the X direction. When the electric motor 10 rotates in a second rotation direction (opposite to the first rotation direction), the output member 2100 moves toward the X2 side in the X direction.

[0022] The head 212 faces the output member 2100 of the linear motion mechanism 210 in the X direction. In this embodiment, the head 212 is arranged on the X2 side of the output member 2100 in the X direction. The head 212 is arranged coaxially with the output member 2100 of the linear motion mechanism 210. The head 212 may be integrated with the output member 2100, or may be a separate body that can be separated in the X direction. The head 212 and the output member 2100 of the linear motion mechanism 210 are capable of transmitting force in the X direction.

[0023] The head 212 is movable in the X direction. The head 212 directly faces (or is integrated with) the linear motion mechanism 210 on the X1 side in the X direction and has a seat 2120 on the X2 side in the X direction. In this embodiment, the head 212 is not in the form of a rod extending in the X direction, but substantially terminates at the seat 2120 on the X2 side in the X direction. Note that in this embodiment, the seat 2120 has a stopper portion 2122 on its radially inner side (toward the radial center of the spring 214). In the unlocked position, as shown in FIG. 2, the stopper portion 2122 may face the protrusion 2164 of the support member 216 with a gap in the X direction, or may abut against the protrusion 2164 of the support member 216 in the X direction. The stopper portion 2122 forms an end 2125 of the head 212 on the X2 side in the X direction.

[0024] In this embodiment, the head 212 includes two rollers 2124, 2126 and one auxiliary roller 2128. The rollers 2124, 2126 have rotation shafts 80, 81 in the Y direction. The rotation shafts 80, 81 are supported by the head 212 so as to be movable in the X direction together with the head 212. In this case, the rollers 2124, 2126 are movable in the X direction together with the head 212 while rotating around the rotation shafts 80, 81, respectively.

[0025] Specifically, the rollers 2124, 2126 are movable in the X direction between a locked position on the X1 side in the X direction shown in Fig. 1 and an unlocked position on the X2 side in the X direction shown in Fig. 2. Hereinafter, the range of movement of such rollers 2124, 2126 in the X direction is also referred to as the "predetermined stroke range." Note that by using such rollers 2124, 2126, the force required to move the head 212 can be reduced.

[0026] The two rollers 2124, 2126 are preferably disposed at the same position in the X direction, abut in the Z direction, and can transmit a force to each other in the Z direction. In this case, the reaction force from the parking gear 41 received via the parking pole 42 can be transmitted to the support member 216 via the rollers 2124, 2126.

[0027] Of the two rollers 2124, 2126, the upper roller 2124 abuts in the Z direction against the lower surface of the upper part of a support member 216 (a lower surface whose normal direction is the Z direction) which will be described later. Therefore, the upward displacement of the two rollers 2124, 2126 is restricted mainly by the support member 216 via the roller 2124. Note that the upper roller 2124 is able to roll on the lower surface while abutting against the lower surface of the upper part of the support member 216.

[0028] Of the two rollers 2124, 2126, the lower roller 2126 abuts against the upper side surface of the parking pole 42 in the Z direction and is capable of rolling on the upper side surface of the parking pole 42. The roller 2126 cooperates with the parking pole 42 to change the force acting on the parking pole 42 in the Z direction depending on the position of the head 212 including the two rollers 2124, 2126 in the X direction.

[0029] Specifically, when rollers 2124, 2126 reach the locked position together with head 212 (see FIG. 1), roller 2126 rotates parking pole 42 around rotation axis 420 due to the shape of the upper side surface of parking pole 42 (shape as viewed in the Y direction). Note that parking pole 42 is biased around rotation axis 420 by spring 422. Spring 422 biases parking pole 42 to rotate to the unlocked position.

[0030] When rollers 2124 and 2126 reach the unlocked position together with head 212 (see Figure 2), due to the shape of the upper side surface of parking pole 42 (shape when viewed in the Y direction), roller 2126 rotates to the unlocked position (position away from parking gear 41) against the force of spring 422.

[0031] As will be described later, the auxiliary roller 2128 has a function (hereinafter also referred to as "posture change suppression function") of suppressing tilting of the posture of the head 212. Details of the posture change suppression function will be described later.

[0032] In this embodiment, the auxiliary roller 2128 is disposed on the X1 side in the X direction relative to the two rollers 2124 and 2126. However, in a modified example, the auxiliary roller 2128 may be disposed on the X2 side in the X direction relative to the two rollers 2124 and 2126.

[0033] Furthermore, in this embodiment, the auxiliary roller 2128, like the roller 2124, is disposed above the center of the head 212 in the Z direction. As shown in FIG. 3, the auxiliary roller 2128 is basically separated from the support member 216 in the Z direction (except during a posture change, which will be described later). In other words, the auxiliary roller 2128 does not basically roll on the support member 216. In this case, there is no load transmission to the support member 216 via the auxiliary roller 2128 (for example, load transmission during ratcheting), which reduces the need to increase the strength of the auxiliary roller 2128 and allows for size reduction.

[0034] The spring 214 biases the head 212 toward the X1 side in the X direction. The spring 214 is in the form of a coil spring. An end 21411 of the spring 214 on the X1 side in the X direction is supported by the head 212, and an end 21412 on the X2 side in the X direction is supported by the support member 216. The biasing force of the spring 214 may be adapted so that the locked state of the parking gear 41 can be maintained under appropriate conditions. For example, the biasing force of the spring 214 is adapted so that unintended release (transition of the parking gear 41 from the locked state to the unlocked state) does not occur due to input from external disturbances or the like.

[0035] The support member 216 is fixed to a structure on the vehicle body side (not shown, for example, a power transmission device). The support member 216 supports the head 212 in a manner that allows the head 212 to move linearly in the X direction. The support member 216 may have guide holes 2142 that support the rotating shafts 80, 81 and allow the rollers 2124, 2126 to move within a predetermined stroke range. For example, the support member 216 may be a bracket that supports both Y-direction ends of the rotating shafts 80, 81, and may be in the form of a bracket having a side surface (a side surface whose normal direction is the Y direction) with the guide holes 2142. The rotating shafts 80, 81 may be supported within the guide holes 2142 in a manner that allows a play (gap) in the Z direction relative to the guide holes 2142.

[0036] In this embodiment, the boundary position on the X1 side in the X-direction of the predetermined stroke range of the rollers 2124, 2126 corresponds to the position where the rollers 2124, 2126 are stopped from moving in the X1 direction by the guide hole 2142. In other words, the guide hole 2142 forms the boundary position on the X1 side in the X-direction of the predetermined stroke range of the rollers 2124, 2126. However, in a modified example, another stopper structure may be provided on the support member 216. The boundary position on the X2 side in the X-direction of the predetermined stroke range of the rollers 2124, 2126 may also be similar.

[0037] The support member 216 supports the spring 214. Specifically, the support member 216 has a seat 2160 on the X2 side in the X direction. The seat 2160 supports an end 21412 on the X2 side in the X direction of the spring 214, whose coil axis is in the X direction. In this case, an end 21411 on the X1 side in the X direction of the spring 214 abuts against the seat 2120 of the head 212 from the X2 side in the X direction. The spring 214 expands and contracts in the X direction between the seat 2120 of the head 212 and the seat 2160 of the support member 216, thereby changing the above-mentioned biasing force.

[0038] Next, the posture change suppression function of the auxiliary roller 2128 will be described with reference to Figures 4 and 5. In the following description, the posture of the head 212 means the posture of the head 212 with respect to the support member 216. Note that the normal posture of the head 212 with respect to the support member 216 is a posture in which the head 212 is parallel to the X direction, and will hereinafter also be referred to as the "nominal posture."

[0039] Fig. 4 is a diagram showing a state in which the attitude of the head 212 relative to the support member 216 has changed from the nominal attitude, and corresponds to Fig. 1. Fig. 5 is an enlarged view of part Q5 in Fig. 4.

[0040] In this embodiment, the head 212 is basically supported relative to the support member 216 via two rollers 2124, 2126 and the rotating shafts 80, 81. Specifically, with regard to displacement of the head 212 in the Z direction relative to the support member 216, upward displacement is restricted when the rotating shaft 81 abuts against the upper edge of the guide hole 2142, and downward displacement is restricted when the rotating shaft 80 abuts against the lower edge of the guide hole 2142. Furthermore, upward displacement is restricted when the upper roller 2124 abuts against the lower surface of the upper part of the support member 216, and downward displacement is restricted when the lower roller 2126 abuts against the parking pole 42. As for displacement in the X direction, as described above, displacement within a predetermined stroke is permitted due to the relationship between the rotating shafts 80, 81 and the guide hole 2142.

[0041] In this embodiment, the support of the head 212 in the Z direction relative to the support member 216 is realized within a relatively narrow range in the X direction, so that the posture of the head 212 relative to the support member 216 is easily changed when viewed in a direction parallel to the rotation axes 80 and 81.

[0042] In this embodiment, the auxiliary roller 2128 has a function (posture change suppression function) of suppressing a change in the posture of the head 212 relative to the support member 216. Specifically, when the posture of the head 212 relative to the support member 216 changes from the nominal posture, the auxiliary roller 2128 comes into contact with the upper part of the support member 216, thereby preventing any further posture change.

[0043] That is, when viewed in the axial direction of the rotation shaft 80, the auxiliary roller 2128 changes state between a first state (see Figure 5) in which it abuts against the support member 216 and a second state (see Figure 3) in which it is separated from the support member 216, depending on the attitude of the head 212 relative to the support member 216.

[0044] For example, in the locked state shown in FIG. 4, a rotational moment M1 may act on the head 212 due to a change in the reaction force from the parking pole 42, etc. In this case, the rotational moment M1 causes the head 212 to change its posture by rotating counterclockwise in the view of FIG. 4. At this time, the auxiliary roller 2128 enters the first state, preventing further rotation of the head 212. That is, as shown in FIG. 5, the auxiliary roller 2128 abuts on the upper part of the support member 216, and a rotational moment M2 that cancels out the rotational moment M1 is generated based on the reaction force F2. This prevents further rotation (posture change) of the head 212.

[0045] 4, when the head 212 moves toward the unlocked state, the auxiliary roller 2128 rotates (rolls) on the support member 216 together with the upper roller 2124. Therefore, according to this embodiment, even if the posture of the head 212 changes from the nominal posture, the auxiliary roller 2128 functions to prevent further changes in the posture of the head 212 and an increase in resistance (sliding resistance against the support member 216) when the head 212 moves.

[0046] In this way, according to this embodiment, the head 212 is supported by the support member 216 via the rollers 2124 and 2126, and an increase in sliding resistance due to a change in the position of the head 212 can be prevented.

[0047] Next, the effects of this embodiment will be further described in comparison with a comparative example with reference to FIGS.

[0048] 6 and 7 are schematic diagrams of a parking lock device 1' according to a comparative example, and are partial cross-sectional views corresponding to FIGS. 1 and 2 showing this embodiment. Like FIG. 1, FIG. 6 shows the locked state, and like FIG. 2, FIG. 7 shows the unlocked state. FIG. 8 is an explanatory diagram showing a state in which the attitude of the parking rod 212' has changed in the locked state. Note that the spring 214 is omitted from FIG. 8 for ease of viewing.

[0049] The parking lock device 1' according to the comparative example differs from the parking lock device 1 of this embodiment in that the head 212 is replaced with a parking rod 212' and the support member 216 is replaced with a support member 216'.

[0050] The parking rod 212' differs from the head 212 of this embodiment in that it does not have the auxiliary roller 2128, but has a rod portion 2129'. In the comparative example, an end 2125' of the parking rod 212' on the X2 side in the X direction is formed by the rod portion 2129'.

[0051] The rod portion 2129' has a relatively long dimension in the X direction, unlike the seat portion 2120 of the head 212 of this embodiment.

[0052] Specifically, the head 212 is not inserted into a hollow portion 2165 (a hollow portion that can be formed in the support member 216 and that supports the head 212) of a comparative example described below. In other words, the seat portion 2120 of the head 212 of this embodiment, including the stopper portion 2122, does not extend further toward the X2 side in the X-direction than the spring 214. That is, in this embodiment, in both the locked state ( FIG. 1 ) and the unlocked state ( FIG. 2 ) of the parking gear 41, the end portion 2125 of the head 212 on the X2 side in the X-direction is closer to the end portion 21411 of the spring 214 on the X1 side in the X-direction than the end portion 21412 of the spring 214 on the X2 side in the X-direction.

[0053] On the other hand, the rod portion 2129' of the comparative example extends further toward the X2 side in the X-direction than the spring 214. That is, in the comparative example, the end portion 2125' of the parking rod 212' on the X2 side in the X-direction is closer to the end portion 21412 of the spring 214 on the X2 side in the X-direction than the end portion 21411 of the spring 214 on the X1 side in the X-direction, whether the parking gear 41 is in the locked state (FIG. 6) or the unlocked state (FIG. 7).

[0054] The support member 216' differs from the support member 216 of this embodiment in that the protrusion 2164 is replaced with a protrusion 2164'. Unlike the protrusion 2164 of this embodiment, the protrusion 2164' has a hollow portion 2165, through which the rod portion 2129' can pass.

[0055] In this comparative example, as shown in Fig. 7, when the attitude of the parking rod 212' changes, the rod portion 2129' comes into contact with the hollow wall surface (the inner peripheral surface of the hollow portion 2165) of the protruding portion 2164' (see P8 in Fig. 8), thereby preventing further attitude change (i.e., realizing an attitude change suppression function). However, in the state in which the rod portion 2129' comes into contact with the hollow wall surface of the protruding portion 2164', when the parking rod 212' is moved toward the X2 side in the X direction, the rod portion 2129' moves on the hollow wall surface, increasing sliding resistance.

[0056] In contrast to this, in this embodiment, the auxiliary roller 2128 functions as described above, making it possible to prevent such an increase in sliding resistance.

[0057] Furthermore, in the comparative example, since the rod portion 2129' is provided with the posture change suppression function described above, the size of the parking lock device 1' as a whole in the X direction increases, and the required mounting space also increases. Specifically, as shown in Fig. 7, when the rod portion 2129' is positioned furthest toward the X2 side in the X direction, the size of the parking lock device 1' as a whole in the X direction increases. Because the rod portion 2129' is a movable member, the clearance that must be secured between the rod portion 2129' and surrounding components also increases, resulting in a problem of an increase in the required mounting space (mounting space required for the parking lock device 1' as a whole).

[0058] In contrast, according to the present embodiment, the auxiliary roller 2128 is provided with a posture change suppression function as described above, thereby reducing or eliminating the problems encountered in the comparative example. That is, according to the present embodiment, the head 212 does not have a portion corresponding to the rod portion 2129′, and the seat portion 2120 (stopper portion 2122) is always positioned closer to the X1 side in the X direction than the end portion 21412 of the spring 214 on the X2 side in the X direction. Therefore, according to the present embodiment, the position of the X2-side end of the parking lock device 1 in the X direction can be determined based on the X2-side end of the spring 214 in the X direction, thereby reducing the overall size of the parking lock device 1 in the X direction. Furthermore, according to the present embodiment, the head 212 is not exposed from the X2-side of the support member 216 in the X direction, so the installation space for the parking lock device 1 can be determined based on the X2-side end of the support member 216 in the X direction. As a result, unlike the comparative example described above, the installation space required for the parking lock device 1 as a whole can be reduced.

[0059] Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments.

[0060] For example, in the above-described embodiment, the auxiliary roller 2128 is provided on the X1 side of the rollers 2124 and 2126 in the X direction, but this is not limiting. For example, as in the head 212A according to a modified example shown in Fig. 9, the auxiliary roller 2128A may be provided on the X2 side of the rollers 2124 and 2126 in the X direction. Furthermore, the auxiliary roller 2128A may be provided together with the auxiliary roller 2128. In other words, two or more auxiliary rollers may be provided.

[0061] Furthermore, in the above-described embodiment, the auxiliary roller 2128 is configured not to come into contact with the support member 216 in the nominal position (i.e., configured to have backlash), but this is not limiting. That is, the auxiliary roller 2128 may come into contact with the support member 216 even in the nominal position, similar to the roller 2124. In this case, although the sliding resistance may increase slightly as the auxiliary roller 2128 functions in the nominal position, slight positional changes from the nominal position (for example, positional changes due to slight backlash) can be suppressed.

[0062] Furthermore, in the above-described embodiment, the rollers 2124 and 2126 are arranged at the same position in the X direction, but this is not limiting. For example, as in the head 212B according to a modified example shown in Fig. 10, the rollers 2124B and 2126B may be arranged at different positions in the X direction together with the auxiliary roller 2128B. In this case, the roller 2124B and the auxiliary roller 2128B may come into contact with the roller 2126B, thereby enabling the load transmission described above, that is, the load transmission to the support member 216 via the roller 2124B and the auxiliary roller 2128B (for example, the load transmission during ratcheting).

[0063] Furthermore, in the above-described embodiment, the auxiliary roller 2128 is provided above the head 212, but instead of or in addition to this, an auxiliary roller (not shown) may be used that is provided below the support member 216. In this case, the auxiliary roller can achieve a similar posture change suppression function by hitting the parking pole 42 when the posture of the movable member (not shown) changes from the nominal posture.

[0064] In addition, in the above-described embodiment, in the locked state, the head 212 is held in the locked position by the coil spring 214, but the opposite is also possible. That is, in the unlocked state, the head may be held in the unlocked position (unlocked position in the X direction) by a similar coil spring. [Explanation of symbols]

[0065] 1···Parking lock device, 10···Electric motor, 41···Parking gear, 42···Parking pole (locking member), 21···Lock mechanism (mechanism), 210···Linear motion mechanism, 212, 212A, 212B···Head (movable member), 2124···Roller (first roller), 2126···Roller (second roller), 2128, 2128A, 2128B···Auxiliary roller (third roller), 214···Spring, 21411···End (first coil end of spring), 21412···End (second coil end of spring), 216···Support member

Claims

1. An electric motor; a mechanism including a locking member that is releasably engaged with the parking gear, and the locking member is moved based on the output of the electric motor to switch the state of the parking gear between a locked state and an unlocked state; The mechanism comprises: a linear motion mechanism that converts the rotational output of the electric motor into linear motion in a first direction; a movable member that moves linearly in the first direction to move the locking member based on an input in the first direction received from the linear motion mechanism; a support member that supports the movable member in a manner that allows the movable member to move in the first direction; a spring that biases the movable member in the first direction so that the locked state is maintained, The movable member is a first roller that is movable while rotating on the locking member and applies a force to the locking member in a second direction that intersects with the first direction; a second roller that is movable while rotating on the support member and applies a force in the second direction to the support member; a third roller that can come into contact with the support member or the lock member.

2. 2. The parking lock device according to claim 1, wherein the third roller changes its state between a first state in which it abuts against the support member and a second state in which it is separated from the support member, depending on the attitude of the movable member with respect to the support member when viewed in a third direction perpendicular to both the first direction and the second direction.

3. 3. The parking lock device according to claim 2, wherein when the attitude of the movable member changes due to a rotational moment being applied around an axis in the third direction, the movable member is subjected to a rotational moment that cancels out the rotational moment due to a force in the second direction that is applied from the support member to the third roller in the first state.

4. 4. The parking lock device according to claim 1, wherein the movable member is not inserted into a hollow portion that may be formed in the support member and that supports the movable member.

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