Park Device

Abstract

To secure driving torque.SOLUTION: In a park device 1, a cam plate 29 rotated by an actuator 4 has a first cam groove 291 including a radius change groove 291a, a first pin 28 is engaged with the first cam groove 291, and a first rod 27 is connected to the first pin 28 and engaged with a manual plate 26. The radius change groove 291a has a radius that gradually increases as an angular position on the cam plate 29 moves toward a park lock release side, and further includes: a first cam wall W1 that guides the first pin 28 when shifting from a park lock position to a park lock release position; and a second cam wall W2 that guides the first pin 28 when shifting from the park lock release position to the park lock position. The first cam wall W1 and the second cam wall W2 have change shapes that change the groove width of the radius change groove 291a.SELECTED DRAWING: Figure 7

Description

[Technical field]

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

[0002] Patent Document 1 discloses a technology for locking and unlocking a parking pole by rotating the parking pole via a driven gear or the like using a motor. The torque of the motor is transmitted to the parking pole via a ball-shaped pivot fixed to a mounting bracket integrally formed with the driven gear. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-315410 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the torque of the motor is transmitted to the parking pole as described above, the ratio of the torque of the motor to the torque of the parking pole is constant. Therefore, in this case, a large motor needs to be installed assuming that a large load is applied to the parking pole when the parking lock is released, which may result in poor vehicle mountability.

[0005] By continuously changing the torque ratio between the park lock position and the park lock release position, it is possible to obtain a driving torque that is larger on the park lock position side and smaller on the park lock release position side. This makes it possible to obtain a driving torque that exceeds the maximum load without making the motor larger, which contributes to improving vehicle mountability. To continuously change the torque ratio, the parking device can be configured as follows. That is, the parking device can be configured such that a cam plate that is rotated by a motor has a cam groove including a radius-changing groove, a pin engages with the cam groove, and a rod is connected to the pin and engages with a rotating plate for which a torque ratio is set. The radius-changing groove serves to continuously change the torque ratio.

[0006] However, when moving from the park lock position to the park lock released position, the axial torque of the rotating plate is greater than when moving from the park lock position to the park lock released position because the park lock needs to be released. Therefore, even if the radius changing groove can obtain the driving torque required in the former case, there is a risk that a sufficient margin cannot be obtained. Even if the driving torque required in the former case can be secured, the radius changing groove continuously changes the torque ratio, so that there is a risk that a sufficient margin cannot be obtained for the driving torque required in the latter case.

[0007] The sliding resistance generated by the pin moving in the cam groove during rod operation causes torque loss, so suppressing this sliding resistance also contributes to ensuring drive torque.

[0008] The present invention has been made in view of the above problems, and has an object to ensure driving torque. [Means for solving the problem]

[0009] In the parking device according to the first aspect of the present invention, the actuator rotates the parking device. Rotational Actuation plate Or, a rotating plate with a set torque ratio that transmits the torque of the actuator to the parking pole. The cam groove includes a radius-changing groove, and a pin is engaged with the cam groove. Also, As the rod connects to the pin A rotating plate without a cam groove or Engage with rotating plate and from the rotating plate Rotating plate Transmits the actuator torque to The radius change groove is Rotational operation with cam groove plate Or rotating plate The radius gradually increases as the upper angle position approaches the park lock release side, and the pin has a first cam wall that guides the pin when transitioning from the park lock position to the park lock release position, and a second cam wall that guides the pin when transitioning from the park lock release position to the park lock position. The first cam wall and the second cam wall have shapes that change the groove width of the radius changing groove.

[0010] In the parking device according to the second aspect of the present invention, the actuator rotates the parking device. Rotational Actuation plate Or, a rotating plate with a set torque ratio that transmits the torque of the actuator to the parking pole. The cam groove includes a radius-changing groove, and a pin is engaged with the cam groove. Also, As the rod connects to the pin A rotating plate without a cam groove or Engage with rotating plate and from the rotating plate Rotating plate Transmits the actuator torque to The rod has one end connected to the pin and A rotating plate without a cam groove or The cam groove has an other end that engages with the rotation plate and an extension that connects the one end and the other end. The cam groove and the extension overlap in a depth direction of the cam groove. Effect of the Invention

[0011] According to the parking device of the first aspect, the groove width of the radius-changing groove is not kept constant but is changed, so that the torque ratio can be changed from the case where the groove width is constant. Therefore, when transitioning from the park lock position to the park lock release position, not only is the necessary drive torque obtained by the first cam wall possible, but also a sufficient margin for the necessary drive torque can be obtained. In addition, since the first cam wall and the second cam wall are used differently depending on whether transitioning from the park lock position to the park lock release position or vice versa, a sufficient margin for the necessary drive torque can be obtained even in the latter case.

[0012] According to the parking device of the second aspect, the extension of the rod is prevented from being offset in the depth direction of the cam groove relative to the cam groove. This prevents the occurrence of a torsional moment in the rod due to the load applied to the pin from the cam wall of the cam groove when the rod is actuated. As a result, the sliding resistance generated in the pin moving in the cam groove is reduced, which reduces torque loss and contributes to ensuring drive torque. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a schematic diagram of a parking device. [Diagram 2] FIG. 4 is an explanatory diagram of a first cam groove. [Diagram 3] FIG. 4 is an explanatory diagram of a second cam groove. [Figure 4] FIG. 1 is a first explanatory diagram of the operation of the parking device. [Diagram 5] FIG. 2 is a second explanatory diagram of the operation of the parking device. [Figure 6] FIG. 3 is a third explanatory diagram of the operation of the parking device. [Figure 7] FIG. 4 is an enlarged view of a radius-changing groove. [Figure 8] FIG. 11 is an explanatory diagram of a torque ratio in a manual plate. [Figure 9] 4 is a cross-sectional view of the reduction gear and the cam plate and its surrounding area. FIG. [Figure 10] FIG. 13 is a cross-sectional view of a comparative example. [Figure 11] FIG. 13 is a diagram showing a modified example of the parking device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0015] Fig. 1 is a schematic diagram of a parking device 1. The parking device 1 has a parking mechanism 2, a shift mechanism 3, an actuator 4, a reduction gear 5, a first gear 6, and a second gear 7. In Fig. 1, the parking mechanism 2 is shown in a front view of a cam plate 29, and the shift mechanism 3, the actuator 4, and the reduction gear 5 are shown in a side view of the cam plate 29.

[0016] The parking mechanism 2 has a parking gear 21, a parking pole 22, a parking rod 23, a wedge 24, a wedge spring 25, a manual plate 26, a first rod 27, a first pin 28, a cam plate 29, a detent spring 80, and an engagement member 81.

[0017] The parking gear 21 is fixed to the output shaft of the transmission, and rotates and stops together with the output shaft. A parking pole 22 is engaged with the parking gear 21.

[0018] The parking pole 22 swings in response to the movement of the parking rod 23. When the parking pole 22 swings, the engagement state between the parking gear 21 and the parking pole 22 changes.

[0019] The parking rod 23 is provided between the parking pole 22 and the manual plate 26. A wedge 24 is provided on one end of the parking rod 23, and the manual plate 26 engages with the other end of the parking rod 23.

[0020] The wedge 24 is an abutting member that comes into contact with the parking pole 22, and is provided so as to be displaceable in the axial direction of the parking rod 23. The wedge 24 swings the parking pole 22 in response to the movement of the parking rod 23.

[0021] The wedge spring 25 is provided between the flange 23a of the parking rod 23 and the wedge 24, and biases the wedge 24 toward the parking pole 22. The wedge spring 25 is a coil spring, and is disposed on the parking rod 23 with the parking rod 23 inserted therethrough. The contact state between the wedge 24 and the parking pole 22 is maintained by a sleeve located on the opposite side of the parking pole 22 with the wedge 24 in between.

[0022] The manual plate 26 is a rotating plate and has a park rod engagement hole 26a and a first rod engagement hole 26b. The park rod 23 engages with the park rod engagement hole 26a with some play. The manual plate 26 has a first groove portion 26c and a second groove portion 26d on its periphery. A detent spring 80 engages with the first groove portion 26c and the second groove portion 26d.

[0023] The first rod 27 is connected to the first pin 28 and engages with the manual plate 26. One end 27a of the first rod 27 is connected to the first pin 28 and the other end 27b engages with the first rod engagement hole 26b. The first rod 27 extends straight with an extension portion 27c, and the one end 27a and the other end 27b are connected to the extension portion 27c.

[0024] The first pin 28 engages with a first cam groove 291 of the cam plate 29. The first pin 28 moves within the first cam groove 291 in response to the rotation of the cam plate 29.

[0025] Cam plate 29 is a disk-shaped plate and has a first cam groove 291. Cam plate 29 is connected to reduction gear 5 via shaft 51 and is disposed coaxially with reduction gear 5. In cam plate 29, power from actuator 4 is transmitted to first pin 28 via first cam groove 291.

[0026] The detent spring 80 is formed of a leaf spring and biases the engagement member 81 toward the manual plate 26. The engagement member 81 engages with the first groove portion 26c and the second groove portion 26d. In this embodiment, the engagement member 81 is formed at the tip portion of the detent spring 80, and engages with the first groove portion 26c when the park mechanism 2 is in the park lock position, and engages with the second groove portion 26d when the park mechanism 2 is in the park lock release position. The park lock release position is set to have a certain width. Therefore, the second groove portion 26d has an engagement area having a certain width corresponding to the park lock release position.

[0027] The park lock position is a first switching position of the park mechanism 2, and in the park lock position, the parking pole 22 meshes and engages with the parking gear 21. The park lock release position is a second switching position of the park mechanism 2, and in the park lock release position, the parking pole 22 moves to the park lock release side to the maximum extent and does not mesh and engage with the parking gear 21. The detent spring 80 holds the rotational position of the manual plate 26 by its spring force with the engagement member 81 engaged with the first groove portion 26c and the second groove portion 26d, respectively.

[0028] The reduction gear 5 is connected to the actuator 4. The reduction gear 5 meshes with a first gear 6 provided on an output shaft of the actuator 4, and is connected to the actuator 4 via the first gear 6.

[0029] The actuator 4 is, for example, a motor, and the power of the actuator 4 is transmitted to the parking pole 22 via the first gear 6, the reduction gear 5, the cam plate 29, the first pin 28, the first rod 27, the manual plate 26, the parking rod 23, the wedge spring 25, and the wedge 24. As a result, the parking pole 22 is operated by the actuator 4.

[0030] The reduction gear 5 is further connected to the shift mechanism 3. The shift mechanism 3 is a mechanism for engaging and releasing a clutch, and a dog clutch is used as the clutch. A clutch other than a dog clutch may also be used as the clutch. The shift mechanism 3 has a cam cylinder 31, a second pin 32, and a second rod 33.

[0031] The cam cylinder 31 is used to convert the rotational motion of the actuator 4 into linear motion. The cam cylinder 31 is used to operate the shift fork of the dog clutch, and is connected to the reduction gear 5 via a second gear 7 provided on the rotary shaft of the cam cylinder 31. The cam cylinder 31 has a second cam groove 311, and a second pin 32 engages with the second cam groove 311.

[0032] The second pin 32 moves in the second cam groove 311 in response to the rotation of the cam cylinder 31. Power from the actuator 4 is transmitted to the second pin 32 from the cam cylinder 31 via the second cam groove 311. One end of a second rod 33 is connected to the second pin 32, and the other end of the second rod 33 is connected to the shift fork via a spring. One end of the second rod 33 is fixed to the second pin 32.

[0033] Next, the first cam groove 291 and the second cam groove 311 will be described.

[0034] 2 is an explanatory diagram of the first cam groove 291. The first cam groove 291 is provided on the plate surface of the cam plate 29, and has a radius-changing groove 291a and a constant radius groove 291b. The radius-changing groove 291a is set so that its radius changes.

[0035] The radius changing groove 291a has a first position P1 and a second position P2. The first pin 28 is located at the first position P1 when the parking mechanism 2 is in the park lock position, and the first pin 28 is located at the second position P2 when the parking mechanism 2 is in the park lock release position. The first pin 28 is located at the first position P1 just before one end of the radius changing groove 291a on the park lock side.

[0036] The radius of radius changing groove 291a gradually increases as the angular position on cam plate 29 moves toward the park lock release side. Note that the illustrated park lock side and park lock release side indicate the positions of radius changing groove 291a on cam plate 29, and the rotation direction of cam plate 29 when park lock is engaged and when park lock is released is opposite to the illustrated park lock side and park lock release side.

[0037] The second position P2 is located just before the other end of the radius change groove 291a on the park lock release side. The radius of the radius change groove 291a is maximum at the connecting position of the radius change groove 291a and the constant radius groove 291b. The radius of the radius change groove 291a gradually increases as the angular position on the cam plate 29 moves toward the park lock release side, from the angular position of the first position P1 where the first pin 28 is located at the park lock position to the angular position of the second position P2 where the first pin 28 is located at the park lock release position, and further to the connecting position of the radius change groove 291a and the constant radius groove 291b. The other end of the radius change groove 291a on the park lock release side is continuous with the constant radius groove 291b.

[0038] The constant radius groove 291b has a constant radius. The constant radius groove 291b extends from the radius changing groove 291a toward the clutch engagement side, which is the same direction as the park lock release side. The opposite direction of the constant radius groove 291b from the clutch engagement side is the clutch release side. Note that the illustrated clutch engagement side and clutch release side indicate the position of the constant radius groove 291b on the cam plate 29, just like the illustrated park lock side and park lock release side.

[0039] When first pin 28 is positioned in radius-changing groove 291a, as cam plate 29 rotates, radius-changing groove 291a interferes with first pin 28. Therefore, first pin 28 moves in response to the rotation of cam plate 29 while being guided by radius-changing groove 291a.

[0040] When first pin 28 is positioned in constant radius groove 291b, even if cam plate 29 rotates, constant radius groove 291b does not interfere with first pin 28, so first pin 28 does not move. In other words, constant radius groove 291b is an idling groove that causes first pin 28 to idly swing when cam plate 29 rotates. Constant radius groove 291b corresponds to the first idling groove.

[0041] 3 is an explanatory diagram of the second cam groove 311. The illustrated clutch engagement side and clutch release side indicate the position of the second cam groove 311 on the cam cylinder 31 in both the axial direction and rotational direction of the cam cylinder 31.

[0042] The second cam groove 311 is provided on the circumferential surface of the cam cylinder 31, and has an axial position constant groove 311a and an axial position variable groove 311b. The axial position constant groove 311a keeps the axial position in the cam cylinder 31 constant. The axial position constant groove 311a is an idle groove that causes the second pin 32 to idle when the cam cylinder 31 rotates, and when the second pin 32 is positioned in the axial position constant groove 311a, the axial position constant groove 311a does not interfere with the second pin 32 even if the cam cylinder 31 rotates. The axial position constant groove 311a corresponds to the second idle groove.

[0043] In the axial position changing groove 311b, the axial position changes on the cam cylinder 31. In the axial position changing groove 311b, the axial position gradually changes to the clutch engagement side as the angular position on the cam cylinder 31 moves toward the clutch engagement side. The axial position changing groove 311b is connected to one end of the axial position constant groove 311a on the rotational direction clutch engagement side on the cam cylinder 31.

[0044] The axial position constant groove 311a is provided in relation to the radius changing groove 291a of the cam plate 29 as follows. That is, the radius changing groove 291a and the axial position constant groove 311a are provided such that when the second pin 32 is positioned in the axial position constant groove 311a, the first pin 28 is positioned in the radius changing groove 291a (see FIG. 1). Therefore, the park mechanism 2 that operates in response to the operation of the first pin 28 operates when the shift mechanism 3 that operates in response to the operation of the second pin 32 is not operating.

[0045] The axial position change groove 311b is provided in relation to the constant radius groove 291b of the cam plate 29 as follows. That is, the constant radius groove 291b and the axial position change groove 311b are provided such that when the first pin 28 is located in the constant radius groove 291b, the second pin 32 is located in the axial position change groove 311b (see FIG. 6 described later). Therefore, the shift mechanism 3 that operates in response to the operation of the second pin 32 operates when the park mechanism 2 that operates in response to the operation of the first pin 28 is not operating.

[0046] In Fig. 1, the parking mechanism 2 is in the park lock position, and the shift mechanism 3 is in a non-operating state. In the park lock position, the parking pole 22 meshes with and engages with the parking gear 21, so that the parking gear 21 is mechanically locked and the movement of the vehicle is restricted. When the actuator 4 is driven in the direction to release the parking lock from this state, the parking device 1 operates as follows.

[0047] Figures 4 to 6 are explanatory diagrams of the operation of the parking device 1. Figure 4 shows a case where the parking mechanism 2 is in an intermediate position between the park lock position and the park lock release position, and the shift mechanism 3 is in an inoperative state. Figure 5 shows a case where the parking mechanism 2 is in the park lock release position, and the shift mechanism 3 is in an inoperative state. Figure 6 shows a case where the parking mechanism 2 is in the park lock release position, and the shift mechanism 3 is in an operational state.

[0048] In Fig. 4, the actuator 4 is driven in the park lock release direction, causing the cam plate 29 to rotate in the park lock release direction. As a result, the first pin 28 is guided by the radius changing groove 291a and moves to the park lock release side of the cam plate 29.

[0049] At this time, the first rod 27 moves in the park lock release direction, which is to the left in the figure, and pushes the manual plate 26. As a result, the manual plate 26 rotates in the park lock release direction, which is counterclockwise in the figure, and pulls the park rod 23.

[0050] This causes the wedge 24 to move together with the parking rod 23 in a direction away from the parking pole 22. As a result, the parking pole 22 moves in a direction away from the parking gear 21, that is, toward the parking lock release side, while abutting against the tapered portion of the wedge 24.

[0051] When the first pin 28 is positioned in the radius-changing groove 291a, the actuator 4 thus operates the parking pole 22 to the park lock release side, whereby the parking mechanism 2 is actuated.

[0052] In the shift mechanism 3, the second pin 32 is positioned in the aforementioned axial position fixing groove 311a. Therefore, even if the actuator 4 drives in the park lock release direction, the second pin 32 is not guided by the second cam groove 311. Therefore, the second pin 32 and the second rod 33 do not move, and the shift mechanism 3 is inoperative.

[0053] 4, although the meshing and fastening between the parking gear 21 and the parking pole 22 is released, the first pin 28 has not reached the second position P2 described above. Therefore, the switching position of the parking mechanism 2 is not the park lock release position but an intermediate position.

[0054] In Fig. 5, the first pin 28 has moved to the second position P2 in response to the rotation of the cam plate 29. As a result, the switching position of the parking mechanism 2 becomes the park lock release position, and the vehicle becomes movable. The wedge 24 has moved in a direction further away from the parking pole 22 than in the state shown in Fig. 4. Since the second pin 32 is still positioned in the aforementioned axial position fixing groove 311a, the shift mechanism 3 remains inoperative. The engagement member 81 is engaged with the second groove portion 26d on the right side in the figure.

[0055] In Fig. 6, the actuator 4 is further driven in the clutch engagement direction, which is the same direction as the park lock release direction, and the cam plate 29 rotates in response, so that the first pin 28 is positioned in the constant radius groove 291b described above. Therefore, even if the cam plate 29 rotates, the first pin 28 does not move, and the parking pawl 22 does not operate, so the parking mechanism 2 is inoperative. The engagement member 81 is engaged with the second groove portion 26d on the left side in the figure, and the parking pawl 22 has moved to the maximum extent toward the park lock release side.

[0056] In the shift mechanism 3, the second pin 32 is positioned in the axial position change groove 311b described above. Therefore, when the cam cylinder 31 rotates in the clutch engagement direction, which is the same direction as the park lock release direction, by the power from the actuator 4, the second pin 32 is guided by the axial position change groove 311b and moves to the axial engagement side of the cam cylinder 31.

[0057] As a result, the second rod 33 also moves in the clutch engagement direction, and power is transmitted from the second rod 33 to the shift fork via the spring. As a result, the shift fork moves due to the power from the actuator 4, or the spring is compressed to move the shift fork, and the shift mechanism 3 enters an actuated state.

[0058] FIG. 7 is an enlarged view of the radius change groove 291a. The dashed lines indicate the cam walls when the groove width of the radius change groove 291a is constant. The radius change groove 291a has a first cam wall W1 and a second cam wall W2. The first cam wall W1 guides the first pin 28 when moving from the park lock position to the park lock release position. The second cam wall W2 guides the first pin 28 when moving from the park lock release position to the park lock position. The reference center line L is a center line that serves as a reference for each of the cam walls shown by the dashed lines, that is, each of the cam walls when the groove width of the radius change groove 291a is constant. Therefore, when viewed along a direction perpendicular to the cam plate 29, the distance to one cam wall shown by the dashed lines and the distance to the other cam wall shown by the dashed lines are equal on a line perpendicular to the reference center line L. The groove width of the cam wall indicated by the broken line is equal to the diameter of the first pin 28 plus a preset clearance, and is equal to the groove width WTH1 of the constant radius groove 291b.

[0059] The first cam wall W1 and the second cam wall W2 have a change shape that changes the groove width WTH of the radius change groove 291a. In other words, this change shape is a change shape in which the distance from the reference center line L of the radius change groove 291a changes along the extension direction of the radius change groove 291a for each of the first cam wall W1 and the second cam wall W2. In the change shape, the groove width WTH is set larger than the groove width of the cam wall shown by the broken line, that is, the groove width WTH1 of the constant radius groove 291b, in order to ensure the mobility of the first pin 28. In the change shape, the first cam wall W1 and the second cam wall W2 each gradually increase the groove width WTH in a direction from one end side to the other end side (for example, from the parking lock side to the parking lock release side) relative to the other, and then gradually decrease the groove width WTH as the increase reverses. The first position P1 and the second position P2 are located within a range (within the range of the two-dot dashed line) in which the change shape is provided in the extension direction of the radius change groove 291a. The second position P2 is the position closest to the park lock position with respect to the park lock release position, which has a certain width. In the first cam wall W1, the varying shape is provided over the entire extension direction of the radius changing groove 291a, and in the second cam wall W2, the varying shape is provided over a portion of the extension direction of the radius changing groove 291a. The first position P1 can be a position adjacent to the first cam wall W1, and the second position P2 can be a position adjacent to the second cam wall W2. The profiles of the first cam wall W1 and the second cam wall W2 are set based on the load torque TR and the load torque TL, which will be described later.

[0060] As a result of providing the first cam wall W1 and the second cam wall W2 in this manner, in the parking device 1, the torque ratio in the manual plate 26 changes as follows. The torque ratio in the manual plate 26 is the ratio of the torque transmitted by the manual plate 26 to the torque of the actuator 4, and corresponds to the torque ratio of the operating torque of the parking pawl 22 to the torque of the actuator 4.

[0061] FIG. 8 is an explanatory diagram of the torque ratio in the manual plate 26. The vertical axis indicates the axial torque of the manual plate 26, and the horizontal axis indicates the angular position of the manual plate 26. Driving torques T1, T2, and TX indicate the axial torque of the manual plate 26 according to the torque of the actuator 4. Driving torque T1 indicates the driving torque when moving from the park lock position to the park lock release position, that is, when the first pin 28 is guided by the first cam wall W1. Driving torque T2 indicates the driving torque in the opposite case, that is, when the first pin 28 is guided by the second cam wall W2. Driving torque TX indicates the driving torque in the comparative example. The comparative example indicates the driving torque when the groove width of the radius-changing groove 291a is constant.

[0062] The load torque TR indicates the shaft torque of the manual plate 26 according to the load when the parking lock is released, and the load torque TL indicates the shaft torque of the manual plate 26 according to the load when the parking lock is engaged. For example, when the vehicle is parked on a slope, a large load is applied to the parking pole 22 from the parking gear 21.

[0063] For this reason, when the angular position of the manual plate 26 changes from the angular position corresponding to the first position P1 toward the angular position corresponding to the second position P2, the load torque TR immediately rises sharply to the maximum load TR_MAX. The load torque TR reaches the maximum load TR_MAX when the engagement member 81 overcomes the slope of the first groove portion 26c against the spring force of the detent spring 80.

[0064] In the comparative example, since the groove width of the radius changing groove 291a is constant, when the cam plate 29 in the park lock position rotates toward the park lock release side, the first pin 28 is guided by the radius changing groove 291a and moves radially outward.

[0065] When the parking device 1 is activated, the torque of the actuator 4 is constant, and the torque transmitted from the actuator 4 to the cam plate 29 is constant. Therefore, due to the relationship of tangential load × radius = torque, the larger the radius of the radius-changing groove 291a in which the first pin 28 is located, the smaller the load transmitted from the first pin 28 to the manual plate 26 via the first rod 27 becomes.

[0066] Therefore, the driving torque TX transmitted by the manual plate 26 based on the torque of the actuator 4 gradually decreases as the angular position of the manual plate 26 changes from the angular position corresponding to the first position P1 toward the angular position corresponding to the second position P2. The driving torque TX changes in this manner from the angular position corresponding to the first position P1 to the angular position corresponding to the second position P2, and thereby changes in this manner from the park lock position to the park lock released position.

[0067] As a result, in the comparative example, a driving torque TX is obtained that is larger on the park lock position side and smaller on the park lock release position side. As a result, it is possible to obtain a driving torque TX that exceeds the maximum load TR_MAX.

[0068] Since the torque of the actuator 4 is constant when the parking device 1 is activated, the change in the driving torque TX indicates the change in the torque ratio in the manual plate 26. The driving torque TX changes continuously between the park lock position and the park lock release position by changing in accordance with the change in radius of the gradually changing radius-changing groove 291a.

[0069] Therefore, a torque ratio that changes continuously between the park lock position and the park lock released position is set in the manual plate 26. This allows the torque of the actuator 4 to be transmitted smoothly to the parking pole 22 even when the torque ratio is changed, and also prevents the generation of noise. A torque ratio that changes continuously from the park lock position to the park lock released position is set in the manual plate 26.

[0070] The torque ratio of the manual plate 26 is maximum near the angular position of the manual plate 26 where the maximum load TR_MAX occurs when the park lock is released. The vicinity of the angular position of the manual plate 26 where the maximum load TR_MAX occurs is near the angular position where the engagement member 81 climbs over the slope of the first groove portion 26c when the park lock is released, and is set to the angular position of the manual plate 26 according to the park lock position. This appropriately sets the torque characteristics of the drive torque TX to make the drive torque TX higher than the maximum load TR_MAX.

[0071] For this reason, in the comparative example, when the angular position of the manual plate 26 changes from the angular position corresponding to the first position P1 toward the angular position corresponding to the second position P2, a driving torque TX having characteristics suitable for the load torque TR which immediately rises sharply to the maximum load TR_MAX is obtained.

[0072] On the other hand, in the comparative example, the driving torque TX does not have a sufficient margin relative to the maximum load TR_MAX, which raises the concern that the necessary driving torque will not be ensured in the comparative example.

[0073] In this embodiment, the first cam wall W1 and the second cam wall W2 have a shape that changes the groove width WTH of the radius change groove 291a. Therefore, when the parking lock is released, the first cam wall W1 can guide the first pin 28 along a trajectory similar to that when the radius of the radius change groove 291a is made smaller than that in the comparative example. As a result, it is possible to obtain a driving torque T1 having torque characteristics that are larger on the park lock position side and smaller on the park lock release position side than the driving torque TX in the comparative example. Therefore, in the parking device 1, when moving from the park lock position to the park lock release position, not only can the first cam wall W1 obtain a driving torque T1 that is equal to or larger than the maximum load TR_MAX, but also a sufficient margin can be obtained for the maximum load TR_MAX. The reason why the driving torque T1 is smaller than the driving torque TX on the park lock release position side is that not only the load that the first pin 28 receives from the first cam wall W1, i.e., the magnitude of the tangential force based on the torque of the cam plate 29, changes due to the change in radius of the radius change groove 291a, but also the tangential direction of the tangential force changes depending on the position of the first pin 28.

[0074] On the other hand, although the drive torque T1 exceeds the maximum load TL_MAX of the load torque TL, it does not have a sufficient margin for the maximum load TL_MAX. The load torque TL becomes the maximum load TL_MAX when the engagement member 81 overcomes the slope of the second groove portion 26d against the spring force of the detent spring 80.

[0075] The parking device 1 uses the first cam wall W1 and the second cam wall W2 differently depending on whether it is a transition from the park lock position to the park lock release position or the reverse. When park lock is activated, the second cam wall W2 can guide the first pin 28 along a trajectory similar to that when the radius of the radius-changing groove 291a is made larger than in the comparative example. As a result, it is possible to obtain a driving torque T2 having torque characteristics that are smaller on the park lock release position side and larger on the park lock position side than the driving torque TX in the comparative example. Therefore, the parking device 1 can obtain a sufficient margin for the maximum load TL_MAX even when transitioning from the park lock release position to the park lock position.

[0076] The maximum load TR_MAX occurs when the engaging member 81 overcomes the slope of the first groove portion 26c when the parking lock is released, and the maximum load TL_MAX occurs when the engaging member 81 overcomes the slope of the second groove portion 26d. In contrast, in the parking device 1, the first cam wall W1 and the second cam wall W2 each gradually increase the groove width WTH relative to the other in a direction from one end side to the other end side, and then gradually decrease the groove width WTH as the groove width WTH changes from the increase. This appropriately provides a sufficient margin for the maximum load TR_MAX and maximum load TL_MAX that occur as described above.

[0077] FIG. 9 is a cross-sectional view of the reduction gear 5 and the cam plate 29. FIG. 9 shows a cross-section of a plane that includes the center line of the extension 27c and is parallel to the axial direction D. The axial direction D corresponds to the depth direction of the first cam groove 291. As shown in FIG. 9, the first cam groove 291 is provided penetrating the cam plate 29. That is, the first cam groove 291 is formed as a bottomless cam groove, and the cam groove may be bottomless, that is, formed as a through hole. One end 27a of the first rod 27 branches in the axial direction D from the connection with the extension 27c, and is formed in a U-shaped cross section. The cam plate 29 is disposed between the respective branched portions of the one end 27a. The one end 27a is connected to the first pin 28 via an intermediate pin 271. The first pin 28 has a cylindrical shape, and the intermediate pin 271 is provided penetrating the first pin 28. The intermediate pin 271 is fixed at both ends to the branched portions of the one end 27a while passing through the first pin 28. The one end 27a can be made of a plate-like member, and the first rod 27 can be formed by fixing the extension portion 27c to the one end 27a.

[0078] Fig. 10 is a cross-sectional view of a comparative example. Fig. 10 shows a cross-section similar to that of Fig. 9. In the comparative example, a cam plate 29X is provided instead of the cam plate 29, and a first rod 27X is provided instead of the first rod 27. The cam plate 29 has a bottomed first cam groove 291X that opens toward the first rod 27 in the axial direction D. The first rod 27X has one end 27aX that extends toward the cam plate 29 along the axial direction D from the connection portion with the extension portion 27cX. The one end 27aX is inserted into a first pin 28 provided in the first cam groove 291X.

[0079] In the comparative example configured in this manner, the extension 27cX of the first rod 27X is disposed offset in the axial direction D with respect to the first cam groove 291X. Therefore, the extension 27cX of the first rod 27X and the first cam groove 291X do not overlap in the axial direction D. In this case, a torsional moment is generated in the first rod 27X due to a load applied to the first pin 28 from the cam wall of the first cam groove 291X when the first rod 27X is actuated. As a result, the sliding resistance generated in the first pin 28 moving in the first cam groove 291X when the first rod 27X is actuated increases, causing a torque loss.

[0080] In this embodiment, as shown in Fig. 9, the extension 27c of the first rod 27 and the first cam groove 291 overlap in the axial direction D. This prevents the extension 27c from being offset in the axial direction D with respect to the first cam groove 291. This prevents a torsional moment from being generated in the first rod 27 when the first rod 27 is in operation, that is, when the first pin 28 is positioned in the radius-changing groove 291a, thereby suppressing the sliding resistance generated in the first pin 28. As a result, torque loss is suppressed, which contributes to ensuring drive torque.

[0081] In this embodiment, the center position D1 of the first cam groove 291 in the axial direction D overlaps with the position range R of the extension portion 27c in the axial direction D. Therefore, the offset of the extension portion 27c in the axial direction D from the center position D1 of the first cam groove 291 is limited as much as possible. As a result, torque loss is suppressed as much as possible. Furthermore, in this embodiment, the center position D1 of the first cam groove 291 in the axial direction D overlaps with the center position D2 of the extension portion 27c in the axial direction D. As a result, the extension portion 27c is not offset in the axial direction D from the first cam groove 291, thereby preventing torque loss caused by torsional moment.

[0082] Next, the main effects of this embodiment will be described.

[0083] The parking device 1 includes an actuator 4 that operates a parking pole 22, and engages the parking pole 22 with a parking gear 21 to perform parking lock. A torque ratio of the operating torque of the parking pole 22 to the torque of the actuator 4 changes continuously between a first switching position, which is a park lock position, and a second switching position, which is a park lock release position. The parking device 1 includes a manual plate 26 with a set torque ratio, a cam plate 29 that is rotated by the actuator 4 and has a first cam groove 291 including a radius change groove 291a, a first pin 28 that engages with the first cam groove 291, and a first rod 27 that is connected to the first pin 28 and engages with the manual plate 26. The radius change groove 291a has a radius that gradually increases as the angular position on the cam plate 29 approaches the park lock release side, and includes a first cam wall W1 that guides the first pin 28 when shifting from the park lock position to the park lock release position, and a second cam wall W2 that guides the first pin 28 when shifting from the park lock release position to the park lock position. The first cam wall W1 and the second cam wall W2 have a varying shape that changes the groove width of the radius-changing groove 291a.

[0084] According to this configuration, by changing the groove width WTH of the radius-changing groove 291a rather than keeping it constant, it is possible to change the torque ratio from when the groove width WTH is constant. Therefore, when transitioning from the park lock position to the park lock release position, not only is it possible to obtain a drive torque T1 equal to or greater than the maximum load TR_MAX by the first cam wall W1, but it is also possible to obtain a sufficient margin for the maximum load TR_MAX. In addition, because the first cam wall W1 and the second cam wall W2 are used differently when transitioning from the park lock position to the park lock release position and when transitioning vice versa, it is also possible to obtain a sufficient margin for the maximum load TL_MAX in the latter case.

[0085] In this embodiment, the first position P1 where the first pin 28 is located at the park lock position and the second position P2 where the first pin 28 is located at the park lock release position are located within a range where a varying shape is provided in the extension direction of the radius-changing groove 291a. The varying shape is such that the groove width WTH of each of the first cam wall W1 and the second cam wall W2 gradually increases in a direction from one end side to the other end side, and then gradually decreases as the groove width WTH changes from the increasing shape. With this configuration, a sufficient margin can be appropriately obtained for the maximum load TR_MAX and the maximum load TL_MAX that are generated when the engagement member 81 rides over the slope of the first groove portion 26c and the slope of the second groove portion 26d.

[0086] The parking device 1 includes an actuator 4 that operates a parking pole 22, and engages the parking pole 22 with a parking gear 21 to perform parking lock. A torque ratio of the operating torque of the parking pole 22 to the torque of the actuator 4 changes continuously between a park lock position, which is a first switching position, and a park lock release position, which is a second switching position. The parking device 1 includes a manual plate 26 with a set torque ratio, a cam plate 29 that is rotated by the actuator 4 and has a first cam groove 291 including a radius-changing groove 291a, a first pin 28 that engages with the first cam groove 291, and a first rod 27 that is connected to the first pin 28 and engages with the manual plate 26. The first rod 27 has one end 27a that is connected to the first pin 28, the other end 27b that engages with the manual plate 26, and an extension 27c that connects the one end 27a and the other end 27b. The first cam groove 291 and the extension portion 27c overlap at a position in the axial direction D, which corresponds to the depth direction of the first cam groove 291.

[0087] With this configuration, it is possible to prevent the extension portion 27c from being offset in the axial direction D with respect to the first cam groove 291. Therefore, it is possible to prevent a torsional moment from being generated in the first rod 27 when the first rod 27 is actuated, and thus it is possible to suppress the sliding resistance generated in the first pin 28. As a result, it is possible to suppress torque loss, which contributes to ensuring the driving torque.

[0088] In this embodiment, the center position D1 of the first cam groove 291 in the axial direction D overlaps with the positional range R of the extension portion 27c in the axial direction D. With this configuration, it is possible to limit as much as possible the offset of the extension portion 27c in the axial direction D from the center position D1 of the first cam groove 291. As a result, it is possible to suppress torque loss as much as possible.

[0089] The parking device 1 may be configured as follows. FIG. 11 is a diagram showing a modified example of the parking device 1. FIG. 11 shows a cross section similar to FIG. 9. In this example, the one end 27a extends from the connection with the extension portion 27c along the axial direction D toward the opposite side to the reduction gear 5, and then extends along the extension direction of the extension portion 27c toward the cam plate side. The intervening pin 271 has an expanded diameter at one end and is inserted into the first pin 28 from the other end. The intervening pin 271 is fixed to the first rod 27 at the other end while passing through the first pin 28. In this example as well, the extension portion 27c and the first cam groove 291 overlap in the axial direction D. This suppresses torque loss and contributes to ensuring the drive torque. In this example as well, the center position D1 of the first cam groove 291 in the axial direction D overlaps with the position range R of the extension portion 27c in the axial direction D. Furthermore, the center position D1 of the first cam groove 291 in the axial direction D overlaps with the center position D2 of the extension portion 27c in the axial direction D. This makes it possible to minimize torque loss and also to prevent torque loss.

[0090] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments.

[0091] In the above embodiment, the torque ratio is continuously changed between the park lock position and the park lock released position by transmitting power from the cam plate 29 having the first cam groove 291 to the manual plate 26 via the first rod 27. However, the structure for continuously changing the torque ratio is not limited to the above.

[0092] For example, the first cam groove 291 may be provided in the manual plate 26. In this case, the first rod 27 may be structured so that one end side of the first rod 27 rotatably engages with the cam plate 29 and the other end side of the first rod 27 is provided on the first pin 28. [Explanation of symbols]

[0093] 1 Park equipment 21 Parking Gear 22 Parking Pole 26 Manual plate (rotating plate) 27 1st Rod (Rod) 27a One end 27b Other end 27c Extension part 28 1st pin (pin) 29 Cam plate 291 First cam groove (cam groove) 291a Radius change groove 4 Actuators D Axial direction (cam groove depth direction) D1 center position L Reference center line P1 1st position P2 2nd position R Position Range W1 First cam wall W2 Second cam wall WTH groove width

Claims

1. A parking device comprising an actuator for operating a parking pole, the parking pole being engaged with a parking gear to perform a parking lock, and a torque ratio of an operating torque of the parking pole to a torque of the actuator being continuously changed between a park lock position which is a first switching position and a park lock release position which is a second switching position, A rotation actuation plate that is rotated by the actuator; a rotation plate in which the torque ratio is set and which transmits the torque of the actuator to the parking pole; a cam groove including a radius changing groove provided on the rotary operation plate or the rotary plate; A pin that engages with the cam groove; a rod connected to the pin and engaging with the rotary actuation plate or the rotary plate not provided with the cam groove, for transmitting torque of the actuator from the rotary actuation plate to the rotary plate; the radius-changing groove has a radius that gradually increases as the angular position on the rotation operation plate or the rotation plate on which the cam groove is provided approaches the park lock release side, and has a first cam wall that guides the pin when transitioning from the park lock position to the park lock release position, and a second cam wall that guides the pin when transitioning from the park lock release position to the park lock position, The first cam wall and the second cam wall have a varying shape that changes the groove width of the radius varying groove. A parking device characterized by:

2. The parking device according to claim 1, A first position where the pin is located at the park lock position and a second position where the pin is located at the park lock release position are located within a range in which the change shape is provided in an extension direction of the radius change groove, The change shape is a shape in which the groove width of each of the first cam wall and the second cam wall gradually increases in a direction from one end side to the other end side, and then gradually decreases in a manner that reverses from the increase. A parking device characterized by:

3. A parking device comprising an actuator for operating a parking pole, the parking pole being engaged with a parking gear to perform a parking lock, and a torque ratio of an operating torque of the parking pole to a torque of the actuator being continuously changed between a park lock position which is a first switching position and a park lock release position which is a second switching position, A rotation actuation plate that is rotated by the actuator; a rotation plate in which the torque ratio is set and which transmits the torque of the actuator to the parking pole; a cam groove including a radius changing groove provided on the rotary operation plate or the rotary plate; A pin that engages with the cam groove; a rod connected to the pin and engaging with the rotary actuation plate or the rotary plate not provided with the cam groove, for transmitting torque of the actuator from the rotary actuation plate to the rotary plate; the rod has one end connected to the pin, the other end engaging with the rotation actuation plate or the rotation plate not provided with the cam groove, and an extension connecting the one end and the other end, The cam groove and the extension portion overlap each other in a depth direction of the cam groove. A parking device characterized by:

4. The parking device according to claim 3, a center position of the cam groove in a depth direction of the cam groove overlaps with a positional range of the extension portion in the depth direction of the cam groove; A parking device characterized by:

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