JP6633900B2 - Parking mechanism - Google Patents

Description

  The present invention relates to a parking mechanism.

  2. Description of the Related Art Conventionally, a parking device that moves a parking pole by controlling an operating oil pressure supplied to a hydraulic cylinder is disclosed in Japanese Patent Application Laid-Open No. H11-163,837. Further, the parking device disclosed in Patent Document 1 includes a lock mechanism that controls the current supply to the coil of the holding solenoid to switch the engagement state between the roller and the concave portion to prevent the parking rod from moving.

JP 2008-128444 A

  However, in the above-described parking device, since the hydraulic cylinder and the lock mechanism are arranged side by side in the axial direction (moving direction) of the parking rod, the overall length of the parking device in the axial direction of the parking rod increases.

  The present invention has been made to solve such a problem, and has as its object to reduce the overall length of a parking device having a lock mechanism.

The parking mechanism according to an aspect of the present invention has a pressure receiving surface to which the operating oil pressure is applied, and a park piston that moves integrally with the parking rod according to the operating oil pressure, and a park piston that moves in a direction opposite to the force by the operating oil pressure. The movement of the park piston is restricted by engaging with a biasing means for biasing and a groove provided in a member which is a part of the park piston and which is in contact with the biasing means or is integral with the member in contact with the biasing means. A parking mechanism having a lock mechanism capable of engaging with the urging means, wherein the engagement position between the lock mechanism and the park piston overlaps with the urging means when the lock mechanism is viewed from a direction orthogonal to the moving direction of the park piston.
Further, the parking mechanism according to another aspect of the present invention has a pressure receiving surface to which the operating oil pressure is applied, and a park piston that moves integrally with the parking rod according to the operating oil pressure, and a direction opposite to the force by the operating oil pressure. A parking mechanism comprising: urging means for urging the park piston; and a lock mechanism capable of restricting the movement of the park piston by engaging the park piston inside the urging means, wherein the park piston moves. When the lock mechanism is viewed from a direction orthogonal to the direction, the engagement position between the lock mechanism and the park piston overlaps with the urging means.

  According to this aspect, the total length of the parking mechanism in the movement direction of the park piston can be shortened.

FIG. 2 is a configuration diagram illustrating a parking mechanism according to the embodiment. It is a schematic diagram showing a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The configuration of the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram illustrating a parking mechanism according to the present embodiment. Here, a parking mechanism mounted on a vehicle will be described as an example.

  The parking mechanism 100 includes a parking gear 1, a parking pawl 2, a park piston 3, a chamber 4, a parking rod 5, a hydraulic control valve 6, a lock mechanism 7, an actuator 8, and a controller 9.

  The parking gear 1 is fixed to an outer periphery of an output shaft (not shown), and rotates or stops together with the output shaft.

  The parking pawl 2 abuts on a cam portion 50 of the parking rod 5 described later, swings according to the movement of the parking rod 5, and the state of engagement with the parking gear 1 is changed.

  When the parking pawl 2 is engaged with the parking gear 1, the parking gear 1 is mechanically locked and the output shaft is also locked. Thereby, the movement of the vehicle is regulated. When the engagement between the parking pawl 2 and the parking gear 1 is released, the lock between the parking gear 1 and the output shaft is released, and the parking gear 1 and the output shaft become rotatable. Thereby, the movement restriction of the vehicle is released.

  The park piston 3 includes a piston section 30 and a rod section 31. The park piston 3 is supported by the chamber 4 so as to be movable in the axial direction of the rod portion 31.

  The piston section 30 is provided in the chamber 4 and partitions the inside of the chamber 4 into a first chamber 43 and a second chamber 44. The piston section 30 is slidable in the chamber 4. A concave portion 31a is formed on the outer peripheral wall of the piston portion 30 over the entire circumference, and a seal member 31b is provided in the concave portion 31a. The first chamber 43 and the second chamber 44 are isolated by the seal member 31b. The piston portion 30 includes a stopper 31c extending toward the second chamber 44. The stopper 31c restricts the movement of the park piston 3 toward the bottom 40 when it comes into contact with the bottom 40 of the chamber 4 described later.

  The rod part 31 penetrates the chamber 4, one end of the rod part 31 protruding from the chamber 4 is connected to the sensor holder 10, and the other end is connected to the parking rod 5 using the bolt 11 or the like. Connected. The piston part 30 is attached to the rod part 31, and the rod part 31 and the piston part 30 move in the axial direction of the rod part 31 integrally. That is, the axial direction of the rod portion 31 matches the moving direction of the park piston 3. The rod portion 31 is formed with two engagement grooves 32 with which a claw portion 71 of the lock mechanism 7 described later can be engaged at predetermined intervals in the axial direction.

  The engagement groove 32 is formed in the rod portion 31 located closer to the second chamber 44 than the piston portion 30 is. The engagement groove 32 engages with the first engagement groove 32a into which the claw 71 of the lock mechanism 7 is inserted when the output shaft is locked when the parking pawl 2 is engaged with the parking gear 1, and the parking pawl 2 is engaged with the parking gear 1. The second engaging groove 32b into which the claw portion 71 of the lock mechanism 7 is inserted when the output shaft is not released. That is, the predetermined interval is set in accordance with the amount of movement of the park piston 3 that switches the state of engagement between the parking pawl 2 and the parking gear 1.

  The first engagement groove 32a is provided with a margin allowing the park piston 3 to move by a predetermined amount in the axial direction when the claw portion 71 is inserted into the first engagement groove 32a. For example, when the claw portion 71 comes into contact with and engages with the wall surface 32c forming the first engagement groove 32a, a predetermined amount of gap is formed between the opposite wall surface 32d and the claw portion 71. The second engagement groove 32b is also provided with a margin allowing the park piston 3 to move by a predetermined amount in the axial direction. The predetermined amount is set within a range that does not affect the state of engagement between parking pole 2 and parking gear 1. That is, even if the park piston 3 moves in the axial direction with the claw portion 71 inserted into the first engagement groove 32a or the second engagement groove 32b, the engagement state between the parking pawl 2 and the parking gear 1 is maintained. Does not change.

  In this embodiment, the engagement between the claw portion 71 and the engagement groove 32 refers to a state in which the claw portion 71 abuts on the wall surface in the axial direction of the rod portion 31 forming the engagement groove 32. Therefore, it can be said that the state where the claw portion 71 is inserted into the engagement groove 32 is a state where the claw portion 71 can be engaged with the engagement groove 32.

  The chamber 4 is configured such that a lid portion 42 is provided on the opening side of a cylindrical portion 41 having a bottom portion 40, and the opening side is closed by the lid portion 42. In the chamber 4, a first chamber 43 is formed between the lid 42 and the piston 30, and a second chamber 44 is formed between the piston 30 and the bottom 40. A through hole 45a is formed in the bottom portion 40, a through hole 45b is formed in the lid portion 42, and the rod portion 31 is inserted into the through holes 45a and 45b. A concave portion 46a is formed all around the outer peripheral wall of the lid portion 42, and a concave portion 46b is formed all around the inner peripheral wall forming the through hole 45b of the lid portion 42. The recess 46a is provided with a seal member 47a, and the recess 46b is provided with a seal member 47b. Thereby, the liquid tightness of the first chamber 43 is maintained.

  The hydraulic pressure is supplied to and discharged from the first chamber 43 by the hydraulic control valve 6, and the hydraulic pressure in the first chamber 43 increases and decreases. The hydraulic pressure supplied to the first chamber 43 acts on the piston portion 30 to generate a force for pushing the piston portion 30 toward the bottom portion 40. The wall of the piston portion 30 forming the first chamber 43 functions as a pressure receiving surface.

  In the second chamber 44, a compression spring 48 is provided radially inward of the stopper 31c of the piston portion 30. One end of the compression spring 48 abuts the bottom 40 of the chamber 4 and the other end abuts the piston 30. The compression spring 48 generates an urging force on the piston 30 to push the piston 30 toward the lid 42. A gap is formed between the compression spring 48 and the rod portion 31 of the park piston 3, and a first lever 70a of the lock mechanism 7 described later is inserted into the gap.

  The parking rod 5 is connected at one end to the rod 31 of the park piston 3. The parking rod 5 moves in the axial direction of the rod part 31 integrally with the park piston 3. The cam part 50 is attached to the other end of the parking rod 5.

  The diameter of the cam portion 50 becomes smaller as it becomes the tip. The cam portion 50 has an engagement surface 50a for engaging the parking pawl 2 with the parking gear 1, and a release surface 50b for not engaging the parking pawl 2 with the parking gear 1. The release surface 50b is formed on the tip side of the cam portion 50 with respect to the engagement surface 50a. The cam portion 50 comes into contact with the parking pawl 2, moves the parking pawl 2 in accordance with the movement of the park piston 3, and engages or releases the parking pawl 2 with the parking gear 1.

  Here, the contact position between the cam portion 50 and the parking pawl 2 is changed from the release surface 50b to the engaging surface 50a, and the park piston 3 and the parking rod 5 are engaged so that the parking pawl 2 and the parking gear 1 are engaged. Moving is referred to as moving forward. In addition, the contact position between the cam portion 50 and the parking pole 2 is changed from the engagement surface 50a to the release surface 50b, and the parking piston 2 and the parking rod 5 are released so that the engagement between the parking pole 2 and the parking gear 1 is released. Says to move back.

  The lock mechanism 7 includes a lever 70 and a claw 71. The lock mechanism 7 is rotatably supported by the chamber 4 near the bottom 40 of the chamber 4, and rotates around a rotation shaft 73 according to the operation of the actuator 8.

  The lever portion 70 has an L-shaped portion including a first lever 70a extending through the bottom portion 40 of the chamber 4 to the inside of the second chamber 44 and a second lever 70b orthogonal to the first lever 70a. It is formed. The second lever 70b is biased by a spring 72 toward the actuator 8 described later. The spring 72 applies an urging force to the lock mechanism 7 such that the claw 71 is inserted into the engagement groove 32, that is, a counterclockwise moment is generated in the lock mechanism 7 in FIG.

  The claw portion 71 extends from the end of the first lever 70 a extending into the second chamber 44 toward the rod portion 31. The claw portion 71 is formed so as to be able to engage with the engagement groove 32 formed in the rod portion 31. The claw portion 71 is provided in the second chamber 44. That is, when viewed from a direction orthogonal to the axial direction of the park piston 3 (rod portion 31), the engagement position when the claw portion 71 and the engagement groove 32 are engaged overlaps with the compression spring 48. Is provided with a lock mechanism 7.

  Hereinafter, a state in which the claw 71 is inserted into the engagement groove 32 is referred to as a locked state, and a state in which the claw 71 is not inserted into the engagement groove 32, that is, the claw 71 is pulled out of the engagement groove 32. The state is called a released state. The lock mechanism 7 is rotated about the rotation shaft 73 by the actuator 8, and the claw portion 71 is inserted into and removed from the engagement groove 32.

  The actuator 8 is arranged in parallel with the park piston 3. The actuator 8 is disposed such that the actuator 8 and a compression spring 48 disposed in the second chamber 44 overlap when viewed from a direction orthogonal to the axial direction of the park piston 3 (rod portion 31). The actuator 8 is arranged such that when the lock mechanism 7 is in the locked state, the second lever 70b abuts on the end face 8a of the actuator 8, and the second lever 70b is orthogonal to the axial direction of the rod portion 31. That is, when the lock mechanism 7 is in the locked state, the lock mechanism 7 is supported in a predetermined state. The lock mechanism 7 is supported by, for example, the shaft portion 80 of the actuator 8 and a stopper provided separately. The actuator 8 is a solenoid-type actuator, and switches the energized state of a coil (not shown) so that the shaft portion 80 is retracted.

  When the coil of the actuator 8 is not energized, the biasing force of the spring 72 is transmitted to the shaft 80 via the second lever 70b of the lock mechanism 7, and the shaft 80 is pushed into the case 81 of the actuator 8. The second lever 70b contacts the end face 8a of the actuator 8. When the coil of the actuator 8 is energized, the shaft portion 80 protrudes out of the case 81 of the actuator 8 against the urging force of the spring 72, and rotates the second lever 70b (the lock mechanism 7) clockwise in FIG. When the energization of the coil of the actuator 8 is terminated from the energization of the coil of the actuator 8, the second lever 70b (the lock mechanism 7) rotates counterclockwise in FIG. 81, the second lever 70b comes into contact with the end face 8a of the actuator 8.

  Note that the actuator 8 may be a hydraulic actuator that moves the shaft portion 80 by supplying and discharging hydraulic pressure.

  The hydraulic control valve 6 supplies and discharges hydraulic pressure from the first chamber 43 by driving a solenoid 6 a based on an instruction signal from the controller 9.

  The controller 9 detects the position of the park piston 3 or the stroke amount (movement amount) of the park piston 3 based on a signal from the position sensor 101. That is, the controller 9 can detect an engagement state between the parking pawl 2 and the parking gear 1 based on a signal from the position sensor 101. Further, the controller 9 controls the supply current to the solenoid 6a based on a signal from the shift device 102 that detects the position of the shift lever, controls the supply and discharge of the hydraulic pressure to the first chamber 43, and And the parking rod 5 is moved forward or backward, and the parking pawl 2 and the parking gear 1 are engaged or disengaged. Further, the controller 9 controls the actuator 8 based on a signal from the shift device 102 and a signal from the position sensor 101 to rotate the lock mechanism 7.

  The controller 9 includes a CPU, a ROM, a RAM, and the like. In the controller 9, each function of the controller 9 is exhibited by reading the program stored in the ROM by the CPU.

  Next, the operation of the present embodiment will be described.

  When the shift lever is in a range other than the P range, the hydraulic pressure is supplied to the first chamber 43 by the hydraulic pressure control valve 6, and the piston portion 30 moves to the bottom 40 of the chamber 4 against the urging force of the compression spring 48. It is held at the position retracted to the side. Therefore, the park piston 3 and the parking rod 5 are also held at the retracted position, and the parking mechanism 100 is held in a state where the engagement between the parking pawl 2 and the parking gear 1 is released.

  Further, the lock mechanism 7 is in a locked state in which the claw portion 71 is inserted into the second engagement groove 32b. Therefore, when the hydraulic pressure supplied to the first chamber 43 decreases due to a failure of the hydraulic control valve 6 or the like, the pawl portion 71 engages with the second engagement groove 32b, and the lock mechanism 7 moves the park piston 3. Is regulated, the parking mechanism 100 is maintained in a state where the engagement between the parking pawl 2 and the parking gear 1 is released.

  When the shift lever is changed from the range other than the P range to the P range, the lock mechanism 7 is rotated to change the lock mechanism 7 from the locked state to the released state, and the first chamber 43 is controlled by the hydraulic control valve 6. Drain hydraulic pressure from As a result, the park piston 3 and the parking rod 5 move forward by the urging force of the compression spring 48, the parking pawl 2 is engaged with the parking gear 1, and the movement of the vehicle is regulated by the parking mechanism 100.

  When the lock mechanism 7 is rotated, the hydraulic pressure is discharged from the first chamber 43 by the hydraulic control valve 6 and the lock mechanism 7 is rotated while the claw portion 71 is engaged with the second engagement groove 32b. You may. As a result, the pawl 71 is engaged with the wall surface of the second engaging groove 32b, so that a moment is generated in the lock mechanism 7 clockwise in FIG. When such a moment is generated, the force for rotating the lock mechanism 7 by the actuator 8 when the lock mechanism 7 is changed from the locked state to the released state can be reduced, and the locking by the small actuator 8 can be performed. The mechanism 7 can be rotated. Therefore, the length of the parking mechanism 100 in the direction orthogonal to the axial direction of the rod portion 31 can be reduced.

  When the parking piston 2 and the parking rod 5 move forward to a position where the parking pawl 2 engages with the parking gear 1, the actuator 8 rotates the lock mechanism 7 to change the lock mechanism 7 from the released state to the locked state. In the present embodiment, by stopping the energization of the coil of the actuator 8, the lock mechanism 7 is rotated by the urging force of the spring 72, and the lock mechanism 7 is locked. In this locked state, the claw portion 71 is engaged with the first engagement groove 32a. As a result, even when the hydraulic pressure is supplied to the first chamber 43 due to a failure of the hydraulic control valve 6, for example, the movement of the park piston 3 is restricted by the lock mechanism 7, so that the parking mechanism 100 1 is maintained in an engaged state.

  When the shift lever is changed from the P range to a range other than the P range, the lock mechanism 7 is rotated by the actuator 8 to change the lock mechanism 7 from the locked state to the released state. The hydraulic pressure is supplied to the chamber 43. As a result, the park piston 3 and the parking rod 5 retreat against the urging force of the compression spring 48, the engagement between the parking pawl 2 and the parking gear 1 is released, and the movement restriction of the vehicle is released.

  When the parking piston 2 and the parking rod 5 retreat to a position where the parking pawl 2 is not engaged with the parking gear 1, the actuator 8 rotates the lock mechanism 7 to change the lock mechanism 7 from the released state to the locked state.

  The effects of the embodiment of the present invention will be described.

  If the lock mechanism and the actuator are provided side by side in the direction of movement of the park piston instead of the configuration of the present embodiment, the overall length of the parking mechanism in the direction of movement of the park piston may be increased, and the vehicle layout may be limited.

  In the present embodiment, the insertion position where the claw portion 71 of the lock mechanism 7 is inserted into the engagement groove 32 of the park piston 3 overlaps with the compression spring 48 when viewed from a direction orthogonal to the movement direction of the park piston 3. Thus, the lock mechanism 7 is provided. Thus, the overall length of the parking mechanism 100 in the movement direction of the park piston 3 can be shortened, and the degree of freedom of the vehicle layout can be increased (an effect corresponding to claim 1).

  The parking mechanism 100 in the movement direction of the park piston 3 is arranged by arranging the actuator 8 so that the actuator 8 that operates the lock mechanism 7 overlaps the compression spring 48 when viewed from a direction orthogonal to the movement direction of the park piston 3. Can be shortened (the effect corresponding to claim 3).

  By shortening the overall length of the parking mechanism 100, it is particularly easy to mount the parking mechanism 100 on an FF (front engine / front drive) vehicle.

  Next, a modified example of the present embodiment will be described with reference to FIG. FIG. 2 is a schematic view showing a part of a parking mechanism according to a modification.

  In a modified example, the engagement groove 202 of the park piston 201 is provided radially outside of the compression spring 203, and the claw 205 of the lock mechanism 204 moves in a direction perpendicular to the movement direction of the park piston 201. Even in such a configuration, the overall length of the parking mechanism 200 can be shortened.

  Comparing the present embodiment with the comparative example, in the present embodiment, the insertion position where the claw portion 71 of the lock mechanism 7 is inserted into the engagement groove 32 of the park piston 3 is set radially inward of the compression spring 48. I have. Specifically, the engagement groove 32 is provided in the rod portion 31 of the park piston 3. Thus, the lock mechanism 7 can be locked without increasing the rigidity of the lock mechanism 7 and the park piston 3.

  As in the comparative example, when the engagement position between the claw portion 205 of the lock mechanism 204 and the engagement groove 202 of the park piston 201 is provided radially outside the compression spring 203, the lock mechanism 204 and the park piston 201 If the rigidity is low, for example, when the movement of the park piston 201 is restricted by the lock mechanism 204, the park piston 201 near the engagement groove 202 may be deformed.

  Also in the comparative example, deformation of the lock mechanism 204 and the park piston 201 can be prevented by increasing the rigidity of the lock mechanism 204 and the park piston 201. However, in order to increase the rigidity of the lock mechanism 204 and the park piston 201, each member may be enlarged, and the parking mechanism 200 may be enlarged.

  On the other hand, in the present embodiment, the insertion position where the claw portion 71 of the lock mechanism 7 is inserted into the engagement groove 32 of the park piston 3 is located radially inward of the compression spring 48, so that the lock mechanism is more locked than the comparative example. The deformation of the lock mechanism 7 and the park piston 3 can be prevented without increasing the rigidity of the mechanism 7 and the park piston 3. Thereby, the parking mechanism 100 can be reduced in size as compared with the comparative example (an effect corresponding to claim 2).

  As described above, the embodiment of the present invention has been described. However, the above embodiment is only a part of an application example of the present invention, and the technical scope of the present invention is not limited to the specific configuration of the above embodiment. Absent.

  In the above embodiment, the parking rod 5 and the park piston 3 are configured as separate members, but they may be configured as a single member. That is, the movement of the parking rod 5 and the park piston 3 integrally includes that one member has the function of the parking rod 5 and the park piston 3, and that member moves.

  Further, in the above embodiment, the lock mechanism 7 may be moved in a direction orthogonal to the axial direction of the park piston 3 to change the lock mechanism 7 between the locked state and the released state.

1: Parking gear 2: Parking pole 3: Park piston 4: Chamber 5: Parking rod 6: Hydraulic control valve 7: Lock mechanism 8: Actuator 9: Controller 30: Piston section 32: Engagement groove 32a: First engagement groove 32b: second engagement groove 43: first chamber 44: second chamber 48: compression spring (biasing means)
71: claw portion 100: parking mechanism 200: parking mechanism 201: park piston 202: engagement groove 203: compression spring (biasing means)
204: Lock mechanism 205: Claw section

Claims (3)

A park piston having a pressure receiving surface to which the operating oil pressure is applied, and moving integrally with the parking rod according to the operating oil pressure;
Urging means for urging the park piston in a direction opposite to the force by the operating oil pressure,
A lock mechanism that is a part of the park piston and that can regulate the movement of the park piston by engaging a groove provided in a member abutting on the urging means or a member integrated with the abutting member. A parking mechanism comprising:
When the lock mechanism is viewed from a direction perpendicular to the movement direction of the park piston, an engagement position between the lock mechanism and the park piston overlaps with the biasing unit.
A parking mechanism, characterized in that: A park piston having a pressure receiving surface to which the operating oil pressure is applied, and moving integrally with the parking rod according to the operating oil pressure;
Urging means for urging the park piston in a direction opposite to the force by the operating oil pressure,
A parking mechanism having a lock mechanism capable of restricting the movement of the park piston by engaging with the park piston inside the urging means,
When the lock mechanism is viewed from a direction orthogonal to the movement direction of the park piston, an engagement position between the lock mechanism and the park piston overlaps with the biasing unit.
A parking mechanism, characterized in that: The parking mechanism according to claim 1 or 2,
An actuator that operates the lock mechanism,
When the actuator is viewed from a direction orthogonal to the movement direction of the park piston, the actuator overlaps the biasing unit,
A parking mechanism, characterized in that:

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