JP2017166637A - Parking actuator valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parking actuator valve which enables parking lock to be properly performed.SOLUTION: A parking actuator valve 25 includes: a cylinder 26; a piston 27; a first lock oil chamber 29A and a second lock oil chamber 29B; and a first unlock oil chamber 30A and a second unlock oil chamber 30B. One end of a parking cylinder includes a closing part 320 integrally formed with the parking cylinder. The other end of the parking cylinder is provided with a valve cap 310 which closes the other end of the parking cylinder. The first unlock oil chamber 30A and the second unlock oil chamber 30B are disposed at a side where the valve cap 310 is provided, and the first lock oil chamber 29A and the second lock oil chamber 29B are disposed at a side where the closing part 320 is provided.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a parking actuator valve used in a transmission.

  2. Description of the Related Art Conventionally, a parking lock device is known that prevents rotation of an output shaft of an automatic transmission and maintains a stopped state of a vehicle (see, for example, Patent Document 1). This parking lock device is operated by a parking actuator valve operated by a hydraulic circuit. In the thing of patent document 1, the output shaft of a transmission is locked with the urging | biasing force of a spring.

Special table 2008-503695 gazette

  In the parking actuator valve of Patent Document 1, there is a possibility that the parking lock cannot be performed due to a component deterioration type failure or assembly failure of the spring.

  In view of the above, an object of the present invention is to provide a parking actuator valve that can appropriately perform parking locking.

[1] In order to achieve the above object, the parking actuator valve of the present invention (for example, the hydraulic actuator 25 of the embodiment; the same applies hereinafter)
A parking cylinder (for example, the cylinder 26 of the embodiment; the same applies hereinafter);
A parking piston slidable in the parking cylinder (for example, the piston 27 in the embodiment; the same applies hereinafter)
A parking lock oil chamber (for example, the first lock oil chamber 29A and the second lock oil chamber 29B in the embodiment; the same applies hereinafter) to which hydraulic pressure for moving the parking piston to the parking lock position is supplied;
A parking release oil chamber (for example, the first unlocking oil chamber 30A and the second unlocking oil chamber 30B in the embodiment; the same applies hereinafter) to which hydraulic pressure for moving the parking piston to the parking release position is supplied. With
One end of the parking cylinder includes a closing portion (for example, the closing portion 320 of the embodiment; the same applies hereinafter) formed integrally with the parking cylinder.
The other end of the parking cylinder is provided with a valve cap that closes the other end of the parking cylinder (for example, the valve cap 310 of the embodiment, the same applies hereinafter),
The parking release oil chamber is located on the side where the valve cap is provided.
The parking lock oil chamber is arranged on the side where the closed portion of the parking cylinder is provided.

  According to the present invention, the parking lock oil chamber is provided on the closed portion side even when the hydraulic pressure cannot be properly supplied to the parking release oil chamber due to a malfunction of the parking cap. Regardless, the parking lock can be activated appropriately.

  [2] In the present invention, it is preferable that the parking cylinder is arranged to extend in the vertical direction, and the parking lock oil chamber is arranged below the parking piston. According to this configuration, by releasing the hydraulic pressure of the parking lock oil chamber, the parking piston can be lowered downward by its own weight, and the parking lock is released even when the hydraulic pressure cannot be properly supplied to the parking release oil chamber. be able to.

[3] Further, the parking actuator valve of the present invention includes:
A parking cylinder,
A parking piston slidable in the parking cylinder;
Parking lock oil chamber,
A parking release oil chamber,
The parking piston can be switched between a parking lock position and a parking release position.
The parking cylinder extends vertically,
The parking lock oil chamber is located below the parking piston.

  According to the present invention, by releasing the hydraulic pressure of the parking lock oil chamber, the parking piston can be lowered downward by its own weight, and the parking lock is released even when the hydraulic pressure cannot be properly supplied to the parking release oil chamber. be able to.

[4] Further, the parking actuator valve of the present invention includes:
A parking cylinder,
A parking piston slidable in the parking cylinder;
Parking lock oil chamber,
A parking release oil chamber,
The parking piston can be switched between a parking lock position and a parking release position.
The parking cylinder extends vertically,
The parking release oil chamber is located below the parking piston.

  According to the present invention, by releasing the oil pressure of the parking release oil chamber, the parking piston can be lowered by its own weight, and the parking lock is operated even when the oil pressure cannot be properly supplied to the parking lock oil chamber. be able to.

Explanatory drawing which shows embodiment of the parking actuator valve of this invention. Explanatory drawing which shows the parking lock apparatus connected to the parking actuator valve of this embodiment. Explanatory drawing which shows the hydraulic circuit which operates the parking actuator valve of this embodiment. Explanatory drawing which shows the parking actuator valve of this embodiment.

  With reference to FIGS. 1 to 4, an embodiment of a parking lock device including a parking actuator valve of the present invention will be described.

  As shown in FIG. 1, the parking lock device of the present embodiment includes a parking gear 12 fixed to the output shaft 11 of the automatic transmission and a parking pole 14 pivotally supported by the support shaft 13. A locking claw 14 a is provided at one end of the parking pole 14.

  As shown in FIG. 2, the parking pole 14 is urged by a spring 15 in a direction in which the locking claw 14 a is detached from the tooth groove 12 a of the parking gear 12.

  Further, the parking lock device includes a detent plate 17 pivotally supported by the support shaft 16 and a parking rod 18 pivotally supported by a pin 19 on one end of the detent plate 17. A cone-shaped cam 20 is provided at the other end of the parking rod 18. A cam follower 14 b is provided at the other end of the parking pole 14. The cam 20 is disposed so as to be in contact with the cam follower 14b.

  At the other end of the detent plate 17, two concave portions 17a and 17b are provided. A detent roller 22 provided at one end of a swingable arm 21 is engaged with one of the recesses 17 a and 17 b while being urged by a spring 23. One end of the detent plate 17 is connected to the piston 27 with a pin 28.

  The piston 27 is slidably inserted into the cylinder 26. A first lock oil chamber 29 </ b> A and a second lock oil chamber 29 </ b> B for driving the piston 27 in the direction in which the parking lock operates (upward) are formed on the lower end side of the cylinder 26. The first unlocking oil chamber 30A and the second unlocking oil chamber 30B for driving the piston 27 in the direction (downward) in which the parking lock is released are formed.

  When hydraulic pressure is supplied to the first lock oil chamber 29A and the second lock oil chamber 29B, the piston 27 moves upward, and the cam is moved via the detent plate 17 and the parking rod 18 in conjunction with the movement of the piston 27. 20 advances and pushes up the cam follower 14b of the parking pole 14.

  The parking pole 14 whose cam follower 14b is pushed up by the cam 20 swings around the support shaft 13 against the elastic force of the spring 15, and the locking claw 14a is one of the tooth grooves 12a of the parking gear 12. Is engaged, the parking lock is actuated and the movement of the vehicle is suppressed. In the parking lock operating state, the detent roller 22 is engaged with the concave portion 17b of the detent plate 17, and the state is stably maintained.

  On the other hand, when the hydraulic pressure is supplied to the first unlocking oil chamber 30A and the second unlocking oil chamber 30B, the piston 27 moves downward, and the locking pawl 14a of the parking pole 14 engages the tooth groove of the parking gear 12. By disengaging from 12a, the parking lock is released and the vehicle can move. In the parking lock release state, the detent roller 22 is engaged with the recess 17a of the detent plate 17, and the state is stably maintained.

  Next, the hydraulic circuit 31 that controls the operation of the piston 27 will be described with reference to FIG.

  The hydraulic circuit 31 includes an on / off type solenoid valve 32A that supplies a line pressure supplied from a hydraulic pump (not shown) to the oil passage L1 to the first lock oil chamber 29A, and a check valve downstream of the oil passage L1. And an on / off-type solenoid valve 32B for supplying the line pressure of the oil passage L2 connected through the second lock oil chamber 29B to the second lock oil chamber 29B. The solenoid valve 32A directly supplies line pressure to the first lock oil chamber 29A by opening the valve, while the solenoid valve 32B opens the first ball valve 33A by opening the valve. The solenoid valve 32A is a normally closed type, and the solenoid valve 32B is a normally open type.

  The hydraulic circuit 31 includes an on / off solenoid valve 32C that supplies line pressure to the first unlocking oil chamber 30A via the oil passage L3, and a line pressure of the oil passage L4 that branches upstream of the check valve 36. Is provided to the second unlocking oil chamber 30B.

  Conventionally, the line pressure from the solenoid valve 32D is directly supplied to the second unlocking oil chamber 30B. However, in the parking lock device of this embodiment, the oil passage L4 (the third oil passage of the present invention) is supplied. Correspondingly, a hydraulic cut valve 112 is interposed.

  The hydraulic cut valve 112 includes a cylinder 114, a spool 116 that is slidably inserted into the cylinder 114, and a spring 118 that biases the spool 116 toward one of the cylinders 114 (leftward in FIG. 3).

  On the outer periphery of the cylinder 114, an input port 114a to which the line pressure of the oil passage L4 is input, an output port 114b, and a discharge port 114c are provided. A switching port 114d that branches from the oil passage L4 and supplies line pressure to one end of the cylinder 114 is provided at one end (the left end in FIG. 3) of the cylinder 114.

  When the line pressure increases to a predetermined hydraulic pressure that can move the spool 116 against the urging force of the spring 118, the input port 114a and the output port 114b communicate with each other via the spool 116. The hydraulic cut valve 112 is opened, and the line pressure is supplied to the second unlocking oil chamber 30B. Conversely, when the line pressure is less than the predetermined oil pressure, the output port 114b and the discharge port 114c communicate with each other, and the oil pressure is released from the second unlocking oil chamber 30B via the discharge port 114c.

  In the present embodiment, the spring 118 of the hydraulic cut-off valve 112 has an oil passage L1 (corresponding to the fourth oil passage of the present invention) when the hydraulic circuit 31 is started, such as when the vehicle power is turned on. And the line pressure supplied to the first lock oil chamber 29A, which is the other end of the piston 27, and the second unlock oil chamber 30B, which is the one end of the piston 27, via the oil passage L4. The hydraulic cut valve 112 is set to open when the hydraulic pressure is equal to or higher than a predetermined hydraulic pressure that is set based on the difference in rising from the line pressure.

  As a result, when the hydraulic circuit 31 is started, the line pressure in the oil passage L4 is reduced even when there is a difference between the rise of the line pressure in the oil passage L1 and the rise of the line pressure in the oil passage L4. It is possible to prevent rising earlier than the line pressure in the path L1, and the piston 27 malfunctions due to the difference in rising characteristics of the line pressure, specifically, the instruction to move the piston 27 to the parking lock position is issued. Nevertheless, it is possible to prevent the piston 27 from starting to the parking lock release position.

  Accordingly, it is possible to quickly respond to the driver's operation without waiting until the piston 27 returns to the parking lock position again.

  The oil passage L4 is provided with a first choke 122 that is positioned upstream of the hydraulic cut valve 112 and narrows the passage. The first choke 122 is constituted by a slot groove of a separate plate. If the first choke 122 is formed by the slot groove of the separate plate in this way, there is no need to separately provide a first choke member, the number of parts can be reduced, and the assembly of the parking lock device can be simplified. it can.

  Further, in parallel with the first choke 122, the supply of hydraulic pressure to the second unlocking oil chamber 30B is blocked, and the hydraulic pressure is released from the second unlocking oil chamber 30B via the hydraulic cut valve 112. A permissible first check valve 132 is provided. By providing the first check valve 132, the hydraulic pressure can be released quickly.

  The solenoid valve 32C supplies the line pressure to the first unlocking oil chamber 30A by moving the spool of the parking inhibit valve 35 to the right side in FIG. 3 against the urging force of the spring by opening the solenoid valve 32C. Conversely, when the solenoid valve 32C is closed, the spool of the parking inhibit valve 35 is urged by the spring and moves to the left in FIG. 3, thereby draining the line pressure in the first unlocking oil chamber 30A. The solenoid valve 32C is a normally closed type, and the solenoid valve 32D is a normally closed type.

  A second choke 222 having a narrow flow path is provided upstream of the parking inhibit valve 35 in the oil path L3. The second choke 222 is constituted by a slot groove of a separate plate. As described above, if the second choke 222 is configured by the slot groove of the separate plate, there is no need to separately provide a second choke member, the number of parts can be reduced, and the assembly of the parking lock device can be simplified. Can do.

  Further, a second check valve which is arranged in parallel with the second choke 222 and prevents the hydraulic pressure from being supplied to the first unlocking oil chamber 30A and allows the hydraulic pressure to be released from the first unlocking oil chamber 30A. 232 is provided. By providing the second check valve 232, the hydraulic pressure can be released quickly.

  A pressure accumulation chamber 37a of the accumulator 37 is connected to the oil passage L2 between the check valve 36 and the solenoid valve 32B.

  A lockup clutch shift valve 39 is connected to the oil passage L1 downstream of the solenoid valve 32A, and the lockup clutch pressure of the oil passage L5 is applied to the lockup clutch 40a of the torque converter 40 which is a starting mechanism. It is supplied via a shift valve 39.

  An oil passage L6 downstream of the check valve 36 is connected to a hydraulic brake 41, which is a hydraulic engagement device for shifting, and a linear solenoid valve 42 and a brake cut valve 43 are arranged in the oil passage L6. The brake cut valve 43 is driven to open and close by a solenoid valve 32D. The linear solenoid valve 42 includes an import 42a, an out port 42b, and a drain port 42c. The hydraulic pressure input from the import 42a is regulated and output from the out port 42b, or the hydraulic pressure is released from the out port 42b through the drain port 42c. You can make it.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  When the driver selects the D range or the R range with a shift operation unit such as a shift lever and the vehicle is traveling at a predetermined gear position, the line pressure generated by the hydraulic pump driven by the internal combustion engine is the oil path. The oil pressure in the oil passage L1 is transmitted to the oil passage L2, the oil passage L4, and the oil passage L6 through the check valve 36. The line pressure is supplied to the oil passage L2, and the hydraulic pressure is accumulated in the accumulator 37a of the accumulator 37.

  The normally closed solenoid valve 32C is energized to open when energized, and the normally closed solenoid valve 32D is also energized to open by energizing. Then, the spool of the parking inhibit valve 35 moves to the right in FIG. 3 by opening the solenoid valve 32C, so that the line pressure of the oil passage L3 is changed to the first unlocking oil of the hydraulic actuator 25 via the parking inhibit valve 35. It is transmitted to the chamber 30A. Further, the line pressure of the oil passage L4 is transmitted to the second unlocking oil chamber 30B by opening the solenoid valve 32D.

  On the other hand, the normally closed solenoid valve 32A is closed when power supply is stopped, and the normally open solenoid valve 32B is excited by energization to close. When the solenoid valve 32A is closed, the oil in the first lock oil chamber 29A of the hydraulic actuator 25 is drained from the solenoid valve 32A, and the first ball valve 33A is closed by closing the solenoid valve 32B. The oil in the 2-lock oil chamber 29B is drained from the first ball valve 33A. As a result, the piston 27 moves to the left side of FIG. 3 and the parking lock is released.

  The flow rate of oil that can pass through the solenoid valve 32B is relatively small, but the flow rate of oil that can pass through the first ball valve 33A that is opened and closed by the solenoid valve 32B is relatively large. For this reason, the operation responsiveness of the piston 27 can be enhanced by interposing the first ball valve 33A.

  As described above, while the vehicle is running, the solenoid valve 32A and the solenoid valve 32B are closed and the solenoid valve 32C and the solenoid valve 32D are opened, so that the piston 27 is operated to the unlocked position and the parking lock is performed. It can be released.

  In addition, the parking lock device includes two first lock oil chambers 29A and second lock oil chambers 29B, and includes two first unlock oil chambers 30A and second unlock oil chambers 30B. Therefore, even if one of the solenoid valve 32C and the solenoid valve 32D is fixed in the closed state and no hydraulic pressure is supplied to the first unlocking oil chamber 30A or the second unlocking oil chamber 30B, or the solenoid valve 32A Even when one of the solenoid valves 32B is fixed in the open state and hydraulic pressure is supplied to the first lock oil chamber 29A or the second lock oil chamber 29B, the hydraulic actuator 25 is operated to the unlock position without any trouble. Redundancy can be ensured.

  The solenoid valve 32C is opened at the first predetermined shift stage, and the solenoid valve 32D is opened at the second predetermined shift stage, and the first predetermined shift stage and the second predetermined shift stage. The predetermined gear position partially overlaps. Accordingly, the line pressure is supplied only to the first unlocking oil chamber 30A and the line pressure is supplied only to the second unlocking oil chamber 30B according to the gear stage established at that time. In some cases, the line pressure is supplied to both the first unlocking oil chamber 30A and the second unlocking oil chamber 30B. In either case, the piston 27 moves to the left in FIG. Since the parking lock is released, there is no problem. In the overlapping gear position, the line pressure is supplied to both the first unlocking oil chamber 30A and the second unlocking oil chamber 30B, so that the solenoid valve 32C or the solenoid valve 32D fails and the line pressure is supplied. Even if the operation is interrupted, the parking lock is kept in the released state to increase the redundancy.

  When the vehicle is stopped by operating a shift operation unit such as a shift lever to the P range while the internal combustion engine is operating, the solenoid valve 32A and the solenoid valve 32B are opened, and the solenoid valve 32C and the solenoid valve 32D are Close the valve. The line pressure of the oil passage L1 is transmitted to the first lock oil chamber 29A of the hydraulic actuator 25 by opening the solenoid valve 32A, and the first ball valve 33A is opened by opening the solenoid valve 32B, and the oil passage The line pressure L2 is transmitted to the second lock oil chamber 29B of the hydraulic actuator 25.

  On the other hand, when the solenoid valve 32C is closed, the hydraulic fluid in the first unlocking oil chamber 30A of the hydraulic actuator 25 is discharged from the parking inhibit valve 35, and when the solenoid valve 32D is closed, the second hydraulic actuator 25 is closed. The hydraulic oil in the unlocking oil chamber 30B is discharged from the solenoid valve 32D. As a result, the piston 27 moves to the right side of FIG. 3 and the parking lock is activated.

  As described above, when the P range is selected by the shift operation unit while the internal combustion engine is operated, the solenoid valve 32A and the solenoid valve 32B are opened, and the solenoid valve 32C and the solenoid valve 32D are closed, whereby the piston 27 Can be actuated to the locked position. At this time, the parking lock device includes two first lock oil chambers 29A and second lock oil chambers 29B, and two first unlock oil chambers 30A and second unlock oil chambers 30B. Therefore, even if one of the solenoid valve 32C and the solenoid valve 32D is fixed in the open state and the hydraulic pressure is supplied to the first unlocking oil chamber 30A or the second unlocking oil chamber 30B, or the solenoid valve 32A Even if one of the solenoid valves 32B is fixed in the closed state and no hydraulic pressure is supplied to the first lock oil chamber 29A or the second lock oil chamber 29B, the hydraulic actuator 25 is operated to the lock position without any trouble. Redundancy can be ensured.

  In the present embodiment, the hydraulic actuator 25 corresponds to the parking actuator valve of the present invention.

  When the shift operation unit is operated to the P range and the ignition (vehicle power supply) is turned off, the internal combustion engine is stopped and the line pressure due to the pump driven by the internal combustion engine disappears. However, according to the present embodiment, the parking lock device can be operated without hindrance by the hydraulic pressure accumulated in the accumulator 37.

  When the solenoid valve 32B is opened, the hydraulic pressure of the accumulator 37 is transmitted to the second lock oil chamber 29B, and when the solenoid valve 32C is closed, the hydraulic oil in the first unlock oil chamber 30A is parked. While being discharged from the valve 35, the hydraulic oil in the second unlocking oil chamber 30B is discharged from the solenoid valve 32D by closing the solenoid valve 32D. As a result, the piston 27 moves to the right side of FIG. 3 and the parking lock is activated.

  As described above, even if the line pressure disappears by selecting the P range with the shift operation unit and turning off the ignition, the parking lock device can be operated without any trouble by the hydraulic pressure accumulated in the accumulator 37.

  Further, the vehicle of the present embodiment can perform idling stop control. When the internal combustion engine stops at a temporary stop such as waiting for a signal, the pump stops and the line pressure disappears. During the idling stop control, the second ball valve 33B is closed, so that the hydraulic pressure accumulated in the accumulator 37 is held without leaking. In addition, as the line pressure disappears, the hydraulic pressure in the first unlocking oil chamber 30A and the second unlocking oil chamber 30B also disappears, but the parking lock is maintained in the unlocked state by the engagement of the detent plate 17 and the detent roller 22. Is done.

  Even if the internal combustion engine is started at the time of return from the idling stop control, the line pressure does not rise immediately, so that the hydraulic pressure cannot be supplied to the hydraulic brake 41 that is a hydraulic engagement device necessary for the start, and the quick start is hindered. There is a possibility that. However, according to the parking lock device of the present embodiment, the hydraulic brake 41 can be operated without delay by the hydraulic pressure of the accumulator 37 held during the idling stop control.

  More specifically, simultaneously with the return from the idling stop control, the hydraulic pressure accumulated in the accumulator 37 is supplied from the oil passage L2 to the oil passage L6. At this time, the solenoid valve 32D interposed in the oil passage L4 is opened by stopping the power supply, so the spool of the brake cut valve 43 has moved to the left in FIG. Therefore, by opening the linear solenoid valve 42 interposed in the oil passage L6 at a predetermined opening, the hydraulic pressure accumulated in the accumulator 37 can be supplied to the hydraulic brake 41, and the vehicle can be started quickly.

  In the above description, the operation of the hydraulic brake 41 at the time of return from the idling stop control has been described, but the hydraulic brake 41 is controlled by operating the brake cut valve 43 with the solenoid valve 32D even during normal traveling of the vehicle. be able to. When the solenoid valve 32D is closed to move the spool of the brake cut valve 43 to the left side of FIG. 3 to shut off the communication between the linear solenoid valve 42 and the hydraulic brake 41, the hydraulic pressure is supplied to the second unlocking oil chamber 30B. However, since the hydraulic pressure supplied to the first unlocking oil chamber 30A is held at the unlock position, there is no possibility that the parking lock will be activated.

  Further, according to the present embodiment, the solenoid valve 32A is also used for operating the lockup clutch 40a of the torque converter 40. That is, since the solenoid valve 32A is closed while the vehicle is running, the spool of the lockup clutch shift valve 39 moves to the right side in FIG. 3 and the lockup clutch pressure is supplied to the lockup clutch 40a of the torque converter 40. Is done. When the solenoid valve 32A is opened from this state, the spool of the lockup clutch shift valve 39 moves to the right side in FIG. 3 and the hydraulic pressure of the lockup clutch 40a is discharged, thereby disengaging the lockup clutch 40a. can do.

  When the solenoid valve 32A is opened, the line pressure is supplied to the first lock oil chamber 29A. At this time, the line pressure is applied to both the first unlock oil chamber 30A and the second unlock oil chamber 30B. Therefore, even if the line pressure is supplied to the first lock oil chamber 29A, the piston 27 does not move to the lock position, and there is no possibility that the parking lock is activated.

  As described above, according to the parking lock device of the present embodiment, the solenoid valve 32A and the solenoid valve 32D that control the operation of the piston 27 are used to control the lock-up clutch 40a of the torque converter 40 and the hydraulic brake 41, respectively. Since this is also used, the number of solenoid valves can be reduced to simplify the structure of the hydraulic circuit 31, and the accumulator 37 is used not only for the operation of the parking lock but also for hydraulic engagement when returning from the idling stop control. Since it is used for operating the hydraulic brake 41 which is a device, the number of accumulators can be reduced and the structure of the hydraulic circuit 31 can be further simplified.

  FIG. 4 shows a parking actuator valve composed of the hydraulic actuator 25 of the present embodiment. The cylinder 26 is disposed so as to extend in the vertical direction, and the piston 27 is slidable in the cylinder 26 in the vertical direction. The lower end of the cylinder 26 is closed by a closing portion 320 formed integrally with the cylinder 26. The upper end of the cylinder 26 is opened. A seat 314 and a cap body 312 are inserted into the upper end of the cylinder 26.

  The cap body 312 is liquid-tightly fixed to the cylinder 26 in order to prevent hydraulic fluid from leaking from the upper end of the cylinder 26. The seat 314 positions the cap body 312 and a notch 314a is formed between the seat 314 and the cap body 312 to form a gap for guiding the hydraulic pressure from the oil passage L3 to the first unlocking oil chamber 30A. Is provided. Further, the seat 314 prevents communication between the first unlocking oil chamber 30A and the second unlocking oil chamber 30B. In the present embodiment, the cap body 312 and the seat 314 constitute a parking cap 310.

  According to the parking actuator valve comprising the hydraulic actuator 25 of the present embodiment, the hydraulic pressure cannot be appropriately supplied to the first unlocking oil chamber 30A and the second unlocking oil chamber 30B due to a malfunction of the parking cap 310 or the like. Even so, the first lock oil chamber 29 </ b> A and the second lock oil chamber 29 </ b> B are provided on the closed portion 320 side formed integrally with the cylinder 26. Regardless of the defect such as a defect, the parking lock can be activated by appropriately moving the piston 27 to the parking lock position.

  Further, by releasing the hydraulic pressure of the first lock oil chamber 29A and the second lock oil chamber 29B, the piston 27 can be lowered downward in the cylinder 26 by its own weight, and the first unlock oil chamber Even when the hydraulic pressure cannot be properly supplied to 30A and the second unlocking oil chamber 30B, the parking lock can be released.

  As mentioned above, although embodiment of this invention was described, this invention can perform a various design change in the range which does not deviate from the summary.

  For example, the number of open / close valves (second solenoid valve and third solenoid valve) of the present invention is not limited to two, ie, the solenoid valve 32A and the solenoid valve 32B of the embodiment, and may be one or three or more. Good.

  The number of unlocking solenoid valves (first solenoid valves) is not limited to two, ie, the solenoid valve 32C and the solenoid valve 32D of the embodiment, and may be one or three or more.

  In this embodiment, the solenoid valve 32A is also used as a solenoid valve for supplying hydraulic pressure to the lock-up clutch 40a of the torque converter 40. The valve 32B) may also be used as a solenoid valve for supplying hydraulic pressure to the hydraulic engagement device. That is, the solenoid valve 32A or the solenoid valve 32B may be used as a solenoid valve that supplies hydraulic pressure to the starting mechanism or a solenoid valve that supplies hydraulic pressure to any of a plurality of hydraulic engagement devices.

  Moreover, it is not limited to the hydraulic brake 41 of embodiment, Other hydraulic engagement apparatuses, such as a hydraulic clutch, may be sufficient.

  Moreover, it is not limited to the torque converter 40 of embodiment, Other starting mechanisms, such as a starting clutch, may be sufficient.

  Further, in the present embodiment, the valve cap 310 is located at the upper end of the cylinder 26 and the closing portion 320 is located at the lower end of the cylinder 26.

  However, the parking actuator valve of the present invention is not limited to this. For example, the valve cap may be located at the lower end of the cylinder 26 and may include a closing portion integrally formed with the cylinder 26 at the upper end of the cylinder 26.

  Even with this configuration, by releasing the hydraulic pressure in the first lock oil chamber 29A and the second lock oil chamber 29B, the piston 27 can be lowered downward in the cylinder 26 by its own weight, and the first unlock Even when the hydraulic pressure cannot be properly supplied to the oil chamber 30A and the second unlocking oil chamber 30B, the effect of the present invention that the parking lock can be released can be achieved.

  In the present embodiment, the first lock oil chamber 29A and the second lock oil chamber 29B as parking lock oil chambers are positioned below the piston 27, and the first unlock as a parking release oil chamber. The oil chamber 30 </ b> A and the second unlocking oil chamber 30 </ b> B are located above the piston 27.

  However, the parking actuator valve of the present invention is not limited to this. For example, the first lock oil chamber 29A and the second lock oil chamber 29B as the parking lock oil chamber are positioned above the piston 27, and the first unlock oil chamber 30A and the second lock oil chamber 30A as the parking release oil chamber The two unlocking oil chambers 30 </ b> B may be positioned below the piston 27.

  Even with such a configuration, by releasing the first unlocking oil chamber 30 </ b> A and the second unlocking oil chamber 30 </ b> B, the piston 27 can be lowered downward in the cylinder 26 by its own weight. Even when the hydraulic pressure cannot be appropriately supplied to the hydraulic pressures of the first lock oil chamber 29A and the second lock oil chamber 29B located at the same position, the effect of the present invention that the parking lock can be operated can be achieved. .

11 Output shaft 12 Parking gear 12a Tooth groove 13 Support shaft 14 Parking pole 14a Locking claw 14b Cam follower 15 Spring 16 Support shaft 17 Detent plates 17a, 17b Recess 18 Parking rod 19 Pin 20 Cam 21 Arm 22 Detent roller 23 Spring 25 Hydraulic actuator 26 Cylinder 27 Piston 28 Pin 29A First lock oil chamber 29B Second lock oil chamber 30A First unlock oil chamber 30B Second unlock oil chamber 31 Hydraulic circuit 32A Solenoid valve 32B Solenoid valve 32C Solenoid valve 32D Solenoid Valve 37 Accumulator 40 Torque converter 40a Lock-up clutch 41 Hydraulic brake 112 Hydraulic cut valve 114 Cylinder 114a Input port 114b Output port 14c exhaust port 114d switching port 116 Spool 118 spring 122 first choke 132 first check valve 222 second choke 232 the second check valve 310 parking cap 312 cap body 314 sheet 314a notch 320 occlusion

Claims (4)

A parking cylinder,
A parking piston slidable in the parking cylinder;
A parking lock oil chamber to which hydraulic pressure for moving the parking piston to the parking lock position is supplied;
A parking release oil chamber to which hydraulic pressure for moving the parking piston to the parking release position is supplied, and
One end of the parking cylinder includes a closing portion formed integrally with the parking cylinder,
A valve cap for closing the other end of the parking cylinder is provided at the other end of the parking cylinder.
The parking release oil chamber is located on the side where the valve cap is provided.
A parking actuator oil valve, wherein the parking lock oil chamber is disposed on a side of the parking cylinder where the closed portion is provided. The parking actuator valve according to claim 1,
The parking cylinder extends in the vertical direction,
The parking actuator valve, wherein the parking lock oil chamber is located below the parking piston. A parking cylinder,
A parking piston slidable in the parking cylinder;
Parking lock oil chamber,
A parking release oil chamber,
The parking piston can be switched between a parking lock position and a parking release position.
The parking cylinder extends vertically,
The parking actuator oil valve is characterized in that the parking lock oil chamber is located below the parking piston. A parking cylinder,
A parking piston slidable in the parking cylinder;
Parking lock oil chamber,
A parking release oil chamber,
The parking piston can be switched between a parking lock position and a parking release position.
The parking cylinder extends vertically,
A parking actuator valve, wherein the parking release oil chamber is located below the parking piston.