JP2014196771A - Hydraulic control device of parking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic control device of a parking device which can hold the parking device in a parking-possible state even if an oil pump is driven when a stick is generated at, for example, a parking switch valve.SOLUTION: A spool 32p of a parking switch valve 32 is formed so that an interval d4 between a first land part 32p1 and a second land part 32p2 becomes longer than an interval d3 between an end of a discharge port EX side of an input port 32b and an end of the input port 32b side of the discharge port EX. When the spool 32p is stuck due to the clogging of foreign matters during the movement of the second land part 32p2 to a direction in which the input port 32b is blocked, working oil from the input port 32b and an output port 32d is discharged to the discharge port EX.

Description

  The present invention relates to a hydraulic control device for a parking device mounted on a vehicle, for example, and more specifically, a parking release state in which the engagement of the parking gear is released and a parking enabled state in which the parking gear can be engaged are switched by hydraulic pressure. The present invention relates to a hydraulic control device for a parking device.

  In recent years, a hydraulic control device incorporating a so-called shift-by-wire system that engages / releases a parking gear by setting hydraulic pressure according to an electrical command, in contrast to a parking device having a parking cylinder that drives and controls the engagement / release of the parking gear. When the parking release pressure is supplied from the parking switch valve to the parking cylinder, the parking gear is engaged, and the parking gear is engaged when the parking release pressure is not supplied from the parking switch valve to the parking cylinder. The thing of the structure switched to the parking possible state is proposed (for example, refer patent document 1).

  In the hydraulic control apparatus described in Patent Document 1, the spool includes a first land portion capable of shielding the discharge port and a second land portion capable of shielding the input port. When supplying the parking release pressure to bring the parking device into the parking release state, the spool moves to one side, the first land portion shields the discharge port, and the output port connects to the parking cylinder of the parking device. When the parking release pressure is not supplied so that the parking device can be parked, the spool moves to the other side, and the input port is shielded by the second land portion. In addition, the output port communicates with the discharge port.

  Further, in the hydraulic control device described in Patent Document 1, by providing a spring that biases the spool to the other side, when all the hydraulic pressure is turned off due to engine stop, the spool is moved by the biasing force of the spring. The parking release pressure is not supplied to the parking device by moving to the other side.

JP 2010-84872 A

  However, in the hydraulic control device described in Patent Document 1, when the parking switching pressure is not supplied in the parking switching valve so as to change from the parking release state to the parking enabled state during parking, the spool is moved from one side to the other. The second land portion shields the input port, but if a foreign object or the like bites into these gaps while the second land portion shields the input port, the input port slightly opens. In some cases, the spool may stick (fix).

  In this case, since the discharge port remains shielded by the first land portion, the hydraulic oil flows backward from the output port to the input port when the line pressure supply to the input port is interrupted when the engine is stopped after parking. For example, when the engine is started next time, the line pressure supplied to the input port is supplied from the output port to the parking device as the parking release pressure. Otherwise, the parking could be canceled.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hydraulic control device for a parking device that can hold the parking device in a parking enabled state even when the engine is started, for example, when a stick is generated by a parking switching valve. Is.

The present invention according to claim 1 (see, for example, FIGS. 1 and 2) provides a parking switching valve for a parking device (9) having a parking cylinder (33) for drivingly controlling the engagement / release of the parking gear (21). When the parking release pressure is supplied from (32) to the parking cylinder (33), the parking gear (21) is switched to the parking release state in which the meshing is released, and the parking cylinder (33) is switched from the parking switch valve (32). The parking controller hydraulic control device (20) switches to a parking enabled state in which the parking gear (21) can mesh when the parking release pressure is not supplied to
The parking switching valve (32)
A spool (32p) in which a first land portion (32p1) and a second land portion (32p2) are formed at predetermined intervals;
A biasing member (32s) for biasing the spool (32p) toward one side (X1);
A control oil chamber (32a) for pressing the spool (32p) against the biasing force of the biasing member (32s) toward the other side (X2),
An output port (32d) capable of outputting the parking release pressure to the parking cylinder;
The hydraulic pressure generated by driving the oil pump is input, and the spool (32p) is shielded by the second land portion (32p2) while the spool (32p) is moved to the one (X1) side, and the spool (32p) is An input port (32b) communicating with the output port (32d) in a state of moving to the (X2) side;
The spool (32p) communicates with the output port (32d) in a state where the spool (32p) is moved toward the one (X1) side, and the first land portion (when the spool (32p) is moved toward the other (X2) side) A discharge port (EX) shielded by 32p1),
The spool (32p) has an interval (d4) between the first land portion (32p1) and the second land portion (32p2) such that the input port (32b) has an end on the discharge port (EX) side. The discharge port (EX) is formed to be longer than the distance (d3) from the end on the input port (32b) side.
The present invention resides in a hydraulic control device for a parking device.

The present invention according to claim 2 (see, for example, FIG. 2) is provided with a throttle portion (34) in the oil passage (a3) on the upstream side of the input port (32b).
In the hydraulic control device of the parking device according to claim 1.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, in the spool of the parking switching valve, the distance between the first land portion and the second land portion is such that the end portion on the discharge port side of the input port and the end portion on the input port side of the discharge port. Since it is formed to be longer than the distance from the part, even if the spool sticks when the second land part moves in the direction of shielding the input port due to foreign matter, etc., the operation from the input port and output port Since oil can be discharged to the discharge port, for example, even if the oil pump is driven and hydraulic pressure is supplied to the input port as the engine starts, parking release pressure is supplied from the output port to the parking device. The parking device can be held in a state where parking is possible. Therefore, for example, even when the oil pump is driven when a stick is generated in the parking switching valve, the parking device can be held in a parking enabled state.

  According to the second aspect of the present invention, since the throttle portion is provided in the oil passage on the upstream side of the input port, the flow rate of the hydraulic oil flowing from the input port is restricted. Therefore, in order to prevent the parking release pressure from being generated at the output port 32d when the spool sticks, the clearance between the discharge port EX and the first land portion 32p1 is set large so that the entire length of the spool 32p is useless. It is possible to prevent the increase. Furthermore, since the flow rate of the hydraulic oil supplied to valves other than the parking switching valve can be ensured, a decrease in the hydraulic oil pressure can be suppressed.

The perspective view which shows the parking apparatus which concerns on embodiment of this invention. 1 is a cross-sectional view showing a hydraulic control device according to an embodiment of the present invention.

  Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. In addition, the parking apparatus demonstrated below can latch the output shaft of a vehicle so that rotation is impossible. The vehicle may be any of a vehicle having an engine as a drive source, a hybrid vehicle having an engine and a rotating electrical machine as a drive source, or an electric vehicle having only a rotating electrical machine as a drive source.

  First, the outline of the parking apparatus of the present embodiment will be briefly described with reference to FIG. The parking device described below can lock the output shaft of the vehicle in a non-rotatable manner. As a vehicle on which the parking device is mounted, a vehicle having an engine as a drive source, an engine and a rotation Either a hybrid vehicle provided with an electric machine as a drive source or an electric vehicle provided with only a rotating electric machine as a drive source may be used.

  The parking device 9 includes a parking cylinder 33, a parking rod 23, a support 16, a parking pole 17, and a parking gear 21, and parking release pressure is supplied to the parking cylinder 33 from a valve body 22 constituting the hydraulic control device 20. Alternatively, the parking release state or the parking enabled state is formed by being not supplied.

  The parking cylinder 33 is connected to the valve body 22 via an oil passage n, and the parking rod 23 is disposed through the base end side so as to be movable in the axial direction.

  A piston 25 is fixed to a portion of the parking rod 23 in the parking cylinder 33, and the hydraulic oil flowing into the parking cylinder 33 through the oil passage n presses one surface of the piston 25, whereby the parking rod 23 moves to the base end side.

  In the parking cylinder 33, a spring 26 is disposed so as to bias the other surface of the piston 25. When the hydraulic oil does not act on one surface of the piston 25, the parking rod 23 is urged by the spring 26 and moves to the tip side.

  The parking rod 23 includes a conical wedge 24 that is loosely fitted so as to be freely movable in the axial direction on the distal end side thereof, and between the collar 14 fixed to the parking rod 23 and the wedge 24, A spring 15 that urges the wedge 24 between the parking pole 17 and the support 16 is disposed.

  The support 16 is disposed below the front end side of the parking rod 23, and is disposed so that the wedge 24 is inserted into and removed from the parking pole 17.

  The parking pole 17 is disposed so as to be swingable in a substantially vertical direction around a shaft 18 on the base end side, and a parking gear fixed to an output shaft (not shown) of the vehicle is located above the intermediate portion. A claw portion 19 that can be engaged and disengaged with respect to 21 is projected.

  When the hydraulic pressure acts on the parking cylinder 33 as the parking release pressure via the oil passage n from the output port 32d of the parking switching valve 32 shown in FIG. Against the urging force, the wedge 24 is moved away from the space between the support 16 and the parking pole 17, and the parking pole 17 is swung downward to move the pawl portion 19 to the parking gear. The parking release state is established by removing the engagement with 21. In this parking release state, the engagement between the claw portion 19 and the parking gear 21 is released, so that the parking gear 21 and the output shaft of the vehicle provided with the parking gear 21 can rotate.

  In the parking device 9, when the hydraulic pressure from the parking switching valve 32 is cut off and the hydraulic pressure acting on the parking cylinder 33 is discharged to the parking switching valve 32 side via the oil passage n, the parking rod 23 moves the spring 26. The urging force moves to the parking pole 17 side, the wedge 24 is inserted between the support 16 and the parking pole 17, and the parking pole 17 swings upward to engage the pawl portion 19 with the parking gear 21. Due to this, parking is possible. In this parking enabled state, the claw portion 19 and the parking gear 21 are engaged with each other, so that the rotation of the parking gear 21 and the output shaft of the vehicle provided with the parking gear 21 is prevented.

  Next, the hydraulic control device 20 according to the present invention will be described with reference to FIG. 2A shows the state of the hydraulic control device 20 when the parking switching valve 32 does not output the parking release pressure, and FIG. 2C shows the parking switching valve 32 that outputs the parking release pressure. FIG. 2 (b) shows the state of the hydraulic control device 20 when the spool 32p of the parking switching valve 32 is stuck.

  The hydraulic control device 20 mainly includes a strainer (not shown) for regulating and generating hydraulic pressure that is various source pressures, an oil pump, a primary regulator valve, a secondary regulator valve, a solenoid modulator valve, a linear solenoid valve, and the like. ing. In the present embodiment, the oil pump and the primary regulator valve are combined and shown as a line pressure generating source 5 that generates the line pressure PL.

  An oil pump (not shown) is rotationally connected to the pump impeller of the torque converter, for example, and is driven in conjunction with the start of the engine when the ignition is turned on, and from an oil pan (not shown) via a strainer (not shown). Oil pressure is generated by sucking up oil.

  Note that the hybrid vehicle and the idle stop vehicle preferably include an electric oil pump that auxiliaryly generates hydraulic pressure independently of the engine. In this case, even if the ignition is on and the engine is not started, hydraulic pressure such as line pressure is generated by driving the electric oil pump.

  The primary regulator valve (not shown) partially discharges the hydraulic pressure generated by the oil pump based on the signal pressure of a linear solenoid valve (not shown) that is input to the spool loaded with the urging force of the spring. Adjust pressure. The line pressure PL is supplied to the parking switching valve 32 described above.

  The hydraulic control device 20 is connected so that an electric signal from the control unit 6 based on a shift lever or a button (not shown) of the driver is input. Further, the hydraulic control device 20 includes a first solenoid valve S1 and a second solenoid valve S2 for electrically controlling and supplying the hydraulic pressure. Further, the hydraulic control device 20 includes a parking switching valve 32 and a parking cylinder 33.

  It should be noted that the first solenoid valve S1 and the second solenoid valve S2 in the hydraulic control apparatus 20 shut off the input port and the output port (not shown) of these solenoid valves when not energized (hereinafter also referred to as “off”). In addition, a so-called normally closed (N / C) type that communicates when energized (hereinafter also referred to as “on”) is used.

  The first and second solenoid valves (ON / OFF solenoids) S1, S2 of the normally closed (N / C) type are energized (turned on) because the line pressure PL is inputted to an input port (not shown). At this time, signal pressures PS1 and PS2 are output to the first and second control oil chambers 32a and 32c of the parking switching valve 32 via the oil passages a1 and a2, respectively.

  The line pressure PL is also input to an input port 32b (described later) of the parking switching valve 32 through the oil passage a3. The first and second solenoid valves S1 and S2 and their signal pressures PS1 and PS2 will be described using the same symbols S1 and S2 as described above.

  The parking switching valve 32 has one spool 32p and a spring 32s as a biasing member that is contracted to one end of the spool 32p and biases the spool 32p to the arrow X1 side (one side). doing.

  Further, the parking switching valve 32 is disposed at the end of the spool 32p on the arrow X1 side, the first control oil chamber 32a on which the signal pressure PS1 from the first solenoid valve S1 acts, and the arrow X2 side of the spool 32p ( And a second control oil chamber 32c on which the signal pressure PS2 from the second solenoid valve S2 is applied. When the signal pressure PS1 from the first solenoid valve S1 is applied to the first control oil chamber 32a, the spool 32p is pressed toward the arrow X2, and the signal pressure PS2 from the second solenoid valve S2 is applied to the second control oil chamber 32c. When acted, the spool 32p is pressed to the arrow X1 side.

  The spool 32p includes a first land portion 32p1 having a small diameter on the upper side in the drawing, a second land portion 32p2 having a large diameter on the lower side in the drawing, and a space between the first land portion 32p1 and the second land portion 32p2. It has a constricted portion 32p3 formed. That is, the first land portion 32p1 and the second land portion 32p2 are arranged at a predetermined interval via a constricted portion 32p3 interposed therebetween. An annular space around the constricted portion 32p3 between the first land portion 32p1 and the second land portion 32p2 communicates with an input port 32b and an output port 32d, which will be described later, depending on the position of the spool 32p, or the discharge port EX. And an output port 32d.

  Here, the valve body 22 of the hydraulic control device 20 includes a discharge port EX through which hydraulic oil is discharged, an input port 32b through which the line pressure PL is supplied, and a discharge port EX or an input port according to the movement of the spool 32p. An output port 32d communicated with any one of 32b is formed. The output port 32d communicates with a parking cylinder 33 of the parking device via an oil passage n.

  Specifically, the valve body 22 of the hydraulic control device 20 inputs the output port 32d that can output the parking release pressure to the parking cylinder 33 via the oil passage n, and the line pressure PL, and the spool 32p is indicated by the arrow X1. The input port 32b that is shielded by the second land portion 32p2 in the state of FIG. 2A moved to the side and communicated with the output port 32d in the state of FIG. 2C in which the spool 32p has moved to the arrow X2 side; The spool 32p communicates with the output port 32d in the state shown in FIG. 2A in which the spool 32p has moved to the arrow X1 side, and the first land portion 32p1 in the state in FIG. 2C in which the spool 32p has moved to the arrow X2 side. A discharge port EX that is shielded.

  The spool 32p is at the position shown in FIG. 2C where the signal pressure PS1 from the first solenoid valve S1 has acted on the first control oil chamber 32a and moved downward against the urging force of the spring 32s. When the line pressure PL inputted from the input port 32b is applied to the constricted portion 32p3, the spool 32p is caused by the difference in outer diameter between the first land portion 32p1 and the second land portion 32p2, that is, the difference in pressure receiving area. Is configured to be biased and locked in a direction opposite to the biasing direction of the spring 32s, that is, in the direction of the arrow X2, with a force stronger than the biasing force of the spring 32s.

  In the state where the signal pressure PS1 from the first solenoid valve S1 does not act on the first control oil chamber 32a, the parking switch valve 32 is moved by the arrow X1 by the biasing force of the spring 32s as shown in FIG. And the output from the output port 32d to the parking cylinder 33 is shut off.

  In the parking switching valve 32, the signal pressure PS2 from the second solenoid valve S2 does not act on the second control oil chamber 32c, and the signal pressure PS1 from the first solenoid valve S1 is input to the first control oil chamber 32a. In a state where the signal pressure PS2 does not act on the second control oil chamber 32c and the line pressure PL continues to act on the input port 32b (locked state), the spool 32p is shown in FIG. As shown in (c), the line pressure PL is moved to the arrow X2 side, and the line pressure PL input to the input port 32b is supplied from the output port 32d to the parking cylinder 33 through the oil passage n as the parking release pressure.

  The operation of the hydraulic control device 20 as described above will be described. When the shift lever is operated to the P range, or when a parking operation is performed by a parking button or the like, an electric signal based on this operation is input from the control unit 6 to the hydraulic control device 20.

  Then, the first solenoid valve S1 is turned off by the control of the control unit 6 and the signal pressure PS1 is not output from the first solenoid valve S1, and the second solenoid valve S2 is turned on by the control of the control unit 6 and the second solenoid valve S1 is turned on. A signal pressure PS2 is output from the solenoid valve S2.

  Thereby, in the parking switching valve 32, the signal pressure PS1 does not act on the first control oil chamber 32a, and the signal pressure PS2 acts on the second control oil chamber 32c, so that the spool is coupled with the urging force of the spring 32s. 32p becomes the position shown in FIG. 2A, and the input of the line pressure PL to the input port 32b is cut off.

  For this reason, since the hydraulic pressure from the parking switching valve 32 to the parking cylinder 33 is cut off, the parking device 9 moves the piston 25 and the parking rod 23 toward the parking pole 17 by the urging force of the spring 26, thereby reducing the wedge. 24 is inserted between the support 16 and the parking pole 17 so that the pawl portion 19 can be engaged with the parking gear 21 in a parking enabled state.

  At this time, the hydraulic oil in the parking cylinder 33 is pushed back to the output port 32d of the parking switching valve 32 via the oil passage n as the piston 25 moves to the parking pole 17 side, and is drained from the discharge port EX. .

  In the above-described parking enabled state, when the parking rod 23 moves to the parking pole 17 side by the urging force of the spring 26, if the claw portion 19 does not mesh with the parking gear 21, a so-called park waiting state is entered. When the parking gear 21 rotates with the movement of the vehicle from this state, the pawl portion 19 meshes with the parking gear 21 so that the parking state is entered. The parking available state is a general term for a park waiting state and a park entering state.

  On the other hand, when the shift lever is operated in a range other than P, that is, in the R, N, D range, or when a parking release operation is performed by a parking button or the like, an electric signal based on this operation is sent from the control unit 6. Input to the hydraulic control device 20.

  Then, the first solenoid valve S1 is turned on under the control of the control unit 6, and the signal pressure PS1 is output from the first solenoid valve S1. Thereby, in the parking switching valve 32, the signal pressure PS1 acts on the first control oil chamber 32a, so that the spool 32p is in the position shown in FIG. 2C against the urging force of the spring 32s, and the input port 32b is connected. The line pressure PL is output as the parking release pressure from the output port 32d.

  For this reason, since the parking release pressure is supplied to the parking cylinder 33, in the parking device 9, the piston 25 and the parking rod 23 move toward the parking cylinder 33 against the urging force of the spring 26 to support the wedge 24. And the parking pole 17 are removed, and the claw portion 19 is disengaged from the parking gear 21 to release the parking state. The parking switching valve 32 in which the spool 32p is in the position shown in FIG. 2C is locked in the position shown in FIG. 2C due to the difference in pressure receiving area between the first land portion 32p1 and the second land portion 32p2. .

  Next, the main part of the present invention will be described in detail. In the present embodiment, as shown in FIG. 2B, the spool 32p of the parking switching valve 32 has an interval d4 between the first land portion 32p1 and the second land portion 32p2 that is on the discharge port EX side of the input port 32b. And an interval d3 between the end of the discharge port EX and the end of the discharge port EX on the input port 32b side.

  Here, when the parking device 9 switches from the parking release state to the parking enabled state, the spool 32p of the parking switching valve 32 changes from the state on the arrow X2 side as shown in FIG. 2C to the state shown in FIG. To the state on the arrow X1 side.

  During this movement, the spool 32p of the parking switching valve 32 is located between the input port 32b and the second land portion 32p2 when the second land portion 32p2 straddles the input port 32b as shown in FIG. There may be a case where a foreign substance or the like is sandwiched between the sticks (sticking) with a slight gap d2 between them.

  In this case, in the present embodiment, since the interval d4 is formed to be longer than the interval d3, a gap d1 is also formed between the discharge port EX and the first land portion 32p1. That is, the input port 32b and the discharge port EX communicate with each other through the gap d2 and the gap d1, and both the input port 32b and the output port 32d communicate with the discharge port EX.

  Thus, when the spool 32p sticks in the parking switching valve 32, the line pressure PL input from the input port 32b and the hydraulic pressure of the output port 32d are discharged to the discharge port EX. No parking release pressure is supplied to the parking cylinder 33, and the parking device 9 is in a parking enabled state. This parking enabled state is maintained even when the line pressure PL is not supplied to the input port 32b of the parking switching valve 32 due to the engine stop of the vehicle, and the input port 32b of the parking switching valve 32 is restarted next time. Even when the line pressure PL is input, the line pressure PL is discharged from the discharge port EX and is maintained.

  The gap d1 and the gap d2 are temporarily formed when the spool 32p is moved even during normal operation when the spool 32p is not sticking, but each gap is set to a slight gap amount and is temporarily formed. Therefore, the hydraulic pressure switching of the parking switching valve 32 is not affected during normal operation when the spool 32p is not sticking.

  In the present embodiment, the oil passage a3 on the upstream side of the input port 32b is provided with an orifice 34 as a throttle portion that regulates the amount of hydraulic oil flowing from the line pressure generating source 5 into the input port 32b. Yes.

  The orifice 34 regulates the flow rate of the hydraulic oil flowing into the input port 32b with the line pressure PL, so that the spool 32p sticks and both the input port 32b and the output port 32d are connected as shown in FIG. In a state where the exhaust port EX communicates with the discharge port EX, the line pressure PL from the input port 32b is prevented from acting as a parking release pressure on the output port 32d.

  That is, when the orifice 34 is not provided, when the spool 32p sticks, the sum of the amount of hydraulic oil flowing in from the input port 32b and the amount of hydraulic fluid flowing back from the output port 32d is discharged from the discharge port EX. It is necessary to set the gap d1 between the discharge port EX and the first land portion 32p1 large so as not to exceed the amount of hydraulic oil to be discharged. In this case, in order to increase the gap d1, the first land portion 32p1 If the distance d4 between the second land portion 32p2 and the second land portion 32p2 is set large, the total length of the spool 32p may be increased.

  In the present embodiment, the orifice 34 is provided on the upstream side of the input port 32b, so that the amount of hydraulic oil flowing into the input port 32b is regulated, so the gap d1 between the discharge port EX and the first land portion 32p1. Even if it is not set to be large, it is possible to suppress the occurrence of parking release pressure at the output port 32d.

  As described above, according to the present embodiment, the spool 32p of the parking switching valve 32 has an interval d4 between the first land portion 32p1 and the second land portion 32p2 that is equal to the end of the input port 32b on the discharge port EX side. Since the discharge port EX is formed so as to be longer than the distance d3 between the end of the discharge port EX and the input port 32b, the second land portion 32p2 is spooled by foreign matter or the like while moving in a direction to shield the input port 32b. When 32p sticks, for example, even if the engine is started and the line pressure PL is generated, the hydraulic oil from the input port 32b and the output port 32d can be discharged to the discharge port EX.

  For this reason, the parking release pressure is not supplied from the output port 32d to the parking cylinder 33 of the parking device 9, and the parking device 9 can be held in the parking enabled state. Therefore, for example, even when the oil pump is driven when a stick is generated in the parking switching valve 32, the parking device 9 can be held in a parking enabled state.

  Further, according to the present embodiment, since the amount of hydraulic fluid flowing into the input port 32b is regulated by providing the orifice 34 on the upstream side of the input port 32b, a parking release pressure is generated at the output port 32d. In order to suppress this, the gap between the discharge port EX and the first land portion 32p1 can be set large to prevent the entire length of the spool 32p from being unnecessarily increased.

  In the above embodiment, when the parking device 9 switches from the parking release state to the parking enabled state, the spool 32p of the parking switching valve 32 has a foreign object or the like between the input port 32b and the second land portion 32p2. However, the present invention has an advantageous effect even when the spool 32p of the parking switching valve 32 sticks when the parking device 9 attempts to switch from the parking enabled state to the parking released state. Play.

  That is, the spool 32p of the parking switching valve 32 is changed from the state on the arrow X1 side as shown in FIG. 2 (a) to the state shown in FIG. 2 (c) when the parking device 9 attempts to switch from the parking available state to the parking released state. Move to the state on the arrow X2 side.

  During this movement, the spool 32p of the parking switching valve 32 is located between the discharge port EX and the first land portion 32p1 when the first land portion 32p1 straddles the discharge port EX as shown in FIG. There may be a case in which a foreign object or the like is sandwiched between the sticks and a stick is made with a slight gap d1 between them.

  Also in this case, since the gap d4 is formed to be longer than the gap d3, a gap d2 is formed between the input port 32b and the first land portion 32p1 similarly to the above description. Both the input port 32b and the output port 32d communicate with the discharge port EX.

  Therefore, since the parking device 9 remains in the parking enabled state without switching to the parking released state, the parking device 9 clearly and quickly grasps the state in which the vehicle cannot travel without switching to the parking released state and takes appropriate measures. It becomes possible.

9 Parking device 20 Hydraulic control device for parking device (hydraulic control device)
21 Parking gear 32 Parking switching valve 32a Control oil chamber (first control oil chamber)
32b Input port 32d Output port 32p Spool 32p1 First land portion 32p2 Second land portion 32s Biasing member (spring)
33 Parking cylinder 34 Restriction part (orifice)
a3 Oil passage EX discharge port

Claims (2)

When a parking release pressure is supplied to the parking cylinder from a parking switching valve to a parking device having a parking cylinder that drives and controls the engagement / release of the parking gear, the parking gear is switched to a parking release state in which the engagement of the parking gear is released. A parking device hydraulic control device for switching to a parking enabled state in which the parking gear can be engaged when parking release pressure is not supplied from the parking switching valve to the parking cylinder,
The parking switching valve is
A spool in which the first land portion and the second land portion are formed at a predetermined interval;
A biasing member that biases the spool to one side;
A control oil chamber that presses the spool against the biasing force of the biasing member to the other side,
An output port capable of outputting the parking release pressure to the parking cylinder;
Oil pressure generated by driving an oil pump is input, and the spool is shielded by the second land portion in a state where the spool is moved to the one side, and communicated with the output port in a state where the spool is moved to the other side. An input port;
A discharge port that communicates with the output port in a state in which the spool is moved to the one side and is shielded by the first land portion in a state in which the spool is moved to the other side;
In the spool, an interval between the first land portion and the second land portion is longer than an interval between an end portion of the input port on the discharge port side and an end portion of the discharge port on the input port side. Formed,
A hydraulic control device for a parking device. An oil passage on the upstream side of the input port has a throttle portion.
The hydraulic control apparatus for a parking apparatus according to claim 1.

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