JP2018096480A - Liquid pressure control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid pressure control device which allows the size reduction of an electromagnetic valve for supplying liquid pressure accumulated in an accumulator to a liquid pressure operation part.SOLUTION: A liquid pressure control device 100 has: an accumulator 1 for accumulating liquid pressure; a circulation flow passage 22 which connects a middle portion of a discharge liquid supply flow passage 21 for connecting a pump 11 and a liquid pressure operation part 13, and the accumulator 1; a mechanical block valve 2 which is arranged in the middle portion of the circulation flow passage 22, blocks the circulation flow passage 22 when back pressure is inputted, and releases the circulation flow passage 22 when the back pressure is not inputted; an electromagnetic selector valve 3 which switches a first state for inputting line pressure being pressure in the discharge liquid supply flow passage 21 to the block valve 2 as the back pressure, and a second state for releasing the back pressure which is inputted to the block valve 2; a charging flow passage 2b5 for supplying the line pressure of the discharge liquid supply flow passage 21 to the accumulator 1; and an orifice 2b4 arranged at the changing flow passage 2b5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid pressure control device.

  In order to improve fuel efficiency, there are vehicles having an idling stop function that stops the engine when the vehicle is stopped with the ignition turned on. In this vehicle, the engine is restarted when a driver's intention to restart is detected, such as when the brake pedal is released while the engine is stopped with the ignition turned on. In a vehicle in which a pump for supplying a liquid pressure to a fluid pressure operating part such as a clutch of an automatic transmission is driven by an engine, the line pressure between the pump and the fluid pressure operating part is zero when the engine is stopped. For this reason, since the line pressure increased after the engine was restarted, it took time for the liquid pressure to be supplied to the liquid pressure actuating part, and the restart of the vehicle was delayed.

  Therefore, as disclosed in Patent Document 1, a liquid pressure control device has been proposed that supplies liquid accumulated in an accumulator to a liquid pressure operating unit when the engine is restarted. This liquid pressure control device has a flow path for allowing the liquid stored in the accumulator to flow into a discharge liquid supply flow path from the pump to the liquid pressure clutch, and an electromagnetic valve for opening and closing the flow path. In the liquid pressure control device disclosed in Patent Document 1, when the vehicle restarts, the solenoid valve is opened, and the liquid pressure accumulated in the accumulator is supplied to the liquid pressure operating unit. Can be made.

JP 2000-313252 A

  In the liquid pressure control device disclosed in Patent Document 1, as the accumulator pressure accumulated in the accumulator increases, the operating force for moving the valve body against the accumulator pressure increases. For this reason, the solenoid valve provided with the solenoid which can generate a bigger operating force was needed, and the solenoid valve was enlarged.

  The present invention has been made to solve the above-described problems, and provides a liquid pressure control device capable of downsizing an electromagnetic valve for supplying liquid pressure accumulated in an accumulator to a liquid pressure operating unit. .

  In order to solve the above-mentioned problem, the invention of the liquid pressure control device according to claim 1 is a liquid pressure control device for controlling the liquid pressure supplied to a liquid pressure operation unit operated by the liquid pressure of the liquid, An accumulator that accumulates the liquid pressure, a pump that is driven by an engine to discharge the liquid, and a discharge liquid supply passage that connects the liquid pressure operation unit, and a valve body storage unit that is a space are formed inside. A cylinder, and a valve body that is movably provided in the valve body storage portion and divides the valve body storage portion into a front chamber and a back pressure chamber, and the cylinder communicates with the front chamber. A valve opening that is connected to the discharge liquid supply flow path and is opened and closed by the valve body, and an inflow port that communicates with the front chamber and is connected to the accumulator are formed to close the back pressure chamber. Back pressure is input In addition, when the valve port is closed by the valve body on which the back pressure acts, and the back pressure is not input to the back pressure chamber, the liquid pressure flowing from the accumulator to the front chamber acts. A mechanical closing valve whose valve opening is opened by the valve body, a back pressure channel connecting the back pressure chamber and the discharge liquid supply channel, and provided in the middle of the back pressure channel, An electromagnetic type electromagnetic switching valve that switches between a first state in which the discharge liquid supply flow path and the back pressure chamber are connected and a second state in which the back pressure chamber is opened, and the discharge liquid supply from the electromagnetic switching valve The liquid is provided in the back pressure flow path on the flow path side and allows the liquid to flow from the discharge liquid supply flow path side to the back pressure chamber side, but the liquid from the back pressure chamber side to the discharge liquid supply flow path side. A back pressure flow path check valve that does not permit the flow of liquid and the discharge liquid A filling flow path for supplying a line pressure, which is a pressure in the supply flow path, to the accumulator, and a line pressure action flow path side provided in the filling flow path, on which the line pressure is applied, from the accumulator side A fluid flow passage check valve that permits the fluid flow to the fluid but does not permit the fluid flow from the accumulator side to the line pressure acting flow channel side, and the liquid conduit that circulates through the fill flow channel An orifice for increasing resistance.

  As described above, the liquid pressure control device has a mechanical closing valve and an electromagnetic switching valve. The blocking valve closes the valve port when the back pressure is input to the back pressure chamber, and opens the valve port when the back pressure is not input to the back pressure chamber. The electromagnetic switching valve switches between a first state in which the discharge liquid supply flow path and the back pressure chamber are connected and a second state in which the back pressure input to the back pressure chamber is released. As a result, when the electromagnetic switching valve is in the first state, the line pressure of the discharge liquid supply flow path is input as a back pressure into the back pressure chamber, the valve opening is closed, and the liquid pressure is maintained in the accumulator. On the other hand, when the electromagnetic switching valve is in the second state, the back pressure input to the back pressure chamber is released, the valve port is opened, and the liquid pressure accumulated in the accumulator is supplied to the liquid pressure operating unit. be able to. Thus, the electromagnetic switching valve switches between the first state and the second state, and does not operate against the high-pressure liquid pressure accumulated in the accumulator. For this reason, since there is no need to generate a large operating force in the electromagnetic switching valve, the electromagnetic switching valve can be reduced in size.

It is explanatory drawing which shows the liquid pressure control apparatus of 1st embodiment of a state which has a valve body in a valve closing position. It is explanatory drawing which shows the liquid pressure control apparatus of 1st embodiment of a state which has a valve body in a valve opening position. It is the time chart which showed the relationship with a back pressure, an accumulator pressure, a line pressure, the operating state of a pump, and the state of an electromagnetic switching valve when only orifice filling is performed. It is the time chart which showed the relationship with the back pressure, the accumulator pressure, the line pressure, the operating state of a pump, and the state of an electromagnetic switching valve when orifice filling and rapid filling are executed. It is a flowchart of filling switching control. It is explanatory drawing which shows the liquid pressure control apparatus of 2nd embodiment.

(Liquid pressure control device of the first embodiment)
Below, the structure of the liquid pressure control apparatus 100 of 1st embodiment is demonstrated using FIG.1 and FIG.2. In the following description, the liquid pressure is the pressure of a liquid such as oil. As shown in FIG. 1, the liquid pressure control device 100 includes an accumulator 1, a closing valve 2, an electromagnetic switching valve 3, a control unit 4, a line pressure detection unit 5, a discharge liquid supply channel 21, a circulation channel 22, and a back pressure flow. A passage 23, a supply flow path check valve 25, and a back pressure flow path check valve 26 are provided. A vehicle V on which the liquid pressure control device 100 is mounted includes a pump 11, a liquid storage unit 12, a liquid pressure operation unit 13, and an engine 31. The liquid pressure control device 100 is a device that controls the liquid pressure supplied to the liquid pressure operating unit 13.

  Note that the vehicle V according to the present embodiment has an idling stop function in which the engine 31 stops when the vehicle is stopped with the ignition turned on. If the driver's intention to restart is detected, such as when the brake pedal (not shown) is released while the vehicle V is stopped with the ignition ON and the engine 31 is stopped, the engine 31 is detected. Restarts.

  The pump 11 is a mechanical pump such as a trochoid pump that is driven by the engine 31 and sucks and discharges a liquid such as oil from the liquid storage unit 12 and supplies the liquid to the liquid pressure operation unit 13. The liquid storage part 12 stores a liquid, for example, an oil pan of a transmission. The liquid pressure operation unit 13 is a mechanical element that is operated by liquid pressure such as a clutch or a brake of the transmission. The pump 11 and the liquid pressure operating unit 13 are connected by a discharge liquid supply channel 21.

  The accumulator 1 accumulates a liquid pressure as an accumulator pressure. The accumulator pressure is the pressure inside the housing 1a of the accumulator 1. The accumulator 1 has a housing 1a, a piston 1b that is movably attached to the housing 1a, and a spring 1c that urges the piston 1b in the direction opposite to the moving direction of the piston 1b when the accumulator 1 is accumulated. doing. The circulation channel 22 connects the accumulator 1 and the discharge liquid supply channel 21. The shut-off valve 2 is provided in the middle part of the circulation channel 22. In the following description, the discharge liquid supply flow channel 21 side of the flow channel 22 is defined as the first flow channel 22a, and the accumulator 1 side of the flow channel 22 is closed to the second flow channel 22a. Let it be a flow path 22b.

  The shutoff valve 2 is a mechanical valve composed of a cylinder 2a, a valve body 2b, a spring 2c, and a filling flow path check valve 2d. The cylinder 2a includes a cylindrical tube portion 2a1, a front wall portion 2a2 that closes an opening portion on the front end side of the tube portion 2a1, and a rear wall portion 2a3 that closes an opening portion on the rear end side of the tube portion 2a1. It is comprised and the valve body accommodating part 2a4 which is space is formed in the inside.

  The front wall 2a2 is formed with a valve port 2a5 communicating with the valve body housing 2a4 (front chamber 2a8). One end of the first circulation channel 22 a is connected to the valve port 2 a 5, and the other end of the first circulation channel 22 a is connected to the middle part of the discharge liquid supply channel 21. Thus, the valve port 2a5 is connected to the middle part of the discharge liquid supply channel 21 via the first circulation channel 22a. The valve port 2a5 is opened and closed by the valve body 2b.

  An inflow port 2a6 communicating with the valve body storage portion 2a4 (front chamber 2a8) is formed on the peripheral surface of the front end portion of the cylindrical portion 2a1. One end of the second circulation channel 22b is connected to the accumulator 1, and the other end of the second circulation channel 22b is connected to the inflow port 2a6 of the cylinder 2a. Thus, the inflow port 2a6 is connected to the accumulator 1 through the second circulation channel 22b. A back pressure port 2a7 communicating with the valve body storage portion 2a4 (back pressure chamber 2a9) is formed in the rear wall portion 2a3. The back pressure port 2a7 may be formed on the peripheral surface of the rear end portion of the cylindrical portion 2a1.

  The valve body 2b includes a tip portion 2b1 formed in a truncated cone shape having a conical surface 2b3, and a main body portion 2b2 formed in a columnar shape and coaxially with the tip portion 2b1 and integrally formed behind the tip portion 2b1. ing. The valve body 2b is housed in the valve body housing part 2a4 of the cylinder 2a so as to be movable in the front-rear direction with the tip 2b1 facing the valve port 2a5. The valve body 2b divides the valve body storage portion 2a4 into a front chamber 2a8 on the front side and a back pressure chamber 2a9 on the rear side. A back pressure, which is a pressure for closing the closing valve 2, flows into the back pressure chamber 2 a 9.

  The outer diameter of the main body portion 2b2 of the valve body 2b is slightly smaller than the inner diameter of the inner peripheral surface of the valve body storage portion 2a4, and the outer peripheral surface of the main body portion 2b2 and the inner peripheral surface of the valve body storage portion 2a4. The clearance between them is small. For this reason, almost no liquid leaks from the clearance between the outer peripheral surface of the main body 2b2 and the inner peripheral surface of the valve body storage portion 2a4, and the front chamber 2a8 and the back pressure chamber 2a9 are almost oil-tight. A ring-shaped flexible sealing member is provided on the outer peripheral surface of the main body 2b2 or the inner peripheral surface of the valve body storage portion 2a4, and the outer peripheral surface of the main body 2b2 and the inner peripheral surface of the valve body storage portion 2a4. There is no problem even if the structure does not allow liquid to leak from the clearance.

  A space between the conical surface 2b3 of the distal end portion 2b1 and the front end portion of the valve body storage portion 2a4 is a front chamber 2a8. The inflow port 2a6 communicates with the front chamber 2a8. A space between the rear end surface of the main body 2b2 and the inner surface of the valve body storage 2a4 is a back pressure chamber 2a9. The back pressure chamber 2a9 and the back pressure port 2a7 are in communication. The spring 2c is housed in the back pressure chamber 2a9 and urges the valve body 2b to the front side, that is, the valve port 2a5 side. As shown in FIG. 1, when the valve body 2b is in the valve closing position that is the front end side of the moving range, the valve port 2a5 is closed by the conical surface 2b3 of the tip 2b1, and the valve port 2a5 and the inflow port It is blocked from 2a6. On the other hand, when the valve body 2b is in a valve opening position other than the front end of the movement range, the valve port 2a5 and the inflow port 2a6 communicate with each other via the front chamber 2a8.

  A valve body inflow port 2b7 is formed on the rear end surface of the main body 2b2 of the valve body 2b. An orifice port 2b4 is formed on the side peripheral surface of the main body 2b2 of the valve body 2b. The orifice port 2b4 corresponds to the orifice described in the claims. The orifice port 2b4 communicates with the inflow port 2a6 of the cylinder 2a. The valve body 2b is formed with a filling flow path 2b5 that connects the valve body inflow port 2b7 and the orifice port 2b4. That is, the filling flow path 2b5 is formed in the valve body 2b so as to connect the back pressure chamber 2a9 and the inflow port 2a6. The orifice port 2b4 is provided at the end of the filling channel 2b5. The filling flow path 2 b 5 is a flow path for supplying the line pressure of the discharge liquid supply flow path 21 to the accumulator 1. The flow area of the orifice port 2b4 is set smaller than the flow areas of the filling flow path 2b5, the valve body inflow port 2b7, the inflow port 2a6, the discharge liquid supply flow path 21, the flow flow path 22, and the back pressure flow path 23. Squeezed. For this reason, the orifice port 2b4 increases the pipe resistance of the liquid flowing through the filling flow path 2b5.

  The filling flow path check valve 2d is provided in the filling flow path 2b5. The filling flow path check valve 2d includes a ball 2d1 and a check valve spring 2d2. The ball 2d1 is movably provided in the filling channel 2b5, and closes or opens the valve seat 2b6 that is an opening to the filling channel 2b5 of the valve body inflow port 2b7. The check valve spring 2d2 biases the ball 2d1 toward the valve seat 2b6. With such a configuration, the filling flow path check valve 2d allows the liquid to flow from the valve body inflow port 2b7 to the orifice port 2b4, but allows the liquid to flow from the orifice port 2b4 to the valve body inflow port 2b7. do not do. That is, the filling flow path check valve 2d allows the liquid to flow from the back pressure flow path 23 side where the line pressure is applied to the accumulator 1 side, but from the accumulator 1 side to the back pressure flow path 23 side. Liquid is not allowed to flow into. In the present embodiment, the back pressure channel 23 which is a channel on which the line pressure is applied corresponds to the line pressure acting channel described in the claims.

  The back pressure flow path 23 connects the back pressure port 2a7 and the liquid pressure operating section 13 side (downstream side) with respect to the connecting portion between the discharge liquid supply flow path 21 and the first flow path 22a. In other words, the back pressure channel 23 connects the back pressure chamber 2a9 and the discharge liquid supply channel 21 and is provided in parallel with the first flow channel 22a. The electromagnetic switching valve 3 is provided in the middle of the back pressure flow path 23. In the following description, the connection portion side of the back pressure channel 23 with respect to the discharge liquid supply channel 21 relative to the electromagnetic switching valve 3 is referred to as a first back pressure channel 23a, and the back pressure is higher than that of the electromagnetic switching valve 3 of the back pressure channel 23. The port 2a7 side is referred to as a second back pressure channel 23b.

  The electromagnetic switching valve 3 connects the discharge liquid supply passage 21 and the back pressure chamber 2a9, and inputs the line pressure, which is the pressure in the discharge liquid supply passage 21, to the back pressure chamber 2a9 of the closing valve 2. The first state to be switched and the second state to release the back pressure input to the back pressure chamber 2a9 of the blocking valve 2 are switched. The back pressure is the pressure inside the back pressure chamber 2a9. The electromagnetic switching valve 3 is an electromagnetic switching valve having a switching unit 3a such as a valve body and a spool, and a solenoid 3b that moves the switching unit 3a. The solenoid 3 b is connected to the control unit 4 and moves the switching unit 3 a based on the drive current (command) output from the control unit 4. In the OFF state in which the drive current is not supplied to the solenoid 3b, the electromagnetic switching valve 3 opens the back pressure flow path 23 by the switching unit 3a as shown in FIG. 1, and the line pressure becomes back pressure into the back pressure chamber 2a9. The first state is entered. On the other hand, in the ON state in which the drive current is supplied to the solenoid 3b, the electromagnetic switching valve 3 has the first back pressure channel 23a closed by the switching unit 3a and the second by the switching unit 3a, as shown in FIG. The back pressure flow path 23b is connected to the drain flow path 24, and the back pressure in the back pressure chamber 2a9 is released to the atmospheric pressure. The drain channel 24 is connected to the liquid storage unit 12.

  The supply flow path check valve 25 is provided in the discharge liquid supply flow path 21 between the connection portion between the discharge liquid supply flow path 21 and the first circulation flow path 22 a and the pump 11. The supply flow path check valve 25 is a liquid from the pump 11 to the liquid pressure operating unit 13 side or the flow path 22 (accumulator 1) side than the connection portion of the discharge liquid supply flow path 21 with the first flow path 22a. However, the flow of the liquid from the liquid pressure operating unit 13 side or the flow channel 22 (accumulator 1) side to the pump 11 side is not allowed.

  The back pressure channel check valve 26 is provided in the first back pressure channel 23a. The back pressure flow path check valve 26 circulates liquid from the discharge liquid supply flow path 21 (pump 11) side to the electromagnetic switching valve 3 (second back pressure flow path 23b, back pressure chamber 2a9, back pressure port 2a7) side. However, the flow of the liquid from the electromagnetic switching valve 3 side to the discharge liquid supply flow path 21 side is not allowed. As shown in FIG. 2, in the second state, the second back pressure channel 23b is connected to the drain channel 24 connected to the liquid reservoir 12, and the back pressure input to the back pressure chamber 2a9 is discharged. Thus, the back pressure chamber 2a9 becomes atmospheric pressure.

The line pressure detection unit 5 detects a line pressure that is a liquid pressure in the discharge liquid supply flow path 21 and outputs the detection result to the control unit 4.
The control unit 4 controls the electromagnetic switching valve 3 based on the line pressure of the discharge liquid supply passage 21 detected by the line pressure detection unit 5 to switch between orifice filling and rapid filling described later.
The orifice filling means that the control unit 4 turns off the electromagnetic switching valve 3 to set the flow path of the liquid pressure control device 100 to the first state, and the line pressure is changed to the filling flow path 2b5 and the orifice port 2b4. To supply to the accumulator 1. By accumulating the orifice, the accumulator 1 is gradually filled with the accumulator pressure.
The rapid filling means that the control unit 4 turns on the electromagnetic switching valve 3 to set the flow path of the liquid pressure control device 100 to the second state, and the line pressure is transferred to the accumulator 1 through the front chamber 2a8. Is to supply. The accumulator 1 is rapidly filled with the accumulator pressure by the rapid filling.
When the line pressure supplied to the liquid pressure operating unit 13 by the pump 11 has no margin, the control unit 4 selects orifice filling, and when the line pressure supplied to the liquid pressure operating unit 13 by the pump 11 has margin. For quick filling, it is possible to choose.

(Operation of the liquid pressure control apparatus of the first embodiment in which only orifice filling is executed)
Next, the operation of the liquid pressure control apparatus 100 according to the first embodiment in which only orifice filling is executed will be described with reference to FIGS.
Of the surface of the tip 2b1 of the valve body 2b, the portion facing the valve port 2a5 is a first pressure receiving surface F1 that receives the line pressure. The pressure receiving area of the first pressure receiving surface F1 is the foreshadow projection area of the portion of the surface of the tip 2b1 that faces the valve port 2a5. The rear end surface of the main body 2b2 of the valve body 2b is a second pressure receiving surface F2 that receives back pressure. The pressure receiving area of the second pressure receiving surface F2 is the area of the rear end surface of the main body 2b2. Of the surface of the tip 2b1 of the valve body 2b, the portion facing the front chamber 2a8 is a third pressure receiving surface F3 that receives the accumulator pressure. The pressure receiving area of the third pressure receiving surface F3 is a foreshadow projection area obtained by subtracting the contact area between the first pressure receiving surface F1 and the front end 2b1 and the front wall 2a2 from the surface area of the front end 2b1. The pressure receiving area of the second pressure receiving surface F2 is larger than the pressure receiving areas of the first pressure receiving surface F1 and the third pressure receiving surface F3.

  When the ignition is turned on and the engine 31 is driven (T0 in FIG. 3), the pump 11 is driven by the engine 31 and the line pressure rises from 0 (P1 in FIG. 3), and the line pressure is applied to the first pressure receiving surface F1. Act. Since the control unit 4 turns off the electromagnetic switching valve 3 and the back pressure channel 23 is opened by the electromagnetic switching valve 3, the control unit 4 enters the back pressure chamber 2a9 from the discharge liquid supply channel 21 via the back pressure channel 23. Liquid is supplied, the back pressure in the back pressure chamber 2a9 rises to the same pressure as the line pressure (P2 in FIG. 3), and the same back pressure as the line pressure acts in the back pressure chamber 2a9. Then, the back pressure in the back pressure chamber 2a9 acts on the ball 2d1, and the ball 2d1 moves away from the valve seat 2b6 against the urging force of the check valve spring 2d2. As a result, the liquid pressure is supplied to the accumulator 1 through the filling channel 2b5, the orifice port 2b4, the inflow port 2a6, and the second circulation channel 22b, and the accumulator pressure increases (P3 in FIG. 3).

  As described above, the flow path area of the orifice port 2b4 is set smaller than the flow path area of the discharge liquid supply flow path 21. Thereby, when the accumulator pressure is accumulated in the accumulator 1, the liquid flows into the accumulator 1 through the orifice port 2b4 having a small flow path area. For this reason, the back portion of the discharge liquid supply flow channel 21 on the liquid pressure operating unit 13 side of the connection portion 21a between the first back pressure flow channel 23a and the discharge liquid supply flow channel 21 is further away from the connection portion 21a. The pipe resistance of the flow path reaching the accumulator 1 via the pressure flow path 23, the filling flow path 2b5, and the second flow path 22b is larger. For this reason, the accumulator pressure gradually rises, and the degree of increase of the accumulator pressure per unit time becomes smaller than the degree of increase of the line pressure per unit time. As a result, the degree of increase of the line pressure per unit time is larger than when the accumulator pressure increases with the same degree of increase per unit time as the line pressure. As a result, a desired liquid pressure is quickly supplied by the liquid pressure operating unit 13, and a decrease in the flow rate of the liquid supplied from the discharge liquid supply channel 21 to the liquid pressure operating unit 13 is suppressed. Thereafter, the accumulator pressure gradually increases and becomes the same pressure as the line pressure (P4 in FIG. 3).

  In addition, if the piston 1b of the accumulator 1 is stroked to the maximum with accumulator pressure accumulation in the accumulator 1, thereafter, the degree of increase in the accumulator pressure becomes larger than before (P3-1 in FIG. 3). The accumulator pressure (P3-2 in FIG. 3) at the time when the piston 1b of the accumulator 1 is stroked to the maximum is the accumulator pressure held in the accumulator 1 when the pump 11 is stopped.

  When the engine 31 is stopped by the idling stop function (T1 in FIG. 3), the supply of the liquid from the pump 11 to the discharge liquid supply passage 21 is stopped, the liquid pressure is released from the liquid pressure operating unit 13, and the line pressure is reduced. 0 (P5 in FIG. 3), the liquid pressure does not act on the first pressure receiving surface F1. The back pressure channel check valve 26 prevents the liquid in the back pressure chamber 2a9 from flowing out to the discharge liquid supply channel 21 side, and the back pressure in the back pressure chamber 2a9 is maintained (P6 in FIG. 3). Further, the ball 2d1 is pressed against the valve seat 2b6 by the accumulator pressure and the urging force of the check valve spring 2d2, and the filling flow path check valve 2d is a flow path between the orifice port 2b4 and the valve body inflow port 2b7. The filling flow path 2b5 is closed. As a result, the accumulator pressure is maintained at the same pressure as the back pressure (P7 in FIG. 3).

  The accumulator pressure from the accumulator 1 acts on the third pressure receiving surface F3, but due to the area difference between the second pressure receiving surface F2 and the third pressure receiving surface F3, a force toward the valve port 2a5 acts on the valve body 2b. . In addition, since the valve body 2b is urged toward the valve port 2a5 by the spring 2c, the tip 2b1 of the valve body 2b is pressed against the opening of the valve port 2a5 as shown in FIG. The state where the body 2b is located at the valve closing position is maintained. Thereby, even after the engine is stopped, the opening of the valve port 2a5 is closed by the tip 2b1 of the valve body 2b, and the accumulator pressure accumulated in the accumulator 1 is maintained (P7 in FIG. 3).

  When the driver's intention to restart is detected, the control unit 4 starts restarting the engine 31, supplies a drive current to the electromagnetic switching valve 3, and turns on the electromagnetic switching valve 3 (FIG. 3). T2). Then, as shown in FIG. 2, the first back pressure channel 23 a and the second back pressure channel 23 b are blocked by the electromagnetic switching valve 3, and the second back pressure channel 23 b is connected to the drain channel 24. . In this state, the liquid in the back pressure chamber 2a9 flows through the second back pressure channel 23b and the drain channel 24 and is discharged to the liquid storage unit 12, and the back pressure in the back pressure chamber 2a9 is discharged. The back pressure chamber 2a9 becomes atmospheric pressure (P8 in FIG. 3). In this state, the liquid pressure does not act on the second pressure receiving surface F2, while the accumulator pressure flows into the front chamber 2a8 from the accumulator 1, and the accumulator pressure (liquid pressure) acts on the third pressure receiving surface F3 of the valve body 2b. To do. Therefore, as shown in FIG. 2, the valve body 2b moves rearward against the spring 2c and moves to the valve opening position, the valve port 2a5 is opened, and the valve port 2a5 and the inflow port 2a6 are moved forward. It communicates via the chamber 2a8.

  Then, the liquid pressure is supplied from the accumulator 1 to the discharge liquid supply passage 21 via the inflow port 2a6, the front chamber 2a8, the valve port 2a5, and the flow passage 22, and the line pressure increases (in FIG. 3). P9), the line pressure is supplied to the liquid pressure operating unit 13. For this reason, the line pressure is supplied to the liquid pressure operating unit 13 earlier when the engine 31 is restarted, and the vehicle V can quickly restart compared to a vehicle in which the liquid pressure control device 100 is not mounted. .

  When the liquid pressure is supplied from the accumulator 1 to the discharge liquid supply channel 21, the supply channel check valve 25 prevents the liquid from flowing from the discharge liquid supply channel 21 to the pump 11 side. . For this reason, the liquid pressure supplied from the accumulator 1 to the discharge liquid supply channel 21 does not escape to the pump 11 side.

  Thereafter, the control unit 4 stops the supply of the drive current to the electromagnetic switching valve 3 to turn off the electromagnetic switching valve 3 (T3 in FIG. 3), and the liquid pressure control device 100 is in the first state shown in FIG. And Then, along with the operation of the pump 11, the line pressure and the back pressure increase (P10 and P11 in FIG. 3), and the accumulator pressure also increases (P12 in FIG. 3). As described above, the flow path area of the orifice port 2b4 is set to be smaller than the flow path areas of the discharge liquid supply flow path 21 and the back pressure flow path 23, so that the accumulator pressure is increased by the line pressure and the back pressure. It rises with a moderate rise degree compared to (P12 in FIG. 3).

(Operation of Liquid Pressure Control Device of First Embodiment in which Orifice Filling and Rapid Filling are Performed)
Next, the operation of the liquid pressure control apparatus 100 according to the first embodiment in which rapid filling is executed in addition to orifice filling will be described with reference to FIGS. 1, 2, and 4.
When the ignition is turned on and the engine 31 is driven (T0 in FIG. 4), the pump 11 is driven by the engine 31 and the line pressure increases from 0 (P1 in FIG. 4). Since the control unit 4 turns off the electromagnetic switching valve 3 and the back pressure channel 23 is opened by the electromagnetic switching valve 3, the control unit 4 enters the back pressure chamber 2a9 from the discharge liquid supply channel 21 via the back pressure channel 23. The liquid is supplied, and the back pressure in the back pressure chamber 2a9 increases (P2 in FIG. 4). Since the electromagnetic switching valve 3 is in the OFF state and the back pressure channel 23 is opened by the electromagnetic switching valve 3, the liquid is supplied from the discharge liquid supply channel 21 to the back pressure chamber 2a9 via the back pressure channel 23. The same back pressure as the line pressure acts in the back pressure chamber 2a9. Then, the back pressure in the back pressure chamber 2a9 acts on the ball 2d1, and the ball 2d1 moves away from the valve seat 2b6 against the urging force of the check valve spring 2d2. As a result, the liquid pressure is supplied to the accumulator 1 through the filling channel 2b5, the orifice port 2b4, the inflow port 2a6, and the second circulation channel 22b, and the accumulator pressure increases (P3 in FIG. 4). As described above, the flow passage area of the orifice port 2b4 is set smaller than the flow passage areas of the discharge liquid supply flow passage 21 and the back pressure flow passage 23. Therefore, the accumulator pressure gradually increases, and the unit of the accumulator pressure The degree of increase per hour is smaller than the degree of increase in line pressure per unit time.

  When the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is higher than the first specified pressure, the following quick filling is executed. That is, the control unit 4 supplies a drive current to the electromagnetic switching valve 3 to turn on the electromagnetic switching valve 3 (T1 in FIG. 4). Then, as shown in FIG. 2, the first back pressure channel 23 a and the second back pressure channel 23 b are blocked by the electromagnetic switching valve 3, and the second back pressure channel 23 b is connected to the drain channel 24. . In this state, the liquid in the back pressure chamber 2a9 flows through the second back pressure channel 23b and the drain channel 24 and is discharged to the liquid storage unit 12, and the back pressure in the back pressure chamber 2a9 is discharged. The back pressure chamber 2a9 becomes atmospheric pressure (P4 in FIG. 4). In this state, the liquid pressure does not act on the second pressure receiving surface F2, while the line pressure acts on the first pressure receiving surface F1. Therefore, as shown in FIG. 2, the valve body 2b moves rearward against the spring 2c and moves to the valve opening position, and the valve port 2a5 and the inflow port 2a6 communicate with each other through the front chamber 2a8.

  Then, the line pressure from the discharge liquid supply flow path 21 is supplied to the accumulator 1 via the first flow path 22a, the valve port 2a5, the front chamber 2a8, and the inflow port 2a6, and the accumulator pressure rapidly increases. (P5 in FIG. 4), the accumulator pressure becomes the same as the line pressure in a shorter time as compared with the orifice filling (P6 in FIG. 4). When the specified time has elapsed since the start of rapid filling, the control unit 4 turns off the electromagnetic switching valve 3 (T2 in FIG. 4). Thereby, the liquid is supplied to the back pressure chamber 2a9, and the back pressure in the back pressure chamber 2a9 is increased to the same liquid pressure as the line pressure (P7 in FIG. 4).

  When the engine 31 is stopped by the idling stop function (T3 in FIG. 4), the supply of the liquid from the pump 11 to the discharge liquid supply passage 21 is stopped, the liquid pressure is released from the liquid pressure operating unit 13, and the line pressure is reduced. 0 (P8 in FIG. 4), the liquid pressure does not act on the first pressure receiving surface F1. The back pressure channel check valve 26 prevents the liquid in the back pressure chamber 2a9 from flowing out to the discharge liquid supply channel 21 side, and the back pressure in the back pressure chamber 2a9 is maintained (P9 in FIG. 4). Further, the ball 2d1 is pressed against the valve seat 2b6 by the accumulator pressure and the urging force of the check valve spring 2d2, and the filling flow path check valve 2d is a flow path between the orifice port 2b4 and the valve body inflow port 2b7. The filling flow path 2b5 is closed. Thereby, the accumulator pressure is maintained at the same pressure as the back pressure (P10 in FIG. 4).

  The accumulator pressure from the accumulator 1 acts on the third pressure receiving surface F3, but due to the area difference between the second pressure receiving surface F2 and the third pressure receiving surface F3, a force toward the valve port 2a5 acts on the valve body 2b. . In addition, since the valve body 2b is urged toward the valve port 2a5 by the spring 2c, the tip 2b1 of the valve body 2b is pressed against the opening of the valve port 2a5 as shown in FIG. The state where the body 2b is located at the valve closing position is maintained. Thereby, even after the engine is stopped, the opening of the valve port 2a5 is closed by the tip 2b1 of the valve body 2b, and the accumulator pressure accumulated in the accumulator 1 is maintained (P10 in FIG. 4).

  When the driver's intention to restart is detected, the control unit 4 starts restarting the engine 31 and supplies a drive current to the electromagnetic switching valve 3 to turn on the electromagnetic switching valve 3 (FIG. 4). T4). Then, as shown in FIG. 2, the first back pressure channel 23 a and the second back pressure channel 23 b are blocked by the electromagnetic switching valve 3, and the second back pressure channel 23 b is connected to the drain channel 24. . In this state, the liquid in the back pressure chamber 2a9 flows through the second back pressure channel 23b and the drain channel 24 and is discharged to the liquid storage unit 12, and the back pressure in the back pressure chamber 2a9 is discharged. The back pressure chamber 2a9 becomes atmospheric pressure (P11 in FIG. 4). In this state, the liquid pressure does not act on the second pressure receiving surface F2, while the accumulator pressure from the accumulator 1 is input to the front chamber 2a8, and the accumulator pressure acts on the third pressure receiving surface F3 of the valve body 2b. Therefore, as shown in FIG. 2, the valve body 2b moves rearward against the spring 2c and moves to the valve opening position, and the valve port 2a5 and the inflow port 2a6 communicate with each other through the front chamber 2a8.

  Then, the liquid pressure is supplied from the accumulator 1 to the discharge liquid supply passage 21 via the inflow port 2a6, the front chamber 2a8, the valve port 2a5, and the flow passage 22 to increase the line pressure (see FIG. 4). P <b> 12), the liquid pressure is supplied to the liquid pressure operation unit 13. For this reason, as compared with a vehicle in which the liquid pressure control device 100 is not mounted, when the engine 31 is restarted, the liquid pressure is supplied to the liquid pressure operating unit 13 earlier, and the vehicle V can quickly restart. .

  When the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is higher than the first specified pressure, the above-described rapid filling is executed. That is, the control part 4 supplies a drive current to the electromagnetic switching valve 3, and maintains the state which set the electromagnetic switching valve 3 to the ON state (T5 of FIG. 4). As a result, the state in which the valve body 2b moves rearward against the spring 2c and is located at the valve opening position is maintained, and the state where the valve port 2a5 and the inflow port 2a6 communicate with each other via the front chamber 2a8 is maintained. The For this reason, the line pressure from the discharge liquid supply flow path 21 is supplied to the accumulator 1 via the first flow path 22a, the valve port 2a5, the front chamber 2a8, and the inflow port 2a6, and the accumulator pressure rises rapidly. (P13 in FIG. 4), the accumulator pressure becomes the same as the line pressure in a shorter time compared with the orifice filling (P14 in FIG. 4). When the specified time has elapsed since the start of rapid filling, the control unit 4 turns off the electromagnetic switching valve 3 (T6 in FIG. 4). Thereby, the liquid is supplied to the back pressure chamber 2a9, and the back pressure in the back pressure chamber 2a9 is increased to the same liquid pressure as the line pressure (P7 in FIG. 4).

(Flowchart of filling switching control)
Below, an example of the flowchart of the filling switching control which the control part 4 performs is demonstrated using FIG. When the ignition of the vehicle V is turned on, the program proceeds to step S11.
In step S11, the control unit 4 turns off the electromagnetic switching valve 3 and inputs the line pressure, which is the pressure in the discharge liquid supply passage 21, into the back pressure chamber 2a9 of the closing valve 2 as the back pressure. To. Thereby, when the pump 11 discharges the liquid by the operation of the engine 31, the liquid flows through the filling flow path 2 b 5 and the orifice port 2 b 4, and the orifice filling in which the accumulator pressure is gradually filled in the accumulator 1 is executed. .
When step S11 ends, the program proceeds to step S12.

  In step S12, when the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is smaller than the first specified pressure (step S12: YES), the control unit 4 returns the program to step S11. On the other hand, if the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is equal to or higher than the first specified pressure (step S12: NO), the control unit 4 advances the program to step S13. The first specified pressure is a pressure larger than a second specified pressure described later. When the vehicle V does not perform speed change and is traveling normally, the line pressure is maintained at a pressure higher than the first specified pressure.

In step S <b> 13, the control unit 4 turns on the electromagnetic switching valve 3 to a second state in which the back pressure in the back pressure chamber 2 a 9 of the blocking valve 2 is released. Thereby, when the pump 11 discharges the liquid by the operation of the engine 31, the liquid circulates through the front chamber 2a8, and the quick filling in which the accumulator pressure is rapidly filled in the accumulator 1 is executed.
When step S13 ends, the control unit 4 advances the program to step S14.

  In step S14, when the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is larger than the second specified pressure (step S14: YES), the control unit 4 advances the program to step S15. On the other hand, when the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is equal to or lower than the second specified pressure, for example, when the line pressure decreases due to a shift operation or the like (step S14: NO), The program is returned to step S11, the rapid filling is stopped, and the orifice filling is executed. The second specified pressure is a pressure smaller than the first specified pressure described above. The second specified pressure is a value obtained by adding a specified margin pressure to the liquid pressure required for engaging the clutch and brake of the transmission at the time of shifting.

In step S15, the control unit 4 turns the electromagnetic switching valve 3 in the OFF state after a lapse of a specified time after the electromagnetic switching valve 3 is turned in the ON state in step S13. The specified time is set to a time sufficient for the accumulator pressure accumulated in the accumulator 1 to reach the line pressure after the electromagnetic switching valve 3 is turned on.
When step S15 ends, the control unit 4 returns the program to step S11.

  In step S15, the control unit 4 determines that the accumulator pressure detected by an accumulator pressure detection unit (not shown) that detects the accumulator pressure has reached a filling pressure that is the same as or slightly smaller than the line pressure. If it is determined, the electromagnetic switching valve 3 may be turned off.

(Effect of the liquid pressure control device of the first embodiment)
As is clear from the above description, the liquid pressure control device 100 of the first embodiment has a mechanical shut-off valve 2 and an electromagnetic solenoid switching valve 3. The blocking valve 2 closes the valve port 2a5 when the back pressure is input to the back pressure chamber 2a9, and opens the valve port 2a5 when the back pressure is not input to the back pressure chamber 2a9. The electromagnetic switching valve 3 switches between a first state in which the discharge liquid supply channel 21 and the back pressure chamber 2a9 are connected and a second state in which the back pressure input to the back pressure chamber 2a9 is released. As a result, when the electromagnetic switching valve 3 is in the first state, the line pressure of the discharge liquid supply flow path 21 is input as the back pressure to the back pressure chamber 2a9, the valve port 2a5 is closed, and the liquid pressure is accumulated in the accumulator 1. Is retained. On the other hand, when the electromagnetic switching valve 3 is in the second state, the back pressure input to the back pressure chamber 2a9 is released, the valve port 2a5 is opened, and the liquid pressure accumulated in the accumulator 1 is operated by the liquid pressure operation. It can be supplied to the section 13. Thus, the electromagnetic switching valve 3 switches between the first state and the second state, and does not operate against the high-pressure liquid pressure accumulated in the accumulator 1. For this reason, since there is no need to generate a large operating force in the electromagnetic switching valve 3, the electromagnetic switching valve 3 can be reduced in size. Further, since the blocking valve 2 and the electromagnetic switching valve 3 are separate bodies, the degree of freedom of the arrangement positions of the blocking valve 2 and the electromagnetic switching valve 3 is high, and the mounting of the liquid pressure control device 100 on the vehicle V is easy.

  In addition, when changing specifications such as changing the capacity, pressure, and discharge flow rate of the accumulator 1 according to the amount of liquid supplied to the liquid pressure operating unit 13 and the liquid pressure, the electromagnetic switching valve 3 is not changed. This can be dealt with by changing only the blocking valve 2 to a specification corresponding to the accumulator 1. For this reason, the specification change of the liquid pressure control device 100 can be easily performed. For example, when the capacity of the accumulator 1 is increased, it is only necessary to increase the size of the closing valve 2, and it is not necessary to change the liquid pressure control device 100 other than the accumulator 1 and the closing valve 2. It becomes easy to change the specifications.

  The filling flow path 2b5 supplies the accumulator 1 with a line pressure that is the pressure in the discharge liquid supply flow path 21. The filling flow path check valve 2d is provided in the filling flow path 2b5, and the liquid flow from the back pressure flow path 23 (line pressure action flow path) side, which is the flow path on which the line pressure is applied, to the accumulator 1 side. Flow is allowed, but liquid flow from the accumulator 1 side to the back pressure flow path 23 (line pressure action flow path) side is not allowed. The orifice port 2b4 increases the pipe resistance of the liquid flowing through the filling channel 2b5. Thereby, when the orifice filling is executed, the liquid flows into the accumulator 1 through the orifice port 2b4, so that the accumulator pressure gradually increases. For this reason, the degree of increase in accumulator pressure per unit time is smaller than the degree of increase in line pressure per unit time. As a result, the line pressure drop due to a sudden rise in accumulator pressure is suppressed, and the line pressure rises per unit time compared to the case where the accumulator pressure rises at the same rate of increase per unit time as the line pressure. The degree is greater. Therefore, a desired liquid pressure is quickly supplied by the liquid pressure operating unit 13. In addition, a decrease in the flow rate of the liquid supplied from the discharge liquid supply channel 21 to the liquid pressure operating unit 13 is suppressed.

  A back pressure chamber 2a9 (electromagnetic switching valve) is connected to the first back pressure flow channel 23a, which is connected to the discharge liquid supply flow channel 21 from the electromagnetic switch valve 3 of the back pressure flow channel 23, from the discharge liquid supply flow channel 21 side. 3) A back pressure flow path check valve 26 is provided which allows liquid flow to the side but does not allow liquid flow from the back pressure chamber 2a9 (electromagnetic switching valve 3) side to the discharge liquid supply flow path 21 side. ing. As a result, when the electromagnetic switching valve 3 places the liquid pressure control device 100 in the first state by the back pressure flow path check valve 26, the liquid in the back pressure chamber 2a9 flows out to the discharge liquid supply flow path 21 side. Is prevented, and the back pressure in the back pressure chamber 2a9 is maintained. For this reason, the state where the flow passage is closed by the closing valve 2 is maintained, and the accumulator pressure accumulated in the accumulator 1 is maintained.

  The shut-off valve 2 is provided so as to be movable in a cylinder 2a in which a valve body housing portion 2a4 that is a space is formed, and in the valve body housing portion 2a4. And a valve body 2b to be divided. The cylinder 2a communicates with the front chamber 2a8 through the flow channel 22 and is connected to the discharge liquid supply flow channel 21 through the valve port 2a5, and communicates with the front chamber 2a8 through the flow channel 22 and the accumulator 1. An inflow port 2a6 connected to is formed. When the back pressure is input to the back pressure chamber 2a9, the valve port 2a5 is closed by the valve body 2b. As a result, when the second state is reached, the back pressure chamber 2a9 becomes atmospheric pressure, and the pressure difference between the back pressure chamber 2a9, which is at atmospheric pressure, and the front chamber 2a8 where the accumulator pressure acts is increased. Then, with little time lag, the valve body 2b moves away from the valve port 2a5 and the valve port 2a5 is opened. For this reason, the accumulator pressure is supplied from the accumulator 1 to the liquid pressure operating unit 13 with almost no time lag after the electromagnetic switching valve 3 is set to the second state, and the responsiveness of the liquid pressure control device 100 is improved.

  The filling flow path 2b5 is formed in the valve body 2b so as to connect the back pressure chamber 2a9 and the inflow port 2a6. The filling flow path check valve 2d and the orifice port 2b4 are provided in the valve body 2b. Thus, since the filling flow path 2b5, the filling flow path check valve 2d, and the orifice port 2b4 are provided in the valve body 2b of the closing valve 2, the filling flow path 2b5 and the filling flow path check valve 2d are closed. As a configuration provided outside the valve 2, the liquid pressure control device 100 can be reduced in size.

  When the controller 4 accumulates the liquid pressure in the accumulator 1, the electromagnetic switching valve 3 sets the first state, the orifice filling to supply the line pressure to the accumulator 1 via the filling flow path 2 b 5, and the electromagnetic switching valve. 3 is switched to the second state, and the line pressure is switched to one of the rapid filling supplied to the accumulator 1 through the front chamber 2a8. As a result, when it is necessary to supply the liquid pressure to the liquid pressure operating unit 13, the accumulator pressure is gradually accumulated in the accumulator 1 by filling the orifice, so that the liquid pressure operating unit 13 can quickly increase the desired liquid pressure. Can be supplied. On the other hand, when it is not necessary to supply the liquid pressure to the liquid pressure operating unit 13, the accumulator pressure is quickly accumulated in the accumulator 1 by rapid filling, thereby completing accumulator pressure accumulation in the accumulator 1 in a short time. Can be made. Thus, orifice filling and rapid filling can be selected depending on whether or not the liquid pressure needs to be supplied to the liquid pressure operating unit 13.

  Further, in the liquid pressure control device 100, when the back pressure is input to the back pressure chamber 2a9 and the valve body 2b is located at the end of the moving range on the front chamber 2a8 side, the valve port 2a5 is the valve body 2b. It is comprised so that it may be obstruct | occluded by. Thereby, even if the back pressure input to the back pressure chamber 2a9 flows out to the front chamber 2a8 side through the clearance between the inner peripheral surface of the cylinder 2a and the outer peripheral surface of the valve body 2b, the valve port 2a5. Is closed by the valve body 2b, the back pressure does not flow out from the valve port 2a5. For this reason, the back pressure in the back pressure chamber 2a9 is maintained, and the state in which the valve port 2a5 is closed by the valve body 2b is maintained. As a result, the back pressure in the back pressure chamber 2a9 is maintained without providing a seal member for ensuring the oil tightness of the back pressure chamber 2a9 between the inner peripheral surface of the cylinder 2a or the outer peripheral surface of the valve body 2b. Thus, the cost of the liquid pressure control device 100 can be reduced. Further, since it is not necessary to provide the above-described seal member, the sliding resistance of the valve body 2b with respect to the cylinder 2a does not increase, and the responsiveness of the closing valve 2 is improved.

(Liquid pressure control device of the second embodiment)
Hereinafter, the difference of the structure of the liquid pressure control device 200 of the second embodiment from the liquid pressure control device 100 of the first embodiment will be described with reference to FIG. In addition, about the structure of the liquid pressure control apparatus 200 of 2nd embodiment, about the part of the same structure as the liquid pressure control apparatus 100 of 1st embodiment, in FIG. 6, it is the same as the liquid pressure control apparatus 100 of 1st embodiment. Reference numerals are assigned and explanations thereof are omitted.

  The liquid pressure control apparatus 200 according to the second embodiment includes a filling channel 27, a filling channel check valve 28, and an orifice 29. On the other hand, the liquid pressure control apparatus 200 of the second embodiment does not have the filling flow path check valve 2d. Further, the orifice port 2b4, the filling channel 2b5, and the valve body inflow port 2b7 are not formed in the valve body 2b of the liquid pressure control device 200 of the second embodiment.

  The filling flow path 27 is a second flow path 22b that is a flow path that connects the discharge liquid supply flow path 21 closer to the liquid pressure operating unit 13 than the supply flow path check valve 25, the inflow port 2a6, and the accumulator 1. And connected. The filling flow path 27 is a flow path for supplying the line pressure of the discharge liquid supply flow path 21 to the accumulator 1. The line pressure is the pressure inside the discharge liquid supply channel 21. The filling flow path check valve 28 is provided in the filling flow path 27. The filling flow path check valve 28 allows the liquid to flow from the discharge liquid supply flow path 21 (pump 11) side to the accumulator 1 (second flow path 22b) side, but the accumulator 1 (second flow path). The flow of the liquid from the 22b) side to the discharge liquid supply channel 21 side is not allowed. That is, the filling flow path check valve 28 allows the liquid to flow from the discharge liquid supply flow path 21 side, which is the flow path on which the line pressure is applied, to the accumulator 1 side, but supplies the discharge liquid from the accumulator 1 side. The flow of liquid to the flow path 21 side is not allowed. In the present embodiment, the discharge liquid supply channel 21 which is a channel on which the line pressure is applied corresponds to the line pressure operation channel described in the claims.

  The orifice 29 is provided in the filling channel 27. In the present embodiment, the orifice 29 is provided in the filling channel 27 between the connection portion between the filling channel 27 and the second circulation channel 22 b and the filling channel check valve 28. The flow passage area of the orifice 29 is set smaller than the flow passage areas of the discharge liquid supply flow passage 21, the filling flow passage 27, the flow passage 22, the valve port 2a5, and the inflow port 2a6. Thereby, when the accumulator pressure is accumulated in the accumulator 1, the liquid flows into the accumulator 1 through the orifice 29 having a small flow path area. For this reason, the reverse of the filling flow path from the connection portion 21b is more than the pipe resistance of the discharge liquid supply flow channel 21 on the liquid pressure operating unit 13 side than the connection portion 21b between the filling flow channel 27 and the discharge liquid supply flow channel 21. The pipe resistance of the flow path reaching the accumulator 1 via the stop valve 28 and the second flow path 22b is larger.

(Operation of the liquid pressure control apparatus of the second embodiment in which only orifice filling is executed)
Next, the operation of the liquid pressure control apparatus 200 according to the second embodiment in which only orifice filling is executed will be described with reference to FIGS. 3 and 6.
When the ignition is turned on and the start of the engine 31 is started (T0 in FIG. 3), the pump 11 is driven by the engine 31 and the line pressure is increased from 0 (P1 in FIG. 3) to the first pressure receiving surface F1. Line pressure acts. Since the electromagnetic switching valve 3 is turned off by the control unit 4 and the back pressure channel 23 is opened by the electromagnetic switching valve 3, the discharge liquid supply channel 21 passes through the back pressure channel 23 to the back pressure chamber 2 a 9. Liquid is supplied, the back pressure in the back pressure chamber 2a9 rises to the same pressure as the line pressure (P2 in FIG. 3), and the same back pressure as the line pressure acts in the back pressure chamber 2a9. Since the pressure receiving area of the second pressure receiving surface F2 is larger than the pressure receiving area of the first pressure receiving surface F1, a force toward the valve port 2a5 (front side) acts on the valve body 2b by the liquid pressure. In addition, since the valve body 2b is biased toward the valve port 2a5 by the spring 2c, as shown in FIG. 6, the valve body 2b has an end portion (valve closing position) on the front chamber 2a8 side of its moving range. ) And the tip 2b1 of the valve body 2b is pressed against the opening of the valve port 2a5. Thereby, the opening part of valve opening 2a5 is obstruct | occluded by the front-end | tip part 2b1 of the valve body 2b.

  As the line pressure increases, the liquid pressure is supplied from the discharge liquid supply channel 21 to the accumulator 1 via the filling channel 27 and the second circulation channel 22b, and the accumulator pressure increases (P3 in FIG. 3). ). As described above, since the flow passage area of the orifice 29 is set smaller than the flow passage area of the discharge liquid supply flow passage 21, the accumulator pressure gradually rises, and the degree of increase of the accumulator pressure per unit time is as follows. The degree of increase in line pressure per unit time is smaller. For this reason, compared with the case where the accumulator pressure increases at the same increase rate per unit time as the line pressure, the increase rate per unit time of the line pressure becomes larger. As a result, a desired liquid pressure is quickly supplied by the liquid pressure operating unit 13. The accumulator pressure increases and becomes the same pressure as the line pressure (P4 in FIG. 3).

  When the vehicle V is stopped and the engine 31 is stopped by the idling stop function (T1 in FIG. 3), the supply of the liquid from the pump 11 to the discharge liquid supply passage 21 is stopped, and the liquid pressure operating unit 13 supplies the liquid pressure. , The line pressure becomes 0 (P5 in FIG. 3), and the liquid pressure does not act on the first pressure receiving surface F1. The accumulator pressure from the accumulator 1 acts on the third pressure receiving surface F3, but due to the area difference between the second pressure receiving surface F2 and the third pressure receiving surface F3, a force toward the valve port 2a5 acts on the valve body 2b. . In addition, since the valve body 2b is urged toward the valve port 2a5 by the spring 2c, the tip 2b1 of the valve body 2b is pressed against the opening of the valve port 2a5 as shown in FIG. The state where the body 2b is located at the valve closing position is maintained. Thereby, even after the engine is stopped, the opening of the valve port 2a5 is closed by the tip 2b1 of the valve body 2b, and the accumulator pressure accumulated in the accumulator 1 is maintained (P7 in FIG. 3). In addition, since the flow of the liquid from the accumulator 1 side to the discharge liquid supply flow path 21 side is blocked by the filling flow path check valve 28, the accumulator pressure accumulated in the accumulator 1 is maintained.

  The operation after T2 of the liquid pressure control device 200 according to the second embodiment in which only orifice filling is executed is the same as the operation after T2 in the liquid pressure control device 100 according to the first embodiment in which only orifice filling is executed. Therefore, the description is omitted.

(Operation of Liquid Pressure Control Device of Second Embodiment in which Orifice Filling and Rapid Filling are Performed)
Next, the operation of the liquid pressure control apparatus 200 according to the second embodiment in which orifice filling and rapid filling are executed will be described with reference to FIGS. 4 and 6.
When the ignition is turned on and the start of the engine 31 is started (T0 in FIG. 4), the pump 11 is driven by the engine 31 and the line pressure is increased from 0 (P1 in FIG. 4) to the first pressure receiving surface F1. Line pressure acts. Since the electromagnetic switching valve 3 is in the OFF state and the back pressure channel 23 is opened by the electromagnetic switching valve 3, the liquid is supplied from the discharge liquid supply channel 21 to the back pressure chamber 2a9 via the back pressure channel 23. The back pressure in the back pressure chamber 2a9 increases to the same pressure as the line pressure (P2 in FIG. 4), and the same back pressure as the line pressure acts in the back pressure chamber 2a9. As the line pressure increases, the liquid pressure is supplied from the discharge liquid supply channel 21 to the accumulator 1 via the filling channel 27 and the second circulation channel 22b, and the accumulator pressure increases (P3 in FIG. 4). ). As described above, since the flow passage area of the orifice 29 is set smaller than the flow passage area of the discharge liquid supply flow passage 21, the accumulator pressure gradually rises, and the degree of increase of the accumulator pressure per unit time is as follows. The degree of increase in line pressure per unit time is smaller.

  When the control unit 4 determines that the line pressure detected by the line pressure detection unit 5 is equal to or higher than the first specified pressure, the following quick filling is executed. That is, the control unit 4 supplies a drive current to the electromagnetic switching valve 3 to turn on the electromagnetic switching valve 3 (T1 in FIG. 4). Then, the first back pressure channel 23 a and the second back pressure channel 23 b are blocked by the electromagnetic switching valve 3, and the second back pressure channel 23 b is connected to the drain channel 24. In this state, the liquid in the back pressure chamber 2a9 flows through the second back pressure channel 23b and the drain channel 24 and is discharged to the liquid storage unit 12, and the back pressure in the back pressure chamber 2a9 is discharged. The back pressure chamber 2a9 becomes atmospheric pressure (P4 in FIG. 4). In this state, the liquid pressure does not act on the second pressure receiving surface F2, while the line pressure acts on the first pressure receiving surface F1. For this reason, the valve body 2b moves backward against the spring 2c and moves to the valve opening position, and the valve port 2a5 and the inflow port 2a6 communicate with each other through the front chamber 2a8.

  Then, the line pressure from the discharge liquid supply flow path 21 is supplied to the accumulator 1 via the first flow path 22a, the valve port 2a5, the front chamber 2a8, and the inflow port 2a6, and the accumulator pressure rapidly increases. (P5 in FIG. 4), the accumulator pressure becomes the same as the line pressure in a shorter time as compared with the orifice filling (P6 in FIG. 4). The operation after T3 of the liquid pressure control device 200 of the second embodiment in which the orifice filling and the rapid filling are executed is the operation after T3 of the liquid pressure control device 100 of the first embodiment in which the orifice filling and the quick filling are executed. The description is omitted.

(Effect of the liquid pressure control device of the second embodiment)
As is apparent from the above description, the filling flow path 27 of the liquid pressure control device 200 of the second embodiment connects the discharge liquid supply flow path 21, the inflow port 2a6, and the accumulator 1 as shown in FIG. Is connected to the second flow passage 22b, which is a flow passage. For this reason, compared with the structure (FIG. 1) which forms the filling flow path 2b5 in the valve body 2b, the structure of the liquid pressure control apparatus 200 becomes simple, and as a result, the manufacturing cost of the liquid pressure control apparatus 200 is reduced. Can do.

(Another embodiment)
In the embodiment described above, the tip 2b1 of the valve body 2b has a truncated cone shape. However, the distal end portion 2b1 may have a semicircular shape, a planar shape, or the like as long as the first flow path 22a and the front chamber 2a8 can be closed.
There is no problem even in an embodiment in which a seal member is provided for ensuring the oil tightness of the back pressure chamber 2a9 between the inner peripheral surface of the cylinder 2a or the outer peripheral surface of the valve body 2b.
The liquid pressure control devices 100 and 200 of the present embodiment can also be used for liquids other than oil, such as brake fluid and water.

  DESCRIPTION OF SYMBOLS 1 ... Accumulator, 2 ... Blocking valve, 2a ... Cylinder, 2a4 ... Valve body storage part, 2a5 ... Valve port, 2a6 ... Inflow port, 2a8 ... Front chamber, 2a9 ... Back pressure chamber, 2b ... Valve body, 2b4 ... Orifice port (Orifice), 2b5: Filling channel, 2b9: Line pressure acting channel, 2d ... Filling channel check valve, 3 ... Electromagnetic switching valve, 11 ... Pump, 21 ... Discharge liquid supply channel (Line pressure acting channel) ), 23 ... Back pressure flow path (line pressure action flow path), 26 ... Back pressure flow path check valve, 27 ... Fill flow path, 28 ... Fill flow path check valve, 29 ... Orifice, 31 ... Engine, 100 ... Liquid pressure control device according to one embodiment, 200... Liquid pressure control device according to the second embodiment

Claims (4)

A liquid pressure control device that controls the liquid pressure supplied to a liquid pressure operating unit that operates according to the liquid pressure of the liquid,
An accumulator for accumulating the liquid pressure;
A discharge liquid supply flow path that connects the pump that is driven by the engine to discharge the liquid and the liquid pressure operating unit;
A cylinder in which a valve body storage portion that is a space is formed, and a valve body that is movably provided in the valve body storage portion and divides the valve body storage portion into a front chamber and a back pressure chamber. The cylinder is formed with a valve port that communicates with the front chamber and is connected to the discharge liquid supply flow path and is opened and closed by the valve body, and an inflow port that communicates with the front chamber and is connected to the accumulator. When a back pressure, which is a pressure for closing the back pressure chamber, is input, the valve port is closed by the valve body on which the back pressure acts, and the back pressure is input to the back pressure chamber. If not, a mechanical closing valve in which the valve port is opened by the valve body on which the liquid pressure that flows from the accumulator into the front chamber acts;
A back pressure channel connecting the back pressure chamber and the discharge liquid supply channel;
An electromagnetic switching valve that is provided in the middle of the back pressure flow path and switches between a first state that connects the discharge liquid supply flow path and the back pressure chamber and a second state that opens the back pressure chamber; ,
It is provided in the back pressure flow path on the discharge liquid supply flow path side from the electromagnetic switching valve, and allows the liquid to flow from the discharge liquid supply flow path side to the back pressure chamber side, but from the back pressure chamber side. A back pressure flow path check valve that does not allow the flow of the liquid to the discharge liquid supply flow path side;
A filling flow path for supplying a line pressure, which is a pressure in the discharge liquid supply flow path, to the accumulator;
The fluid is allowed to flow from the accumulator side to the accumulator side from the line pressure acting channel side, which is provided in the filling channel, and the line pressure is acting on, but from the accumulator side to the line pressure acting channel side. A fluid flow check valve that does not allow the fluid to flow to
A liquid pressure control device comprising: an orifice for increasing a pipe resistance of the liquid flowing through the filling flow path. The filling flow path is formed in the valve body so as to connect the back pressure chamber and the inflow port,
The liquid pressure control device according to claim 1, wherein the filling flow path check valve and the orifice are provided in the valve body.   The liquid pressure control device according to claim 1, wherein the filling flow path connects the discharge liquid supply flow path and a flow path connecting the inflow port and the accumulator. When accumulating the liquid pressure in the accumulator,
Filling the first state with the electromagnetic switching valve, filling the line pressure to the accumulator via the filling flow path,
4. The control unit according to claim 1, further comprising: a controller that switches the line pressure to any one of the quick filling that supplies the line pressure to the accumulator through the front chamber by setting the second state by the electromagnetic switching valve. The liquid pressure control device according to claim 1.

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