JPH0328540A - Cutoff valve - Google Patents

Abstract

PURPOSE:To heighten the sealing performance between an input port and an output port regardless of processing of comparatively low accuracy by providing both a partition member having a circular opening and a valve member, which faces this circular opening and which has an aligning surface inclining from a position far from the opening toward another position near to the opening. CONSTITUTION:When the pressure at a control pressure port 72 drops and a spool 78 is driven to the left (cutoff direction) by the force of a compression coil spring 79, a spherical surface 78a of the spool 78 abuts on an opening edge of a circular opening 77ao of a second guide 77a. At this time, or when the spherical surface 78a is in contact with a circular edge of the circular opening 77ao, since the spherical surface 78a inclines from a position far from the opening 77ao toward another position near to the opening 77ao, if the entire periphery of the spherical surface 78a fails to closely abut on the entire periphery of the opening edge at the beginning, the force, which tends to bring the shaft center line (in the direction of movement or the right- and-left direction) of the spool 78 in line with the center of the opening 77ao, acts on the spool 78 in the abutted range. This force acts also on both a backup spring 76b and an O-ring 76o. Thus, the O-ring 76o allows the spool 78 to move, maintaining the sealing performance.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is designed to cut off (or allow flow to flow between) an input port and an output port when the pressure of a flow control pressure port is less than a predetermined pressure. In particular, regarding cut valves that allow flow (blocking) when the pressure exceeds the
This relates to a cut valve that shuts off the output port from the input port and holds the pressure of fluid equipment connected to the output port when the output pressure of a pressure source fails (decreases or increases). (Prior art) For example, Japanese Utility Model Publication No. 62-202404 discloses that when the discharge pressure of a hydraulic pump driven by an engine on a vehicle decreases, a cut valve is used to reduce the pressure of a shock absorber and its pressure. A hydraulic system has been proposed that prevents pressure drop in the shock absorber by blocking the hydraulic circuit that controls elevation and descent. In this type of cut valve, for example, the discharge pressure of a hydraulic bomb is applied to one end of the spool through a control pressure port,
In addition, the coil spring applies a force to the spool in the opposite direction to the force applied by the discharge pressure. When the discharge pressure exceeds a predetermined pressure corresponding to the force of the coil spring, the spool moves to a position where there is communication between the input port and the output port. When the discharge pressure falls below a predetermined pressure, the force of the coil spring moves the subur to the position where it cuts off between the input and output ports, and the shock absorber is cut off from the pressure control hydraulic line (shock absorber pressure hold). (Problem to be Solved by the Invention) Since the spool is slidably supported at two points in the direction of movement, the movement thereof is relatively smooth in the flowing state. However, in the cut-off state, the opening/closing surface of the subur comes into contact with the communication opening between the input port and the output port, blocking the two, resulting in a three-point support structure. In a three-point support structure, if each support point is not accurately aligned in a straight line, there will be a large resistance to movement of the subur, and the input port/
Poor sealing between output ports. In other words, pressure leaks are likely to occur. Therefore, it is necessary to process each point of the three-point support with high precision.

The purpose of the present invention is to provide a cut valve with high sealing performance between an input port and an output port with relatively low precision machining. [Structure of the Invention] (Means for Solving the Problems) The cut valve of the present invention includes an input port (73), an output port (75); a space that communicates with the input port (73), and a space that communicates with the output port (75). A partition member (77a) having a circular opening (77ao) between the communicating spaces and communicating between the two spaces; an opening (77ao) facing the circular opening (77ao);
The valve member (77ao) has a plane of interest (78a) inclined from a position far from the opening (77ao) to a point close to the opening (77ao).
8); A control pressure port (72) communicating with a control pressure space (72a) that applies pressure to one surface (78b) of the valve member (78)
); the valve member (78) in the opposite direction to the force exerted by the pressure in the control pressure space (72a) on the one surface (78b) of the valve member (78);
Spring member (79) that applies force to the control pressure space (72a
) is movable in the direction in which the force exerted on one surface (78b) of the valve member (78) and the force of the spring member (79) are opposite to each other,
A first support member (77d) that supports the valve member (78) via the first sealing material (77do); a control pressure space (72
The valve member (7
8) is movably connected to the backup ring (7).
6b); and a pack-up ring (76b),
A second support member (76) is provided which supports the second support member (76) through a second elastic sealing material (76o). The symbols inside brackets indicate corresponding elements in the embodiments shown in the drawings and described later. (Function) When the pressure in the control pressure port (72) is high (low) and the valve member (78) is driven to the flow position against the force of the spring member (79), the valve member ( 78) is the lth
The lth support member (77d) is inserted through the sealing material (77do).
), and the second support member (7
6) and is supported at two points. When the pressure in the control pressure port (72) decreases (increases) and the valve member (78) is driven in the blocking direction by the force of the spring member (79), the alignment surface (78a) of the valve member (78) ) is a space communicating with the input port (73) and the output port (73).
5) and abuts against the opening edge of a circular opening (77ao) that communicates with both spaces. At this time, the alignment surface (78a) of the valve member (78) hits the circular edge of the opening (77ao), and the alignment surface (78a) is directed from a position far from the opening (77ao) to a point close to the opening (77ao). Therefore, if the entire circumference of the alignment surface (78a) does not come into perfect contact with the entire circumference of the opening edge, the valve member (78a) will be damaged at the contact area.
8) is applied with a force that aligns its axis in the moving direction with the center of the opening (77ao), and this forces the backup ring (76b) and the second sealing material (76) through the valve member (78).
o). Since the No. I sealing material (76o) is elastic, the portions to which this force is applied contract and the other portions expand, maintaining the sealing properties while moving the valve member (78) in the direction on which the force acts. Allow displacement to . This allows the alignment surface (
The entire circumference of 78a) comes into close contact with the circular opening (77ao), and the input port (73) and output port (75) are completely blocked. Backup ring (76b)
is displaced together with the valve member (78), so the sliding resistance between the bank up ring (76b) and the valve member (78) does not substantially change, resulting in smooth movement of the valve member (78). Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings. (Embodiment) Figure 1 shows an outline of the mechanism of a vehicle body support device incorporating an embodiment of the present invention. The hydraulic pump 1 is a radial pump, which is disposed in the engine room, is driven to rotate by the vehicle engine (not shown), sucks oil from the reservoir 2, and pumps the oil at a rotational speed of a predetermined speed or higher. Discharge oil to high pressure port 3 at a specified flow rate. High pressure port 3 of radial pump for suspension pressure supply
is connected to an accumulator 4 for absorbing pulsation, a main check valve 50 and a relief valve 60+i, and high pressure oil in the high pressure port 3 is supplied to the high pressure supply pipe 8 through the main check valve 50.

The main check valve 50 prevents oil from flowing back from the high pressure supply pipe 8 to the high pressure port 3 when the pressure in the high pressure port 3 is lower than the pressure in the high pressure supply pipe 8 .

The relief valve 60m connects the high pressure port 3 to the reservoir return pipe 1l, which is one of the return oil passages to the reservoir 2, when the pressure in the high pressure port 3 exceeds a predetermined pressure.
Maintain the pressure in high pressure port 3 at a substantially constant pressure. The high pressure supply pipe 8 includes a front wheel suspension loaf L,
a front wheel high pressure supply pipe 6 for supplying high pressure to the 100fr;
A rear wheel high pressure supply pipe 9 for supplying high pressure to the rear suspensions 100r L and 100rr communicates with each other, and the front wheel high pressure supply pipe 6 is connected to an accumulator 7 (for the front wheels), and the rear wheel high pressure supply pipe 9 is connected to an accumulator 7 (for front wheels). 10 (for the rear axle) is in communication.

The front wheel high pressure supply pipe 6 has... A pressure control well 80fr is connected via an oil filter, and this pressure control well 80f
r is the pressure of the front wheel high pressure supply pipe 6 (hereinafter referred to as front wheel line pressure),
Required pressure (pressure corresponding to the current value of the electric coil:
The pressure is adjusted (pressure lowered) to (suspension support pressure) and applied to the cut valve 70fr and the relief valve 60fr. When the pressure of the front wheel high pressure supply pipe 6 (front wheel side line pressure) is less than a predetermined low pressure, the cut valve 70fr closes the pressure control well 80fr.
(to the suspension) and the hollow piston rod l02fr of the shock absorber 101fr of the suspension 100fr.
This prevents pressure from leaking from the pressure control valve 80ft to the pressure control valve 80ft, and while the front wheel side line pressure is above a predetermined low pressure,
The output pressure (suspension support pressure) is directly supplied to the piston rond 102fr. relief valve 60fr
is shock absorber 101. Limit the internal pressure of f r to below the upper limit. That is, when the pressure (suspension support pressure) at the output port 84 of the pressure control well 80fr exceeds a predetermined high pressure, the output port 84 is connected to the reservoir return pipe 1.
1, the pressure at the output port of the pressure control well 80fr is maintained substantially below a predetermined high pressure. relief valve 6
0fr further buffers the propagation to the II pressure control well 80fr when the internal pressure of the shock absorber lo1fr rises shockingly due to a thrust impact from the road surface to the front right axle, and the internal pressure of the 9 shock absorber lo1fr When the shock absorber 101f rises
r internal pressure through the piston rond 100fr and the cut valve. It is discharged into the reservoir return pipe l1. Suspension 100fr roughly consists of shock absorber 101fr and dark rack coil spring 11.9f.
It corresponds to the pressure supplied to the shock absorber 101fr via the output port 84 of the pressure control well 80fr and the piston rond 102fr (pressure regulated by the pressure control valve 80fr: suspension support pressure). The vehicle body is supported at the same height (relative to the front right vehicle height). The supporting pressure given to the shock absorber 101fr is:
The pressure is detected by the pressure sensor 13fr, and the pressure sensor 13fr generates an analog signal indicating the detected support pressure. A vehicle height sensor 15f is installed in the vehicle body near the suspension 100fr.
r is installed, and the link connected to the rotor of the transport sensor 15fr is connected to the front right wheel. The vehicle height sensor 15fr generates an electric signal (digital data) indicating the vehicle height of the front right wheel (the height of the vehicle body relative to the wheel). Similar to the above, pressure control valve 80fL, cut valve 70fL, relief valve 60fL-vehicle height sensor 15
Similarly, a pressure sensor 13fL and a pressure sensor 13fL are assigned to the front left wheel suspension 100fL, and a pressure control valve 80fL is connected to the front wheel high pressure supply pipe 6 to maintain the required pressure (support pressure). the suspension 100
f L's shock absorber 101f L's piston rond lO2fL is given. Same as above, pressure control valve 80rr + cut valve 7
0rr l Relief valve 60rr, vehicle height sensor 1
Similarly, a pressure sensor 13rr and a pressure sensor 13rr are assigned to the rear right wheel suspension 100rr, and a pressure control valve 80rr is connected to the rear wheel high pressure supply pipe 9 to apply the required pressure (support pressure) to the suspension. loOrr
Piston rod 10 of shock absorber 101rr
Give to 2rr.

Furthermore, similar to the above, pressure control valve 80rL + cut valve 70rLt relief valve 60rL, vehicle height sensor 15r
Similarly, a pressure sensor 13rL and a pressure sensor 13rL are assigned to the front left wheel suspension 100rL, and a pressure control valve 80rL is connected to the rear wheel high pressure supply pipe 9 to maintain the required pressure (support pressure). the suspension 100r
The L shock absorber 101r and the L piston rod 102r are given to the L shock absorber 101r.

In this example, the engine is installed on the front wheel side.
Along with this, hydraulic bomb 1 is moved to the front wheel side (engine room).
equipped with hydraulic pump 1 to rear wheel suspension 1.
The piping length from hydraulic pump 1 to front wheel suspension l00fr, 100fL is 00rr, 100rL.
It is longer than the piping length up to. Therefore, the pressure drop due to the piping is large on the rear wheel side, and if an oil leak occurs in the piping, the pressure drop on the rear wheel side will be the largest. Therefore, a pressure sensor 13 for detecting line pressure is installed in the rear wheel high pressure supply pipe 9.
rm is connected. On the other hand, the pressure in the reservoir return pipe l1 is the lowest at the end of the two reservoirs, and the pressure tends to increase as the distance from the reservoir 2 increases. I am trying to detect it. A bypass valve 120 is connected to the rear wheel high pressure supply pipe 9. This bypass valve 120 regulates the pressure of the high-pressure supply pipe 8 to a pressure corresponding to the current value of the electric coil (obtains the required line pressure). Also, the ignition switch is open (engine stops: engine stops)
When this occurs, the line pressure is reduced to substantially zero (atmospheric pressure in the reservoir 2 through the reservoir return pipe 1l) (due to this decrease in line pressure, the cut valve 70 f r
+70 f L +70rr, 70r L is turned off to prevent pressure loss in the shock absorber), and lighten the load when restarting the engine (bomb 1). Figure 2 shows an enlarged longitudinal section of the suspension 100fr. Shock absorber 101fr piston rond 1
A piston 103 fixed to 02fr roughly divides the inside of the inner cylinder 104 into an upper chamber 105 and a lower chamber 106.

Suspension support pressure (hydraulic pressure) is supplied to the piston rod 102fr from the output port of the cut valve 70fr, and this pressure is applied to the side port 10 of the piston rod 102fr.
7, joins the upper chamber 105 in the inner cylinder 104, and further connects to the upper chamber 105 through the upper and lower through holes lO8 of the piston 103.
Join 6. A support pressure proportional to the product of this pressure and the cross-sectional area of the piston rod 102fr (square of rod radius x π) is applied to the piston rod 102fr. A lower chamber 106 of the inner cylinder 104 communicates with a lower space 110 of the damping valve device 109. The upper space of the damping valve device 109 includes the piston 1.
1 1 is divided into a lower chamber 112 and an upper chamber 113,
A lower space 110 is connected to the lower chamber 112 through a damping valve device 109.
The upper chamber 113 is filled with high pressure gas.

When the piston rod 102fr tries to relatively rapidly enter the lower part of the inner cylinder 104 due to the thrust upward movement of the front right wheel, the internal pressure of the inner cylinder 104 suddenly increases, and the pressure in the lower space l10 also increases to the lower chamber 112. The pressure will suddenly become higher than that of . At this time, the oil passes through the check valve of the damping valve system [109] that allows oil to flow from the lower space 110 to the lower chamber 112 at a predetermined pressure difference or higher, but blocks the flow in the opposite direction. 110 flows into the lower chamber 112, which causes the piston 111 to rise and buffer the propagation of 11171 (upward) applied from the wheels to the piston rond 102fr.
In other words, the propagation of wheel impact (upward thrust) to the vehicle body is buffered. When the piston rod 102fr relatively tries to escape above the inner cylinder 104 due to the sudden fall of the front right wheel, the internal pressure of the inner cylinder 104 suddenly decreases and the lower space 1
10 is about to suddenly become lower than the pressure in the lower chamber 112. At this time, the oil flows into the lower chamber through the check valve of the damping valve system [1109, which allows oil to flow from the lower chamber 112 to the lower space 1108 at a predetermined pressure difference or higher, but blocks the flow in the opposite direction. 112 to the lower space 110, which causes the piston 111 to descend, thereby preventing the propagation of the impulse II (downward) applied from the wheels to the piston rond 102fr. In other words, the propagation of wheel impact (downward movement) to the vehicle body is buffered.

In addition, shock absorber 101 is used to raise the vehicle height, etc.
As the pressure applied to fr increases, the lower chamber 112
The pressure increases, the piston 111 rises, and the piston 111 reaches a position corresponding to the vehicle body load. While parking, etc. When there is no vertical movement of the piston rod 102fr relative to the inner cylinder 104, there is virtually no oil leakage from the inner cylinder 104 into the outer cylinder 114 due to the seal between the inner cylinder 104 and the piston rod 102fr. However, in order to reduce the vertical movement load on the piston rond 102fr, the seal is designed to have a sealing characteristic that causes a slight oil leak when the piston rond 102fr moves up and down. The oil leaking into the outer cylinder 114 passes through the outer cylinder 114 to the drain 14fr (opened to the atmosphere).
It is returned to the reservoir 2 through the drain return pipe 2 (Fig. 1), which is a second return pipe. The reservoir 2 is equipped with a level sensor 28 (Fig. 1), and when the oil level in the reservoir 2 is below the lower limit, the level sensor 28 generates a signal (oil shortage signal) indicating this. The structures of the other suspensions 100f L, 100rr and 100r L are also similar to the suspension loo described above.
The structure is substantially similar to that of fr.

Figure 3 shows an enlarged longitudinal section of the 80fr pressure control well. A spool storage 6 is opened in the center of the sleeve 81, and a line pressure port 82 is provided on the inner surface of the spool storage 6.
A ring-shaped groove 83 through which the low-pressure port 85 communicates, and a ring-shaped groove 86 through which the low-pressure port 85 communicates are formed. An output port 84 is opened between these ring-shaped rings 1183 and 86. The spool 90 inserted into the spool storage 6 has a ring-shaped groove 9l having a width corresponding to the distance between the right edge of the groove 83 and the left edge of the groove 86 in the middle of its side circumferential surface. A valve housing 6 is provided at the left end of the spool 90, and this valve housing 6 communicates with the groove 9l. The valve storage 6 has
A valve body 93 pushed by a compression coil spring 92 is inserted. This valve body 93 has a through orifice in the center, and this orifice allows the space of the groove 91 (output port 8
4) and. The valve body 93 and the entire chamber housing the compression coil spring 92 are in communication. Therefore, spool 9
0 receives the pressure of the output port 84 (regulated pressure to the suspension 100fr) at its left end,
This causes it to receive a force that drives it to the right. Note that when the pressure of the output port 84 becomes shockingly high, the valve body 93 moves to the left against the pushing force of the compression coil spring 92, creating a buffer space at the right end of the valve body 93. , when the output port 84 rises impulsively, this impulsive rising pressure is not immediately applied to the left end surface of the spool 90;
The valve body 93 has the effect of buffering the rightward movement of the spool 9o against a shocking pressure increase in the output port 84.
Conversely, it has the effect of buffering the leftward movement of the spool 90 against an impactful pressure drop at the output port 84. The pressure of the target pressure space 88 communicating with the high pressure port 87 via the orifice 88f is applied to the right end surface of the spool 90, and due to this pressure, the spool 90 receives a force that drives it to the left. Line pressure is supplied to the high pressure port 87, but the target pressure level 88 is communicated with the low pressure port 89 through the communication port 94, and the communication opening degree of the communication port 94 is set to 21 Valve 95 determines. When the two dollar valve 95 closes the communication port 94, the high pressure port 8
The pressure in the target pressure space 88 communicating with the high pressure port 87
pressure (line pressure), and the spool 90 is driven to the left. As a result, the groove 91 of the spool 90 communicates with the groove 83 (line pressure port 82), and the groove 91 (output port 84)
) increases, this is transmitted to the left side of the valve body 93, and applies a rightward driving force to the left end of the spool 90. twenty-one dollar valve 9
5 fully opens the communication port 94, the target pressure space 88
The pressure of the spool 90 is narrowed by the orifice 88f, so it is significantly lower than the pressure (line pressure) of the high pressure port 87, and the spool 90 moves to the right. communicates with groove 9
1 (output port 84) decreases, and this causes the valve body 93 to
is transmitted to the left, and the rightward driving force at the left end of the spool 90 decreases. In this way, the Subur 90 can control the target pressure space 8
This is the position where the pressure at 0 and the pressure at the output port 84 are balanced. That is, a pressure substantially proportional to the pressure in target pressure space 88 appears at output port 84 . Target pressure space 88
The pressure of the 21 dollar valve 95 is determined by the position of the 21 dollar valve 95, and this pressure is substantially inversely proportional to the distance of the 21 dollar valve 95 with respect to the flow port 94. A pressure appears which is essentially inversely proportional to the distance.

The twenty-one dollar valve 95 is pushed to the left by a rond penetrating a fixed core 96 of magnetic material. The right end of the fixed core 96 has a truncated conical shape, and the magnetic plunger 9 is attached to this right end surface.
The end faces of the round hexagonal shape with the bottom of 7 are facing each other. twenty-one dollar valve 9
The rod that pushes 5 to the left is fixed to this plunger 97. The fixed core 96 and plunger 97 are inserted into the bobbin around which the electric coil 99 is wound.

When the electric coil 99 is energized, a magnetic flux flows through the loop of the fixed core 96-1, the magnetic yoke 98a, the magnetic end plate 98b, the plunger 97, and the fixed core 96, and the plunger 97 is attracted to the fixed core 9G and moves to the left. 6, the twenty dollar valve 95 approaches the flow path 94 (the distance becomes shorter).
The left end of the 21 dollar valve 95 receives the pressure of the target pressure space 88 as the right driving force, and the right end of the 21 dollar valve 95 is at atmospheric pressure through the low pressure port 98c that is released to the atmosphere. Due to the pressure in the target pressure space 88, a rightward driving force corresponding to the pressure value (this corresponds to the position of the twenty-one dollar valve 95) is received, and as a result, the twenty-one dollar valve 95 moves toward the flow port 94.
The distance is substantially inversely proportional to the current value flowing through the electric coil 99. In order to make the relationship between current value and distance linear, one of the fixed core and the plunger is shaped like a truncated round pin, and the other is shaped like a round hole with a corresponding bottom. As a result of the above, a pressure substantially proportional to the current value flowing through the electric coil 99 appears at the output port 84. This pressure control well 80fr outputs a pressure proportional to the current within a predetermined range to the output port 84. electric coil 99
By changing the energizing current value, the vehicle height can be raised or lowered by 31
It can be useful. Fig. 4 shows an enlarged longitudinal section of the cut valve 70fr.
A line pressure port 72, a pressure regulation input port 73, an oil drain port 74, and an output port 75 communicate with a valve housing 6 opened in the valve base 71. Line pressure port 7
2 and the pressure regulation input port 73 is a ring-shaped first guide 7.
The pressure regulating input port 73 and the output port 75 are separated by a cylindrical guide 77a having a circular communication port 77ao in the center. The oil drain port 74 is the second
It communicates with a ring-shaped groove on the outer periphery of the guide 77c, and returns oil leaked to the outer periphery of the second guides 77a, 77b, and 77c to the return pipe line 11.

A spool 78 pushed leftward by a compression coil spring 79 passes through the first and second guides 76, 77a to 77c. The left end head of the spool 78 passes through a backup ring 76b in an airtight manner. backup ring 7
6b passes through the O ring 76o and is inserted into the valve guide opening of the second guide 76 together with the O ring 76o. O ring 76o connects backup ring 76b and second guide 7
6 is sealed. The space to the left of the left end of the spool 78 in the valve guide opening of the second guide 76 is a control pressure chamber 72.
a, and communicates with the line pressure port 72 through a groove carved in the left end surface of the second guide 76. therefore,
Pressure from the line pressure port 72 is applied to the left end surface of the spool 78. The surface of the spool 78 facing the opening 77ao of the second guide 77a is a spherical surface 78a, and when the spool 78 moves to the left, the spherical surface 78a closes the opening 77ao, as shown in FIG. The input port 73a and the output port 75 are cut off. The second guide 77c has a central protrusion 77dP having a guide six 77dh for receiving the tail end of the subur 78, a communication port 77ds that allows communication between the inner space of the second guide 77b and the output port 75, and a bottom hole 77dr. The bottom of the guide six 77c communicates with the oil drain port 74 through a side port. This guide hole 77c
The leg of the Subur 78 is inserted into the leg, and the O-ring 77dO attached to this leg seals between the leg and the inner wall surface of the guide hole 77c, and the fluid of the second guide 77b passes through the guide hole 77dh. This prevents the oil from flowing into the drain port 77dh that communicates with the return pipe 11. When the line pressure is less than a predetermined low pressure, as shown in FIG.
3, the spherical surface 78a of the spool 78 is connected to the second guide 77.
This is blocked by completely closing the circular opening 77ao of a. When the line pressure exceeds a predetermined low pressure, this pressure starts to drive the spool 79 to the right against the repulsive force of the compression coil spring 79, and the spool 79 is positioned at the rightmost position (fully opened) at a pressure higher than the predetermined low pressure. ．． That is, the spherical surface (78a) of the spool 78 is the second guide 77a.
Move to the right from the circular opening 77aO of the pressure regulation input port 7.
3 communicates with the output port 75, and when the line pressure (line pressure port 72) rises to a predetermined low pressure, the cut valve 70
fr is. Pressure regulator caboto 73 (pressure regulation output of pressure control well 80fr) and output port 75 (shock absorber 101f
r), and when the line pressure (port 72) further increases, the pressure regulation input port 73 (pressure control well 80f
(pressure regulation output of r) and the output port 75 (shock absorber 101fr) is fully opened.

When the line pressure decreases, the opposite is true, and when the line pressure falls below a predetermined low pressure, the output port 75 (shock absorber 101fr) is completely cut off from the pressure regulation input port 73 (pressure regulation output of the pressure control well 80fr). Ru. That is, the pressure in the control pressure port 72 decreases, and the force of the compression coil spring 79 causes the spool 78 to move to the left (
When the spool 78 is driven in the blocking direction), the spherical surface 78a of the spool 78
comes into contact with the opening edge of the circular opening 77ao of the second guide 77a. At this time, the spherical surface 78a hits the circular edge of the circular opening 77ao, and since the spherical surface 78a is inclined from a position far from the opening 77ao to a point close to the opening 77ao, the entire circumference of the spherical surface 78a is initially the entire circumference of the opening edge. If it does not contact the circumference exactly, the contact part will cause the Subur 78 to move (left and right).
A force is applied to align the axis of the direction with the center of the opening 77ao,
This is connected to the backup ring 76b via the spool 78.
and acts on O-ring 76o. Since the O-ring 76o is elastic, the portions to which this force is applied contract and the other portions expand, allowing displacement of the Subur 78 in the direction in which the force is applied while maintaining sealing performance. As a result, the entire circumference of the spherical surface 78a comes into close contact with the circular opening 77ao, and the input port 73 and the output port 75 are completely cut off. Since the backup ring 76b is displaced together with the spool 78, the sliding resistance between the backup ring 76b and the spool 78 does not substantially change, so that the spool 78 moves smoothly. Figure 5 shows an enlarged longitudinal section of a 60fr relief valve. An input port 62 and a low pressure port 63 are open in the valve housing 6 of the valve base 61. A cylindrical first guide 64 and a second guide 67 are inserted into the valve housing 6, and the input port 62 is inserted through a filter 65. It communicates with the inner space of the first guide 64. A valve body 66 having an orifice in the center is inserted into the first guide 64, and the valve body 66 is pushed leftward by a compression coil spring 66a. The space in the l-th guide 64 that accommodates the valve body 66 and the compression coil spring 66a is
6 through the orifice of the second guide 6, and communicates with the input port 62 through the opening of the spring seat 66b.
It communicates with the inner space of 7. The conical valve body 68 is pushed to the left by the repulsive force of the compression coil spring 69, and the spring seat 68 is pushed to the left by the repulsive force of the compression coil spring 69.
The opening of 6b is closed. Pressure at input port 62 (
When the control pressure (control pressure) is less than a predetermined high pressure, the pressure in the storage space of the coil spring 66a, which communicates with the input port 62 through the orifice of the valve body 66, is applied to the compression coil spring 6.
Since the repulsion force of the valve body 68 is relatively lower than that of the fifth
As shown in the figure, the central opening of the valve seat 66b is closed,
Therefore, the output port 62 is connected to the low pressure ports 63 and 66.
It is cut off from the inner space of the second guide 67, which communicates through 7a. That is, the output port 62 is cut off from the low pressure port 63. When the pressure (control pressure) of the input port 62 rises to a predetermined high pressure, this pressure is applied to the center opening of the valve seat 66b through the orifice of the valve body 66, and the valve body 6B begins to be driven to the right by this pressure, and the input port 62
When the pressure further increases, the valve body 68 is driven to the rightmost position. That is, the pressure at the input port 62 is lower than the pressure at the low pressure port 6.
3, and the control pressure is suppressed to below a predetermined high pressure level. Note that if high pressure is applied to the input port 62, The valve body 66 is driven to the right, and the input port 62 is connected to the first guide 6.
It communicates with the valve storage space of the base body 61 through the side port 64a of 4 and communicates with the low pressure port 63, and because this flow path area is large, the pressure of the output port 62 suddenly increases (pressure increase m!).
is buffered. FIG. 6 shows an enlarged longitudinal section of the main check valve 50. An input port 52 and an output port 53 communicate with a valve housing 6 opened in the valve base 51. A cylindrical valve seat 54 with a bottom is housed in the valve housing 6, and a ball valve 57 pushed by a compression coil spring 56 closes a communication port 55 of the valve seat 54. When the pressure is higher than the pressure at the output port 53, the ball valve 57
is pushed to the right by the pressure of the input port 52 and opens the magic port 55. That is, oil flows in the direction from the input port 52 to the output port 53. However, when the pressure at the output port 53 is higher than the pressure at the input port 52, the ball valve 57 closes the communication port, so that no oil flows from the output port 53 to the input port 52. FIG. 7 shows an enlarged longitudinal section of the bypass valve 120.
The input port 121 that communicates with the high pressure pipe line 9 communicates with the inner space (spool operating space) of the first guide 123,
A valve body 124a pushed to the left by a compression coil spring 124b is housed in the inner space. This valve body 12
4a has a communication port 124C in the center of the left end surface, and the input port 121 communicates with the inner space of the first guide 123 through the communication port 124c. The inner space has a communication port 1
22b, it communicates with the low pressure port 122 that communicates with the return pipe 1l, but the flow rate of the low pressure side opening of this communication port 122b is such that the flow rate of the 21 dollar valve 125 opposite to the low pressure side opening is
It is defined by 21 dollar valve 125 and fixed core 126 to electric coil 12
The combination with the solenoid consisting of 9 is the same as the combination of the 21 dollar valve 95 shown in FIG. be.

The force of pushing the twenty-one dollar valve 125 toward the communication port 122b is substantially proportional to the current value of the electric coil 129. From the input port 121, through the communication port 124C, through the spool operating space, and further through the communication port 122b to the low pressure port 12.
Due to the fluid pressure (relief pressure) flowing out to the 21 dollar valve 125, the 21 dollar valve 125 receives a force to the right (retreat direction).
5 is the force due to this relief pressure and the solenoid (126 to 1
29) moves to a position where the pushing force (left: advance direction) is balanced. When the pressure at the input port 121 increases, the force due to the relief pressure increases and the
25 is retracted and the relief flow rate through the flow port 122b increases, thereby suppressing the pressure rise in the input port 121, and the pressure in the input port 121 becomes lower than the relief pressure determined by the solenoid current. As a result, the pressure at the input port 121 becomes substantially proportional to the value of the current flowing through the electric coil 129. This bypass valve 12
0 means that the pressure (line pressure) at the input port 121 is proportional to the applied current within a predetermined range. Also,
Ignition switch is off (engine stopped: Bonp 1
When the electric coil 129 is de-energized, the twenty dollar valve 125 moves to the rightmost position, and the input port 12l (line pressure) becomes a low pressure near the return pressure. 21 dollar valve at the upper end of the range 125
When the twenty-one dollar valve 125 reaches the retraction (rightward) side limit of the predetermined range while applying the maximum pushing force to the input port 121, the compression coil spring 124 is
b is compressed and the spool 124a is retracted (to the right)
, the low pressure port 122a communicates with the input port 121, and the pressure of the input port 121 changes to the low pressure port 122a.
Exit to. Since the low pressure port 122a has a relatively large opening, abnormally high pressure in the input port 21 immediately escapes to the low pressure port 122a. That is, the spring force of the compression coil spring 124b is set to a relatively strong spring force corresponding to the upper limit of the input pressure at which the twenty-one dollar valve 125 performs an effective relief operation within the planned energization range of the solenoid current. For example, the relief pressure (
When adjusting and setting the pressure in the high-pressure pipe line from the low side A to the high side B, when a pressure of B or more is applied to the input port 121, the compression coil spring 124b
is compressed and the Subur 124a moves in the retracting direction, making the low pressure port 122a communicate with the input port 121.
At pressures below B, the compression coil spring 124
b is substantially uncompressed, and the subur 1.24a isolates the low pressure port 122a from the input port 121, as shown in FIG.

Therefore, when the pressure in the high pressure pipe 9 is within the normal pressure range, the pressure in the input port 121 is maintained at a certain pressure corresponding to the solenoid current by the relief operation of the twenty dollar valve 125, and the spool 1 24a does not move. . When abnormally high pressure is applied to input port l21, spool 1
24a moves away. As a result, the frequency of movement of the spool 124o is extremely low, and accordingly, the probability that the spool will catch foreign objects or particles in the fluid is low, and it will not stick. The twenty-one dollar valve 125 faces the low-pressure side opening of the flow port 122b, and there is no possibility that foreign matter or debris will become stuck between the valve and the opening. Relief Vanoleb 60- is the aforementioned Relief Vanoleb 6.
It has the same structure as 0fr, but has a conical valve body (6
8: The compression coil spring (69) pushing the
The spring force is said to be a little small, and the input port (6
2) pressure (pressure at high pressure port 3), the relief valve 60fr transfers the pressure at its input port 62 to the low pressure port 63.
When the pressure is less than the predetermined high pressure, which is slightly lower than the pressure to be released to the
). When the pressure at the input port (62) exceeds a predetermined high pressure, the valve body (68) is driven to the rightmost direction. That is, the pressure in the input port (62) is released to the low pressure port (63), and the pressure in the high pressure port 3 is suppressed to a predetermined high pressure or less. With the above structure, in the vehicle body support device shown in FIG. Prevent it. The relief valve 60w+ suppresses the pressure of the high pressure port 3, that is, the pressure of the high pressure supply pipe 8, to a predetermined high pressure or less, and when the pressure of the high pressure port 3 rises impulsively, it is released to the return pipe l1, and the high pressure supply pipe 8
buffers the propagation of impulsive pressure to the The bypass valve 120 substantially linearly controls the pressure in the rear wheel high pressure supply pipe 9 within a predetermined range, and maintains the pressure in the rear wheel high pressure supply pipe 9 at a predetermined constant pressure during normal operation. This constant pressure control is performed by controlling the current value of the bypass valve 120 with reference to the pressure detected by the pressure sensor 1.3rv. In addition, when there is a shocking pressure increase in the rear axle suspension, it is released to the return pipe 1l and the high pressure supply pipe 8
buffer the propagation to. Furthermore, when the ignition switch is open (engine stopped: bomb l stopped), the current is cut off, the rear wheel high pressure supply pipe 9 is passed through the return pipe 11, and the rear wheel high pressure supply pipe 9 (high pressure supply pipe 8 ) to release the pressure. Pressure control valve 80fr, 80f L, 80rr, 80r
L is set so that the required support pressure is applied to the suspension by suspension pressure control. lt air coil (99
) is controlled, and the required support pressure is output to the output port (84). When impact pressure from the suspension propagates to the output port (84), it is buffered to suppress disturbances in the pressure control spool (9l) (disturbance in the output pressure). In other words, the required pressure is stably applied to the suspension.

Cut Vanoleb 70fr, 70f L, 70rrjO
r L is line pressure (front wheel high pressure supply pipe 6, rear wheel high pressure supply pipe 9
) is less than a predetermined low pressure, the suspension supply pressure line (between the output port 84 of the pressure control valve and the suspension) is shut off to prevent pressure from being released f-1 from the suspension, and the line pressure is lower than the predetermined low pressure. When , the supply pressure line is fully open to flow. This automatically prevents an abnormal drop in suspension pressure when line pressure is low.

Relief valve 60fr, 60f L, 60rr, 6
0rL limits the pressure (mainly suspension pressure) in the suspension supply pressure line (between the output port 84 of the pressure control valve and the suspension) to less than the high pressure upper limit, and prevents wheel thrusting or when heavy objects are loaded. When there is a shocking pressure increase in the supply pressure line (suspension) due to injection, etc., this pressure is released to the return pipe II to alleviate the impact on the suspension, and also to reduce the pressure on the hydraulic line connected to the suspension and the mechanical elements connected to it. Improves durability. [Effects of the Invention] As described above, according to the cut valve of the present invention, the pressure in the control pressure port (72) decreases (increases), and as a result, the valve member (78) is moved in the shutoff direction by the force of the spring member (79). When the valve member (78) is driven, the centering surface (78a) of the valve member (78) opens a circular opening between the space communicating with the input port (73) and the space communicating with the output port (75), which communicates with both spaces. (7
7ao). At this time, the valve member (78
The alignment surface (78a) of ) hits the circular edge of the opening (77ao), and the alignment surface (78a) is inclined from a position far from the opening (77ao) to a point close to the opening (77ao). If the entire circumference of the alignment surface (78a) does not come into perfect contact with the entire circumference of the green opening at first, the contact portion will force the valve member (78) to align its axis in the direction of movement with the center of the opening (77ao). acts on the backup ring (76b) and the second sealing material (76o) via the valve member (78).

Since the l-th sealing material (76o) is elastic, the portions to which this force is applied contract, and the other portions expand, maintaining the sealing properties of the valve member (78) in the direction on which the force acts. Allow displacement to . As a result, the entire circumference of the alignment surface (78a) comes into close contact with the circular opening (77ao), and the input port (73) and output port (75) are completely cut off. The backup ring (76b) is the valve member (78)
Since the sliding resistance between the backup ring (76b) and the valve member (78) does not substantially change, the movement of the valve member (78) becomes smooth. Therefore, even if the supporting surfaces of the valve member (78> and the first and second support members (77dp and 76) that support it are machined with relatively low precision, the cut valve can be shut off smoothly and completely. It is done.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a suspension pressure supply system incorporating an embodiment of the present invention. Figure 2 shows the first
It is an enlarged vertical cross-sectional view of the suspension 100fL shown in the figure. FIG. 3 is an enlarged longitudinal sectional view of the pressure control valve 80fL shown in FIG. 1. FIG. 4 is a drawing showing one embodiment of the present invention, and is an enlarged vertical sectional view of the cut valve 70fL shown in FIG. 1. FIG. 5 is an enlarged longitudinal sectional view of the relief valve 60fL shown in FIG. 1. FIG. 6 is an enlarged vertical sectional view of the main check valve 50 shown in FIG. FIG. 7 is an enlarged longitudinal sectional view of the bypass valve 120 shown in FIG. 1. 1: Bomb 2: Reservoir 3: High pressure port 4: Accumulator 6: Front wheel high pressure supply pipe 7
: Accumulator 8: High pressure supply pipe 9: Rear wheel high pressure supply pipe lO: Accumulator 11; Reservoir return pipe 12: Drain return pipe 13f L,
13fr, 13r L, 13rr, 13rm
, 13rL: Pressure sensor 14k, 14fr, 14
rL, 14rr: Drain of atmospheric release 15fL, 15
fr, 15rL, 15rr: Vehicle height sensor 16p: Vertical acceleration sensor 16r: Lateral acceleration sensor 17:
Microprocessor l8 Two microprocessors 19: Hattery 20: Ignition switch 21: Constant voltage power supply circuit 22: Relay 23 Two backup power supply circuits 24: Brake lamp 25: Vehicle speed synchronization pulse generator 26: Rotary encoder 27: Absolute encoder 28: Scene Detection switch 291-293: A/D
Converters 301 to 303: Signal processing circuit 31:
Low-pass filter 32; duty controller
33: Coil driver 34: Input/output circuit
50: Main check valve 51: Valve base 52: Input port 53: Output port 54: Valve seat 55: Flow port 56: Compression coil spring 57: Ball valve 60fr 60fL60rr, 60rL: Relief valve 61: Valve base 62: Input port 63
:Low pressure port 64:First guide 65:Filter
66: Valve body 67: Second guide 68: Valve body 69: Compression coil spring 71: Valve base 72: Line pressure port 72a: Control pressure chamber 73
: Pressure adjustment input port 74: Wandering oil port 75: Output port 76: First guide 76b: Backup ring 760: ○ ring 77: Guide 77a
;Second guide 77ao: Circular opening 77dρ: Central protrusion 77dh: Valve guide hole 77do: O-ring 77ds: Communication port 77dr: Bottom hole 7
8: Subur 78a: Spherical surface 79: Compression coil spring 80fr, 80f L, 80rr, 80r L: Pressure 81: Sleeve 82: Line pressure port 83:
Groove 84: Output port 85: Low pressure port 86:
Groove 87: High pressure port 88: Target pressure space 88f
: Orifice 89: Low pressure port 90: Spool
9H groove 92: Compression coil spring
93: Valve body 94: Flow port 95: Twenty-one dollar valve
96: Fixed core 97: Plunger 98a: Yoke
98b; End plate 98c: Low pressure port 99: Electric coil 100fr 100fL100rr, 100rL:
Suspension 10tfr 10tk IQlrr 1
01rL: Shock absorber 102fr, 102fl
, 102rr, 102rL: Piston rod 103: Piston 104: Inner cylinder 105: Upper chamber 10
6: Lower chamber 107: Side port 108 Two upper and lower through holes 109; Valve damping valve device 110: Lower space
111: Piston 1l2: Lower chamber l13: Upper chamber 114: Outer cylinder 12 inches A A: lA) Ii
i121: input port 122=
Low pressure port 122a: Low pressure port! 22b, 12
4c: Communication port 123: First guide 124a: Valve body 124b: Compression coil spring 125
:21 dollar valve 129; electric coil

Claims (1)

[Scope of Claims] Input port; Output port; A partition member having a circular opening between a space communicating with the input port and a space communicating with the output port and communicating with both spaces; Opposing the circular opening and having the opening. a control pressure port communicating with a control pressure space that applies pressure to one side of the valve member; a control pressure port that communicates with a control pressure space that applies pressure to one side of the valve member; A spring member that applies a force to the valve member in a direction opposite to the force applied to the one surface of the member: The pressure in the control pressure space moves in a direction in which the force applied to the one surface of the valve member and the force of the spring member are opposite to each other. a first support member that freely supports the valve member via a first sealing material; a first support member that freely supports the valve member via a first sealing material; The valve member is
A cut valve comprising: a movably coupled backup ring; and a second support member that supports the backup ring via an elastic second sealing material.