JP5598706B2 - Relief valve - Google Patents

Description

  The present invention relates to a relief valve, and more particularly to a relief valve capable of changing a valve opening pressure used for adjusting hydraulic pressure of an engine lubrication system.

  When the pressure in the hydraulic circuit becomes equal to or higher than a set pressure, the relief valve suppresses an increase in pressure in the hydraulic circuit by opening an excess oil relief passage provided in the relief valve.

  This type of relief valve is, for example, a body, a valve, a spring, a retainer, a plug, an oil passage for introducing oil between the retainer and the plug, and a back pressure control valve for controlling oil introduction, as in Non-Patent Document 1. Composed.

  In this relief valve, when oil is not introduced between the retainer and the plug, the retainer is positioned at the plug end face and the spring length is set longer, and the oil discharged by the oil pump is more upstream in the oil flow direction than the relief valve. The valve opening pressure required for relief to the side is set to a low pressure. On the other hand, when oil is introduced between the retainer and the plug, the retainer rises to contract the spring, and the valve opening pressure is set to a high pressure.

Published technical report 2006-505946

In the case of the relief valve of Non-Patent Document 1, when the valve opening pressure is set from high pressure to low pressure, the retainer descends and comes into contact with the plug, or the valve vibrates in small increments due to fluid pulsation caused by oil pump discharge. As a result, various abnormal sounds may occur due to contact with the body.
Accordingly, an object of the present invention is to provide a relief valve that is unlikely to cause such abnormal noise.

  The first feature of the relief valve according to the present invention is a valve body having a first port through which a fluid flows and a second port through which the fluid is discharged, and the valve so as to be able to move close to or away from the first port. A sleeve housed in the body and having an inflow port communicating with the first port and a discharge port communicating with the second port; and being accommodated in the sleeve so as to be movable toward or away from the first port; A valve that prohibits communication between the inlet and the outlet by moving to one port side, and that connects the inlet and the outlet by moving in a direction away from the first port; An urging member for urging the sleeve and the valve toward the first port; and a valve position changing machine for changing a relative position between the valve body and the sleeve and the valve. The first port and the second port are in direct communication with each other when the sleeve receives the fluid pressure of the fluid flowing through the first port and moves in a direction away from the first port. It is in.

[Action and effect]
In this configuration, when the sleeve receives the fluid pressure of the fluid flowing through the first port and moves in a direction away from the first port, the fluid flows directly from the first port to the second port. ing.
Since the fluid pressure received by the sleeve is reduced when the fluid flows directly from the first port to the second port, the separation movement of the sleeve from the first port causes the balance between the biasing force of the biasing member and the fluid pressure. It will stop at the position where it can be removed.
As a result, contact between the sleeve and the valve body is avoided, so that generation of abnormal noise can be prevented.

  The second characteristic configuration is that the valve position changing mechanism moves the fluid pressure of the fluid flowing through the first port in the same direction as the urging direction of the urging member by acting on the sleeve.

[Action and effect]
Thus, in order to change the relative position of the valve body, the sleeve, and the valve, the fluid pressure of the fluid flowing through the first port is applied to the sleeve, so no additional power is required to move the sleeve, The relief valve structure can be simplified. Moreover, since the sleeve is moved in the same direction as the urging direction of the urging member, the fluid pressure of the fluid flowing through the first port and the urging force of the urging member can be efficiently applied to the sleeve.

According to a third characteristic configuration, when the valve position changing mechanism is operated, the fluid is discharged from the discharge port by causing the fluid pressure of the fluid to act on the valve at a level equal to or higher than the first valve opening pressure. When not operating, the sleeve is moved in a direction away from the first port by causing the fluid pressure of the fluid to act on the sleeve at a second valve opening pressure or higher, so that the first port and the second port are separated from each other. The fluid is discharged from the first port to the second port, and the second valve opening pressure is higher than the first valve opening pressure.

[Action and effect]
With this configuration, when the valve position changing mechanism is operated, a low pressure setting is made so that the fluid pressure of the fluid in the valve is equal to or higher than the first valve opening pressure, and when the valve position changing mechanism is not operated, the fluid of the fluid in the valve When the pressure is equal to or higher than the second fluid pressure, which is a fluid pressure higher than the first valve opening pressure, a high pressure setting is performed to relieve. In this way, it is possible to easily change the setting of the valve opening pressure in the relief valve.

A fourth characteristic configuration is that the valve and the sleeve move integrally when the valve position changing mechanism is not in operation.

[Action and effect]
According to this configuration, since the valve and the sleeve move integrally, it is possible to prevent the generation of contact noise between the valve and the sleeve caused by fluid pulsation when the valve position changing mechanism is not operated, and the sleeve There is also an effect of reducing wear between the valve and the valve.

In the fifth characteristic configuration, one end face of the both end faces of the sleeve faces the first port, the other end face faces the flow path of the valve position changing mechanism, and the area of the other end face Is set to be larger than the area of the one end face.

[Action and effect]
With this configuration, when the hydraulic pressure of the first port is applied to the other end face, the fluid pressure acting on the other end face is larger than the pressing force due to the fluid pressure acting on one end face due to the difference in area of both end faces. As a result, the pressing force becomes larger, and the sleeve can be reliably positioned on the first port side with a simple configuration.

In the sixth feature configuration, on the outer peripheral surface of the sleeve, a sliding surface with the valve body is formed at both end portions of the sleeve, and the sliding surface is formed at a portion sandwiched between the both end portions. There is no point.

[Action and effect]
The sleeve of this configuration is changed in position using, for example, the fluid pressure of the first port. Therefore, it is desirable that the sliding resistance with respect to the valve body is as small as possible. Therefore, by distributing the sliding surface with the valve body to the vicinity of both ends of the sleeve, the area of the sliding surface during sliding is reduced, and the inclination of the sleeve is kept to a minimum. The generated frictional force is minimized.

In the seventh characteristic configuration, the sleeve is provided with a first communication hole for discharging the fluid or air inside the sleeve, the fluid or air on the opposite side to the first port side across the valve. There is a point.

[Action and effect]
With this configuration, when the position of the sleeve is changed by the valve position changing mechanism, the volume of the fluid or air on the side opposite to the first port side of the fluid or air inside the sleeve is increased or decreased across the valve. . At that time, by discharging the fluid or air on the opposite side, the fluid can freely enter and exit, and the resistance when the sleeve moves can be reduced.

The eighth feature is that the valve is provided with a second communication hole for discharging the fluid or air inside the sleeve out of the fluid or air on the opposite side of the first port across the valve. There is a point.

[Action and effect]
With this configuration, when the valve is pushed down by the fluid pressure from the first port, the fluid or air on the opposite side of the first port across the valve becomes a resistance. Therefore, the fluid or air communicates with the second port to facilitate the discharge of the fluid or air, thereby smoothing the valve operation.

It is a figure which shows the closed state in the low pressure setting of the relief valve which concerns on this invention. It is a figure which shows the open state in the low pressure setting of the relief valve which concerns on this invention. It is a figure which shows the closed state in the high pressure setting of the relief valve which concerns on this invention. It is a figure which shows the open state in the high pressure setting of the relief valve which concerns on this invention. It is a cross-sectional view of the relief valve according to the present invention. It is a figure which shows the closed state in the high pressure setting of the relief valve which concerns on this invention. It is a figure which shows the open state in the high pressure setting of the relief valve which concerns on this invention. It is a figure which shows other embodiment of the relief valve which concerns on this invention. It is a figure which shows other embodiment of the relief valve which concerns on this invention.

Hereinafter, as an embodiment of the present invention, a relief valve 1 that controls the pressure of a supply passage 10 that supplies oil to an engine will be described with reference to the drawings.
Embodiment

  As shown in FIGS. 1 to 7, in the engine operating state, the oil pump 20 sucks out the fluid (oil) stored in the oil pan 21 and directs it to each lubricated member using the supply flow path 10. And send it out.

  The relief valve 1 includes a valve body 2, a cylindrical sleeve 4 accommodated in the valve body 2, a valve 5 accommodated in the sleeve 4, and a biasing member that applies a biasing force to the sleeve 4 and the valve 5. 6 (for example, a spring spring) and disposed in the path of the supply flow path 10.

  The valve body 2 includes a first port 11 into which a fluid flows, a second port 12 through which the fluid is discharged, an inner hole 2a that accommodates the sleeve 4, and a flow path 2b that connects the inner hole 2a and an OSV 15 described later. And have.

  The sleeve 4 includes an inflow port 7 that communicates with the first port 11, a discharge port 8 that communicates with the second port 12, and an inner hole 4 c that accommodates the valve 5. The inner hole 4c is formed with a locking portion 4e capable of locking the locked portion 5b of the valve 5. As shown in FIG. 5, the discharge ports 8 of the sleeve 4 are provided at four locations at intervals of 90 degrees in plan view.

  The sleeve 4 is fitted and inserted so as to be able to move close to or away from the first port 11 while sliding in the inner hole 2 a of the valve body 2, and moves to the first port 11 side by moving to the first port 11 side. And communication with the second port 12 is prohibited. The lower portion of the sleeve 4 is slidably fitted to a protrusion 16 provided at the lower end of the inner hole 2a of the valve body 2.

A locked portion 5 b that can be locked to the locking portion 4 e of the sleeve 4 is provided on the end surface of the valve 5 on the first port side 11.
The valve 5 is fitted and inserted so as to be able to move close to or away from the first port 11 while sliding in the inner hole 4c of the sleeve 4. The communication with the outlet 8 is prohibited, and the inflow port 7 and the discharge port 8 are made to communicate with each other by moving in a direction away from the first port 11 (downward in FIG. 1 and FIG. 2).

  The biasing member 6 is configured to bias the sleeve 4 and the valve 5 in a direction against the fluid pressure from the first port 11 (on the first port 11 side).

  As shown in FIGS. 5 to 7, the second ports 12 are provided in a pair, i.e., two locations symmetrically with respect to a plane including the central axis of the inner hole 2 a of the valve body 2. As shown in FIG.6 and FIG.7, the cross-sectional shape of the two 2nd ports 12 is formed in the substantially trapezoid.

  As shown in FIGS. 1 and 2, the relief valve 1 includes a valve position changing mechanism 13 that changes the relative position of the sleeve 4 with respect to the valve body 2. The valve position changing mechanism 13 is branched from the supply flow path 10 and connected to the side opposite to the first port 11 side of the sleeve 4 (hereinafter referred to as the anti-first port 11 side). And the OSV 15 that is provided in the path of the back pressure flow path 14 and turns on and off the action of the fluid pressure of the first port 11.

  When the OSV 15 is turned ON, as shown in FIGS. 1 and 2, the fluid in the supply flow path 10 is introduced from the back pressure flow path 14 to the side opposite to the first port 11 of the sleeve 4. The fluid pressure of the first port 11 acts in a direction against the fluid pressure from the first port 11.

  On the other hand, when the OSV 15 is turned OFF, the fluid in the supply flow path 10 is introduced from the back pressure flow path 14 to the anti-first port 11 side of the sleeve 4 as shown in FIGS. As a result, the fluid pressure of the first port 11 does not act on the sleeve 4 in the direction against the fluid pressure from the first port 11.

  Of the both end faces 4A, 4B of the sleeve 4, one end face 4A faces the first port 11 and the other end face 4B faces the flow path 2b connected to the back pressure flow path 14 of the valve position changing mechanism 13. . Here, the area of the end face 4B is set larger than the area of the end face 4A. Thus, when the hydraulic pressure of the first port 11 is applied to the other end surface 4B, the other end surface 4B is compared with the pressing force applied to the one end surface 4A due to the difference in area between the both end surfaces 4A and 4B. Thus, the pressing force acting on the sleeve 4 becomes larger, and the sleeve 4 can be positioned on the first port 11 side. Therefore, the sleeve 4 can be positioned on the first port 11 side or the second port 12 side (the side opposite to the first port 11) by turning on / off the OSV 15.

(When the valve position change mechanism is activated during normal operation)
As shown in FIGS. 1 and 2, when the OSV 15 is turned on, the fluid pressure of the first port 11 acts on the sleeve 4 in a direction against the fluid pressure from the first port 11, and the sleeve 4 is moved to the first state. It is moved in the direction of approaching the port 11. As the sleeve 4 approaches the first port 11, the position of the discharge port 8 also approaches the first port 11 side.

  Furthermore, since the valve 5 as well as the sleeve 4 is urged by the urging member 6 and is positioned on the first port 11 side, the urging member 6 is in an extended state. The urging member 6 in the extended state is easily pushed back to the side opposite to the first port 11. Therefore, even if the fluid pressure in the supply flow path 10 is low, the biasing member 6 is pushed back to the first port 11 side as shown in FIG. The discharge port 8 of the sleeve 4 is opened.

  Thus, the first port 11 and the second port 12 communicate with each other, and excess fluid (oil) returns to the suction port of the oil pump 20. That is, in this case, the valve opening pressure of the relief valve 1 is set to a low pressure (first valve opening pressure). In other words, when the OSV 15 (valve position changing mechanism 13) is operated, the fluid is discharged from the discharge port 8 by causing the fluid pressure of the fluid to act on the valve 5 at the first valve opening pressure or higher.

  Here, the first valve opening pressure refers to a fluid pressure necessary for communicating the inlet 7 and the outlet 8 of the sleeve 4 when the OSV 15 (valve position changing mechanism 13) is operated. Specifically, fluid (oil) discharged from the oil pump 20 acts on the valve 5, and the valve 5 moves in a direction away from the first port 11 against the urging force of the urging member 6. The fluid pressure is necessary for the communication between the inlet 7 and the outlet 8.

(During normal operation, when the valve position change mechanism is not operating)
As shown in FIGS. 3 and 6, when the OSV 15 is turned off, the fluid pressure of the first port 11 does not act on the sleeve 4 in the direction against the fluid pressure from the first port 11. Only the fluid pressure from the first port 11 acts on the sleeve 4, and the sleeve 4 is moved away from the first port 11 (on the second port 12 side). As shown in FIGS. 4 and 7, when the sleeve 4 moves to the second port 12 side (the side opposite to the first port 11), the first port 11 and the second port 12 communicate directly. To do. At this time, the valve 5 together with the sleeve 4 is located on the second port 12 side (opposite side of the first port 11) and the biasing member 6 is in a contracted state. It becomes difficult to be pushed back to the side.

  Therefore, when the fluid pressure in the supply flow path 10 is low, the valve 5 is not pushed back to the first port 11 side, and the locked portion 5b of the valve 5 is the sleeve 4 as shown in FIGS. The discharge port 8 of the sleeve 4 is maintained in a closed state by being locked to the locking portion 4e, and the sleeve 4 prohibits communication between the first port 11 and the second port 12.

  4 and 7, when the fluid pressure in the supply flow path 10 becomes high, the sleeve 4 receives the fluid pressure of the fluid flowing through the first port 11, and the sleeve is separated from the first port. Move in the direction you want. At this time, the urging member 6 in the contracted state is pushed back to the side opposite to the first port 11, and the first port 11 and the second port 12 are directly communicated with each other to be in an open state.

  Then, the fluid flows directly from the first port 11 to the second port 12. As a result, the fluid pressure received by the end face 4A of the sleeve 4 is reduced, so that the separation movement of the sleeve from the first port stops at a position where the biasing force of the biasing member 6 and the fluid pressure can be balanced. As a result, contact between the sleeve 4 and the valve body 2 is avoided, so that the generation of abnormal noise can be prevented.

  Further, since the valve 5 moves integrally with the sleeve 4 while being locked by the locking portion 4e of the sleeve 4, it is possible to prevent generation of contact sound between the valve 5 and the sleeve 4 caused by fluid pulsation. There is also an effect of reducing wear of the sleeve 4 and the valve 5.

  Thus, the first port 11 and the second port 12 communicate with each other, and excess fluid (oil) returns to the suction port of the oil pump 20. That is, in this case, the valve opening pressure of the relief valve 1 is set to a high pressure (second valve opening pressure). In other words, when the OSV 15 (the valve position changing mechanism 13) is not operated, the fluid is directly discharged from the first port 11 to the second port 12 by causing the fluid pressure of the fluid to act on the sleeve 4 at a pressure equal to or higher than the second valve opening pressure. The

  Here, the second valve opening pressure is a fluid pressure necessary for communicating the first port 11 and the second port 12 of the valve body 2 when the OSV 15 (valve position changing mechanism 13) is not operated. The fluid pressure is higher than the first valve opening pressure. Specifically, fluid (oil) discharged from the oil pump 20 acts on the sleeve 4, and the sleeve 4 moves away from the first port 11 against the urging force of the urging member 6 to move away from the first port 11. This is the fluid pressure required for direct communication between the first port 11 and the second port 12.

(At the time of failure due to clogging of the back pressure channel)
In the engine operating state, when the back pressure flow path 14 is clogged due to sludge or the like, even if the OSV 15 is in the ON state, the OSV 15 in the OFF state shown in FIGS. 3, 4, 6, and 7 Similarly, the fluid in the supply flow path 10 is not introduced into the sleeve 4 on the side opposite to the first port 11. In this case, the fluid pressure of the first port 11 does not act on the sleeve 4 in a direction that resists the fluid pressure from the first port 11. Therefore, in the relief valve 1, only the fluid pressure from the first port 11 acts on the sleeve 4, and the sleeve 4 is located on the second port 12 side (opposite side of the first port 11), and the valve opening The pressure becomes a high pressure setting (second valve opening pressure).

  As described above, the relief valve of the present invention is configured such that the valve opening pressure of the relief valve 1 is set to a high pressure when a failure such as the back pressure flow path 14 is clogged due to the influence of sludge or the like. For this reason, when the fluid pressure in the supply flow path 10 is low, the sleeve 4 and the valve 5 remain closed, and the oil continues to be supplied to the engine. Accordingly, it is possible to prevent problems such as engine seizure that occur when oil is not supplied to the engine.

Also, as shown in FIGS. 1 to 4, the sliding surface with the inner hole 2 a of the valve body 2 on the outer peripheral surface of the sleeve 4 at the end portions of the sleeve 4 (only in the vicinity of the end portions). 4a is formed, and a portion (outer peripheral surface 4b) sandwiched between both end portions (both sliding surfaces 4a) does not slide with the inner hole 2a of the valve body 2. Since the position of the sleeve 4 is changed using the fluid pressure of the first port 11, it is desirable that the sliding resistance with respect to the valve body 2 is as small as possible. Therefore, by distributing the sliding surface 4a with the valve body 2 to the vicinity of both end portions of the sleeve 4, the area of the sliding surface during sliding is reduced, and the inclination of the sleeve 4 is kept to a minimum. The frictional force generated between the two and the four is reduced as much as possible. By the sliding surface 4a, the sleeve 4 inside the valve body 2 is not inclined with respect to the axial direction inside the valve body 2, but maintains the posture along the axial direction inside the valve body 2. As it is, it moves between the first port 11 and the second port 12.
Other Embodiment

(1) The relief valve 1 according to the present invention includes a first communication hole 4d that discharges the fluid or air inside the sleeve 4 from the side opposite to the first port 11 through the valve 5. Is preferably provided on the sleeve 4. When the first communication hole 4d is provided in the sleeve 4, for example, as shown in FIG. 8, the first communication hole 4d is provided on the outer peripheral surface of the sleeve 4 opposite to the first port 11 side. When the position of the sleeve 4 is changed by the valve position changing mechanism 13, the volume of the fluid or air inside the sleeve 4 that is opposite to the first port 11 side with respect to the valve 5 is separated from the valve 5. Increase or decrease. At that time, the fluid or air on the side opposite to the first port 11 side is discharged by the first communication hole 4d, so that the fluid can freely enter and exit, and the resistance when the sleeve 4 moves is reduced. Can do.

(2) The relief valve 1 according to the present invention, as shown in FIG. 9, out of the fluid or air inside the sleeve 4, the fluid or air on the side opposite to the first port 11 side across the valve 5. The valve 5 is preferably provided with a second communication hole 5a for discharging. When the valve 5 is pushed down by the fluid pressure from the first port 11, the fluid or air on the side opposite to the first port 11 across the valve 5 becomes a resistance. When the second communication hole 5a is provided in the valve 5, as shown in FIG. 9 (a), the fluid or air passes through the second communication hole 5a while the valve 5 is being pushed down by the fluid pressure from the first port 11. It will be discharged to the second port 12 through the discharge port 8 of the sleeve 4. Accordingly, the discharge of the fluid in the space is promoted through the discharge port 8 of the sleeve 4, and the operation of the valve 5 becomes smooth. As shown in FIG. 9B, when the valve 5 is in an open state in which the valve 5 is separated from the inflow port 7 of the sleeve 4 and the discharge port 8 is opened, the second communication hole 5a and the discharge port 8 do not communicate with each other.

  The relief valve according to the present invention is not limited to adjusting the hydraulic pressure of the engine lubrication system, and can be widely used for various hydraulic pressure adjustments.

2 Valve body 4 Sleeve 5 Valve 6 Biasing member 7 Inlet 8 Outlet 11 First port 12 Second port 13 Valve position changing mechanism

Claims (8)

A valve body having a first port through which fluid flows and a second port through which fluid is discharged;
A sleeve that is accommodated in the valve body so as to be movable toward or away from the first port, and has an inflow port communicating with the first port and a discharge port communicating with the second port;
The sleeve is accommodated in the sleeve so as to be movable toward or away from the first port, and is moved away from the first port by prohibiting communication between the inlet and the outlet. A valve for communicating the inlet and the outlet by moving in a direction;
A biasing member that biases the sleeve and the valve toward the first port;
A valve position changing mechanism that changes a relative position between the valve body, the sleeve, and the valve;
A relief valve in which the first port and the second port directly communicate with each other when the sleeve receives a fluid pressure of the fluid flowing through the first port and moves in a direction away from the first port.   2. The relief valve according to claim 1, wherein the valve position changing mechanism causes the fluid pressure of the fluid flowing through the first port to act on the sleeve to move in the same direction as the urging direction of the urging member. During operation of the valve position changing mechanism, the fluid is discharged from the discharge port by causing the fluid pressure of the fluid to act on the valve at a first valve opening pressure or higher,
When the valve position changing mechanism is not in operation, the sleeve is moved in a direction away from the first port by applying a fluid pressure of the fluid to the sleeve more than a second valve opening pressure. The second port communicates, and the fluid is discharged from the first port to the second port;
The relief valve according to claim 1 or 2 , wherein the second valve opening pressure is a fluid pressure higher than the first valve opening pressure. The relief valve according to claim 3 , wherein the valve and the sleeve move integrally when the valve position changing mechanism is not operated. Of the both end faces of the sleeve, one end face faces the first port, and the other end face faces the flow path of the valve position changing mechanism,
The relief valve according to any one of claims 1 to 4 , wherein an area of the other end face is set larger than an area of the one end face. Of the outer peripheral surface of said sleeve, said forming a sliding surface of the valve body at the site of both ends of the sleeve, the claims to a site sandwiched between the both ends do not form the sliding surface section 1-5 A relief valve according to any one of the above. Of fluid or air in the interior of the sleeve, a first communication hole for discharging the fluid or air on the opposite side to the side of said separating the valve first port, claim 1 is provided on the sleeve 6 A relief valve according to any one of the above. Of the internal fluid or air in the sleeve, said second communication hole for discharging the fluid or air in the opposite side of the separating valve side of the first port, according to claim 1 is provided to the valve 7 A relief valve according to any one of the above.

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