JP2021032393A - Pressure control valve - Google Patents

Abstract

To satisfactorily suppress wear of a valve element and a valve body of a pressure control valve and generation of abnormal noise associated with closing of the valve.SOLUTION: A pressure control valve of the present disclosure includes: a valve element that is movably disposed inside a valve body including an inflow port and an outflow port for a fluid, and that moves to bring the inflow port and the outflow port into communication with each other according to the pressure of the fluid acting through the inflow port; an urging member that urges the valve element so that one end of the valve element closes the inflow port; a sleeve that has the same hardness as that of the valve element, and that is disposed between the valve body and the valve element and slidably supports the other end side of the valve element; a space portion that is defined on the inflow port side of the sleeve by the outer circumferential surface of the valve element and the inner circumferential surface of the valve body, and that communicates with the inflow port; and an inflow regulation portion that is formed on the one end of the valve element to regulate inflow of the fluid from the inflow port to the space portion.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a pressure control valve including a valve body movably arranged in the valve body and an urging member for urging the valve body.

Conventionally, as this type of pressure control valve, the valve is closed when the oil pressure of the hydraulic oil flowing through the oil passage is equal to or lower than the valve opening pressure, and the valve is opened when the oil pressure of the hydraulic oil exceeds the valve opening pressure. A relief valve that releases the oil pressure in the oil passage is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2019-70421

Generally, the valve body of the pressure control valve as described above is slidably supported by the valve body, and the outer peripheral surface of the valve body is subjected to surface treatment for improving slidability, wear resistance, and the like. To. However, the surface treatment increases the hardness of the valve body (outer peripheral surface), which may cause wear of the valve body. Further, in the pressure control valve, it is necessary to suppress the generation of abnormal noise caused by the valve body colliding with the periphery of the inflow port when the valve is closed.

Therefore, a main object of the present disclosure is to provide a pressure control valve capable of satisfactorily suppressing wear of the valve body and the valve body and generation of abnormal noise due to valve closing.

The pressure control valve of the present disclosure is movably arranged in a valve body including an inflow port and an outflow port of a fluid, and the inflow port and the outflow port depending on the pressure of the fluid acting through the inflow port. A pressure control valve including a valve body that moves so as to communicate with the valve body and an urging member that urges the valve body so that one end of the valve body closes the inflow port is equivalent to the valve body. A sleeve that has hardness and is arranged between the valve body and the valve body to slidably support the other end side of the valve body, and an outer peripheral surface of the valve body and an inner peripheral surface of the valve body. To the space portion that is defined on the inflow port side of the sleeve and communicates with the outflow port, and to the one end of the valve body so as to restrict the inflow of the fluid from the inflow port to the space portion. It includes the formed inflow control section.

In the pressure control valve of the present disclosure, a sleeve having the same hardness as the valve body is arranged between the valve body and the valve body, and the other end side of the valve body is slidably supported by the sleeve. This makes it possible to satisfactorily suppress wear of the valve body and the valve body regardless of the hardness of the valve body. Further, since the other end side of the valve body is supported by the sleeve, a space portion communicating with the outflow port is defined on the inflow port side of the sleeve by the outer peripheral surface of the valve body and the inner peripheral surface of the valve body. .. Here, when the valve body moves to the valve opening side in response to the increase in the fluid pressure acting through the inflow port and the fluid flows from the inflow port into the space when the inflow port is opened, the fluid in the inflow port Due to the decrease in pressure, the valve body may be strongly pressed around the inflow port by the urging force of the urging member, and abnormal noise may be generated. Further, depending on the pressure of the fluid, the valve body may vibrate and abnormal noise may be continuously generated. Based on this, an inflow control portion that regulates the inflow of fluid from the inflow port to the space portion is formed at one end of the valve body. As a result, it is possible to suppress a drop in pressure of the fluid at the inflow port when the valve body moves to the valve opening side, and to suppress a sudden movement of the valve body to the valve closing side due to the urging force of the urging member. As a result, in the pressure control valve of the present disclosure, it is possible to satisfactorily suppress wear of the valve body and the valve body and generation of abnormal noise due to valve closing.

It is sectional drawing which shows the pressure control valve of this disclosure. It is sectional drawing along the line II-II in FIG.

Next, a mode for carrying out the invention of the present disclosure will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing the pressure control valve 1 of the present disclosure, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. The pressure control valve 1 shown in these drawings is a relief valve applied to a hydraulic control device that regulates hydraulic oil (fluid) from an oil pump of a vehicle and supplies it to a friction engaging element of a transmission or a lubrication target. .. The pressure control valve 1 of the present embodiment, for example, regulates the hydraulic oil drained from the primary regulator valve as the hydraulic oil from the oil pump is regulated, and regulates the drain oil of the secondary regulator valve to provide substantially constant lubrication. Generate pressure. As shown in FIGS. 1 and 2, the pressure control valve 1 is slidable (movable) by the valve body VB of the hydraulic control device, the sleeve 2 held by the valve body VB, and the sleeve 2 in the valve body VB. ), And a spring 4 as an urging member for urging the valve body 3.

The valve body VB includes, for example, a lower body LB and an upper body (not shown) formed of an aluminum alloy, and a separate plate SP arranged between the lower body LB and the upper body. The lower body LB is formed with a hole H in which the sleeve 2 and the valve body 3 are arranged, and two outflow ports Po communicating with the hole H. As shown in FIGS. 1 and 2, the two outflow ports Po are formed at intervals of 180 ° when viewed from the separate plate SP side so as to face each other in the vicinity of the separate plate SP. Each outflow port Po communicates with, for example, an oil pan (hydraulic oil storage portion) of a vehicle or a suction port of an oil pump through an oil passage (not shown) formed in the lower body LB. Further, the separate plate SP includes an inflow port Pi which is an opening (circular hole) having a diameter smaller than the inner diameter of the hole H on the upper body side. The inflow port Pi communicates with, for example, the drain port of the secondary regulator valve via the oil passage L defined by the upper body and the separate plate SP.

The sleeve 2 is a bottomed tubular member having a shaft length shorter than the shaft length of the hole H, and is made of a material having a relatively high altitude such as an iron alloy. The sleeve 2 is fixed in the hole H by, for example, press fitting so that the bottom surface thereof abuts on the bottom surface of the hole H and the end surface 2a on the open end side is separated from the separate plate SP by each outflow port Po. ..

The valve body 3 is also a bottomed tubular member having a shaft length shorter than the shaft length of the hole H, and is formed of a material having a relatively high altitude such as an iron alloy. The valve body 3 may be formed of the same material as the sleeve 2, and may be formed of a material different from the sleeve 2 as long as it has the same hardness as the material forming the sleeve 2. As shown in FIG. 1, the valve body 3 includes a cylindrical tubular portion 31 and a disc-shaped closed end portion 32 formed at one end of the tubular portion 31 in the axial direction. The tubular portion 31 has an outer diameter slightly larger than the inner diameter of the inflow port Pi and slightly smaller than the inner diameter of the sleeve 2, and is on the opposite side (the other end side) of the tubular portion 31 from the closed end portion 32. , About half of the area (lower side in the middle of FIG. 1) is slidably supported by the sleeve 2. As a result, on the inflow port Pi side (upper side in FIG. 1) of the sleeve 2, the outer peripheral surface of the tubular portion 31 of the valve body 3 and the inner peripheral surface of the lower body LB (hole H) are attached to each outflow port Po. A tubular space portion Z that communicates with each other is defined.

The closed end portion 32 has an end face having a surface area larger than the opening area of the inflow port Pi. Further, the closed end portion 32 includes an annular (flange-shaped) diameter-expanded portion 33 whose diameter is expanded so as to project radially outward from the outer peripheral surface of the tubular portion 31 over the entire circumference. The enlarged diameter portion 33 is formed so as not to come into contact with the inner peripheral surface of the lower body LB (hole portion H), and as shown in FIG. 1, is formed with the end surface 2a of the sleeve 2 when viewed from the inflow port Pi side (upper side in FIG. 1). Overlap. Further, the clearance G1 (see FIG. 1) between the inner peripheral surface of the lower body LB (hole H) and the outer peripheral surface of the enlarged diameter portion 33 is such that the valve body 3 has a sleeve 2 (lower body) in a closed state or a state close to the valve closed state. Between the inner peripheral surface of the sleeve 2 and the tubular portion 31 of the valve body 3 so that the enlarged diameter portion 33 does not come into contact with the inner peripheral surface of the lower body LB (hole H) when tilted with respect to the LB). It is defined to be larger than the clearance G2 (see FIG. 2).

The spring 4 is a coil spring and is arranged in the tubular portion 31 of the valve body 3 so as to abut the inner surface of the closed end portion 32 and the bottom surface of the sleeve 2. While the spring 4 is maintained at its natural length, the end face of the closed end 32 of the valve body 3 abuts on the separate plate SP, thereby closing the inflow port Pi.

In the pressure control valve 1 configured as described above, the valve body 3 communicates the inflow port Pi with each outflow port Po according to the pressure of the hydraulic oil acting from the oil passage L through the inflow port Pi. The valve is opened by moving against the urging force of the spring 4. As a result, a part of the hydraulic oil flowing through the oil passage L flows out from the inflow port Pi to each outflow port Po, whereby the oil pressure in the oil passage L is adjusted to a substantially constant lubrication pressure. In the pressure control valve 1, a sleeve 2 having the same hardness as the valve body 3 is arranged between the lower body LB and the valve body 3 (cylindrical portion 31), and the closed end portion 32 of the tubular portion 31 is used. The opposite portion is slidably supported by the sleeve 2. As a result, it is possible to satisfactorily suppress the wear of the valve body 3 and the lower body LB regardless of the hardness of the lower body LB.

Further, since the tubular portion 31 of the valve body 3 is supported by the sleeve 2, the outer peripheral surface of the tubular portion 31 and the lower body LB (hole H) are on the inflow port Pi side (upper side in FIG. 1) of the sleeve 2. ) Is defined as a space portion Z communicating with each outflow port Po. Here, when the valve body 3 moves to the valve opening side and opens the inflow port Pi in response to the increase in the flood pressure acting through the inflow port Pi, the hydraulic oil flows from the inflow port Pi into the space portion Z. Due to a decrease in the oil pressure at the inflow port Pi, the closed end portion 32 of the valve body 3 may be strongly pressed around the inflow port Pi, that is, against the separate plate SP by the urging force of the spring 4, and an abnormal noise may be generated. Further, depending on the oil pressure in the oil passage L, the valve body 3 may vibrate and abnormal noise may be continuously generated. Based on this, a diameter-expanded portion 33 is formed at the closed end portion 32 (one end) of the valve body 3 as an inflow regulating portion that regulates the inflow of hydraulic oil from the inflow port Pi to the space portion Z. As a result, when the valve body 3 moves to the valve opening side, the decrease in the oil pressure at the inflow port Pi is suppressed, and the valve body 3 suddenly moves to the valve closing side (separate plate SP side) due to the urging force of the spring 4. Can be suppressed. As a result, in the pressure control valve 1, it is possible to satisfactorily suppress the wear of the valve body 3 and the lower body LB and the generation of abnormal noise due to the valve closing.

Further, in the pressure control valve 1, the diameter-expanded portion 33 as the inflow restricting portion expands the diameter over the entire circumference so that the closed end portion 32 of the valve body 3 overlaps the end surface 2a of the sleeve 2 when viewed from the inflow port Pi side. It is formed by doing. As a result, it is possible to extremely satisfactorily suppress a decrease in the oil pressure at the inflow port Pi when the valve body 3 moves to the valve opening side. However, depending on the volume of the space portion Z and the like, the diameter-expanded portion 33 may be formed by expanding the diameter of a part of the closed end portion 32 so as to overlap the end surface 2a of the sleeve 2 when viewed from the inflow port Pi side. ..

Further, in the pressure control valve 1, the clearance G1 between the lower body LB and the enlarged diameter portion 33 of the valve body 3 is defined to be larger than the clearance G2 between the sleeve 2 and the tubular portion 31 of the valve body 3. As a result, even if the valve body 3 is tilted with respect to the lower body LB (sleeve 2) due to the pressure adjustment of the hydraulic oil, it is possible to prevent the enlarged diameter portion 33 of the valve body 3 from coming into contact with the lower body LB. Therefore, it is possible to suppress the wear of the valve body 3 and the lower body LB extremely well.

Further, the lower body LB includes two outflow ports Po arranged so as to face each other via the valve body 3. As a result, it is possible to satisfactorily suppress the valve body 3 from tilting with respect to the lower body LB (sleeve 2) as the pressure of the hydraulic oil is adjusted.

Further, by making the hardness of the sleeve 2 and the hardness of the valve body 3 higher than the hardness of the lower body LB, the lower body LB (valve body VB) can be formed of a lightweight material such as an aluminum alloy having a relatively low hardness. It becomes.

As described above, the pressure control valve of the present disclosure is movably arranged in a valve body (VB, LB, SP) including an inflow port (Pi) and an outflow port (Po) of a fluid, and the inflow port. A valve body (3) that moves so as to communicate between the inflow port (Pi) and the outflow port (Po) according to the pressure of the fluid acting via (Pi), and the valve body (3). In a pressure control valve (1) including an urging member (4) that urges the valve body (3) so that one end (32) closes the inflow port (Pi), the valve body (3) and the valve body (3). A sleeve (2) having the same hardness and slidably supporting the other end side of the valve body (3), which is arranged between the valve body (LB) and the valve body (3), The outer peripheral surface of the valve body (3, 31) and the inner peripheral surface of the valve body (LB) are defined on the inflow port (Po) side of the sleeve (2) and on the outflow port (Po). An inflow formed at one end (32) of the valve body (3) so as to restrict the inflow of the fluid from the communicating space portion (Z) and the inflow port (Pi) to the space portion (Z). It includes the regulatory department (33).

In the pressure control valve of the present disclosure, a sleeve having the same hardness as the valve body is arranged between the valve body and the valve body, and the other end side of the valve body is slidably supported by the sleeve. This makes it possible to satisfactorily suppress wear of the valve body and the valve body regardless of the hardness of the valve body. Further, since the other end side of the valve body is supported by the sleeve, a space portion communicating with the outflow port is defined on the inflow port side of the sleeve by the outer peripheral surface of the valve body and the inner peripheral surface of the valve body. .. Here, when the valve body moves to the valve opening side in response to the increase in the pressure of the fluid pressure acting through the inflow port and the fluid flows from the inflow port into the space when the inflow port is opened, the inflow port Due to the decrease in fluid pressure, the valve body may be strongly pressed around the inflow port by the urging force of the urging member, and abnormal noise may be generated. Further, depending on the pressure of the fluid, the valve body may vibrate and abnormal noise may be continuously generated. Based on this, an inflow control portion that regulates the inflow of fluid from the inflow port to the space portion is formed at one end of the valve body. As a result, it is possible to suppress a drop in pressure of the fluid at the inflow port when the valve body moves to the valve opening side, and to suppress a sudden movement of the valve body to the valve closing side due to the urging force of the urging member. As a result, in the pressure control valve of the present disclosure, it is possible to satisfactorily suppress wear of the valve body and the valve body and generation of abnormal noise due to valve closing.

Further, the inflow control unit expands the entire circumference of the valve body (3) so as to overlap the end surface (2a) of the sleeve (2) when viewed from the inflow port (Pi) side. It may be a diameter-expanded portion (33). This makes it possible to extremely well suppress the pressure drop of the fluid at the inflow port when the valve body moves to the valve opening side. However, the inflow control portion may be a diameter-expanded portion in which a part of one end of the valve body is enlarged so as to overlap the end face of the sleeve when viewed from the inflow port side.

Further, the clearance (G1) between the valve body (LB) and the inflow control portion (33) is larger than the clearance (G2) between the sleeve (2) and the valve body (3, 31). It may be large. As a result, even if the valve body tilts with respect to the valve body (sleeve) due to the pressure adjustment of the fluid, it is possible to prevent the inflow control portion of the valve body from coming into contact with the valve body. It is possible to suppress the wear of the valve body extremely well.

Further, the valve body (LB) may include two outflow ports (Po) arranged so as to face each other via the valve body (3). This makes it possible to satisfactorily suppress the valve body from tilting with respect to the valve body (sleeve) as the fluid pressure is adjusted.

Further, the hardness of the sleeve (2) and the hardness of the valve body (3) may be higher than the hardness of the valve body (LB). This makes it possible to form the valve body from a lightweight material.

It goes without saying that the invention of the present disclosure is not limited to the above-described embodiment, and various changes can be made within the scope of the extension of the present disclosure. Furthermore, the above-described embodiment is merely a specific embodiment of the invention described in the column of the outline of the invention, and does not limit the elements of the invention described in the column of the outline of the invention.

The invention of the present disclosure can be used in the manufacturing field of a pressure control valve and the like.

1 Pressure control valve, 2 sleeve, 2a end face, 3 valve body, 31 tubular part, 32 closed end part, 33 diameter expansion part (inflow control part), 4 spring, G1, G2 clearance, H hole part, L oil passage , LB lower body, Pi inflow port, Po outflow port, SP separate plate, VB valve body, Z space.

Claims (5)

It is movably arranged in the valve body including the inflow port and the outflow port of the fluid, and moves so as to communicate with the inflow port and the outflow port according to the pressure of the fluid acting through the inflow port. In a pressure control valve including a valve body and an urging member that urges the valve body so that one end of the valve body closes the inflow port.
A sleeve having the same hardness as the valve body and slidably supporting the other end side of the valve body, which is arranged between the valve body and the valve body.
A space portion defined on the inflow port side of the sleeve by the outer peripheral surface of the valve body and the inner peripheral surface of the valve body and communicating with the outflow port.
An inflow restricting portion formed at one end of the valve body so as to restrict the inflow of the fluid from the inflow port to the space portion.
A pressure control valve equipped with. In the pressure control valve according to claim 1,
The inflow control portion is a pressure control valve which is a diameter-expanded portion whose diameter is expanded over the entire circumference so that one end of the valve body is overlapped with the end surface of the sleeve when viewed from the inflow port side. In the pressure control valve according to claim 1 or 2.
A pressure control valve in which the clearance between the valve body and the inflow control portion is larger than the clearance between the sleeve and the valve body. The pressure control valve according to any one of claims 1 to 3.
The valve body is a pressure control valve including two outflow ports arranged so as to face each other via the valve body. The pressure control valve according to any one of claims 1 to 4.
A pressure control valve in which the hardness of the sleeve and the hardness of the valve body are higher than the hardness of the valve body.

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