CN112005034B

CN112005034B - Valve device

Info

Publication number: CN112005034B
Application number: CN202080002274.8A
Authority: CN
Inventors: 铃木健司; 松阪庆太; 铃木淳
Original assignee: KYB Corp
Current assignee: KYB Corp
Priority date: 2019-03-26
Filing date: 2020-01-23
Publication date: 2022-05-10
Anticipated expiration: 2040-01-23
Also published as: JP2020159464A; WO2020195072A1; JP6741815B1; CN112005034A

Abstract

The valve device (10) comprises: a housing (20); a valve element (110) housed in the housing (20); an urging member (9) that urges the valve element (110); an annular sheet member (130) which is disposed between the valve element (110) and the biasing member (9) and transmits the biasing force of the biasing member (9) to the valve element (110); a housing chamber (122) formed in the housing (20) and housing the biasing member (9) and the sheet member (130); a through hole (123) that penetrates from the end surface of the housing (20) to the housing chamber (122); and a sealing member (140) which is attached to the through-hole (123) and seals the through-hole (123), wherein the sheet member (130) has a non-circular shape having a 1 st outer dimension larger than the inner diameter (Dh) of the through-hole (123) and a 2 nd outer dimension smaller than the inner diameter (Dh) of the through-hole (123).

Description

Valve device

Technical Field

The present invention relates to a valve device.

Background

In JP 2018-119664 a, there is described a valve device including: a spool inserted as a valve element into a valve receiving hole formed in the housing; and springs provided at both ends of the spool to hold the spool at a neutral position.

In this valve device, a spring and a spring piece disposed between the spring and a spool are housed in a pilot chamber formed by a valve housing hole, a plug as a blocking member screwed to an opening end of the valve housing hole, and an end surface of the spool.

Disclosure of Invention

In the valve device described in JP 2018-119664 a, in order to insert the spring and the spring piece from the open end of the valve accommodating hole and dispose them in the pilot chamber, it is necessary to increase the diameter of the open end of the valve accommodating hole. As a result, there is a problem that the plugging member screwed to the opening end of the valve accommodating hole becomes large.

The purpose of the present invention is to reduce the size of a plugging member.

According to one aspect of the present invention, a valve device includes: a housing; a valve element housed in the case; a biasing member that biases the valve element; an annular sheet member disposed between the valve element and the biasing member, the sheet member transmitting the biasing force of the biasing member to the valve element; a housing chamber formed in the housing and housing the biasing member and the sheet member; a through hole penetrating from an end surface of the housing to the housing chamber; and a blocking member attached to the through hole to block the through hole, wherein the sheet member has a non-circular shape having a 1 st outer dimension larger than an inner diameter of the through hole and a 2 nd outer dimension smaller than the inner diameter of the through hole.

Drawings

Fig. 1 is a diagram showing a configuration of a fluid pressure control device including a valve device according to an embodiment of the present invention.

Fig. 2 is a partially enlarged sectional view showing a part II of fig. 1 in an enlarged manner.

Fig. 3 is a view of the spring piece as viewed in the axial direction of the spool, and shows the size relationship between the spring piece and the through hole.

Fig. 4 is a diagram for explaining a method of disposing the spring piece in the housing chamber.

Fig. 5 is a view showing a spring plate of a valve device according to modification 1 of the present embodiment.

Fig. 6 is a view showing a spring plate of a valve device according to modification 2 of the present embodiment.

Detailed Description

A valve device 10 according to an embodiment of the present invention will be described with reference to the drawings. Hereinafter, an example in which the valve device 10 is a back pressure valve device will be described. The back pressure valve device is provided to suppress a shock generated at the time of starting and stopping in a drive circuit of a hydraulic motor constituting a traveling device of a construction machine such as a hydraulic excavator or a wheel loader.

A fluid pressure control device 100 including a valve device 10 will be described with reference to fig. 1. In the fluid pressure control device 100, the working oil is used as the working fluid, but another fluid such as the working water may be used as the working fluid.

As shown in fig. 1, a fluid pressure control device 100 of the present embodiment is provided between a hydraulic pump 1 that discharges hydraulic fluid and a hydraulic motor 2 that is a fluid pressure actuator, and controls driving of the hydraulic motor 2. The fluid pressure control device 100 includes: a direction switching valve 3 that controls the flow of the hydraulic oil from the hydraulic pump 1 to the hydraulic motor 2 and switches the operation direction (rotation direction) of the hydraulic motor 2; and a valve device 10 provided in a pair of supply and

drain passages

22a, 22b connecting the direction switching valve 3 and the hydraulic motor 2.

The hydraulic motor 2 is used as a hydraulic motor for traveling. The hydraulic motor 2 is rotationally driven by being supplied with hydraulic oil discharged from the hydraulic pump 1. The hydraulic motor 2 is switched to rotate in the forward direction or the reverse direction by the direction switching valve 3. The construction machine is advanced by the forward rotation of the hydraulic motor 2, and is retracted by the reverse rotation of the hydraulic motor 2.

The construction machine further includes a passive parking brake 2a connected to the brake release passage 23. The parking brake 2a is of such a structure: when the pressure in the brake release passage 23 is lower than the brake release pressure, the brake is operated by the urging force of the spring, and when the pressure in the brake release passage 23 becomes equal to or higher than the brake release pressure, the brake is released by moving the piston against the urging force of the spring.

The directional control valve 3 has a forward position (a) for guiding the hydraulic fluid discharged from the hydraulic pump 1 to the hydraulic motor 2 via the supply/discharge passage 22a, a reverse position (B) for guiding the hydraulic fluid discharged from the hydraulic pump 1 to the hydraulic motor 2 via the supply/discharge passage 22B, and a neutral position (C) for communicating the hydraulic pump 1 and the hydraulic motor 2 with the tank T. The direction switching valve 3 is switched by pilot pressure introduced into the

pilot chambers

3a and 3b in accordance with an operation of the operation lever.

The valve device 10 includes a rectangular parallelepiped housing 20. The housing 20 is formed with valve-

side passages

14a, 14b that communicate with the direction switching valve 3 via supply and

drain passages

22a, 22b, and actuator-

side passages

15a, 15b that communicate with the hydraulic motor 2 via the supply and

drain passages

22a, 22 b.

The valve device 10 includes: a control valve 11 that controls the flow of the hydraulic oil between the valve-

side passages

14a, 14b and the actuator-

side passages

15a, 15b when the direction switching valve 3 is switched; and

check valves

17a, 17b that permit only flow from the valve-

side passages

14a, 14b toward the actuator-

side passages

15a, 15 b.

The control valve 11 includes: a spool 110 as a valve body accommodated in a valve accommodation hole 120 formed to penetrate the housing 20; a 1 st plug 140a and a 2 nd plug 140b as blocking members for blocking open ends (through holes 123 described later) on both sides in the axial direction of the valve accommodating hole 120; a 1 st coil spring 9a and a 2 nd coil spring 9b provided at both ends of the spool 110, respectively, for holding the spool 110 at a neutral position; and a 1 st spring piece 130a and a 2 nd spring piece 130b disposed between the spool 110 and the 1 st coil spring 9a and between the spool 110 and the 2 nd coil spring 9 b. The 1 st and 2 nd spring pieces 130a and 130b are annular piece members that transmit the biasing force of the 1 st and 2

nd coil springs

9a and 9b to the spool 110.

The 1 st pressure chamber 16a is provided on one axial side of the spool 110, and the 2 nd pressure chamber 16b is provided on the other axial side of the spool 110. The 1 st and 2

nd pressure chambers

16a and 16b are formed by the valve accommodating hole 120 of the housing 20, the 1 st and 2

nd plugs

140a and 140b attached to an opening end (a through hole 123 described later) of the valve accommodating hole 120, and an end of the spool 110, respectively.

The valve accommodating hole 120 includes a spool hole 121 through which the spool 110 slides, a 1 st accommodating chamber 122a and a 2 nd accommodating chamber 122b in which the 1 st coil spring 9a and the 2 nd coil spring 9b and the 1 st spring piece 130a and the 2 nd spring piece 130b are accommodated, and a 1 st through hole 123a and a 2 nd through hole 123b that penetrate from an end surface of the housing 20 to the 1 st accommodating chamber 122a and the 2 nd accommodating chamber 122 b. The 1 st through hole 123a and the 2 nd through hole 123b have an inner diameter slightly larger than the outer diameter of the spool 110 so that the spool 110 can be inserted from the outside of the housing 20.

The valve device 10 is formed in a left-right symmetrical shape. Therefore, hereinafter, the 1 st coil spring 9a and the 2 nd coil spring 9b are collectively referred to as the coil springs 9, and the 1 st spring piece 130a and the 2 nd spring piece 130b are collectively referred to as the spring pieces 130. The 1 st housing chamber 122a and the 2 nd housing chamber 122b are collectively referred to as a housing chamber 122, the 1 st through hole 123a and the 2 nd through hole 123b are collectively referred to as a through hole 123, and the 1 st plug 140a and the 2 nd plug 140b are collectively referred to as a plug 140. The cross-sectional shape of the spool hole 121, the cross-sectional shape of the housing chamber 122, and the cross-sectional shape of the through hole 123 are circular shapes concentric with the center axis of the spool 110.

As shown in fig. 2, a female screw is formed on the inner periphery of the through hole 123. The plug 140 has a flange 141 abutting an end surface of the housing 20 and a stem portion 142 protruding from the flange 141. The stem 142 has a diameter smaller than that of the flange 141, and a male screw screwed into the female screw of the through-hole 123 is formed on the outer periphery of the stem 142. The plug 140 is attached to the through-hole 123 by screwing the rod portion 142 into the through-hole 123. A sealing member is disposed between the flange 141 and the opening end of the through-hole 123, and a gap between the through-hole 123 and the plug 140 is sealed by the sealing member.

The coil spring 9 is an urging member that urges the spool 110 in the axial direction, and expands and contracts with the movement of the spool 110 in the axial direction, thereby increasing/decreasing the urging force applied to the spool 110. As shown in fig. 1, the 1 st coil spring 9a is disposed in a compressed state in the 1 st pressure chamber 16a, and the 2 nd coil spring 9b is disposed in a compressed state in the 2 nd pressure chamber 16 b. The 1 st coil spring 9a biases the spool 110 against the biasing force of the spool 110 by the hydraulic oil of the 2 nd pressure chamber 16 b. The 2 nd coil spring 9b biases the spool 110 against the biasing force of the 1 st pressure chamber 16a on the spool 110.

The spool 110 has a main body portion 111 that slides in a spool hole 121 of the housing 20, and protruding portions 112(112a, 112b) that protrude in the axial direction from both ends of the main body portion 111. The cross-sectional shape of the body portion 111 and the cross-sectional shape of the protrusion portion 112 are circular shapes concentric with the central axis of the spool 110, respectively. The body 111 has a plurality of shoulder portions, and an annular groove is provided between the shoulder portions. Therefore, in accordance with the displacement in the axial direction of the body 111, the adjacent flow paths communicate with each other through the annular groove or are blocked by the land portion.

The projection 112a abuts on the 1 st plug 140a to limit the maximum movement amount (maximum stroke) of the spool 110 to one axial side (left direction in the drawing). The projecting portion 112b abuts on the 2 nd plug 140b to limit the maximum movement amount (maximum stroke) of the spool 110 to the other side (right in the drawing) in the axial direction.

As shown in fig. 2, the inner diameter of the housing chamber 122 is larger than the inner diameter of the spool hole 121. Therefore, a stepped portion 124 is formed between the inner peripheral surface of the housing chamber 122 and the inner peripheral surface of the spool hole 121. The outer diameter of the protrusion 112 is smaller than the outer diameter of the body 111. Therefore, a step portion 119 is formed between the outer peripheral surface of the protruding portion 112 and the outer peripheral surface of the main body portion 111. The step portion 124 of the housing 20 and the step portion 119 of the spool 110 function as an abutting portion against which the spring plate 130 abuts.

The coil spring 9 is disposed so that the protrusion 112 is inserted inside. An annular spring piece 130 is disposed between the step portion 119 of the spool 110 and the coil spring 9. The spring piece 130 has a circular opening into which the protrusion 112 is inserted. The coil spring 9 is disposed with one end thereof abutting against the spring plate 130 and the other end thereof abutting against the plug 140, and urges the spool 110 in the axial direction via the spring plate 130.

As shown in fig. 1, a communication passage 13a and a communication passage 13b are provided inside the spool 110; the above-described communication passage 13a always communicates the valve side passage 14a and the 1 st pressure chamber 16a regardless of the position of the spool 110; the above-described communication passage 13b always communicates the valve side passage 14b and the 2 nd pressure chamber 16b regardless of the position of the spool 110. The

communication passages

13a and 13b are provided with throttles 12a and 12b, and the throttles 12a and 12b restrict the flow by applying resistance to the flow of the hydraulic oil passing therethrough.

The spool 110 moves in the axial direction in accordance with the pressure of the 1 st pressure chamber 16a and the pressure of the 2 nd pressure chamber 16 b. When the pressure difference between the 1 st pressure chamber 16a and the 2 nd pressure chamber 16b is smaller than the predetermined value, the spool 110 is held at the neutral position shown in fig. 1 by the 1 st coil spring 9a and the 2 nd coil spring 9b as centering springs. At this time, the 1 st spring piece 130a abuts on the step portion 124(124a) of the housing 20, and the 2 nd spring piece 130b abuts on the step portion 124(124b) of the housing 20, so that the positioning accuracy of the neutral position of the spool 110 is improved.

When the pressure of the 1 st pressure chamber 16a rises higher than the pressure of the 2 nd pressure chamber 16b and the pressure difference therebetween becomes a predetermined value or more, the spool 110 moves rightward in the drawing. At this time, since the 1 st spring piece 130a abuts on the step portion 124(124a) of the housing 20 and the 1 st spring piece 130a is restricted from moving, the 1 st spring piece 130a is separated from the step portion 119(119a) of the spool 110. The 2 nd spring piece 130b is pressed by the step portion 119(119b) of the spool 110 and moves rightward in the drawing, and separates from the step portion 124(124b) of the housing 20. Therefore, the 2 nd coil spring 9b contracts with the movement of the 2 nd spring piece 130 b.

When the pressure of the 2 nd pressure chamber 16b rises higher than the pressure of the 1 st pressure chamber 16a and the pressure difference therebetween reaches a predetermined value or more, the spool 110 moves leftward as viewed in the drawing. At this time, since the 2 nd spring piece 130b abuts on the step portion 124(124b) of the housing 20 and the movement of the 2 nd spring piece 130b is restricted, the 2 nd spring piece 130b is separated from the step portion 119(119b) of the spool 110. The 1 st spring piece 130a is pressed by the step portion 119(119a) of the spool 110, moves leftward in the drawing, and separates from the step portion 124(124a) of the housing 20. Therefore, the 1 st coil spring 9a contracts with the movement of the 1 st spring piece 130 a.

When the directional control valve 3 is in the neutral position (C), the 1 st and 2

nd pressure chambers

16a and 16b communicate with the working fluid tank T. Therefore, the control valve 11 is held at the neutral position as shown in the figure by the biasing forces of the 1 st coil spring 9a and the 2 nd coil spring 9b provided on both sides.

When the directional control valve 3 is switched to the forward position (a), the hydraulic oil discharged from the hydraulic pump 1 is guided to the 1 st pressure chamber 16a through the supply/discharge passage 22a, the valve-side passage 14a, and the communication passage 13a in the control valve 11, and the spool 110 moves in the rightward direction in the drawing. When the directional control valve 3 is switched to the reverse position (B), the hydraulic oil discharged from the hydraulic pump 1 is guided to the 2 nd pressure chamber 16B via the supply/discharge passage 22B, the valve-side passage 14B, and the communication passage 13B in the control valve 11, and the spool 110 moves in the left direction as shown in the drawing.

Next, as an example of the operation of the valve device 10 and the operation of the fluid pressure control device 100, the operation of the valve device 10 and the operation of the fluid pressure control device 100 in the case of advancing the construction machine will be described.

When the operator operates the operation lever toward the forward side, the pilot pressure corresponding to the operation amount is introduced into the pilot chamber 3 a. Thereby, the directional control valve 3 is switched to the forward position (a), and the hydraulic oil discharged from the hydraulic pump 1 flows into the valve-side passage 14a of the valve device 10 via the supply/discharge passage 22 a.

A part of the hydraulic oil that has flowed into the valve-side passage 14a of the valve device 10 flows into the 1 st pressure chamber 16a via the communication passage 13 a. Thereby, the spool 110 of the control valve 11 moves in the right direction in the drawing. At this time, since the flow of the working oil flowing through the communication passage 13a is restricted by the orifice 12a, the working oil slowly flows into the 1 st pressure chamber 16 a. Thereby, the spool 110 of the control valve 11 is slowly moved in the right direction in the drawing.

When the spool 110 moves from the neutral position to the right in the drawing, the hydraulic oil discharged from the hydraulic pump 1 is supplied to the hydraulic motor 2 through the supply/discharge passage 22 a. The hydraulic oil discharged from the hydraulic motor 2 is returned to the hydraulic fluid tank T via the supply/discharge passage 22 b. The hydraulic oil discharged from the hydraulic pump 1 is also guided from the control valve 11 to the parking brake 2a via the brake release passage 23, and the parking brake 2a is released. Thereby, the hydraulic motor 2 rotates in the forward direction, and the construction machine advances. In addition, since the spool 110 of the control valve 11 moves slowly, a shock generated at the time of start is suppressed.

When the operator returns the operation lever to the neutral position, the pilot chamber 3a communicates with the tank T, and the direction switching valve 3 is returned to the neutral position (C) by the biasing force of the spring.

When the directional control valve 3 returns to the neutral position (C), the hydraulic oil in the 1 st pressure chamber 16a is discharged to the hydraulic tank T via the communication passage 13a, the valve-side passage 14a, the supply/discharge passage 22a, and the directional control valve 3. At this time, since the working oil flowing in the communication passage 13a is restricted from flowing by the orifice 12a, the working oil is slowly discharged from the 1 st pressure chamber 16 a. As a result, the spool 110 of the control valve 11 is slowly returned to the neutral position, and therefore, the hydraulic motor 2 is prevented from being stopped suddenly, and a shock generated when the hydraulic motor is stopped is suppressed.

When the spool 110 of the control valve 11 returns to the neutral position, the hydraulic oil in the parking brake 2a is discharged to the hydraulic tank T, and a braking force is applied to the hydraulic motor 2 by the biasing force of the spring. Thereby, the parking brake is applied to the construction machine.

As described above, in the valve device 10, as shown in fig. 2, the coil spring 9 that biases the spool 110 in the axial direction and the spring piece 130 that transmits the biasing force of the coil spring 9 to the spool 110 are housed in the housing chamber 122, and the housing chamber 122 is formed in the housing 20. The coil spring 9 and the spring piece 130 are inserted from the through hole 123 and arranged in the housing chamber 122, and the through hole 123 is closed by the plug 140.

Here, when the outer shape of the spring piece 130 is a circular shape, the through hole 123 needs to be formed so that the inner diameter thereof is larger than the outer diameter of the spring piece 130. As a result, the plug 140 attached to the through-hole 123 becomes large. If the plug 140 screwed into the opening end of the valve accommodating hole 120 of the control valve 11 is large, it may be necessary to widen the interval between the valve accommodating hole 120 and a valve accommodating hole formed in the vicinity thereof (for example, an accommodating hole for accommodating a spool of the

check valves

17a and 17b (see fig. 1)), and as a result, the valve device 10 may become large. Further, the plug 150 (see fig. 1) that is screwed to the opening end of the valve housing hole (e.g., the housing hole of the valve body that houses the

check valves

17a and 17b (see fig. 1)) not provided with the spring piece cannot be made common, and this may also lead to an increase in cost.

In contrast, as shown in fig. 3, the spring piece 130 of the present embodiment has a non-circular outer shape in which the 1 st outer dimension (outer dimension in the 1 st direction) X is larger than the inner diameter Dh of the through hole 123 and the 2 nd outer dimension (outer dimension in the 2 nd direction) Y is smaller than the inner diameter Dh of the through hole 123.

The spring piece 130 of the present embodiment is formed in an elliptical shape, and the length of the major axis, i.e., the major axis length, corresponds to the 1 st outer dimension X, and the length of the minor axis orthogonal to the major axis, i.e., the minor axis length, corresponds to the 2 nd outer dimension Y.

In this way, the spring piece 130 of the present embodiment is formed such that the 2 nd outer dimension Y, which is the maximum outer dimension in at least one direction, is smaller than the inner diameter Dh of the through hole 123. As a result, as shown in fig. 4, the spring piece 130 can be obliquely passed through the through hole 123 and disposed in the housing chamber 122, and therefore, the inner diameter Dh of the through hole 123 and the plug 140 attached to the through hole 123 can be reduced in size. As a result, the valve device 10 can be downsized.

Further, by using the same plug as another plug (for example, a small plug 150 attached to the opening end of the valve receiving hole of the

check valve

17a, 17b shown in fig. 1) as the plug 140, it is possible to reduce the cost by the universal use of parts. Further, since the degree of freedom in selecting the size of the plug 140 is increased, the cost reduction by using a standard component can be achieved.

As shown in fig. 2, the inner diameter Dc of the storage chamber 122 is larger than the inner diameter Dh of the through-hole 123. As a result, as shown in fig. 3, the 1 st outer dimension X of the spring piece 130 can be made larger than the inner diameter Dh of the through hole 123.

Further, the 1 st outer dimension X of the spring piece 130 is larger than the outer diameter Ds of the coil spring 9. In the present embodiment, as shown in fig. 2, the spring piece 130 is configured to abut against the step portion 119 of the spool 110, and the 1 st outer dimension X of the spring piece 130 is larger than the outer diameter of the body portion 111 (the outer diameter of the step portion 119). That is, the spring piece 130 is formed such that both end portions in the 1 st direction thereof protrude outward from the stepped portion 119. With this configuration, the spring piece 130 can secure a sufficient area on which the biasing force of the coil spring 9 acts. As a result, the biasing force of the coil spring 9 can be stably transmitted to the spool 110 via the spring piece 130.

According to the above embodiment, the following operational effects are exhibited.

The spring piece 130 has a non-circular shape in which the 1 st outer dimension X is larger than the inner diameter Dh of the through hole 123 and the 2 nd outer dimension Y is smaller than the inner diameter Dh of the through hole 123. Therefore, the spring piece 130 can be obliquely passed through the through hole 123 and disposed in the housing chamber 122, and therefore, the inner diameter Dh of the through hole 123 and the plug 140 attached to the through hole 123 can be reduced in size.

In the present embodiment, since the spring piece 130 has a simple elliptical shape, the manufacturing cost of the spring piece 130 can be reduced.

The following modifications are also within the scope of the present invention, and the configurations shown in the modifications and the configurations described in the above embodiments may be combined, or the configurations described in the following different modifications may be combined with each other.

< modification 1 >

In the above embodiment, the example in which the spring piece 130 has an elliptical shape has been described, but the present invention is not limited to this. The spring piece 130 may have a non-circular shape in which the 1 st outer dimension X is larger than the inner diameter Dh of the through hole 123 and the 2 nd outer dimension Y is smaller than the inner diameter of the through hole 123. For example, as shown in fig. 5, the spring piece 230 may be formed in an outline in which corner portions of a rectangle are cut off.

< modification 2 >

In the above-described embodiment, an example was described in which the length of the major axis parallel to the 1 st direction (major axis length) corresponds to the 1 st outer dimension X, and the length of the minor axis parallel to the 2 nd direction orthogonal to the 1 st direction (minor axis length) corresponds to the 2 nd outer dimension Y, but the present invention is not limited thereto. As shown in fig. 6, the 1 st direction, which is the reference of the 1 st outer dimension X, may not be orthogonal to the 2 nd direction, which is the reference of the 2 nd outer dimension Y. The spring piece 330 may have a shape in which the minimum value of the outer dimension (the 2 nd outer dimension Y) is smaller than the inner diameter Dh of the through hole 123 and the maximum value of the outer dimension (the 1 st outer dimension X) is larger than the inner diameter Dh of the through hole 123.

< modification 3 >

In the above-described embodiment, an example in which the present invention is applied to a back pressure valve device for suppressing an impact at the time of starting and stopping a construction machine including a hydraulic motor as a travel motor has been described, but the present invention is not limited thereto. The present invention may be applied to a valve device for suppressing a situation in which a boom or the like of a construction machine is suddenly lowered due to its own weight when the boom is operated in a downward direction. The valve device is not limited to the back pressure valve device. For example, the present invention may be applied to an anti-reverse valve device for preventing reverse operation of a hydraulic motor used as a swing motor of a swing device of a construction machine.

< modification 4 >

In the above embodiment, the valve device in which the valve body urged by the spring is the spool has been described, but the present invention is not limited to this. The present invention can be applied to a valve device having various valve elements such as a poppet valve as a valve element biased by a spring.

The structure, operation, and effects of the embodiments of the present invention configured as described above will be summarized.

The valve device 10 includes: a housing 20; a valve body (spool 110) housed in the case 20; an urging member (coil spring 9) that urges the valve body (spool 110); annular plate members (

spring pieces

130, 230, 330) which are disposed between the valve body (spool 110) and the biasing member (coil spring 9) and transmit the biasing force of the biasing member (coil spring 9) to the valve body (spool 110); a housing chamber 122 formed in the housing 20 and housing the biasing member (coil spring 9) and the sheet member (

spring sheet

130, 230, 330); a through hole 123 penetrating from an end surface of the housing 20 to the housing chamber 122; and a plug member (plug 140) attached to the through-hole 123 and closing the through-hole 123, wherein the sheet member (

spring sheet

130, 230, 330) has a non-circular shape in which a 1 st outer dimension X is larger than an inner diameter Dh of the through-hole 123 and a 2 nd outer dimension Y is smaller than the inner diameter Dh of the through-hole 123.

In this configuration, since the sheet members (the

spring pieces

130, 230, and 330) can be obliquely passed through the through-hole 123 and disposed in the housing chamber 122, the inner diameter of the through-hole 123 and the plug member (the plug 140) attached to the through-hole 123 can be reduced in size.

In the valve device 10, the sheet member (spring sheet 130) has an elliptical shape with a longitudinal axis length of the 1 st outer dimension X and a short axis length of the 2 nd outer dimension Y.

In this configuration, since the sheet member (the spring piece 130) has a simple elliptical shape, the manufacturing cost of the sheet member (the spring piece 130) can be reduced.

In the valve device 10, the inner diameter of the housing chamber 122 is larger than the inner diameter Dh of the through hole 123.

In the valve device 10, the biasing member is the coil spring 9, and the 1 st outer dimension X of the leaf member (the

spring piece

130, 230, 330) is larger than the outer diameter Ds of the coil spring 9.

In the valve device 10, the spool is a spool 110, and the spool 110 includes: a body portion 111 that slides in a valve post hole 121 of the housing 20; and a protrusion 112 protruding from the body 111 in the axial direction, the protrusion 112 having an outer diameter smaller than that of the body 111, a step 119 for the sheet member (

spring piece

130, 230, 330) to abut against is formed between the body 111 and the protrusion 112, and the 1 st outer dimension X of the sheet member (

spring piece

130, 230, 330) is larger than the outer diameter of the body 111.

In the case of the above-described configuration, the area on which the biasing force of the biasing member (coil spring 9) acts can be sufficiently ensured in the sheet members (

spring pieces

130, 230, 330). As a result, the biasing force of the biasing member (coil spring 9) can be stably transmitted to the valve body (spool 110) via the sheet members (

spring pieces

130, 230, 330).

While the embodiments of the present invention have been described above, the above embodiments are merely some of application examples of the present invention, and the scope of the present invention is not intended to be limited to the specific configurations of the above embodiments.

The application claims priority based on application 2019 and 059169 filed from the franchise of the country on 3 and 26 th 2019, and the entire content of the application is incorporated into the specification by reference.

Claims

1. A valve device, wherein,

the valve device includes:

a housing;

a valve element housed in the housing;

a biasing member that biases the valve element;

an annular sheet member disposed between the valve body and the biasing member, the sheet member transmitting the biasing force of the biasing member to the valve body;

a housing chamber formed in the housing and housing the urging member and the sheet member;

a through hole penetrating from an end surface of the housing to the housing chamber; and

a sealing member attached to the through hole to seal the through hole,

the sheet member has a non-circular shape with a 1 st outer dimension larger than the inner diameter of the through hole and a 2 nd outer dimension smaller than the inner diameter of the through hole.

2. The valve apparatus of claim 1,

the sheet member is an elliptical shape having a major axis length of the 1 st outer dimension and a minor axis length of the 2 nd outer dimension.

3. The valve apparatus of claim 1,

the inner diameter of the storage chamber is larger than the inner diameter of the through hole.

4. The valve apparatus of claim 1,

the force-applying member is a coil spring,

the 1 st outer dimension of the sheet member is larger than an outer diameter of the coil spring.

5. The valve apparatus of claim 1,

the valve core is a valve column, and the valve core is a valve rod,

the spool has:

a body portion that slides in a spool hole of the housing; and

a protruding portion protruding from the main body portion in an axial direction,

an outer diameter of the protruding portion is smaller than an outer diameter of the main body portion, a step portion against which the sheet member abuts is formed between the main body portion and the protruding portion,

the 1 st outer dimension of the sheet member is larger than an outer diameter of the main body portion.