CN112005034A - valve device - Google Patents

Abstract

A valve device (10) includes: a casing (20); a valve core (110) accommodated in the casing (20); a urging member (9) urging the valve core (110); an annular sheet member (130), which is arranged between the valve core (110) and the urging member (9), and transmits the urging force of the urging member (9) to the valve core (110); and a storage chamber (122), which is formed in the case a body (20) that accommodates the urging member (9) and the sheet member (130); a through hole (123) that penetrates from the end face of the housing (20) to the accommodation chamber (122); and a blocking member (140), It is mounted on the through hole (123), and the through hole (123) is blocked. The sheet member (130) has a first outer dimension larger than the inner diameter (Dh) of the through hole (123) and a second outer dimension smaller than the through hole (123) The inner diameter (Dh) of the non-circular shape.

Description

valve device

technical field

The present invention relates to a valve device.

Background technique

Japanese JP2018-119664A describes a valve device including: a spool inserted into a valve housing hole formed in a housing as a valve body; and springs provided at both ends of the spool to The spool remains in the neutral position.

In this valve device, in a pilot chamber formed by the valve accommodating hole, the plug serving as the closing member screwed to the opening end of the valve accommodating hole, and the end face of the spool, the spring and the valve spool arranged between the spring and the spool are accommodated. leaf spring.

SUMMARY OF THE INVENTION

In the valve device described in Japanese JP2018-119664A, in order to insert the spring and the spring piece into the pilot chamber from the open end of the valve accommodation hole, it is necessary to increase the diameter of the open end of the valve accommodation hole. As a result, there is a problem that the plugging member screwed to the opening end of the valve housing hole becomes large.

An object of the present invention is to reduce the size of the plugging member.

According to one aspect of the present invention, a valve device includes: a housing; a valve core accommodated in the housing; a biasing member for biasing the valve core; an annular sheet member disposed between the valve core and the biasing member In between, the sheet member transmits the urging force of the urging member to the valve core; a housing chamber, which is formed in the housing, accommodates the urging member and the sheet member; a through hole that penetrates from the end face of the housing to the housing chamber; and The blocking member is attached to the through hole to close the through hole, and the sheet member has a non-circular shape having a first outer dimension larger than an inner diameter of the through hole and a second outer dimension smaller than the inner diameter of the through hole.

Description of 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 an enlarged partial cross-sectional view showing part II of FIG. 1 in an enlarged manner.

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

FIG. 4 is a diagram illustrating a method of arranging a spring piece in a storage chamber.

FIG. 5 is a diagram showing a spring piece of the valve device according to Modification 1 of the present embodiment.

FIG. 6 is a diagram showing a spring piece of a valve device according to Modification 2 of the present embodiment.

Detailed ways

The valve device 10 according to the 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 in order to suppress shocks generated at the time of starting and stopping, for example, in a drive circuit of a hydraulic motor constituting a traveling device of a construction machine such as a hydraulic excavator and a wheel loader.

A fluid pressure control device 100 including the valve device 10 will be described with reference to FIG. 1 . In the fluid pressure control device 100, hydraulic oil is used as the working fluid, but other fluids such as 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 oil and a hydraulic motor 2 serving as 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 hydraulic oil from the hydraulic pump 1 to the hydraulic motor 2 to switch the working direction (rotation direction) of the hydraulic motor 2; and a valve device 10 that is provided for switching the connection direction A pair of supply and discharge flow paths 22a, 22b of the valve 3 and the hydraulic motor 2.

The hydraulic motor 2 is used as a hydraulic motor for traveling. The hydraulic motor 2 is supplied with hydraulic oil discharged from the hydraulic pump 1 and is rotationally driven. The hydraulic motor 2 is switched to forward rotation or reverse rotation by the direction switching valve 3 . When the hydraulic motor 2 rotates in the forward direction, the construction machine is moved forward, and when the hydraulic motor 2 is rotated in the reverse direction, the construction machine is moved backward.

In addition, the construction machine includes a passive parking brake 2a to which the brake release flow path 23 is connected. The parking brake 2a is structured such that when the pressure in the brake release passage 23 is lower than the brake release pressure, the brake is actuated by the force of the spring, and when the pressure in the brake release passage 23 becomes the brake release pressure or more, The brake is released by moving the piston against the force of the spring.

The direction switching valve 3 has a forward position (A) in which the hydraulic oil discharged from the hydraulic pump 1 is guided to the hydraulic motor 2 through the supply and discharge flow path 22a, and the hydraulic oil discharged from the hydraulic pump 1 is directed to the hydraulic motor 2 through the supply and discharge flow path 22b. The retracted position (B) in which the hydraulic motor 2 is guided, and the neutral position (C) in which the hydraulic pump 1 and the hydraulic motor 2 are communicated with the working fluid tank T. The direction switching valve 3 is switched by the pilot pressure guided to the pilot chambers 3a and 3b in accordance with the operation of the operating lever.

The valve device 10 includes a casing 20 having a rectangular parallelepiped shape. The casing 20 is formed with valve-side passages 14a and 14b communicating with the direction switching valve 3 through the supply and discharge flow passages 22a and 22b, and actuator side passages 15a and 15a communicating with the hydraulic motor 2 through the supply and discharge flow passages 22a and 22b. 15b.

The valve device 10 includes: a control valve 11 that controls the flow of 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 a check valve 17a , 17b, which allow only the flow from the valve-side passages 14a, 14b toward the actuator-side passages 15a, 15b.

The control valve 11 includes: a spool 110 as a valve body accommodated in a valve accommodation hole 120 formed so as to penetrate the housing 20; Open ends (through holes 123 to be described later) on both sides in the axial direction of the hole 120; the first coil spring 9a and the second coil spring 9b are provided at both ends of the spool 110, respectively, and hold the spool 110 in a neutral position ; And the first spring piece 130a and the second spring piece 130b, which are arranged between the spool 110 and the first coil spring 9a and between the spool 110 and the second coil spring 9b. The first spring piece 130 a and the second spring piece 130 b are annular piece members that transmit the urging force of the first coil spring 9 a and the urging force of the second coil spring 9 b to the spool 110 .

A first pressure chamber 16 a is provided on one side in the axial direction of the spool 110 , and a second pressure chamber 16 b is provided on the other side in the axial direction of the spool 110 . The first pressure chamber 16a and the second pressure chamber 16b are respectively formed by the valve housing hole 120 of the casing 20 and the first plug 140a and the second plug attached to the open end (through hole 123 described later) of the valve housing hole 120 . 140b, and the end of the spool 110 are formed.

The valve accommodating hole 120 has a spool hole 121 through which the spool 110 slides, a first accommodating chamber 122a and a second accommodating chamber 122a for accommodating the first coil spring 9a and the second coil spring 9b and the first spring piece 130a and the second spring piece 130b The chamber 122b and the first through-hole 123a and the second through-hole 123b which penetrate from the end face of the casing 20 to the first storage chamber 122a and the second storage chamber 122b. The first through hole 123 a and the second through hole 123 b have an inner diameter slightly larger than the outer diameter of the spool 110 in order to allow the spool 110 to penetrate from the outside of the housing 20 .

The valve device 10 is formed in a left-right symmetrical shape. Therefore, below, the 1st coil spring 9a and the 2nd coil spring 9b are collectively called the coil spring 9, and the 1st spring piece 130a and the 2nd spring piece 130b are collectively called the spring piece 130. In addition, the first storage chamber 122a and the second storage chamber 122b are collectively referred to as the storage chamber 122, the first through-hole 123a and the second through-hole 123b are collectively referred to as the through-hole 123, and the first plug 140a and the second plug 140b. Collectively referred to as plugs 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 central axis of the spool 110 , respectively.

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 against the end face of the housing 20 and a rod portion 142 protruding from the flange 141 . The diameter of the rod portion 142 is smaller than the diameter of the flange 141 , and the outer periphery of the rod portion 142 is formed with a male thread to be threadedly engaged with the female thread of the through hole 123 . The plug 140 is attached to the through hole 123 by screwing the rod portion 142 to the through hole 123 . A sealing member is arranged between the flange 141 and the opening end of the through hole 123 , and the 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 as the spool 110 moves in the axial direction, thereby increasing/decreasing the urging force applied to the spool 110 . As shown in FIG. 1, the 1st coil spring 9a is arrange|positioned in the 1st pressure chamber 16a in the compressed state, and the 2nd coil spring 9b is arrange|positioned in the 2nd pressure chamber 16b in the compressed state. The first coil spring 9a urges the spool 110 against the urging force applied to the spool 110 by the hydraulic fluid in the second pressure chamber 16b. The second coil spring 9b urges the spool 110 against the urging force applied to the spool 110 by the hydraulic fluid in the first pressure chamber 16a.

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

The protruding portion 112a restricts the maximum movement amount (maximum stroke) of the spool 110 to one side in the axial direction (leftward in the figure) by contacting the first plug 140a. The protruding portion 112b restricts the maximum movement amount (maximum stroke) of the spool 110 to the other side in the axial direction (rightward in the figure) by contacting the second plug 140b.

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 protruding portion 112 is smaller than the outer diameter of the main body portion 111 . Therefore, a stepped 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 stepped portion 124 of the housing 20 and the stepped portion 119 of the spool 110 function as abutting portions against which the spring pieces 130 come into contact.

The coil spring 9 is arranged so that the protrusion 112 is inserted inside. An annular spring piece 130 is arranged between the stepped 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 arranged in a state in which one end is in contact with the spring piece 130 and the other end is in contact with the plug 140 , and the spool 110 is urged in the axial direction by the spring piece 130 .

As shown in FIG. 1, a communication passage 13a and a communication passage 13b are provided inside the spool 110; regardless of the position of the spool 110, the above-mentioned communication passage 13a always communicates the valve side passage 14a and the first 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 second pressure chamber 16b. The communication passages 13a and 13b are provided with orifices 12a and 12b which restrict the flow by applying resistance to the flow of the passing hydraulic oil.

The spool 110 moves in the axial direction according to the pressure of the first pressure chamber 16a and the pressure of the second pressure chamber 16b. When the pressure difference between the first pressure chamber 16a and the second pressure chamber 16b is smaller than a predetermined value, the spool 110 is held in the position shown in FIG. 1 by the first coil spring 9a and the second coil spring 9b as centering springs. shown neutral position. At this time, since the first spring piece 130a abuts against the stepped portion 124 (124a) of the housing 20 and the second spring piece 130b abuts against the stepped portion 124 (124b) of the housing 20, the neutrality of the spool 110 is improved. The positioning accuracy of the location.

When the pressure of the first pressure chamber 16a rises higher than the pressure of the second pressure chamber 16b and the pressure difference therebetween becomes a predetermined value or more, the spool 110 moves to the right in the drawing. At this time, since the first spring piece 130a abuts on the stepped portion 124 ( 124a ) of the housing 20 , the movement of the first spring piece 130a is restricted, and thus the first spring piece 130a is separated from the stepped portion 119 ( 119a ) of the spool 110 . Further, the second spring piece 130b is pressed by the stepped portion 119 ( 119 b ) of the spool 110 and moved to the right in the drawing, and is separated from the stepped portion 124 ( 124 b ) of the housing 20 . Therefore, the second coil spring 9b contracts with the movement of the second spring piece 130b.

When the pressure of the second pressure chamber 16b rises higher than the pressure of the first pressure chamber 16a and the pressure difference therebetween becomes a predetermined value or more, the spool 110 moves to the left in the figure. At this time, since the second spring piece 130b is in contact with the stepped portion 124 ( 124b ) of the housing 20 , the movement of the second spring piece 130b is restricted, so the second spring piece 130b is separated from the stepped portion 119 ( 119b ) of the spool 110 . Further, the first spring piece 130a is pressed by the stepped portion 119 ( 119 a ) of the spool 110 to move to the left in the drawing, and is separated from the stepped portion 124 ( 124 a ) of the housing 20 . Therefore, the first coil spring 9a contracts with the movement of the first spring piece 130a.

When the direction switching valve 3 is in the neutral position (C), the first pressure chamber 16a and the second pressure chamber 16b communicate with the working fluid tank T. Therefore, the control valve 11 is held in the neutral position as shown in the figure by the urging force of the first coil spring 9a and the second coil spring 9b provided on both sides.

When the direction switching valve 3 is switched to the forward position (A), in the control valve 11 , the hydraulic oil discharged from the hydraulic pump 1 is guided to the first pressure via the supply and discharge passage 22a, the valve side passage 14a, and the communication passage 13a. chamber 16a, and the spool 110 moves to the right in the drawing. When the direction switching valve 3 is switched to the reverse position (B), in the control valve 11 , the hydraulic oil discharged from the hydraulic pump 1 is guided to the second pressure via the supply and discharge passage 22b, the valve-side passage 14b, and the communication passage 13b chamber 16b, and the spool 110 moves to the left in the drawing.

Next, the operation of the valve device 10 and the operation of the fluid pressure control device 100 when the construction machine is moved forward will be described as an example of the operation of the valve device 10 and the operation of the fluid pressure control device 100 .

When the operator operates the operation lever toward the forward side, the pilot pressure corresponding to the operation amount is guided to the pilot chamber 3a. Thereby, the direction switching 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 and discharge passage 22a.

A part of the hydraulic oil that has flowed into the valve-side passage 14a of the valve device 10 flows into the first pressure chamber 16a via the communication passage 13a. As a result, the spool 110 of the control valve 11 moves to the right in the drawing. At this time, since the flow of the hydraulic oil flowing in the communication passage 13a is restricted by the throttle 12a, it gradually flows into the first pressure chamber 16a. As a result, the spool 110 of the control valve 11 is gradually moved to the right in the drawing.

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

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

When the directional switching valve 3 returns to the neutral position (C), the hydraulic fluid in the first pressure chamber 16a is discharged to the working fluid tank T via the communication passage 13a, the valve side passage 14a, the supply and discharge passage 22a, and the directional switching valve 3. At this time, since the flow of the hydraulic oil flowing in the communication passage 13a is restricted by the throttle 12a, the hydraulic oil is gradually discharged from the first pressure chamber 16a. As a result, the spool 110 of the control valve 11 is gradually returned to the neutral position, so that the situation in which the hydraulic motor 2 is suddenly stopped is prevented, and the shock generated during the stop is suppressed.

Further, 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 fluid tank T, and a braking force is applied to the hydraulic motor 2 by the urging 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 accommodated in the housing A 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 storage chamber 122 , and the through hole 123 is closed with 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, there is a problem that the plug 140 attached to the through hole 123 becomes large. If the plug 140 screwed to the opening end of the valve housing hole 120 of the control valve 11 is large, it may be necessary to widen the valve housing hole 120 and the valve housing hole formed in the vicinity thereof (for example, housing the check valves 17a and 17b (refer to As a result, there is a possibility that the valve device 10 may increase in size due to the interval between the valve body housing holes) in FIG. 1 . In addition, common use with the plug 150 (see FIG. 1 ) that is screwed to the opening end of a valve receiving hole not provided with a spring piece (for example, the receiving hole for receiving the valve body of the check valves 17a and 17b (see FIG. 1 )) cannot be achieved. It may also lead to higher costs.

On the other hand, as shown in FIG. 3 , the outer shape of the spring piece 130 of the present embodiment is set such that the first outer dimension (outer dimension in the first direction) X is larger than the inner diameter Dh of the through hole 123 and the second outer dimension (the second outer dimension) The outer dimension in the direction) Y is smaller than the non-circular shape of the inner diameter Dh of the through hole 123 .

In addition, the outer shape of the spring piece 130 of the present embodiment is formed in an elliptical shape, the length of the major axis, that is, the length of the major axis corresponds to the first outer dimension X, and the length of the minor axis perpendicular to the major axis, that is, the length of the minor axis corresponds to the first outer dimension X. 2 External dimension Y.

In this way, the spring piece 130 of the present embodiment is formed so that the second outer dimension Y, which is the largest outer dimension in at least one direction, is smaller than the inner diameter Dh of the through hole 123 . Thereby, as shown in FIG. 4 , the spring piece 130 can pass through the through hole 123 obliquely and be disposed in the housing chamber 122 , so that the inner diameter Dh of the through hole 123 and the size of the plug 140 attached to the through hole 123 can be reduced. As a result, the valve device 10 can also be reduced in size.

In addition, by using the same plug as the plug 140 as other plugs (for example, the small plug 150 attached to the opening end of the valve housing hole of the check valves 17a and 17b shown in FIG. 1 ) as the plug 140, it is possible to pass Cost reduction due to common use of parts. In addition, since the degree of freedom in selecting the size of the plug 140 is increased, cost reduction by using standard components can also be achieved.

As shown in FIG. 2 , the inner diameter Dc of the housing chamber 122 is larger than the inner diameter Dh of the through hole 123 . Thereby, as shown in FIG. 3 , the first outer dimension X of the spring piece 130 can be made larger than the inner diameter Dh of the through hole 123 .

Further, the first outer dimension X of the spring piece 130 is larger than the outer diameter Ds of the coil spring 9 . Furthermore, in the present embodiment, as shown in FIG. 2 , the spring piece 130 is in contact with the stepped portion 119 of the spool 110 , and the first external dimension X of the spring piece 130 is larger than the outer diameter (the stepped portion) of the main body portion 111 . 119 outside diameter). That is, the spring piece 130 is formed so that both end portions in the first direction protrude outward from the stepped portion 119 . According to such a configuration, it is possible to sufficiently secure an area on the spring piece 130 to which the biasing force of the coil spring 9 acts. As a result, the urging force of the coil spring 9 can be stably transmitted to the spool 110 via the spring piece 130 .

According to the above-described embodiment, the following effects are obtained.

The spring piece 130 has a non-circular shape in which the first outer dimension X is larger than the inner diameter Dh of the through hole 123 and the second outer dimension Y is smaller than the inner diameter Dh of the through hole 123 . Therefore, the spring piece 130 can be disposed in the housing chamber 122 by passing through the through hole 123 obliquely, so that the inner diameter Dh of the through hole 123 and the size of the plug 140 attached to the through hole 123 can be reduced.

In addition, in this 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 may be combined with the configurations described in the above-described embodiments, or the configurations described in different modifications below may be combined with each other.

<Variation 1>

In the above-described embodiment, the example in which the spring piece 130 is elliptical 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 first outer dimension X is larger than the inner diameter Dh of the through hole 123 and the second 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 outer shape in which a rectangular corner portion is cut away.

<Variation 2>

In the above-mentioned embodiment, the length of the long axis parallel to the first direction (long axis length) corresponds to the first external dimension X and the length of the short axis parallel to the second direction orthogonal to the first direction (short axis length). The example in which the length) corresponds to the second external dimension Y has been described, but the present invention is not limited to this. As shown in FIG. 6 , the first direction serving as a reference for the first external dimension X and the second direction serving as a reference for the second external dimension Y may not be perpendicular to each other. The spring piece 330 may have a shape in which the minimum outer dimension (second outer dimension Y) is smaller than the inner diameter Dh of the through hole 123 and the maximum outer dimension (first outer dimension X) is larger than the inner diameter Dh of the through hole 123 .

<Variation 3>

In the above-mentioned embodiment, the example in which the present invention is applied to the back pressure valve device for suppressing shock at the time of starting and stopping of the construction machine including the hydraulic motor as the travel motor has been described, but the present invention It is not limited to this. The present invention can also be applied to a valve device for suppressing a situation in which a boom of a construction machine or the like is rapidly lowered due to its own weight when the boom of the construction machine is operated in the lowering direction. In addition, the valve device is not limited to the back pressure valve device. For example, the present invention can also 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.

<Variation 4>

In the above-described 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 bodies such as a poppet valve as a spring-biased valve body.

The structure, action, and effect of the embodiment of the present invention configured as described above will be collectively described.

The valve device 10 includes: a housing 20; a valve body (spool 110) accommodated in the housing 20; an urging member (coil spring 9) that urges the valve body (spool 110); an annular sheet member (spring pieces 130 , 230 , 330 ) are arranged between the valve body (spool 110 ) and the biasing member (coil spring 9 ), and apply the biasing force of the biasing member (coil spring 9 ) to the valve body (spool 9 ) 110) transmission; storage chamber 122, which is formed in the housing 20, and houses the biasing member (coil spring 9) and the sheet member (spring sheets 130, 230, 330); The housing chamber 122 ; and the blocking member (plug 140 ), which is attached to the through hole 123 to block the through hole 123 , and the sheet member (spring pieces 130 , 230 , 330 ) has a first external dimension X larger than the through hole 123 A non-circular shape in which the inner diameter Dh and the second outer dimension Y are smaller than the inner diameter Dh of the through hole 123 .

In the case of this configuration, since the sheet members (spring pieces 130 , 230 , 330 ) can pass through the through-hole 123 obliquely and be disposed in the storage chamber 122 , the inner diameter of the through-hole 123 and the seal attached to the through-hole 123 can be obtained. Miniaturization of the blocking member (plug 140).

In the valve device 10 , the piece member (spring piece 130 ) has an elliptical shape whose long axis is the first external dimension X and the short axis is the second external dimension Y.

In the case of this structure, since the leaf member (spring piece 130 ) has a simple elliptical shape, the manufacturing cost of the leaf member (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 first outer dimension X of the leaf members (spring pieces 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 has: a main body portion 111 that slides in a spool hole 121 of the housing 20; The outer diameter of the protruding portion 112 is smaller than the outer diameter of the main body portion 111, and between the main body portion 111 and the protruding portion 112, a stepped portion 119 is formed for the contact of the sheet-feeding members (spring pieces 130, 230, 330). 130, 230, 330) of the first outer dimension X is larger than the outer diameter of the main body portion 111.

In the case of the above-mentioned structure, the area to which the biasing force of the biasing member (coil spring 9 ) acts can be sufficiently secured in the sheet members (spring pieces 130 , 230 , 330 ). As a result, the urging force of the urging member (coil spring 9 ) can be stably transmitted to the valve body (spool 110 ) via the piece members (spring pieces 130 , 230 , 330 ).

The embodiments of the present invention have been described above, but the above-described embodiments merely illustrate some application examples of the present invention, and are not intended to limit the scope of the present invention to the specific configurations of the above-described embodiments.

This application claims priority based on Japanese Patent Application No. 2019-059169 filed with the Japan Patent Office on March 26, 2019, the entire contents of which are incorporated herein by reference.

Claims (5)

1. A valve device wherein, The valve arrangement includes: case; a valve core, which is accommodated in the housing; a force applying member that applies force to the valve core; an annular sheet member disposed between the valve body and the urging member, the sheet member transmitting the urging force of the urging member to the valve body; an accommodation chamber formed in the casing and accommodating the biasing member and the sheet member; a through hole penetrating from the end face of the casing to the storage chamber; and a blocking member mounted on the through hole to block the through hole, The sheet member has a non-circular shape having a first outer dimension larger than an inner diameter of the through hole and a second outer dimension smaller than the inner diameter of the through hole. 2. The valve arrangement of claim 1, wherein: The sheet member has an elliptical shape whose major axis is the first outer dimension and whose minor axis is the second outer dimension. 3. The valve arrangement of claim 1, wherein: The inner diameter of the storage chamber is larger than the inner diameter of the through hole. 4. The valve arrangement of claim 1, wherein: the urging member is a coil spring, The first outer dimension of the sheet member is larger than the outer diameter of the coil spring. 5. The valve arrangement of claim 1, wherein: The spool is a spool, The spool has: a body portion that slides in a spool bore of the housing; and a protruding portion protruding from the main body portion in the axial direction, The outer diameter of the protruding portion is smaller than the outer diameter of the main body portion, and a stepped portion for the abutment of the sheet member is formed between the main body portion and the protruding portion, The first outer dimension of the sheet member is larger than the outer diameter of the main body portion.

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