WO2017212681A1 - Spool valve - Google Patents
Spool valve Download PDFInfo
- Publication number
- WO2017212681A1 WO2017212681A1 PCT/JP2017/004256 JP2017004256W WO2017212681A1 WO 2017212681 A1 WO2017212681 A1 WO 2017212681A1 JP 2017004256 W JP2017004256 W JP 2017004256W WO 2017212681 A1 WO2017212681 A1 WO 2017212681A1
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- WO
- WIPO (PCT)
- Prior art keywords
- spool
- cap
- guide groove
- valve
- hole
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/316—Guiding of the slide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
Definitions
- This invention relates to a spool valve.
- a conventional spool valve is disclosed in JP2003-09739A.
- a spool hole is formed in the valve housing, and a spool for controlling a working fluid of an actuator (not shown) is slidably incorporated in the spool hole.
- a spool end provided so as to protrude from the valve housing is assembled to one end portion of the spool. The spool end is accommodated in a cap attached to the valve housing via a spacer.
- a guide groove is provided in the spool along the axial direction, and a rotation stop member is provided on the inner surface of the spacer so as to face the guide groove.
- the rotation-preventing member is inserted into the guide groove, allows the spool to move in the axial direction, and prevents rotation of the spool in the circumferential direction by contacting the guide groove.
- the guide groove formed in the spool has a predetermined axial length corresponding to the stroke of the spool. Therefore, when the spool is stroked, the guide groove may interfere with (communicate with) the oil passage formed in the valve housing. In such a case, there is a possibility that appropriate control by the spool valve cannot be performed.
- the valve housing is enlarged or another member such as a spacer is provided corresponding to the length of the spool stroke. It is done. However, in this case, the spool valve becomes large.
- An object of the present invention is to provide a spool valve which prevents the spool valve from rotating in the circumferential direction by preventing the spool valve from becoming large without changing the center of gravity of the spool.
- the rotation preventing member is coupled to at least one end of the spool provided in the valve housing.
- a guide groove extending in the axial direction of the spool is provided on either the inner wall of the cap or the outer periphery of the rotation preventing member.
- a guide convex portion that is relatively movable along the guide groove is provided on either the inner wall of the cap or the outer periphery of the rotation preventing member.
- FIG. 1 is a cross-sectional view of a spool valve according to an embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view of a part of the rotation preventing member of the spool valve according to the embodiment of the present invention.
- FIG. 3 is a side view of the end portion of the spool valve rotation preventing member according to the embodiment of the present invention as seen from the side.
- FIG. 4 is an enlarged cross-sectional view of a spool end and a spool end according to a comparative example of the present invention.
- the spool valve 100 switches the supply and discharge of working fluid such as hydraulic fluid to an actuator (not shown) such as a hydraulic cylinder, for example, and controls the operation of the actuator.
- the spool valve 100 includes a valve housing 1 in which a spool hole 2 is formed, a spool 3 that is slidably incorporated in the spool hole 2, and a first and a second that urge the spool 3 in the axial direction. Second urging units 10 and 30.
- the spool hole 2 is a through hole that opens on both side surfaces 1 a and 1 b of the valve housing 1.
- the valve housing 1 includes first and second supply / discharge passages 4a and 4b for guiding a working fluid supplied to and discharged from the actuator, a pump passage 5 communicating with a pump (not shown), and a tank (not shown).
- Tank passages 6 a and 6 b communicating with (omitted) and a bridge passage 7 communicating with the pump passage 5 are formed.
- the first and second supply / discharge passages 4a and 4b, the tank passages 6a and 6b, and the bridge passage 7 communicate with the spool hole 2, respectively.
- the spool valve 100 switches the communication state between the first and second supply / discharge passages 4a and 4b, the bridge passage 7 and the tank passages 6a and 6b according to the position of the spool 3, and controls the supply and discharge of the working fluid to the actuator. To do.
- the first urging portion 10 includes a first cap 15 attached to the valve housing 1, an anti-rotation member 14 connected to the one end 3 a of the spool 3 and accommodated in the first cap 15, and one end 3 a of the spool 3. And a first spring 13 as a spring provided between the rotation preventing member 14.
- the rotation preventing member 14 is provided so as to protrude from one side surface 1a of the valve housing 1 when the spool 3 is in a neutral position described later.
- the first cap 15 is a separate member from the valve housing 1, and is fixed to the side surface 1 a of the valve housing 1 from which the rotation preventing member 14 protrudes by bolts 16.
- the opening of the side surface 1 a in the spool hole 2 and the rotation preventing member 14 are covered with a first cap 15.
- the rotation preventing member 14 is provided with an end portion 14 a on the opposite side to the spool 3.
- the stroke of the spool 3 in one direction (right direction in FIG. 1) is restricted. That is, the end portion 14 a abuts the inner wall 15 a of the first cap 15, thereby defining one stroke end of the spool 3.
- the first spring 13 is provided between the end 3 a of the spool 3 and the end 14 a of the rotation preventing member 14 via the spring seat 12.
- the first spring 13 presses both ends against the end portion 3a of the spool 3 and the end portion 14a of the rotation preventing member 14, respectively, and biases the spool 3 so as to keep it in the neutral position.
- a pilot port communicating with a pilot passage (not shown) is formed on the lower end side of the inner wall 15a of the first cap 15.
- the pilot port plays a role as a drilling tool insertion hole 20 for attaching a guide projection 19 described later.
- a first pilot chamber 17 is formed in the first cap 15. When the pilot pressure is guided to the first pilot chamber 17, the spool 3 strokes in the left direction in FIG. Further, in the present embodiment, as shown in FIG. 2, the pilot pressure guided to the first pilot chamber 17 is generated by the first spring 13 via the communication hole 14 b provided in the shaft core of the rotation preventing member 14. It is also guided to the provided spring chamber.
- the second urging portion 30 provided on the other end side of the spool 3 (the side opposite to the first urging portion 10) includes a spool end 24 attached to the other end portion 3 b of the spool 3.
- a second cap 25 that accommodates the spool end 24 and is attached to the other side surface 1 b of the valve housing 1, and a second spring 23 provided between the other end 3 b of the spool 3 and the spool end 24.
- the spool end 24 is provided so as to protrude from the valve housing 1.
- the spool end 24 abuts against the inner wall 25a of the second cap 25, thereby restricting the stroke of the spool 3 in the other direction (left direction in FIG. 1).
- the spool end 24 defines the other stroke end of the spool 3 by contacting the inner wall 25a of the second cap 25.
- the second cap 25 covers the other end of the spool end 24 and the spool hole 2 and is fixed to a side surface (the other side surface) of the valve housing 1 from which the spool end 24 protrudes.
- a second pilot chamber 26 is formed in the second cap 25, and pilot pressure is guided from the pilot passage to the second pilot chamber 26, whereby the spool 3 strokes in the right direction in FIG. 1.
- the spool 3 In the spool valve 100, the spool 3 is held in the neutral position by the urging force of the first and second springs 13 and 23 in the first and second urging units 10 and 30. In the neutral position, the communication between the first and second supply / discharge passages 4a and 4b, the bridge passage 7 and the tank passages 6a and 6b is blocked, and the supply and discharge of the working fluid to the actuator is blocked.
- the pilot pressure is introduced to one of the first and second pilot chambers 17 and 26 of the first and second urging units 10 and 30, the spool 3 moves according to the pilot pressure and the position is switched. . By switching the pilot chamber for introducing the pilot pressure, the position of the spool 3 is also switched.
- the spool valve 100 controls the operation of the actuator by switching the working fluid supplied to and discharged from the actuator according to the position. That is, the neutral position is a position in which the pilot pressure is not guided to any of the first and second pilot chambers 17 and 26 and the spool 3 is held by the urging force of the first and second springs 13 and 23. is there.
- the spool valve 100 is formed at the end portion 14 a of the rotation preventing member 14, and has a single guide groove 18 extending along the axial direction of the spool 3 and a position facing the guide groove 18. And a guide protrusion 19 made of a pin member provided on the inner wall 15a of the first cap 15.
- the length of the guide groove 18 is at least twice as long as the length required for the spool 3 to make a full stroke in one direction. That is, the length of the guide groove 18 is at least twice the stroke length of the spool 3 moving from the neutral position to one stroke end.
- the guide groove 18 is formed in the end portion 14 a of the rotation preventing member 14 so as not to communicate with the flow path formed in the valve housing 1 regardless of the position of the spool 3. That is, the guide groove 18 is configured not to communicate with the flow path (for example, the tank passage 6a in the present embodiment) even when the spool 3 is moved to the other stroke end by the pilot pressure in the first pilot chamber 17. Is done.
- the guide convex portion 19 is inserted so as to fit into the guide groove 18.
- the guide protrusion 19 is configured to be movable relative to the guide groove 18 in the axial direction along with the movement of the spool 3. Further, the guide convex portion 19 is provided so as to be located in the middle of the axial length of the guide groove 18 when the spool 3 is in the neutral position.
- the guide groove 18 is formed to be twice or more of the full stroke length, and the guide protrusion 19 is positioned in the axial direction of the guide groove 18 when the spool 3 is in the neutral position.
- the guide projection 19 is locked in the circumferential direction of the spool 3 with respect to the guide groove 18.
- the guide protrusion 19 allows the spool 3 to move in the axial direction as the spool 3 moves, and contacts the guide groove 18 in the circumferential direction to prevent the spool 3 from rotating in the circumferential direction. Act on.
- the guide protrusion 19 provided on the first cap 15 is attached to the inner wall 15a of the first cap 15 using the hole of the hole insertion tool insertion hole 20.
- the punching tool insertion hole 20 is formed at a position facing the guide convex portion 19. In other words, the hole insertion tool insertion hole 20 is spaced apart from the guide projection 19 by 180 ° in the circumferential direction with respect to the rotation center of the spool 3, and the axial position of the spool 3 is substantially the same. Formed at various positions.
- a drill (not shown) is inserted from the opening of the drilling tool insertion hole 20 that penetrates the inner wall 15 a of the first cap 15, and a pin member that becomes the guide convex portion 19 is press-fitted into the inner wall 15 a of the first cap 15.
- a pin hole 21 is formed.
- a pin member is press-fitted into the pin hole 21, and the guide convex portion 19 is provided on the inner wall 15 a of the first cap 15.
- the hole insertion tool insertion hole 20 serves as a pilot port and is provided at a position facing the guide convex portion 19, but the pilot port for guiding the pilot pressure is provided at the side end of the first cap 15. It may be provided at other positions.
- a working hole insertion hole 20 is formed at a position opposite to the location where the pin hole 21 is formed, and the pin hole 21 is formed from the hole insertion hole 20 to the inner wall 15 a of the first cap 15. May be provided. Then, after the guide convex portion 19 is press-fitted into the pin hole 21, the drilling tool insertion hole 20 may be closed with a plug or the like.
- the pinhole 21 can be easily formed through the punching tool insertion hole 20. That is, even if it is a ready-made cap, the pin hole 21 can be formed in the inner wall 15a of the 1st cap 15 which opposes the guide groove 18 if the drilling tool insertion hole 20 can be formed.
- the punching tool insertion hole 20 since the punching tool insertion hole 20 also functions as a pilot port, it is not necessary to block the punching tool insertion hole 20 again after the pin hole 21 is formed. Thus, the hole punching tool insertion hole 20 can be used as it is as a pilot port.
- the first cap 15 is attached so as to cover the rotation preventing member 14 by fitting the guide convex portion 19 into the guide groove 18 formed in the end portion 14a in advance.
- the spool 3 is originally provided so as to be able to rotate in the circumferential direction within the spool hole 2. Therefore, the first cap 15 and the anti-rotation member 14 are in a fixed position in which the valve housing 1 and the first cap 15 are fixed by the bolt 16 with the guide convex portion 19 fitted in the guide groove 18. Rotate. Then, the first cap 15 is fixed to the valve housing 1 with the bolt 16.
- the shape of the guide groove 18 is a concave cross section as shown in FIG. 3, but it is a semicircular cross section or a shape that matches the shape of the protruding portion of the guide convex portion 19. Even more. If the guide convex portion 19 is fitted in the guide groove 18 to allow the spool 3 to move in the axial direction and prevent the spool 3 from rotating in the circumferential direction as the stroke of the spool 3 moves, the guide groove 18 Any shape is acceptable.
- the guide convex portion 19 uses a pin member
- the first cap 15 may be provided with a protrusion in advance to form the guide convex portion 19.
- a spool valve 200 according to a comparative example of the present embodiment will be described with reference to FIG.
- the spool valve 200 according to the comparative example is not included in the technical scope of the present invention.
- a spool hole 102 is formed in the valve housing 101, and a spool 103 is slidably incorporated in the spool hole 102.
- a spool end 104 is assembled to one end of the spool 103.
- the spool end 104 is provided with a spring 106 via spring seats 105, 105.
- the spring 106 is provided via a spring seat 105 between the end of the spool 103 and the bolt 104 a provided at the end of the spool end 104.
- the spring 106 presses both ends of the spring 106 against the end of the spool 103 and the bolt 104a to keep the spool 103 in a neutral position.
- a cap 108 is attached to the side surface of the valve housing 101 on the side where the spool end 104 protrudes through a disc-like spacer 107. The cap 108 covers the spool end 104 assembled to the spool 103.
- a port 109 communicating with a pilot passage (not shown) is formed at the side end of the cap 108.
- the inner diameter of the port 109 is smaller than the inner diameter of the pilot chamber 110.
- one guide groove 111 is formed along the axial direction of the spool 103 on at least one end side of the spool 103.
- the guide groove 111 has a necessary length that allows the spool 103 to perform a full stroke to the left and right.
- a spherical rotation member 112 is provided on the inner surface of the spacer 107 so as to face the guide groove 111.
- the stop member 112 is fitted into the guide groove 111 and allows the spool 103 to move in the axial direction as the stroke of the spool 103 moves.
- the anti-rotation member 112 comes into contact with the guide groove 111 and acts to prevent the spool 103 from rotating in the circumferential direction. In this manner, the rotation stop member 112 acts together with the guide groove 111 so that the rotation of the spool 103 in the circumferential direction does not occur.
- the larger the flow rate of the working fluid the more easily the phenomenon that the spool 103 rotates in the circumferential direction. In particular, such a phenomenon is likely to occur in a spool valve of a large machine.
- a contact portion between the spool hole 102 and the spool 103 is worn, and a gap is generated between them. If a gap is formed in this way, the working fluid cannot be controlled properly.
- the spool valve 200 according to the comparative example is configured such that when the spool 103 has a full stroke, the bolt 104a provided on the side end of the spool end 104 stops without contacting the inner wall 108a of the cap 108.
- the side end portion of the spool end 104 comes into contact with the inner wall 108a of the cap 108 and the stroke operation stops.
- the inner wall 108a of the cap 108 is worn.
- Such wear is caused by the fact that the spool end 104 is harder than the member of the cap 108. If the inner wall 108a of the cap 108 is worn in this way, the spool 103 cannot maintain its normal stroke position.
- the guide groove 111 is formed only at one place on the outer periphery of the spool 103, the rotation center when the spool 103 is rotated and the center of gravity of the spool 103 are shifted. Therefore, for example, when polishing while rotating the spool 103 at a high speed, the spool 103 is bent, and the roundness of the spool 103 is difficult to be obtained. If the true circle of the spool 103 is not maintained, fluid may leak between the spool hole 102 and the spool 103. Further, if the roundness of the spool 103 is not maintained, it may cause a stick that prevents the spool 103 from moving in the axial direction in the spool hole 102.
- the guide groove 111 formed in the spool 103 has a predetermined axial length corresponding to the stroke of the spool 103. Therefore, when the spool 103 is stroked, the guide groove 111 may interfere with (communicate with) the oil passage formed in the valve housing 101. In such a case, there is a possibility that appropriate control cannot be performed.
- the valve housing 101 is enlarged according to the stroke length of the spool 103, or another member such as a spacer is used. It is conceivable to provide it. However, in this case, the spool valve 200 becomes large.
- the guide groove 18 is formed on the outer periphery of the rotation preventing member 14 aligned with the spool 3 in the axial direction, so that the circumferential direction of the spool 3 can be achieved without groove processing on the spool 3 itself. Rotation can be prevented.
- the center of gravity of the spool 3 does not deviate from the rotation center of the spool 3. Therefore, when the outer periphery is polished while rotating the spool 3 at a high speed, the spool 3 is not bent and the roundness of the spool 3 is maintained. Therefore, fluid does not leak between the spool hole 2 and the spool 3 or the spool 3 does not stick.
- the guide groove 18 is formed on the outer periphery of the rotation preventing member 14, even if the spool 3 makes a large stroke, it does not interfere with the oil passage formed in the valve housing 1.
- the length of the guide groove 18 necessary for the full stroke can be ensured while preventing the guide groove 18 from interfering with the oil passage formed in the valve housing 1.
- the working fluid in the flow path is prevented from leaking through the guide groove 18, and appropriate control by the spool valve 100 can be performed.
- the oil passage formed in the valve housing 1 and the guide groove 18 are provided at positions apart from each other and do not interfere with each other, it is not necessary to enlarge the valve housing 1. Therefore, an increase in the size of the spool valve 100 can be prevented.
- the rotation preventing member 14 also serves as a spool end, and a configuration for guiding a pilot pressure or the like can be added.
- a rotation prevention function can be added while functioning similarly to the spool end 104 of the comparative example. Therefore, since it can maintain substantially the same size as the spool end 104 of the comparative example, a groove having a length necessary for a full stroke can be formed without adding new members, and the spool valve 100 can be prevented from being enlarged.
- Such a spool valve 100 is particularly useful for a large machine having a large operating flow rate.
- the guide groove 18 is formed in the rotation preventing member 14, and the guide convex portion 19 is formed on the inner wall 15 a of the first cap 15.
- the guide groove 18 may be formed on the inner wall 15 a of the first cap 15, and the guide convex portion 19 may be provided on the outer periphery of the rotation preventing member 14.
- the guide groove 18 is formed in the inner wall 15 a of the first cap 15, the guide groove 18 is provided in advance when the first cap 15 is manufactured, and the outer periphery of the rotation preventing member 14 is a surface facing the guide groove 18. Make a hole in. Then, a guide member 19 is formed by press-fitting a pin member into the hole. In this configuration, since it is not necessary to form the pin hole 21 in the inner wall 15a of the first cap 15 and press-fit the pin member, it is possible to reduce work processes such as forming the hole insertion hole 20 in the first cap 15. . Further, since the outer periphery of the rotation preventing member 14 may be processed, if the rotation preventing member 14 is taken out from the first cap 15, the drilling operation of the guide convex portion 19 can be simplified.
- the rotation prevention member 14 of the spool 3 is provided at one end of the spool 3.
- the rotation prevention member is provided at the other end, and the rotation prevention member is provided at both ends of the spool 3. Also good.
- the rotation preventing member 14 is connected to at least one end of the spool 3 provided in the valve housing 1.
- a guide groove 18 extending in the axial direction of the spool 3 is provided on either the inner wall 15 a of the first cap 15 or the outer periphery of the rotation preventing member 14.
- a guide convex portion 19 that is relatively movable along the guide groove 18 is provided on either the inner wall 15 a of the first cap 15 or the outer periphery of the rotation preventing member 14.
- the spool 3 can be rotated without groove processing on the spool 3 itself.
- the center of gravity of the spool 3 is not shifted from the center of rotation of the spool 3.
- the guide groove 18 is not formed in the spool 3, it does not interfere with the flow path formed in the valve housing 1, and the valve housing 1 can be prevented from being enlarged.
- the rotation preventing member 14 is connected to the end of the spool 3, and the spool 3 is attached in the first cap 15 between the end of the spool 3 and the rotation preventing member 14.
- a first spring 13 is provided.
- the rotation preventing member 14 since the rotation preventing member 14 also has a spool end function, it can function in the same manner as the conventional spool end 104. That is, the rotation prevention function can be added while preventing the spool valve 100 from becoming large without increasing the number of new members.
- the guide groove 18 has a length more than twice the length necessary for a full stroke in one direction of the spool 3.
- the guide groove 18 since the guide groove 18 is formed on the inner wall 15a of the first cap 15 or the outer periphery of the rotation preventing member 14, the guide groove 18 does not interfere with the flow path formed in the valve housing 1, and thus the full stroke is achieved. It is possible to form a groove having a necessary length.
- the guide groove 18 is formed in the rotation preventing member 14.
- the guide protrusion 19 is provided on the inner wall 15 a of the first cap 15.
- the guide protrusion 19 is a pin member, and the first cap 15 has a pin hole 21 into which the pin member is inserted into the inner wall 15 a of the first cap 15. Further, a hole insertion tool insertion hole 20 for forming the pin hole 21 is formed at a position facing the pin hole 21.
- the pinhole 21 can be easily formed from the drilling tool insertion hole 20. It can. That is, even if the first cap 15 is an off-the-shelf product, the pin hole 21 can be formed in the inner wall 15a of the first cap 15 that faces the guide groove 18 as long as the drilling tool insertion hole 20 can be formed.
- the first pilot chamber 17 is formed in the first cap 15, and the drilling tool insertion hole 20 also functions as a pilot port that guides the pilot pressure to the first pilot chamber 17.
- the drilling tool insertion hole 20 also serves as a pilot port, it is not necessary to close the drilling tool insertion hole 20 after the pin hole 21 is formed.
- the hole punching tool insertion hole 20 can be used as it is as a pilot port.
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
A spool valve (100) comprises a spool (3) that is slidably provided in a spool hole (2) formed in a valve housing (1), a first cap (15) that covers the spool hole (2), and an anti-rotation member (14) that is connected to at least one end of the spool (3). The spool valve (100) comprises: a guide groove (18) that is formed either on an inside wall (15a) of the first cap (15) or the outer periphery of the anti-rotation member (14), and extends in the axial direction of the spool (3); and a guide protrusion (19) that is provided to the other of the inside wall (15a) of the first cap (15) or the anti-rotation member (14), and can move in a relative manner along the guide groove (18).
Description
この発明は、スプール弁に関する。
This invention relates to a spool valve.
従来のスプール弁として、JP2003-097739Aに開示されるものがある。JP2003-097739Aに開示されるスプール弁では、バルブハウジングにスプール孔が形成され、スプール孔に、図示していないアクチュエータの作動流体を制御するスプールが摺動自在に組み込まれる。スプールの一方の端部には、バルブハウジングから突出するように設けられるスプールエンドが組み付けられる。スプールエンドは、スペーサを介してバルブハウジングに取り付けられるキャップに収容される。
A conventional spool valve is disclosed in JP2003-09739A. In the spool valve disclosed in JP2003-09739A, a spool hole is formed in the valve housing, and a spool for controlling a working fluid of an actuator (not shown) is slidably incorporated in the spool hole. A spool end provided so as to protrude from the valve housing is assembled to one end portion of the spool. The spool end is accommodated in a cap attached to the valve housing via a spacer.
このようなスプール弁では、作動流体によってスプールが周方向に回転する可能性がある。JP2003-097739Aに開示されるスプール弁では、軸方向に沿ってスプールにガイド溝が設けられ、スペーサの内面には、回止部材がガイド溝に対向して設けられる。回止部材は、ガイド溝に挿入され、スプールの軸方向の動きを許容するとともに、ガイド溝と接触することでスプールの周方向の回転を防止する。このように、JP2003-097739Aに開示されるスプール弁では、回止部材とガイド溝により、スプールの周方向の回転が防止される。
In such a spool valve, there is a possibility that the spool rotates in the circumferential direction due to the working fluid. In the spool valve disclosed in JP2003-09739A, a guide groove is provided in the spool along the axial direction, and a rotation stop member is provided on the inner surface of the spacer so as to face the guide groove. The rotation-preventing member is inserted into the guide groove, allows the spool to move in the axial direction, and prevents rotation of the spool in the circumferential direction by contacting the guide groove. As described above, in the spool valve disclosed in JP2003-09739A, the rotation of the spool in the circumferential direction is prevented by the rotation stop member and the guide groove.
JP2003-097739Aに開示されるスプール弁では、スプールの外周の一箇所だけにガイド溝が形成されているので、スプールを回転させたときの回転中心とスプールの重心とがずれてしまう。そのため、例えばスプールを高速回転させながら研磨するときに、スプールがたわんでしまい、スプールの真円度がでにくくなってしまう。スプールの真円が保たれないと、スプール孔とスプールとの間で流体の漏れが生じるおそれがある。また、スプールの真円度が保たれないと、スプール孔内での軸方向へのスプールの移動が妨げられるスティックの原因にもなる。
In the spool valve disclosed in JP2003-09739A, since the guide groove is formed only at one position on the outer periphery of the spool, the rotation center when the spool is rotated and the center of gravity of the spool are shifted. Therefore, for example, when polishing while rotating the spool at a high speed, the spool is bent, and the roundness of the spool is difficult to be achieved. If the perfect circle of the spool is not maintained, fluid may leak between the spool hole and the spool. Further, if the roundness of the spool is not maintained, it may cause a stick that prevents the spool from moving in the axial direction in the spool hole.
また、スプールに形成されたガイド溝は、スプールのストロークに対応する所定の軸方向長さを備えている。そのため、スプールをストロークさせたときに、ガイド溝がバルブハウジングに形成された油路と干渉(連通)するおそれがある。このような場合には、スプール弁による適切な制御ができなくなるおそれがある。ガイド溝とバルブハウジングに形成された油路との干渉を回避するには、スプールのストロークの長さに対応させて、バルブハウジングを大きくするか、あるいは、スペーサなどの別部材を設けることが考えられる。しかしながら、この場合には、スプール弁が大型化してしまう。
Further, the guide groove formed in the spool has a predetermined axial length corresponding to the stroke of the spool. Therefore, when the spool is stroked, the guide groove may interfere with (communicate with) the oil passage formed in the valve housing. In such a case, there is a possibility that appropriate control by the spool valve cannot be performed. In order to avoid interference between the guide groove and the oil passage formed in the valve housing, it is considered that the valve housing is enlarged or another member such as a spacer is provided corresponding to the length of the spool stroke. It is done. However, in this case, the spool valve becomes large.
この発明の目的は、スプールの重心を変えることなく、スプール弁の大型化を防止して、スプールの周方向の回転を防止したスプール弁を提供することである。
An object of the present invention is to provide a spool valve which prevents the spool valve from rotating in the circumferential direction by preventing the spool valve from becoming large without changing the center of gravity of the spool.
本発明のある態様によれば、バルブハウジングに設けられたスプールの少なくとも一端に回転防止部材が連結される。そして、キャップの内壁または回転防止部材の外周のいずれか一方には、スプールの軸方向に伸びるガイド溝が設けられる。また、キャップの内壁または回転防止部材の外周のいずれか他方には、ガイド溝に沿って相対移動可能にしたガイド凸部が設けられる。
According to an aspect of the present invention, the rotation preventing member is coupled to at least one end of the spool provided in the valve housing. A guide groove extending in the axial direction of the spool is provided on either the inner wall of the cap or the outer periphery of the rotation preventing member. In addition, a guide convex portion that is relatively movable along the guide groove is provided on either the inner wall of the cap or the outer periphery of the rotation preventing member.
以下、添付図面を参照して、本発明の実施形態に係るスプール弁100について説明する。スプール弁100は、例えば、油圧シリンダなどのアクチュエータ(図示省略)に対する作動油等の作動流体の給排を切り換え、アクチュエータの動作を制御するものである。
Hereinafter, a spool valve 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings. The spool valve 100 switches the supply and discharge of working fluid such as hydraulic fluid to an actuator (not shown) such as a hydraulic cylinder, for example, and controls the operation of the actuator.
図1~図3は、本発明の実施形態に係るスプール弁100を示すものである。図1に示すように、スプール弁100は、スプール孔2が形成されるバルブハウジング1と、スプール孔2に摺動自在に組み込まれるスプール3と、スプール3を軸方向に付勢する第1及び第2付勢部10,30と、を備える。スプール孔2は、バルブハウジング1の両側面1a,1bに開口する貫通孔である。
1 to 3 show a spool valve 100 according to an embodiment of the present invention. As shown in FIG. 1, the spool valve 100 includes a valve housing 1 in which a spool hole 2 is formed, a spool 3 that is slidably incorporated in the spool hole 2, and a first and a second that urge the spool 3 in the axial direction. Second urging units 10 and 30. The spool hole 2 is a through hole that opens on both side surfaces 1 a and 1 b of the valve housing 1.
バルブハウジング1には、作動流体が通過する複数の流路が形成される。具体的には、バルブハウジング1には、アクチュエータに給排される作動流体を導く第1、第2給排通路4a,4bと、ポンプ(図示省略)に連通するポンプ通路5と、タンク(図示省略)に連通するタンク通路6a,6bと、ポンプ通路5に連通するブリッジ通路7と、が形成される。第1及び第2給排通路4a,4b、タンク通路6a,6b、及びブリッジ通路7は、それぞれスプール孔2に連通する。スプール弁100は、スプール3のポジションに応じて、第1、第2給排通路4a,4bとブリッジ通路7及びタンク通路6a,6bとの連通状態を切り換え、アクチュエータに対する作動流体の給排を制御する。
A plurality of flow paths through which the working fluid passes are formed in the valve housing 1. Specifically, the valve housing 1 includes first and second supply / discharge passages 4a and 4b for guiding a working fluid supplied to and discharged from the actuator, a pump passage 5 communicating with a pump (not shown), and a tank (not shown). Tank passages 6 a and 6 b communicating with (omitted) and a bridge passage 7 communicating with the pump passage 5 are formed. The first and second supply / discharge passages 4a and 4b, the tank passages 6a and 6b, and the bridge passage 7 communicate with the spool hole 2, respectively. The spool valve 100 switches the communication state between the first and second supply / discharge passages 4a and 4b, the bridge passage 7 and the tank passages 6a and 6b according to the position of the spool 3, and controls the supply and discharge of the working fluid to the actuator. To do.
第1付勢部10は、バルブハウジング1に取り付けられる第1キャップ15と、スプール3の一端部3aに連結され第1キャップ15に収容される回転防止部材14と、スプール3の一端部3aと回転防止部材14との間に設けられるスプリングとしての第1スプリング13と、を備える。回転防止部材14は、スプール3が後述する中立位置にあるときに、バルブハウジング1の一方の側面1aから突出して設けられる。第1キャップ15は、バルブハウジング1とは別部材であって、回転防止部材14が突出するバルブハウジング1の側面1aにボルト16によって固定される。スプール孔2における側面1aの開口と回転防止部材14とは、第1キャップ15によって覆われる。
The first urging portion 10 includes a first cap 15 attached to the valve housing 1, an anti-rotation member 14 connected to the one end 3 a of the spool 3 and accommodated in the first cap 15, and one end 3 a of the spool 3. And a first spring 13 as a spring provided between the rotation preventing member 14. The rotation preventing member 14 is provided so as to protrude from one side surface 1a of the valve housing 1 when the spool 3 is in a neutral position described later. The first cap 15 is a separate member from the valve housing 1, and is fixed to the side surface 1 a of the valve housing 1 from which the rotation preventing member 14 protrudes by bolts 16. The opening of the side surface 1 a in the spool hole 2 and the rotation preventing member 14 are covered with a first cap 15.
図2に示すように、回転防止部材14には、スプール3とは反対側にエンド部14aが設けられる。エンド部14aが第1キャップ15の内壁15aに当接することで、スプール3の一方(図1中右方向)へのストロークが規制される。つまり、エンド部14aは、第1キャップ15の内壁15aに当接することで、スプール3における一方のストローク端を規定する。
As shown in FIG. 2, the rotation preventing member 14 is provided with an end portion 14 a on the opposite side to the spool 3. When the end portion 14a contacts the inner wall 15a of the first cap 15, the stroke of the spool 3 in one direction (right direction in FIG. 1) is restricted. That is, the end portion 14 a abuts the inner wall 15 a of the first cap 15, thereby defining one stroke end of the spool 3.
第1スプリング13は、スプール3の端部3aと回転防止部材14のエンド部14aとの間にスプリングシート12を介して設けられる。第1スプリング13は、両端をスプール3の端部3aと回転防止部材14のエンド部14aとにそれぞれ圧接させ、スプール3を中立位置で保つように付勢する。
The first spring 13 is provided between the end 3 a of the spool 3 and the end 14 a of the rotation preventing member 14 via the spring seat 12. The first spring 13 presses both ends against the end portion 3a of the spool 3 and the end portion 14a of the rotation preventing member 14, respectively, and biases the spool 3 so as to keep it in the neutral position.
第1キャップ15の内壁15aの下端側には、パイロット通路(図示省略)と連通するパイロットポートが形成されている。本実施形態では、パイロットポートは、後述するガイド凸部19を取り付けるための穴開け具挿入孔20としての役割を担っている。第1キャップ15内には、第1パイロット室17が形成される。第1パイロット室17にパイロット圧が導かれることにより、図1中左方向にスプール3がストロークする。また、本実施形態では、図2に示すように、第1パイロット室17に導かれたパイロット圧は、回転防止部材14の軸芯に設けられた連通孔14bを介して、第1スプリング13が設けられたスプリング室にも導かれる。
A pilot port communicating with a pilot passage (not shown) is formed on the lower end side of the inner wall 15a of the first cap 15. In the present embodiment, the pilot port plays a role as a drilling tool insertion hole 20 for attaching a guide projection 19 described later. A first pilot chamber 17 is formed in the first cap 15. When the pilot pressure is guided to the first pilot chamber 17, the spool 3 strokes in the left direction in FIG. Further, in the present embodiment, as shown in FIG. 2, the pilot pressure guided to the first pilot chamber 17 is generated by the first spring 13 via the communication hole 14 b provided in the shaft core of the rotation preventing member 14. It is also guided to the provided spring chamber.
図1に示すように、スプール3の他端側(第1付勢部10とは反対側)に設けられる第2付勢部30は、スプール3の他端部3bに取り付けられるスプールエンド24と、スプールエンド24を収容しバルブハウジング1の他方の側面1bに取り付けられる第2キャップ25と、スプール3の他端部3bとスプールエンド24との間に設けられる第2スプリング23と、を備える。
As shown in FIG. 1, the second urging portion 30 provided on the other end side of the spool 3 (the side opposite to the first urging portion 10) includes a spool end 24 attached to the other end portion 3 b of the spool 3. A second cap 25 that accommodates the spool end 24 and is attached to the other side surface 1 b of the valve housing 1, and a second spring 23 provided between the other end 3 b of the spool 3 and the spool end 24.
スプールエンド24は、バルブハウジング1から突出するように設けられる。スプールエンド24は、第2キャップ25の内壁25aに当接することにより、他方(図1中左方向)へのスプール3のストロークを規制する。つまり、スプールエンド24は、第2キャップ25の内壁25aに当接することにより、スプール3における他方のストローク端を規定する。
The spool end 24 is provided so as to protrude from the valve housing 1. The spool end 24 abuts against the inner wall 25a of the second cap 25, thereby restricting the stroke of the spool 3 in the other direction (left direction in FIG. 1). In other words, the spool end 24 defines the other stroke end of the spool 3 by contacting the inner wall 25a of the second cap 25.
第2キャップ25は、スプールエンド24及びスプール孔2の他方の開口を覆うとともに、バルブハウジング1におけるスプールエンド24が突出する側面(他方の側面)に固定される。第2キャップ25内には、第2パイロット室26が形成され、パイロット通路から第2パイロット室26へパイロット圧が導かれることにより、スプール3が図1中右方向にストロークする。
The second cap 25 covers the other end of the spool end 24 and the spool hole 2 and is fixed to a side surface (the other side surface) of the valve housing 1 from which the spool end 24 protrudes. A second pilot chamber 26 is formed in the second cap 25, and pilot pressure is guided from the pilot passage to the second pilot chamber 26, whereby the spool 3 strokes in the right direction in FIG. 1.
スプール弁100では、第1及び第2付勢部10,30における第1及び第2スプリング13,23の付勢力により、スプール3が中立位置に保持される。中立位置では、第1及び第2給排通路4a,4bとブリッジ通路7及びタンク通路6a,6bとの連通がそれぞれ遮断され、アクチュエータへの作動流体の給排が遮断される。第1及び第2付勢部10,30の第1及び第2パイロット室17,26のいずれかにパイロット圧が導かれると、そのパイロット圧に応じてスプール3が移動して、ポジションが切り換えられる。パイロット圧を導くパイロット室を切り換えることにより、スプール3のポジションも切り換えられる。スプール弁100は、そのポジションに応じて、アクチュエータに給排される作動流体を切り換えて、アクチュエータの作動を制御する。つまり、中立位置とは、第1及び第2パイロット室17,26のいずれにもパイロット圧が導かれず、第1及び第2スプリング13,23の付勢力によってスプール3が保持された状態の位置である。
In the spool valve 100, the spool 3 is held in the neutral position by the urging force of the first and second springs 13 and 23 in the first and second urging units 10 and 30. In the neutral position, the communication between the first and second supply / discharge passages 4a and 4b, the bridge passage 7 and the tank passages 6a and 6b is blocked, and the supply and discharge of the working fluid to the actuator is blocked. When the pilot pressure is introduced to one of the first and second pilot chambers 17 and 26 of the first and second urging units 10 and 30, the spool 3 moves according to the pilot pressure and the position is switched. . By switching the pilot chamber for introducing the pilot pressure, the position of the spool 3 is also switched. The spool valve 100 controls the operation of the actuator by switching the working fluid supplied to and discharged from the actuator according to the position. That is, the neutral position is a position in which the pilot pressure is not guided to any of the first and second pilot chambers 17 and 26 and the spool 3 is held by the urging force of the first and second springs 13 and 23. is there.
次に、スプール3の回り止め構造について詳細に説明する。
Next, the anti-rotation structure of the spool 3 will be described in detail.
スプール弁100は、図2に示すように、回転防止部材14のエンド部14aに形成され、スプール3の軸方向に沿って延びる一本のガイド溝18と、ガイド溝18に対向する位置であって、第1キャップ15の内壁15aに設けられるピン部材からなるガイド凸部19と、をさらに備える。ガイド溝18の長さは、スプール3を一方の方向にフルストロークさせるために必要な長さの2倍の長さ以上を備えている。つまり、ガイド溝18の長さは、スプール3が中立位置から一方のストローク端まで移動するストローク長さの2倍以上である。
As shown in FIG. 2, the spool valve 100 is formed at the end portion 14 a of the rotation preventing member 14, and has a single guide groove 18 extending along the axial direction of the spool 3 and a position facing the guide groove 18. And a guide protrusion 19 made of a pin member provided on the inner wall 15a of the first cap 15. The length of the guide groove 18 is at least twice as long as the length required for the spool 3 to make a full stroke in one direction. That is, the length of the guide groove 18 is at least twice the stroke length of the spool 3 moving from the neutral position to one stroke end.
また、ガイド溝18は、スプール3の位置に関わらず、バルブハウジング1に形成される流路とは連通しないように回転防止部材14のエンド部14aに形成される。つまり、第1パイロット室17のパイロット圧によってスプール3が他方のストローク端まで移動した状態であっても、ガイド溝18は流路(例えば、本実施形態におけるタンク通路6a)と連通しないように構成される。
The guide groove 18 is formed in the end portion 14 a of the rotation preventing member 14 so as not to communicate with the flow path formed in the valve housing 1 regardless of the position of the spool 3. That is, the guide groove 18 is configured not to communicate with the flow path (for example, the tank passage 6a in the present embodiment) even when the spool 3 is moved to the other stroke end by the pilot pressure in the first pilot chamber 17. Is done.
ガイド凸部19は、ガイド溝18にはまりあうように挿入される。ガイド凸部19は、スプール3の動きにともなって、ガイド溝18と軸方向に相対移動可能に構成される。また、ガイド凸部19は、スプール3が中立位置にあるときに、ガイド溝18の軸方向長さの中間に位置するように設けられている。このように、スプール弁100では、ガイド溝18がフルストロークの長さの2倍以上に形成されると共に、スプール3が中立位置にあるときにガイド凸部19がガイド溝18の軸方向の中間に位置する。これにより、スプール3の移動に伴うガイド溝18とガイド凸部19との軸方向の接触や、ガイド凸部19がガイド溝18に対向しない位置までスプール3が移動してガイド溝18からガイド凸部19が脱落することが防止される。よって、ガイド溝18及びガイド凸部19によりスプール3のストロークが阻害されることを防止できる。
The guide convex portion 19 is inserted so as to fit into the guide groove 18. The guide protrusion 19 is configured to be movable relative to the guide groove 18 in the axial direction along with the movement of the spool 3. Further, the guide convex portion 19 is provided so as to be located in the middle of the axial length of the guide groove 18 when the spool 3 is in the neutral position. Thus, in the spool valve 100, the guide groove 18 is formed to be twice or more of the full stroke length, and the guide protrusion 19 is positioned in the axial direction of the guide groove 18 when the spool 3 is in the neutral position. Located in. Thus, the axial contact between the guide groove 18 and the guide convex portion 19 accompanying the movement of the spool 3, or the spool 3 moves to a position where the guide convex portion 19 does not oppose the guide groove 18, and the guide convex portion 18 moves away from the guide groove 18. The part 19 is prevented from falling off. Therefore, the stroke of the spool 3 can be prevented from being obstructed by the guide groove 18 and the guide convex portion 19.
また、ガイド凸部19は、ガイド溝18に対して、スプール3の周方向に係止される。ガイド凸部19は、スプール3のストロークの動きに伴って、スプール3の軸方向の動きを許容するとともに、ガイド溝18と周方向に接触して、スプール3の周方向の回転を阻止するように作用する。
Further, the guide projection 19 is locked in the circumferential direction of the spool 3 with respect to the guide groove 18. The guide protrusion 19 allows the spool 3 to move in the axial direction as the spool 3 moves, and contacts the guide groove 18 in the circumferential direction to prevent the spool 3 from rotating in the circumferential direction. Act on.
次に、スプール弁100の組み立て方法について説明する。
Next, a method for assembling the spool valve 100 will be described.
第1キャップ15に設けられるガイド凸部19は、穴開け具挿入孔20の孔を利用して第1キャップ15の内壁15aに取り付けられる。穴開け具挿入孔20は、ガイド凸部19と対向する位置に形成される。言い換えれば、穴開け具挿入孔20は、ガイド凸部19に対して、スプール3の回転中心を基準とした周方向位置が180°だけ離間すると共にスプール3の軸方向位置は略同一となるような位置に形成される。そして、第1キャップ15の内壁15aを貫通させた穴開け具挿入孔20の開口からドリル(図示省略)を挿入し、第1キャップ15の内壁15aにガイド凸部19となるピン部材を圧入するピン穴21を形成する。ピン穴21にピン部材を圧入し、ガイド凸部19が第1キャップ15の内壁15aに設けられる。
The guide protrusion 19 provided on the first cap 15 is attached to the inner wall 15a of the first cap 15 using the hole of the hole insertion tool insertion hole 20. The punching tool insertion hole 20 is formed at a position facing the guide convex portion 19. In other words, the hole insertion tool insertion hole 20 is spaced apart from the guide projection 19 by 180 ° in the circumferential direction with respect to the rotation center of the spool 3, and the axial position of the spool 3 is substantially the same. Formed at various positions. Then, a drill (not shown) is inserted from the opening of the drilling tool insertion hole 20 that penetrates the inner wall 15 a of the first cap 15, and a pin member that becomes the guide convex portion 19 is press-fitted into the inner wall 15 a of the first cap 15. A pin hole 21 is formed. A pin member is press-fitted into the pin hole 21, and the guide convex portion 19 is provided on the inner wall 15 a of the first cap 15.
なお、本実施形態では、穴開け具挿入孔20は、パイロットポートを兼ねてガイド凸部19と対向した位置に設けられているが、パイロット圧を導くパイロットポートは、第1キャップ15の側面端等の他の位置に設けられてもよい。このような場合には、ピン穴21を形成する箇所に対向する位置で作業用の穴開け具挿入孔20を形成し、穴開け具挿入孔20から第1キャップ15の内壁15aにピン穴21を設ければよい。そして、ピン穴21にガイド凸部19を圧入したあと、プラグ等により穴開け具挿入孔20を塞げばよい。
In this embodiment, the hole insertion tool insertion hole 20 serves as a pilot port and is provided at a position facing the guide convex portion 19, but the pilot port for guiding the pilot pressure is provided at the side end of the first cap 15. It may be provided at other positions. In such a case, a working hole insertion hole 20 is formed at a position opposite to the location where the pin hole 21 is formed, and the pin hole 21 is formed from the hole insertion hole 20 to the inner wall 15 a of the first cap 15. May be provided. Then, after the guide convex portion 19 is press-fitted into the pin hole 21, the drilling tool insertion hole 20 may be closed with a plug or the like.
このように、第1キャップ15のピン穴21に対向する位置で、穴開け具挿入孔20が形成されているので、穴開け具挿入孔20を通じて簡単にピン穴21を形成することができる。つまり、既製品のキャップであっても、穴開け具挿入孔20が形成できれば、ガイド溝18と対向する第1キャップ15の内壁15aにピン穴21を形成することができる。
As described above, since the punching tool insertion hole 20 is formed at a position facing the pin hole 21 of the first cap 15, the pinhole 21 can be easily formed through the punching tool insertion hole 20. That is, even if it is a ready-made cap, the pin hole 21 can be formed in the inner wall 15a of the 1st cap 15 which opposes the guide groove 18 if the drilling tool insertion hole 20 can be formed.
また、本実施形態では、穴開け具挿入孔20が、パイロットポートとしても機能するので、ピン穴21を形成したあと、あらためて穴開け具挿入孔20を塞ぐ必要がない。このように、穴開け具挿入孔20をパイロットポートとして、そのまま利用することができる。
Further, in this embodiment, since the punching tool insertion hole 20 also functions as a pilot port, it is not necessary to block the punching tool insertion hole 20 again after the pin hole 21 is formed. Thus, the hole punching tool insertion hole 20 can be used as it is as a pilot port.
次に、あらかじめエンド部14aに形成されるガイド溝18にガイド凸部19をはめあわせるようにして、回転防止部材14を覆うように第1キャップ15を取り付ける。スプール3は、もともとスプール孔2内にて周方向に回転できるように設けられている。よって、ガイド溝18にガイド凸部19をはめあわせた状態のまま、ボルト16によりバルブハウジング1と第1キャップ15とを固定する固定位置となるように、第1キャップ15と回転防止部材14とを回転させる。そして、ボルト16により第1キャップ15をバルブハウジング1に固定する。
Next, the first cap 15 is attached so as to cover the rotation preventing member 14 by fitting the guide convex portion 19 into the guide groove 18 formed in the end portion 14a in advance. The spool 3 is originally provided so as to be able to rotate in the circumferential direction within the spool hole 2. Therefore, the first cap 15 and the anti-rotation member 14 are in a fixed position in which the valve housing 1 and the first cap 15 are fixed by the bolt 16 with the guide convex portion 19 fitted in the guide groove 18. Rotate. Then, the first cap 15 is fixed to the valve housing 1 with the bolt 16.
なお、本実施形態では、ガイド溝18の形状は、図3に示したように断面凹形状になっているが、断面半円形状、あるいはガイド凸部19の突出部の形状に合わせた形状にしてもより。ガイド凸部19が、ガイド溝18にはめられ、スプール3のストロークの動きにともなって、スプール3の軸方向の動きを許容するとともに、スプール3の周方向の回転を防止できれば、ガイド溝18はどのような形状であってもよい。また、ガイド凸部19はピン部材を用いたが、あらかじめ第1キャップ15に突起を設けてガイド凸部19としてもかまわない。
In the present embodiment, the shape of the guide groove 18 is a concave cross section as shown in FIG. 3, but it is a semicircular cross section or a shape that matches the shape of the protruding portion of the guide convex portion 19. Even more. If the guide convex portion 19 is fitted in the guide groove 18 to allow the spool 3 to move in the axial direction and prevent the spool 3 from rotating in the circumferential direction as the stroke of the spool 3 moves, the guide groove 18 Any shape is acceptable. In addition, although the guide convex portion 19 uses a pin member, the first cap 15 may be provided with a protrusion in advance to form the guide convex portion 19.
ここで、本実施形態の理解を容易にするために、図4を参照して、本実施形態の比較例に係るスプール弁200について説明する。なお、比較例に係るスプール弁200は、本発明の技術的範囲に含まれるものではない。
Here, in order to facilitate understanding of the present embodiment, a spool valve 200 according to a comparative example of the present embodiment will be described with reference to FIG. The spool valve 200 according to the comparative example is not included in the technical scope of the present invention.
比較例に係るスプール弁200では、図4に示すように、バルブハウジング101にスプール孔102が形成されるとともに、スプール孔102にはスプール103が摺動自在に組み込まれる。スプール103の一方の端部には、スプールエンド104が組み付けられる。
In the spool valve 200 according to the comparative example, as shown in FIG. 4, a spool hole 102 is formed in the valve housing 101, and a spool 103 is slidably incorporated in the spool hole 102. A spool end 104 is assembled to one end of the spool 103.
スプールエンド104には、スプリングシート105,105を介してスプリング106が設けられる。スプリング106は、スプール103の端部とスプールエンド104の端部に設けられたボルト104aとの間にスプリングシート105を介して設けられる。スプリング106は、スプリング106の両端をスプール103の端部とボルト104aとに圧接させ、スプール103を中立位置に保っている。このようなスプールエンド104が突出して設けられた側のバルブハウジング101の側面には、円板状のスペーサ107を介して、キャップ108が取り付けられる。キャップ108によって、スプール103に組み付けられたスプールエンド104が覆われる。
The spool end 104 is provided with a spring 106 via spring seats 105, 105. The spring 106 is provided via a spring seat 105 between the end of the spool 103 and the bolt 104 a provided at the end of the spool end 104. The spring 106 presses both ends of the spring 106 against the end of the spool 103 and the bolt 104a to keep the spool 103 in a neutral position. A cap 108 is attached to the side surface of the valve housing 101 on the side where the spool end 104 protrudes through a disc-like spacer 107. The cap 108 covers the spool end 104 assembled to the spool 103.
キャップ108の側端には、パイロット通路(図示省略)と連通するポート109が形成される。ポート109の内径はパイロット室110の内径よりも小さく形成される。図4に示すように、スプール103の少なくとも一方の端部側には、スプール103の軸方向に沿って、1つのガイド溝111が形成される。ガイド溝111は、スプール103が左右にフルストロークすることができる必要長さを備えている。
A port 109 communicating with a pilot passage (not shown) is formed at the side end of the cap 108. The inner diameter of the port 109 is smaller than the inner diameter of the pilot chamber 110. As shown in FIG. 4, one guide groove 111 is formed along the axial direction of the spool 103 on at least one end side of the spool 103. The guide groove 111 has a necessary length that allows the spool 103 to perform a full stroke to the left and right.
また、スペーサ107の内面には、球体の回止部材112がガイド溝111に対向して設けられる。回止部材112は、ガイド溝111にはめられ、スプール103のストロークの動きに伴って、スプール103の軸方向の動きを許容する。また、これとともに、回止部材112は、ガイド溝111と接触して、スプール103の周方向の回転を阻止するように作用する。このように、回止部材112は、ガイド溝111と相まってスプール103の周方向の回転が起きないように作用している。
Also, a spherical rotation member 112 is provided on the inner surface of the spacer 107 so as to face the guide groove 111. The stop member 112 is fitted into the guide groove 111 and allows the spool 103 to move in the axial direction as the stroke of the spool 103 moves. At the same time, the anti-rotation member 112 comes into contact with the guide groove 111 and acts to prevent the spool 103 from rotating in the circumferential direction. In this manner, the rotation stop member 112 acts together with the guide groove 111 so that the rotation of the spool 103 in the circumferential direction does not occur.
スプール弁200の特徴として、作動流体の流量が大きくなればなるほど、スプール103が周方向に回転する現象が生じやすくなる。特に、大型機械のスプール弁でこのような現象が起こりやすい。スプール103が周方向に回転すると、スプール孔102とスプール103との接触部が磨耗して、両者間に隙間が発生する。このように隙間ができると、作動流体の制御が適切にできなくなる。
As a feature of the spool valve 200, the larger the flow rate of the working fluid, the more easily the phenomenon that the spool 103 rotates in the circumferential direction. In particular, such a phenomenon is likely to occur in a spool valve of a large machine. When the spool 103 rotates in the circumferential direction, a contact portion between the spool hole 102 and the spool 103 is worn, and a gap is generated between them. If a gap is formed in this way, the working fluid cannot be controlled properly.
また、比較例に係るスプール弁200は、スプール103がフルストロークしたとき、スプールエンド104の側端に設けられたボルト104aが、キャップ108の内壁108aと接触せずに止まる構成になっている。しかし、スプール103がフルストロークしたときに、スプールエンド104の側端部が、キャップ108の内壁108aに当接してストロークの動作が止まる構造のものもある。この場合、スプールエンド104の側端部とキャップ108の内壁108aとが当接したまま周方向の回転現象が起こると、キャップ108の内壁108aが磨耗してしまう。このような磨耗は、スプールエンド104がキャップ108の部材よりも硬いことが原因になっている。このようにキャップ108の内壁108aが磨耗してしまうと、スプール103は正規のストローク位置が保たれなくなる。
Further, the spool valve 200 according to the comparative example is configured such that when the spool 103 has a full stroke, the bolt 104a provided on the side end of the spool end 104 stops without contacting the inner wall 108a of the cap 108. However, there is a structure in which when the spool 103 has a full stroke, the side end portion of the spool end 104 comes into contact with the inner wall 108a of the cap 108 and the stroke operation stops. In this case, if the circumferential rotation phenomenon occurs while the side end portion of the spool end 104 and the inner wall 108a of the cap 108 are in contact with each other, the inner wall 108a of the cap 108 is worn. Such wear is caused by the fact that the spool end 104 is harder than the member of the cap 108. If the inner wall 108a of the cap 108 is worn in this way, the spool 103 cannot maintain its normal stroke position.
比較例に係るスプール弁200では、スプール103の外周の一箇所だけにガイド溝111が形成されているので、スプール103を回転させたときの回転中心とスプール103の重心とがずれてしまう。そのため、例えばスプール103を高速回転させながら研磨するときに、スプール103がたわんでしまい、スプール103の真円度がでにくくなってしまう。スプール103の真円が保たれないと、スプール孔102とスプール103との間で流体の漏れが生じるおそれがある。また、スプール103の真円度が保たれないと、スプール孔102内でのスプール103の軸方向への移動が妨げられるスティックの原因にもなる。
In the spool valve 200 according to the comparative example, since the guide groove 111 is formed only at one place on the outer periphery of the spool 103, the rotation center when the spool 103 is rotated and the center of gravity of the spool 103 are shifted. Therefore, for example, when polishing while rotating the spool 103 at a high speed, the spool 103 is bent, and the roundness of the spool 103 is difficult to be obtained. If the true circle of the spool 103 is not maintained, fluid may leak between the spool hole 102 and the spool 103. Further, if the roundness of the spool 103 is not maintained, it may cause a stick that prevents the spool 103 from moving in the axial direction in the spool hole 102.
また、スプール103に形成されたガイド溝111は、スプール103のストロークに対応する所定の軸方向長さを備えている。そのため、スプール103をストロークさせたときに、ガイド溝111がバルブハウジング101に形成された油路と干渉(連通)するおそれがある。このような場合には、適切な制御ができなくなるおそれがある。ガイド溝111とバルブハウジング101に形成された油路との干渉を回避するには、スプール103のストロークの長さに対応させて、バルブハウジング101を大きくするか、あるいは、スペーサなどの別部材を設けることが考えられる。しかしながら、この場合には、スプール弁200が大型化してしまう。
Further, the guide groove 111 formed in the spool 103 has a predetermined axial length corresponding to the stroke of the spool 103. Therefore, when the spool 103 is stroked, the guide groove 111 may interfere with (communicate with) the oil passage formed in the valve housing 101. In such a case, there is a possibility that appropriate control cannot be performed. In order to avoid interference between the guide groove 111 and the oil passage formed in the valve housing 101, the valve housing 101 is enlarged according to the stroke length of the spool 103, or another member such as a spacer is used. It is conceivable to provide it. However, in this case, the spool valve 200 becomes large.
これに対し、本実施形態によれば、スプール3と軸方向に並ぶ回転防止部材14の外周にガイド溝18が形成されるので、スプール3自体に溝加工しなくてもスプール3の周方向の回転を防止することができる。このようにスプール3の外周に直接ガイド溝18を加工する必要がないので、スプール3の重心がスプール3の回転中心からずれてしまうことがない。そのため、スプール3を高速回転させながら外周を研磨するときに、スプール3がたわんでしまうことがなく、スプール3の真円度が保たれる。したがって、スプール孔2とスプール3との間で流体が漏れたり、スプール3がスティックしたりしない。
On the other hand, according to the present embodiment, the guide groove 18 is formed on the outer periphery of the rotation preventing member 14 aligned with the spool 3 in the axial direction, so that the circumferential direction of the spool 3 can be achieved without groove processing on the spool 3 itself. Rotation can be prevented. Thus, since it is not necessary to directly process the guide groove 18 on the outer periphery of the spool 3, the center of gravity of the spool 3 does not deviate from the rotation center of the spool 3. Therefore, when the outer periphery is polished while rotating the spool 3 at a high speed, the spool 3 is not bent and the roundness of the spool 3 is maintained. Therefore, fluid does not leak between the spool hole 2 and the spool 3 or the spool 3 does not stick.
また、回転防止部材14の外周にガイド溝18が形成されるので、スプール3が大きくストロークしたとしてもバルブハウジング1に形成された油路と干渉しあうことがない。このように、ガイド溝18がバルブハウジング1に形成された油路と干渉することを防止しつつ、フルストロークに必要なガイド溝18の長さを確保することができる。これにより、流路の作動流体がガイド溝18を通じて漏れ出すことが防止され、スプール弁100による適切な制御を行うことができる。さらに、バルブハウジング1に形成された油路とガイド溝18とが離れた位置に設けられており互いに干渉することがないため、バルブハウジング1を大きくする必要がない。したがって、スプール弁100の大型化を防止できる。
Further, since the guide groove 18 is formed on the outer periphery of the rotation preventing member 14, even if the spool 3 makes a large stroke, it does not interfere with the oil passage formed in the valve housing 1. Thus, the length of the guide groove 18 necessary for the full stroke can be ensured while preventing the guide groove 18 from interfering with the oil passage formed in the valve housing 1. Thereby, the working fluid in the flow path is prevented from leaking through the guide groove 18, and appropriate control by the spool valve 100 can be performed. Furthermore, since the oil passage formed in the valve housing 1 and the guide groove 18 are provided at positions apart from each other and do not interfere with each other, it is not necessary to enlarge the valve housing 1. Therefore, an increase in the size of the spool valve 100 can be prevented.
また、回転防止部材14は、スプールエンドを兼ねており、パイロット圧などを導く構成を加えることができる。言い換えれば、比較例のスプールエンド104と同様に機能させながら、回転防止機能を付加することができる。そのため、比較例のスプールエンド104とほぼ同じ大きさを維持できるので、新たな部材を増やすことなくフルストロークに必要な長さの溝を形成でき、スプール弁100の大型化を防止できる。このようなスプール弁100は、作動流量が大きい大型機械に対して特に有用である。
Further, the rotation preventing member 14 also serves as a spool end, and a configuration for guiding a pilot pressure or the like can be added. In other words, a rotation prevention function can be added while functioning similarly to the spool end 104 of the comparative example. Therefore, since it can maintain substantially the same size as the spool end 104 of the comparative example, a groove having a length necessary for a full stroke can be formed without adding new members, and the spool valve 100 can be prevented from being enlarged. Such a spool valve 100 is particularly useful for a large machine having a large operating flow rate.
なお、本実施形態では、ガイド溝18を回転防止部材14に形成し、ガイド凸部19を第1キャップ15の内壁15aに形成している。これに対し、第1キャップ15の内壁15aにガイド溝18を形成し、回転防止部材14の外周にガイド凸部19を設けてもよい。
In this embodiment, the guide groove 18 is formed in the rotation preventing member 14, and the guide convex portion 19 is formed on the inner wall 15 a of the first cap 15. On the other hand, the guide groove 18 may be formed on the inner wall 15 a of the first cap 15, and the guide convex portion 19 may be provided on the outer periphery of the rotation preventing member 14.
第1キャップ15の内壁15aにガイド溝18を形成する場合には、第1キャップ15の製造の際にあらかじめガイド溝18を設けるとともに、ガイド溝18の対向面であって回転防止部材14の外周に穴をあける。そして、その穴にピン部材を圧入してガイド凸部19を形成する。この構成では、第1キャップ15の内壁15aにピン穴21を形成し、ピン部材を圧入させる必要がないため、第1キャップ15に穴開け具挿入孔20を形成するなどの作業工程を少なくできる。また、回転防止部材14の外周を加工すればよいので、回転防止部材14を第1キャップ15から取り出せば、ガイド凸部19の穴開け作業などが簡単にできる。
When the guide groove 18 is formed in the inner wall 15 a of the first cap 15, the guide groove 18 is provided in advance when the first cap 15 is manufactured, and the outer periphery of the rotation preventing member 14 is a surface facing the guide groove 18. Make a hole in. Then, a guide member 19 is formed by press-fitting a pin member into the hole. In this configuration, since it is not necessary to form the pin hole 21 in the inner wall 15a of the first cap 15 and press-fit the pin member, it is possible to reduce work processes such as forming the hole insertion hole 20 in the first cap 15. . Further, since the outer periphery of the rotation preventing member 14 may be processed, if the rotation preventing member 14 is taken out from the first cap 15, the drilling operation of the guide convex portion 19 can be simplified.
また、本実施形態では、スプール3の回転防止部材14は、スプール3の一端に設けているが、他端にも回転防止部材を設け、スプール3の両端側に回転防止部材が設けられる構成としてもよい。
In the present embodiment, the rotation prevention member 14 of the spool 3 is provided at one end of the spool 3. However, the rotation prevention member is provided at the other end, and the rotation prevention member is provided at both ends of the spool 3. Also good.
以下、本発明の実施形態の構成、作用、及び効果をまとめて説明する。
Hereinafter, the configuration, operation, and effect of the embodiment of the present invention will be described together.
スプール弁100では、バルブハウジング1に設けられたスプール3の少なくとも一端に回転防止部材14が連結される。第1キャップ15の内壁15aまたは回転防止部材14の外周のいずれか一方には、スプール3の軸方向に伸びるガイド溝18が設けられる。第1キャップ15の内壁15aまたは回転防止部材14の外周のいずれか他方には、ガイド溝18に沿って相対移動可能にしたガイド凸部19が設けられる。
In the spool valve 100, the rotation preventing member 14 is connected to at least one end of the spool 3 provided in the valve housing 1. A guide groove 18 extending in the axial direction of the spool 3 is provided on either the inner wall 15 a of the first cap 15 or the outer periphery of the rotation preventing member 14. A guide convex portion 19 that is relatively movable along the guide groove 18 is provided on either the inner wall 15 a of the first cap 15 or the outer periphery of the rotation preventing member 14.
この構成によれば、第1キャップ15の内壁15aまたは回転防止部材14の外周のいずれか一方にガイド溝18が形成されるので、スプール3自体に溝加工をしなくてもスプール3の回転を防止でき、スプール3の重心がスプール3の回転中心からずれてしまうことがない。また、スプール3にガイド溝18を形成しないので、バルブハウジング1に形成された流路と干渉することがなく、バルブハウジング1の大型化を防止できる。
According to this configuration, since the guide groove 18 is formed on either the inner wall 15a of the first cap 15 or the outer periphery of the rotation prevention member 14, the spool 3 can be rotated without groove processing on the spool 3 itself. The center of gravity of the spool 3 is not shifted from the center of rotation of the spool 3. Further, since the guide groove 18 is not formed in the spool 3, it does not interfere with the flow path formed in the valve housing 1, and the valve housing 1 can be prevented from being enlarged.
また、スプール弁100では、回転防止部材14がスプール3の端部に連結され、第1キャップ15内であって、スプール3の端部と回転防止部材14との間には、スプール3を付勢する第1スプリング13が設けられる。
Further, in the spool valve 100, the rotation preventing member 14 is connected to the end of the spool 3, and the spool 3 is attached in the first cap 15 between the end of the spool 3 and the rotation preventing member 14. A first spring 13 is provided.
この構成によれば、回転防止部材14がスプールエンドの機能を兼ね備えているため、従来のスプールエンド104と同様に機能させることができる。つまり、新たな部材を増やすことなく、スプール弁100の大型化を防止しながら、回転防止機能を付加することができる。
According to this configuration, since the rotation preventing member 14 also has a spool end function, it can function in the same manner as the conventional spool end 104. That is, the rotation prevention function can be added while preventing the spool valve 100 from becoming large without increasing the number of new members.
また、スプール弁100では、ガイド溝18が、スプール3の一方の方向にフルストロークするために必要な長さの2倍の長さ以上を備えている。
Further, in the spool valve 100, the guide groove 18 has a length more than twice the length necessary for a full stroke in one direction of the spool 3.
この構成によれば、第1キャップ15の内壁15aまたは回転防止部材14の外周にガイド溝18が形成されるため、ガイド溝18がバルブハウジング1に形成された流路と干渉することなくフルストロークに必要な長さの溝を形成することができる。
According to this configuration, since the guide groove 18 is formed on the inner wall 15a of the first cap 15 or the outer periphery of the rotation preventing member 14, the guide groove 18 does not interfere with the flow path formed in the valve housing 1, and thus the full stroke is achieved. It is possible to form a groove having a necessary length.
また、スプール弁100では、ガイド溝18が回転防止部材14に形成される。他方で、ガイド凸部19が第1キャップ15の内壁15aに設けられる。そして、ガイド凸部19はピン部材であるとともに、第1キャップ15は、第1キャップ15の内壁15aにピン部材を挿入するピン穴21を有している。さらに、ピン穴21に対向する位置には、ピン穴21を形成するための穴開け具挿入孔20が形成される。
In the spool valve 100, the guide groove 18 is formed in the rotation preventing member 14. On the other hand, the guide protrusion 19 is provided on the inner wall 15 a of the first cap 15. The guide protrusion 19 is a pin member, and the first cap 15 has a pin hole 21 into which the pin member is inserted into the inner wall 15 a of the first cap 15. Further, a hole insertion tool insertion hole 20 for forming the pin hole 21 is formed at a position facing the pin hole 21.
この構成によれば、第1キャップ15のピン穴21に対向する位置に、穴開け具挿入孔20が形成されているので、穴開け具挿入孔20から簡単にピン穴21を形成することができる。つまり、第1キャップ15が既製品であっても、穴開け具挿入孔20が形成できれば、ガイド溝18と対向する第1キャップ15の内壁15aにピン穴21を形成することができる。
According to this configuration, since the drilling tool insertion hole 20 is formed at a position facing the pin hole 21 of the first cap 15, the pinhole 21 can be easily formed from the drilling tool insertion hole 20. it can. That is, even if the first cap 15 is an off-the-shelf product, the pin hole 21 can be formed in the inner wall 15a of the first cap 15 that faces the guide groove 18 as long as the drilling tool insertion hole 20 can be formed.
また、スプール弁100では、第1キャップ15内に第1パイロット室17が形成されるとともに、穴開け具挿入孔20が、第1パイロット室17にパイロット圧を導くパイロットポートとしても機能する。
In the spool valve 100, the first pilot chamber 17 is formed in the first cap 15, and the drilling tool insertion hole 20 also functions as a pilot port that guides the pilot pressure to the first pilot chamber 17.
この構成によれば、穴開け具挿入孔20が、パイロットポートを兼ねているので、ピン穴21を形成したあと、穴開け具挿入孔20を塞ぐ必要がない。このように、穴開け具挿入孔20をパイロットポートとしてそのまま利用することができる。
According to this configuration, since the drilling tool insertion hole 20 also serves as a pilot port, it is not necessary to close the drilling tool insertion hole 20 after the pin hole 21 is formed. Thus, the hole punching tool insertion hole 20 can be used as it is as a pilot port.
以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。
The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.
本願は2016年6月8日に日本国特許庁に出願された特願2016-114232に基づく優先権を主張し、この出願の全ての内容は参照により本明細書に組み込まれる。
This application claims priority based on Japanese Patent Application No. 2016-114232 filed with the Japan Patent Office on June 8, 2016, the entire contents of which are incorporated herein by reference.
Claims (5)
- スプール弁であって、
バルブハウジングと、
前記バルブハウジングに形成されるスプール孔に摺動自在に設けられるスプールと、
前記バルブハウジングに取り付けられるキャップと、
前記スプールの一端に連結され前記キャップに収容される回転防止部材と、
前記キャップの内壁または前記回転防止部材の外周のいずれか一方に形成され、前記スプールの軸方向に伸びるガイド溝と、
前記キャップの内壁または前記回転防止部材の外周のいずれか他方に設けられ、前記ガイド溝に沿って相対移動可能に前記ガイド溝に挿入されるガイド凸部と、を備えるスプール弁。 A spool valve,
A valve housing;
A spool slidably provided in a spool hole formed in the valve housing;
A cap attached to the valve housing;
An anti-rotation member connected to one end of the spool and housed in the cap;
A guide groove formed on either the inner wall of the cap or the outer periphery of the anti-rotation member and extending in the axial direction of the spool;
A spool valve comprising: a guide convex portion provided on either the inner wall of the cap or the outer periphery of the rotation preventing member and inserted into the guide groove so as to be relatively movable along the guide groove. - 請求項1に記載のスプール弁であって、
前記回転防止部材は前記スプールの端部に連結され、
前記キャップ内であって、前記スプールの前記端部と前記回転防止部材との間には、前記スプールを付勢するスプリングが設けられるスプール弁。 The spool valve according to claim 1,
The rotation preventing member is connected to an end of the spool;
A spool valve provided in the cap, and between the end of the spool and the rotation preventing member, a spring that biases the spool. - 請求項1に記載のスプール弁であって、
前記ガイド溝は、前記スプールにおける中立位置から一方のストローク端までのストローク長さの2倍以上の長さを有しているスプール弁。 The spool valve according to claim 1,
The guide groove has a length that is at least twice as long as a stroke length from a neutral position to one stroke end of the spool. - 請求項1に記載のスプール弁であって、
前記ガイド溝が前記回転防止部材に形成されるとともに、前記ガイド凸部が前記キャップの内壁に設けられ、
前記ガイド凸部は、ピン部材であり、
前記キャップは、前記キャップの内壁に設けられ前記ピン部材を挿入するピン穴と、前記ピン穴に対向する位置に設けられ前記ピン穴を形成するための穴開け具挿入孔と、を有するスプール弁。 The spool valve according to claim 1,
The guide groove is formed in the rotation preventing member, and the guide protrusion is provided on the inner wall of the cap,
The guide protrusion is a pin member,
The cap has a pin hole that is provided on an inner wall of the cap and into which the pin member is inserted, and a spool valve that is provided at a position facing the pin hole and that forms the pin hole. . - 請求項4に記載のスプール弁であって、
前記キャップ内には、パイロット室が形成され、
前記穴開け具挿入孔は、前記パイロット室にパイロット圧を導くパイロットポートであるスプール弁。 The spool valve according to claim 4,
A pilot chamber is formed in the cap,
The hole punch insertion hole is a spool valve that is a pilot port for guiding pilot pressure to the pilot chamber.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016114232A JP2017219123A (en) | 2016-06-08 | 2016-06-08 | Spool valve |
JP2016-114232 | 2016-06-08 |
Publications (1)
Publication Number | Publication Date |
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WO2017212681A1 true WO2017212681A1 (en) | 2017-12-14 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2017/004256 WO2017212681A1 (en) | 2016-06-08 | 2017-02-06 | Spool valve |
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JP (1) | JP2017219123A (en) |
WO (1) | WO2017212681A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10969026B2 (en) * | 2018-07-06 | 2021-04-06 | Kyb Corporation | Valve device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58175269U (en) * | 1982-05-20 | 1983-11-24 | エスエムシ−株式会社 | proportional valve |
JPH01150005A (en) * | 1987-11-04 | 1989-06-13 | Robert Bosch Gmbh | Hydraulic control valve |
-
2016
- 2016-06-08 JP JP2016114232A patent/JP2017219123A/en active Pending
-
2017
- 2017-02-06 WO PCT/JP2017/004256 patent/WO2017212681A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58175269U (en) * | 1982-05-20 | 1983-11-24 | エスエムシ−株式会社 | proportional valve |
JPH01150005A (en) * | 1987-11-04 | 1989-06-13 | Robert Bosch Gmbh | Hydraulic control valve |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10969026B2 (en) * | 2018-07-06 | 2021-04-06 | Kyb Corporation | Valve device |
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