WO2013137235A1 - 切換バルブ - Google Patents
切換バルブ Download PDFInfo
- Publication number
- WO2013137235A1 WO2013137235A1 PCT/JP2013/056765 JP2013056765W WO2013137235A1 WO 2013137235 A1 WO2013137235 A1 WO 2013137235A1 JP 2013056765 W JP2013056765 W JP 2013056765W WO 2013137235 A1 WO2013137235 A1 WO 2013137235A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spool
- passage
- pilot chamber
- switching valve
- small 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
- 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
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
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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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
-
- 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0712—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides comprising particular spool-valve sealing means
-
- 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
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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
- F16K31/124—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/355—Pilot pressure control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86582—Pilot-actuated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/8667—Reciprocating valve
- Y10T137/86694—Piston valve
- Y10T137/8671—With annular passage [e.g., spool]
Definitions
- the present invention relates to a switching valve that moves a spool by a pilot pressure to switch a flow path.
- JP2003-172310A issued by the Japan Patent Office proposes a pilot-type switching valve that moves the spool by pilot pressure and controls the flow of pressure oil by switching the passage formed in the spool housing.
- This type of switching valve has the end face of the spool slidably incorporated in the spool hole formed in the spool housing facing the pilot chamber.
- the prior art is provided with a small hole for discharging the air in the pilot chamber according to the displacement of the spool.
- the small hole has a large cross-sectional area, the pressure in the pilot chamber will decrease. Therefore, although the small hole needs to have a small cross-sectional area, it is difficult to form a fine small hole by allowing the drill to reach the center axis from the outer periphery of the spool. In particular, if the diameter of the spool is large, the drill is likely to be damaged during drilling.
- the object of the present invention is therefore to facilitate the formation of a pilot chamber air discharge passage.
- a switching valve includes a spool housing, a spool having a central shaft slidably mounted on the spool housing, a pilot chamber facing one end of the spool, and a central shaft.
- An axial passage that is formed in the spool in an eccentric position in the axial direction and communicates with the pilot chamber, a small hole that communicates with the axial passage and opens to the outer periphery of the spool, and a predetermined sliding position of the spool in the spool housing
- a passage formed in the spool housing for connecting the small hole to the drain.
- FIG. 1 is a longitudinal sectional view of a switching valve according to a first embodiment of the present invention.
- FIG. 2 is an enlarged longitudinal sectional view of a main part of the switching valve.
- FIG. 3 is a longitudinal sectional view of a switching valve according to a second embodiment of the present invention.
- FIG. 4 is an enlarged longitudinal sectional view of a main part of a switching valve according to a second embodiment of the present invention.
- FIG. 5 is a longitudinal sectional view of a switching valve of a comparative example not according to the present invention.
- FIG. 6 is an enlarged longitudinal sectional view of a main part of the switching valve of the comparative example.
- the switching valve according to the first embodiment of the present invention includes a spool 3 that is slidably received in a spool hole 2 formed in the spool housing 1.
- the spool 3 has a cylindrical shape having a central axis, and both ends of the spool 3 face the pilot chambers 5 in a pair of caps 4 fixed relative to the spool housing 1.
- a plurality of land portions 6a-6e and annular recesses 7a-7d that are in sliding contact with the spool hole 2 are alternately formed.
- the spool 3 slides left and right in the drawing in accordance with the pilot pressure guided to the pilot chambers 5 on both sides.
- notches n communicating with the annular recesses 7b and 7c are formed.
- a pair of actuator ports 8 and 9 are formed in the spool housing 1.
- the spool housing 1 is formed with a plurality of passages that face the outer periphery of the spool 3.
- an actuator passage 11 communicating with the actuator port 9 a tank passage 12 connected to the tank, a pump passage 13 connected to the hydraulic pump, a center passage 14, and a bridge passage 15 is formed in the spool housing 1.
- the center passage 14 and the bridge passage 15 are connected via a flow rate control valve 16 housed in the spool housing 1.
- the flow control valve 16 is formed in a cylindrical shape that airs the partition wall 16a.
- the flow control valve 16 is accommodated in a hole formed across the bridge passage 15 from the outer periphery of the spool housing 1 toward the center passage 14.
- two chambers are defined by a partition wall 16 a on the distal end side and the proximal end side.
- a pair of communication holes 16 b communicating with the chamber on the front end side is formed on the outer periphery of the flow control valve 16.
- a spring member 17 that presses the flow control valve 16 in the direction of the center passage 14 is accommodated in the base end side chamber.
- coil springs 20 are provided for holding the spool 3 in the neutral position.
- the spool 3 is provided with a small-diameter protrusion 3 a that protrudes into the pilot chamber 5.
- the spool 3 abuts against one end of the coil spring 20 via a ring spring receiving member 21 slidably fitted to the outer periphery of the protrusion 3 a via a sliding gap 25.
- the other end of the coil spring 20 is supported by the cap 4 via another spring receiving member 22.
- Another spring receiving member 22 is formed with a pilot passage 22a.
- the pilot passage 22 passes through another spring receiving member 22 in the axial direction and connects the pilot chamber 5 to a pilot circuit (not shown).
- the joint between the cap 4 and the spool housing is sealed by a seal member 30.
- the axial passage 23 is formed in the spool 3.
- the axial passage 23 is formed at a position eccentric from the central axis of the spool 3 and parallel to the central axis.
- One end of the axial passage 23 has an opening 23 a on the radially outer side of the protrusion 3 a on the end face of the spool 3.
- the opening 23 a faces the spring receiving member 21. In the state where the coil spring 20 is most extended, the opening 23 a is closed by the spring receiving member 21.
- a small hole 24 is formed in the radial direction from the outer periphery of the spool 3 toward the axial passage 23.
- the small hole 24 is formed at an angular position where the distance between the outer periphery of the spool 3 and the axial passage 23 at the eccentric position is the shortest.
- the small hole 24 is closed by facing the wall surface of the spool hole 2 when the spool 3 is in the neutral position shown in the figure.
- the spool 3 communicates with the tank passage 12 in the process of displacement.
- one actuator passage 11 communicates with the bridge passage 15 via the annular recess 7d of the spool. Further, the pump passage 13 and the center passage 14 communicate with each other through a notch n formed in the central land portion 6c.
- the other actuator passage 10 communicates with the tank passage 12 via the annular recess 7a of the spool 3.
- the return oil flowing into the actuator port 8 is returned to the tank.
- FIG. 2 the pilot chamber side opening 23 a of the axial passage 23 is closed by the spring receiving member 21. From this state, when the spool 3 is displaced in the left direction in the figure, the pilot chamber 5 and the pilot chamber side opening 23a communicate with each other via the sliding gap 25 between the outer periphery of the protrusion 3a and the spring receiving member 21.
- the axial passage 23 is formed at a position eccentric from the center axis of the spool 3. Therefore, the shortest distance from the outer periphery of the spool 3 to the axial passage 23 is shortened, and the length of the small hole 24 formed at the angular position corresponding to the shortest distance can be shortened.
- the straight small hole 24 can be easily formed even if a drill having a small diameter is used. Therefore, the possibility of damaging the tool when forming the small hole 24 is reduced, and the drilling operation can be performed efficiently.
- the axial passage 23 is formed in parallel with the central axis of the spool 3, so that the length can be made shorter than that formed obliquely with respect to the central axis. If the length of the axial passage 23 can be shortened, the axial passage 23 can be easily formed accordingly.
- the axial passage 23 does not have to be formed in parallel with the axis line as long as it is eccentric from the central axis of the spool 3.
- Forming the small holes 24 in the radial direction of the spool 3, that is, in a direction perpendicular to the central axis of the spool 3 facilitates the processing of the small holes 24. Further, the distance to the axial passage 23 is also the shortest. However, the formation direction of the small holes 24 is not necessarily orthogonal to the central axis.
- the position where the small hole 24 communicates with the tank passage 12 may be anywhere as long as the spool 3 is being displaced. If the position is set so that the small hole 24 and the tank passage 12 communicate with each other when the spool 3 has a full stroke, the pilot chamber 5 does not communicate with the tank passage 12 until the spool 3 has a full stroke. Such a setting is also preferable in order to reduce the leakage of the pilot pressure to the tank passage 12 during the displacement of the spool 3.
- FIG. 1 A second embodiment of the present invention will be described with reference to 3 and 4.
- the switching valve according to this embodiment is different from the first embodiment in that an axial oil passage 26 and radial oil passages 28 and 29 are formed in the spool 3.
- Other configurations are the same as those of the first embodiment.
- the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment.
- the spool 3 is slidably received in the spool hole 2 formed in the spool housing 1. Both ends of the spool 3 face pilot chambers 5 in a pair of caps 4 fixed to the spool housing 1.
- a plurality of land portions 6a-6e and annular recesses 7a-7d that are in sliding contact with the spool hole 2 are alternately formed.
- the actuator passage 10 By displacing the spool 3 from the neutral position to the right or left in the figure by the pilot pressure guided to one pilot chamber 5, the actuator passage 10 is connected to one of the pump passage 13 and the tank passage 12, and the actuator passage 11 is The pump passage 13 and the tank passage 12 are respectively connected to the other.
- the spool 3 is formed with an axial oil passage 26 on the central axis.
- One end of the axial passage 26 has an opening at the end face of the spool 3. This opening is closed by the plug 27.
- the radial oil passages 28 and 29 are formed in the spool 3 so as to penetrate the spool 3 in the transverse direction.
- the radial oil passages 28 and 29 intersect with the axial oil passage 26 to communicate with each other via the axial oil passage 26.
- the radial oil passage 28 is formed at a position communicating with the tank passage 12 within a predetermined stroke range of the spool 3.
- the radial oil passage 29 is formed at a position communicating with the bridge passage 15 within a predetermined stroke range of the spool 3.
- a bleed-off passage for controlling the amount of hydraulic oil supplied to the actuator passage 11 is formed by the axial oil passage 26 and the radial oil passages 28 and 29.
- an axial passage 23 and a small hole 24 are formed at the same position as in the first embodiment.
- this switching valve having another axial passage 26 on the central axis, the sliding gap 25, the axial passage 23, and the small passage according to the displacement of the spool 23, as in the first embodiment.
- a minute flow of hydraulic oil from the pilot passage 5 to the tank passage 12 is formed through the hole 24. The air that has entered the pilot chamber 5 is discharged into the tank by this minute flow of hydraulic oil.
- the axial passage 23 is formed at a position eccentric from the central axis of the spool 3, the distance of the small hole 24 can be shortened. Therefore, the possibility of damaging the drill when forming the small hole 24 is reduced, and the drilling operation can be performed efficiently.
- FIG. 4 shows only the axial passage 23 and the small hole 24 on the one pilot chamber 5 side.
- An axial passage 23 and a small hole 24 having the same specifications as described above are also formed at the end of the spool 3 on the other pilot chamber 5 side shown in FIG.
- FIG. 3 When the pilot pressure is guided to the left pilot chamber 5 in FIG. 3, the spool 3 is displaced to the right side in the drawing, and the pilot chamber 5 communicates with the tank passage 12 through the small hole 24 on the left side and the axial passage 23. .
- the axial oil passage 26 and the radial oil passages 28 and 29 may be formed as bleed-off passages for controlling the amount of hydraulic oil supplied to the actuator passage 10.
- the present invention can also be applied to a switching valve having another axial passage 26 on the central axis of the spool 3.
- the pilot chamber 5 and the axial passage 23 are communicated with each other via a sliding gap 25 between the protrusion 3 a of the spool 3 and the spring receiving member 21. If the opening area of the sliding gap 25 is made smaller than the cross-sectional area of the small hole 24, the leakage of the pilot pressure can be reduced without depending on the throttling function of the small hole 24. That is, by causing the sliding gap 25 to function as a diaphragm, the cross-sectional area of the small hole 24 can be increased, and the formation of the small hole 24 is further facilitated.
- both ends of the spool 3 face the pilot chamber.
- the present invention is also applicable to a switching valve in which the pilot chamber 5 is provided only on one side of the spool 3. Even in that case, the same advantageous effects as those of the first and second embodiments can be obtained in facilitating the formation of the small holes 24.
- FIG. A comparative example to which the present invention is not applied will be described with reference to 5 and 6.
- the switching valve shown in 5 and 6 includes an axial passage 18 formed on the central axis of the spool 3 instead of the axial passage 23 of the first and second embodiments.
- a small hole 19 is formed in the radial direction from the outer periphery of the spool 3 toward the axial passage 18.
- One end of the axial passage 18 opens toward the cap chamber 4 through the protrusion 3a.
- the axial passage 18, the small hole 19, and the protrusion 3 a described above are shown in FIG. 5 are provided at both ends of the spool 3, respectively.
- the small hole 19 opened to the outer periphery of the spool 3 communicates with the tank passage 12 according to the displacement of the spool 3.
- a flow of hydraulic oil from the pilot passage 5 to the tank passage 12 is formed through the axial passage 18 and the small hole 19, and the air that has entered the pilot chamber 5 can be discharged.
- the pilot pressure may be lowered.
- the diameter of the small hole 19 needs to be reduced in order to suppress the outflow amount.
- the small hole 24 is shorter than in the comparative example, so that the drilling operation by the drill of the small hole 24 is performed by the drill of the small hole 18 of the comparative example. It is easier than drilling and the probability of damaging the drill is low.
- the present invention brings about a favorable effect in that it is easy to form an air discharge passage of various pilot-type switching valves.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Driven Valves (AREA)
- Fluid-Pressure Circuits (AREA)
- Sliding Valves (AREA)
Abstract
Description
Claims (6)
- スプールハウジングと;
スプールハウジングに摺動可能に収装された中心軸を有するスプールと;
スプールの一端に臨むパイロット室と;
中心軸から偏心位置でスプールに軸方向に形成され、パイロット室に連通可能な軸方向通路と;
軸方向通路に連通し、スプールの外周に開口する小孔と;
スプールハウジング内のスプールの所定の摺動位置で、小孔をタンクに接続するスプールハウジングに形成された通路、
とを備える切換バルブ。 - 小孔はスプールの中心軸と直交する向きに形成される請求項1の切換バルブ。
- 所定の摺動位置はスプールのフルストローク状態に相当する請求項1の切換バルブ。
- 軸方向通路はスプールの中心軸に平行である請求項1の切換バルブ。
- スプールはパイロット室内に軸方向に突出する突部を備え、スプールはパイロット室内に収装されたスプリングに、突部の外周に摺動自由に嵌合するばね受けを介して支持され、軸方向通路とパイロット室は、突部の外周とばね受けとの摺動隙間を介して連通する請求項1の切換バルブ。
- スプールは、中心軸上に形成された別の軸方向通路と、別の軸方向通路に連通するラジアル方向油路とを備える請求項1の切換バルブ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020147003272A KR101516133B1 (ko) | 2012-03-15 | 2013-03-12 | 전환 밸브 |
EP13760558.0A EP2827033B1 (en) | 2012-03-15 | 2013-03-12 | Change over valve |
US14/372,754 US9719609B2 (en) | 2012-03-15 | 2013-03-12 | Change-over valve |
CN201380002613.2A CN103765066B (zh) | 2012-03-15 | 2013-03-12 | 切换阀 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-058164 | 2012-03-15 | ||
JP2012058164A JP5916450B2 (ja) | 2012-03-15 | 2012-03-15 | 切換バルブ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013137235A1 true WO2013137235A1 (ja) | 2013-09-19 |
Family
ID=49161141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/056765 WO2013137235A1 (ja) | 2012-03-15 | 2013-03-12 | 切換バルブ |
Country Status (6)
Country | Link |
---|---|
US (1) | US9719609B2 (ja) |
EP (1) | EP2827033B1 (ja) |
JP (1) | JP5916450B2 (ja) |
KR (1) | KR101516133B1 (ja) |
CN (1) | CN103765066B (ja) |
WO (1) | WO2013137235A1 (ja) |
Cited By (4)
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US20170198727A1 (en) * | 2014-06-23 | 2017-07-13 | Parker-Hannifin Corporation | Oil exchange in hydraulically operated and electro-hydraulically operated hydraulic valves |
EP3205888A4 (en) * | 2014-10-06 | 2018-06-27 | KYB-YS Co., Ltd. | Fluid pressure control device |
US20180187787A1 (en) * | 2015-07-10 | 2018-07-05 | Kyb Corporation | Rod-shaped member and valve device |
CN110124191A (zh) * | 2019-06-03 | 2019-08-16 | 江苏丞宇米特医疗科技有限公司 | 阀体 |
Families Citing this family (10)
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Also Published As
Publication number | Publication date |
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CN103765066A (zh) | 2014-04-30 |
CN103765066B (zh) | 2015-09-23 |
US20150013805A1 (en) | 2015-01-15 |
EP2827033A1 (en) | 2015-01-21 |
JP5916450B2 (ja) | 2016-05-11 |
JP2013190075A (ja) | 2013-09-26 |
US9719609B2 (en) | 2017-08-01 |
EP2827033B1 (en) | 2018-01-03 |
EP2827033A4 (en) | 2015-08-12 |
KR20140034926A (ko) | 2014-03-20 |
KR101516133B1 (ko) | 2015-04-29 |
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