JP2019143781A - Spool valve - Google Patents

Abstract

To provide a spool valve which can prevent a fluid from leaking from a feed back groove through a gap between an outer peripheral surface of a sleeve and an inner peripheral surface of a housing.SOLUTION: In a spool valve 1, a spool 22 is disposed within a sleeve 21 formed with an input port 24, an outlet port 25, and a feed back port 28 so as to be movable in a longitudinal direction and the output port 25 and the feed back port 28 communicate with each other in a state where the sleeve 21 is attached to an attachment hole 8a of a housing 8. A feed back groove 10 allowing communication between the output port 25 and the feedback port 28 and forming at least a part of a spiral is formed at an outer periphery of the sleeve 21.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a spool valve used for hydraulic control of a hydraulic circuit, for example.

  The spool valve controls the pressure and flow rate of the control fluid in the fluid circuit using a spool that is movable in the axial direction by a drive unit using a solenoid. As a conventional spool valve, it comprises a spool housed in a sleeve and an electromagnetic part (solenoid part) arranged on one end side of the spool and acting in the axial direction by a solenoid, and a pressure source such as a pump or an accumulator; There has been known one that supplies a control fluid, which is arranged between a load and a pressure or flow rate adjusted by movement of a spool, to the load (for example, see Patent Document 1).

  The sleeve of the spool valve of Patent Document 1 has an input port to which a control fluid is input, an output port for outputting the control fluid, and a feedback port to which a part of the control fluid output from the output port is fed back. The output port and the feedback port are formed separately in a groove (feedback groove) formed in the outer peripheral surface of the sleeve so as to extend parallel to the axial direction. The groove is closed by the inner peripheral surface of the mounting hole in a state where the sleeve is mounted in the mounting hole of the housing, and a flow path is formed by the inner peripheral surface of the groove and the mounting hole. The output port and the feedback port communicate with each other through the groove. The spool has a first large diameter portion that directly opens and closes the input port, and a second large diameter portion that is spaced apart from the first large diameter portion in the axial direction. The diameter is smaller than the large diameter part.

  The spool valve can adjust the communication state between the input port and the output port by displacing the spool in the axial direction by a solenoid portion. In the case of the spool valve of Patent Document 1, when a part of the control fluid output from the output port is input to the feedback port through the groove, the cross-sectional area of the first large diameter part and the second large diameter cross-sectional area are obtained. In the direction of pushing the spool to one side, corrects the communication state between the input port and output port against disturbance such as pressure fluctuation of the input control fluid, The pressure can be adjusted to the target value.

JP 2006-46640 A (page 8, FIG. 1)

  However, in such a spool valve, since the groove for communicating the output port and the feedback port is formed extending in parallel with the axial direction of the sleeve, the control fluid flowing in the groove causes the sleeve in the radial direction of the sleeve. Pressure is applied only to a part (the part provided with the groove), the sleeve tilts in the mounting hole of the housing, a gap is formed between the outer peripheral surface of the sleeve and the inner peripheral surface of the housing, and the control fluid leaks from the gap. There was a risk of getting out.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a spool valve in which fluid is less likely to leak from a feedback groove through a gap between an outer peripheral surface of a sleeve and an inner peripheral surface of a housing.

In order to solve the above-described problem, the spool valve of the present invention includes:
A spool is movably disposed in a longitudinal direction inside a sleeve formed with an input port, an output port, and a feedback port, and the output port and the feedback port communicate with each other in a state of being mounted in a mounting hole of the housing. A spool valve,
A feedback groove that forms at least a part of a spiral that communicates the output port and the feedback port is formed on the outer periphery of the sleeve.
According to this feature, since the feedback groove communicating the output port and the feedback port extends so as to intersect the axial direction on the outer peripheral surface of the sleeve, the force acting on the sleeve from the control fluid flowing through the feedback groove is Therefore, the sleeve is not easily tilted in the mounting hole of the housing, and the control fluid can be prevented from leaking from the feedback groove through the gap between the outer peripheral surface of the sleeve and the inner peripheral surface of the housing. Moreover, since the weight balance of the sleeve is good, when the spool valve is mounted in the mounting hole of the housing, a load is locally applied to the sleeve, and deformation or breakage can be avoided.

The output port is disposed in a first circumferential groove formed on the outer periphery of the sleeve;
The feedback port is disposed in a second circumferential groove formed on the outer periphery of the sleeve;
The first circumferential groove and the second circumferential groove communicate with each other through the feedback groove.
According to this feature, since the first circumferential groove and the second circumferential groove extend in the circumferential direction, the degree of freedom in arranging the feedback grooves is high.

The feedback groove extends continuously in the first circumferential groove and in the second circumferential groove.
According to this feature, the flow of the control fluid can be guided toward the output port and the feedback port.

The feedback groove is arranged over 180 degrees or more and less than 450 degrees of the sleeve.
According to this feature, the force acting on the sleeve from the control fluid flowing in the feedback groove is dispersed in the circumferential direction of the sleeve, the feedback groove is short, the feedback responsiveness is good, and the spool valve responsiveness is good.

The input port is provided between the output port and the feedback port, and the feedback groove is arranged to avoid the input port.
According to this feature, the sealing performance between the input port and the feedback groove is excellent.

The radial direction view is characterized in that the input port and the feedback groove are arranged at positions facing each other across the shaft of the sleeve.
According to this feature, the sealing performance between the input port and the feedback groove is excellent.

The feedback groove is formed in a straight line in a state where the sleeve is cut along the axial direction and developed in a plane.
According to this feature, since the output port and the feedback port communicate with each other at the shortest distance, the feedback groove is short, the feedback responsiveness is good, and the spool valve responsiveness is good.

It is a perspective view of the spool valve in Example 1 of the present invention. It is a sectional side view which shows the state which mounted | wore the housing with the spool valve in Example 1. FIG. 3 is an enlarged perspective view of a main part of a sleeve in Embodiment 1. FIG. It is AA sectional drawing of FIG. (A) is the upper side figure of the sleeve in Example 1, (b) is a side view similarly. It is a top view of the sleeve in Example 2 of the present invention. It is a top view of the sleeve in Example 3 of the present invention. (A) is a sleeve top view in Example 4 of this invention, (b) is a side view similarly. (A) is a top view of the sleeve in Example 5 of this invention, (b) is a side view similarly. (A)-(b) is a schematic diagram which shows the variation of the cross-sectional shape of the feedback groove | channel in this invention.

  EMBODIMENT OF THE INVENTION The form for implementing the spool valve which concerns on this invention is demonstrated below based on an Example.

  The spool valve according to the first embodiment will be described with reference to FIGS. In the following description, the left side of FIG. 2 is defined as one axial end side of the spool valve, and the right side of FIG. 2 is defined as the other axial end side of the spool valve.

  The spool valve 1 is a spool type solenoid valve, and is used for an apparatus controlled by hydraulic pressure such as an automatic transmission of a vehicle. The spool valve 1 is mounted in the horizontal direction in the mounting hole 8a (see FIG. 2) of the valve housing 8.

  As shown in FIGS. 1 and 2, the spool valve 1 is configured such that a valve unit 2 that adjusts the flow rate of a fluid (control fluid such as oil) is integrally attached to a solenoid unit 3 as an electromagnetic drive unit. Yes. FIG. 2 shows the off state of the spool valve 1 in which the coil 34 of the solenoid molded body 31 is not energized.

  First, the structure of the solenoid unit 3 will be described. As shown in FIG. 2, the solenoid unit 3 includes a solenoid case 30 formed of a magnetic metal material such as iron, a solenoid molded body 31 accommodated in the solenoid case 30, and an inner side of the solenoid molded body 31. The center post 32 (fixed iron core) is mainly configured.

  The solenoid molded body 31 is formed by molding the coil 34 with the resin 35, and a control current is supplied from the connector of the connector portion 35a extending to the outside from the opening 30j provided on the lower side in the radial direction of the solenoid case 30. The coil 34 is supplied.

  The center post 32 is configured in a cylindrical shape with a flange including a cylindrical portion 32a and a flange portion 32c extending in the radial direction at the other axial end portion (right side in FIG. 2) of the cylindrical portion 32a. A through hole 32d capable of accommodating the plunger 4 (movable iron core) and the rod 5 is formed at the center of the cylindrical portion 32a in the radial direction. A holder 36 made of resin or the like is attached to the opening end on one end side in the axial direction of the cylindrical portion 32a (left side in FIG. 2).

  In addition, the cylindrical portion 32a of the center post 32 is provided with a thin portion 32b that is formed to have a thin plate thickness when a substantially center in the axial direction of the outer peripheral surface is recessed in an isosceles trapezoidal shape in a cross-sectional view across the circumferential direction. It has been.

  The flange portion 32c of the center post 32 is provided with a concave portion 32e recessed at one axial end side at the radial center of the end surface on the other axial end side, and one axial end portion of the sleeve 21 described later is inserted into the concave portion 32e. In this state, the solenoid case 30 is externally fitted to the flange portion 32c and fixed by caulking. The solenoid molded body 31 is integrally formed on the outer diameter side of the center post 32.

  Next, the structure of the valve unit 2 will be described. As shown in FIG. 2, the valve unit 2 includes an input port 24, an output port 25, discharge ports 26 a and 26 b, a drain port 27, a feedback connected to a flow path provided in the mounting hole 8 a of the valve housing 8. A sleeve 21 provided with openings of various ports such as a port 28, a spool 22 accommodated in a liquid-tight manner in a through hole 21a formed in the axial direction on the inner diameter side of the sleeve 21, and the spool 22 on one end side in the axial direction It comprises a coiled spring 29 that urges and a retainer 23 that holds the spring. The sleeve 21, the spool 22, and the retainer 23 are made of a material such as aluminum, iron, stainless steel, or resin.

  As shown in FIGS. 2 and 3, an annular first circumferential groove 21 b and an annular second circumferential groove 21 c that are continuous in the circumferential direction are formed on the outer circumferential surface of the sleeve 21 so as to be spaced apart in the axial direction. Has been. Two output ports 25, 25 are formed in the first circumferential groove 21b so as to be spaced apart from each other in the circumferential direction, and the second circumferential groove 21c is formed on one end side in the axial direction from the first circumferential groove 21b. One feedback port 28 is formed.

  The output port 25 is positioned upward in a state where it is attached to the valve housing 8, and the feedback port 28 is substantially in the circumferential direction from a substantially middle point of the output ports 25, 25 (above the central axis of the sleeve 21). It is arranged at a position shifted by 90 degrees (a lateral position of the central axis of the sleeve 21).

  Further, on the outer peripheral surface of the sleeve 21, a land portion 21d is formed between the first circumferential groove 21b and the second circumferential groove 21c, and two input ports 24, 24 are arranged in the circumferential direction on the land portion 21d. Are spaced apart from each other. That is, the input port 24 is provided between the output port 25 and the feedback port 28 in the axial direction.

  As shown in FIGS. 3 and 5, a feedback groove 10 that communicates the first circumferential groove 21 b and the second circumferential groove 21 c is formed on the outer peripheral surface of the sleeve 21 so as to avoid the input port 24. As a result, the output port 25 and the feedback port 28 communicate with each other.

  The feedback groove 10 has a U-shape (a U-shape) having a right-angled cross-sectional view opening in the outer diameter direction (see FIG. 4), and has one axial end from the vicinity of the output port 25 to the vicinity of the feedback port 28. It extends spirally counterclockwise from the side toward the other end side in the axial direction. In other words, the feedback groove 10 extends in a direction intersecting with the axial direction of the sleeve 21.

  That is, the feedback groove 10 extends so as to extend over the first circumferential groove 21b, the land portion 21d, and the second circumferential groove 21c, and the depth of the feedback groove 10 is the first circumferential groove 21b. And it is deeper than the depth of the second circumferential groove 21c (see FIG. 4). The feedback groove 10 has substantially the same width in the land portion 21d and the width in the first circumferential groove 21b and the second circumferential groove 21c. Furthermore, in the present embodiment, the feedback groove 10 is formed over approximately 420 degrees in the circumferential direction of the sleeve 21.

  Further, as shown in FIG. 4, the input ports 24 and 24 and the feedback groove 10 are arranged at positions substantially facing each other with the shaft of the sleeve 21 interposed therebetween. Specifically, the input ports 24 and 24 are provided above the sleeve 21, and the portions of the feedback groove 10 that are in the same axial position as the input ports 24 and 24 are provided below the sleeve 21. It has been.

  In particular, as shown in FIG. 5, the feedback groove 10 forms a straight line when viewed from the top and side surfaces. In other words, the feedback groove 10 forms a straight line in a state where the sleeve 21 is cut along the axial direction and developed in a plane.

  Returning to FIG. 2, the drain port 27 is formed at one end of the sleeve 21 in the axial direction. In the present embodiment, a space S1 formed at one end in the axial direction of the through hole 21a of the sleeve 21 and a groove 21e provided on the outer periphery of the sleeve 21 are communicated with each other by a drain port 27. In the space S1, the fluid existing around the spool 22 and the rod 5 flows in and out through the drain port 27 to breathe, so that the spool 22 and the rod 5 are smoothly moved in the axial direction. .

  The discharge port 26a is formed to be separated from the other end side in the axial direction of the output port 25, communicates with an oil pan on the pressure source side (not shown), and is a space formed at a substantially central portion in the axial direction of the sleeve 21. The fluid of S2 is returned to the oil pan. The output port 25 communicates with the space S2.

  The discharge port 26 b is formed at the other axial end of the sleeve 21, and is located above when the spool valve 1 is mounted on the valve housing 8. In the discharge port 26b, a space S3 formed at the other axial end of the through hole 21a of the sleeve 21 and a groove portion 21f provided on the outer periphery of the sleeve 21 are communicated with each other by the discharge port 26b. As a result, the spool 22 is moved smoothly in the axial direction.

  The groove portion 21f is continuous in the circumferential direction of the sleeve 21, and the end portion of the pin 9 inserted from the outside (below) of the valve housing 8 is inserted into the groove portion 21f. The spool valve 1 is prevented from coming off.

  The valve portion 2 configured as described above is configured so that the first circumferential groove 21b, the second circumferential groove 21c, the feedback groove 10, and the groove portion 21e are opened on the outer diameter side when the spool valve 1 is mounted on the valve housing 8. Is closed by the inner peripheral surface of the mounting hole 8a, and fluid is prevented from leaking from the outer diameter side opening of each groove.

  As shown in FIG. 2, the spool 22 includes a first land portion 22 a, a second land portion 22 b, and a third land portion 22 c that slide on the inner peripheral surface of the through hole 21 a of the sleeve 21. It is provided sequentially toward the other end side in the direction. The second land portion 22b directly opens and closes the input port 24, and the third land portion 22c directly opens and closes the discharge port 26a. The first land portion 22a has a smaller diameter than the second land portion 22b.

  A connecting portion 22d having a smaller diameter than the second land portion 22b and the third land portion 22c is provided between the second land portion 22b and the third land portion 22c. The outer peripheral surface of the connecting portion 22d and the sleeve 21 are provided. A space S2 is formed with the inner peripheral surface of the through hole 21a.

  The spool valve 1 of this embodiment is a normally open type spool valve in which the input port 24 and the output port 25 communicate with each other when the control current is not supplied to the coil 34 (non-conduction).

  When the spool valve 1 is not conducting, a fluid is output from the output port 25, and a part of the output fluid passes through the feedback groove 10 and the feedback port 28 described above, and the first land portion 22a and the second land portion 22b. Flows in between. The fluid flowing between the first land portion 22a and the second land portion 22b causes the spool 22 to move to the other end side in the axial direction due to the difference in the cross-sectional area of the first land portion 22a and the cross-sectional area of the second land portion 22b. It acts in the pushing direction (direction in which the communication state between the input port 24 and the output port 25 is closed) (hereinafter, this force is referred to as feedback force).

  When a control current is supplied to the coil 34 (when energized), a magnetic attractive force that moves the plunger 4 to the other end in the axial direction is generated. When the spool valve 1 is energized, the magnetic attraction force toward the other axial end of the plunger 4 and the rod 5 increases as the energization amount to the coil 34 increases, and accordingly, the spool 22 moves toward the other axial end. When the displacement increases, the communication state between the input port 24 and the output port 25 (the opening degree of the input port 24) decreases, and the flow rate (fluid pressure) of the fluid output from the output port 25 decreases.

  When the fluid pressure output from the output port 25 decreases below a predetermined target value, the feedback force described above also decreases, so that the spool 22 is displaced (pushed back) toward one end in the axial direction by the urging force of the spring 29. As a result, the communication state between the input port 24 and the output port 25 is corrected so as to increase, so that the fluid pressure output from the output port 25 is increased and controlled to reach the target value. Yes.

  As described above, the spool 22 is disposed in the sleeve 21 in which the input port 24, the output port 25, and the feedback port 28 are formed so as to be movable in the longitudinal direction, and is mounted in the mounting hole 8a of the valve housing 8. In the spool valve 1 in which the output port 25 and the feedback port 28 communicate with each other in a state where the output port 25 and the feedback port 28 communicate with each other, a feedback groove 10 that forms a spiral that communicates the output port 25 and the feedback port 28 is formed on the outer periphery of the sleeve 21. .

  As described above, the feedback groove 10 communicating the output port 25 and the feedback port 28 extends spirally so as to intersect the axial direction on the outer peripheral surface of the sleeve 21, so that the fluid flowing through the feedback groove 10 is transferred to the sleeve 21. The acting force is distributed in the circumferential direction of the sleeve 21, and the sleeve 21 hardly tilts in the mounting hole 8 a of the valve housing 8, and is fed back through a gap between the outer peripheral surface of the sleeve 21 and the inner peripheral surface of the valve housing 8. It is possible to prevent the control fluid from leaking from the groove 10.

  Further, since the feedback grooves 10 are formed in a distributed manner in the circumferential direction of the sleeve 21, the weight balance is better than the form in which the feedback grooves are formed along the axial direction of the sleeve 21, and the spool valve 1 is connected to the valve housing 8. When the sleeve 21 is attached to the sleeve 21, it is possible to avoid local deformation and deformation or damage to the sleeve 21. Further, a load is not easily applied to the pin 9 that fixes the spool valve 1 to the valve housing 8, and deformation and breakage of the pin 9 can be avoided.

  The output port 25 is disposed in the first circumferential groove 21b formed on the outer periphery of the sleeve 21, and the feedback port 28 is disposed in the second circumferential groove 21c formed on the outer periphery of the sleeve 21, The first circumferential groove 21b and the second circumferential groove 21c communicate with each other through the feedback groove 10.

  According to this, since the first circumferential groove 21b and the second circumferential groove 21c extend in the circumferential direction, regardless of the relative position between the output port 25 and the feedback port 28 or the position of the input port 24, The connecting portion between the feedback groove 10 and the first circumferential groove 21b and the connecting portion between the feedback groove 10 and the second circumferential groove 21c can be freely designed in the circumferential direction.

  In the present embodiment, the first circumferential groove 21b and the second circumferential groove 21c are continuous in the circumferential direction of the sleeve 21 and have an annular shape when viewed from the axial direction. However, the first circumferential groove 21b As long as the second circumferential groove 21 c is formed to be long in the circumferential direction of the sleeve 21, the second circumferential groove 21 c is not necessarily provided in an annular shape.

  The feedback groove 10 also extends continuously in the first circumferential groove 21b and the second circumferential groove 21c. Specifically, the feedback groove 10 extends spirally counterclockwise from the vicinity of the output port 25 to the vicinity of the feedback port 28 from one axial end to the other axial end. Since the depth is deeper than the depths of the first circumferential groove 21b and the second circumferential groove 21c, the fluid flow can be guided toward the output port 25 and the feedback port 28.

  Further, the feedback groove 10 is formed over approximately 420 degrees in the circumferential direction of the sleeve 21. That is, since the feedback groove 10 is arranged over 180 degrees in the circumferential direction of the sleeve 21, the force acting on the sleeve 21 from the fluid flowing through the feedback groove 10 is dispersed in the circumferential direction of the sleeve 21, and the feedback groove 10 is less than 450 degrees in the circumferential direction of the sleeve 21, the length of the feedback groove 10 is short, the feedback responsiveness is good, and the responsiveness of the spool valve 1 is good.

  The input port 24 is provided between the output port 25 and the feedback port 28, and the feedback groove 10 is disposed so as to avoid the input port 24. According to this, since the input port 24 is provided between the output port 25 and the feedback port 28, the length between the sleeve 21 in the axial direction is shortened and the distance between the input port 24 and the feedback groove 10 is reduced. Sealability can be secured.

  Further, when viewed in the radial direction, the input port 24 and the feedback groove 10 are disposed at positions facing each other across the axial center of the sleeve 21. More specifically, the input ports 24 and 24 are provided above the sleeve 21 in the axial position at a certain axial position, and the feedback groove 10 is provided below the sleeve 21. It is provided and is arranged at a position facing each other across the shaft.

  According to this, fluid does not enter and exit between the input ports 24 and 24 and the feedback groove 10, and the sealability between the input ports 24 and 24 and the feedback groove 10 is excellent.

  In addition, the feedback groove 10 forms a straight line in a state where the sleeve 21 is cut along the axial direction and developed in a plane. According to this, since the output port 25 and the feedback port 28 communicate with each other at the shortest distance while the feedback groove 10 is arranged on the entire circumference, the responsiveness of the spool valve 1 is good.

  Next, the feedback groove according to the second embodiment will be described with reference to FIG. Note that the same components as those shown in the embodiment are given the same reference numerals and redundant description is omitted.

  The feedback groove 102 of the second embodiment extends in the circumferential direction of the sleeve 21 so as to intersect the axial direction over approximately 90 degrees, and is formed in the upper and lower portions of the land portion 21d. The feedback groove 102 is formed counterclockwise from the one axial end side to the other axial end side. Even with such a feedback groove 102, the fluid flowing through the feedback groove 102 can be effectively dispersed in the circumferential direction of the sleeve 21.

  Thus, the feedback groove does not need to be provided at 360 degrees or more in the circumferential direction of the sleeve 21 and may extend so as to intersect the axial direction (at least part of the spiral may be formed). The feedback groove is preferably formed at 180 degrees or more in the circumferential direction of the sleeve 21, but as in the second embodiment, the feedback groove is provided at 180 degrees or more in the circumferential direction of the sleeve 21 by the sum of the plurality of feedback grooves. It may be.

  Further, as in the second embodiment, the feedback groove may not be provided in the first circumferential groove 21b and the second circumferential groove 21c, and at least the first circumferential groove 21b and the second circumferential groove 21c. Need only be communicated with each other.

  Next, the feedback groove according to the third embodiment will be described with reference to FIG. The feedback groove 103 according to the third embodiment is formed in a substantially arc shape in the radial direction so as to avoid the input port 24 in the land portion 21d. According to this, the feedback groove 103 can be freely formed regardless of the position of the input port 24. Note that the shape of the feedback groove is not limited to a substantially arc shape, and may be a wave shape or the like.

  Next, the feedback groove according to the fourth embodiment will be described with reference to FIG. The feedback groove 104 according to the fourth embodiment includes a spiral portion 104a that extends substantially 450 degrees in the circumferential direction avoiding the input port 24 at a substantially central portion in the axial direction of the land portion 21d, and a second end from both ends of the spiral portion 104a. Linear portions 104b and 104c extending along the axial direction toward the first circumferential groove 21b and the second circumferential groove 21c.

  The straight portion 104b formed on one end side in the axial direction communicates with the second circumferential groove 21c at a position overlapping the feedback port 28 in the axial direction. Further, the straight line portion 104c formed on the other end side in the axial direction communicates with the first circumferential groove 21b at a position that overlaps with a substantially intermediate position between the output ports 25 and 25 in the axial direction. According to this, the fluid flowing through the feedback groove 104 can be guided toward the output ports 25 and 25 and the feedback port 28.

  Thus, the feedback groove may have a portion extending in the axial direction at a part thereof. Although not shown, the feedback groove may have a portion extending perpendicularly to the axial direction at a part thereof.

  Next, a sleeve according to Embodiment 5 will be described with reference to FIG. The outer circumferential surface of the sleeve 210 of the fifth embodiment is substantially flush with the first circumferential groove 21b and the second circumferential groove 21c, as in the first to fourth embodiments.

  Further, the feedback groove 105 of the fifth embodiment extends in a spiral shape so as to avoid the input port 24 on the outer peripheral surface of the sleeve 210, and directly connects the output ports 25, 25 and the feedback port 28.

  As described above, the feedback groove only needs to be able to connect the output ports 25 and 25 and the feedback port 28. Therefore, the configuration of the first circumferential groove 21b and the second circumferential groove 21c can be omitted and the structure can be simplified.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is. Further, the matters described in each embodiment can be applied to other embodiments as long as no contradiction occurs.

  For example, in the first to fourth embodiments, the input port 24 is formed in the land portion 21d, the output port 25 is formed in the first circumferential groove 21b, and the feedback port 28 is formed in the second circumferential groove 21c. Although the form has been illustrated, the feedback groove may be formed so as to extend so as to intersect the axial direction.

  For example, although not shown, the input port 24 is formed in the circumferential groove provided on the outer peripheral surface of the sleeve, and the output port 25 and the feedback are provided in the first land portion and the second land portion formed on both axial sides of the circumferential groove. A port 28 may be formed, and a feedback groove extending so as to intersect the axial direction may be formed by a pair of ribs connecting the first land portion and the second land portion in the circumferential groove.

  Moreover, about the dimension and arrangement | positioning of the various ports provided in the sleeve 21, a groove part, etc., you may comprise freely according to the use environment of a spool valve, not only what is illustrated in FIGS.

  In the above-described embodiment, the normally open type spool valve in which the input port 24 and the output port 25 communicate with each other at the time of non-conduction is described as an example, but the input port 24 and the output port 25 are not connected at the time of non-conduction. You may apply to the normally closed type spool valve which does not communicate. In this case, the feedback force may work in a direction to release the communication state between the input port 24 and the output port 25.

  Further, the cross-sectional shape of the feedback groove 10 may be freely changed. For example, as shown in FIG. 10A, the U-shaped cross-sectional view (the cross-sectional viewing angle portion is a right angle) that opens in the outer diameter direction of the land portion 21d, the first circumferential groove 21b, and the second circumferential groove 21c. It may be a feedback groove 100 </ b> A having a U-shape (a configuration applied to Examples 1 to 5). Further, as shown in FIG. 10B, it may be a feedback groove 100B having a U shape in a sectional view. Further, as shown in FIG. 10C, it may be a feedback groove 100C having a V-shaped cross-sectional view.

  Further, as shown in FIG. 10 (d), a first groove portion 111 having a U-shape in cross section and continuously extending from the first circumferential groove 21b to the second circumferential groove 21c, and a land portion 21d (first groove portion). The feedback groove 100 </ b> D may be formed by the second groove portion 112 formed on the outer diameter side of the first groove portion 111 and having a U-shaped cross-sectional view wider than the first groove portion 111.

  Further, as shown in FIG. 10 (e), a first U-shaped cross-sectional view (a U-shape with a right-angle cross-sectional view) extending continuously from the first circumferential groove 21b to the second circumferential groove 21c. The groove 113 and the second groove formed on the land 21d (the outer diameter side of the first groove 113) and having a U-shape in cross-sectional view that is wider than the first groove 113 (a U-shape in which the cross-sectional angle is a right angle). 114, and a feedback groove 100E formed by

  In addition, in the form shown in FIG.10 (d) and FIG.10 (e), the 1st groove part and the 2nd groove part may be formed in the different cross-sectional shape.

DESCRIPTION OF SYMBOLS 1 Spool valve 2 Valve part 3 Solenoid part 4 Plunger 5 Rod 8 Valve housing 8a Mounting hole 10 Feedback groove 21 Sleeve 21b First circumferential groove 21c Second circumferential groove 21d Land part 22 Spool 24 Input port 25 Output port 28 Feedback port 102 to 105 Feedback groove 210 Sleeve

Claims (7)

A spool is movably disposed in a longitudinal direction inside a sleeve formed with an input port, an output port, and a feedback port, and the output port and the feedback port communicate with each other in a state of being mounted in a mounting hole of the housing. A spool valve,
A spool valve, wherein a feedback groove that forms at least a part of a spiral that communicates the output port and the feedback port is formed on an outer periphery of the sleeve. The output port is disposed in a first circumferential groove formed on the outer periphery of the sleeve;
The feedback port is disposed in a second circumferential groove formed on the outer periphery of the sleeve;
2. The spool valve according to claim 1, wherein the first circumferential groove and the second circumferential groove communicate with each other through the feedback groove.   The spool valve according to claim 2, wherein the feedback groove extends continuously in the first circumferential groove and in the second circumferential groove.   The spool valve according to any one of claims 1 to 3, wherein the feedback groove is disposed over 180 degrees or more and less than 450 degrees of the sleeve.   5. The input port according to claim 1, wherein the input port is provided between the output port and the feedback port, and the feedback groove is disposed so as to avoid the input port. The described spool valve.   6. The spool valve according to claim 5, wherein the input port and the feedback groove are disposed at positions facing each other with the shaft of the sleeve in between in a radial direction.   The spool valve according to any one of claims 1 to 6, wherein the feedback groove forms a straight line in a state in which the sleeve is cut along the axial direction and developed in a plane.

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