JP2022092799A - Control valve - Google Patents

Abstract

To provide a control valve in which an annular filter covering a port of a sleeve part storing a spool is simply mounted and a good mounted state is maintained after mounted.SOLUTION: A control valve includes a spool, a sleeve part 2 storing the spool movably along a spool axis X direction, and having a supply port 2p penetrating therethrough in the radial direction perpendicular to the spool axis X direction, and a filter 10 mounted on at a position covering the outer periphery of the supply port 2p on the outer peripheral face of the sleeve part 2, the filter 10 including an annular and elastically deformable band body 11 pressed on the outer peripheral face of the sleeve part 2.SELECTED DRAWING: Figure 2

Description

The present invention relates to a control valve.

For example, in a working machine that uses the lubricating oil stored in the mission case or the lubricating oil stored in the oil pan of the engine as the hydraulic oil, the hydraulic oil containing dust may be supplied to the control valve. there were.

In the control valve having a spool for controlling the hydraulic oil, in order to prevent the inconvenience of dust entering the control valve and to ensure the proper operation of the spool, it is supplied as shown in Patent Documents 1 and 2 described below. Those with a filter at the external position of the port are considered.

Patent Document 1 describes a plurality of techniques for winding a filter member around an oil supply port and an advance angle port of a cylindrical valve sleeve of a spool portion of a solenoid valve, and fixing the end portion of the wound filter in this way. Is described.

That is, a technique of projecting a stud on the outer periphery of the spool portion and inserting the stud into engagement holes formed at both ends of the thin plate-shaped filter to support the filter on the outer periphery of the spool portion, or a thin plate-shaped filter. The filter is wound around the spool part, and the ends are overlapped and bonded with an adhesive, the technique of joining by spot welding, or the fitting fitting means formed at the end of the thin plate-shaped filter to engage the filter. The technique is described.

Further, Patent Document 2 has a structure in which an annular filter member is arranged in a wound state at a position covering a port of a sleeve accommodating a spool of a solenoid valve, and engaging portions formed at both ends of the filter member are fitted. , A configuration forming a structure of an engaging projection that engages the sleeve is described.

Japanese Unexamined Patent Publication No. 2006-22816 Japanese Unexamined Patent Publication No. 2019-11779

Considering a configuration in which a thin plate-shaped filter is wound around a position that covers a port of a sleeve portion of a control valve, it is necessary to consider deterioration of the adhesive when both ends of the filter are welded as described in Patent Document 1. If both ends are welded, not only equipment for welding is required, but also the filter may be thermally deformed during welding, and the process of removing protrusions generated during welding by polishing, etc. It was what I needed.

Further, in the configuration in which the engaging portions are formed at both ends of the filter as described in Patent Documents 1 and 2, not only the engaging portions are required to have high accuracy, but also when the filter is mounted, the engaging portions are required. It was necessary to confirm this engaged state.

For this reason, there is a demand for a control valve that can easily mount an annular filter that covers the port of the sleeve portion that houses the spool and maintain a good mounting state after mounting.

The characteristic configuration of the control valve according to the present invention is a sleeve portion having a spool and a supply port that movably accommodates the spool along the spool axis direction and penetrates in the radial direction orthogonal to the spool axis direction. And a filter attached to a position of the outer peripheral surface of the sleeve portion so as to cover the supply port, and the filter includes an annular and elastically deformable band body that presses against the outer peripheral surface of the sleeve portion. It is in the point of being.

According to this feature configuration, by attaching the filter to the outer peripheral surface of the sleeve portion at a position covering the supply port and providing the band body on the outer surface of the filter, the state of pressing the filter against the outer peripheral surface of the sleeve portion can be maintained. Further, in this configuration, for example, even in a situation where the coefficient of thermal expansion of the sleeve portion and the filter are different and the positional relationship between both ends of the filter changes in the circumferential direction as in the case where the temperature of the fluid rises. The spool is brought into close contact with the sleeve portion, and no gap is created between them.
Therefore, a control valve is configured in which an annular filter that covers the port of the sleeve portion that accommodates the spool portion is easily mounted, and a good mounting state is maintained after mounting.

As a configuration added to the above configuration, the band body is arranged at two locations at both ends in the width direction along the spool axis of the filter, and the band body arranged at the two locations is connected so as to be connected. A crosslinked body formed in a posture parallel to the spool shaft core may be provided.

According to this, when the band bodies are arranged at two points at both ends in the width direction of the filter, these are connected by a crosslinked body, so that the movement of the two band bodies is suppressed and the filtration surface of the filter is suppressed. There is no inconvenience of overlapping bands.

As a configuration added to the above configuration, an engaging portion that holds the band body and the sleeve portion at an appropriate position by engagement may be formed between the band body and the sleeve portion.

According to this, for example, when the band body is arranged at two places which are both ends in the width direction of the filter, the movement of the band body is suppressed by engaging the band body and the sleeve portion at the engaging portion. However, there is no inconvenience in the position where the band body overlaps with the filtration surface of the filter.

As a configuration added to the above configuration, the engaging portion may be composed of an engaging body integrally formed with the band body and an engaging concave portion formed concavely on the outer surface of the sleeve portion.

According to this, the position of the belt body with respect to the sleeve portion can be fixed by engaging the engaging body of the band body with the engaging recess on the outer surface of the sleeve portion.

It is sectional drawing of a control valve. It is a side view which shows a filter and a band body. It is a perspective view of a filter and a band body. It is an enlarged sectional view of a filter and a band body. It is an enlarged sectional view of the filter and the band body of another embodiment (a). It is a side view of the filter and a band body of another embodiment (c). It is an enlarged sectional view of the filter and the band body of another embodiment (e).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIG. 1, the spool 1 and the sleeve portion 2 that movably accommodates the spool 1 along the spool shaft core X, and the compression coil type that urges the spool 1 in the direction along the spool shaft core X. The control valve V includes a spring 3 and an electromagnetic solenoid 4 that operates the spool 1 against the urging force of the spring 3.

The control valve V is provided in a block portion 5 such as a mission case or an engine of a work vehicle traveling by a driving force of an engine (not shown). In this embodiment, the sleeve portion 2 is housed in the block portion 5, and the electromagnetic solenoid 4 is provided in the block portion 5 in a state where the electromagnetic solenoid 4 is arranged outside the block portion 5. The block portion 5 discharges the main flow path 6 in which the hydraulic oil as a fluid is supplied in a pressurized state, the control flow path 7 through which the hydraulic oil controlled by the control valve V flows, and the hydraulic oil from the control valve V. It has a drain flow path 8.

The hydraulic oil is assumed to be the lubricating oil stored in the mission case or the lubricating oil stored in the oil pan of the engine, and these lubricating oils are mainstream by the oil pump (not shown). It is supplied to the road 6.

[Structure of each part of control valve]
In the spool 1, a hydraulic oil supply portion 1a is formed between a pair of land portions, and a drain hole 1b is formed on a coaxial core with the spool shaft core X. The sleeve portion 2 is formed into a cylindrical shape as a whole by forming a spool accommodating space 2s accommodating the spool 1 in a coaxial core with the spool shaft core X, and the spool accommodating space 2s is formed on the outer end side (in FIG. 1). The left end) communicates with the drain flow path 8 of the block portion 5.

The sleeve portion 2 has a plurality of pump ports 2p (an example of a supply port) that penetrate the sleeve portion 2 in the radial direction so as to connect the outside and the spool accommodation space 2s, and a plurality of controls that penetrate the sleeve portion 2 in the radial direction. A port 2c is formed. The control valve V is provided with a filter 10 on the outer periphery of the pump port 2p, and the pump port 2p and the main flow path 6 communicate with each other, and the control flow path 7 and the control port 2c communicate with each other through the filter 10. (Details of the filter 10 will be described later).

The electromagnetic solenoid 4 includes an operation rod 4a that abuts on the end of the spool 1, a movable core 4b connected to the operation rod 4a, a solenoid 4c arranged in an area surrounding the movable core 4b, and a housing 4d that houses them. And have.

The control valve V shown in FIG. 1 represents a state in which a current is supplied to the solenoid 4c of the electromagnetic solenoid 4 and the spool 1 is in the supply position. In this supply position, the hydraulic oil supplied to the pump port 2p flows to the control port 2c via the hydraulic oil supply unit 1a of the spool 1, and is supplied from the control port 2c to the control flow path 7.

The control valve V is used for controlling an actuator or the like that operates by switching between supply and discharge of hydraulic oil, such as supplying and discharging hydraulic oil for controlling a hydraulic clutch.

〔filter〕
As described above, when the lubricating oil of the mission case or the lubricating oil of the engine is used as the hydraulic oil, the hydraulic oil contains particulate foreign matter, and in order to remove the foreign matter, the sleeve portion 2 is used. A filter 10 is provided in a region surrounding the outer periphery of the portion where the pump port 2p is formed.

As shown in FIGS. 1 to 4, the width of the filter 10 (dimensions in the directions along the spool shaft core X in FIGS. 1 and 2) in the portion of the outer circumference of the sleeve portion 2 where the pump port 2p is formed. The small diameter portion 2d is formed in a slightly larger region. The filter 10 is fitted into the small diameter portion 2d to regulate the displacement in the direction along the spool shaft core X.

The filter 10 has a network shape made of a strip-shaped or linear stainless steel material having a large number of fine through holes formed in a thin plate material such as a stainless steel material, and the filter 10 is wound around the outer periphery of the small diameter portion 2d described above. The filter 10 is arranged and attached, and is provided with a pair of band bodies 11 that prevent the filter 10 from floating from the outer peripheral surface of the small diameter portion 2d in a state of being pressed against the outer surface of the filter 10.

In particular, the filter 10 is set to a length in which the ends in the longitudinal direction (circumferential direction) overlap each other in a state of being wound around the outer peripheral surface of the small diameter portion 2d. The band body 11 is formed by using a material such as an annular and elastically deformable rubber material, and the inner diameter of the annular portion is slightly smaller than the outer diameter of the small diameter portion 2d in a natural state (a state in which no external force acts). Is used.

The cross-sectional shape of each band 11 is circular as shown in FIG. 4, and as shown in FIGS. 2 and 3, a plurality of (four in the embodiment) crosslinked bodies having a posture parallel to the spool shaft core X. It is connected by 12. By providing the crosslinked body 12, the pair of band bodies 11 are held at the end positions of the filter 10 in the width direction, and the band bodies 11 are held at positions that do not overlap the filtration surface of the filter 10.

In this embodiment, the pair of band bodies 11 and the plurality of crosslinked bodies 12 are integrally formed of a material that can be elastically deformed, such as a rubber material, but the present invention is not limited to this, and for example, the crosslinked body 12 The rigidity may be higher than that of the band body 11.

[Action and effect of the embodiment]
As a result, the filter 10 can be easily attached, and the band body 11 maintains a good attached state after the attachment. Further, as compared with the case where the band-shaped filter 10 is simply wound around the outer periphery of the sleeve portion 2, the inconvenience that the filter 10 floats from the outer periphery of the sleeve portion 2 because the band body 11 is attached (in the embodiment, a small diameter). It is possible to maintain good filtration performance without deteriorating the filtration performance by the filter 10 by suppressing the inconvenience of floating from the portion 2d).

Further, since the pair of band bodies 11 are connected by a plurality of crosslinked bodies 12, the two band bodies 11 move in the width direction of the filter 10 (direction along the spool shaft core X) and reach the filtration surface. It is possible to prevent overlapping inconveniences and maintain high filtration performance.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiments (those having the same functions as those of the embodiments are designated by the same numbers and reference numerals as those of the embodiments). Further, the band body 11 of the following another embodiment is assumed to be made of a material such as an elastically deformable rubber material.

(A) The cross-sectional shape of the band body 11 is formed into a shape having a surface in close contact with the outer peripheral surface of the sleeve portion 2, such as a rectangle such as a square shown in FIG. 5 or a triangle. By molding in this way, the surface where the band body 11 and the filter 10 come into contact with each other can be enlarged to suppress the displacement of the band body 11 and hold it at an appropriate position.

(B) The number of the crosslinked bodies 12 may be one or two. Further, when the two cross-linking bodies 12 are provided, the positions of the two cross-linking bodies 12 face each other across the spool shaft core X (positions facing each other in the diameter direction) in the direction along the spool shaft core X. It is desirable to determine the positional relationship so as to avoid it. By determining the positional relationship between the two crosslinked bodies 12 in this way, for example, even if the two pump ports 2p (supply ports) are arranged in a symmetrical positional relationship with the spool shaft core X in between, the two pump ports 2p (supply port) are arranged in a symmetrical position. The crosslinked body 12 does not cause the inconvenience of hindering the flow of the hydraulic oil (fluid) at the same time.

The number of the cross-linked bodies 12 may be 3 or more, and the spacing in each circumferential direction (or the angle of the adjacent cross-linked bodies 12 with respect to the spool shaft core X in the direction along the spool shaft core X) is determined. It does not have to be a value.

(C) As shown in FIG. 6, the engaging body 11t is integrally formed with the band body 11, and the engaging body 11t is fitted into the engaging recess 2t on the outer surface of the sleeve portion 2. In this configuration, the engaging portion L is composed of the engaging body 11t and the engaging recess 2t.

In this other embodiment (c), the engaging body 11t is formed in a dovetail shape that is wider as it is separated from the band body 11 in a direction orthogonal to the spool shaft core X, and the engaging body 11t is fitted into the engaging body 11t. The joint recess 2t is also formed into a shape corresponding to the dovetail shape.

By providing such an engaging portion L, the band body 11 can be held at a fixed position with respect to the sleeve portion 2, and the band body 11 moves to the center side in the width direction of the filtration surface of the filter 10. Can also be resolved. It is assumed that the engaging portions L are formed at a plurality of locations of one band body 11, but the number of engaging portions L is not particularly limited, and is, for example, one location. Is also good. Further, the crosslinked body 12 may be provided between the pair of band bodies 11 having the configuration of the other embodiment (c), and in the configuration provided with the crosslinked body 12 as described above, only one of the pair of band bodies 11 may be provided. The engaging portion L may be formed.

(D) The engaging portion L is not limited to the configuration shown in the separate embodiment (c), and is, for example, outside the outer end of the filter 10 in the direction along the spool shaft core X in the band body 11. A pin-shaped engaging body 11t protruding in the direction of the spool shaft core X is formed at a position orthogonal to the spool shaft core X, and is located on the outer surface of the sleeve portion 2 at a position corresponding to the pin-shaped engaging body 11t. It is also conceivable to form an engaging recess 2t into which the engaging body 11t is fitted. In this case, the cross-sectional shapes of the engaging body 11 and the engaging portion 11t are not particularly limited, and may be, for example, a circle, an ellipse, a triangle, a rectangle, or the like. Further, the engaging body 11 and the engaging portion 11t may be provided in one or a plurality in each band body 11, and the cross-linking body 12 is provided between the pair of band bodies 11 and only one of the pair of band bodies 11 is provided. The engaging body 11 may be formed, and the engaging recess 2t may be formed at a position corresponding to the engaging portion 11 on the outer surface of the sleeve portion 2.

(E) As shown in FIG. 7, the band body 11 abuts on the outer peripheral surface of the crimping portion 11a that crimps the band body 11 to the outer peripheral surface near the end portion in the width direction of the filter 10 and the small diameter portion 2d of the sleeve portion 2. It is composed of a contact portion 11b and a plurality of pin-shaped engaging bodies 11t protruding inward in the radial direction from the contact portion 11b, and is engaged with a portion of the small diameter portion 2d of the sleeve portion 2 corresponding to the engaging body 11t. It forms an engaging recess 2t into which the coalesced 11t fits.

In this other embodiment (e), the engaging portion L is formed by the engaging body 11t and the engaging recess 2t, and the contact portion 11b of the band body 11 is positioned with respect to the sleeve portion 2 by the engaging portion L. The crimping portion 11a of the band body 11 is crimped to the outer peripheral surface of the filter 10 to realize the position holding of the filter 10.

(F) A filter 10 is used which has been previously held in a cylindrical shape by a technique such as roll molding so that the state of being wound around the outer periphery of the sleeve portion 2 can be maintained by elastic deformation. With such a configuration, it is possible to prevent the inconvenience that the filter 10 floats from the outer surface of the sleeve portion 2 and maintain good filter performance.

The present invention can be used for a control valve having a supply port formed in a sleeve portion accommodating a spool.

1 Spool 2 Sleeve 2t Engagement recess 2p Pump port (supply port)
10 Filter 11 Band body 11t Engagement body 12 Cross-linking body L Engagement part X Spool shaft core

Claims (4)

With spool
A sleeve portion that accommodates the spool so as to be movable along the spool axis direction and has a supply port that penetrates in the radial direction orthogonal to the spool axis direction.
A filter attached to a position covering the supply port on the outer peripheral surface of the sleeve portion is provided.
A control valve having an annular and elastically deformable band body in which the filter presses against the outer peripheral surface of the sleeve portion. The band body is arranged at two positions at both ends in the width direction along the spool axis of the filter.
The control valve according to claim 1, further comprising a crosslinked body formed in a posture parallel to the spool shaft core so as to connect the band bodies arranged at two locations. The control valve according to claim 1 or 2, wherein an engaging portion that holds the band body and the sleeve portion in an appropriate position by engagement is formed between the band body and the sleeve portion. The control valve according to claim 3, wherein the engaging portion is composed of an engaging body integrally formed with the band body and an engaging concave portion formed concavely on the outer surface of the sleeve portion.

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