JP2000266235A - Control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent foreign matter in operating fluid from entering into a valve by providing a circumferential groove connected to a port part in the outer circumferential part in the axial position and having the port part of a valve sleeve opened, forming a clearance to be a channel of the control fluid in the circumferential groove, and holding a filter member. SOLUTION: An annular groove 6 as a circumferential groove whose groove bottom 6a reaches the intermediate position of the circumferential wall of a valve sleeve 4 is provided in a port. A filter member 5 is wound around the groove bottom 6a of the annular groove 6 and engagement holes in the both ends are engaged with studs 7 in order. This constitution can position the filter member 5 between an inner cylinder part 4s of the valve sleeve 4 and the outer circumference to form a clearance 8 to be an oil channel toward the outer circumference. The valve sleeve 4 of the solenoid valve can be thus provided with the filter member 5 so that the foreign matter mixed in oil passing through the port part can be caught by the filter member 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve and, more particularly, to a technique for mounting a filter member for suppressing the influence of foreign substances mixed in a control fluid on the control valve.

[0002]

2. Description of the Related Art A solenoid valve 101 for hydraulic control as this type of fluid pressure control valve in the prior art.
Is shown in FIG. The solenoid valve 101 is incorporated in a control port section 120 of a device in which a spool section 102 controls the flow and pressure of a control fluid (oil), and a cross-sectional configuration in this state is shown in FIG.

[0003] Devices to be controlled can be used, for example, for controlling the valve timing of an intake or exhaust valve of an automobile engine to be advanced or retarded by hydraulic pressure in accordance with the rotational state of the engine, running load conditions, and the like. is there.

[0004] The solenoid valve 101 has a spool 1
02 and a solenoid 103 controlling the spool 102
It is roughly constituted from. The spool unit 102 includes a cylindrical valve sleeve 104 and a spool 105 slidably provided on the inner cylinder of the valve sleeve 104.
05 is urged by a spring 106 in the right-hand direction in the figure.

[0005] The valve sleeve 104 is formed with five grooves each of which communicates with the inner cylindrical portion of the valve sleeve 104.
b, oil supply port 104c, retard port 104d,
It is used as a retard drain port 104e.

The spool 105 has an outer peripheral groove 10 serving as a flow path.
5a, 105b, and 105c are formed, and the oil is controlled by the axial positional relationship between each port and each outer circumferential groove, which changes as the spool 105 is controlled to move in the axial direction by the solenoid unit 103. Will be.

FIG. 25 is a diagram for explaining an operation state of control by the solenoid valve 101. As shown in FIG. FIG. 25 (a)
Indicates that the solenoid 103 is not energized (the spool 105
Is located near the zero stroke), the oil flows from the oil supply port 104c to the retard port 104d, and is discharged from the advance port 104b to the advance drain port 104a.

FIG. 25B shows a state in which the spool 105 is located near the neutral position in the middle of the stroke), and no oil flows from the oil supply port 104c to any of the advance port 104b and the retard port 104d. .

FIG. 25C shows a state in which the spool 105 is located near the full stroke, oil flows from the oil supply port 104c to the advance port 104b, and the oil flows from the retard port 104d to the retard drain port 104d.
e.

Therefore, the magnitude of the current supplied to the solenoid unit 103 or the spool 1 related to the magnitude of the current
05 according to the stroke position of the oil supply port 10
4c, the advance port 104b, and the retard port 104d are controlled so as to be in an appropriate pressure state.

[0011]

In such a solenoid valve 101, there are a plurality of paths for guiding the oil introduced from the oil supply port 104c to the device to be controlled, and the oil from the control device side also has a solenoid valve. 1
No. 01 and a plurality of ports.

However, if foreign matter or the like is mixed in the control fluid oil due to aging, the solenoid valve 101
For example, a filter is provided in the middle of the path to the oil supply port 104c to remove foreign substances because there is a concern that the stable operation of the oil supply port may be impaired.

However, in such a configuration in which a filter is provided in a specific path and foreign matter mixed in oil passing therethrough is removed, when there are a plurality of paths, foreign matter mixed in oil passing through other paths is used. Is difficult to remove.

It is also conceivable to install a filter on a member on the other side where the solenoid valve 101 is mounted. However, the structure of the member on the other side must be changed, which causes problems such as a change in the layout of components and an increase in space. I will.

When installing a filter, it may not be possible to provide a new space for installing a filter depending on the equipment on the installation side, and it is necessary to suppress a decrease in the oil passage area due to a plurality of filters. Furthermore, restrictions on cost and simplicity of the mounting method are required, which is a condition with many restrictions.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to prevent foreign matters of a working fluid which may impair the stability of valve operation from entering the valve. It is to provide a control valve provided with a filter.

[0017]

According to the present invention, there is provided a control valve having a valve sleeve provided with a port through which a control fluid passes through a peripheral wall. A circumferential groove is provided from an outer peripheral portion at an axial position where the port portion of the valve sleeve is open to an intermediate position in the radial direction of the peripheral wall portion, and is disposed in the circumferential groove connected to the port portion; A filter member having a thickness smaller than the groove depth of the direction groove, and holding means for forming a gap that becomes a flow path of a control fluid along the filter region and holding the filter member in the circumferential groove, It is characterized by having.

With such a configuration, the filter member can be provided on the valve sleeve of the control valve, and the filter member can be provided outside the control valve without changing the configuration of the device on which the control valve is mounted. Without providing the filter member, foreign matters and the like mixed in the control fluid passing through the port portion can be captured by the filter member, and the operation stability of the control valve can be improved.

In particular, the present invention is applied to each port portion of a valve sleeve of a spool valve provided with a plurality of port portions arranged in the axial direction, whereby a flow path connected to each port portion is independently controlled. Even in the configuration in which the fluid flows, the filter member is provided for each flow path, so that it is possible to expect improvement in operation stability of the entire device to which the control valve is attached, and the filter member is independently provided. This makes it possible to make the configuration of the device more compact and simpler.

Further, according to the filter member of the control valve and the mounting structure of the filter member, the filter member is disposed in the circumferential groove with a gap serving as a flow path for the control fluid. The filter member does not directly contact the flow path on the device side to be attached, so that the flow path area of the flow path on the device side is not reduced, and the control fluid that has passed through the filter member is flush with the outer peripheral portion of the valve sleeve. Since the filter member, and also flows through the gap between the groove bottom of the circumferential groove and the filter member, it is possible to greatly utilize the filter area,
There is no danger of causing a decrease in the flow rate.

A radius is provided at the boundary between the groove bottom and the side end surface of the circumferential groove, a number of slits are formed in the axial end surface of the filter member, and the rigidity of the axial end surface is reduced by the slits. It is also preferable that a contact can be made by following the radius portion.

According to this configuration, it is possible to prevent a gap between the axial end face of the filter member and the end face of the circumferential groove, to suppress the passage of foreign matter and the like, and to securely insert the filter member into the circumferential groove. It can be arranged so that it does not move.

Preferably, the holding means includes a frame for holding the filter member in a substantially annular or arc shape following the circumferential groove.

By the frame, the shape of the filter member is held in a substantially annular or arcuate shape. Once the filter member is inserted into the circumferential groove, it does not come off, and the filter member can be easily held.

It is also preferable that the holding means includes a detent means for restricting rotation of the filter member with respect to the circumferential groove.

[0026] With this, the mounting position of the filter member with respect to the port portion can be fixed, and wear due to the rotation of the filter member and a change in the flow rate of the filter can be suppressed. Perform capture.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. The control valve to which the present invention is applied has the same configuration as the control valve except for the characteristic configuration of the solenoid valve described with reference to FIGS. 24 and 25 in the related art section, the filter member described below, and the mounting portion thereof. And the same control operation can be performed on the control fluid.

Therefore, in this embodiment, the description will be made with emphasis on the characteristic configuration related to the invention, and the description of the general configuration and operation of the control valve itself will be omitted. still,
The control valve is not limited to a solenoid valve, and can be similarly applied to a normal valve in which drive control by the solenoid is not performed or another type of drive control valve. Further, the type of control valve to be applied is not limited to the spool type, but can be applied to other types such as a butterfly valve and a poppet valve.

(Embodiment 1) FIGS. 1 to 4 are views showing a solenoid valve 1 as a control valve according to a first embodiment. 1 is an external view of the solenoid valve 1 in a filter mounted state, FIG. 2 (a) is an enlarged sectional view of a portion D1 in FIG. 1, and FIG. 2 (b) is a sectional view taken along line S1-S1 in FIG. 2 (a). FIG. FIG. 3 is an explanatory view of the filter member, and FIG. 4 is an explanatory view of holding means for holding the filter member.

1 and 2, a solenoid valve 1 is a solenoid valve for hydraulic control as a control valve for controlling a fluid pressure, and a spool unit 2 controls a flow and a pressure of a control fluid (for example, oil). It is incorporated in the control port section 120 (see FIG. 24) of the device.

The control target device can be used for, for example, a device that performs control to advance or retard the valve timing of an intake or exhaust valve of an automobile engine by hydraulic pressure in accordance with the rotation state of the engine, running load conditions, and the like. is there.

The solenoid valve 1 is generally constituted by a spool 2 and a solenoid 3 for controlling the spool 2. The spool portion 2 includes a cylindrical valve sleeve 4 and a spool (not shown) slidably provided on the inner cylindrical portion 4s of the valve sleeve 4.

The valve sleeve 4 has five port portions of an advanced drain port 4a, an advanced port 4b, an oil supply port 4c, a retard port 4d, and a retard drain port 4e through which oil (control fluid) passes. It is arranged so that it may line up in the direction.

Each port is provided so as to penetrate the peripheral wall of the valve sleeve 4. In the axial direction of the valve sleeve 4, a part in the circumferential direction is left as an axial connection part 4f, and the remaining part is left. It is configured as an annular groove 4h that becomes an opening 4g that is expanded in the circumferential direction.

The oil supply port 4c will be described as an example of the port where the filter member 5 is disposed (the port can be disposed at any port). If the groove width of the annular groove 4h on the outer peripheral side of the valve sleeve 4 is set in the axial direction, While expanding, groove bottom 6
The annular groove 6 as a circumferential groove is formed so that a reaches a middle position of the peripheral wall portion of the valve sleeve 4 (specific example of this embodiment is 40% of 2 mm in depth, 5 mm in width and 5 mm in thickness of the peripheral wall portion). Is provided.

The groove bottom 6a is formed by a side end face 6b of the annular groove 6 and an end face (annular groove 4h) of the port (oil supply port 4c).
Are connected to each other.

A stud 7 functioning as a holding means for the filter member 5 is fixed to the axial connection portion 4f by screwing.

FIG. 3 is an expanded view of the filter member 5. The cross-hatched area is a filter area 5a in which a number of small holes are formed. The filter member 5
It is a thin rolled plate in which fine holes are formed by pattern etching. At both ends, a chrysanthemum washer-like engaging hole 5b that engages with the stud 7 is provided.

FIG. 4 shows the shape of the stud 7 (FIG. 4A).
FIGS. 4A and 4B show a method of fixing an engagement hole 5b at the end of the filter 5 to the stud 7 (FIGS. 4B and 4C).

The stud 7 comprises a main body 7a having an external thread formed on the outer periphery, a neck 7b having a smaller diameter than the main body 7a, and a head 7c having a larger diameter than the neck 7b. As shown in FIG. 2, the main body 7a is screwed and fixed to a female screw provided in the axial connection portion 4f.

The filter member 5 includes a groove bottom 6a of the annular groove 6.
And the engagement holes 5b at both ends are sequentially engaged with the stud 7. At the time of engagement, since the inner diameter of the projection of the engagement hole 5b is set slightly larger than the outer diameter of the head 7c, the projection flexes as shown in FIG. Then, as shown in FIG. 4C, it fits in the neck 7b.

In mounting the filter member 5, the filter member 5 is wound around the groove bottom 6a of the annular groove 6 (a slight gap is allowed), so that the filter member 5 is located between the inner cylindrical portion 4s of the valve sleeve 4 and the outer peripheral portion. And a gap 8 serving as a flow path for oil is formed between the outer peripheral portion and the outer peripheral portion.

With this configuration, the filter member 5 can be provided on the valve sleeve 4 of the solenoid valve 1 without changing the configuration of the device on which the solenoid valve 1 is mounted, and without changing the configuration of the solenoid valve 1. Without providing the filter member 5 outside, foreign matter and the like mixed in the oil passing through the port portion can be removed.
Thus, the operation stability of the solenoid valve 1 can be improved.

In particular, the present invention is applied to each of the port portions of the valve sleeve 4 of the spool valve provided with a plurality of port portions arranged in the axial direction as in this embodiment, thereby connecting to each port portion. Even in a configuration in which the flow path on the device side that allows the oil to flow independently is provided with a filter member for each flow channel, it is expected that the operation stability of the entire device to which the solenoid valve 1 is attached is improved. It becomes possible, and the configuration of the device can be made compact and simpler than when the filter member 5 is independently provided.

Further, according to the filter member 5 of the solenoid valve 1 and the mounting structure of the filter member 5, the filter member 5 is arranged so as to have a gap 8 from the outer peripheral portion of the valve sleeve 4 as an oil flow path. Therefore, the filter member does not directly contact the flow path on the device side to which the solenoid valve 1 is attached, so that the flow path area of the flow path on the device side is not reduced, and the oil that has passed through the filter member 5 Since the gas flows through the gap 8 to the flow path on the device side, there is no possibility that the flow rate is reduced. Note that the annular groove 6 in which the filter member 5 is disposed may not be annular but may be a circumferential groove (a fan-shaped cross section in the axial direction). In this case, the filter member is also annular. (For example, approximately C
It is necessary to fix the filter member by a connecting means such as a bonding step or spot welding described later, or a frame, so that the filter member follows the circumferential groove.

Since the port portion and the annular groove 6 are annular as in this embodiment, the area of the valve opening of the port portion can be set large, and the filtration area of the filter member 5 can be reduced. The filter member can be set large, and the filter member can be easily held.

That is, it is easy to set the valve opening area of the port portion larger than the flow path area of the device side to which the solenoid valve 1 is mounted. The flow path area of the port portion represented by the product of the opening ratios is allowed to have a margin, and it is easy to set a flow rate loss, a pressure loss, and the like due to the interposition of the filter member 5 so as not to affect the function of the solenoid valve 5. Become.

(Embodiment 2) In the second embodiment,
Another configuration of the holding means of the filter member will be described.
In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 (a) corresponds to FIG. 2 (b) and is an explanatory view of a cross-sectional structure at a position where the filter member is wound. FIG. 5 (b) is a cross-sectional view of S2 in FIG. 5 (a). is there. FIG.
, The stud 7 is not provided in the axial connection portion 4f, and both ends of the filter member 5A are fixed by bonding the overlapping portion 5A1 (adhesive layer 5A2) to make the filter member 5A annular. I have.

The adhesive used for the adhesive layer 5A2 includes
It is possible to use an oil- and heat-resistant material such as an epoxy-based adhesive.

(Embodiment 3) In the third embodiment,
A description will be given of a case where both end portions of the filter member 5B are fixed by spot welding. FIG. 6A corresponds to FIG. 2B, and is a cross-sectional configuration explanatory view of a position where the filter member is wound, and FIG. 6B is an enlarged view of a portion D3 in FIG. FIG. 6C is an external view of a state in which the filter member 5B is attached, and FIG. 6D is a cross-sectional view of S3 in FIG. 6A.

The filter member 5B is provided with a groove bottom 6 of the annular groove 6.
Since the vicinity of the axial end face portion 5B1 is located on the position a, spot welding is performed by pressing the spot welding electrode 11 against both axial ends of the overlapping portion shown in FIG. 6C.

Numeral 12 denotes welding marks. In FIG. 6, only the both ends of the filter member 5B are joined, but the filter member 5B and the valve sleeve 6 are fixed to each other by welding up to the groove bottom 6a to stop the filter. Is also possible.

(Embodiment 4) In the fourth embodiment,
A pedestal portion 4f1 is provided at the axial connection portion 4f so that the filter member 5C can be held by one spot welding.

FIG. 7 (a) corresponds to FIG. 2 (b) and is a cross-sectional configuration explanatory view of a position where the filter member is wound. FIG. 7 (b) is an external view of a state where the filter member 5B is mounted. FIG. 7C and FIG. 7D show D in FIG.
It is the figure which expanded four parts.

A pedestal portion 4f1 is provided at the axial connection portion 4f,
The overlapping portion of the filter member 5C is located at this position, and the spot welding electrode 11 is pressed to connect the both end portions of the filter member 5C to hold the filter member 5C in an annular shape. In the spot welding, only the both ends of the filter member 5B may be joined, or the filter member 5C and the valve sleeve 6 may be fixed to each other by welding to the pedestal portion 4f1 to prevent rotation.

Since the pedestal 4f1 receives the load of the spot welding electrode 11, the deformation of the filter member 5C is suppressed,
Further, the filter member 5C can be held by one spot welding, and the manufacturability is improved.

(Embodiment 5) In the fifth embodiment,
The filter member 5D is provided with a frame 5D1 as holding means for holding the outer shape in a substantially annular or arcuate shape (in this embodiment, substantially C-shaped).

FIG. 8A is a view of the filter member 5D, and FIG. 8B is a sectional view of the filter member 5D.
(C) is a sectional view of a state where the filter member 5D is mounted in the annular groove 6.

The frame 5D1 can be obtained, for example, by insert molding with a resin (for example, nylon) having oil resistance and heat resistance together with the thin plate filter 5D2. Create a C-shaped frame 5D1 separately and insert a filter 5D2 in the groove.
Can also be obtained by a method of fitting and fixing.

The filter 5D2 is based on the frame 5D1.
Since it is held in a floating state from the groove bottom 6a and is held inside the outer peripheral surface of the valve sleeve 4, interference with the control port side (outer peripheral side) and the spool of the inner cylindrical portion of the valve sleeve 4 is prevented. be able to.

FIG. 9 is a view for explaining the shape of the filter member 5D. In FIG. 9A, the filter 5D2 is held substantially at the center of the radial thickness of the frame 5D1. An opening 5D3 and a flexible portion 5D4 having a flat inside.
The flexible portion 5D4 is deformed so that the opening 5D3
Is spread and fitted into the annular groove 6.

Filter member 5 D fitted in annular groove 6
Can fit into the annular groove 6 due to the shape return characteristic of the resin, and the flexible portion 5D4 of the filter member 5D and the flat portion on the valve sleeve side can easily function as a detent means. is there.

FIG. 9B shows a structure in which a plurality of spacer portions 5D5 projecting inside the filter 5D2 are provided, and the filter members 5D are raised above the groove bottom portions 6a by the spacer portions 5D5. By floating the filter member 5D, the filter member 5D can function as an inner flow path for the control fluid passing through the filter 5D, and the entire filtering area of the filter 5D2 (not only the area in the direction connecting the port and the opening, but also the entire periphery of the filter) Can be effectively used).

In FIG. 9C, an engagement fitting means (joint) is formed to close the opening 5D4.
By closing the opening 5D4, the filter member 5D can be more reliably held.

(Embodiment 6) In the sixth embodiment,
The relationship between the stud 7 and the engagement hole 5b of the filter member 5 described in the first embodiment will be described. In the first embodiment, as shown in FIGS. 3A and 10A,
Engagement holes 5b having the same shape are formed at both ends of the filter member 5, and one end of the stud 7 is fixed to the starting point.
(FIG. 10 (b)), and then fitted to the stud 7 with the other end fixed at the end point (FIG. 10 (c)).

However, when both ends are fixed to the stud 7 with the chrysanthemum washer-shaped engaging holes 5b, there is little play in the circumferential direction, and the work may be difficult. In consideration of this, as shown in FIG. 11A, one engagement hole 5b1 is a round hole having a diameter larger than the head 7c of the stud 7, and is easily positioned so that the other chute washer can be positioned. It is also possible to fix to the stud 7 only by the engagement hole 5b of the shape. The chrysanthemum washer-shaped engaging hole 5b covers the round engaging hole 5b1, so that the slit of the chrysanthemum washer can prevent foreign matter from passing therethrough.

FIG. 11B is a diagram showing a configuration in which one of the engagement holes of the filter member is provided with an elongated engagement hole 5b2. With such a configuration, it is possible to suppress displacement of the filter member in the width direction (axial direction of the valve sleeve).

Further, as shown in FIG. 12, the filter member may have a structure in which one of the engagement holes is provided with an engagement hole 5b3 in the form of a darma hole (see FIG. 12 (a)). . The large hole of the daruma hole can be easily passed through the stud 7 (see FIG. 12 (b)), and by fitting the small hole into the neck 7b of the stud 7, it is possible to prevent falling off during the mounting operation. (See FIG. 12C). (Embodiment 7) In the seventh embodiment, as shown in FIG. 13 (a), a radius 6c is formed at a boundary between a groove bottom 6a serving as a step portion of the annular groove 6 and an end face 6b serving as an axial end face. On the other hand, a large number of slits 5E2 are formed in the axial end face 5E1 of the filter member 5E, and the axial end face 5E1 whose rigidity is weakened by the slits 5E2 is formed into a circular groove 6c of the annular groove 6.
It is possible to abut according to.

Therefore, the width dimension of the filter member 5E is set so as to abut against the radius 6c on both sides of the annular groove 6. Further, for holding the filter member 5E, the configuration of the stud and the engagement hole described in the sixth embodiment can be adopted.

According to this configuration, the filter member 5
A gap between the axial end surface portion 5E1 of E and the end surface of the annular groove 6 can be prevented, the passage of foreign matter and the like can be further suppressed, and the filter member 5E is arranged so as not to move firmly in the annular groove 6. be able to.

FIG. 14 shows an example of the seventh embodiment, in which the outer peripheral surface of the axial connection portion 4f of the valve sleeve 4 is the groove bottom 6a 'of the annular groove 6, and the filter member 5F is attached to the groove bottom 6a'. It is held in direct contact. 5F1,
5F2 are both ends of the filter member 5F, and the groove bottom 6
It is fixed to a ′ by adhesion.

FIG. 15 shows an example of the seventh embodiment, and is an explanatory view of a configuration in which the filter member 5G is fixed by spot welding. FIG. 15A is a sectional view,
15 (b) is a side view, and FIGS. 15 (c) and 15 (d) are enlarged cross-sectional views of a portion D5 in FIG. 15 (a).

The filter member 5G is provided at the bottom 6 of the annular groove 6.
a '(the outer peripheral surface of the axial connection portion 4f) is held so as to be in direct contact with it, so that it does not dent even when subjected to the pressure at the time of spot welding, and spot welding at one central portion (weld mark 5G1) Is held in an annular shape.

The spot welding can be performed by connecting only the both ends of the filter member 5G (FIG. 15C), or by connecting the filter member 5G to the groove bottom 6 as shown in FIG.
It is also possible to join with a ′ to prevent rotation.

(Eighth Embodiment) In the eighth embodiment,
As shown in FIG. 16A, the filter member 5H has a portion 5H2 in which a large number of slits are formed in the axial end face portion 5H1 and a portion 5H in which no slits are formed on both sides thereof.
H3 and no slit 5H3
Then, the filter width is narrowed.

FIG. 16B is a sectional view of the valve sleeve to which the filter member 5H is attached, FIG. 16C is a sectional view taken along line S4-S4 of FIG. 16B, and FIG.
It is S5-S5 sectional drawing of (b).

In the portion 5H3 where no slit is formed in the axial end face, there is no interference with the end face 6b of the annular groove 6 (see FIG. 16 (c)), and it can be easily inserted into the annular groove 6. Workability is improved. In addition, the portion 5H2 in which the slit is formed is the same as that of FIG.
It is in contact with c. 5H without slit
By adhering the groove 3 to the groove bottom 6a '(the outer peripheral surface of the axial connection portion 4f), entry of foreign matter from this portion can be prevented.

FIG. 17 shows an example of the eighth embodiment. In the filter member 5I, at least one fixing hole 5I1 is formed at one end where a filter and a slit are not formed.
(Three places in this embodiment).

On the valve sleeve side, an axial connecting portion 4f
On the opposite side of the opening 4g, there is provided a projection 4f1 that fits the fixing hole 5I1, and by positioning the fixing hole 5I1 on the projection 4f1, the rotation of the filter member 5I is eliminated,
The mounting position of the filter member 5I can be stabilized. Further, the positioning in the rotation direction during the mounting operation can be easily performed, and the workability can be improved.

(Embodiment 9) In the ninth embodiment,
Various variations of the filter member having the frame will be described. The configuration of the filter and the frame is the same as the configuration described in the fifth embodiment, but includes a characteristic configuration that functions as a rotation preventing unit.

FIG. 18A is a view for explaining the shape of the filter member 5J, and FIG.
FIG. 4 is an explanatory view of a state in which is mounted on an annular groove 6.

The frame 5J1 of the filter member 5J is substantially C
The filter 5J2 has a mold shape, and a filter 5J2 is integrally formed on the inner peripheral side of the frame 5J1 by molding.

The frame 5J1 has an opening 5J3.
And two flat rib portions 5J4 formed on both sides of the opening 5J3 in the axial direction, and the filter 5J2 is slightly separated from the groove bottom 6a of the annular groove 6 in which the filter member 5J is mounted. Protrusions 5J5 and 5J6 are provided to form an inner gap 8 '(which becomes an inner flow path for the control fluid passing through the filter 5J2).

The projection 5J5 engages with the engagement projection 5J7 to hold the frame 5J1 in a closed annular shape.

On the other hand, the axial connection portion 4f is provided with a flat portion 4fa (two places) partially cut off at a position approximately 120 degrees wider than the center position of the opening 4g on the outer peripheral surface.

The filter member 5J is fitted into the annular groove 6 with the opening 5J3 widened so that the flat portion 5J4 and the flat portion 4fa formed by cutting off a part of the outer peripheral surface of the valve sleeve face each other.

Filter member 5J fitted in annular groove 6
Are the shape return characteristics of the resin, the projection 5J5 and the engagement projection 5
The rotation of the filter member 5J is restricted by the flat portion 5J4 of the filter member 5J and the flat portion 4fa of the valve sleeve, which fit in the annular groove 6 by the engagement of J7 and function as the rotation preventing means.

FIG. 19 is an explanatory view showing a state where the filter member 5K is mounted in the annular groove 6. The filter member 5K is provided with a projection 5K4 instead of the rib 5J4 of the filter member 5J, and the projection 5K4 is engaged with the flat surface 4fa on the outer peripheral surface of the axial connection portion 4f to prevent rotation. Other configurations are the same as those of the filter member 5J.

FIG. 20 shows a configuration in which a concave portion 4fb is provided on the outer peripheral surface of the axial connection portion 4f instead of the flat portion 4fa, and a filter member 5K is mounted.

FIG. 21 shows a projection 5J5 of the axial connection portion 4f.
A flat portion 4fc is provided at a position where the engagement protrusion 5J7 is located and the filter member 5K is mounted.

In FIG. 21, FIG. 21 (a) is an explanatory view of the structure of the filter member 5K, and FIG.
21 (a) is a view taken in the direction of arrows V1-V1, and FIG. 21 (c) is an explanatory view of a state where the filter member 5K is mounted in the annular groove 6. FIG.

(Embodiment 10) In the tenth embodiment, a configuration in which the mountability of a filter member having a frame is improved will be described. The axial connection portion 4f is provided with a flat portion 4fa or a concave portion 4fb on the outer peripheral surface as a detent.

In FIG. 22A, the filter member 5L
Has an arc shape in which the opening angle AG1 of the opening 5L3 of the frame 5L1 is about 120 degrees, and the frame does not exist on the tip side of the protrusion 5L4. The filter 5L2 is
At least a region wider than the opening 4g is provided.

The filter member 5L has a flat portion 4fa (see FIG. 22 (b)) or a concave portion 4fb (FIG. 22) formed by cutting off the projection 5L4 and a part of the outer peripheral surface of the valve sleeve.
(See (c)), and the opening 5L3 is widened so as to face the annular groove 6.

Filter member 5L fitted in annular groove 6
Is contained in the annular groove 6 due to the shape return characteristic of the resin, and its rotation is regulated by the projection 5L4 of the filter member 5L functioning as a rotation preventing means.

When the filter member 5L is mounted, the ratio of widening the opening 5L3 can be set smaller than that in the ninth embodiment, and the mounting becomes easy.

Further, as shown in FIG. 23, a filter member 5M having a flat portion 5M4 instead of the projecting portion can be used as the detent means.

[0099]

According to the present invention described above, by disposing the filter member at the port of the control valve, foreign matter of the working fluid is prevented from entering the valve, and the operation of the valve is prevented. It is possible to ensure stability.

Since the filter member is provided in the valve sleeve of the control valve, it is not necessary to change the configuration of the device on which the control valve is mounted, and the invention can be easily applied. Further, since it is not necessary to provide a filter member outside the control valve, the configuration of the device can be made compact and simpler than when the filter member is independently provided.

Since the control fluid passing through the filter member also flows through the gap between the circumferential groove and the filter member, the filtration area of the filter member can be effectively used, and there is no possibility that the flow rate decreases.

The axial end face of the filter member, in which a number of slits are formed, can be brought into contact with the step at the boundary between the step and the end face of the circumferential groove. A gap between the filter member and the end face of the circumferential groove can be prevented, the passage of foreign matter or the like can be suppressed, and the filter member can be arranged so as not to move firmly in the circumferential groove.

By providing a frame to the filter member,
Since the frame keeps the filter member in a substantially annular or arcuate shape, once it is fitted into the circumferential groove, it does not come off and the filter member can be easily held.

Further, by providing a rotation stopping means,
The mounting position of the filter member with respect to the port portion can be fixed, thereby suppressing abrasion due to the rotation of the filter member and a change in the flow rate of the filter, and more stably capturing foreign substances mixed in the control fluid.

[Brief description of the drawings]

FIG. 1 is an external view of a control valve in a filter mounted state.

2A is an enlarged sectional view of a portion D1 in FIG. 1, and FIG. 2B is a sectional view taken along line S1-S1 in FIG. 2A.

FIG. 3 is an explanatory diagram of a filter member.

FIG. 4 is an explanatory diagram of holding means for holding the filter member.

FIG. 5 is an explanatory view of a valve sleeve and a filter member.

FIG. 6 is an explanatory diagram of a valve sleeve and a filter member.

FIG. 7 is an explanatory view of a valve sleeve and a filter member.

FIG. 8 is an explanatory view of a filter member provided with a frame.

FIG. 9 is an explanatory view of a filter member provided with a frame.

FIG. 10 is a diagram illustrating holding means for a filter member.

FIG. 11 is a diagram illustrating a holding unit of the filter member.

FIG. 12 is a diagram illustrating a holding unit of a filter member.

FIG. 13 is a view of a filter member provided with a slit.

FIG. 14 is an explanatory view of a filter member provided with a valve sleeve and a slit.

FIG. 15 is an explanatory view of a filter member provided with a valve sleeve and a slit.

FIG. 16 is an explanatory view of a filter member provided with a valve sleeve and a slit.

FIG. 17 is an explanatory view of a filter member provided with a valve sleeve and a slit.

FIG. 18 is an explanatory diagram of a filter member including a frame.

FIG. 19 is an explanatory view of a filter member provided with a frame.

FIG. 20 is an explanatory diagram of a filter member including a frame.

FIG. 21 is an explanatory diagram of a filter member provided with a frame.

FIG. 22 is an explanatory view of a filter member provided with a frame.

FIG. 23 is an explanatory view of a filter member provided with a frame.

FIG. 24 is an explanatory sectional view of a conventional solenoid valve.

FIG. 25 is a view for explaining the operation of a conventional solenoid valve.

[Explanation of symbols]

 1 Solenoid Valve (Control Valve) 2 Spool 3 Solenoid 4 Valve Sleeve 4a Advance Drain Port 4b Advance Port 4c Oil Supply Port 4d Delay Port 4e Delay Drain Port 4f Axial Connection 4g Opening 4h Annular Groove 5 Filter member 5a Filter area 5b Engagement hole 6 Annular groove 6a Groove bottom 6b End face 7 Stud 7a Body 7b Neck 7c Head 8 Gap 120 Control port

Claims (4)

[Claims] 1. A control valve provided with a valve sleeve provided with a port through which a control fluid passes through the peripheral wall, wherein the peripheral wall is formed from an outer peripheral portion at an axial position where the port of the valve sleeve is open. A circumferential groove provided to an intermediate position in the radial direction of the portion and connected to the port portion; a filter member disposed in the circumferential groove and having a thickness smaller than a groove depth of the circumferential groove; And a holding means for forming a gap serving as a control fluid flow path along the filter region and holding the gap in the circumferential groove. 2. A radius is provided at a boundary between a groove bottom portion and a side end surface of the circumferential groove, and a large number of slits are formed in an axial end surface portion of the filter member, and the rigidity of the axial direction is reduced by the slits. 2. The control valve according to claim 1, wherein an end face portion can be brought into contact with the radius portion so as to follow the radius portion. 3. 3. The control valve according to claim 1, wherein the holding unit includes a frame that holds the filter member in a substantially annular or arc shape following the circumferential groove. 4. The control valve according to claim 1, wherein the holding unit includes a detent unit that restricts rotation of the filter member with respect to the circumferential groove.