JPH0958498A - Hydraulic control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress effectively the generation of a self-excited vibration in operation, by reducing substantially the working man-hours necessary to work each part of the valve body, reducing the cost of the products and at the same time reducing the weight of a valve body substantially. SOLUTION: An outer sleeve 43 is fitted to an inner sleeve 42 is which plural window holes are opened arranged in about the same from in the peripheral direction, and plural oil grooved A, A... surrounded by the window holes and the inner peripheral surface of the outer sleeve 43, and aligned along the inner peripheral surface of the inner sleeve 42 are provided. A main body tube 44 is formed by a synthetic resin formation covering the outer side of the inner sleeve 42 and the outer sleeve 43 integrally, and including pressure leading grooves 45, 45... and seal member installing grooves 46, 46... provided on the outer periphery, so as to compose this valve body 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary hydraulic control valve that performs a hydraulic control operation by relative angular displacement of a valve body and a valve spool on the same axis. The present invention relates to a hydraulic control valve used in a power steering apparatus to control a hydraulic pressure supplied to a power cylinder for assisting steering according to a steering wheel operation.

[0002]

2. Description of the Related Art A hydraulic power steering apparatus assists steering by the generated force of a hydraulic actuator such as a double-acting hydraulic cylinder (power cylinder) arranged in a steering mechanism of an automobile, and a steering wheel (steering wheel). In order to obtain a comfortable steering feeling by reducing the labor load of the driver required for the operation (1), both the cylinder chambers of the power cylinder, the hydraulic pump driven by the engine, and the hydraulic oil are stored. A hydraulic control valve for supplying / discharging hydraulic pressure according to the direction and magnitude of the steering torque applied to the steering wheel is arranged between the hydraulic control valve and the oil tank.

As the hydraulic control valve, a rotary hydraulic control valve which directly utilizes the rotation of the steering wheel is generally used. This is to coaxially connect an input shaft connected to the steering wheel and an output shaft connected to the steering mechanism via a torsion bar, and connect the other to the inside of the cylindrical valve body engaged with one connection end. When a steering torque is applied to the steered wheels, a valve spool integrally formed at the end is relatively rotatably fitted, and a relative angular displacement is caused between the valve body and the valve spool due to the torsion of the torsion bar. After that, the hydraulic pressure is supplied and discharged using this relative angular displacement.

On the fitting circumference of the valve body and the valve spool (the inner circumference of the former and the outer circumference of the latter), a plurality of oil grooves are arranged side by side in a substantially equal arrangement in the circumferential direction. The oil grooves are staggered in the circumferential direction, and the valve spool and the valve spool are positioned so that the oil grooves adjacent to each other on both sides communicate with each other. The communication portion between the oil grooves acts as a throttle portion that increases or decreases the area according to the relative angular displacement between the valve body and the valve spool.

Supply of operating hydraulic pressure from the hydraulic pump, which is a hydraulic pressure source, is made to some of the oil grooves (oil supply grooves), and oil grooves (oil supply grooves) adjacent to both sides of these oil supply grooves are provided.
Are communicated with both cylinder chambers of the power cylinder, which is an oil destination, and an oil groove (an oil drain groove) adjacent to the other side of the oil groove is an oil drain destination of the oil. It communicates with the tank.

When a steering torque is applied to the steered wheels, a relative angular displacement occurs between the input shaft and the output shaft, that is, between the valve body and the valve spool, accompanied by the torsion of the torsion bar. The squeezing area of the squeezing portion changes. As a result, the hydraulic pressure supplied from the hydraulic pump to the oil supply groove is introduced into the adjacent oil supply groove on the same side through the throttle part on the side where the throttle area is increased, and the power cylinder of the power cylinder communicating with the oil supply groove is introduced. It is fed to one cylinder chamber.

As a result, the power cylinder generates an oil pressure corresponding to the pressure difference between the power cylinder and the other cylinder chamber,
This hydraulic pressure is applied to the steering mechanism as steering assist force to assist steering. Along with this operation, hydraulic oil is pushed out from the other cylinder chamber of the power cylinder and returns to the other oil feed groove of the hydraulic control valve. This return oil has a throttle area on one side of the oil feed groove. It is introduced into the oil drain groove through the increased throttle portion and is discharged to the oil tank which is the oil drain destination.

The communication between the oil supply groove and the hydraulic pump, and the communication between the pair of oil supply grooves and the respective cylinder chambers are generally liquid-tightly sealed on the outer circumference of the valve body. It is made via each pressure guiding groove which is provided around each other. That is, the plurality of oil supply grooves arranged inside the valve body and the plurality of oil supply grooves communicate with the respective pressure guiding grooves through oil passage holes that penetrate the peripheral wall of the valve body at the corresponding circumferential positions. The oil supply from the hydraulic pump is introduced into the corresponding pressure guiding groove and then supplied to the oil supply groove through the oil passage hole. The oil is collected in the corresponding pressure guiding groove through the oil hole and is fed to the cylinder chamber.

The communication between the oil drain groove and the oil tank utilizes a hollow portion formed inside the valve spool for inserting the torsion bar, and the drain formed on one side in the axial direction of the valve body. It is done through the oil chamber. That is,
The plurality of oil drain grooves lined up on the outside of the valve spool are formed by the first oil passage holes penetrating the valve spool at the circumferential positions corresponding to the respective oil drain grooves, and the oil drain chamber has a fitting region with the valve body. The second which penetrates the valve spool at the disengaged position
The return oils that are respectively communicated with the hollow portions by the oil passages of the above and are received in the discharge groove are collected in the hollow portions through the first oil passages, and further the second oil passages are After that, the oil is introduced into the oil drain chamber, and is discharged to the oil tank through the oil drain pipe connected to the oil drain chamber.

[0010]

In the hydraulic control valve as described above, the valve body engaged with the input shaft connected to the steering wheel or the output shaft connected to the steering mechanism has a substantially equal distribution on the inner peripheral surface. Is equipped with multiple oil grooves. Conventionally, these oil grooves are generally formed by a broaching process in which a processing jig (broach) having a plurality of teeth each having a width corresponding to each oil groove is inserted to form a plurality of recessed grooves on the inner surface of the cylinder. Are formed in a lump, and both sides of these concave grooves are closed by collar rings fitted to the inner circumferences of both ends of the cylindrical body to have a predetermined length in the axial direction. However, there is a problem in that it requires special processing such as the broaching and also requires precise processing of the fitting portion of the color ring, which requires a great number of processing steps.

In order to solve this difficulty, the actual Kaihei 5-37646
In the publication, a bush provided with a plurality of rectangular window holes corresponding to the oil groove in the circumferential direction is separately provided, and the bush is closely fitted to the inner side of the main body cylinder to form an inner peripheral surface of the main body cylinder. Disclosed is a hydraulic control valve in which the oil groove is formed by the window hole and the window hole. According to this configuration, processing for forming the oil groove is facilitated, and the number of processing steps of the valve body is reduced. It is supposed to be possible.

However, in addition to the formation of the oil groove on the inner peripheral surface of the valve body, it is necessary to form the pressure guiding groove circumferentially provided on the outer peripheral surface and the groove for mounting the sealing member therebetween. In the hydraulic control valve disclosed in Japanese Utility Model Laid-Open No. 5-37646, since the machining on the outer peripheral side is performed as it is, the effect of reducing the machining man-hours of the entire valve body is small.

On the other hand, self-excited vibration may occur in the valve body due to the oil flow passing through the throttle portion during the hydraulic pressure supply / discharge operation as described above. There is a disadvantage that the hydraulic pressure fed to the cylinder chamber of the previous power cylinder fluctuates and stable steering assistance cannot be performed. In order to suppress this self-excited vibration, it is effective to reduce the weight of the valve body and reduce the inertia. In Japanese Utility Model Laid-Open No. 5-37646, there is no description about self-excited vibration, but the bush that is the fitting portion with the valve spool is made of an iron-based material similar to the valve spool, while the main body cylinder is made of aluminum. It is disclosed that the weight of the valve body can be reduced by manufacturing a lightweight metal material such as an alloy. However, there is a limit to the weight reduction by using lightweight metal, and self-excited vibration cannot be effectively suppressed.

The present invention has been made in view of such circumstances, and can significantly reduce the number of processing steps required for processing each part of the valve body, which can contribute to the reduction of the product cost and the weight of the valve body. It is an object of the present invention to provide a hydraulic control valve that can be realized and that can effectively suppress the occurrence of self-excited vibration during operation.

[0015]

SUMMARY OF THE INVENTION A hydraulic control valve according to the present invention has a tubular shape in which a plurality of pressure guiding grooves and a mounting groove for a sealing member between the pressure guiding grooves are provided around the outer peripheral surface thereof. A valve body and a valve spool that are fitted inside the valve body so as to be capable of relative angular displacement on the same axis are provided, and a plurality of oil grooves lined up on the fitting circumference of the two are arranged in a staggered manner in the circumferential direction. A throttling section that changes a throttling area according to the relative angular displacement is formed between adjacent oil grooves, and a part or all of the oil groove is supplied with a hydraulic pressure source or oil through any of the plurality of pressure guiding grooves. In a hydraulic control valve that communicates with a tip or an oil discharge destination, the valve body is
An inner sleeve in which a plurality of window holes are formed in a substantially equal arrangement in the circumferential direction, and an outer sleeve which is fitted to the outer side of the inner sleeve and which forms the oil groove by the inner peripheral surface and each of the window holes. It is characterized by comprising a sleeve and a main body cylinder made of synthetic resin, which is integrally encapsulated inside thereof, and whose outer peripheral surface is molded including the pressure guiding groove and the mounting groove.

In the present invention, an outer sleeve is fitted to an inner sleeve having a plurality of window holes, and a core material having oil grooves formed at corresponding positions of the window holes is manufactured. On the outside of the material, a synthetic resin main body cylinder is integrally molded by a molding method such as injection molding to form a valve body, and by adopting a synthetic resin material, the overall weight is significantly reduced,
The main body cylinder is molded including the pressure guiding groove on the outer peripheral surface and the mounting groove of the sealing member, and the number of processing steps required for forming these is reduced.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic diagram showing an overall configuration of a rack and pinion type power steering apparatus including a hydraulic control valve according to the present invention. The rack and pinion type steering mechanism has a pinion 11 fixedly mounted on the lower end of a steering wheel shaft 10 coaxially connected to the lower side of the steering wheel 1 and extending in the left-right direction at the front part of the vehicle body. The rotation of the steering wheel 1 for steering is converted into sliding of the rack shaft 12 in the axial direction, and the rack shaft 12 is connected to both ends of the rack shaft 12 through separate knuckle arms. The steering wheels (generally the front wheels) 13 and 13 are turned to change the direction.

The power steering apparatus for assisting the steering operation of the rack and pinion type steering mechanism with hydraulic pressure as described above serves as a power cylinder S for steering assistance, which is formed in the middle of the rack shaft 12, and a hydraulic pressure source. A hydraulic pump P, an oil tank T serving as an oil discharge destination, and a hydraulic control valve 4 according to the present invention formed at the lower end portion of the steering wheel shaft 10 are provided, and these are connected to form a circulating oil passage as illustrated. The hydraulic pressure generated by the hydraulic pump P is sent to the power cylinder S by the operation of the hydraulic control valve 4 described later according to the operation of the steering wheel 1, while the power cylinder S
The return oil from the oil tank T is circulated to the oil tank T, the hydraulic pressure (steering assisting force) generated by the power cylinder S by the feed hydraulic pressure is applied to the rack shaft 12, and the rack shaft 12 slides. It is configured to assist movement.

FIG. 2 is a vertical cross-sectional view showing the structure of the main part of the power steering apparatus constructed as described above. In the figure, 2 is a hollow input shaft, 3 is a pinion shaft (output shaft),
These are abutted at their respective one ends and supported rotatably around the same axis inside the tubular valve housing 20. The abutting end portion (lower end portion) of the input shaft 2 is fitted to a cylindrical portion 3a connected to the abutting end portion (upper end portion) of the pinion shaft 3 for an appropriate length to allow relative rotation within a predetermined angle range. These are connected to each other by spline-connecting a small-diameter torsion bar 5 inserted in the hollow portion of the input shaft 2 and pin-coupled to the upper end portion to the upper end portion of the pinion shaft 3. ing.

The upper half of the input shaft 2 has a valve housing 20.
Of the steering wheel shaft 10 connected to the lower side of the steering wheel 1 at its protruding end. The pinion 11 is formed in the lower half of the pinion shaft 3, and the pinion 11 is supported in a rack housing 21 that intersects with the lower portion of the valve housing 20.
It meshes with 12.

When the steering wheel 1 is rotationally operated, the rotation of the steering wheel shaft 10 accompanying this is applied to the input shaft 2 and further transmitted to the pinion shaft 3 via the torsion bar 5. The rack shaft 12 meshing with the half-pinion 11 is converted into sliding in the axial direction for steering, and the sliding of the rack shaft 12 at this time is performed by steering wheels 13, 13 (see FIG. 1). Is performed against the reaction force from the road surface that contacts the ground, so that a relative angular displacement between the input shaft 2 and the pinion shaft 3 according to the steering torque applied to the steering wheel 1 with the torsion of the torsion bar 5 is generated. Occurs.

The hydraulic control valve 4 according to the present invention operates to control the hydraulic pressure to be fed to the power cylinder S by utilizing the relative angular displacement thus generated, and is provided inside the valve housing 20. It is provided with a cylindrical valve body 40 that is coaxially and rotatably held, and a valve spool 41 that is rotatably fitted inside the valve body 40. FIG. 3 is an enlarged view of the components of the hydraulic control valve 4.

As shown in the figure, the valve body 40 of the hydraulic control valve 4 engages the dowel pin 30 formed in the cylindrical portion 3a at the upper end of the pinion shaft 3 at its lower edge so as to rotate integrally with the pinion shaft 3. The valve spool 41 is integrally formed at a midway portion of the input shaft 2 fitted inside the valve body 40. This allows the valve body 40
Between the valve spool 41 and the valve spool 41, the relative angular displacement between the input shaft 2 and the pinion shaft 3 due to the operation of the steering wheel 1, that is, the relative angular displacement depending on the direction and magnitude of the steering torque applied to the steering wheel 1. Angular displacement will occur.

The characteristic of the hydraulic control valve 4 according to the present invention lies in the structure of the valve body 40 which rotates integrally with the pinion shaft 3 as described above. FIG. 4 is a vertical cross-sectional view of the valve body 40. As shown in the figure, the valve body 40 includes an inner sleeve 42 and an outer sleeve 43 that are coaxially fitted together, and a main body cylinder 44 that encloses the outer side of these. And are equipped with.

FIG. 5 is a perspective view showing an assembling mode of the inner sleeve 42 and the outer sleeve 43. Both the inner sleeve 42 and the outer sleeve 43 are thin-walled cylinders made of an iron-based material similar to the valve spool 41, that is, the input shaft 2.
42 is a plurality of window holes 42a, 42a penetrating the peripheral wall inward and outward.
It has. These window holes 42a, 42a ... Are rectangular openings having a predetermined width and extending in the axial direction, and the inner sleeve
They are evenly arranged in parallel in the circumferential direction of 42.

On the other hand, the outer sleeve 43 has an inner diameter and an axial length substantially equal to the outer diameter of the inner sleeve 42.
As shown by the arrow in (a), the inner sleeve 42 is press-fitted to the outside, and as shown in FIG. 5 (b), it is integrated so as to restrain the relative movement in the axial direction and the circumferential direction. Due to the integration, the inner circumference of the inner sleeve 42 is provided with the window holes 42a, 42a.
The rectangular oil grooves A, A, whose periphery is defined by the four sides of each of the ... and whose bottom is the inner peripheral surface of the outer sleeve, are arranged in parallel in a substantially equal arrangement in the circumferential direction.

The main body cylinder 44 which covers the outer sides of the inner sleeve 42 and the outer sleeve 43 integrated as described above is composed of both sleeves.
By injection molding with 42, 43 as the core material, three pressure guiding grooves 45, 45, 45 provided around the outer peripheral surface thereof at appropriate intervals,
It is a cylindrical body made of synthetic resin, which is formed by including the four mounting grooves 46, 46, which are provided around each other and on the other side of the pressure guiding grooves 45 at both ends, respectively. At the time of this molding, since the outer sides of the window holes 42a, 42a ... Of the inner sleeve 42 are closed by the outer sleeve 43, the oil grooves A, A ... Formed by the respective window holes 42a, 42a. Remain.

The oil grooves A, A, ... Formed in this way and the lands between the oil grooves A, A respectively have oil passage holes penetrating the outer sleeve 43 and the main body cylinder 44 at different circumferential positions. 47, 47, 47
To communicate with the pressure guiding grooves 45, 45, 45 on the outer side of the main body cylinder 44, and thus, the oil grooves A, A ... On the inner peripheral surface and the pressure guiding grooves 45, 45. A valve body 40 having grooves 46, 46 ... Is constructed.

The oil grooves A, A ... Have a plurality of window holes 42a, 42a.
It is obtained by press-fitting the outer sleeve 43 into the outer side of the inner sleeve 42 in which the ... Is opened, and the window holes 42a, 42a ... It can be easily formed by carrying out a processing method. Further, the pressure guiding grooves 45, 45 ... And the mounting grooves 46, 46 ... On the outer periphery of the valve body 40 are obtained at the same time as the molding of the main body cylinder 44 as described above, and further, the pressure guiding grooves 45, 45, 45 are respectively formed. The oil passages 47, 47, 47 communicating with the inside of the valve body 40 can be easily formed. Therefore, the valve body 40 in the present invention is
It can be obtained with a significantly smaller number of processing steps than in the past.

Further, since the main body cylinder 44, which occupies most of the valve body 40, is made of synthetic resin, the weight can be remarkably reduced as compared with the conventional valve body which is entirely made of metal. The synthetic resin used as the material of the main body cylinder 44 is a high-density resin having good moldability, has excellent oil resistance, and has a temperature range of operating oil expected during operation, for example, −
There is little change in characteristics within the temperature range of 40 ° C to + 135 ° C,
Furthermore, the internal pressure (13
It is selected so as to satisfy the condition that no harmful deformation occurs around (MPa) and the pressure can be maintained. As an example of such a synthetic resin, a polybutylene terephthalate (PBT) resin formed by adding an appropriate amount (about 30%) of glass fiber as a reinforcing material can be used.

The valve body 40 thus configured
Seal rings 6, 6 ... in the mounting grooves 46, 46 ...
And a cylindrical portion 3a at the upper end of the pinion shaft 3 which is coaxially and rotatably fitted inside the valve housing 20 together with these.
A part of the lower edge is engaged with the dowel pin 30 that has been driven in, and the dowel pin 30 is mounted so as to rotate integrally with the pinion shaft 3.
At this time, pressure guiding grooves 45, 45, 45 on the outer circumference of the valve body 40
Forms three chambers, which are liquid-tightly sealed on both sides with the sealing rings 6 and 6, between the inner circumference of the valve housing 20 and the pressure guide groove 45 at the center. As shown in FIG. 2, the pump port 22 is opened to the outside of the valve housing 20, and is connected to the hydraulic pump P serving as a hydraulic pressure source by an oil supply pipe (not shown) connected to the pump port 22. , 45 are communicated with a pair of cylinder ports 23, 24, which are also open to the outside of the valve housing 20, and are connected to both cylinder chambers of the power cylinder S, which is an oil destination, by oil feed pipes connected to these. Has been done.

Valve spool inside the valve body 40
On the outer peripheral surface of 41, the same number of oil grooves B, B ... as the oil grooves A, A ... on the inner circumference of the valve body 40 are formed in the circumferential direction, as shown in FIG. In the body 40 and the valve spool 41, respective oil grooves A and B are arranged in a staggered manner in the circumferential direction, and between the adjacent oil grooves A and B, a plurality of throttle portions that change the throttle area according to the relative angular displacement are provided. Positioned to form.

The valve body inside the valve housing 20
At the upper part of 40, an oil discharge chamber connected to the oil tank T through a tank port 26 opening to the outside of the valve housing 20.
25 are formed. Oil grooves B, B on the outer circumference of the valve spool 41
Half of the other ones are hollow inside the valve spool 41 due to the separate oil passage holes 27, 27 penetrating the valve spool 41 at the corresponding positions (only one is shown in FIG. 3). The hollow portion is communicated with the oil discharge chamber 25 by an oil passage 28 penetrating the valve spool 41 at a position outside the fitting portion of the valve body 40. B, B ... Configure an oil drain groove for draining oil to the oil tank T.

Further, the other half of the oil grooves B, B ... Are provided with oil passage holes 47 which are opened at the corresponding positions of the lands of the valve body 40 located on the outer side of these oil grooves B, B. And an oil groove A, A, ... Inside the valve body 40, each of which opens at a corresponding position. Are alternately communicated with the pressure guiding grooves 45, 45 on both sides of the outer circumference of the valve body 40 to form oil feeding grooves for feeding oil to both cylinder chambers of the power cylinder S. ing.

The hydraulic pressure supplied from the hydraulic pump P to the hydraulic control valve 4 passes through the central pressure guiding groove 45 on the outer periphery of the valve body 40 and the oil passage hole 47 communicating with the pressure guiding groove 45. Introduced into the oil supply groove, introduced into one of a pair of oil supply grooves adjacent to each other on both sides according to a change in the throttle area that occurs on the throttle portions on both sides thereof as described above, and through the cylinder port 23 or 24 The power is fed to either one of the cylinder chambers of the power cylinder S. With this hydraulic pressure feed, the power cylinder S
An oil pressure is generated in accordance with the pressure difference between the other cylinder chamber and the oil pressure is applied to the rack shaft 12 as a steering assist force as described above.

On the other hand, the hydraulic oil pushed out from the other cylinder chamber of the power cylinder S by this operation returns to the other oil feeding groove via the cylinder port 24 or 23, and is drained adjacent to the other side of the oil feeding groove. The oil tank T is introduced into the hollow portion inside the valve spool 41 through the oil passages 27, 27 ... Which are respectively received in the oil grooves, and further open through the oil passages 28, the oil discharge chamber 25 and the tank port 26. Is discharged to.

In the hydraulic control valve 4 according to the present invention, the main body cylinder 44, which occupies most of the valve body 40, is made of synthetic resin, and the weight is greatly reduced and the inertia is lowered. The self-excited vibration that occurs during the hydraulic pressure supply / discharge operation performed as described above can be effectively suppressed, and the stable hydraulic pressure feed to the power cylinder S does not fluctuate and stable steering assistance can be performed.

In the above embodiment, the application example to the rack and pinion type power steering apparatus has been described, but the application range of the hydraulic control valve 4 according to the present invention is not limited to this. It can also be applied to other types of power steering devices such as a ball screw type, and further has a valve body and a valve spool that are coaxially displaced relative to each other, and is lined up on the fitting circumference of both. It goes without saying that the present invention can be applied to all rotary hydraulic control valves that perform hydraulic control operation by changing the throttle area between the grooves.

[0039]

As described in detail above, in the hydraulic control valve according to the present invention, the outer sleeve is fitted to the inner sleeve, and the inner peripheral surface of the outer sleeve and the plurality of window holes formed in the inner sleeve are used. By forming the oil grooves and molding the synthetic resin with these as the core material to form the main body cylinder including the plurality of pressure guiding grooves on the outer periphery and the mounting groove of the sealing member between them, the oil inside The process for forming the groove, and the outer pressure guiding groove and the mounting groove is simplified, and the number of processing steps can be significantly reduced, which can contribute to the reduction of the product cost and the use of the synthetic resin material for the main body cylinder. By adopting the present invention, the present invention has excellent effects such as the occurrence of self-excited vibration during operation can be effectively suppressed due to the drastic weight reduction of the valve body, and stable control operation can be performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a rack and pinion type power steering apparatus including a hydraulic control valve according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a configuration of a main part of the power steering apparatus shown in FIG.

FIG. 3 is an enlarged cross-sectional view of components of a hydraulic control valve.

FIG. 4 is a vertical sectional view of a valve body.

FIG. 5 is a perspective view showing an assembling mode of an inner sleeve and an outer sleeve.

[Explanation of symbols]

 1 Steering wheel 2 Input shaft 3 Pinion shaft 4 Hydraulic control valve 5 Torsion bar 6 Sealing ring 40 Valve body 41 Valve spool 42 Inner sleeve 42a Window hole 43 Outer sleeve 44 Body tube 45 Pressure guide groove 46 Installation groove A Oil groove B Oil groove P Hydraulic pump S Power cylinder T Oil tank

Claims (1)

[Claims] 1. A cylindrical valve body having a plurality of pressure guiding grooves and a mounting groove for a sealing member between the pressure guiding grooves provided around the outer peripheral surface thereof, and coaxially inside the valve body. And a plurality of oil grooves lined up on the fitting circumference of the both are arranged in a staggered manner, according to the relative angular displacement between adjacent oil grooves in the circumferential direction. A hydraulic control valve that constitutes a throttle part that changes the throttle area, and connects a part or all of the oil groove to a hydraulic source, an oil destination, or an oil discharge destination through any of the plurality of pressure guiding grooves. In the above, the valve body has an inner sleeve in which a plurality of window holes are formed in a substantially equal arrangement in the circumferential direction, and the valve body is fitted on the outer side of the inner sleeve, and the inner peripheral surface thereof and the window holes respectively The outer sleeve that forms the oil groove and the inner sleeve that integrally encloses the outer sleeve, A hydraulic control valve, comprising: a groove, and a main body cylinder made of a synthetic resin including the mounting groove.