JPH0537646U - Steering force control device for power steering device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a steering force control device for a power steering device, which can be made lightweight and can be manufactured easily and inexpensively. [Structure] A rotation control valve 1 comprising a rotor 3 and a valve body 2 rotatably fitted to the rotor 3 and having a plurality of concave grooves 15 formed on an inner diameter surface of the valve body 2. In the power steering device, the valve body 2 is
The valve body main body 4 is formed into a cylindrical body, and the bush 5 is tightly fitted in the valve body main body 4 and has a plurality of opening grooves 14 formed therein. 4 and the opening groove 14 of the bush 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a steering force control device equipped with a rotation control valve, among steering force control devices for a power steering device such as an automobile power steering device.

[0002]

[Prior art]

 Conventionally, this type of steering force control device is provided with a rotation control valve as described, for example, in Japanese Patent Laid-Open No. 58-53564.

As shown in FIG. 3, this rotation control valve is rotatably fitted to a torsion bar 21 that connects an input shaft and an output shaft (not shown) on the same axis and is rotated together with the input shaft. And a valve body 22 that is rotatably fitted to the rotor 3 and is rotated together with the output shaft, and is rotatably housed in a valve housing (not shown). On the inner diameter surface of the valve body 22, a plurality of recessed grooves 15A and 15B are formed alternately in the circumferential direction, and on the outer diameter surface of the rotor 3, a plurality of recessed grooves 16 are disposed along the shaft center. Is formed so as to be staggered with the concave grooves 15A and 15B, and a plurality of supply holes 10 are formed in the valve body 22 so as to communicate with each other via ring-shaped supply grooves (not shown). Is formed so that a plurality of discharge holes 17 are located one by one between the supply holes 10 and 10. Further, in the valve body 22, a plurality of connection holes 11A communicating with the inside of the concave groove 15A located on one side in the circumferential direction from each supply hole 10 communicate with each other via a ring-shaped connection groove (not shown). A plurality of connection holes 11B that are formed and that communicate with the inside of the concave groove 15B located on the other side in the circumferential direction from each supply hole 10 are formed so as to communicate with each other via another ring-shaped connection groove (not shown). The ring-shaped grooves are defined in the valve housing independently of each other by a seal. One of the two connection grooves is connected to one hydraulic chamber of the steering assist cylinder (not shown), and the other is connected to the other hydraulic chamber of the steering assist cylinder. There is. Then, the two valve mechanisms P are formed by the side wall tip edges 23a, 23a of the concave groove 15A of the valve body 22 and the tip edges 25, 25 of the protrusions 24 formed between the concave grooves 16, 16 of the rotor 3._A, Q_AAnd the side wall tip edges 23b and 23b of the groove 15B of the valve body 22 and the tip edges 25 and 25 of the protrusions 24 formed between the groove 16 and 16 of the rotor 3. _B , Q_BAnd are configured.

In the rotation control valve of such a steering force control device, the concave grooves 15A, 15B provided on the inner diameter surface of the valve body 22 form the valve mechanisms P _A , Q _A , P _B , Q _B. It is necessary to form them with high precision. Conventionally, for example, after first forming annular press-fitting grooves (not shown) on the inner diameter surfaces of both ends of the valve body 22, both ends of the press-fitting groove are opened on the inner diameter surface of the valve body 22. A groove is formed in the valve body 22. After that, a collar ring (not shown) is press-fitted into the press-fitting grooves at both ends of the valve body 22 to close both ends of the groove. , 15B was formed.

[0005]

[Problems to be solved by the invention]

 However, the groove portions that become the concave grooves 15A and 15B must be accurately carved on the inner diameter surface of the valve body 22, and the processing is limited to broaching, shaver processing, etc., and the inner diameter surface of both ends of the valve body 22 is limited. Since it is necessary to form an annular press-fitting groove in it, the processing cost is high. Further, in order to reduce the weight of the power steering device, it is conceivable to manufacture the valve body 22 entirely with an aluminum alloy or the like, but in consideration of the erosion of the hydraulic fluid, it has been forced to manufacture it with an iron system.

The present invention has been made to solve the above-mentioned conventional problems, and provides a steering force control device for a power steering device, which can reduce the overall weight and can be manufactured easily and inexpensively. To aim.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention comprises a rotor and a valve body rotatably fitted to the rotor, the rotary body having a plurality of concave grooves formed on an inner diameter surface of the valve body. In a power steering apparatus having a control valve, the valve body includes a valve body main body formed in a cylindrical body, and a bush closely fitted in the valve body main body and having a plurality of opening grooves formed therein. The concave groove is formed by the inner diameter surface of the valve body main body and the opening groove of the bush.

[0008]

[Action]

 The valve body is manufactured by separately manufacturing the valve body main body and the bush, and then closely fitting the bush in the main body of the valve body.

Further, in order to form the concave groove on the inner diameter surface of the valve body, the opening groove may be formed in the bush before the assembly to the valve body main body.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an exploded perspective view showing a rotation control valve which is a main part of a power control device, and FIG. 2 is a longitudinal sectional view showing the rotation control valve of FIG. 1 in an assembled state.

The rotation control valve 1 is composed of a valve body 2 and a rotor 3.

The valve body 2 is composed of a valve body body 4 made of a lightweight material such as an aluminum alloy, and a bush 5 made of an iron-based material.

The valve body 4 is formed into a cylindrical body that fits inside a valve housing (not shown), and has an outer diameter surface on which a supply groove 6, a pair of connection grooves 7A and 7B, and a seal groove 8 are provided. They are formed in a ring shape and arranged side by side. Inside each of the seal grooves 8, a seal ring 9 that is in contact with the inner diameter surface of the valve housing is mounted on both sides of each of the grooves 6, 7A, 7B and 8.

The valve body 4 has a supply hole 10 which is opened in the supply groove 6 and is opened in the supply groove 6, a connection hole 11A which is opened in the connection groove 7A, and a connection groove 7B. A connection hole 11B is formed, and an end ring body 12 is integrally provided at one end of the inner diameter surface 4a of the valve body 4 so as to press fit an end ring body (not shown) at the other end. The press-fitting groove 13 is recessed.

Further, the bush 5 is formed with a plurality of opening grooves 14 along the axis at equal intervals.

The bush 5 is tightly fitted in the valve body 4 and is fixed between the end ring body 12 and an end ring body (not shown), whereby the valve body 2 is assembled. The concave groove 15 provided on the inner diameter surface of the valve body 2 is formed by the inner diameter surface 4a of the valve body 4 and the opening groove 14 provided on the bush 5.

The supply hole 10 is provided so as to be opened in such a recessed groove 15, and the connection hole 11 A communicates with the inside of the recessed groove 15 A located on one side in the circumferential direction with respect to each supply hole 10 and also has a connection hole. 11B communicates with the inside of the concave groove 15B located on the other side in the circumferential direction from each supply hole 10.

In the above structure, first, the grooves 6, 7A, 7B, 8 are formed on the outer diameter surface of the valve body 4, and the end ring body 12 is integrally provided at one end of the inner diameter surface 4a so as to project. In addition, the press-fitting groove 13 is provided in the other end. Further, the opening grooves 14 are formed in the bush 5 at equal intervals by electric discharge machining or an end mill. Then, the bush 5 is tightly fitted in the valve body 4 from one end side to the other end side end ring body 12, and the end ring body and the end ring body (not shown) press-fitted into the press-fitting groove 13 are formed. After fixing the bush 5 to the bush 12, the supply hole 10 for communicating the inside of the supply groove 6 and the inside of the concave groove 15, the connection hole 11A for connecting the inside of the connecting groove 7A and the inside of the concave groove 15A, and the connecting groove 7B. A connection hole 11B for communicating the inside and the inside of the concave groove 15B is formed. Thereafter, the inner diameter surface 5b of the bush 5 is ground so as to obtain an appropriate clearance with the rotor 3, and the seal ring 9 is mounted in each seal groove 8.

After assembling the rotor 3 in the valve body 2 as described above, the valve body 2 is rotatably fitted in a valve housing (not shown) and sealed by the seal rings 9 mounted in the respective seal grooves 8. The grooves 6, 7A, 7B and 8 are defined independently of each other.

A plurality of recessed grooves 16 are formed on the outer diameter surface 3 a of the rotor 3 along the axis, and a plurality of discharge holes 17 are formed in the rotor 3 to supply holes 10, 10 of the valve body body 4. The valve body 2 is formed so as to communicate with the inside of the concave groove 16 so that the concave grooves 15 of the valve body 2 and the concave groove 16 of the rotor 3 are alternately arranged in the circumferential direction. The rotor 3 is attached to the.

[0022]

[Effect of the device]

 As described above, according to this invention, since the valve body is made up of the valve body and the bush, and is manufactured separately, the bush is tightly fitted inside the valve body to assemble the valve body to form the valve body. Since a lightweight material such as aluminum alloy can be used for the main body and a durable material such as iron can be used for the bushing part of the pressure generating part, the overall weight can be reduced while maintaining durability and reliability. Can be achieved. Also, in order to form a concave groove on the inner diameter surface of the valve body, it is sufficient to form an opening groove in the bush before assembling it to the valve body body, which can be easily processed by a general-purpose machine or electric discharge machining. Moreover, it can be manufactured at low cost, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a rotation control valve according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing the rotation control valve of FIG. 1 in an assembled state.

FIG. 3 is a cross-sectional view showing a conventional rotation control valve.

[Explanation of symbols]

 1 Rotation Control Valve 2 Valve Body 3 Rotor 4 Valve Body Main Body 4a Inner Diameter Surface 5 Bushing 5a Outer Diameter Surface 5b Inner Diameter Surface 14 Opening Groove 15, 15A, 15B Recessed Groove

Claims (1)

[Scope of utility model registration request] 1. A power steering system comprising a rotor and a valve body rotatably fitted to the rotor, the rotation control valve having a plurality of concave grooves formed on an inner diameter surface of the valve body. In the above, the valve body includes a valve body main body formed in a cylindrical body and a bush closely fitted in the valve body main body and having a plurality of opening grooves formed therein. A steering force control device for a power steering device, which is formed by an inner diameter surface of a body and an opening groove of a bush.