JPH0534191B2 - - Google Patents

Description

Claim 1: Two control valves comprising a valve piston disposed in a valve body, each of the valve pistons being movable within the valve body in the axial direction of the piston, and each of the control valves having a A pressure medium control device for a power steering device, wherein a hydraulic pressure chamber formed by a closing lid is disposed at one end, and the closing lid is held in contact with the valve body by a holding device. A pressure medium control device for a power steering device, comprising an elastic stopper 33 held by a shaft 34 fixed in a hole 40 of a valve body 1.

2. Pressure according to claim 1, characterized in that the elastic catch 33 has a curved part 37 adapted to the roundness of the shaft 34 in order to fix its position. Media controller.

3. The shaft rod 34 has an annular groove 38, and the elastic stopper 33 is fitted into the annular groove 38 and fixed in the axial direction of the shaft rod. Pressure medium control device according to item 2.

〔Technical field〕

The present invention relates to a pressure medium control device for a power steering device. In particular, the invention has two control valves with a valve piston disposed in a valve body, each of the valve pistons being movable within the valve body in the axial direction of the piston, and each of the control valves having a valve piston disposed in a valve body. The present invention relates to a pressure medium control device in a power steering device of the type in which a hydraulic pressure chamber formed by a closing lid is arranged at one end, and the closing lid is held in contact with a valve body by a holding device.

[Background technology]

Such a pressure medium control device is known from German Patent No. 1238789. In this control device, the closing lid of the reaction chamber is held in contact with the valve body by a sturdy retaining bridge. The retaining bridge is secured to the valve body by a bolt held in a detent. This structure is expensive, and if the retaining bolt retains the retaining plate insufficiently, there is a risk that the retaining bolt will loosen and thereby lock the steering device.

[Disclosure of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to securely hold the closure cover of the valve hole by simple means.

In order to achieve this objective, in the present invention,
A retaining device for retaining the closing lid on the valve body is constituted by an elastic catch held by a shaft fixed in a hole in the valve body.

The elastic catch used in the invention is a simple component which can be simply and reliably supported in contact with the closure lid by means of an axial rod which is fixed in the bore of the valve body. A curvature in its central portion fixes the catch in its longitudinal direction. An annular groove in the shaft is used to laterally fix the catch. In this way, natural loosening of the shaft rod as well as the elastic catch is reliably eliminated. Despite this secure holding, disassembly is facilitated since, after the elastic catch has been pushed away from the axle by means of a corresponding device, the axle is pushed out in the axial direction.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a pressure medium control device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line - in FIG. 1.

[Best mode for carrying out the invention]

The present invention will be described in detail below based on embodiments shown in the drawings.

A valve body 1 disposed at one end of a steering worm (not shown) is rotatably supported within a steering device casing 2. The steering worm is connected to a steering shaft (not shown) via a torsion rod so that it can be torsionally displaced. The fork-shaped end of the steering shaft has two driving pins 4, 5 which connect two control valves which are arranged eccentrically at right angles to the longitudinal axis of the pressure medium control device. It is used to adjust the two valve pistons 6, 7 at 8, 9.

Each of these control valves 8, 9 has an inlet annular groove 10, 1 communicating with an inlet chamber 12 of the control device, respectively.
1. Similarly, each control valve 8, 9 has a return annular groove 13, 14 and a cylindrical annular groove 15, respectively, which communicate with a pressure medium container (not shown) and with one of the two pressure chambers of the servo motor 19, respectively.
It has 16.

Both valve pistons 6, 7 have transverse grooves 20, 21 arranged at right angles to their longitudinal direction, in which the driving pins 4, 5 engage with a gap. ing. The valve pistons 6, 7 are connected to the driving pins 4, 5 by means of an elastic catch 22 at the contact line 2.
3 and 24 and are held in contact with each other. The elastic stopper 22 is held by a shaft rod 25, and this shaft rod 25
is held in the axial direction by a cutting recess 26 of the elastic stopper 22. The shaft rod 25 is inserted into a hole in the valve body 1.

Channels 27, 28 arranged in the valve pistons 6, 7
communicates with the cylindrical groove 15 or 16 and transfers the pressure in the corresponding pressure chamber 17 or 18 of the servo motor 19 to a return acting chamber arranged on the end face of the valve piston 6 or 7 opposite to the acting side of the catch 22. 29 to 30. The return chambers 29, 30 are axially limited by closing lids 31, 32, which are supported in fixed contact with the valve body 1 by means of an elastic catch 33 on a shaft 34. . Instead of a return effect chamber, another effect chamber, for example a damping chamber, can also be formed by the closure lid.

The catch 33 has two substantially flat legs 3 at both ends.
5, 36, with a curved portion 3 in its central region.
7 to match the roundness of the shaft rod 34. The shaft rod 34 has an annular groove 38 for fixing the catch 33 in the axial direction of the shaft rod 34. For assembly, the elastic catch 33 is fitted into the groove-shaped opening 39 of the valve body 1, compressed with a corresponding tool, and held and fixed by the shaft 34, which is fitted into the bore 40 of the valve body 1.