JPH025622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing a sealing ring to a sleeve valve member of a rotary valve used in a power steering device.

Conventionally, a rotary valve used in a power steering device, particularly a sleeve valve member thereof, has a concave groove formed in the axial direction on the inner peripheral surface of a cylindrical hole of the sleeve valve member by passing a broach tool or a similar cutting tool therethrough. , and a sealing ring is disposed at the end of the sleeve valve member to close the end of the groove.

The above-mentioned conventional rotary valve has the advantage that the concave groove can be easily and precisely machined by broaching, but on the other hand, it is easily affected by the press-fitting allowance of the sealing ring into the sleeve valve member, and for example, this press-fitting allowance is too small. This has the disadvantage that the sealing ring may come off due to the fluid pressure or the pressure fluid may leak from the joint.On the other hand, if the pressure difference is too large, the sleeve valve member may be deformed or cracked.

For this reason, in the past, the fitting portion of the sealing ring or sleeve valve member had to be precisely machined to ensure a certain press-fit allowance, which increased processing costs and required inventory of a large number of matching parts. I have a problem that needs to be addressed.

The present invention has been made to solve these conventional problems, and its purpose is to provide a method for fixing a sealing ring that prevents the sealing ring from coming off and does not cause leakage of pressure fluid. It is.

Still another object of the present invention is to provide a method of fixing a sealing ring that is extremely easy to manufacture and does not cause deformation or cracking of the sleeve valve member.

In order to achieve the above-mentioned object, the present invention is configured to fit the sealing ring into the fitting holes at both ends of the sleeve valve member, and then caulk the ends of the sleeve valve member to fix the sealing ring to the sleeve valve member. It is something.

Embodiments of the present invention will be described below based on the drawings. What is shown in FIGS. 1 and 2 is an example in which the present invention is applied to a rotary valve of a power steering device, and 10 is a housing main body forming the main body of this power steering device. A pinion shaft 13 is rotatably supported in the housing body 10 via a pair of bearings 11 and 12.
There is a rack shaft 1 that can slide in the direction crossing this.
The four lock teeth 15 are in mesh with each other. As shown in FIG. 2, this rack shaft 14 is equipped with a piston 17 of a power cylinder 16, and both ends thereof are connected to steering wheels via a required steering linkage.

On the other hand, inside the valve housing 18 fixed to the housing body 10 is a steering shaft 20 flexibly connected to the pinion shaft 13 via a torsion bar 19, and a rotary valve 21 whose rotation is controlled by the steering shaft 20. is accommodated. The rotary valve 21 includes a spool valve member 22 integrally formed with the steering shaft 20 and a sleeve valve member 24 connected to the pinion shaft 13 via a connecting pin 23.
is the main component, and the spool valve member 2 is connected to the cylindrical hole 25 formed in the sleeve valve member 24.
2 are fitted and supported so as to be relatively rotatable.

A plurality of grooves 26 extending in the axial direction are formed at equal intervals in the circumferential direction on the outer peripheral surface of the spool valve member 22,
Similarly, a plurality of grooves 27 extending in the axial direction are formed in the cylindrical hole 25 of the sleeve valve member 24 at equal intervals in the inner circumferential direction. and 27 to control the supply and discharge of pressure fluid to and from the power cylinder 16.

Furthermore, as shown in FIGS. 3 and 4, fitting holes 29 having a larger diameter than the cylindrical hole 25 are formed at both ends of the sleeve valve member 24, and the ends of the groove 27 are formed in the fitting holes 29. A sealing ring 30 is fixed. That is, the sealing ring 30 is connected to the fitting hole 2.
The sealing ring 30 is fitted into the fitting hole 29 by applying an adhesive to the outer peripheral surface and end surface of the sealing ring 30 . In this state, as shown in FIG. 3, a caulking tool 31 is driven into the end face of the sleeve valve member 24, and the edge 32 of the fitting hole 29 is deformed around the entire circumference toward the center as shown in FIG. and securely hold the end of the sealing ring 30.

Further, as a method of fixing the sealing ring 30, as shown in FIG. 5, skirt portions 35 are provided at both ends of the sleeve valve member 24, and the sealing ring 30 is fitted into the fitting hole 29 in the same manner as described above. Afterwards, the skirt portion 35 can be caulked inward to fix the skirt portion 36.

In the above embodiment, an example was described in which the sealing ring 30 and the fitting hole 29 are fitted in a tight fit relationship, but the same effect can be obtained even if the fitting relationship between the two is made to have a slight interference. It is something that can be played.

As described above, the present invention is a method in which a sealing ring is fitted into a fitting hole of a sleeve valve member with a loose fit or a slight tightness, and then the sealing ring is fixed by caulking. The fitting accuracy with the sealing ring can be made relatively rough, the sleeve valve member can be prevented from deforming or cracking due to press fitting, and the sealing ring can be securely and easily fixed by caulking. With these, not only can manufacturing be facilitated, but also excellent sealing performance can be ensured.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a longitudinal sectional view of a power steering device equipped with a rotary valve to which the method of the present invention is applied, and FIG.
3 is a cross-sectional view of the sleeve valve member showing the state in which the sealing ring is fitted; FIG. 4 is a vertical cross-sectional view of the sleeve valve member showing the sealing ring in the fixed state; FIG. 5 is a cross-sectional view of the sleeve valve member according to the present invention. FIG. 3 is a sectional view showing another embodiment of the invention. 24...Sleeve valve member, 27...Concave groove, 29
...Fitting hole, 30...Sealing ring.

Claims (1)

[Claims] 1 A sleeve valve member and a rotor valve member are fitted to each other so as to be relatively rotatable, and a plurality of grooves are formed along the axial direction on the inner and outer peripheries of the sleeve valve member and rotor valve member, and The sleeve valve member of the power steering device is configured to control the supply and discharge of pressure oil to and from the power cylinder by relative rotation of the sleeve valve member and the rotor valve member. In the method of fixing a rotatably fitted sealing ring, the sealing ring is fitted into the fitting holes at both ends of the sleeve valve member, and then the ends of the sleeve valve member are caulked to fix the sealing ring to the sleeve valve member. A method for fixing a sealing ring to a sleeve valve member, the method comprising: fixing a sealing ring to a sleeve valve member.