JPS5817264A - Production method of rotary valve - Google Patents

Abstract

PURPOSE:To simplify the port groove work by forming port grooves on a thin plate under press punching, etc. and by forming it into a ring shape which is then inserted into the inner circumference of a valve sleeve body to produce a valve sleeve. CONSTITUTION:The valve sleeve of a rotary valve is constituted with a sleeve main body and an inner ring 9 inserted into the inner circumference of the sleeve main body, and port grooves 4a are formed on the inner ring 9. A plurality of square port grooves 4a are formed on a thin plate 18 under press punching, etc. at a certian distance in the lengthwise direction, and after the plate is formed into a ring shape, the joint 19 is welded to produce the inner ring 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing Shun-Tada pulp, and its purpose is to simplify the machining of port grooves on the inner periphery of the pulp sleeve of the first pulp, which is constituted by a pulp sleeve on a pulp tool. That's true.

As shown in Figures 2 and 2, the pulp sleeve, which is one of the parts constituting the 11-ta ν pulp, has a plurality of holes 4 formed around the circumference of the pulp sleeve 1, which communicate with the distribution holes 2. Conventionally, the port groove 4 has been processed by cutting with a broach or the like, and therefore, openings are formed at both ends of the port #I4. Therefore, sealing rings 5 are fitted to both ends of the port #I4. In such conventional processing methods, it is difficult to form the port groove on the circumference of the pulp sleeve, and the rings that fit into both ends of the port groove are exposed to high pressure. Because of this, it is necessary to increase the tightening margin to prevent it from coming off, and as a result, there is a risk of cracks occurring during press-fitting (and there is a risk of foreign matter getting into the seal image).The present invention solves the above-mentioned conventional problems. The gist of this method is to form a port groove in 111 by press punching or machining, make this thin plate into a ring shape, and weld the joint to create an inner ring. A concrete example of the method of the present invention will be described below with reference to Figs. The valve, especially the pulp sleeve 1, is composed of a sleeve body 1m and a circular ring 9 fitted around the circumference of the sleeve body 16, as shown in FIG. 4g is formed.

An example of the manufacturing order of this pulp sleeve l will be explained with reference to Fig. 5.First, as shown in Fig.
Prepare a thin plate 18 cut into a rectangle of Sg, and cut this thin plate 1[
18, a plurality of rectangular boat grooves 4a are formed at regular intervals in the longitudinal direction by press punching or machining as shown in FIG. The inner ring 9 is made into a ring shape and has a plurality of holes (94g) at equally divided positions on the circumference.
Create. The outer circumferential direction of the inner ring 9 is ground to a predetermined dimension, that is, a dimension corresponding to the inner diameter dimension of the sleeve body 1m, and then the inner ring 9 is fitted onto the inner circumference of the sleeve body 16 and fixed by beam welding or the like.

In this way, the circumference of the pulp sleeve 1 in which the sleeve body l@ and the circular ring 9 are integrated, that is, the circumference of the inner ring 9, is ground to a predetermined dimension, and the inner circumference of the pulp sleeve l, that is, the inner ring 9#2: The distribution hole 2, bottle hole 3, and supply hole 17 are machined at predetermined angular positions based on the port groove 46 provided.

In addition, as another manufacturing example, the sleeve body 16 may have a distribution hole 2,
After performing all the necessary machining for the bottle hole 3, supply hole 17, etc., when machining the port groove 4g in the thin plate 1 [18], a hole corresponding to the supply hole 17 is formed at the same time, and the inner ring 9 is formed. After that, the inner and outer circumferences of the inner ring 9 are ground to predetermined dimensions. Then, the inner ring 9 is placed at a predetermined angular position with respect to the sleeve body 1a, and the port groove is at a predetermined angular position with respect to the bottle hole 3#c, so that the hole of the inner ring 9 and the supply hole of the sleeve body 1@. 7
It is also possible to position and fit and fix them so that they match.

FIGS. 3 and 94 show an example in which a rotary pulp provided with a pulp sleeve 1 manufactured by the above method of the present invention is used in a power steering device of an automobile.

6 is a pulp housing, which has a supply/discharge boat 7 connected to an oil pump and an oil tank (not shown), and a supply/discharge boat 8 connected to the power cylinder (left and right chambers of the cap 1).

A gear/Using groove is integrally fixed to the pulp housing 6, a pinion shaft U is rotatably supported in this gear/S-Using U, and furthermore, this pinion shaft 14
The rack shaft that meshes with the rack guide 16&c is guided. A piston of a power cylinder is operatively connected to the rack shaft.

On the other hand, a rotary valve is installed inside the pulp housing 6. This rotary valve is composed of the pulp sleeve l produced by the method of the present invention and a pulp spool. They are fitted so that they can rotate relative to each other about the axis of the pinion shaft 14. The pulp sleeve I is connected to the pinion shaft 14 through a connecting pin 4 that fits in the bottle hole 3, and is formed integrally with a steering shaft U that is connected to the pulp spool 10 and a steering handle. This steering shaft U is flexibly connected to the pinion shaft 14 via a torsion barse connected by a pin I.

Therefore, one turn of the handle causes torsion/(-m
is twisted, the pulp spool W rotates once against the pulp sleeve 1, thereby controlling the fluid pressure, actuating the power cylinder, and outputting it to the rack shaft door as a steering output to reduce the steering force. The port groove 4- formed on the inner periphery of the pulp sleeve 1 for controlling pressure is divided into the sleeve main body IS and the inner ring 9, and is formed by press punching or machining into the thin plate door that is the material of the inner ring 9. Since it is formed into a ring shape, the processing of the bow 111 is easy, and the fitting of the sealing ring that closes both ends of the port groove 4m is a military asset, and the fitting of the sealing ring is not required. It has the effect of eliminating the traditional gambling problem of mourning all at once.

[Brief explanation of drawings]

IEIII is a sectional view of a pulp sleeve in a conventional rotary pulp, FIG. 2 is a sectional view taken along the line I-1 in FIG. Figure 3 mV-N line sectional view, 5th
The figure is an explanatory view showing an example of the manufacturing sequence of the circular ring of the cylinder valve sleeve using the method of the present invention. 1... Valve 9-F, 1α-... Sleeve body, 4
g...Boat groove, 9...Inner ring, W...Pulp spool, 18...-Thin plate, 19...Joint portion.

Claims (1)

[Claims] In rotary pulp, which is composed of a pulp sleeve and a valve spoo wagged inside the pulp sleeve, a plurality of port grooves are formed in a thin plate by press punching or machining, and the thin plate is formed into a ring shape to form a joint. A method for manufacturing rotary pulp, which comprises manufacturing a pulp sleeve by manufacturing a round ring and fitting this inner ring into the inner periphery of a sleeve body.