JPS59106791A - Method of joining piping tube to valve housing, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining method, for example, when joining a piping tube installed between a hydraulic control pulp housing and an actuator of a power steering device to a pulp housing. Reduce the number of parts.

It is an object of the present invention to provide a method for joining piping tubes that can join a piping tube to a pulp housing or the like with simple processing, and that can obtain a joining structure that does not cause oil leakage or the like.

Conventionally, in order to join a piping tube to a pulp housing, etc., as shown in FIG. There is a method of screwing and fixing the tube (C) with a hollow bolt (2), as shown in Fig. 8, and a flare tube (
A method of bringing the tip of C) into close contact with the bottom of the hole on the base surface through a sheet union, or as shown in Fig. 9,
A method of forming an enlarged diameter part (G) in the tube C), inserting an OIJ tongue I) between it and the hole bottom 0 of the base body (2), and screwing and fixing it with a hollow port (■); As shown in FIG.

A method has been adopted in which a copper packing M is interposed between the hole bottom U) of the base body (2) and the end (L) of the tube (2), and is screwed and fixed with a hollow bolt CD). Either way.

Not only did it require a large number of parts and the machining was complicated, but there was also a high risk of oil leakage.

The invention is as set forth in the claims.

Seal the connecting end of the piping tube by crushing or other means,
When casting pulp housings, etc., the end portion is cast into 1
Next, when cutting the inner surface of the pulp housing, etc., the end of the sealed piping tube is also cut off at the same time.
The number of parts used is reduced by adopting a configuration that removes all the parts.

It is easy to process and there is no fear of oil leakage.

The end of the piping tube can be joined to a valve housing or the like.

The present invention will be described in detail below with reference to one drawing.

Figure 1 shows piping tubes 1 and 2 obtained by the method of the present invention.
The ends 3 and 4 of the valve housing 5 of the rack and pinion type power steering device are joined to the valve housing 5 of a rack and pinion type power steering device. Reference numeral 6 in FIG. 1 is a cylinder tube that also serves as a housing for the actuator and rack, and the piping tube 1
2 transports oil between the valve housing 5 and the cylinder tube 6.

2 to 5 show the implementation state of the method of the present invention in the order of steps, and the first step is shown in FIG.

The tips 7.8 of the ends 3, 4 of the piping tubes 1, 2 are sealed by means such as crushing as shown in FIGS. 2 and 3. This sealing is achieved when the valve housing 5 is cast, as will be described later.
2.

Next, as a second step, as shown in FIG.
Molds 9 and 10 are manufactured with the tips 7 and 8 protruding from each other.

The above-mentioned tips 7, 8 are cast into the cavity 11 and arranged so as to be located within the machining allowance (6) of the molded product.

Subsequently, as a third step, molten metal of a material such as aluminum is poured. As shown in FIG. 4, the obtained molded product is a material 12 with a machining allowance (5) for the pulp housing 5.
Inside, the ends 3, 4 and the tip 7 of the piping tube 1゜2,
8 is completely cast.

The above-mentioned machining allowance (2) is the thickness that is removed when cutting the inner hole diameter of the pulp housing 5 to a radius (r) from the center line (0-0).

Next, as the fourth step, the inner surface 13 of the material 12.

Cutting is performed by the amount of the cutting allowance (T).

During this cutting, along with the cutting 9th generation (5), the piping pipe 1,
The sealed tips 7 and 8 of 2 were also removed.

The material 12 has an inner hole radius (r) as shown in FIG.
The valve housing 5 has an inner bore 14.

A product is obtained in which the pipe tubes 1, 2 are cast together at their ends 3, 4, which communicate with the pulp housing 5 through openings 15, 16.

In the embodiment shown in FIGS. 3, 4 and 5, the ends 3, 4 of the piping tubes 1, 2 are cast into a straight cylindrical pulp housing 5, but as shown in FIG. As shown in FIG. 1, an enlarged diameter portion 19 may be formed at the end portion 18 of the piping tube 17, and this portion may be cast into the valve housing 2o, so that the bonding strength between the piping tube 17 and the valve housing 2o can be set to a certain value. Sealed end 2 of piping tube 17
1 is cut together with the cutting allowance (6), as in the previous embodiment.

Although the above-mentioned embodiment is an example in which the end of the piping tube is cast into the pulp housing, the piping tube can also be cast by the same means in the case of a cylinder tube to be cast.

The present invention has the configuration described above, and the piping tube to be joined to the valve housing etc. is integrally cast into the housing when the housing etc. is cast, so that the outer circumferential surface of the tube is integrally formed with the flesh of the pulp housing etc. This has the effect of creating a strong bond that does not cause oil leakage or the like.

In addition, the piping tube with its tip sealed is placed in the mold and cast, and after demolding, the joining is completed only by cutting the inner surface of the molded material, so the parts to be used include:
Since only the piping tube is required, the number of parts can be significantly reduced.

Furthermore, as for the process, the valve housing etc. can be formed and the piping tubes can be joined by simply sealing the tip of the piping tube, casting, and cutting the inner surface of the molding material, so simple processing is sufficient. be.

As a result of the above-mentioned effects, an inexpensive and highly reliable joining method can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view of essential parts of an example of a rack-binion type power steering device in which piping tubes are joined by the method of the present invention, and Fig. 2 is a front view of the sealed piping tube.
FIG. 3 is a cross-sectional view of one example of a mold in which the end of a piping tube is placed. Figure 4 is a cross-sectional view of the material cast in the mold shown in Figure 3, Figure 5 is a cross-sectional view of the material shown in Figure 4 after finishing, and Figure 6 is another implementation of the method of the present invention. A sectional view showing an aspect,
FIGS. 7 to 10 are cross-sectional views showing different conventional bonding structures. 1.2: Piping tube, 3, 4: End, 5: Valve housing, 7.8 = Tip, 9.10 = Mold, 11: Cavity, 13: Inner surface, 15° 16: Opening 1w: Cutting allowance

Claims (1)

[Claims] After the tip of the piping tube is sealed by means such as crushing, the tip is placed protruding into the cavity of a mold such as a pulp housing, and casting is performed. After demolding, a pulp housing including the sealed tip of the piping tube is produced. A method for joining a piping tube to a pulp housing or the like, which comprises cutting the inner surface of a material such as the like, cutting off the tip, and opening the piping tube into the pulp housing or the like.