JPS63309372A - Structure for welding member - Google Patents

Abstract

PURPOSE:To reduce the cost or a product by forming an annular projecting part around the hole of one part of welding member, arranging a welding leg on the other part of the welding member as well and welding both members at the tip of the welding leg. CONSTITUTION:An annular projecting part 20 is formed against the hole 11 of one part of a welding member 10 of a cylinder, etc. and an annular welding leg 21 is formed in advance on the other part of a welding member 12. Both welding members 10, 12 are located so as to surround the projection part 20 by the welding leg 21 and the outer periphery 30 at the tip of the welding leg 21 is welded by a welding means. In this case, the spatter accompanied by welding and molten Fe are checked by the projection part 20 of the member 10 and prevented to come into the hole 11 of the member 10. Accordingly the need for the finishing work of the deburring of the product inside after welding is eliminated. The cost of product is therefore reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in the structure of a welded member that allows two welded members to be efficiently welded and eliminates the need for finishing work after welding.

BACKGROUND OF THE INVENTION Various problems generally arise in finishing operations when two parts are welded together.

A typical example of welding two parts is shown in FIGS. 3 and 4. In these examples, a connecting tube 2 is welded to the outer surface of a hydraulic cylinder 1 in a power steering device. Note that the connecting tube 2 functions to supply and discharge oil to and from the hydraulic cylinder 1 (functioning as an inlet or an outlet).
The outer surface of the hydraulic cylinder is contacted so as to surround the hole 3 provided in the hole 3, and the outer periphery of the contact portion is welded by appropriate welding means.

As another example of prior art, a structure in which a hydraulic cylinder and a connecting tube are welded together in almost the same way as above was put into practical use in 1986-56486.
It is disclosed in the publication No.

Problems to be Solved by the Present Invention However, in the prior art as described above, spatter enters the hydraulic cylinder through the hole during welding, forming a convex portion on the inner surface of the cylinder, damaging the piston ring, and reducing the hydraulic pressure in the hydraulic cylinder. There was a drawback that leakage occurred between the rooms.

In addition, the melted Fe flows into the hydraulic cylinder through the holes and requires deburring after welding, which requires finishing work, resulting in high manufacturing time and manufacturing costs.

An object of the present invention is to provide a welded member structure that improves the drawbacks of the prior art as described above.

Means for Solving the Problems In order to achieve the above object, the present invention includes one welding member having a hole, and a cylindrical welding member welded to the one welding member so as to surround the hole. , an annular protrusion is formed at the opening of the hole, and an annular solution film surrounding the protrusion is formed on the other welding member.

Welding spatter or melted Fe by the protrusion
is prevented from entering the hydraulic cylinder.

EXAMPLE Hereinafter, an example in which the present invention is applied to welding a hydraulic cylinder and a connecting tube in a power steering device will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 10 designates one of the welding parts, namely a known hydraulic cylinder. This hydraulic cylinder has a hole 11 that serves as an oil supply or discharge port.

The other welding element, ie the known connecting tube 12, is arranged on the outer surface of the hydraulic cylinder. This connecting tube is the center hole 13
have. This connecting tube is arranged on the outer surface of the hydraulic cylinder such that its center hole 13 is aligned with the hole 11 of the hydraulic cylinder.

An annular projection is formed at the opening of the hole 11 of the hydraulic cylinder 10.

An annular solution film 21 is formed on the connecting tube 12 .

The connecting tube 12 is arranged so that its solution film 21 surrounds the protrusion of the hydraulic cylinder, and the tip of the solution film 21 is arranged in contact with the outer surface of the hydraulic cylinder.

The outer periphery of the tip of the solution film 21 is welded by any welding means.

In the above configuration, during welding, spatter and molten Fe are blocked by the addition of the protrusion B and do not enter into the hole 11 and, by extension, into the hydraulic cylinder. In other words, the protrusion is added to the welding part 2.
The hole 11 functions as a blocking wall to prevent spatter from entering between the hole 11 and the hole 11.

In addition, the clearance c1 between the protruding part and the solution film 21 is made small, and the clearance C2 between the tip surface of the protruding part and the bottom surface 12a of the root of the solution film of the connecting cylinder is made zero or extremely small at the end of welding. It is preferable to prevent dissolved Fe from flowing into the hydraulic cylinder by doing so.

FIG. 2 shows another embodiment of the invention, in which similar parts to those in FIG. 1 are given like reference numerals. In this embodiment, a large tapered portion 40 is formed on the outer periphery of the tip of the solution film 21. By doing this, the spatter and dissolved Fe 2 flow outward as shown by the arrows in FIG. 2, and it is possible to more reliably prevent spatter and the like from entering the holes 11.

Effects of the Invention According to the present invention, it is possible to prevent spatter, etc. from entering the hydraulic cylinder during welding by the projection and the solution film surrounding the projection, as described above. There is no need for finishing such as deburring, and therefore there is a practical benefit in that it is extremely easy to manufacture hydraulic cylinders, etc., and the manufacturing cost is low.

In the above embodiment, the present invention was applied to welding the hydraulic cylinder and the connecting tube in a power steering device.
The invention can be applied to other devices and structures. For example, when welding a second tube arranged to surround the hole to the outer surface of a first tube having a hole, the first tube is An annular protrusion may be provided at the opening of the hole of the second tube, and an annular solution film may be provided on the second tube so as to surround this protrusion.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a welded member structure according to the present invention, FIG. 2 is a cross-sectional view showing another embodiment of the present invention, and FIG.
4 and 4 are cross-sectional views of conventional welded member structures.

Claims (1)

[Claims] One welding member having a hole, and the other cylindrical welding member welded to the one welding member so as to surround the hole, an annular protrusion being formed at the opening of the hole, A welding member structure characterized in that an annular welding leg surrounding the projection is formed on the other welding member, and a tip of the welding leg is welded to the other welding member.