JPH04158946A - Manufacture of reservor tube for hydraulic shock absorber - 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 1. Field of Industrial Application] The present invention is a hydraulic shock absorber that is attached to the outside of a cylinder to form a reservoir chamber between the cylinder and the outer circumferential surface of the cylinder. relates to a method of manufacturing a reservoir tube for a hydraulic shock absorber having a bracket.

[Prior Art 1] Conventionally, this type of hydraulic shock absorber glue reservoir tube was made of iron and was therefore heavy.

For this reason, for example, in the case of automotive hydraulic shock absorbers, which require a strong demand for weight reduction, the large weight and reservoir tubes have been a major obstacle in reducing the weight.

[Problems to be Solved by the Invention] In order to reduce the weight of the reservoir tube, it is conceivable to make it made of a light metal such as aluminum.

However, if a bracket is welded to the outer periphery of the reservoir tube body made of aluminum or the like, the strength of the weld bead is weak, and there is a problem that, for example, sufficient strength for use in a vehicle cannot be secured. was there.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide a reservoir for a hydraulic shock absorber that can easily manufacture a high-strength and lightweight reservoir tube body and a bracket for mounting the outer circumference thereof. An object of the present invention is to provide a method for manufacturing a tube.

[Means for Solving the Problems 1] The method for manufacturing a reservoir tube for a hydraulic shock absorber according to the present invention includes closing one end of a cylindrical body made of a light metal such as aluminum having a protrusion on the outer peripheral surface by spinning, and Attachment of the reservoir tube is characterized in that the protrusion is formed on a bracket to manufacture the reservoir tube.

[Function 1] According to the present invention, by using a cylindrical body made of a light metal such as aluminum having a protrusion on the outer periphery as a material, a high-strength and lightweight reservoir tube with an integrated bracket is manufactured.

[Example] First, prior to explaining the method for manufacturing the reservoir tube of the present invention, a configuration example of a hydraulic shock absorber equipped with the reservoir tube will be briefly described.

In FIG. 4, 1 is a glue reservoir tube made of light metal such as aluminum manufactured according to the present invention (hereinafter simply "
A bracket lb is integrally formed on the outer periphery of the bottomed cylindrical main body 1a, and a through hole IC for a fixing device such as a bolt is formed in the bracket lb. enter. There is a cap 2 inside the tube 1.
A cylindrical cylinder 4 with a closed end is inserted through the tube 1 and is screwed onto the outer periphery of the tube 1. The cylinder 4 is fixed by a land stop collar 5. A reservoir chamber R3 is formed between the tube 1 and the cylinder 4. Also, the inside of cylinder 4 is
The first piston 7 connected to the piston rod 6
and second cylinder chambers R1 and R2.

When the piston 7 moves up and down, the first and second
The oil sealed in the cylinder chambers R and R3 enters and exits through an oil passage (not shown) formed in the piston 7,
A predetermined damping force is generated by the flow resistance at that time.

Further, gas is sealed in the reservoir chamber R3, and oil in the second cylinder chamber R3 is pumped through an oil passage (not shown) formed in the bottom valve 3 according to a change in the volume occupied by the piston rod 6 in the cylinder 4. It goes in and out of the reservoir chamber R3 through the passage.

1 to 3 show a first embodiment of the invention for manufacturing the tube 1 described above.

In this example, first, a cylindrical body 1O as shown in FIG. 1(a) is manufactured by extrusion molding of a light metal such as aluminum. This cylindrical body 10 has two parallel belt-shaped protrusions lOb extending along the axial direction on the outer circumference of a cylindrical main body 10a.

Next, as shown in FIG. 1(b), the protrusion 10b is cut to the size of the bracket 1b.

Then, before and after cutting the protrusion 10b, the main body 10a is
The lower end of is closed by spinning process.

That is, while rotating the main body 10a around its axis, a spatula or roller is pressed from the outside to remove the main body 1.
Close the lower end of a. FIG. 1(c) shows the main body 10
The finished state is shown in which the lower end of a is closed and the protrusion 10b is finished as a bracket lb.

FIGS. 5(a) and 5(b) show examples of different shapes of the bracket ib, and the brackets 1b having these shapes are formed by cutting the protrusion 10b of the cylindrical body 10.

Figures 6(a), (b) and (c) show tube 1
Examples of different planar shapes are shown in the figure (a), in which a curved surface 1d is formed at the base end of the bracket lb, and in the figure (b)
In this case, a plane 1e is formed between two brackets lbQ, and in the case shown in FIG.
It gradually becomes smaller toward the left end in the figure.

Effects of the Invention As explained above, according to the present invention, since the cylindrical body is made of a light metal such as aluminum and has a protrusion on the outer periphery, the bracket is integrated into a high-strength and lightweight reservoir. Tubes can be manufactured easily.

[Brief explanation of the drawing]

Figures 1 (a), (b) and (c) are explanatory diagrams of one embodiment of the present invention; Figure 2 is a side view of a buffer equipped with the reservoir tube shown in Figure 1; Figure 4 is a vertical sectional view of the shock absorber shown in Figure 2, Figures 5 (a) and (b) are perspective views of the reservoir tube showing different examples of bracket formation, Figure 6 ( a), (b) and (
c) It is a plan view showing different examples of the planar shape of the beam reservoir tube. DESCRIPTION OF SYMBOLS 1... Reservoir tube, la... Main body, 1b... Bracket, 10... Cylindrical body, 10a... Main body, 10b... Projection. Figure 1 (C) Figure 5 (b) d1 Figure 6 i

Claims (1)

[Claims] 1) A reservoir tube is manufactured by closing one end of a cylindrical body made of a light metal such as aluminum having a protrusion on its outer peripheral surface by spinning, and forming the protrusion on a mounting bracket for the reservoir tube. A method for manufacturing a reservoir tube for a hydraulic shock absorber.