JPH047391Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an inverted hydraulic shock absorber, and particularly to a structure for attaching an inner tube to an axle mounting bracket.

(Prior Art) A structure for attaching a hydraulic shock absorber to an axle mounting bracket is known as disclosed in Japanese Utility Model Publication No. 57-43743.

In this structure, a recess is formed in the axle mounting bracket, the lower end of the bottom case is inserted into the recess, and a bolt is screwed from below into a thread formed on the inner periphery of the seat pipe.

(Problems that the invention aims to solve) In the above structure, the bolt goes directly into the seat pipe, which complicates the seal structure to prevent oil leakage, and when the bolt is removed, the sealed oil leaks out. However, it was not possible to easily inspect whether there were any assembly defects.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a space between the lower end of the inner tube and the axle mounting bracket, and the axle mounting bracket faces this space. Bolt holes for axle tightening bolts were formed.

(Function) When assembling the hydraulic shock absorber, by removing the axle tightening bolt and opening the bolt hole, the space will be communicated with the outside through the bolt hole, and if there is an assembly defect, the space will be connected to the outside under the inner tube. Hydraulic oil flows out into the space on the side, and the hydraulic oil in this space flows out through the tightening bolt hole, making it easy to inspect for poor assembly.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view showing a hydraulic shock absorber according to the present invention in its most compressed state, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1.

This hydraulic shock absorber is closed by fitting a top cap 2 to the upper end of an outer tube 1, and inserting an inner tube 3 from below the outer tube 1 so as to be able to swing freely. A bottom cap 4 is fixed by caulking, and a cylinder 5 facing into the inner tube 3 is installed on the upper surface of the bottom cap 4.

A damping force generating mechanism 6 is attached to the inner periphery of the upper end of the cylinder 5, and a spring receiver 7 is attached to the upper end surface of the cylinder 5, and between this spring receiver 7 and a spring receiver 8 provided at the bottom of the top cap 2. A spring 9 is interposed to press the cylinder 5 downward.

Further, inside the cylinder 5, a piston rod 11 whose upper end is screwed onto the top cap 2 of the outer tube 1 faces from above, and a piston 12 that slides into contact with the inner circumferential surface of the cylinder 5 is fitted into the tip of the piston rod 11. The piston 12 is provided with an extension oil passage 13 and a compression oil passage 14, and an extension valve 15 for opening and closing the extension oil passage 13.

Further, an oil lock piston 17 as an oil lock collar is fixed to the tip of the piston rod 11 below the piston 12, and an oil passage 18 is formed in the oil lock piston 17. A check valve 19 is provided which opens at .

An oil lock piece 22 having a recess 21 into which the oil lock piston 17 fits is fitted into the lower end of the cylinder 5, and the cylinder 5 and the oil lock piece 22 are fixed by a locking ring 23. The oil lock piece 22 is fixed to the bottom cap 4 by a lock bolt 24 formed in the bottom cap 4 and inserted into the through hole 4a from below.

Further, the lower end of the inner tube 3 is fitted into the recess 27 of the axle mounting bracket 26, and the inner tube 3 is fixed by tightening a bolt (not shown) screwed into the mounting bracket 26. At this time, a space 28 is formed between the lower end surface of the inner tube 3 and the bottom surface of the recess 27 of the mounting bracket 26.

Furthermore, an axle mounting hole 29 is formed in the lower part of the mounting bracket 26, and the axle mounting hole 29 is further formed in the mounting bracket 26.
A slit 30 is formed facing the
A bolt hole 31 for a tightening bolt is formed facing into the space 28 through the bolt hole 31, and an axle mounting bolt 32 is screwed into the bolt hole 31 and tightened, so that the axle is fixed to the mounting bracket 26. I have to.

With the above configuration, when assembling,
By removing the axle tightening bolt 32 from the bolt hole 31, the lower space 28 of the inner tube 3 is communicated with the outside via the bolt hole 31.

At this time, due to poor assembly, the space between the inner tube 3 and the bottom piece 4 or the cylinder 5
If hydraulic oil leaks from between the inner tube 3 and the oil lock piece 22, this hydraulic oil will leak from the inner tube 3.
It flows out into the space 28 on the lower side, and further flows out from the bolt hole 31.

Therefore, when assembling the axle tightening bolt 32
An assembly defect can be inspected by simply removing the bolt from the bolt hole 31.

(Effect of the invention) As explained above, according to the invention, a space is provided between the lower end of the inner tube and the axle mounting bracket, and the axle mounting bracket is provided with a bolt for the axle tightening bolt facing this space. Since the holes are formed, assembly defects can be easily inspected by simply removing the axle tightening bolts during assembly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a hydraulic shock absorber according to the present invention in its most compressed state, and FIG. 2 is an enlarged sectional view of the main part of FIG. 1. In the drawings, 1 is an outer tube, 3 is an inner tube, 4 is a bottom cap, 11 is a piston rod, 12 is a piston, 17 is an oil lock piston, 22 is an oil lock collar, 26 is an axle mounting bracket, 27 is a recess, 28 is a space, 29 is an axle mounting hole, 31 is a tightening bolt hole, and 32 is an axle tightening bolt.

Claims (1)

[Scope of utility model registration request] In an inverted hydraulic shock absorber in which an inner tube is slidably inserted into an outer tube from below and the lower end of the inner tube is attached to an axle mounting bracket, there is a space between the lower end of the inner tube and the mounting bracket. 1. An inner tube mounting structure for a hydraulic shock absorber, characterized in that a space is provided, and the axle mounting bracket is formed with a tightening bolt hole that opens into the space.