JPS5926819B2 - Means for fastening the cylinder end piece to the buffer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a cylinder in which the piston can move together with a piston rod, and in which the piston rod moves against the piston rod installed at one end of the cylinder. The present invention relates to a shock absorber, in particular a gas-filled shock absorber, which extends through a cylinder end piece having a ring, the cylinder end piece being sealed against one end of the cylinder by a packing ring of elastic material.

Such a connection between one end of a cylinder and a cylinder end piece is already known in the shock absorber art.

The cylinder end piece is held in place in this known shock absorber by a threaded cap.

The cap is therefore provided with an internal thread and the outside of the cylinder is provided with an external thread so that the cylinder end piece can be secured against movement between the cap and one end of the cylinder.

This known structure has various drawbacks.

First, the internal and external thread construction is relatively expensive.

Second, although this structure allows the cap to be unscrewed, this operation is extremely dangerous in a shock absorber filled with high-pressure gas.

For example, if a non-skilled person assumes that the screw cap is the part of the adjustment member that can adjust the shock absorber because the gap is somewhat similar to an existing adjustment member, then by unscrewing the cap, the high-pressure may erupt.

A third difficulty is that a rotational movement of the cap is required when assembling the buffer.

This operation is normally carried out in a closed high-pressure gas-filled chamber in which the gas is already under the required pressure.

This method makes it possible to omit extra openings in the buffer that would otherwise be necessary to fill the buffer with gas after assembly, and which in practice often lead to leaks.

This means that the assembly of the shock absorber takes place in an inaccessible room so that the assembly takes place semi-automatically with mechanical assistance.

Assembly of threaded connections is not easy under these circumstances.

The object of the invention is to provide a fastening of a cylinder end piece to a cylinder which avoids the above-mentioned disadvantages.

This object is achieved by providing a second annular recess in the outer surface of the cylinder end piece and an annular recess in the inner peripheral surface of one end of the cylinder so as to face the second annular recess. .

In the shock absorber assembly work, a recess is provided on the inner circumferential surface of one end of the cylinder at a position where the annular spring fitted in the second annular recess on the outer circumferential surface of the cylinder end piece is finally brought. Since the diameter of the spring in the free position is larger than the inner diameter of the cylinder at the location of the annular recess (the first conical surface provided at one end of the cylinder and the opposite cylinder end) The annular spring can be expanded within the recess in the inner circumferential surface of the cylinder at the moment when the elastic sealing ring located with the first annular recess provided in the piece is brought under the necessary sealing pressure.

The structure according to the invention does not require disassembly of the buffer by normal means after the buffer is completed and at the same time does not require a thread.

Moreover, assembly can take place by pure axial translation, so no rotation is necessary.

In this invention, the outer circumferential surface of the cylinder end piece is inserted into the one end of the cylinder, and the inner circumferential surface of the one end of the cylinder is provided with an annular recess, and the recess is provided with a second groove provided on the outer circumferential surface of the cylinder end piece. When the annular spring fitted in the annular recess reaches the annular spring, the diameter of the annular spring expands and enters the annular recess provided on the inner circumferential surface of one end of the cylinder, and the annular recess is sealed with an elastic packing ring. Characterized by being located in a place that is under pressure.

According to this invention, the annular recess provided on the inner circumferential surface of one end of the cylinder has a top flange and a second conical surface connected to the flat annular surface, so that the annular recess is directed in the axial direction of the piston. When a force is applied to the cylinder end piece, the annular spring slides together with the cylinder end piece in a recess in one end of the cylinder in the axial direction of the piston and extends from the flat annular surface to a second conical surface continuous therewith. Move to.

Then, when the annular spring moves on the inclined surface of the conical surface, it contracts and exerts an urging force that presses the cylinder.

This biasing force is caused by the screw I of the cylinder end piece against the cylinder.
- Acts on the cylinder end piece as a component force that prevents the cylinder from moving in the axial direction.

At the same time, the cylinder end piece moves so as to press the packing ring made of an elastic member, so that the packing ring acts to inhibit movement of the cylinder end piece.

Therefore, according to the present invention, due to the synergistic effect of the annular spring and the packing ring, the movement of the cylinder end piece is suppressed without being damaged by a force that is suddenly applied locally.

The invention will be further described with reference to embodiments illustrated in the accompanying drawings, in which: FIG.

Referring to the drawings, a cylinder 1 is provided with a cylinder end piece 2 through which a piston rod 3 extends and is sealed with a packing ring 4 of the piston rod.

The cylinder end piece 2 is provided with a flange 5, while in one end of the cylinder 1, adjacent to the cylinder end face 7, a first conical surface 8 is provided.

A flange 5 of the cylinder end piece 2 having an engagement surface facing the end face of the cylinder, a first annular recess 6 provided adjacent thereto, a cylinder end face γ and a first conical cone located within one end of the cylinder. Packing ring 9 between surface 8
is located.

The cylinder 1 further comprises an annular recess 11 having a second conical surface 12 and a stop.

A ring-shaped spring 13 is disposed in both the second annular recess 10 provided in the outer circumferential surface of the cylinder end piece 2 and the annular recess 11.
is located.

The cylinder end piece is fastened to the cylinder in the following manner.

The cylinder end piece 2 is provided with a packing ring 9 and an annular spring 13, which spring has a diameter greater than the diameter of the recess 11 in the cylinder 1 in the free position.

The cylinder end piece 2 is introduced into the cylinder 1 in which the spring 13 is reduced in diameter by the first conical surface 8 and forced into said second annular recess 10 .

The packing ring 9 is already compressed near the end position of the cylinder end piece 2.

The packing ring 9 has limited opportunity to expand and contract within the gap between the flange 5 of the cylinder end piece 2 and the cylinder end face 1.

After the second annular recess 10 and the annular recess 11 are in a position facing each other, the annular spring 13 partially enters the recess 11.

The resiliency of the packing ring 90 provides a near-immovable connection between the cylinder end piece 2 and one end of the cylinder 1.

The cylinder end piece cannot be removed from the buffer without damaging the parts.

[Brief explanation of the drawing]

The figure is a partial longitudinal cross-sectional view of a shock absorber according to the invention. 1... Cylinder, 2... Cylinder end piece, 3... Piston rod, 4... Piston rod packing ring, 7... Cylinder end face, 8... First conical surface, 9...
Packing ring, 10...Second annular recess, 1
1... Annular recess, 12... Second conical surface, 13... Annular spring.

Claims (1)

[Claims] 1 a cylinder, a piston movable within the cylinder and having a piston rod; a first conical surface formed at one end of the cylinder; a first annular surface facing the first conical surface; a cylinder end piece located within a recess and one end of the cylinder and having an outer circumferential surface facing an inner circumferential surface of the cylinder and through which the piston rod passes, and between the first annular recess and the conical surface of the cylinder; established,
A packing ring made of an elastic material is provided, and a second annular recess that is continuous with the first annular recess is provided on the outer peripheral surface of the cylinder end piece and faces the second annular recess. An annular recess continuous to the conical surface is provided on the inner peripheral surface of one end of the cylinder, and the annular recess has a locking surface and a flat annular surface part and a second conical surface formed continuously thereto. a conical surface, the flat annular surface being disposed facing a second annular recess in the cylinder end piece, the annular recess formed in the cylinder and the second annular recess formed in the cylinder; A common ring-shaped spring is provided at the cylindrical portions, the outer diameter of which in the free position is larger than the inner diameter of the cylinder, and the spring is arranged to press against the flat annular surface of the cylinder when the cylinder end piece is installed in the cylinder. and the annular recess formed in the cylinder and the second annular recess are located relatively close to the installation position of the packing ring, and when the packing ring is under sealing pressure, the annular spring are securely held within the facingly disposed annular recess and the second annular recess to maintain the backing ring at a desired sealing pressure under constant compression. buffer.