JPH088360Y2 - Hydraulic shock absorber valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a valve device for a hydraulic shock absorber, which is interposed between a vehicle body and an axle in a vehicle such as an automobile or a motorcycle and which damps vibrations from a road surface.

[Conventional technology]

In this type of conventional hydraulic shock absorber, as shown in FIGS. 3 and 4, a piston rod 4 is movably inserted into a cylinder 2 via a piston 5, and the piston 5 has a pressure port 10a and an extension. A port 10 is formed, a pressure side valve 6 is openably and closably provided at the upper end of the pressure port 10a, and an extension side valve 7 composed of a plurality of leaf valves is openably and closably provided at the mouth end of the extension port 10. What has been developed. This hydraulic shock absorber is used as a damper alone or as a front fork with a built-in damper.

Each of the leaf valves a, b ... N is formed in a non-annular shape, and a piston rod insertion hole 11 having a locking surface 11a is formed in the center thereof, and the end portion of the piston rod 4 having a locking surface 4a in the insertion hole 11 is formed. Of the leaf valves a, b
... n is held between the end seat surface 3 of the piston 5 and the support 12, and the piston rod 4 penetrating the piston rod insertion hole 14 of the support 12 is fastened by the valve retainer 8 and nut 13.

As mentioned above, the outer periphery of the leaf valves a, b ...
When it is formed in a non-annular shape such as an oval type, the piston seat surface 3 must be provided so that the flexure portion always faces the port 10.
It is necessary to position the leaf valves a, b ... Therefore, the locking surface 4a perpendicular to the piston 4 is formed,
Insertion hole 2 for piston 5 and insertion hole 1 for leaf valves a, b ... n
The same locking surfaces 2a and 11a are formed on the inner circumference of the piston 1, and the piston 5 and the leaf valves a, b ...
n is prevented from rotating.

[Problems to be solved by the device]

However, the valve device in which the leaf valve is non-annular as described above and in which the locking surfaces 2a and 11a are formed at the centers for positioning has the following problems.

Positioning in the direction of rotation is the piston 5 or leaf valve
Since it is close to the center of a, b ... n, a slight manufacturing error of the positioning part is increased in the outer peripheral part of the leaf valve, and the error in the rotational direction between the piston seat 3 and the leaf valves a, b ... n causes the variation in damping force characteristics. It is easy to become.

The engaging surface 4a must be formed also on the piston rod 4 that holds the piston 5 and the leaf valves a, b ... N, and its molding is troublesome and difficult, and the strength is also reduced.

Therefore, the purpose of the present invention is to prevent variations in damping force characteristics due to the non-annular shape of the leaf valve,
It is an object of the present invention to provide a valve device of a hydraulic shock absorber that can be easily molded.

[Means for solving the problem]

To achieve the above object, the structure of the present invention is such that a piston rod is movably inserted into a cylinder through a piston, a port is provided at the piston, and a non-annular leaf valve is provided at the outlet of the port so that the leaf valve can be opened and closed. , A piston rod that penetrates the piston is inserted into the piston rod insertion hole in the center of the leaf valve, and the leaf valve is held by a holding member against the seat surface of the piston. Provide a locking surface on the side of the surface,
A valve holder is arranged at the outer end of the leaf valve, and an engaging portion that engages with the engaging surface is provided at the end of the valve holder, and the valve holder holds down the leaf valve accommodated in the valve holder and engages. It is characterized in that the stopper is locked to the locking surface of the piston seat surface.

[Operation] A non-annular leaf valve is brought into contact with the seat surface of the piston, and while the leaf valve is housed and pressed into the valve holder, the engagement portion of the valve holder engages with the engagement surface on the side of the seat surface of the piston. When stopped, the leaf valve and the valve holder are held on the piston side, the leaf valve is hooked on the locking portion to prevent rotation, and the displacement of the bending portion of the leaf valve with respect to the port is prevented.

〔Example〕

 An embodiment of the present invention will be described below.

 FIG. 1 shows an embodiment of the present invention.

 The hydraulic shock absorber has the same structure as the conventional one.

At the outlet of the expansion port 10 which is the port of the piston 5, an expansion valve 7 which is a valve composed of one or more leaf valves a ′, b ′ ... The end of the penetrating rod 4 penetrates the central piston rod insertion hole 16 of each leaf valve a ', b' ... n '. Piston rod 4 is support washer 15
Through the holes 17 and 19 of the valve holder 18 and the nut 13
Are tightened with each leaf valve a ', b' ...
n'is held between the seat surface 3 of the piston 5 and the rectangular support washer 15.

Insertion hole 16 of piston 5 and each leaf valve a ', b' ...
The n'insertion hole 16 and the holes 17 and 19 are formed in a perfect circular shape, and the piston rod 4 is formed in a cylindrical shape.

The seat surface 3 of the piston 4 projects slightly outward,
The locking surface 20 is formed on the side portion thereof. The locking surface 20 may be molded as the inlet end when molding the pressure port 10a, or may be molded independently of the pressure port 10a. The locking surface 20 may be a vertical surface as shown or may have another shape.

The valve holder 18 has a U-shaped cross section, and has bent portions which are locking portions 21 formed on both sides of the main body.

Each leaf valve a ', b' ... on the seat surface 3 of the piston 5
n'is abutted and the leaf valves a ', b' ... n 'are pressed by the support washers 15, and each of these members is attached to the valve holder 18
When the nut 13 is tightened while being housed between the engaging portions 21, 21, the engaging portions 21, 21 engage with the engaging surfaces 20, 20 on both sides of the seat surface 3. Therefore, even if the leaf valves a ', b' ... n 'are non-annular and the piston rod insertion hole 16 is a perfect circle, the leaf valves a', b '... n' are pulled to the engaging portions 21,21. It is hung and does not rotate, and displacement of the bending portion with respect to the extension port 10 is prevented.

The locking portion of the valve holder 18 may be a claw, a step, etc.,
In short, each leaf valve a ′,
It suffices if it is arranged so as to prevent the displacement of b '... n'.

Although the above-mentioned valve device describes the expansion side valve, it can be applied to the compression side valve provided at the outlet end of the pressure port.

The insertion hole 16 is a perfect circle, but other general holes may be used.

Since the support washer 15 is used as a support member having a great influence on the damping force characteristic, the valve holder 18 may be positioned with high accuracy.

FIG. 2 relates to another embodiment of the present invention, in which a support washer 15 'is formed into a ring shape having a hole 17, and other structure, action and effect are the same as those of the embodiment of FIG. Is the same. Therefore, the same structures are denoted by the same reference numerals and omitted in detail.

[Effect of device]

 The present invention has the following effects.

The valve holder presses the leaf valve housed inside and locks the locking part with the locking surface of the seat surface, so the leaf valve is supported by the locking part and is prevented from moving in the rotational direction, and the piston There is no displacement of the bending portion with respect to the port, and variations in damping force characteristics do not occur.

The structure is simple because it is not necessary to provide a special locking means in the piston or piston insertion hole by providing the locking part at the end of the valve holder and molding the locking surface on the side of the seat surface. Molding is also easy.

[Brief description of drawings]

1 and 2 are exploded perspective views of a valve device according to each embodiment of the present invention, FIG. 3 is a partially cutaway sectional view of a conventional hydraulic shock absorber, and FIG. 4 is an exploded view of a conventional valve device. It is a perspective view. 2 ... Cylinder, 3 ... Seat surface, 4 ... Piston rod, 5 ... Piston, 10 ... Port, 15 ... Support washer, 16 ... Piston rod insertion hole, 18 ... Valve holder, 20 ... Stop face, 21 ... Locking part, a ', b' ... n '
...... Leaf valve.

Claims (2)

[Scope of utility model registration request] 1. A piston rod is movably inserted into a cylinder via a piston, and a port is provided in the piston.
A non-annular leaf valve is provided at the outlet of this port so that it can be opened and closed, and a piston rod that penetrates the piston is inserted into the piston rod insertion hole in the center of the leaf valve, and the leaf valve is sandwiched with respect to the seat surface of the piston. In a hydraulic shock absorber that is being held between, the locking surface is provided on the side of the seat surface of the piston, the valve holder is arranged at the outer end of the leaf valve, and the locking surface is provided at the end of the valve holder. A valve for a hydraulic shock absorber, comprising a locking portion for locking, wherein the valve holder holds the leaf valve housed in the valve holder and locks the locking portion with the locking surface of the piston seat surface. apparatus. 2. A valve device for a hydraulic shock absorber according to claim 1, wherein a support washer is interposed between the leaf valve and the valve holder.