JPH0343478Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a return spring attachment device used in a hydraulic shock absorber, for example, a rebound or compression damping force generating device in a front fork for two- or three-wheeled vehicles.

[Conventional technology]

2. The expansion side or compression side damping force generating device in a hydraulic shock absorber such as a front fork for a tricycle is provided with a port on the piston that communicates two oil chambers, and a leaf valve is provided at the mouth end of this port so that it can be opened and closed. is always biased in the closing direction by a return spring via the disk, and the disk and return spring are vertically movably mounted in a guide cap provided with a plurality of octopus-like foot portions.

[Problem that the invention attempts to solve]

The conventional return spring described above uses a coil spring 1 as shown in FIG. During operation, the coil spring 1 often moves in the rotational direction due to vibrations from the road surface, etc. Therefore, the base end 1a of the coil spring 1 on the guide cap 4 side moves away from the gap 3 between the foot parts 2, 2. It may pop out outside the guide cap 4.
Therefore, the protruding coil spring 1 comes into sliding contact with the cylinder tube, causing malfunction.

It is preferable that the foot portion 2 of the guide cap 4 be as small as possible in order to compensate for the flow rate, but a smaller foot portion 2 means that the gap 3 is larger, making it easier for the coil spring 1 to protrude. There is a problem with getting used to it.

Therefore, the present invention provides a return spring mounting device that prevents one end of a coil spring, which is a return spring, from protruding from a guide cap, regardless of the shape of the guide cap.

[Means for solving problems]

In order to achieve the above purpose, the configuration of the present invention is as follows:
One end of the return spring is held by a disk, and the other end is bent inward while being guided by a guide cap.

[Effect]

Since the end of the return spring is bent inward, the end will not protrude even if the return spring moves in the rotational direction.

〔Example〕

An example of implementing the present invention will be described below with reference to the drawings.

FIG. 1 shows a rebound-side damping force generating device inside the damper in a front fork with a built-in damper.

That is, the piston rod 11 is movably inserted into the damper cylinder 4 via the piston 7,
The piston 7 defines two upper and lower oil chambers 12 and 13 within the damper cylinder 4, and the two oil chambers 12 and 13 communicate through a port 14 provided in the piston 7.

A valve stopper 5, a piston 7, and a collar 9 are inserted into the lower part of the piston rod 11, and each of these members is tightened with a nut 10.

A guide cap 6 is held at the lower part of the flange of the valve stopper 5, and a return spring 3 made of a coil spring, a disk 2, and a leaf valve 1 are inserted into the guide cap 6 so as to be vertically movable.

The leaf valve 1 is disposed at the upper end of the port 14 so as to be openable and closable, and is always biased in the closing direction by a return spring 3 via a disk 2.

The guide cap 6 has a plurality of octopus-shaped foot portions 6a, and a gap 6b is formed between each foot portion 6a to compensate for the flow rate.

A port 2a facing the leaf valve 1 is formed in the disk 2.

The return spring 3 is made of a coil spring, and its lower proximal end abuts the disk 2 and is held by being pressed against the disk 2 by the spring force of the return spring 3 itself. On the other hand, the other end, the upper part 3a, is bent inward, and this upper part 3a abuts against the guide cap 6 by the spring force of the return spring 3 itself, and is guided by the guide cap 6 and always faces inward.

Therefore, even if the return spring 3 moves in the rotational direction due to vibrations from the road surface while the front fork is in operation, the bent upper part 3a will simply be guided by the guide cap 6 and move within the guide cap 6. Therefore, it does not protrude outside the guide cap 6 from the gap 3.

According to the above expansion side damping force generation, when the damper is extended, the oil in the upper oil chamber 12 flows into the gap 6a and the disc 2.
The oil flows out through the port 2a of the leaf valve 1 by bending it downward, and further flows into the lower oil chamber 13 through the port 14 of the piston 7, and at this time, the resistance of the leaf valve 1 generates a rebound damping force.

During compression operation, oil in the lower oil chamber 13 flows to port 14.
The flow further pushes up the leaf valve 1 and the disk 2, and the upper oil chamber 12 flows through the gap and gap 6a created between the leaf valve 1 and the piston 7.
leaks into

The damping force generating device described above can be incorporated into a disc valve and used as a compression side damping force generating device.

Furthermore, instead of having a built-in damper, an inner tube is inserted into the outer tube and a damping force generating device is attached to the inner tube, or it can be used as an extension/compression damping force generating device for a general hydraulic shock absorber.

[Effect of idea]

According to the present invention, the following effects are achieved.

Since the end of the return spring is bent inward while being guided by the guide cap, even if the return spring moves in the rotational direction, this end will not protrude outside the guide cap.

Since the return spring does not protrude outward, it is prevented from restricting the flow rate or jamming the cylinder, ensuring good operation at all times.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a damping force generating device using a return spring attachment device according to an embodiment of the present invention, Fig. 2 is a right side view of the return spring and guide cap, and Fig. 3 is a conventional return FIG. 3 is a side view of the spring and guide cap. 2...Disc, 3...Return spring,
6...Guide cap.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A port is provided on the piston that allows the two oil chambers to communicate, and a leaf valve is provided at the mouth end of this port so that it can be opened and closed, and the leaf valve is connected to a disk installed in the guide cap. In a damping force generator for a hydraulic shock absorber that is always biased in the closing direction by a return spring, one end of the return spring is held by a disk, and the other end is bent inward while being guided by a guide cap. Return spring attachment device. (2) The return spring mounting device according to claim 1, wherein the return spring is a coil spring.