JPS6220758Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly comprises a hydraulic shock absorber used in a suspension system of a motorcycle, in particular, an outer cylinder connected to an upper connecting member, a hydraulic cylinder connected to a lower connecting member and raised and lowered within the outer cylinder, The present invention relates to a device having a telescopic boot stretched between the outer cylinder and the hydraulic cylinder so as to cover the exposed portion of the hydraulic cylinder.

In this type of shock absorber, at the opening of the hydraulic cylinder,
An oil seal is installed to prevent the buffer oil inside from leaking, but some oil seals may ooze oil due to aging, etc., and this oil ooze is to the extent that it interferes with the buffer function. However, it stains the buffer and its surrounding area, damaging its aesthetic appearance.

The present invention was proposed in view of the above, and allows the oil exuding from the hydraulic cylinder to be guided and discharged to an appropriate location, thereby preventing contamination caused by the oil, and at the same time, preventing dust and dirt from entering the hydraulic cylinder. It is an object of the present invention to provide an effective buffer that can be used.

In order to achieve the above object, the present invention connects a conduit that communicates the inside of the boot with the atmosphere to an extensible boot that covers the exposed part of a hydraulic cylinder, and connects the conduit to the conduit that communicates the inside of the boot with the atmosphere.
It is characterized by being equipped with a filter element that allows air and oil to flow.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the front end of a rear fork 1 is pivoted 2 to a body frame B of a motorcycle so as to be able to swing vertically. This rear fork 1 is the second
As shown in the figure, a pair of left and right fork legs 3, 3
, a bearing cylinder 4 that integrally connects the front ends of these fork legs 3, 3, and a cross member 5 that integrally connects the intermediate portions of these fork legs 3, 3, and a rear end of both fork legs 3, 3. A rear wheel W is mounted on an axle at the end.

The above four constituent members 3, 3, 4 of the rear fork 1,
5 through the space surrounded by the hydraulic shock absorber D of the present invention.
are arranged in the vertical direction, and the upper connecting member 6 thereof is pivoted 7 to the single frame B so as to be swingable back and forth. Further, below the rear fork 1, the front end of the first link 8 is pivotably supported 9 on the body frame B so as to be able to swing vertically, and the rear end of the second link 10 is also pivotably supported vertically at the intermediate portion of the rear fork 1. The lower connecting member 13 of the buffer D is pivotally supported 11, and the free ends of both links 8 and 10 are pivotally connected 12, and the lower connecting member 13 of the shock absorber D is pivoted to a protruding arm 10a that projects upward and forward from the free end of the second link 10. Arrived 14th. Therefore, the first
As the rear fork 1 swings upward, the second links 8 and 10 work together to move the shock absorber D.
This characteristic of the shock absorber D has a positive effect on the ride comfort of the vehicle.

Now, to explain the structure of the hydraulic shock absorber D with reference to FIGS. 3 and 4, the upper connecting member 6 has an outer cylinder 1
5, and a hydraulic cylinder 16 that moves up and down within the outer cylinder 15 is fixed to the lower connecting member 13, respectively. The hydraulic cylinder 16 is filled with buffer oil as usual in the past, and a piston (not shown) with a piston rod connected to the upper connecting member 6 is slidably connected to the upper connecting member 6, and by their cooperation, both connecting members 6, 13 is designed to be able to damp the relative vertical movement between the two.

An oil seal 17 that contacts the outer periphery of the hydraulic cylinder 16 is fixed to the lower inner wall of the outer cylinder 15, and a bellows-type retractable boot 18 that covers the lower exposed part of the hydraulic cylinder 16 connects the outer cylinder 15 and the hydraulic cylinder 16. is stretched between the lower ends of the

The upper end of a flexible conduit 19 made of a rubber tube or the like is connected to the bottom of the telescopic boot 18, and the lower end thereof is connected to a discharge pipe 20 attached to the first link 8, whereby the interior of the telescopic boot 18 is vented to the atmosphere. communicate. A filter cylinder 22 filled with a filter element 21 is interposed in the middle of the conduit 19, and the filter element 21 allows air and oil to flow therethrough.

If the buffer oil leaking from the upper part of the hydraulic cylinder 16 accumulates in the outer cylinder 15 and leaks from the seal portion of the oil seal 17, it will flow into the telescopic boot 18 and then the conduit 19. It descends, passes through the filter element 21, and is discharged from the exhaust pipe 20 to the outside of the vehicle body.

When the shock absorber D is in operation, the hydraulic cylinder 16 moves up and down inside the outer cylinder 15, so the telescopic boot 18 expands and contracts, and accordingly, the inside of the boot can breathe through the conduit 19, the filter element 21, and the discharge pipe 20. Therefore, an excessive pressure change does not occur inside the boot, and its rupture can be prevented. Further, when the telescopic boot 18 sucks air into the inside, if the air contains dust, dirt, etc., the filter element 21 removes them and prevents them from entering the inside of the boot 18.

As described above, according to the present invention, the hydraulic cylinder 1
The conduit 1 is inserted into the telescopic boot 18 that covers the exposed part of the conduit 1.
9 to the atmosphere, and the buffer oil leaking into the telescopic boot 18 is guided to the appropriate place by the conduit 19 and discharged, so that the buffer oil and its surroundings are not contaminated by the buffer oil. , their beauty can be maintained. In addition, the conduit 19 includes a filter element 2 that allows air and oil to flow therethrough.
1, this filter element 21
This can prevent external dust from entering into the telescopic boot 18 without hindering the discharge of buffer oil from the telescopic boot 18 and the breathing of the telescopic boot 18, and therefore prevents the telescopic boot 18 from bursting. At the same time, always keep the inside of the outer cylinder clean.
It is possible to improve the durability of the sliding part within the housing. Moreover, by locating the open end of the conduit 19 in a place with little dust, the filter element 2
This can reduce the burden on the device and extend its lifespan.

[Brief explanation of the drawing]

Figure 1 is a side view of the main parts of a motorcycle equipped with the shock absorber of the present invention, Figure 2 is a plan view of the same, Figure 3 is an enlarged vertical side view of the main parts of the hydraulic shock absorber of Figure 1, and Figure 4 is Third
It is an enlarged sectional view of the part shown in the figure. D...Hydraulic shock absorber, 6...Upper connecting member, 13
... Lower connecting member, 15 ... Outer cylinder, 16 ... Hydraulic cylinder, 18 ... Telescopic boot, 19 ... Conduit,
21...Filter element.

Claims (1)

[Scope of utility model registration request] An outer cylinder 15 connected to the upper connecting member 6, a hydraulic cylinder 16 connected to the lower connecting member 13 and moving up and down within the outer cylinder 15, and an exposed part of the hydraulic cylinder 16 located between the outer cylinder 15 and the hydraulic cylinder 16. In a hydraulic shock absorber having a telescopic boot 18 stretched so as to enclose the telescopic boot 18,
A hydraulic shock absorber characterized in that a conduit 19 is connected to the inside thereof to communicate with the atmosphere, and a filter element 21 is interposed in the conduit 19 to allow air and oil to flow therethrough.