JPS6318844Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lubricating device for a hydraulic shock absorber that can reduce the sliding resistance of the inner and outer cylinders of a hydraulic shock absorber in which the inner and outer cylinders are slidably fitted together.

Hydraulic shock absorbers, which are made by slidably fitting an inner and outer cylinder and sealing oil inside, are used, for example, as shock absorbers for the front wheels of motorcycles. Bushes are fitted to slide on the inner and outer cylinders to reduce sliding resistance, oil seals scrape off oil adhering to the inner and outer cylinders, and dust seals are installed to prevent dust from entering from the outside. However, these elements interact with each other and act as sliding resistance on the inner cylinder, impeding the shock absorber's original buffering ability.
In order to suppress this as much as possible, a hydraulic shock absorber is known in which a lubricating member made of an elastic body impregnated with a lubricant such as grease is provided between an oil seal and a dust seal.

However, in the hydraulic shock absorber equipped with a lubricating member, in the initial stage of use, it may be effective in protecting the oil film between the inner and outer cylinders and reducing sliding resistance.
As the usage time increases, there is a problem in that the lubricant disappears from the sides of the elastic body surface of the lubricating member that are in contact with the inner and outer cylinders, and the surface becomes dry and loses its lubricating function.

The inventor of the present invention has repeatedly devised ways to solve this problem, and achieved his goal by providing a space between the lubricating member and the dust seal, and slidably fitting the inertial member onto the lubricating member. The present invention was created in recognition of the fact that it could be obtained.

Next, embodiments of the present invention will be described based on the accompanying drawings. FIG. 1 is a sectional side view of a main part of an embodiment of the device of the present invention.

1 is an inner cylinder of the shock absorber, and 2 is an outer cylinder of the shock absorber, which is slidably fitted to the outer periphery of the inner cylinder 1. Reference numeral 3 denotes a dust seal, which is made of an elastic material and is attached to the tip of the open end of the outer cylinder 1 so as to seal the open opening. It slides on the inner cylinder 1 along with the movement of. Reference numeral 4 denotes an oil seal, which is installed between a circlip 5 and a spacer 6, which are attached at intervals so as to be able to slide on the outer periphery of the inner cylinder 1. It slides on the cylinder 1, scrapes off oil adhering to the inner cylinder 1 and outer cylinder 2, and prevents oil from leaking. Reference numeral 7 denotes a lubricating member, which is a porous elastic body impregnated with a lubricant such as grease. A space 9 is provided between the circlip 5 and the dust seal 3, and the outer cylinder 2
It is fitted so that it can slide on the inner tube 1 as the tube moves. The lubricating member 7 has openings 10 not only in contact with the outer periphery of the inner cylinder 1 over the entire inner periphery of the elastic body 8, but also in several places as shown in FIGS. 2 and 3 as another embodiment. For example, the elastic body 8 may be wrapped with an outer skin 11 made of synthetic resin so as to be in contact with the outer periphery of the inner cylinder 1. Reference numeral 12 denotes an inertial member, which is attached to the lubricating member 7 with a space 9 between it and the dust seal 3 so that it can freely slide up and down. Formed from a certain material.

Since the device of the present invention is configured as described above,
When the hydraulic shock absorber operates and the inner and outer cylinders slide, the inertial member 12 acts as a weight and hits the lubricating member 7 as it moves up and down, so the lubricant impregnated in the elastic body 8 is completely absorbed. The lubricant is squeezed out and applied to the outer circumference of the inner cylinder 1, ensuring good lubricity at all times, and even if the usage time increases, only the surface of the elastic body 8 will not dry out, and the lubricant inside will be squeezed out. It remains moist forever, and almost all of the impregnated lubricant is effectively utilized.

In the present invention, a space is provided between the lubricating member and the dust seal, and the inertial member is fitted therein, so that an appropriate lubricant is always applied to the sliding surfaces of the inner and outer cylinders, and an increase in sliding resistance can be suppressed. , significant effects are recognized, such as the ability to effectively utilize almost the entire amount of lubricant in the lubricating member.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the main part showing one embodiment of the device of the present invention, FIG. 2 is a side sectional view of the main part showing another embodiment of the lubricating member used in the present invention, and FIG. Second
FIG. 3 is a cross-sectional view of the lubricating member in the figure. 1... Inner cylinder, 2... Outer cylinder, 3... Dust seal, 4... Oil seal, 5... Circlip,
6... Spacer, 7... Lubricating member, 8... Elastic body, 9... Space, 10... Opening, 11... Outer skin, 12... Inertial member.

Claims (1)

[Scope of utility model registration request] The inner and outer cylinders are slidably fitted, oil is sealed inside, a dust seal and an oil seal are attached to the open end of the outer cylinder so that they can slide against the inner cylinder, and a lubricating member is placed between the dust seal and the oil seal. A lubrication device for a hydraulic shock absorber, in which an inertial member 12 is slidably fitted between a dust seal 3 and a lubricating member 7 with a space 9 provided therebetween.