JPH0541982Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an improvement in a crawler link sealing device for sealing the crawler link of an endless track.

(Technical background of the invention and its problems) Track tracks are constructed by connecting individual shoes to pins, but this type of track is suitable for running on rough ground, wetlands, water, etc. For this reason, the shaft portion of the pin that connects the track shoes is structured to be hermetically sealed.

The sealing structure of the pin part in the conventional crawler track is
As shown in the half cross-section of one side end, a bushing 2 is loosely fitted onto the pin 1 so as to seal the bowl-shaped inner peripheral surface 3a of the link 3 press-fitted into the end of the pin 1. A sealing member 5 is installed in the gap 4 formed between the end surface 2a of the link 3 and the bowl-shaped inner circumferential surface 3a of the link 3.
is interposed.

This sealing member 5 is a bowl-shaped inner peripheral surface 3a of the link 3.
The outer part 6 and the inner part 7 are in close contact with substantially the entire surface of the end 2a of the bush 2, and the outer part 6 and the inner part 7 are generally L-shaped. It has a bent shape. The pin 1 is elastically deformed in response to the pressing force of the bush 2, and seals between the pin 1 and the bush 2.

However, in the structure of the conventional sealing member 5 described above, when a load is received from the bushing 2, the load from the bushing 2 does not act evenly on the sealing member 5, and the inner part 7 of the sealing member 5 As shown by the dashed line in Fig. 3, the sealing surface 7 of the sealing member 5 falls down at the point A as a boundary, thereby causing the sealing surface 7 of the sealing member 5 to
A will be unevenly worn with the peak at the point A.

When such uneven wear occurs, the necessary deformation allowance for the seal member 5 is insufficient, and the load and surface pressure to maintain sealing performance are insufficient.
There is a possibility that the ability of the seal member 5 to follow the deformation may be impaired.

Further, due to such a decrease in the performance of the sealing member 5, there is a risk that dirty water and dust may enter the shaft portion of the pin from the outside, possibly causing breakage of the pin.

(Purpose of the invention) The present invention was made to solve the drawbacks and problems associated with the conventional technology described above. It is an object of the present invention to provide a sealing device for a crawler link that is stable and ensures lubricity.

(Summary of the invention) In order to achieve the above object, the present invention has a bowl-shaped inner circumferential surface of a link press-fitted into the end of a pin, and a link that is provided to close this bowl-shaped inner circumferential surface and that is attached to the pin. An elastic sealing member is interposed between the end face of the bush which is loosely fitted into the bushing, and this sealing member has an inner part that is in close contact with the end face, and an outer part that is in contact with the bowl-shaped inner circumferential surface. and a sealing device for a crawler track link having a bent structure such that a gap is created between the bowl-shaped inner circumferential surface and the inner part, wherein a pressing force of the bushing is applied to an end surface of the inner part on the side of the gap. This feature is characterized by the formation of reinforcing ribs that oppose the.

(Function) In this way, with the present invention, the reinforcing rib provided on the inner part deforms the sealing member stably against the pressing force from the bushing without receiving an uneven load, and provides uniform sealing performance over the entire circumference. This means that lubricity can also be ensured.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of essential parts showing an embodiment of the present invention, and the same members as those shown in FIGS. 2 and 3 are designated by the same reference numerals, and their explanations will be omitted.

This crawler link sealing device has a sealing member 5 interposed between the bushing 2 and the link 3.
This sealing member 5 has a half-section bent into a substantially L-shape, and has an outer portion 6 that comes into contact with the bowl-shaped inner circumferential surface 3a.
and the inner part 7 that is in close contact with almost the entire surface of the bush 2a.
It is made up of.

The cross section is bent into a substantially L-shape so that a gap is created between the bowl-shaped inner circumferential surface 3a and the inner part 7, and it deforms with elasticity when the bush 2 is pressurized. The space between the pin 1 and the bush 2 is sealed.

In particular, in this embodiment, one or more reinforcing ribs 7b are provided on the end surface of the inner part 7 on the gap side so that the load from the bush 2 acts uniformly on the entire sealing surface 7a of the inner part 7. It is formed into a shape.

With this configuration, when the load from the bush 2 acts in the vertical direction in the figure to crush the seal member 5, the half cross section of the seal member 5 is bent into an L-shape. This reinforcing rib 7b prevents only the inner part 7 from collapsing even if the
reinforces this inner part 7, and it is crushed almost evenly and stably. Therefore, an uneven load does not occur on the seal member 5, and a uniform load acts on the entire circumference.

Therefore, the surface pressure between the sealing surface 7a of the sealing member 7 and the end surface 2a of the bushing 2 is maintained, preventing muddy water and dust from entering from the outside, and ensuring that the pin 1 does not break. As a result, the lubricating oil applied to the circumferential surface of the pin 1 can be prevented from escaping, and the lubricating performance can be maintained.

[Effects of the invention] As described above, according to the invention, reinforcing ribs are formed on the inner part to resist the pressing force of the bush, which prevents muddy water and dust from entering the pin part and improves lubrication performance. can be maintained and stable sealing performance can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the present invention;
FIG. 2 is a sectional view of a main part of a conventional sealing device, and FIG. 3 is a sectional view of the same sealing member. 1...Pin, 2...Button, 2a...End face,
3... Link, 5... Seal member, 6... Outer part, 7... Inner part, 7a... Seal surface, 7b...
Reinforced ribs.

Claims (1)

[Scope of utility model registration request] A sealing member having elasticity between the bowl-shaped inner circumferential surface of the link press-fitted into the end of the pin and the end surface of a bushing provided to close the bowl-shaped inner circumferential surface and loosely fitted to the pin. The sealing member has an inner part in close contact with the end surface and an outer part in contact with the bowl-shaped inner circumferential surface, and the seal member has a A sealing device for a crawler track link having a bent structure such that a gap is created in the track link, characterized in that a reinforcing rib is formed on an end surface of the inner part on the side of the gap to resist the pressing force of the bushing. Device.