Crawler belt and sealt for use therein

Abstract

A seal ( 21 ) is constituted by an outer lip portion ( 22 ) to be held in abutting engagement with an outer link portion ( 9 ) of a crawler belt ( 7 ), an inner lip portion ( 23 ) to be held in abutting engagement with a bush ( 11 ), and an interconnecting bridge portion ( 24 ) bridged and connected between the outer and inner lip portions ( 22, 23 ). The outer lip portion ( 22 ) on the side of track link, the inner lip portion ( 23 ) on the side of bush, and outer bridge portion ( 24 A) and inner bridge portion ( 24 B) of the interconnecting bridge portion ( 24 ) are formed in thicknesses (T 1 , T 2 , T 1 ' and T 2 '), respectively, which are in the relations of (T 2≈ T 2 '>T 1 ≈T 1 '). A maximum outside diameter portion ( 24 C) of the interconnecting bridge portion ( 24 ) is located radially outward of a median point between inner and outer peripheral ends of the lip portion ( 23 ) on the side of bush. The inner lip portion ( 23 ) as a whole is uniformly pressed against an end face ( 11 A) of the bush ( 11 ) by the interconnecting bridge portion ( 24 ).

Description

technical field [0001] The present invention relates to a crawler suitable for crawler vehicles such as hydraulic excavators and hydraulic cranes, and a gasket for the crawler. Background technique [0002] Generally speaking, the crawler belts used on crawler vehicles such as hydraulic excavators are equipped with left and right crawler belt links that form an outer link part on one side in the longitudinal direction and an inner link part on the other side in the longitudinal direction. Between the inner link parts of each of the crawler belt links, the left and right end sides of the bushes facing the outer link parts, and the left and right end sides inserted into the bushes are fitted in the The connecting pins that connect the above-mentioned outer link parts. [0003] The crawler belt of this prior art is wound between the traveling wheel and the driving wheel and is driven by a hydraulic motor for walking to rotate the driving wheel, so that the crawler belt is woun...

AI Technical Summary

Problems solved by technology

[0011] However, for example, during operations such as steering of a hydraulic excavator, the phenomenon that the axial distance between the outer link portion and the bushing temporarily expands frequently occurs.

And at this time, the tip of the gasket often leaves the bushing instantaneously, and the external sand invades between the tip and the bottom of the gasket, and once the sand invades between the tip and the bottom, the sand becomes closed. In the state between the two, there is a problem of wearing the sealing surface due to sand and soil

[0012] In addition, since the pointed part is provided on the flange part on the bushing side, the overall shape of the gasket becomes complicated, and there is also a problem that the workability of the gasket is reduced.

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