Hitachi Construction Machinery Co., Ltd.

Yoshiaki Sekiguchi

Genroku Sugiyama

Hideki Akita

Kazuyoshi Hatano

Wataru Idetsu

A seal () is constituted by an outer lip portion () to be held in abutting engagement with an outer link portion () of a crawler belt (), an inner lip portion () to be held in abutting engagement with a bush (), and an interconnecting bridge portion () bridged and connected between the outer and inner lip portions (). The outer lip portion () on the side of track link, the inner lip portion () on the side of bush, and outer bridge portion (A) and inner bridge portion (B) of the interconnecting bridge portion () are formed in thicknesses (T, T, T' and T&#x2032;), respectively, which are in the relations of (TT&#x2032;&#x3e;T&#x2248;T&#x2032;). A maximum outside diameter portion (C) of the interconnecting bridge portion () is located radially outward of a median point between inner and outer peripheral ends of the lip portion () on the side of bush. The inner lip portion () as a whole is uniformly pressed against an end face (A) of the bush () by the interconnecting bridge portion ().

Crawler belt and seal for use therein

The present invention concerns a crawler belt ( ) incorporating a sealing devices ( ), which are each constituted by a coned disc spring ( ) and a seal ring ( ), to seal up gap spaces between track links ( ) and bushes ( ). A seal anchor hole ( ) is provided in each one of outer link portions ( ) of track links ( ) of the crawler belt ( ), and the sealing device ( ) is fitted in the seal anchor hole ( ) between an outer link portion ( ) and an opposing end face ( A) of a bush ( ). The sealing device ( ) includes the seal ring ( ) in the shape of an O-ring, and the coned disc spring ( ) which is arranged to press the seal ring ( ) resiliently against peripheral wall surface ( B) of the seal anchor hole ( ) and the end face ( A) of the bush ( ).

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Yasato-machi, Japan

Yoshiaki Sekiguchi