Crawler

A crawler belt including endlessly connected right and left track links each formed with an outer link portion and an inner link portion at opposite longitudinal ends thereof, bushes transversely located between said right and left track links in such a way as to connect inner link portions of the respective track links with each other, connecting pins inserted in said bushes and having opposite end portions fitted in and connected to said outer link portions of the respective track links, and seal members fitted on circumferential surfaces of said connecting pins at positions between said outer link portions of said track links and said bushes, characterized in that said crawler belts comprises:

• a sliding bearing receptacle groove provided on and around an inner peripheral surface of each bush, and said sliding receptacle groove having a diameter larger than said inner peripheral surface;
• a hardened surface layer provided at least on an inner peripheral surface of said bush or on an outer peripheral surface of said connecting pin to impart higher hardness thereto;
• and
• a resinous sliding bearing formed of a tubular synthetic resin material lower in hardness than said bush and fitted in said sliding bearing receptacle groove of said bush, said resinous sliding bearing having a slide surface on the inner peripheral side thereof in sliding contact with said connecting pin.