| 摘要 |
<p>A crawler (7), comprising a metal bush (11) and a connection pin (13), wherein surface hardened layers (12) and (14) formed of compound layers of a nitride with a hardness higher than that of sediment are formed on the inner peripheral surface (11B) of the metal bush and the outer peripheral surface (13A) of the connection pin, respectively, resin sliding bearings (15) formed of an ultrahigh molecular weight polyethylene based resin are fitted onto the right and left side inner peripheral surfaces of the metal bush (11) apart from each other, and a plurality of recessed grooves (16) formed of elongated grooves extending axially on the inner peripheral side are provided in the resin sliding bearings (15), whereby a part of the sediment invaded into a clearance between an outer link part (9) and the metal bush (11) through an annular seal (17) is buried into the inner peripheral surfaces (15A) of the resin sliding bearing (15), and the remaining sediment is arrested to the inside of the recessed grooves (16).</p> |
