SEAL STRUCTURE FOR ENDLESS TRACK DRIVE DEVICE

摘要

Provided is a seal structure for insulating a gap between a fixed housing and a rotating casing for driving an endless track of an endless-track vehicle. A seal ring received in an annular first receiving groove provided in the fixed housing, and a first O-ring for urging the seal ring in the direction of pushing out from the first receiving groove are accommodated. A slide ring having higher rigidity than the seal ring, and a second O-ring for urging the slide ring toward the seal ring are accommodated in a second receiving groove provided in the rotating casing and opening opposite the first receiving groove. By this configuration, penetration of foreign matter such as mud into a gear chamber is prevented without significant frictional loss.