公开(公告)号：US20170166269A1

公开(公告)日：2017-06-15

申请号：US15422430

申请日：2017-02-01

Applicant: KYB Corporation

Inventor： Yoshikazu HIROTA ,  Chikashi IMOTO ,  Kazumi ITO ,  Junichiro SUGIMOTO ,  Eishin NOGUCHI ,  Kaori KAWABATA

IPC: B62D55/088 ,  F16J15/3204 ,  F16J15/00 ,  F16J15/34

CPC classification number: B62D55/088 ,  F16J15/002 ,  F16J15/008 ,  F16J15/3204 ,  F16J15/344 ,  F16J15/3464

Abstract: A seal structure is provided to block a clearance between a rotational casing and a fixed housing for driving a crawler of a crawler vehicle. A seal ring is held in a first annular holding groove provided in the fixed housing together with a first O-ring that biases the seal ring toward the outside of the first holding groove. A second holding groove having an opening facing the first holding groove is provided in the rotational casing to hold a slide ring having a higher rigidity than that of the seal ring together with a second O-ring that biases the slide ring toward the seal ring. A foreign object such as mud is thereby prevented from invading a gear chamber without increasing a frictional loss.