TRACK ROLLER DEVICE FOR TRACK-TYPE VEHICLE

摘要

A track roller device for track-type vehicles, that eliminates or reduces leakage of lubricating oil from a gap between a collar and a roller supporting axis, even when there is an increase in thermal load caused by an increase in a weight on the roller supporting axis of the track roller device or an increase in thermal load caused by a change in environmental temperature. The track roller device for track-type vehicles has: the roller supporting axis; a roller rotatably provided on the outer perimeter side of this roller supporting axis; and a pair of floating seals provided on both end sections in the axial direction of the roller. An oil containing chamber for lubricating oil that lubricates between the roller and the roller supporting axis is formed on the inner peripheral side of the substantially center section in the axial direction of the roller. First and second seal means each comprising an O ring are provided on both end sections of the roller supporting axis. The first seal means is positioned further on the outside in the axial direction than the second seal means. The first seal means has better low-temperature characteristics than the second seal means or the second seal means has better high-temperature characteristics than the first seal means.