| 摘要 |
PROBLEM TO BE SOLVED: To suppress failure of a drum main body and a sideface cover and suppress leakage of a lubricating oil in a drum so as to smoothly operate a travel motor unit for a long period. SOLUTION: Plural boltholes 23 on the inside diameter side and plural boltholes 24 on the outside diameter side are provided in an opening part end face 22B of the drum main body 22, the sideface cover 25 is tightened to the drum main body 22 using bolts 26 on the inside diameter side screwed into the boltholes 23, and a protecting cover 28 is tightened to the drum main body 22 using bolts 29 on the outside diameter side screwed into the boltholes 24, so as to protect the sideface cover 25 by the protection cover 28. The cover 25 and the bolts 26 are thereby prevented, by the protection cover 28, from colliding with stones, rocks and the like, so as to suppress the failure of the drum main body 22 and the cover 25 and the leakage of the lubricating oil in the drum 21 to the outside, and the travel motor unit 11 is smoothly operated thereby for the long period.
|
