| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent early wear of the slide surfaces of a boss member and a mating member due to penetration of soil. SOLUTION: By inserting a shim 37 is inserted in a space between a bracket 24 and a holder 30, adhesion of a lip seal 32, located between the flange part 25A of a bush 25 with a flange and a holder 30, to the holder 30 is regulatable. This constitution seals the slide surfaces of the flange part 25B and the holder 30 by a lip seal 32 with optimum sealing ability, resulting in reliable prevention of penetration of soil during an excavation work to the slide surfaces of the flange part 25B and the holder 30.</p> |
