| 摘要 |
Seal sections, which support first and second piston rods, are provided on inner circumferential surfaces of first and second cover members of a cylinder mechanism. A lubricant is supplied via supply passages and oil supply ports to first oil-retaining members, which are installed in installation grooves provided in the seal sections. The lubricant, which has characteristics different from those of an operation oil used for driving a piston of the cylinder mechanism, is retained by the first oil-retaining members. Further, the lubricant is supplied to clearances formed between the first and second cover members and the first and second piston rods, thereby forming an oil film.
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