| 摘要 |
<p>A valve device for driving suction and exhaust valves of an engine comprises a roller shaft (9) mounted in a recess (5) of a rocker arm body (1) (or a tappet body (21)), which serves as a valve device body, a cylindrical-shaped bush (3) rotatably supported on the roller shaft (9), a roller (2) rotatably supported on an outer periphery of the bush (3) to face a cam (11), and a lubricating film (A) provided on respective surfaces (12, 13) of the bush (3), which slide on the roller shaft (9) and the roller (2), the lubricating film (A) enabling smooth motions over a long term without losing a lubricating property of the sliding surfaces (12, 13) of the bush (3) even when supply of a lubricating oil is insufficient as during an initial stage of engine running.</p> |
