| 摘要 |
<p>In a tensioner (1) having a plunger (8) slidably fitted into a plunger accommodation hole (12) in a tensioner housing (7) with the front end portion of the plunger (8) biased outward so as to be protruded, the tensioner housing (7) is formed of a cast product or an aluminum base metallic material, the plunger accommodation hole (12) is not subjected to surface treatment and the plunger (8) is subjected to surface treatment, which forms a crystalline manganese phosphate film.</p> |
