| 摘要 |
PURPOSE:To enhance the heat radiating effect of frictional heat in the captioned coupling by making opening air holes, which open to the outside, in the solid part between a hole and another hole, so that the solid part is cooled by an air flow passing through the air holes. CONSTITUTION:A projected piece 40 of the first main body 1 is fitted into holes 53 and 53 of a through hole 5 in a freely slidable manner, while a projected piece 40 of the second main body 2 is fitted into holes 54 and 54. In the fitted part, relative sliding movement occurs between an intermediate body 3 and the first or second main body, thereby causing frictional heat. However, since air holes 31 are provided in the solid part between the hole 53 and the hole 54 that are made in the intermediate body 3 in the circumferential direction, the solid part is cooled by the air flow passing through the air hole 31. As a result, the heat radiating effect can be enhanced.
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