| 摘要 |
A fitting space having an annular opening, in which an elastic ring whose diameter of a section is D is to be fitted, is formed between a pin-press-fit hole of a link and an exposed end portion of a pin. A link inner wall face and a pin outer peripheral face in the fitting space are formed with tapered faces whose diameters decrease as they go toward an inmost of the fitting space at angles alpha and beta (alpha>beta) with respect to the axial line of the pin, respectively. The elastic ring contacts with the respective tapered faces in the fitting space at the angles alpha and beta with respect to a perpendicular passing a center of its section. Dimensions d1 and d2 between contact points at the respective tapered faces and a horizontal line passing the center of the section of the elastic ring, the diameter D of the section of the elastic ring, and the angles alpha and beta have a relation of alpha>beta, D>d1+d2 (where d1=D/2.cos alpha, d2=D/2.cos beta). Therefore, the links and the pin can be connected to each other securely and firmly with a sufficient holding force to the pin in the axial direction. Thus, assembly of the links and the pin can be carried out easily at a low cost.
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