| 摘要 |
PURPOSE:To facilitate light weight and manufacture and improve the qualities of anti-wear and anti-fusing together by providing sliding surface portions where only a cap at a large end portion slides directly with the shoulder surfaces of a crank shaft. CONSTITUTION:A large end portion 8 consists of a main body portion 8a and a cap 8b of a C shaped separate body consisting of a titanium alloy, and is fitted and fixed at a crank pin by means of a bolt and a nut. The cap 8b is a little thicker than the main body portion 8a, and sliding surface 12, 13 alone at both ends of the cap 8b are possible to slide with the shoulder surfaces 14, 15 of a crank shaft, and a hand film 17 consisting of titanium nitride is formed on the surface 16a of the base material 16 of the cap 8b by means of an ion plating method. Accordingly, to conduct at the cap 8b alone surface processing for improving the qualities of anti-wear and anti-fusing together is sufficient, and so the number of works is reduced and the cost of manufacturing is decreased. In the case of forming the cap 8b alone out of a ferrous alloy, there is no need of the hard film, and the number of the works of connecting rod manufacture can be reduced further, and there is no chance of becoming weighty. |
