| 摘要 |
According to the present invention, a crank washer 30 is a ring-shaped flat plate that has a downwardly protruding section and is divided into an upper washer 31 and a lower washer 32 at a plane that passes through the center of the ring. Two of the crank washers 30 form a set, a surface of each of the two that is on the reverse side from a sliding surface is made to face the other, and the two are assembled with a main bearing therebetween. Other than having a rotation stop, the lower washer 32 has the same configuration as the upper washer 31. The rotation stop engages a rotation-stop groove that is provided to a housing and prevents the lower washer 32 from rotating in association with the rotation of a crank shaft. A mating-surface indent prevents mating surfaces of the lower washer 32 and the upper washer 31 from contacting a shaft during assembly. The sliding surface 320 is a surface along which a crank shaft slides, receives a thrust load, and supports the crank shaft. The crank washer 30 is formed entirely from a resin. |
