To avoid a crack of a plate around a pressed-in position of a bush, and prevent a nut from being loosen under severe traveling condition.
A horizontal flange 1 is formed on a bush B. A reference surface 2 of the flange 1 is horizontal, and does not have a tapered surface whose diameter is gradually smaller. A press-in portion b extending from the reference surface 2 of the flange 1 is longer than a conventional one, and the outer circumferential surface of the press-in portion is vertical corresponding to a straight part of a press-in hole a. As a result, as a conventional clinching process is not required, cost down is achieved. A tapered seat c at 60 degree is easily processed. Also, even when the bush B is pressed in the press-in hole a, the angel (60 degree) of the tapered seat c of the bush B with respect to a thin plate disk portion d is not changed, and the angle is stably maintained. A wheel W with the bush B has enough resistance to be used under severe conditions.
SUZUKI SHOJI
ASAKAWA NAOKI
NISHISAKA TAKASHI
Norihiko Fujita