MECHANISM FOR TRANSMITTING POWER BETWEEN SHAFT AND HUB

摘要

A shaft tooth section (22) has a mountain section (22a) of a twisted shape crossing the axis of a shaft (12) (mountain section (28a) of hub tooth section (28)). The hub tooth section (28) has the mountain section (28a) of a linear shape having a constant tooth thickness, and the inner diameter of the mountain section (28a) varies from an end section (13) toward the shaft shank (24) side. A first step (30) expanding toward the hub tooth section (28) side is formed in a valley section (22b) of the shaft tooth section (22). A second step (32) recessed toward the opposite side of the shaft tooth section (22) is formed in the mountain section (28a) of the hub tooth section (28). The start point (P1) of the first step (30) and the start point (P2) of the second step (32) are set at the positions separated by a predetermined distance (L4).