A gear transmission structure and a series of gear structures Series

The present invention provides a transmission apparatus and a series of gear structures series gear structure, the transmission range can be manufactured at low cost structure of a plurality of different types of gear shift apparatus. Having a series structure transmission gear, the gear on the outer periphery of the axial structure of the shaft member (22) is arranged with a first gear (24) and the second gear (26), wherein the series comprising: a gear transmission and a transmission having a gear structure (B1) of the structure (A1) of the gear structure (A1, B1) are provided with a first toothed portion at the outer periphery of an axial shaft member (22) is arranged with a (70 ) and the second toothed portion (72) of a common base structure (74), the gear in the structure (A1) by using the unchanged first teeth portion of the base structure (74) (70) to structure constituting the gear (A1) is a first gear (. 24A), the gear structure (B1) by using the plastic flow to bind the large-diameter first gear member (80) fixed to said base structure the radial direction (74) of a first tooth portion (70) of the outer structural body constituted of the gear (B1) of the first gear (24B).