Supporting structure of shaft of reduction gear

摘要

A first shaft at which a first gear is provided is supported by an angular roller bearing in which a pair of roller rows and which is rolling elements incorporated in a back-to-back combination, and a midpoint of a projection range of a range where the first gear and a second gear mesh with each other on the first shaft is made to exist in a span of a working point of the pair of roller rows of the angular roller bearing on the pinion shaft.