Patent ID: 8029407

Claim:
A planetary gear set equipped with a pinion shaft and at least a carrier, comprising: the pinion shaft having an engaging portion that protrudes from a distal end portion thereof in a longitudinal direction of the pinion shaft; the carrier into which the engaging portion of the pinion shaft is inserted; and a fastener engaged in series of the carrier and the fastener, to the engaging portion, such that an interior circumference of a portion of the carrier is fixed to the pinion shaft; wherein the portion of the carrier comprises a protruding portion protruding toward a center axis of the engaging portion, and the protruding portion of the carrier is interposed between the pinion shaft and the fastener in series; and wherein at least a protrusion is formed on a first side of the pinion shaft around the engaging portion wherein the first side is formed on the distal end portion of the pinion shaft and between an exterior circumference of the engaging portion and an exterior circumference of the pinion shaft.