POWER TRANSMISSION DEVICE

摘要

In the power transmission device (20), a drum section (110), which functions as the brake drum of a brake (B1) for fixing the second sun gear of a second planetary gear mechanism to the transmission case (22) so as to be unable to rotate, is integrally molded on a support member (100), which is fixed to the transmission case (22) via a bolt (99) and is for supporting a counter drive gear (41) so as to rotate freely. Because the drum section (110) also functions as a rib as a result of the cylindrical drum section (110) being integrally molded to the support member (100) that supports the counter drive gear (41) in this manner, it is possible to improve the strength of the support member (100).