Dual planetary gear for automatic transmissions

摘要

One pinion member of one of first and second pinions (P,Q), meshed with a sun gear (S) is meshed with two pinion members (Q1,Q2) of the other pinion, e.g. a second pinion meshed with a ring gear (R2). The torque of the ring gear (or sun gear) is transmitted to the sun gear (or ring gear) via the pinions. During this time, the sun gear and pinion member of the first mentioned pinion (P) contact each other at one position, whereas the ring gear and pinion members (Q1,Q2) of the second-mentioned pinion contact each other at two positions. This enables the tooth surface pressure occurring between the ring gear and pinion members of the second-mentioned pinion to be distributed.