Patent ID: 8439792

Claim:
A planetary gear mechanism comprising: an input member ( 22 ); a first carrier ( 100 ) having a first carrier first pinion gear (P 1 ) and a first carrier second pinion gear (P 2 ), each journalled to the first carrier, the first carrier rotationally fixed to the input member ( 22 ), the first carrier second pinion gear (P 2 ) engaged with a first brake (Brake 1 ) through a sun gear (S 1 ); a second carrier ( 200 ) having second carrier first pinion gear (P 4 ) and a second carrier second pinion gear (P 5 ), each pinion gear (P 4 ), (P 5 ) is journalled to the second carrier, the second carrier engaged with a second brake (Brake 2 ); a first ring gear (R 1 ) in meshing engagement with the first carrier first pinion gear (P 1 ), a second ring gear (R 2 ) in meshing engagement with the second carrier first pinion gear (P 4 ), the first ring gear and second ring gear comprise a ring gear member ( 400 ); a third carrier ( 300 ) having a third carrier first pinion gear (P 6 ) and a third carrier second pinion gear (P 7 ), each pinion gear (P 6 ), (P 7 ) is journalled to the third carrier; a third ring gear (R 3 ) in meshing engagement with the second carrier second pinion gear (P 5 ), the third ring gear fixedly connected to the third carrier ( 300 ); a fourth ring gear (R 4 ) engaged with a third brake (Brake 3 ) and in meshing engagement with the third carrier first pinion gear (P 6 ); a first one-way clutch (CL 1 ) engaged between the first carrier ( 100 ) and the ring gear member ( 400 ); a second one-way clutch (CL 2 ) engaged between the second carrier ( 200 ) and the ring gear member ( 400 ); a third one-way clutch (CL 3 ) engaged between the third carrier ( 300 ) and the fourth ring gear (R 4 ); and an output member ( 44 ) in meshing engagement with the third carrier second pinion gear (P 7 ).