Power transmission mechanism

Claim 1

A power transmission mechanism comprising a casing, an input shaft, an intermediate shaft, first and second single pinion planetary gears each including a sun gear and a ring gear, a double pinion planetary gear including a sun gear and a ring gear, and an output shaft, with all of said components being concentrically arranged, a first clutch provided between said input shaft and said intermediate shaft, means integrally connecting said sun gears of said single pinion planetary gears, a second clutch provided between said input shaft and said integrally connected sun gears of said single pinion planetary gears, means connecting said intermediate shaft to said ring gear of said first single pinion planetary gear, a first brake provided between said integrally connected sun gears and said casing, a carrier for said first single pinion planetary gear, means connecting said first single pinion planetary gear, said ring gear of said second single pinion planetary gear and said sun gear of said double pinion planetary gear to said output shaft, a carrier for said second single pinion planetary gear, a second brake provided between said second single pinion planetary gear carrier and said casing, a carrier for said double pinion planetary gear connected to said second single pinion planetary gear c8 carrier, a third brake provided between said ring gear of said double pinion planetary gear and said casing, and means for effecting selective engagement and disengagement of said brakes and clutches to provide desired gear ratios for four forward speeds and one reverse speed in the operation of said transmission mechanism.