Torque split type automatic speed change device

Claim 1

A torque split type of automatic speed change device connected to an engine crankshaft comprising a hydraulic torque converter having a pump, a turbine and a stator; a torque converter brake allowing said stator to rotate only in the same direction as said engine crankshaft; a long spindle axially aligned with said torque converter and having one end thereof connected to one of said pump and said turbine; a first clutch means operatively connected to said long spindle; a one-way brake allowing said first clutch means to rotate in the normal direction; a rotary member revolving around said long spindle and connected to the other of said pump and said turbine; two split power transmission routes consisting of a route including said long spindle, said first clutch means and a first brake and another route including said rotary member, a second clutch means, a third clutch means and a second brake; a planetary gear assembly disposed in parallel with said long spindle and connected to said torque converter through said two split power transmission routes; said planetary gear assembly synthesizing powers transmitted thereto through said two split power transmission routes for producing an output power; an output means receiving said output power from said planetary gear assembly; said planetary gear assembly comprising sun gears operatively connected to said rotary member through said clutch means; a first planet gear; a first carrier for said first planet gear connected to said output means; and a first internal gear, said first planet gear meshed with one of said sun gears and said first internal gear; a second internal gear; a second planet gear meshed with another of said sun gears and said second interNal gear and a second carrier for said second planet gear operatively connected to said first clutch means and said one-way brake whereby said second clutch means and said one-way brake are actuated while releasing all brakes for driving said output means at a forward first stage, said second clutch means being actuated while actuating only said second brake for driving said output device at a forward second stage, said second clutch means and said first clutch means being actuated for driving said output means at a forward fourth stage, said third clutch means being actuated while actuating said first brake for driving said output means in the rearward direction.