Patent ID: 8905883
Filing Date: 2014-12-09
Classification: F16H,Y02T,Y10T

Abstract:
1. A torque split type automatic transmission which transmits a torque output from an engine through two paths, adds each torque passing through and being increased in each path of the two paths, and outputs a final torque, the torque split type automatic transmission comprising: a torque split device comprising a planetary gear set which receives the torque of the engine, divides the torque into two portions, and transmits the two portions of the torque respectively to first and second power delivery paths of the two paths; a launching device being a torque converter, being disposed on the first power delivery path, and converting a torque transmitted to the first power delivery path to output a first torque; a transmission device being a multiple-shift transmission, being disposed on the second power delivery path, and converting a torque transmitted to the second power delivery path by a gear ratio to output a second torque; and a transfer shaft directly engaged with outputs of the launching device and the transmission device downstream from the transmission device so as to add the first and second torques transmitted respectively from the launching device and the transmission device to output the final torque, wherein the first power delivery path completely bypasses the transmission device to the transfer shaft; wherein the torque split device comprises a single pinion planetary gear set and is disposed adjacent to the torque converter which is the launching device; wherein the torque split device comprises a sun gear, a planet carrier, and a ring gear as rotational elements thereof; wherein the planet carrier is directly connected to an output shaft of the engine so as to be operated as an input element, the sun gear is connected to the transmission device through a first power delivery shaft forming the second power delivery path, and the ring gear is connected to an impeller of the torque converter through a connecting member and is connected to a turbine through a lock-up clutch so as to form the first power delivery path; and wherein the turbine outputs the first torque through a second power delivery shaft connected to the turbine.