Patent ID: 6361463
Filing Date: 2002-03-26
Classification: F16H

Abstract:
A drive transmission for vehicles which is interposed in a driving power transmission line extending from a driving power source to driving wheels, comprising:a main driving shaft operatively coupled to said driving power source; a hydrostatic transmission including a hydraulic pump with an input shaft and a hydraulic motor with an output shaft, at least one of said hydraulic pump and said hydraulic motor being of a variable-displacement type that includes a volume varying operation member, said input shaft adapted to receive a part of driving power of said driving power source, which is branched from said main driving shaft, and said output shaft adapted to output the driving power variable in response to the operation of said volume varying operation member; a mechanical transmission including a driving shaft and a driven shaft disposed in parallel with said driving shaft, said driving shaft adapted to receive a part of the driving power from the driving power source via said main driving shaft, so as to stepwisely vary the speed between said driving shaft and said driven shaft; and a planetary gear device including a sun gear non-rotatably coupled to said output shaft of said hydrostatic transmission, a carrier non-rotatably coupled to said driven shaft, planet gears in mesh with said sun gear to be moved therearound according to the rotation of said carrier, and an outer ring with an internal gear in mesh with said planet gears; wherein the driving power to be transmitted to the driving wheels is taken out of said outer ring.