Patent ID: 7131927

Claim:
A coaxial-type differential transmission apparatus, comprising: a base; a fixed gear fixed on the base; an intermediate member adjacent to the fixed gear, wherein the fixed gear is disposed between the base and the intermediate member; an input shaft rotatably fitted in the base and fixed gear and fixed on the intermediate member; an output shaft rotatably adjacent to the input shaft and coaxial thereto; a reduction gear slidably disposed on the output shaft; an acceleration gear slidably disposed on the output shaft and connected to the reduction gear, wherein the acceleration gear is disposed between the reduction gear and the intermediate member; a shifting device disposed on the base and output shaft to adjust position of the reduction and acceleration gears on the output shaft, adjusting rotational speed of the output shaft; at least one transmission shaft rotatably fitted in the intermediate member; at least one first gear fixed on the transmission shaft and adjacent to the intermediate member, wherein the first gear engages the fixed gear; at least one second gear fixed on the transmission shaft, wherein the reduction gear selectively engages the second gear by means of the shifting device; and at least one third gear fixed on the transmission shaft and between the second gear and the intermediate member, wherein the acceleration gear selectively engages the third gear by means of the shifting device.