Patent ID: 6659209
Filing Date: 2003-12-09
Classification: B60K,B60Y,Y10T

Abstract:
A tractor comprising:front wheels; an engine disposed adjacent to said front wheels; rear wheels; a transmission case disposed adjacent to said rear wheels, said transmission case having right and left lateral walls, and a front surface; a framework substantially forming a body of said tractor and extending in a fore and aft direction of said tractor, wherein said framework includes a first frame and a second frame, said first frame having its rearward end region connected to said left lateral wall of said transmission case, and said second frame having its rearward end region connected to said right lateral wall of said transmission case; a hydrostatic stepless transmission (HST) disposed forewardly of said transmission case for receiving power from said engine, said HST including an HST pump and an HST motor; a propelling change speed gearing mechanism housed in said transmission case for receiving the power from said HST motor; a power take-off change speed gearing mechanism housed in said transmission case for receiving the power from said HST pump; a power take-off clutch permitting and breaking the power to be transmitted from said HST pump to said power take-off change speed gearing mechanism; and a rear wheel differential housed in said transmission case, said rear wheel differential including: a differential input gear receiving the power from said propelling change speed gearing mechanism; a differential input shaft mounting said differential input gear thereon to be rotatable about a first transverse axis; a differential output gear receiving the power from said differential input gear and transmitting the power to said rear wheels; and a differential output shaft mounting said differential output gear thereon to be rotatable about a second transverse axis; said second transverse axis extending vertically below and parallel to said first transverse axis; and said differential output gear having a larger diameter than said differential input gear; wherein said propelling change speed gearing mechanism and said power take-off change speed gearing mechanism are disposed in a space defined between said front surface of said transmission case and a virtual plane extending vertically through said first transverse axis and second transverse axis and parallel to said front surface, and within a width of said right and left lateral walls of said transmission case; and said power take-off clutch is disposed upwardly of said differential input gear.