Forward-reverse changeover apparatus for working vehicle

Claim 1

A forward-reverse changeover apparatus for a working vehicle comprising an input shaft, an output shaft arranged coaxial with and separated from said input shaft, a first intermediate shaft for a reverse rotation disposed parallel to said input shaft, a second intermediate shaft for a forward rotation disposed parallel to said input shaft, said second intermediate shaft constituting part of a power takeoff to transmit power to a power takeoff shaft, an output gear fixed to said input shaft, an input gear fixed to said output shaft, a first multiplate clutch disposed on said second intermediate shaft, a second multiplate clutch disposed on said second intermediate shaft, a first gear in mesh with said output gear and fixed to said second intermediate shaft upstream of said first multiplate clutch, a second gear in mesh with said output gear and fixed to said first intermediate shaft upstream of said second multiplate clutch, a second output gear mounted for free rotation on said second intermediate shaft to receive power from said first multiplate clutch and in mesh with said input gear, a third output gear mounted for free rotation on said first intermediate shaft to receive power from said second multiplate clutch, and a back gear disposed between said first intermediate shaft and said output shaft wherein said first and second gears have an equal number of teeth, and said second and third output gears on said first and second intermediate shafts have a substantially equal number of teeth, said third output gear on said first intermediate shaft being displaced toward said input shaft to be out of contact with said input gear, and said back gear having a large width to mesh with said third output gear on said first intermediate shaft and with said input gear simultaneously.