Transmission for self-propelled working vehicles

In a self-propelled working vehicle, wherein left and right rear wheels are driven by engine through a transmission path including therein before a differential gearing for said rear wheels a hydrostatic transmission and speed-change gearing which are connected in series with each other, and wherein there are provided a mid-PTO shaft for driving a working implement of mid-mount type and a rear-PTO shaft for driving a working implement drawn by the vehicle, a transmission for transmitting power from the engine to said rear wheels and to said PTO shafts, characterized in:

• that there is provided between said left and right rear wheels a transmission case which supports rotatably at left and right sides thereof the said wheels and which journals said PTO shafts in a fashion such that said mid-PTO shaft extends forwardly from said case at a low level thereof whereas said rear-PTO shaft extends backwardly from said case at a middle level thereof;
• that said hydrostatic transmission is fixedly arranged on the front of said transmission case at a level above said mid-PTO shaft in a fashion such that hydraulic pump thereof driven by the engine is disposed above hydraulic motor driven by said pump, shafts of said pump and motor being projected into said transmission case;
• that said speed-change gearing and differential gearing are arranged so as to connect wheel axles of said rear wheels operatively to said motor shaft within said transmission case at a lower half thereof in a fashion such than the former gearing is disposed more forwardly than the latter gearing;
• and that a PTO-clutch mechanism for selectively continuing and discontinuing transmission of power to said PTO shafts and a speed-change mechanism for said rear-PTO shaft are arranged within said transmission case at an upper half thereof in a fashion such that the former mechanism is disposed more forwardly than the latter mechanism, said PTO-clutch mechanism being drivenly connected to said pump shaft and said mid-PTO shaft and said speed-change mechanism being drivenly connectedly respectively to said PTO-clutch mechanism.