Transmission for a working vehicle

A transmission for a vehicle comprising:

• a housing having a first chamber and a second chamber;
• a hydrostatic transmission switchable between forward and rearward movements, said hydrostatic transmission including a hydraulic pump and a hydraulic motor wherein one of said hydraulic pump and said hydraulic motor is housed in said first chamber of said housing and the other of said hydraulic pump and said hydraulic motor is housed outside said first chamber;
• a gear-type speed changing unit for changing running speed of said hydrostatic transmission in a plurality of steps connected in a driving manner to said hydrostatic transmission and housed in said second chamber;
• a speed control arm;
• and
• a restraint mechanism housed in said first chamber for restraining rearward movement of the said speed control arm to no more than a predetermined speed.

A system for transmitting power from an engine to driving wheels of a vehicle, comprising:

• a housing;
• a hydrostatic transmission switchable between forward and rearward movements disposed in said housing;
• a gear-type speed changing unit including a speed changing member for changing the running speed of said hydrostatic transmission in a plurality of steps;
• and
• a restraint mechanism provided on said housing for limiting rearward acceleration of the driving wheels to no more than a predetermined speed by limiting motion of said speed changing member, when said gear-type speed changing unit is positioned at a high speed setting.