초록 ▼

A vehicle propulsion system is provided with an auxiliary hydraulic drive having a variable displacement motor connected to ground engaging wheels by a clutch. A multiple position control has a first position which causes clutch engagement and positions a motor displacement member in a position whic

A vehicle propulsion system is provided with an auxiliary hydraulic drive having a variable displacement motor connected to ground engaging wheels by a clutch. A multiple position control has a first position which causes clutch engagement and positions a motor displacement member in a position which permits fluid drive of the motor. The control has a second position which causes clutch disengagement and positions the motor displacement member in a zero displacement condition which prevents fluid drive of the motor. Preferably the control is responsive to motor output speed and reduces motor displacement as speed increases.

대표청구항 ▼

A positive displacement fluid drive transmission system for a vehicle having ground engaging means and including a prime mover, pump means driven by said prime mover, variable displacement fluid motor means, displacement control means operatively controllingly coupled to said motor means, fluid pass

A positive displacement fluid drive transmission system for a vehicle having ground engaging means and including a prime mover, pump means driven by said prime mover, variable displacement fluid motor means, displacement control means operatively controllingly coupled to said motor means, fluid passageways means interconnecting said motor means to said pump means in driving relationship, clutch means drivingly connecting said motor means to said ground engaging means, said clutch means having an engaged position and a disengaged position, said transmission system characterized by said displacement control means for said motor means having a zero displacement position to preclude said motor means from being driven by said pump means, a multi-position control means controllingly coupled to both said clutch means and said displacement control means for said motor means, said multi position control means having a first position wherein said clutch means is in said engaged position and said motor means is driven and a second position wherein said clutch means is in said disengaged position and said motor displacement control means is in said zero displacement position.