Patent ID: 6668549
Filing Date: 2003-12-30
Classification: B60K,B60W,B60Y,F16H

Abstract:
A hydrostatic vehicle driving system applicable to a working vehicle, comprising:an engine; a hydraulic pump driven by said engine; a variable displacement hydraulic motor, a capacity of which is switchable between a first capacity and a second capacity that is larger than said first capacity; a hydraulic circuit for fluidly connecting said hydraulic pump and said hydraulic motor with each other; an axle driven by said hydraulic motor; and a motor capacity control system controlling capacity of said hydraulic motor in correspondence to the condition of load on said engine, said motor capacity control system including an actuator for switching the capacity of said hydraulic motor between said first and second capacities, and a control device for controlling said actuator, wherein said control device controls said actuator so that the capacity of said hydraulic motor is set to said first capacity when said load on said engine is less than a predetermined value, and set to said second capacity when said load on said engine is not less than said predetermined value.