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A control for a variable displacement motor which utilizes a motor speed sensitive signal for moving the displacement of the motor toward a zero displacement setting position including a device for generating a conditioned variable signal representative of motor speed, circuitry for receiving said s

A control for a variable displacement motor which utilizes a motor speed sensitive signal for moving the displacement of the motor toward a zero displacement setting position including a device for generating a conditioned variable signal representative of motor speed, circuitry for receiving said signal and upon the signal reaching a predetermined intermediate value applying the signal to the control device for motor displacement for causing reduction in motor displacement and with various devices in the circuit for modifying the variable signal to provide a desired relation between motor speed and motor displacement. Utilization of such controls individually associated with plural variable displacement motors driving vehicle wheels and driven by one pump protects against spin-out of one of the wheels. The variable motor control is usable in a load-compensated system wherein at least one motor is associated with a drive at the front of the vehicle and another motor with the drive at the rear of the vehicle and with the control circuit having a valve responsive to the pressure condition in the system pressure lines connected between the pump and motors for differing adjustment of the displacement of the front and rear drive motors. The variable motor control is usable in a vehicle drive system with separate drives on the right and left-hand side of the vehicle to obtain steer compensation whereby the displacement of at least a pair of motors associated with the separate drives at the right and left sides of the vehicles are controlled by a circuit which includes a valve responsive to a steering signal whereby the displacement of the motors in their respective drives is varied to apply torque to the wheels in a relation to that required in connection with turning of the vehicle.

대표청구항 ▼

A hydrostatic drive system for a pair of drive shafts with anti-slip drive characteristics comprising, a pair of variable displacement fluid motors associated one with each of said drive shafts, a pump in closed circuit with said motors with said motors being connected in parallel with said pump, a

A hydrostatic drive system for a pair of drive shafts with anti-slip drive characteristics comprising, a pair of variable displacement fluid motors associated one with each of said drive shafts, a pump in closed circuit with said motors with said motors being connected in parallel with said pump, a pair of movable displacement-setting members associated one with each motor, a pair of signal-generating means associated one with each motor and with each signal-generating means generating a variable signal which increases in value as the speed of the associated motor increases, and control devices connected one to each of said displacement-setting members and responsive to an increase in the variable signal indicating increased motor speed for reducing displacement of the associated motor with the maximum value of the variable signal achieving zero output torque.