초록 ▼

A vehicle drive system including a wheel (16) to be driven, a suspension (18) having multiple relatively movable parts (24,26,28) and mounting the wheel for rotation and translation on a vehicle frame, a hydraulic rotary output motor (12) connected to the wheel for driving the wheel, a hydraulic pum

A vehicle drive system including a wheel (16) to be driven, a suspension (18) having multiple relatively movable parts (24,26,28) and mounting the wheel for rotation and translation on a vehicle frame, a hydraulic rotary output motor (12) connected to the wheel for driving the wheel, a hydraulic pump (10) providing hydraulic fluid under pressure to the motor, a conduit (50) interconnecting the pump and the motor, and a flow control valve (40) in the conduit for controlling the flow. A switch (90) is associated with two of the relatively movable parts of the suspension for sensing relative movement therebetween indicative of the wheel losing contact with the underlying terrain and a valve (60) is responsive to the switch (90) for causing the flow control valve (40) to halt the flow of hydraulic fluid between the pump and the motor upon the wheel losing contact with the ground to prevent overspeed of the motor (12).

대표청구항 ▼

In a vehicle drive system including a wheel (16) to be driven, a suspension (18) having multiple relatively movable parts (20,24,26,28) and mounting the wheel for rotation and translation on a vehicle frame, a hydraulic rotary output motor (12) connected to the wheel for driving the wheel, a hydraul

In a vehicle drive system including a wheel (16) to be driven, a suspension (18) having multiple relatively movable parts (20,24,26,28) and mounting the wheel for rotation and translation on a vehicle frame, a hydraulic rotary output motor (12) connected to the wheel for driving the wheel, a hydraulic pump (10) for providing hydraulic fluid under pressure to the motor, a conduit (50,50L, 50R) interconnecting the pump and the motor, and a flow control valve (40,40L,40R) in the conduit for controlling the flow of hydraulic fluid between the pump and motor, the improvement comprising: sensing means (90,92,94) associated with two of the relatively movable parts of the suspension for sensing relative movement therebetween indicative of the wheel losing contact with the underlying terrain on which it is adapted to ride; and valve operating means (54,60,60L,60R) responsive to said sensing means for substantially immediately closing said valve and thereby halt the flow of hydraulic fluid between said pump and motor upon the wheel losing said contact to prevent overspeed of said motor.