Hydrostatic drive arrangement
A hydrostatic drive arrangement is described for a vehicle which consists of: a pair of variable speed hydrostatic transmissions each having a hydraulic pump, a hydraulic motor and a closed loop hydraulic circuit interconnecting the pump and the motor for communicating fluid therebetween; synchronizing valve means interconnected between the hydraulic circuits of the transmissions normally permitting interflow of fluid through first passage means between the hydraulic circuits for synchronizing the output speeds of the transmissions when the fluid pressure in the hydraulic circuits is below a predetermined value, the synchronizing valve means being responsive to fluid pressures in the hydraulic circuits to restrict interflow therebetween through restricted second passage means when the fluid pressure in one of the hydraulic circuits exceeds the predetermined value; a hydraulic charge pump connected with the closed loop hydraulic circuits for replenishing fluid lost from the hydraulic circuits; and selector valve means disposed between the hydraulic charge pump and the synchronizing valve means for selectively communicating the synchronizing valve means normally blocking communication between the synchronizing valve means and the hydraulic charge pump and establishing communication between the synchronizing valve means and the drain thereby permitting interflow of fluid between the hydraulic circuits, and means responsive to a steering operation of the vehicle to establish communication between the synchronizing valve means and the hydraulic charge pump thereby blocking interflow of fluid between the hydraulic circuits.
- Assignee:
- Kabushiki Kaisha Komatsu Seisakusho, Tokyo
- Patent Number(s):
- US 4583371
- OSTI ID:
- 5744493
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FLOW REGULATORS
FLUIDS
HYDRAULIC CONTROL DEVICES
HYDRAULIC EQUIPMENT
HYDRAULIC FLUIDS
HYDROSTATICS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
MOTORS
PRESSURE DEPENDENCE
PUMPS
VALVES
VEHICLES
VELOCITY
WORKING FLUIDS