초록 ▼

A hydrostatic drive system for vehicles including a hydromotor with a control unit forming together a drive unit which in the assembled state can be inserted in the seat of the centering device of the drive system, the configuration and arrangement of the wheel brake valve wakes possible to obtain a

A hydrostatic drive system for vehicles including a hydromotor with a control unit forming together a drive unit which in the assembled state can be inserted in the seat of the centering device of the drive system, the configuration and arrangement of the wheel brake valve wakes possible to obtain a drive unit with compact dimensions, in axial as well as in radial direction, especially due to the double function of the wheel brake valve which serves simultaneously as a pressure relief valve.

대표청구항 ▼

A hydrostatic drive system for vehicles, particularly crawlers, the system comprising: a hydromotor mounted in a hub of the drive wheel; and control means for controlling a flow of the pressure medium through the hydromotor to provide different modes of the vehicle, the control means comprising: a h

A hydrostatic drive system for vehicles, particularly crawlers, the system comprising: a hydromotor mounted in a hub of the drive wheel; and control means for controlling a flow of the pressure medium through the hydromotor to provide different modes of the vehicle, the control means comprising: a housing mounted on the hub, first and second pressure lines for delivering the flow of the pressure medium to and from the hydromotor, a control line delivering a control pressure to a pilot valve operatively interconnected with the pressure lines and with the hydromotor, first and second wheel brake valves intercepting respective first and second lines in the housing and regulating the cross section of a return flow of the pressure medium from the hydromotor steering it on and off in response to an operational pressure of the hydromotor, each of the brake valves including: a valve housing formed with an axial annular bore, a control piston slidable axially in the borebetween open and close positions of the valve, the control piston being formed with a frontal outer spring-loaded side and an inner opposite side encountering the return flow, the inner side being formed with a narrow annular valve seat, and a counter piston movable axially in the bore, said counter piston extending axially away from the control piston and formed with an annular flange abutting the annular seat in the closed position, the flange and seat forming a throttle gap tapering outwardly toward the frontal side.