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1. (WO2001036818) HYDRAULIC RADIAL PISTON MOTOR

Pub. No.:    WO/2001/036818    International Application No.:    PCT/EP2000/011212
Publication Date: Sat May 26 01:59:59 CEST 2001 International Filing Date: Wed Nov 15 00:59:59 CET 2000
IPC: F03C 1/40
F16D 55/02
F16D 65/14
Applicants: ZF FRIEDRICHSHAFEN AG
LEGNER, Jürgen
Inventors: LEGNER, Jürgen
Title: HYDRAULIC RADIAL PISTON MOTOR
Abstract:
The invention relates to a hydraulic radial piston motor. The aim of the invention is to reduce the impact produced in a hydraulic radial piston motor during downshifting and upshifting. To this end, a valve (1) that controls the piston capacity of the radial piston motor is controlled in a throttled manner. To prevent the pressure level of the pressurized medium supply (3) to the hydraulic radial piston motor from influencing the throttled control, the valve (1) which controls the piston capacity of the hydraulic radial piston motor is provided with a sealed section. A valve (24) is mounted upstream of the valve (1) that controls the piston capacity of the hydraulic radial piston motor. Said valve (24) depressurizes the valve (1) that controls the piston capacity of the hydraulic radial piston motor every time the pressurized medium supply (3) from a hydraulic source to the hydraulic radial piston motor falls below a defined pressure level.