Title:
DEVICE FOR CONTROLLING PRESSURE IN CYLINDER CHAMBER OF HYDRAULIC PUMP MOTOR
Document Type and Number:
WIPO Patent Application WO/1994/015097
Kind Code:
A1
Abstract:
A device for controlling pressure in a cylinder chamber of a hydraulic pump motor, wherein a piston is inserted into a cylinder bore of a rotatable cylinder block to form a cylinder chamber, and said cylinder block is rotated, whereby a port of said cylinder chamber can be alternately opened to a high pressure port or a low pressure port of a valve plate, characterized in that, a first change-over port is formed on the side of the top dead center of said valve plate, said first change-over port communicates with a tank through a first on-off valve, a second change-over port is formed on the side of the bottom dead center of the valve plate, said second change-over port communicates with the high pressure port through a second on-off valve, and there are provided a rotary speed detecting means for detecting a rotary speed of said cylinder block, a pressure detecting means for detecting the highest pressure in said cylinder chamber and a means for controlling open-close timings and openings of said first and said second on-off valves in accordance with said rotary speed and said highest pressure.
Inventors:
ISHIZAKI NAOKI (JP)
Application Number:
PCT/JP1993/001862
Publication Date:
July 07, 1994
Filing Date:
December 22, 1993
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
ISHIZAKI NAOKI (JP)
ISHIZAKI NAOKI (JP)
International Classes:
F03C1/38; F03C1/40; F03C1/253; F04B1/20; F04B49/06; F04B49/22; (IPC1-7): F04B1/26; F04B49/00
Foreign References:
| JPH01203666A | 1989-08-16 | |||
| JPS566080A | 1981-01-22 | |||
| JPS6413274U | 1989-01-24 | |||
| JPS595778U | 1984-01-14 | |||
| JPH02238179A | 1990-09-20 |
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