Title:
THREEEPUMP HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY OR THE LIKE
Document Type and Number:
Japanese Patent JPS5586907
Kind Code:
A
Abstract:
PURPOSE:To select an optimal pump depending on necessity and efficiently use the output of an engine, by providing two hydraulic pumps of equal small capacity and a pump whose capacity is double that of the former pumps. CONSTITUTION:Two hydraulic pumps 2a', 2b' of equal small capacity and a hydraulic pump 2c', whose capacity is double that of the former pumps, are coupled to the output shaft of the engine 1 of construction equipment. The discharge ports of the pumps are connected to the inlet ports 8a-8c of a two-position six-port directional control valve 8. Two outlet ports 8d, 8e of the directional control valve 8 are connected through ducts 9a, 9b to tandem directional control valves 5a, 5b, which control oil supply to actuators 6 (6a-6f). Optional switching can be effected by the directional control valve 8 to utilize the three pumps for work or running or utilize only two pumps 2a', 2b'. This results in effectively using the output of the engine.
Inventors:
SUZUKI HAJIME
NANBU MASAHIRO
NANBU MASAHIRO
Application Number:
JP16234778A
Publication Date:
July 01, 1980
Filing Date:
December 22, 1978
Export Citation:
Assignee:
JAPAN STEEL WORKS LTD
International Classes:
E02F9/22; E02F9/20; F15B11/16; F15B11/17; (IPC1-7): E02F9/20; F15B11/16