Title:
CAPACITY COMPENSATION DEVICE FOR CLOSED HYDRAULIC CIRCUIT
Document Type and Number:
Japanese Patent JPS58193901
Kind Code:
A
Abstract:
PURPOSE:To get a large effective capacity with a small pressure difference by a method wherein a pressurizied tank is provided with an oil chamber and an air chamber which are separated by a flexible membrane, and the air chamber is provided with a neumatic pressure supplying source and means for setting air discharging pressure set to such a higher pressure than said predetermined pressure through the pressure setting means. CONSTITUTION:A pressurized tank 15 is divided into an oil chamber A and an air chamber B by a flexible membrane 16, and guards 17 and 18 are arranged in each of the chambers so as to define the maximum deformation degree of the spacer film 16. To the air chamber B is connected a safety valve 19 and its setting pressure is lower than the set pressure in the relief valve 11. The air chamber B is connected to a compressor 23 through an air tank 22, the set pressure in a pressure relief valve 21 in the midway thereof is lower than the predetermined pressure in the safety valve 19. In the air tank 22 is arranged a safety valve 24.
Inventors:
ISHIZUKA KATSUAKI
IZUMI EIKI
IZUMI EIKI
Application Number:
JP6637682A
Publication Date:
November 11, 1983
Filing Date:
April 22, 1982
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/08; F15B7/10; (IPC1-7): F15B1/00; F15B11/08
Domestic Patent References:
| JP56119001B | ||||
| JPS5138119A | 1976-03-30 |
Attorney, Agent or Firm:
Kenjiro Take