Title:
【発明の名称】液圧装置及び液圧回路と救命器具
Document Type and Number:
Japanese Patent JP2736336
Kind Code:
B2
Abstract:
A power unit essentially consisting of a pump (2) and a cylinder (1) for driving a tool has a high-pressure space (1a) and two low-pressure spaces. The high-pressure space (1a) and the first low-pressure space (1b) are separated from one another by a piston (10). The second low-pressure space serves solely as a compensating volume (1c), the volume of the compensating space (1c) corresponding to at least the sum of the displacement volume of the piston rod (11) moved fully into the cylinder housing (15), the compression volume of the hydraulic fluid, and the stroke volume of the pump (2).
This design can provide an entire compact unit which requires no additional accumulator for the hydraulic medium but in which it is nonetheless ensured that even a simple construction of the pump (2) feeding the cylinder can draw in hydraulic fluid in any position of the unit.
Furthermore, a hydraulic circuit for controlling the power unit is described in which the low-pressure line (7') branches in front of the reversing valve (3) and is taken up to the compensating space (1c).
Inventors:
Date Marlin Lintoner
Application Number:
JP24765890A
Publication Date:
April 02, 1998
Filing Date:
September 19, 1990
Export Citation:
Assignee:
Lucas Huedlaulik Gaemubehound Coker Gauge
International Classes:
B25B7/00; B23D15/14; B23D29/02; B25B1/18; B25B28/00; B66F1/08; F15B7/00; F15B15/18; (IPC1-7): B23D29/02; B25B1/18; B25B28/00; F15B7/00
Domestic Patent References:
| JP63127823U | ||||
| JP3414489Y1 | ||||
| JP5754983Y2 |
Attorney, Agent or Firm:
Hiroyuki Ikeuchi (2 outside)