Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/270176
Kind Code:
A1
Abstract:
This hydraulic drive device drives a hydraulic cylinder by supplying and discharging a hydraulic fluid and comprises: a main pump which has first and the second pump ports and which suctions the hydraulic fluid from one pump port of the first and the second pump port and discharges the hydraulic fluid from the other pump port; a hydraulic circuit that forms a closed circuit by connecting a rod-side port of the hydraulic cylinder and the first pump port to each other and connecting a head-side port of the hydraulic cylinder and the second pump port to each other; and a charge pump that replenishes the one pump port with the hydraulic fluid. The hydraulic circuit is interposed in a rod-side passage connecting the rod-side port and the first pump port to each other and has a control valve capable of controlling the opening degree.
Inventors:
SHIRAO JUNICHI
TANAKA HIDEKI
FUJIWARA YASUHIRO
TANAKA HIDEKI
FUJIWARA YASUHIRO
Application Number:
PCT/JP2022/020227
Publication Date:
December 29, 2022
Filing Date:
May 13, 2022
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/08; F15B11/02; F15B11/028; F15B11/044
Foreign References:
| US20170184139A1 | 2017-06-29 | |||
| JP2006336842A | 2006-12-14 |
Attorney, Agent or Firm:
ISHIDA, Shoji (JP)
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