Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/270178
Kind Code:
A1
Abstract:
This hydraulic drive device drives a hydraulic actuator by supplying and discharging a hydraulic fluid, and comprises: a hydraulic pump that discharges the hydraulic fluid; an electric motor that drives the hydraulic pump; a hydraulic circuit which has a first hydraulic passage and a second hydraulic passage to be connected to the hydraulic pump and the hydraulic actuator, respectively, and which forms a closed circuit by the first hydraulic passage and the second hydraulic passage; and a control device that controls the operation of the hydraulic actuator by driving the electric motor. The hydraulic circuit is interposed in the first hydraulic passage and has a first opening/closing valve configured to be able to be opened and closed. The control device opens and closes the first opening/closing valve and increases the pressure in the first hydraulic passage by driving the electric motor before opening the first opening/closing valve.
Inventors:
SHIRAO JUNICHI
TANAKA HIDEKI
FUJIWARA YASUHIRO
TANAKA HIDEKI
FUJIWARA YASUHIRO
Application Number:
PCT/JP2022/020229
Publication Date:
December 29, 2022
Filing Date:
May 13, 2022
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F15B11/00
Foreign References:
| JP2002195209A | 2002-07-10 | |||
| JPS60101301A | 1985-06-05 | |||
| JPS57110856A | 1982-07-09 | |||
| US20130081384A1 | 2013-04-04 |
Attorney, Agent or Firm:
ISHIDA, Shoji (JP)
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