Title:
HYDRAULIC PUMP MOTOR
Document Type and Number:
WIPO Patent Application WO/2021/065553
Kind Code:
A1
Abstract:
In the present invention, in order to prevent the occurrence of pressure pulsation while suppressing a situation where there is a size increase, a regeneration port 9e is provided to a valve plate 9 at a location that communicates with a cylinder bore 4a during an interval until a state of communication with a low-pressure port 9b is ended and a state of communication with a high-pressure port 9a is started. A regeneration oil channel 20 that communicates between the regeneration port 9e and a discharge oil channel 11 is provided inside a port block 2. The regeneration oil channel 20 passes through, between the regeneration port 9e and the discharge oil channel 11, a first region X that is more to the high-pressure port 9a side than a virtual plane α in the port block 2, and further passes through a second region Y that is more to the low-pressure port 9b side than the virtual plane α.
Inventors:
USAMI HIDEAKI (JP)
OKUBO NAOHIRO (JP)
OKUBO NAOHIRO (JP)
Application Number:
PCT/JP2020/035340
Publication Date:
April 08, 2021
Filing Date:
September 17, 2020
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
F04B1/22; F03C1/253
Domestic Patent References:
| WO2009037994A1 | 2009-03-26 |
Foreign References:
| JP4733083B2 | 2011-07-27 | |||
| JP2011236847A | 2011-11-24 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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