Title:
HYDRAULIC PUMP
Document Type and Number:
WIPO Patent Application WO/2022/065501
Kind Code:
A1
Abstract:
A hydraulic pump (1) comprises: a valve plate (6) having formed therein an intake port and a discharge port; a valve cover (7) to which the valve plate (6) is attached; and a cylinder block (2) that slides with the valve plate (6). The valve cover (7) has formed therein an intake channel and a discharge channel, and further has formed therein: a first chamber (8) that is in communication with the discharge channel through a communication channel (81) and that functions as a Helmholtz resonator; and a second chamber (9) that is in communication with the discharge channel or the first chamber (8) through an introduction channel (91) having a constriction (92). The valve cover (7) and the valve plate (6) have formed therein a supply channel (93) extending from the second chamber (9) to a bottom dead center-side closed surface (64) between the intake port and the discharge port in the valve plate (6). The supply channel (93) has a constriction (94).
Inventors:
YOSHIDA TAKESHI
MIURA HIDETOSHI
HIRANO YASUNORI
MAKINO YUTA
HYODO YUYA
MIURA HIDETOSHI
HIRANO YASUNORI
MAKINO YUTA
HYODO YUYA
Application Number:
PCT/JP2021/035492
Publication Date:
March 31, 2022
Filing Date:
September 28, 2021
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
International Classes:
F04B1/2064
Domestic Patent References:
| WO2006085547A1 | 2006-08-17 |
Foreign References:
| JPS63202774U | 1988-12-27 | |||
| JP2000097147A | 2000-04-04 | |||
| US6024541A | 2000-02-15 | |||
| JPH10231778A | 1998-09-02 | |||
| JP2011236847A | 2011-11-24 | |||
| KR20150003096U | 2015-08-17 | |||
| JPH0385381A | 1991-04-10 |
Attorney, Agent or Firm:
ARCO PATENT & TRADEMARK ATTORNEYS (JP)
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