Title:
HYDRAULIC PUMP/MOTOR AND METHOD FOR PREVENTING PULSATION OF HYDRAULIC PUMP/MOTOR
Document Type and Number:
WIPO Patent Application WO/2011/115180
Kind Code:
A1
Abstract:
Disclosed is a hydraulic pump/motor provided with two pressure accumulation oil passages (20, 21) for accumulating pressure, which respectively communicate with a pair of ports (20a, 20b) and a pair of ports (21a, 21b), said ports (20a, 20b) and said ports (21a, 21b) being respectively provided on a valve plate on the top dead point side and the bottom dead point side, and on the outside of the slide and rotation trajectory area of cylinder bores (9-1 to 9-7). A cylinder block has two communication holes (9-1a, 9-1b) for each cylinder bore, each communication hole communicating with each cylinder bore, and having an opening that slides on each port in conjunction with the rotation of the cylinder block, to communicate with each port. The ports of each pressure accumulation oil passage (20, 21) exclusively communicate with the communication holes, so that a pressure accumulation operation for accumulating the pressure of one cylinder bore in each pressure accumulation oil passage via the communication holes in two steps, and an accumulated pressure collection operation for collecting in two steps the pressure accumulated in each pressure accumulation oil passage, within the one cylinder bore, are performed. Thus, a hydraulic pump/motor which can suppress the pulsation and a method for suppressing the pulsation of a hydraulic pump/motor can be realized by a simple structure.
Inventors:
MIYATA TAKAHIRO (JP)
MARUTA KAZUHIRO (JP)
MARUTA KAZUHIRO (JP)
Application Number:
PCT/JP2011/056252
Publication Date:
September 22, 2011
Filing Date:
March 16, 2011
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
MIYATA TAKAHIRO (JP)
MARUTA KAZUHIRO (JP)
MIYATA TAKAHIRO (JP)
MARUTA KAZUHIRO (JP)
International Classes:
F04B1/24; F03C1/253; F04B11/00; F04B53/10
Domestic Patent References:
| WO2009037994A1 | 2009-03-26 |
Foreign References:
| JPH09287553A | 1997-11-04 | |||
| JP2000045929A | 2000-02-15 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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Claims: