Title:
HYDRAULIC PUMP OR MOTOR
Document Type and Number:
WIPO Patent Application WO/2012/026348
Kind Code:
A1
Abstract:
An axial hydraulic pump configured in such a manner that the cylinder block (6) having cylinder bores formed around the rotation axis slides relative to the valve plate (7) having a high-pressure-side port and a low-pressure-side port and that the amount of reciprocation of the pistons within the cylinder bores is controlled by the tilt of the swash plate. The axial hydraulic pump is provided with: a remaining pressure regeneration circuit (30) which is a pipe path for connecting a top dead center-side communication opening (31) and a bottom dead center-side communication opening (32); and communication holes (41-1 to 41-8) which are respectively provided to the cylinder bores of the cylinder block (6) and which, as the cylinder block (6) rotates, connect the cylinder ports (26-1 to 26-8) of the cylinder bores and the top dead center-side and bottom dead center-side communication openings (31, 32). The bottom dead center-side communication opening (32) is provided on the bottom dead center side at a position which is offset, in the direction in which the cylinder block (6) rotates forward, by an angle Δθ from the line connecting the position of the top dead center-side communication opening (31) and the rotation axis (C). The configuration reduces the generation of the discharge pulsation by the remaining pressure regeneration circuit (30).
Inventors:
IIDA TAKEO (JP)
NAKAGAWA TADASHI (JP)
SAKAI TOMOHIRO (JP)
NAKAGAWA TADASHI (JP)
SAKAI TOMOHIRO (JP)
Application Number:
PCT/JP2011/068441
Publication Date:
March 01, 2012
Filing Date:
August 12, 2011
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
IIDA TAKEO (JP)
NAKAGAWA TADASHI (JP)
SAKAI TOMOHIRO (JP)
IIDA TAKEO (JP)
NAKAGAWA TADASHI (JP)
SAKAI TOMOHIRO (JP)
International Classes:
F03C1/253; F04B1/22
Domestic Patent References:
WO2009037994A1 | 2009-03-26 |
Foreign References:
JPH09317627A | 1997-12-09 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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Claims: