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Patent Searching and Data


Title:
AXIAL PISTON HYDRAULIC ROTATING MACHINE
Document Type and Number:
WIPO Patent Application WO/2011/052512
Kind Code:
A1
Abstract:
Provided is an axial piston hydraulic rotating machine wherein the stability of a piston shoe is high. A circular internal static pressure pocket (23) which communicates with a fill opening (9A), an inner peripheral land portion (22) formed on the outer periphery of the internal static pressure pocket (23), an external static pressure pocket (24) formed on the outer periphery of the inner peripheral land portion (22), and an outer peripheral land portion (25) formed on the outer periphery of the external static pressure pocket (24), are formed on the surface of a piston shoe (9) that slides on a swash plate (10). The inner peripheral land portion (22) is annularly formed around the fill opening (9A). Oil passing grooves (27) through which the internal static pressure pocket (23) communicates with the external static pressure pocket (24), are formed in parts of the inner peripheral land portion (22), on straight lines passing through the center of the fill opening (9A). The oil passing grooves (27) are inclined with respect to the straight line A-B passing through the center of the fill opening (9A). The inner wall surface and the outer wall surface of the inner peripheral land portion (22) are disposed on straight lines connecting the center of the fill opening (9A) to the centers of the oil passing grooves (27).

Inventors:
HEMMI MAKOTO (JP)
AKITA HIDEKI (JP)
SUZUKI MOTOSHI (JP)
SUZUKI KENTA (JP)
Application Number:
PCT/JP2010/068736
Publication Date:
May 05, 2011
Filing Date:
October 22, 2010
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
HEMMI MAKOTO (JP)
AKITA HIDEKI (JP)
SUZUKI MOTOSHI (JP)
SUZUKI KENTA (JP)
International Classes:
F04B1/22; F03C1/253
Foreign References:
GB983310A1965-02-17
JPH021476U1990-01-08
JPS5842103U1983-03-19
JPH1150950A1999-02-23
JPH01105095A1989-04-21
Attorney, Agent or Firm:
The Patent Body Corporate TAKEWA INTERNATIONAL PATENT OFFICE (JP)
Patent business corporation Takekazu international patent firm (JP)
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