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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 (HITACHI LTD., 832-2, Horiguchi, Hitachinaka-sh, Ibaraki 34, 〒3120034, JP)
辺見 真 (〒34 茨城県ひたちなか市堀口832番地2 株式会社日立製作所 機械研究所内 Ibaraki, 〒3120034, JP)
AKITA Hideki (HITACHI CONSTRUCTION MACHINERY CO. LTD., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
秋田 秀樹 (〒13 茨城県土浦市神立町650番地 日立建機株式会社 土浦工場 知的財産部内 Ibaraki, 〒3000013, JP)
Application Number:
JP2010/068736
Publication Date:
May 05, 2011
Filing Date:
October 22, 2010
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (5-1 Koraku 2-chome, Bunkyo-ku Tokyo, 63, 〒1128563, JP)
日立建機株式会社 (〒63 東京都文京区後楽二丁目5番1号 Tokyo, 〒1128563, JP)
HEMMI Makoto (HITACHI LTD., 832-2, Horiguchi, Hitachinaka-sh, Ibaraki 34, 〒3120034, JP)
辺見 真 (〒34 茨城県ひたちなか市堀口832番地2 株式会社日立製作所 機械研究所内 Ibaraki, 〒3120034, JP)
AKITA Hideki (HITACHI CONSTRUCTION MACHINERY CO. LTD., Tsuchiura Works, 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, 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 (Kashiwaya Bldg, 6-13 Nishishinbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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