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Patent Searching and Data


Title:
AXIAL PISTON-TYPE HYDRAULIC ROTARY MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/163504
Kind Code:
A1
Abstract:
According to the present invention, a nitrided layer (13) is formed on the base material surface side of a cylinder block (7) including an opening-side end surface (7B) and each of cylinder holes (12). In addition, a piston sliding surface (12A) of each of the cylinder holes (12) is formed as a compound layer-removed hole (17) by using a polishing means, such as honing for example, to remove a compound layer (16) located on the surface side of the nitrided layer (13). In addition, in a portion (A) at which the compound layer-removed hole (17) of each cylinder hole (12) and a tapered surface (12B) in the cylinder entrance intersect, a compound layer-removed surface (18) is formed by using a polishing means such as, for example, honing. This compound layer-removed surface (18) is formed as an inclined surface with a tapered shape having an angle α.

Inventors:
YAMADA Tsuyoshi (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
YABUUCHI Yoshitomo (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
OKUNO Naoyuki (Hitachi Construction Machinery Co. Ltd., 650, Kandatsumachi, Tsuchiura-sh, Ibaraki 13, 〒3000013, JP)
Application Number:
JP2017/039839
Publication Date:
September 13, 2018
Filing Date:
November 03, 2017
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY CO., LTD. (16-1, Higashiueno 2-chome Taito-k, Tokyo 15, 〒1100015, JP)
International Classes:
F04B1/24; F03C1/24; F03C1/253; F04B1/22
Foreign References:
JP2012007509A2012-01-12
JPS56105675U1981-08-18
JPS58111375U1983-07-29
Attorney, Agent or Firm:
HIROWA PATENT FIRM (4F. Nishishinjuku Koide Bldg, 1-3 Nishishinjuku 3-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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