Axial piston-type hydraulic rotary machine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11396872
APP PUB NO 20210277891A1
SERIAL NO

16330428

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Abstract

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A nitriding layer (13) is formed on the front surface side of a base material of a cylinder block (7) including an opening side end surface (7B) and each cylinder hole (12). Then, a piston sliding surface (12A) of each cylinder hole (12) is formed as a compound layer-removed hole (17) by removing a compound layer (16) that is located on the front surface side of the nitriding layer (13) by using polishing means such as, for example, honing and so forth. Further, a compound layer-removed surface (18) is formed on a part (A) where a compound layer-removed hole (17) and a cylinder inlet side tapered surface (12B) of each cylinder hole (12) intersect by using the polishing means such as, for example, the honing and so forth. This compound layer-removed surface (18) is formed as a tapered-state inclined surface of an angle α.

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTD16-1 HIGASHIUENO 2-CHOME TAITO-KU TOKYO 1100015 ?1100015

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Okuno, Naoyuki Tsuchiura, JP 3 28
Yabuuchi, Yoshitomo Kasumigaura, JP 5 15
Yamada, Tsuyoshi Tsukuba, JP 73 444

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