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Patent Searching and Data


Title:
HYDRAULIC ROTARY MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/061608
Kind Code:
A1
Abstract:
A sliding layer (21) of a sintered copper alloy is formed in the sliding surface (12A) of a valve plate (12). That is, the valve plate (12) is formed of a ferrous material such as cast iron or steel, while the sliding surface (12A) constituting the surface of the valve plate (12) is composed of the sliding layer (21). The sliding layer (21) consists of a sintered copper alloy which comprises Cu (copper) and Sn (tin) as main components with the balance containing 2 to 6 wt% of CaF2(calcium fluoride) as an essential component. The average particle diameter of the CaF2 is controlled to 40 to 350μm. On the other hand, the sliding surface (8A) of a cylinder block (8), namely a counterpart sliding surface, is composed of a sliding layer of a ferrous material. That is, the sliding layer (21) of a copper alloy is not formed in the sliding surface (8A).

Inventors:
NUMAGUCHI KAZUHIRO (JP)
NIIDOME TAKASHI (JP)
KOMARU YUTAKA (JP)
OSHITA TOMOYUKI (JP)
Application Number:
PCT/JP2013/077824
Publication Date:
April 24, 2014
Filing Date:
October 11, 2013
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
TOKAI CARBON KK (JP)
International Classes:
F04B1/22; F03C1/24; F03C1/253
Foreign References:
JP2004346417A2004-12-09
JP2008007796A2008-01-17
JP2011052252A2011-03-17
JP2009180376A2009-08-13
Attorney, Agent or Firm:
HIROSE KAZUHIKO (JP)
Kazuhiko Hirose (JP)
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