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Title:
RADIAL PISTON HYDRAULIC MACHINE, HYDRAULIC PRESSURE GEAR TRANSMISSION, AND WIND POWER GENERATOR
Document Type and Number:
Japanese Patent JP2016050565
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a radial piston hydraulic machine having extended life span of a roller or a cam by maintaining the oil film between a roller surface and a cam surface.SOLUTION: A radial piston hydraulic machine comprises: at least one piston disposed along the radial direction of the hydraulic machine; a roller rotatably provided in the piston having a roller surface; and a cam having a cam surface disposed to face the roller surface via the oil film of lube oil, in which the roller surface or the cam surface has isotropic surface roughness or surface roughness with anisotropy in a direction along the axis of rotation of the cam; and the speed of the roller surface or the cam surface associated with the rotation of the roller or the cam is set to such a condition Λ value defined by the following formula is to be 0 to 1.0, in which Λ=t/(Ra1+Ra2)where t is the thickness of the oil film, Ra1 is the surface roughness of the roller surface, and Ra2 is the surface roughness of the cam surface.SELECTED DRAWING: Figure 1

Inventors:
TAKEUCHI HIROAKI
YOSHIDA TAKAFUMI
OCHIAI HIROYASU
Application Number:
JP2014178135A
Publication Date:
April 11, 2016
Filing Date:
September 02, 2014
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
F04B1/04; F03C1/053; F03D1/06; F03D9/28
Domestic Patent References:
JPH06137406A1994-05-17
JP2014521858A2014-08-28
JPH0798052A1995-04-11
JP2004332896A2004-11-25
Foreign References:
US6237441B12001-05-29
US20130199331A12013-08-08
Attorney, Agent or Firm:
Seishin ip patent business corporation