Sliding Element and Fluid Machine

Abstract

A lubrication part serving as a bearing metal is provided in a scroll compressor at a sliding part between a cylindrical part of a slide busing and an extension of a movable scroll. An inner periphery of the lubrication part is formed so that its iron substrate is given a surface roughness Ra of 3.7 μm and a resin layer containing FEP and PTFE is then provided on the roughened substrate surface.

1 . A sliding element comprising: 
 a fluororesin-containing resin layer on a surface of a metal substrate, the surface of the substrate being subjected to surface roughening to have a surface roughness larger than 0.5 μm and smaller than 10 μm in terms of the arithmetic mean height Ra of the profile of the surface.    
   
   
       2 . The sliding element of  claim 1 , wherein 
 the surface of the substrate is subjected to surface roughening to have a surface roughness larger than 0.75 μm and smaller than 10 μm in terms of the arithmetic mean height Ra of the profile of the surface.    
   
   
       3 . The sliding element of  claim 1 , wherein 
 the surface roughening includes a conversion treatment.    
   
   
       4 . The sliding element of  claim 1 , wherein 
 the resin layer contains polyamide-imide resin.    
   
   
       5 . The sliding element of  claim 1 , wherein 
 a surface layer of the substrate is subjected to no hardening.    
   
   
       6 . A fluid machine comprising: 
 a sliding element including a fluororesin-containing resin layer on at least part of a surface of a metal substrate,    the surface of the substrate under the resin layer being subjected to surface roughening to have a surface roughness larger than 0.5 μm and smaller than 10 μm in terms of the arithmetic mean height Ra of the profile of the surface.    
   
   
       7 . The fluid machine of  claim 6 , wherein 
 the surface of the substrate under the resin layer is subjected to surface roughening to have a surface roughness larger than 0.75 μm and smaller than 10 μm in terms of the arithmetic mean height Ra of the profile of the surface.    
   
   
       8 . The fluid machine of  claim 6 , wherein 
 the surface roughening includes a conversion treatment.    
   
   
       9 . The fluid machine of  claim 6 , wherein 
 the resin layer contains polyamide-imide resin.    
   
   
       10 . The fluid machine of  claim 6 , wherein 
 the sliding element is exposed to refrigerant.    
   
   
       11 . The fluid machine of  claim 10 , wherein 
 the refrigerant contains a fluorine-containing material.    
   
   
       12 . The fluid machine of  claim 10 , wherein 
 the mixture ratio of lubricant to the refrigerant is 5% or less.    
   
   
       13 . The fluid machine of  claim 10 , wherein 
 substantially no lubricant is mixed in the refrigerant.    
   
   
       14 . The fluid machine of  claim 6 , further comprising 
 a scroll mechanism including a pair of scrolls meshing with each other,    at least one of the pair of scrolls constituting the sliding element, and    the scroll constituting the sliding element includes the resin layer on at least part of a surface of a metal substrate.    
   
   
       15 . The fluid machine of  claim 14 , wherein 
 the scroll constituting the sliding element is a movable scroll, and    the resin layer is directly formed on a bearing part of the movable scroll.    
   
   
       16 . The fluid machine of  claim 14 , wherein 
 the scroll constituting the sliding element is a movable scroll, and    the resin layer is directly formed on the entire movable scroll.    
   
   
       17 . The fluid machine of  claim 14 , wherein 
 the scroll constituting the sliding element is a movable scroll, and    the resin layer is directly formed on a movable wrap of the movable scroll.    
   
   
       18 . The fluid machine of  claim 14 , wherein 
 the scroll constituting the sliding element is a fixed scroll, and    the resin layer is directly formed on an entire surface of the fixed scroll opposed to the movable scroll.    
   
   
       19 . The fluid machine of  claim 6 , further comprising 
 a scroll mechanism including a pair of scrolls meshing with each other,    a thrust bearing of a movable scroll of the pair of scrolls constituting the sliding element, and    the thrust bearing including the resin layer directly formed on a sliding surface of the thrust bearing on the movable scroll.