Compressor provided with sliding bearing

Abstract

A compressor includes a housing, a compression mechanism, a rotary unit and a sliding bearing. The compression mechanism compresses refrigerant in the housing. The rotary unit drives the compression mechanism. The sliding bearing is supported in the housing while rotatably supporting the rotary unit. The sliding bearing has a base member, porous metal layer and fluoro resin layer. The surface of the base member is coated with the porous metal layer having solid lubricating performance. The surface is coated with the fluoro resin layer through the porous metal layer.

What is claimed is:  
     
         1 . A compressor comprising: 
 a housing;    a compression mechanism in the housing for compressing refrigerant;    a rotary unit for driving the compression mechanism; and    a sliding bearing supported in the housing, the sliding bearing rotatably supporting the rotary unit, the sliding bearing including; 
 a base member,  
 porous metal layer for coating a surface of the base member, the porous metal layer having solid lubricating performance, and  
 fluoro resin layer for coating the surface through the porous metal layer.  
   
     
     
         2 . The compressor according to  claim 1  wherein the sliding bearing is a radial sliding bearing which supports the rotary unit in a radial direction.  
     
     
         3 . The compressor according to  claim 1  wherein the sliding bearing is a thrust sliding bearing which supports the rotary unit in a thrust direction, and wherein the thrust sliding bearing is arranged so as to receive compression reactive force generated by the compression mechanism through the rotary unit.  
     
     
         4 . The compressor according to  claim 1  wherein the sliding bearing separates inside of the housing in pressure.  
     
     
         5 . The compressor according to  claim 1  wherein the porous metal layer is made of bronze.  
     
     
         6 . The compressor according to  claim 1  wherein the fluoro resin layer is PTFE.  
     
     
         7 . The compressor according to  claim 1  wherein the porous metal layer is sintered bronze layer and the fluoro resin layer is PTFE and wherein the thickness of the surface of the PTFE which has not occupied porosity formed in the sintered bronze layer and the thickness of the sintered bronze layer are respectively predetermined to be approximately 30 μm and 220 μm.  
     
     
         8 . The compressor according to  claim 1  wherein the rotary unit is made of iron.  
     
     
         9 . The compressor according to  claim 1  wherein the base member is made of iron.  
     
     
         10 . The compressor according to  claim 1  wherein the compression mechanism includes a plurality of cylinder bores, a piston accommodated in each of the cylinder bores, and a crank mechanism for reciprocating the piston in each of the cylinder bores based on rotation of the rotary unit, the housing including a crank chamber for accommodating the crank mechanism and the sliding bearing, the refrigerant compressed by the compression mechanism being introduced into the crank chamber, a stroke amount of the piston being varied by adjusting pressure in the crank chamber.  
     
     
         11 . The compressor according to  claim 10  wherein the piston is a single-headed piston, the crank mechanism including a hinge mechanism, rotation of the rotary unit being transmitted to the single-headed piston through the hinge mechanism by the crank mechanism.  
     
     
         12 . The compressor according to  claim 1  wherein the compression mechanism includes a plurality of cylinder bores, a piston accommodated in each of the cylinder bores, and a crank mechanism for reciprocating the piston in each of the cylinder bores based on rotation of the rotary unit, the housing including a crank chamber for accommodating the crank mechanism and the sliding bearing, the crank chamber constituting a refrigerant route in the housing.  
     
     
         13 . The compressor according to  claim 12  wherein the piston is a double-headed piston for compressing the refrigerant at both ends of the piston, the crank mechanism being arranged between the ends.  
     
     
         14 . The compressor according to  claim 1  wherein the compression mechanism is a scroll type compression mechanism.  
     
     
         15 . The compressor according to  claim 14  further comprising an electric motor for driving the scroll type compression mechanism.  
     
     
         16 . The compressor according to  claim 1  wherein the rotary unit includes at least one of a drive shaft, a lug plate and a swash plate.  
     
     
         17 . A sliding bearing for rotatably supporting a rotary unit comprising; 
 a base member,    porous metal layer for coating a surface of the base member, the porous metal layer having solid lubricating performance, and    fluoro resin layer for coating the surface through the porous metal layer.    
     
     
         18 . The sliding bearing according to  claim 17  wherein the sliding bearing is a radial sliding bearing which supports the rotary unit in a radial direction.  
     
     
         19 . The sliding bearing according to  claim 17  wherein the sliding bearing is a thrust sliding bearing which supports the rotary unit in a thrust direction.  
     
     
         20 . The sliding bearing according to  claim 17  wherein the porous metal layer is made of bronze.  
     
     
         21 . The sliding bearing according to  claim 17  wherein the fluoro resin layer is PTFE.  
     
     
         22 . The sliding bearing according to  claim 17  wherein the porous metal layer is sintered bronze layer and the fluoro resin layer is PTFE.  
     
     
         23 . The sliding bearing according to  claim 17  wherein the rotary unit is made of iron.  
     
     
         24 . The sliding bearing according to  claim 17  wherein the base member is made of iron.