Swash plate for compresser

Abstract

A swash plate used in a compressor. A side of the swash plate that contacts head side shoes is coated with two layers. The first layer is formed of aluminum material and the second layer is formed with solid lubricant. A side of the swash plate that contacts skirt side shoes is coated with a single layer of solid lubricant. Accordingly, the swash plate has a sufficiently wear resistance on both sides for the minimized cost.

What is claimed is:  
     
         1 . A swash plate used in a compressor, the swash plate is mounted on a drive shaft and coupled to a single-head piston to convert a rotational movement of the drive shaft to a linearly reciprocal movement of the piston, the piston having a head portion compressing gas and receiving reaction force from the gas and a skirt portion accommodating a first shoe and a second shoe opposed to each other, the first shoe being disposed closer to the piston head than the second shoe, the first shoe and the second shoe being respectively kept in a slidable contact with a first contact surface and a second contact surface opposed to each other in the swash plate, the swash plate comprising: 
 a first coating formed on the first contact surface, the first coating being made of an aluminum based material; and    a second coating formed on the second contact surface, the second coating material being made of a material simpler for production than the aluminum based material.    
     
     
         2 . The swash plate as set forth in  claim 1 , wherein the second coating is made of one of a rigid lubrication layer, a plating layer and a sinter.  
     
     
         3 . The swash plate as set forth in  claim 1 , wherein the first coating is formed on the first contact surface by one selected from a group consisting of a pressure welding, a welding and a flame spraying.  
     
     
         4 . The swash plate as set forth in  claim 1 , wherein the first contact surface is finished by roughening.  
     
     
         5 . The swash plate as set forth in  claim 1 , wherein the first coating is coated by a rigid lubrication layer.  
     
     
         6 . The swash plate as set forth in  claim 5 , wherein the first coating has a roughened surface.  
     
     
         7 . A swash plate used in a compressor, the swash plate is mounted on a drive shaft and coupled to a single-head piston to convert a rotational movement of the drive shaft to a linearly reciprocal movement of the piston, the piston having a head portion compressing gas and receiving reaction force from the gas and a skirt portion accommodating a first shoe and a second shoe opposed to each other, the first shoe being disposed closer to the piston head than the second shoe, the first shoe and the second shoe being respectively kept in a slidable contact with a first contact surface and a second contact surface opposed to each other in the swash plate, the swash plate comprising: 
 a first coating formed on the first contact surface, the first coating being made of an aluminum based material; and    a second coating formed on the second contact surface, the second coating material being made of one of a rigid lubrication layer and a plating layer.    
     
     
         8 . The swash plate as set forth in  claim 7 , wherein the first coating is made of an aluminum alloy containing silicon.  
     
     
         9 . The swash plate as set forth in  claim 7 , wherein the first coating includes a first layer made of an aluminum alloy containing silicon and a second layer formed on the first layer and made of a rigid lubrication agent.  
     
     
         10 . The swash plate as set forth in  claim 9 , wherein the first layer is formed of the aluminum alloy containing 10 to 20 weight percent of the silicon.