Method of treating composite piston pin and surface treated composite piston pin

Abstract

Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

1 - 5 . (canceled) 
     
     
         6 . A surface treated composite piston pin, comprising:
 a composite inside layer configured to have a pipe shape and include a reinforcing fiber and a resin;   a composite outside layer configured to be connected to the composite inside layer along an outside surface of the composite inside layer, have surface roughness Ra equal to or less than 0.42 μm, and include a reinforcing fiber having elasticity higher than that of the reinforcing fiber of the composite inside layer and a resin; and   a coating layer configured to be coated on a surface of the composite outside layer to reduce a friction coefficient.   
     
     
         7 . The surface treated composite piston pin of  claim 6 , wherein the coating layer includes:
 a bonding layer configured to be deposited on the surface of the composite outside layer and made of Cr or Ti;   a support layer configured to be deposited on the bonding layer and made of CrN or WC; and   a functional layer configured to be deposited on the support layer and made of (SiO)-DLC.   
     
     
         8 . The surface treated composite piston pin of  claim 6 , wherein the resin included in the composite inside layer and the composite outside layer includes an epoxy mixture and cyanate ester. 
     
     
         9 . The surface treated composite piston pin of  claim 6 , wherein the reinforcing fiber of the composite outside layer is aligned in parallel with a longitudinal direction of a pipe, and
 the composite inside layer includes:   a first layer configured to include a reinforcing fiber vertically aligned to the reinforcing fiber of the composite outside layer and be connected to the composite outside layer along an inner side surface of the composite outside layer; and   a second layer configured to include a reinforcing fiber aligned in parallel with the reinforcing fiber of the composite outside layer and be connected to the first layer along an inner side surface of the first layer.