Wear-resistant slide member and slide device using the same

Abstract

An object of the present invention is to provide a wear-resistant sliding part with a wear-resistant member to reduce wear of contacting portions of two parts which moves in linkage with each other such as a valve bridge and a rocker arm in a valve train system of a diesel engine, wherein the wear-resistant member is held in a recess of a receiving part securely not to fall off and allowed in the recess to rotate and move in the parallel direction to its bottom surface. Also the wear-resistant member is arranged with at least one of the following: a chamfer provided at the perimeter of bottom surface; the bottom surface with the flatness from 0.05 to 0.20 μm and a convex shape of a raised-up outer side; and at least one of the bottom, side, and top surfaces having surface roughness (Ra) of 0.2 μm or less.

1 . A wear-resistant sliding part comprising: 
 a first part and a second part that move in linkage with each other; and    a wear-resistant member that stands in between contacting portions of the two parts;    wherein said wear-resistant member is inserted in a recess provided in the second part in a state in which it is protected from falling off and it is allowed in the recess to rotate and move in a parallel direction to a bottom surface of the recess;    wherein a bottom surface of the wear-resistant member makes contact with the bottom surface of the recess and the first part makes contact with the top surface of the wear-resistant member, allowing the first and the second parts to move; and    wherein a perimeter of the bottom surface of said wear-resistant member has a chamfer that eliminates a sharp edge.    
     
     
         2 . The wear-resistant sliding part according to  claim 1 , wherein the chamfer at the perimeter of the bottom surface of said wear-resistant member is larger than a rounded fillet or a flat fillet of said recess.  
     
     
         3 . The wear-resistant sliding part according to  claim 1 , wherein a chamfer is also formed to eliminate a sharp edge at a perimeter of a top surface of said wear-resistant member.  
     
     
         4 . A wear-resistant sliding part comprising: 
 a first part and a second part that move in linkage with each other, and    a wear-resistant member that stands in between contacting portions of the two parts;    wherein said wear-resistant member is inserted in a recess provided in the second part in a state in which it is protected from falling off from the recess and it is allowed in the recess to rotate and move in a parallel direction to a bottom surface of the recess;    wherein a bottom surface of the wear-resistant member makes contact with the bottom surface of the recess and the first part makes contact with the top surface of the wear-resistant member, allowing the first and the second parts to move; and    wherein the bottom surface of said wear-resistant member making contact with an inner radial surface of said recess has a flatness in the range of 0.05 to 20 μm and a convex shape of which outer side is raised up at the perimeter side.    
     
     
         5 . The wear-resistant sliding part according to  claim 4 , wherein the flatness of the bottom surface of said wear-resistant member is larger than that of the bottom surface of the recess provided for said second part.  
     
     
         6 . A wear-resistant sliding part comprising: 
 a first part and a second part that move in linkage with each other; and    a wear-resistant member that stands in between contacting portions of the two parts;    wherein said wear-resistant member is inserted in a recess provided in the second part in a state in which it is protected from falling off from the recess and it is allowed in the recess to rotate and move in a parallel direction to a bottom surface of the recess;    wherein the bottom surface of the wear-resistant member makes contact with the bottom surface of the recess and the first part makes contact with the top surface of the wear-resistant member, allowing the first and the second parts to move; and    wherein at least one of the bottom surface of the wear-resistant member making contact with the bottom surface of said recess, a side surface of the wear-resistant member making contact with an inner radial surface of said recess, and a top surface of the wear-resistant member making contact with said first part has a surface roughness (Ra) of 0.2 μm or less.    
     
     
         7 . The wear-resistant sliding part according to any one of  claim 1  through  6 , wherein the difference between an outer diameter of said wear-resistant member and an inner diameter of said recess is 0.03 mm or more.  
     
     
         8 . The wear-resistant sliding part according to  claim 4 , wherein the difference between an outer diameter of said wear-resistant member and an inner diameter of said recess is 0.03 mm or more.  
     
     
         9 . The wear-resistant sliding part according to  claim 6 , wherein the difference between an outer diameter of said wear-resistant member and an inner diameter of said recess is 0.03 mm or more.  
     
     
         10 . The wear-resistant sliding part according to  claim 1 , wherein said wear-resistant member is made from materials including silicon nitride ceramics.  
     
     
         11 . The wear-resistant sliding part according to  claim 4 , wherein said wear-resistant member is made from materials including silicon nitride ceramics.  
     
     
         12 . The wear-resistant sliding part according to  claim 6 , wherein said wear-resistant member is made from materials including silicon nitride ceramics.  
     
     
         13 . The wear-resistant sliding part according to  claim 1 , wherein the two parts moving in linkage with each other are a valve bridge and a rocker arm in a valve train system of a diesel engine, wherein said wear-resistant member is inserted into the recess provided at an upper portion of the valve bridge and a tip of the wear-resistant member is arranged to make contact with the rocker arm.  
     
     
         14 . The wear-resistant sliding part according to  claim 4 , wherein the two parts moving in linkage with each other are a valve bridge and a rocker arm in a valve train system of a diesel engine, wherein said wear-resistant member is inserted into the recess provided at an upper portion of the valve bridge and a tip of the wear-resistant member is arranged to make contact with the rocker arm.  
     
     
         15 . The wear-resistant sliding part according to  claim 6 , wherein the two parts moving in linkage with each other are a valve bridge and a rocker arm in a valve train system of a diesel engine, wherein said wear-resistant member is inserted into the recess provided at an upper portion of the valve bridge and a tip of the wear-resistant member is arranged to make contact with the rocker arm.  
     
     
         16 . A sliding mechanism using the sliding part according to  claim 1 .  
     
     
         17 . A sliding mechanism using the sliding part according to  claim 4 .  
     
     
         18 . A sliding mechanism using the sliding part according to  claim 6.