Split type connecting rod

Abstract

A split type connecting rod has a simple structure that is capable of suppressing rotation of a metal bearing, and avoiding problems such as burning. The split type connecting rod holds a crank-pin through a metal bearing which has locking lugs. A bearing locking groove locks at least one of the locking lugs when the metal bearing rotates forward in the circumferential direction of a crank-pin hole. A bearing locking groove locks at least one of the locking lugs when the metal bearing rotates backward. The bearing locking grooves are deviated from each other in the circumferential direction.

1 . A split connecting rod that holds a crank-pin through a bearing having a first protrusion and a second protrusion, comprising: 
 a first locking groove that locks the first protrusion of said bearing when said bearing rotates forward in a circumferential direction of a crank-pin hole;    a second locking groove that locks the second protrusion of said bearing when said bearing rotates backward in the circumferential direction of the crank-pin hole; wherein    the split connecting rod includes only the first locking groove and the second locking groove on a first side of the crank-pin hole and no locking grooves on a second side of the crank-pin hole.    
   
   
       2 . The split connecting rod according to  claim 1 , further comprising a large end portion including a rod portion and a cap portion, wherein said first locking groove and said second locking groove are arranged to extend over both of the rod portion and the cap portion when a large end portion is fractured and split into said rod portion and said cap portion, said first locking groove being deviated to said rod portion side and said second locking groove is deviated to said cap portion side.  
   
   
       3 . The split connecting rod according to  claim 1 , wherein when said bearing is split, said first protrusion locked by said first locking groove and said second protrusion locked by said second locking groove are arranged separately on separate portions of said bearing that has been split.  
   
   
       4 . The split connecting rod according to  claim 1 , wherein the bearing is substantially ring-shaped and disposed on an inner circumferential surface of the crank-pin hole.  
   
   
       5 . The split connecting rod according to  claim 1 , wherein the bearing includes a rod portion and a cap portion which are divided along a splitting line of said bearing.  
   
   
       6 . The split connecting rod according to  claim 1 , wherein the first and second locking grooves are substantially arc-shaped.  
   
   
       7 . The split connecting rod according to  claim 1 , wherein the first and second locking grooves are arranged to prevent the bearing from moving in said circumferential direction.  
   
   
       8 . The split connecting rod according to  claim 1 , wherein the first locking groove and the second locking groove are arranged inwardly from an edge of the crank-pin hole in an axial direction of the crank-pin hole.  
   
   
       9 . The split connecting rod according to  claim 1 , wherein the first and second locking grooves are arranged to prevent the bearing from moving in an axial direction of the crank-pin hole.