Lubrication device of engine for reducing oil leakage

Abstract

A lubrication device of an engine includes a crankshaft supported and rotatably mounted by a main bearing and disposed at one side of a cylinder block, wherein the crankshaft includes a first main journal and a second main journal at a center in an axial direction, the first main journal being disposed between a first pin journal and a second pin journal, the second main journal being disposed between the second pin journal and a third pin journal, and two oil holes formed at the first main journal, wherein one of the oil holes is extended so as to supply oil to the first pin journal, and another oil hole is extended so as to supply oil to the second pin journal.

What is claimed is: 
     
         1 . A lubrication device of an engine, comprising:
 a crankshaft supported and rotatably mounted by a main bearing and disposed at one side of a cylinder block, wherein the crankshaft includes a first main journal and a second main journal at a center in an axial direction, the first main journal being disposed between a first pin journal and a second pin journal, the second main journal being disposed between the second pin journal and a third pin journal; and   two oil holes formed at the first main journal, wherein one of the oil holes is extended so as to supply oil to the first pin journal, and another oil hole is extended so as to supply oil to the second pin journal.   
     
     
         2 . The lubrication device of  claim 1 , wherein one oil hole is formed at the second main journal and is extended so as to supply oil to the third pin journal. 
     
     
         3 . The lubrication device of  claim 1 , wherein the first main journal is supported by a first main bearing having a slit hole so as to supply oil to the two oil holes and is rotatably mounted to a lower portion of the cylinder block. 
     
     
         4 . The lubrication device of  claim 1 , wherein the two oil holes formed at the first main journal are disposed on one equal circumference with respect to a circumferential direction of the first main journal. 
     
     
         5 . The lubrication device of  claim 1 , wherein the first main journal is rotatably mounted and supported to a first bearing mounting portion of a plurality of bearing mounting portions which are formed at a lower portion of the cylinder block by a first main bearing, and an oil supply hole for supplying oil and an oil groove connected to the oil supply hole together are formed at the first bearing mounting portion. 
     
     
         6 . The lubrication device of  claim 5 , wherein the second main journal is rotatably mounted and supported by the lower portion of the cylinder block by a second main bearing having a hole structure to be the same as the first main bearing, and a third main journal and a fourth main journal, which are formed at both sides in an axial direction of the crankshaft, are respectively supported by a third main bearing and a fourth main bearing having a same hole structure and are rotatably mounted to the lower portion of the cylinder block.