Oil cooler

Abstract

An oil cooler includes a pair of spaced inlet/outlet boss portions; an inlet pipe and an outlet pipe coupled to the inlet/outlet boss portions, respectively; and tubes coupled to the inlet/outlet boss portions through both ends thereof to form an oil flow passage. The tubes are disposed in parallel and in a multi-stage arrangement. Each tube has a portion in fluid flow relationship with the neighboring tube at an area between the inlet and outlet pipes so oil can flow between them.

1 . An oil cooler, comprising,
 a pair of inlet/outlet boss portions spaced from each other at a predetermined distance;   an inlet pipe and an outlet pipe coupled to the inlet/outlet boss portions, respectively; and   tubes fixed by the inlet/outlet boss portions through both ends thereof to form an oil flow passage,   wherein the tubes are disposed in parallel and in a multi-stage and the tube is formed with a communicating portion for communicating the tube with the neighboring tube at an area between the inlet pipe and the outlet pipe to allow oil to be flowed therebetween.   
   
   
       2 . The oil cooler as set forth in  claim 1 , wherein the plurality of communicating portions are formed in the longitudinal direction of the tube. 
   
   
       3 . The oil cooler as set forth in  claim 2 , wherein the communicating portions are formed on one line in the stacking direction of the tubes. 
   
   
       4 . The oil cooler as set forth in  claim 1 , wherein the communicating portions are formed on an area of all the tubes in the direction perpendicular to a flow direction of oil in the tube to allow oil flowed in the specific tube to be flowed into all other tubes through the communicating portions. 
   
   
       5 . The oil cooler as set forth in  claim 4 , wherein the flow direction of oil flowed upstream of the communicating portion is the same as that of oil flowed downstream of the communicating portion in the tubes. 
   
   
       6 . The oil cooler as set forth in  claim 4 , wherein the tube is formed by coupling an upper plate to a lower plate, one of two neighboring tubes has a first protrusion portion formed on the plate thereof and protruded perpendicularly toward the other tube, the other tube has a second protrusion portion formed on the plate thereof, protruded perpendicularly toward one tube and being closely contacted with an inner surface or an outer surface of the first protrusion portion, and the communicating portion is formed by coupling the first protrusion portion to the second protrusion portion. 
   
   
       7 . The oil cooler as set forth in  claim 4 , wherein the tube has an hollow portion formed by cutting out some area thereof, the hollow portions of the tubes correspond to each other in the stacking direction of the tubes and a communicating member connecting the hollow portions of the neighboring tubes to each other is formed to form the communicating portion. 
   
   
       8 . The oil cooler as set forth in  claim 1 , wherein the tube comprises an inner fin provided therein. 
   
   
       9 . The oil cooler as set forth in  claim 8 , wherein the inner fin has an fin-free portion formed by cutting out some area thereof and formed at a place corresponding to the communicating portion to allow oil flowed in the communicating portion to be flowed smoothly. 
   
   
       10 . The oil cooler as set forth in  claim 8 , the inner fin comprises first rows and second rows disposed alternately and repeatedly, wherein the second row has the same configuration as the first row and is spaced apart from a reference of the first partition portions of the first rows at a predetermined distance, the first row comprises a plurality of first partition portions protruded perpendicularly and upwardly from a plane portion, extending portions extended perpendicularly from the first partition portions and paralleled with the plane portions and second partition portions extended perpendicularly and downwardly from the extending portion and paralleled with the first partition portions, wherein the first partition portions, the extending portions and the second partition portions are disposed repeatedly in the first row. 
   
   
       11 . The oil cooler as set forth in  claim 10 , wherein the inner fin is disposed such that the first partition portion and the second partition portion are parallel with a flow direction of oil flowed in the oil cooler. 
   
   
       12 . An oil cooler, comprising a pair of inlet pipe and outlet pipe spaced from each other at a predetermined distance; the tubes connected to the inlet pipe and outlet pipe through both ends thereof to form an oil flow passage; and turbulence generating parts formed on the oil flow passage in the tubes. 
   
   
       13 . The oil cooler as set forth in  claim 12 , wherein the turbulence generating part is a communicating portion through which the neighboring tubes are communicated with each other for allowing oil to be flowed between the tubes. 
   
   
       14 . The oil cooler as set forth in  claim 13 , wherein the communicating portions are formed on an area of all the tubes in the direction perpendicular to a flow direction of oil in the tube to allow oil flowed in the specific tube to be flowed into all other tubes through the communicating portions.