Oil cooler

Abstract

An oil cooler is disclosed. First and second plates are overlappedly joined together to form a plurality of tubes so as form a plurality of oil passages between the two plates. A plurality of the tubes are stacked to form cooling water passages. Embossing strips are repeatedly formed in skew along the length of first and second plates, and the embossing strips are crossed and joined. The embossing strips which are formed outside the tubes are also crossed and joined. Oil inlet/outlet holes are formed on both ends of the first and second plates respectively. Manifold parts of a certain area are formed around the oil inlet/outlet holes, and the embossing strips are preserved intact around the manifold parts. Accordingly, flow disturbances are sufficiently realized in the oil passages and in the cooling water passages owing to the embossing strips. Therefore, the heat exchanges are sufficiently improved between the oil and the cooling water, which flow through the radiator. Further, in the manifold parts, the area loaded with the oil pressure is reduced, thereby improving the oil pressure withstanding strength.

What is claimed is:  
     
         1 . An oil cooler comprising: 
 first and second plates joined together to form tubes of oil passages;    the tubes being stacked in a plurality to form cooling water passages between them;    the first and second plates being embossed in a lateral direction in skew to form a plurality of embossing strips, and the embossing strips being repeatedly formed along a length of each of the first and second plates;    the embossing strips of the first and second plates being crossed and joined, and adjacent embossing strips (adjacent to the joined couple of the first and second plates) being also mutually crossed and joined; and    oil inlet /outlet holes formed in both ends of the first and second plates, manifold parts of a certain area formed around the i/o holes, and the embossing strips being preserved around the manifold parts.    
     
     
         2 . The oil cooler as claimed in  claim 1 , wherein a projected outer faces of each of the embossing strips are flat to make it easy to join and to reinforce a joining strength.  
     
     
         3 . The oil cooler as claimed in  claim 2 , wherein in a sectional view of the embossing strip, a horizontal distance L 1  of a connection face between a flat face and another flat face is same as or larger than a length of the flat face.  
     
     
         4 . The oil cooler as claimed in  claim 1 , wherein the connection face is inclined, and therefore, the embossing strip has a trapezoidal cross section.  
     
     
         5 . The oil cooler as claimed in  claim 1 , wherein the embossing strip is straight.  
     
     
         6 . The oil cooler as claimed in  claim 1 , wherein the embossing strips are bent at their middle to form a V-shape.  
     
     
         7 . The oil cooler as claimed in  claim 1 , wherein a flange is formed around an entire edge of each of the first and second plates so as to form tubes when the first and second plates are joined together.  
     
     
         8 . The oil cooler as claimed in  claim 7 , wherein the flange is provided with a marking part.  
     
     
         9 . The oil cooler as claimed in  claim 8 , wherein the marking part comprises a slot or a bent protuberance.  
     
     
         10 . The oil cooler as claimed in  claim 1 , wherein surrounding each of oil i/o holes of the first and second plates, there are disposed a plurality of embossing protuberances, and therefore, the embossing protuberances of the first and second plates are joined to each other at a same point regardless of a joining direction of the first and second plates.  
     
     
         11 . The oil cooler as claimed in  claim 1 , further comprising: 
 an upper end plate coupled to an uppermost tube set, for increasing an oil pressure withstanding strength;    a pair of tubular connection devices fitted to the upper end plate, for being communicated to the oil inlet/outlet holes; and    an end of each of the tubular connection devices being fitted to the first plate through a tube expansion process before being brazed.    
     
     
         12 . The oil cooler as claimed in  claim 1 , further comprising: a lower end plate coupled to a bottom of a lowermost tube set, for increasing the oil pressure withstanding strength; and a plate of the lowermost tube set not having an oil i/o hole, and the plate being joined to the lower end plate.  
     
     
         13 . The oil cooler as claimed in  claim 11 , wherein bent protuberances are formed on both ends of the upper end plate or the lower end plate, so as to make it easy to assemble.  
     
     
         14 . The oil cooler as claimed in  claim 1 , wherein the oil cooler is made of an aluminum-clad material, and respective joining parts are braze-joined.  
     
     
         15 . The oil cooler as claimed in  claim 1 , wherein the oil cooler is made of stainless steel and the respective joining parts are made of a filler metal plate with a thin copper sheet or nickel sheet, and are braze-joined.