Core structure of housingless-type oil cooler

Abstract

A housingless-type oil cooler includes cooling elements having first and second plates coupled with together, an oil return tube vertically arranged through a core portion, and a heat-transfer suppressing means. The cooling elements are piled up in a vertical direction of the core portion to alternately form cooling water chambers and oil chambers so that the adjacent cooling water chambers are fluidically connected through a cooling water passage and the adjacent oil chambers are fluidically connected through an oil passage. The oil return tube discharges oil introduced from one side of the core portion toward its other side through the oil chambers and the oil passages. The heat-transfer suppressing means is arranged between the oil chambers and the oil return tube to suppress heat transfer between the oil flowing in the oil chambers and the oil flowing in the oil return tube.

1 . A core structure of a housingless-type oil cooler comprising: 
 a plurality of cooling elements, each of the cooling elements including a first plate and a second plate that are coupled with each other, the cooling elements being piled up in a vertical direction of a core portion to alternately form cooling water chambers and oil chambers so that the adjacent cooling water chambers are fluidically connected with each other through a cooling water passage and the adjacent oil chambers are fluidically connected with each other through an oil passage;    an oil return tube that is arranged in the vertical direction through the core portion to discharge oil introduced from one side of the core portion toward the other side of the core portion through the oil chambers and the oil passages; and    a heat-transfer suppressing means that is arranged between the oil chambers and the oil return tube to suppress heat transfer between the oil flowing in the oil chambers and the oil flowing in the oil return tube.    
   
   
       2 . The core structure according to  claim 1 , wherein 
 the heat-transfer suppressing means is a heat-transfer suppressing chambers that are arranged between the oil chambers and the oil return tube and are fluidically connected with the cooling water chambers.    
   
   
       3 . The core structure according to  claim 1 , wherein 
 the heat-transfer suppressing means is a heat-transfer suppressing chambers that are arranged between the oil chambers and the oil return tube and are filled with air.