Heat exchanger for vehicle

Abstract

A heat exchanger for a vehicle may include a heat radiating portion provided with first and second connecting lines formed alternately by stacking plates, and receiving first and second operating fluids into the first and second connecting lines, a bifurcating portion connecting an inflow hole for flowing one operating fluid of the first and second operating fluids with an exhaust hole for exhausting the one operating fluid, and adapted for the one operating fluid to bypass the heat radiating portion according to a temperature of the one operating fluid, and a valve unit mounted corresponding to the inflow hole and adapted to flow the one operating fluid selectively to the heat radiating portion or the bifurcating portion according to the temperature of the one operating fluid flowing in the inflow hole.

1 - 18 . (canceled) 
     
     
         19 : A heat exchanger for a vehicle, comprising:
 a heat radiating portion provided with first and second connecting lines formed alternately by stacking a plurality of plates, and receiving first and second operating fluids into the first and second connecting lines respectively, the first and second operating fluids heat-exchanging with each other during passing through the first and second connecting lines; and   a bifurcating portion fluid-connecting an inflow hole for flowing one operating fluid of the first and second operating fluids with an exhaust hole for exhausting the one operating fluid, and adapted for the one operating fluid to bypass the heat radiating portion according to a flow amount of the one operating fluid.   
     
     
         20 : The heat exchanger of  claim 19 , wherein the first operating fluid flows into the heat radiating portion through a first inflow hole and flows out from the heat radiating portion through a first exhaust hole, and the first inflow hole is connected to the first exhaust hole through the first connecting line,
 the second operating fluid flows into the heat radiating portion through a second inflow hole and flows out from the heat radiating portion through a second exhaust hole, and the second inflow hole is connected to the second exhaust hole through the second connecting line,   the first and second inflow holes are formed at both sides of a surface of the heat radiating portion along a length direction, and   the first and second exhaust holes are distanced from the first and second inflow holes and are formed at the both sides of the surface of the heat radiating portion along the length direction.   
     
     
         21 : The heat exchanger of  claim 20 , wherein the bifurcating portion connects the first inflow hole with the first exhaust hole, and is protruded from a surface of the heat radiating portion such that the bifurcating portion is positioned higher than the heat radiating portion. 
     
     
         22 : The heat exchanger of  claim 20 , wherein the first operating fluid is a coolant coming from a radiator and the second operating fluid is a transmission oil coming from an automatic transmission. 
     
     
         23 : The heat exchanger of  claim 22 , wherein the coolant circulates through the first inflow hole, the first connecting line, and the first exhaust hole, and the transmission oil circulates through the second inflow hole, the second connecting line, and the second exhaust hole. 
     
     
         24 : The heat exchanger of  claim 23 , wherein the bifurcating portion is provided with a bypass line bifurcated from the first inflow hole and adapted to flow the coolant flowing in the bifurcating portion through the first inflow hole to the first exhaust hole directly. 
     
     
         25 : The heat exchanger of  claim 19 , wherein the heat radiating portion heat-exchanges the first and second operating fluids by counterflow of the first and second operating fluids.