Patent ID: 8579143

Claim:
A reserve tank comprising: a tank main body that has a plurality of chambers partitioned by partition walls, an inflow port that allows coolant to flow into the tank main body, and an outflow port that allows the coolant to flow out of the tank main body, the plurality of the chambers including a first chamber and a second chamber partitioned by the partition walls, and a third chamber that is provided with the inflow port and the third chamber accumulates the coolant that flows from the inflow port, the first chamber having a first communicating portion formed to allow the coolant to flow into the second chamber, the third chamber having a second communicating portion formed to allow the accumulated coolant from the inflow port to flow into the first chamber, wherein the first communicating portion being dimensioned to have a first pressure loss of the coolant passing through the first communicating portion and a first flow rate of the coolant passing through the first communicating portion, and the second communicating portion being dimensioned to have a second pressure loss of the coolant passing through the second communicating portion and a second flow rate of the coolant passing through the second communicating portion, and wherein the second flow rate is smaller than the first flow rate and the second pressure loss is greater than the first pressure loss so as to generate a difference in a level of the coolant between the first chamber and the second chamber.