JP4749294B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device that cools two heating elements, and more particularly, to a cooling device that cools an internal combustion engine and an electronic element mounted on a vehicle.

  Hybrid vehicles using an engine and a motor as drive sources are known. A hybrid vehicle is equipped with a PCU (Power Control Unit), which is a power control unit that supplies power to the motor. The PCU is cooled by a coolant (for example, LLC (Long Life Coolant)) in order to suppress a temperature rise due to an IPM (Intelligent Power Module) configured by an internal electric circuit (power element). The PCU coolant is circulated between a dedicated radiator different from the radiator of the engine cooling system and the PCU by a dedicated electric pump. Thus, in the hybrid vehicle, an electric pump and a radiator are required for the engine cooling system and the PCU cooling system, respectively, and the cooling device is complicated. Therefore, a technique for simplifying the cooling device in the hybrid vehicle is desired. As a technique for simplifying the cooling device in such a hybrid vehicle, there is a technique disclosed in the following publications.

  Japanese Patent Laying-Open No. 2002-276364 (Patent Document 1) discloses a technology that makes a cooling device simple and inexpensive by integrating cooling devices of an internal combustion engine and an electric motor. The cooling device for a hybrid electric vehicle disclosed in this publication includes an internal combustion engine and an electric motor as a power device, a first radiator that cools cooling water that circulates through the internal combustion engine, and a second that cools cooling water that circulates through the electric motor. It is used for a hybrid electric vehicle having a radiator. This cooling device branches and merges so as to be parallel to the internal combustion engine cooling water passage in which the cooling water circulates between the internal combustion engine and the first radiator, and the downstream water passage that is the downstream side of the first radiator, A motor cooling water channel in which the second radiator and the motor are disposed, a flow rate adjusting valve that is provided at a branch portion of the downstream water channel, and that adjusts a flow rate distribution of the cooling water flowing through the downstream water channel and the motor cooling water channel; An electric pump that circulates the cooling water through the engine cooling water channel, and a control unit that controls the operation of the flow rate adjusting valve and the electric pump. The control means controls the valve opening degree of the flow rate adjusting valve and the discharge flow rate of the electric pump according to the load states of the internal combustion engine and the electric motor.

According to the cooling device for a hybrid electric vehicle disclosed in this publication, the motor cooling water channel that branches from the internal combustion engine cooling water channel by providing a flow rate adjusting valve, as a cooling device for the internal combustion engine and the motor, without being provided independently of each other. Can be formed. Moreover, the cooling water of both cooling water channels can be circulated with one electric pump. Therefore, a simple and inexpensive cooling device can be realized. Moreover, the amount of cooling water required for each radiator can be circulated by adjusting the flow distribution to the downstream water channel and the motor cooling water channel using the flow rate adjusting valve or by changing the discharge flow rate using the electric pump. Thereby, cooling according to the load state of an internal combustion engine and an electric motor is attained.
JP 2002-276364 A

  However, in the cooling device for a hybrid electric vehicle disclosed in Patent Document 1, the cooling water of the internal combustion engine cooling system and the motor cooling system can be circulated by one electric pump, but the cooling that circulates both cooling systems is possible. Water joins with the flow control valve. Therefore, for example, even when the cooling target temperature of the electric motor is different from the cooling target temperature of the internal combustion engine, there is a problem that it is difficult to maintain the temperature of each cooling water at a temperature corresponding to each target temperature.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cooling device capable of maintaining the refrigerant temperature at a value corresponding to the cooling target temperature in the cooling target while simplifying. Is to provide.

  The cooling device according to the first invention cools the first heating element and the second heating element. The cooling device includes: a first circulation path through which a first refrigerant that cools the first heating element circulates; a pump mechanism that is provided in the first circulation path and circulates the first refrigerant; A second circulation path configured independently of the circulation path, through which the second refrigerant that cools the second heating element circulates, and circulation of the first refrigerant generated by the pump mechanism, Circulation means for circulating the refrigerant.

  According to the first invention, the first circulation path through which the first refrigerant for cooling the first heating element circulates, and the second circulation path through which the second refrigerant for cooling the second heating element circulates. Are configured independently. Therefore, the temperature of the first refrigerant and the temperature of the second refrigerant can be maintained at temperatures corresponding to the cooling target temperatures of the respective heating elements. Further, the second refrigerant circulates in the second circulation path by utilizing the circulation of the first refrigerant generated by the pump mechanism provided in the first circulation path. For example, a part of the fluid energy of the first refrigerant is applied to the second refrigerant by the circulation means, and the second refrigerant circulates in the second circulation path. Therefore, the second refrigerant can be circulated only by providing one pump mechanism in the first circulation path. Thereby, it is suppressed to newly provide a pump in the second circulation path. As a result, it is possible to provide a cooling device capable of maintaining the refrigerant temperature at a value corresponding to the cooling target temperature in the object to be cooled while simplifying.

  In the cooling device according to the second invention, in addition to the configuration of the first invention, the circulating means gives a part of fluid energy of the first refrigerant as fluid energy to the second refrigerant, thereby Means for circulating the two refrigerants.

  According to the second invention, part of the fluid energy of the first refrigerant is imparted to the second refrigerant as fluid energy. Therefore, by operating the pump mechanism and applying fluid energy to the first refrigerant, it is possible to circulate the first refrigerant in the first circulation path and the second refrigerant in the second circulation path, respectively. it can.

  In the cooling device according to the third invention, in addition to the configuration of the first invention, the circulation means is provided in the first circulation path, and converts a part of the fluid energy of the first refrigerant into rotational energy. Conversion means, one end connected to the conversion means, a transmission means for transmitting rotational energy to the other end, and a second circulation path connected to the other end, the transmitted rotational energy being transferred to the second Applying means for applying the refrigerant as fluid energy.

  According to the third invention, part of the fluid energy of the first refrigerant is converted into rotational energy by the conversion means provided in the first circulation path. The converted rotational energy is transmitted by the transmission means to the applying means provided in the second circulation path. The transmitted rotational energy is applied as fluid energy to the second refrigerant by the applying means. Therefore, by operating the pump mechanism and applying fluid energy to the first refrigerant, it is possible to circulate the first refrigerant in the first circulation path and the second refrigerant in the second circulation path, respectively. it can.

  A cooling device according to a fourth aspect of the invention includes, in addition to the configuration of any of the first to third aspects of the invention, a first cooler that is provided in the first circulation path and cools the first refrigerant, And a second cooler that is provided in the second circulation path and cools the second refrigerant.

  According to the fourth invention, the first refrigerant and the second refrigerant can be cooled by different coolers. Therefore, by setting each cooler to the cooling performance corresponding to the cooling target temperature of each heating element, the temperature of the first refrigerant and the temperature of the second refrigerant are set to temperatures corresponding to each target temperature. Can do.

  In the cooling device according to the fifth invention, in addition to the configuration of any one of the first to fourth inventions, the first heating element is an internal combustion engine mounted on a vehicle. The second heating element is an electronic element mounted on the vehicle.

  According to the fifth invention, when the internal combustion engine and the electronic element having different cooling target temperatures are cooled, the refrigerant having a temperature corresponding to the cooling target temperature of the internal combustion engine and the refrigerant having a temperature corresponding to the cooling target temperature of the electronic element. Can be circulated by a single pump mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated. In the following, a mode in which the cooling device according to the present embodiment is applied to a hybrid vehicle will be described, but the cooling device according to the present invention is not limited to being applied to a hybrid vehicle.

<First Embodiment>
A cooling device 10 according to the present embodiment will be described with reference to FIG. In the following description, the upper side of the paper surface of FIG. 1 is described as the actual upper side, and the lower side of the paper surface of FIG. 1 is described as the actual lower side. The direction is not limited to this.

  Cooling device 10 cools engine 100 and PCU 200 mounted on the hybrid vehicle. The cooling device 10 includes a circulation path 110, an electric pump 120, a main radiator 130, a circulation path 210, a sub radiator 220, and a circulation mechanism 300.

  The engine 100 is one of the drive sources of the hybrid vehicle, and generates heat when driven. Engine 100 is provided with a cooling water passage (not shown), and LLC flowing through this cooling water passage cools engine 100.

  Circulation path 110 is a path through which LLC circulates between engine 100 and main radiator 130. The circulation path 110 includes circulation paths 110A and 110B. The LLC that has absorbed the heat of the engine 100 flows through the circulation path 100A and enters the main radiator 130. The LLC cooled by the main radiator 130 flows through the circulation path 110B, returns to the engine 100 again, and cools the engine 100.

  The electric pump 120 is driven by a motor (not shown) that is another driving source of the engine 100 and the hybrid vehicle, and circulates LLC to the circulation path 110.

  The main radiator 130 is a so-called cross flow type radiator. The main radiator 130 includes a thermostat 132, a first side tank 134, a tube 136, a radiation fin 138, and a second side tank 140.

  The thermostat 132 is a valve that opens and closes depending on the temperature, and is connected to the upper side surface of the first side tank 134. Until the temperature of the LLC reaches a predetermined set temperature, the valve is closed so that the LLC flows into the bypass passage 142 provided in the upper portion of the main radiator 130 (see the dotted arrow). When the temperature of the LLC reaches a predetermined set temperature, the valve is opened so that the LLC flows through the first side tank 134, the tube 136, and the second side tank 140.

  The first side tank 134 is a tank that causes LLC that has entered from the thermostat 132 to flow through the tube 136.

  The tubes 136 are thin pipes provided in the main body portion of the main radiator 130, and the upstream side is connected to the first side tank 134. Thin plate-shaped heat radiation fins 138 are provided outside the tube 136.

  The second side tank 140 is connected to the downstream side of the bypass passage 142 and the tube 136. The LLC that has flowed from the bypass passage 142 and the tube 136 flows through the second side tank 140 in the order of the circulation mechanism 300, the circulation path 110 </ b> B, and the engine 100.

  The bypass passage 142 is connected to the thermostat 132 on the upstream side and to the second side tank 140 on the downstream side. The LLC flowing through the bypass passage 142 bypasses the main radiator 130 and flows to the second side tank 140.

  The temperature of the LLC of the circulation path 110 becomes a temperature (for example, 100 ° C.) according to the cooling target temperature of the engine 100 by appropriately setting the LLC flow rate of the circulation path 110 and the cooling capacity of the main radiator 130. To be controlled.

  The PCU 200 is a unit that converts a direct current from a driving battery (not shown) into an alternating current and supplies the alternating current to the motor. The PCU 200 generates heat when converting a direct current into an alternating current. The PCU 200 is provided with a cooling water passage (not shown), and the LLC flowing through the cooling water passage cools the PCU 200.

  The circulation path 210 is a path through which the LLC circulates between the PCU 200 and the sub radiator 220. The circulation path 210 includes circulation paths 210 </ b> A and 210 </ b> B, and is configured independently of the circulation path 110. The LLC that has absorbed the heat of the PCU 200 flows through the circulation path 210 </ b> A and enters the sub-radiator 220. The LLC cooled by the sub-radiator 220 flows through the circulation path 210B, returns to the PCU 200 again, and cools the PCU 200.

  The sub-radiator 220 is a so-called cross flow type radiator connected to the upper portion of the bypass passage 142. The sub radiator 220 includes a first side tank 222, tubes 224, heat radiation fins 226, and a second side tank 228.

  The first side tank 222 is connected to the circulation path 210 </ b> A, and is a tank that allows LLC that has entered from the circulation path 210 </ b> A to flow through the tube 224.

  The tubes 224 are a plurality of thin pipes provided in the main body portion of the sub radiator 220, and the upstream side is connected to the first side tank 222. Thin plate-like heat radiation fins 226 are provided outside the tube 224.

  The second side tank 228 is connected to the downstream side of the tube 224. The LLC flowing from the tube 224 flows in the order of the circulation mechanism 300, the circulation path 210B, and the PCU 200 via the second side tank 228.

  The LLC temperature of the circulation path 210 is set to a temperature (for example, 70 ° C.) corresponding to the cooling target temperature of the PCU 200 by appropriately setting the LLC flow rate of the circulation path 210 and the cooling capacity of the sub-radiator 220. Controlled. That is, the LLC temperature of the circulation path 210 is controlled to be lower than the LLC temperature of the circulation path 110.

  The circulation mechanism 300 includes a case 302, a blocking wall 304, a first impeller 310, a rotating shaft 320, and a second impeller 330. The interior of the case 302 is divided by the blocking wall 304 to form the first flow path 306 and the second flow path 308.

  The first flow path 306 has an upstream side connected to the upper side surface of the second side tank 140 and a downstream side connected to the circulation path 110B. Inside the first flow path 306, the first impeller 310 is connected to and supported by one end of the rotating shaft 320.

  The first impeller 310 is rotated by part of the fluid energy of the LLC flowing from the second side tank 140. The rotating shaft 320 connected to the first impeller 310 also rotates in conjunction with it.

  The second flow path 308 has an upstream side connected to the lower side surface of the second side tank 228 and a downstream side connected to the circulation path 210B. Inside the second flow path 308, the second impeller 330 is connected to and supported by one end of the rotating shaft 320 on the side different from the side to which the first impeller 310 is connected.

  The second impeller 330 rotates as the rotating shaft 320 rotates, and applies its own rotational energy as fluid energy to the LLC in the second flow path 308 to circulate the LLC.

  The rotating shaft 320 passes through the blocking wall 304, and one end is connected to the rotation center of the first impeller 310 and the other end is connected to the rotation center of the second impeller 330.

  The operation of the cooling device 10 according to the present embodiment based on the above structure will be described.

  When the driving operation of the hybrid vehicle is started by the driver, the engine 100 and the PCU 200 start to generate heat, and the LLC starts to circulate through the circulation path 110 by the operation of the electric pump 120. The LLC that has absorbed the heat of the engine 100 flows into the thermostat 132 from the circulation path 110A.

  Until the temperature of the LLC reaches a predetermined set temperature, the valve of the thermostat 132 is closed, and the LLC bypasses the main radiator 130 and flows into the bypass passage 142. The LLC that has flowed into the second side tank 140 from the bypass passage 142 flows to the circulation path 110B via the first flow path 306 and returns to the engine 100 again. Thereby, LLC is circulated without being cooled, and engine 100 is quickly warmed up.

  On the other hand, when the temperature of the LLC reaches a predetermined set temperature, the valve of the thermostat 132 is opened, and the LLC flows into the first side tank 134 and the tube 136 and radiates heat through the radiation fins 138. The LLC that has flowed into the second side tank 140 from the tube 136 flows into the circulation path 110B via the first flow path 306 and returns to the engine 100 again. Thereby, engine 100 can be cooled by LLC controlled to a temperature corresponding to the cooling target temperature of engine 100.

  When the LLC flows through the first flow path 306, a part of the fluid energy of the LLC is transmitted to the first impeller 310, and the first impeller 310 rotates. Thereby, the 2nd impeller 320 connected with the rotating shaft 320 rotates in conjunction. When the 2nd impeller 320 rotates, fluid energy is provided to LLC in the 2nd flow path 308, and LLC flows out into the circulation path 210B. The LLC that has flowed into the PCU 200 from the circulation path 210 </ b> B and absorbed the heat of the PCU 200 flows into the circulation path 210 </ b> A, the first side tank 222, and the tubes 224 and radiates heat through the radiation fins 226. The LLC that has flowed into the second side tank 228 from the tube 224 flows into the second flow path 308 and is again given fluid energy by the second impeller 320 and circulates in the circulation path 210. Since the circulation path 210 is configured independently of the circulation path 110, the LLC of the circulation path 210 is not affected by the LLC of the high-temperature circulation path 110 and is maintained at a temperature corresponding to the cooling target temperature of the PCU 200. Is done. Furthermore, the LLC of the circulation path 210 circulates by operating the electric pump 120 provided in the circulation path 110. Therefore, it is suppressed to newly provide an electric pump in the circulation path 210.

  As described above, according to the cooling device according to the present embodiment, the circulation path through which the engine cooling LLC circulates and the circulation path through which the PCU cooling LLC circulates are configured independently. Therefore, the temperature of the LLC for cooling the engine and the temperature of the LLC for cooling the PCU can be maintained at temperatures corresponding to the respective cooling target temperatures of the engine and the PCU. Furthermore, LLC for PCU cooling circulates by the electric pump provided in the circulation path of LLC for engine cooling. Therefore, it is suppressed to newly provide an electric pump in the circulation path for cooling the PCU.

  In the cooling device according to the present embodiment, the electric pump is provided only in the engine cooling LLC circulation path, and the configuration in which the PCU cooling LLC is circulated by the electric pump has been described. The circulation path provided is not limited to this. That is, an electric pump may be provided only in the circulation path through which the PCU cooling LLC circulates, and the engine cooling LLC may be circulated by the electric pump.

<Second Embodiment>
With reference to FIG. 2, the cooling device 20 according to the present embodiment will be described. Compared with the configuration of the cooling device 10 according to the first embodiment described above, the cooling device 20 according to the present embodiment replaces the circulation channels 110 and 210 with the circulation channels 1110 and 1210, the switching valve 2100, 2200, 2300, 2400, and bypass passages 2500, 2600 are different. The other configuration is the same as the configuration of the cooling device 10 according to the first embodiment described above. The same reference numerals are assigned to the same components. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  The circulation path 1110 includes circulation paths 1110A, 1110B, 1110C, and 1110D. The circulation path 1110 </ b> A is connected to the engine 100 on the upstream side, and connected to the circulation path 1110 </ b> B via the switching valve 2100 on the downstream side. The downstream side of the circulation path 1110B is connected to the thermostat 132. The circulation path 1110C is connected to the first flow path 306 on the upstream side, and is connected to the circulation path 1110D on the downstream side with a switching valve 2400. The downstream side of the circulation path 1110D is connected to the engine 100.

  The circulation path 1210 includes circulation paths 1210A, 1210B, 1210C, and 1210D. The upstream side of the circulation path 1210A is connected to the PCU 200, and the downstream side is connected to the circulation path 1210B by the switching valve 2300. The downstream side of the circulation path 1210B is connected to the first side tank 222. The upstream side of the circulation path 1210C is connected to the second flow path 308, and the downstream side is connected to the circulation path 1210D by the switching valve 2200. The downstream side of the circulation path 1210D is connected to the PCU 200.

  The switching valves 2100, 2200, 2300, and 2400 are controlled by a control unit (not shown) according to the temperature of the engine 100 detected by a temperature sensor (not shown).

  When the temperature of engine 100 is lower than a predetermined temperature, switching valve 2100 communicates with circulation path 1110A and bypass passage 2500 and is controlled to block circulation path 1110B. The switching valve 2100 is controlled to connect the circulation path 1110A and the circulation path 1110B and to block the bypass passage 2500 when the temperature of the engine 100 becomes higher than a predetermined temperature.

  When the temperature of engine 100 is lower than a predetermined temperature, switching valve 2200 communicates with bypass passage 2500 and circulation path 1210D and is controlled to block circulation path 1210C. When the temperature of engine 100 becomes higher than a predetermined temperature, switching valve 2200 communicates with circulation path 1210C and circulation path 1210D, and is controlled to block bypass passage 2500.

  When the temperature of engine 100 is lower than a predetermined temperature, switching valve 2300 communicates with circulation path 1210A and bypass passage 2600 and is controlled to block circulation path 1210B. When the temperature of engine 100 becomes higher than a predetermined temperature, switching valve 2300 communicates with circulation path 1210A and circulation path 1210B and is controlled to block bypass passage 2600.

  When the temperature of engine 100 is lower than a predetermined temperature, switching valve 2400 is controlled to communicate bypass path 2600 and circulation path 1110D and to block circulation path 1110C. When the temperature of engine 100 becomes higher than a predetermined temperature, switching valve 2400 is controlled to connect circulation path 1110C and circulation path 1110D and to shut off bypass passage 2600.

  The operation of the cooling device 20 according to the present embodiment based on the above structure will be described.

  When the driving operation of the hybrid vehicle is started by the driver, the engine 100 and the PCU 200 start to generate heat, and the LLC starts to circulate by the operation of the electric pump 120.

  When the temperature of engine 100 is lower than a predetermined temperature, switching valve 2100 causes circulation path 1110A to communicate with bypass passage 2500, and circulation path 1110B is blocked. By the switching valve 2200, the bypass passage 2500 and the circulation path 1210D are communicated, and the circulation path 1210C is blocked. The switching valve 2300 allows the circulation path 1210A to communicate with the bypass path 2600, and the circulation path 1210B is blocked. By the switching valve 2400, the bypass passage 2600 communicates with the circulation path 1110D, and the circulation path 1110C is shut off. Thereby, as indicated by the arrow in FIG. 2, the LLC that has absorbed the heat of the engine 100 flows into the PCU 200 via the circulation path 1110A, the bypass passage 2500, and the circulation path 1210D. The LLC that has absorbed the heat of the PCU 200 flows into the engine 100 via the circulation path 1210A, the bypass path 2600, and the circulation path 1110D. Therefore, engine 100 is quickly warmed up by LLC that has absorbed the heat of PCU 200.

  On the other hand, when the temperature of engine 100 becomes higher than a predetermined temperature, switching valve 2100 connects circulation path 1110A and circulation path 1110B, and bypass passage 2500 is shut off. The switching valve 2200 allows the circulation path 1210C and the circulation path 1210D to communicate with each other and the bypass passage 2500 is blocked. By the switching valve 2300, the circulation path 1210A and the circulation path 1210B are communicated, and the bypass passage 2600 is blocked. The switching valve 2400 allows the circulation path 1110C and the circulation path 1110D to communicate with each other and the bypass passage 2600 is blocked. Thereby, like the cooling device 10 according to the first embodiment described above, the LLC circulation path 1100 for cooling the engine 100 and the LLC circulation path 1210 for cooling the PCU 200 are configured independently. . Therefore, the LLC of the circulation path 1210 is not affected by the LLC of the high-temperature circulation path 1110 and is maintained at a temperature corresponding to the cooling target temperature of the PCU 200. Furthermore, by operating the electric pump 120 provided in the circulation path 1110, the LLC of the circulation path 1210 circulates. Therefore, it is suppressed to newly provide an electric pump in the circulation path 1210.

  As described above, according to the cooling device according to the present embodiment, when the engine temperature is lower than a predetermined temperature, the circulation path through which the engine cooling LLC circulates and the PCU cooling LLC circulates. The circulation path is connected by a bypass passage. The operation of the electric pump causes the LLC to circulate between the PCU and the engine without passing through the radiator. Therefore, the engine can be quickly warmed up by the LLC that has absorbed the heat of the PCU. When the temperature of the engine becomes higher than a predetermined temperature, a circulation path through which the engine cooling LLC circulates and a circulation path through which the PCU cooling LLC circulates are configured independently. Therefore, the temperature of the LLC for cooling the engine and the temperature of the LLC for cooling the PCU can be maintained at temperatures corresponding to the respective cooling target temperatures of the engine and the PCU. Furthermore, LLC for PCU cooling circulates by the electric pump provided in the circulation path of LLC for engine cooling. For this reason, it is possible to suppress the provision of a new pump in the PCU cooling circuit.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram of the cooling device which concerns on the 1st Embodiment of this invention. It is a schematic diagram of the cooling device which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

  10, 20 Cooling device, 100 Engine, 110, 110A, 110B, 210, 210A, 210B, 1110, 1110A, 1110B, 1110C, 1110D, 1210, 1210A, 1210B, 1210C, 1210D Circulation path, 120 Electric pump, 130 Main radiator , 132 Thermostat, 134, 222 First side tank, 136, 224 tube, 138, 226 Radiation fin, 140, 228 Second side tank, 142 Bypass passage, 200 PCU, 220 Sub radiator, 300 Circulation mechanism, 302 Case, 304 Blocking wall, 306 first flow path, 308 second flow path, 310 first impeller, 320 rotating shaft, 330 second impeller, 2100, 2200, 2300, 2400 switching valve, 2500, 260 Bypass passage.

Claims (2)

A cooling device for cooling the first heating element and the second heating element,
A first circulation path through which a first refrigerant for cooling the first heating element circulates;
A pump mechanism provided in the first circulation path for circulating the first refrigerant;
A first radiator that forms a part of the first circulation path and that has a refrigerant outlet at an upper side surface;
A second circulation path configured independently of the first circulation path, through which a second refrigerant for cooling the second heating element circulates;
A second radiator that forms a part of the second circulation path and that has a refrigerant outlet at a lower portion of the side surface;
Circulating means for circulating the second refrigerant using circulation of the first refrigerant generated by the pump mechanism ,
The second radiator is disposed at an upper portion of the first radiator so that a refrigerant outlet of the first radiator and a refrigerant outlet of the second radiator are close to each other.
The circulating means is
Conversion means provided near the refrigerant outlet of the first radiator in the first circulation path for converting a part of fluid energy of the first refrigerant into rotational energy;
One end connected to the conversion means, and a transmission means for transmitting the rotational energy to the other end;
An applying means provided near the refrigerant outlet of the second radiator in the second circulation path and for applying rotational energy transmitted to the other end of the transmitting means as fluid energy to the second refrigerant; Including cooling system. The first heating element is an internal combustion engine mounted on a vehicle;
The cooling device according to claim 1, wherein the second heating element is an electronic element mounted on the vehicle.

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