JP5730722B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger used in a hybrid vehicle that travels with at least one of an engine and a motor.

  Conventionally, a radiator for cooling engine cooling water is disclosed in Japanese Patent Application Laid-Open No. 2006-118803 (Patent Document 1) in which air is vented by forming a communication passage upward from the uppermost portion of the radiator tank. Is disclosed.

JP 2006-118803 A

  In recent years, a structure in which an oil cooler is integrated in a radiator tank has been adopted in a vehicle in order to reduce costs. In a hybrid vehicle using both an engine and a motor, both driving using both the engine and motor as a driving source and driving using only the motor as a driving source are performed. Stopped. Since the temperature of the engine cooling water does not rise while the engine is stopped, the circulation of the cooling water to the radiator for cooling the engine cooling water is stopped. Therefore, there is a problem that the heat dissipation performance of the oil cooler built in the radiator tank is reduced.

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide a heat exchanger that can ensure the heat dissipation performance of the oil cooler while the engine of the hybrid vehicle is stopped.

  A heat exchanger according to the present invention is a heat exchanger used in a hybrid vehicle that travels with at least one of the power of an engine and a motor, and includes a radiator for cooling engine coolant, and cooling that flows through the radiator. A tank for storing water and an oil cooler for cooling the cooling oil of the motor are provided. The oil cooler is disposed inside the tank, and the cooling oil is cooled by exchanging heat between the cooling oil flowing in the oil cooler and the cooling water stored in the tank. The tank is connected to a path through which cooling water flows out of the tank from a position above the oil cooler. The heat exchanger further includes a thermostat that adjusts the flow rate of cooling water flowing from the radiator to the engine. The cooling oil is also cooled when the thermostat is closed.

  According to the heat exchanger of the present invention, the heat dissipation performance of the oil cooler built in the engine radiator tank can be improved.

It is a schematic diagram which shows the outline of a structure of the heat exchanger of a comparative example. It is an enlarged view which shows the detail of the upper end vicinity of the radiator tank shown in FIG. 2 is a schematic diagram illustrating an outline of a configuration of a heat exchanger according to Embodiment 1. FIG. 6 is a schematic diagram illustrating an outline of a configuration of a heat exchanger according to Embodiment 2. FIG. FIG. 6 is a schematic diagram illustrating an outline of a configuration of a heat exchanger according to a third embodiment. FIG. 6 is a schematic diagram illustrating an outline of a configuration of a heat exchanger according to a fourth embodiment. FIG. 6 is a schematic diagram illustrating an outline of a configuration of a heat exchanger according to a fifth embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  FIG. 1 is a schematic diagram showing an outline of a configuration of a heat exchanger of a comparative example. First, with reference to FIG. 1, the structure of the conventional heat exchanger provided with the radiator tank 23 which incorporated the oil cooler 60 in a hybrid vehicle is demonstrated. The hybrid vehicle includes an engine 10 as a first drive source and an EV (Electric Vehicle) motor 50 as a second drive source, and travels with at least one of the power of the engine 10 and the EV motor 50. .

  The engine 10 is provided with a water pump 11 for circulating cooling water for cooling the engine 10. The water pump 11 gives energy to the cooling water, and transfers the cooling water so as to circulate and flow through a system including the engine 10 and the engine radiator 20. The cooling water is heated by transferring heat from the engine 10. The heated cooling water flows to the engine radiator 20. The cooling water is cooled by exchanging heat with the air flow in the engine radiator 20. As a result, excess heat generated in the engine 10 is dissipated in the engine radiator 20 and the engine 10 is cooled.

  The engine radiator 20 includes a radiator core. The radiator core cools the cooling water by exchanging heat between the cooling water heated by the engine 10 and the air by using the running wind generated by the hybrid vehicle as it travels or the air cooling by forced ventilation by the fan. To do. Resin-made radiator tanks 21 and 23 are disposed on both the left and right sides of the radiator core. The engine radiator 20 is a so-called cross flow type radiator in which radiator tanks 21 and 23 are disposed on both the left and right sides of the radiator core.

  The radiator tank 21 is provided with an inlet port 22 that serves as an inlet for cooling water to the radiator tank 21. The radiator tank 23 is provided with an outlet port 24 serving as an outlet for cooling water from the radiator tank 23. The radiator tanks 21 and 23 store cooling water flowing through the engine radiator 20.

  The cooling water supplied from the water pump 11 to the inside of the engine 10 flows out of the engine 10 through the pipe 16 as shown by the arrow in FIG. Thereafter, the cooling water flows from the inlet port 22 into the radiator tank 21 via the pipe 26. The cooling water flows from the radiator tank 21 toward the radiator tank 23 in the right direction in FIG. 1 through the radiator core. At this time, the cooling water is cooled by exchanging heat with air. The cooling water that has reached the radiator tank 23 flows from the outlet port 24 through the pipes 27 and 28, the thermostat 74, and the pipes 79 and 18 in this order, and then flows again to the water pump 11.

  A thermostat 74 is provided in the path of the refrigerant flowing between the engine 10 and the engine radiator 20. The thermostat 74 has a valve body that can be opened and closed. When the opening degree of the valve body increases, the flow rate of the cooling water flowing into the engine radiator 20 increases. When the opening degree of the valve body decreases, the flow rate of the cooling water flowing into the engine radiator 20 decreases. The valve body senses the temperature of the cooling water flowing into the engine 10 and opens and closes to adjust the flow rate of the cooling water that is cooled by the heat exchange by the engine radiator 20. The engine 10 is optimally cooled by adjusting the flow rate of the cooling water.

  When the engine 10 is warmed up, the valve body of the thermostat 74 is fully closed (valve opening degree 0%), so that the cooling water does not flow to the engine radiator 20. At this time, the cooling water supplied from the water pump 11 to the inside of the engine 10 flows in order through the pipes 16, 17 and 18 shown in FIG. 1 and then flows again to the water pump 11. Thereby, the cooling water heated by the engine 10 circulates as it is to the engine 10, so that the temperature of the engine 10 rises early.

  The cooling water is also supplied from the engine 10 to auxiliary equipment of the engine 10 such as the heater 81 and the exhaust gas recirculation device 82. The cooling water supplied from the water pump 11 to the inside of the engine 10 branches from the pipe 84 shown in FIG. The cooling water flows from the pipe 85 through the heater 81 and flows to the pipe 87, and from the pipe 86 flows through the exhaust gas recirculation device 82 to the pipe 88. Thereafter, the cooling water merges again in the pipe 89 and flows again to the water pump 11 via the pipe 18.

  Also shown in FIG. 1 is a sealed reserve tank 70 for the engine 10. The hermetic reserve tank 70 is provided with a pressure cap 71. The pressure cap 71 includes a valve body that suppresses the opening of an overflow pipe (not shown) until the inside of the sealed reserve tank 70 reaches a preset pressure.

  The sealed reserve tank 70 is connected to the engine 10 via a pipe 76, is connected to the radiator tank 21 via a pipe 77, and is further connected to a pipe 27 between the outlet port 24 and the thermostat 74 via a pipe 78. , 28. Cooling water mixed with air is collected from the engine 10 via the pipe 76 to the sealed reserve tank 70 or from the radiator tank 21 via the pipe 77 to the sealed reserve tank 70. Cooling water that has been gas-liquid separated in the closed type reserve tank 70 flows out of the closed type reserve tank 70 via the pipe 78, and again passes through the pipe 28, the thermostat 74, and the pipes 79, 18 in this order to the water pump again. 11 flows.

  As a system different from the engine 10 cooling system described above, an inverter cooling system is provided. An inverter cooler 94 that performs heat exchange between the inverter and the cooling water to cool the inverter is connected to the inverter radiator 30. The cooling water flowing through the inverter cooler 94 is transferred by the water pump 92. The cooling water heated in the inverter cooler 94 is cooled by exchanging heat with the air flow in the inverter radiator 30. As a result, the heat generated in the inverter is dissipated in the inverter radiator 30 to cool the inverter.

  The inverter radiator 30 is connected to the above-described engine radiator 20 via the connecting portion 40. The engine radiator 20 and the inverter radiator 30 are provided in an integral structure. Similarly to the engine radiator 20, the inverter radiator 30 includes a radiator core and cools the cooling water in the radiator core. Resin-made radiator tanks 31 and 33 are disposed on both the left and right sides of the radiator core. The inverter radiator 30 is a so-called cross-flow type radiator in which radiator tanks 31 and 33 are arranged on both the left and right sides of the radiator core.

  The radiator tank 31 is provided with an inlet port 32 that serves as an inlet for cooling water to the radiator tank 31. The radiator tank 33 is provided with an outlet port 34 that serves as an outlet for cooling water from the radiator tank 33.

  A closed type reserve tank 90 is connected to the cooling system of the inverter. The hermetic reserve tank 90 is provided with a pressure cap 91. The pressure cap 91 includes a valve body that suppresses the opening of an overflow pipe (not shown) until the inside of the closed type reserve tank 90 reaches a preset pressure. The cooling water mixed with air is gas-liquid separated inside the closed type reserve tank 90, and the cooling water flows out of the closed type reserve tank 90.

  The cooling water heated and transferred from the inverter in the inverter cooler 94 is collected in the hermetic reserve tank 90 via the pipe 96. Cooling water that has been gas-liquid separated in the sealed reserve tank 90 flows out of the sealed reserve tank 90 via the pipe 97 and flows to the water pump 92. By the water pump 92, the cooling water flows into the radiator tank 31 from the inlet port 32 via the pipe 36. The cooling water flows from the radiator tank 31 toward the radiator tank 33 in the right direction in FIG. 1 through the radiator core. At this time, the cooling water is cooled by exchanging heat with air. Cooling water cooled by the inverter radiator 30 and reaching the radiator tank 33 is supplied again from the outlet port 34 to the inverter cooler 94 via the pipe 37 and used for cooling the inverter.

  A cooling system for the EV motor 50 is provided as yet another system different from the cooling system for the engine 10 and the inverter. Cooling oil for cooling the EV motor 50 is transferred by the oil pump 51. The cooling oil heated in the EV motor 50 is cooled in the oil cooler 60. The heat generated by the EV motor 50 is transmitted to the oil cooler 60 using the cooling oil as a refrigerant, and the heat is dissipated in the oil cooler 60. Thereby, the EV motor 50 is cooled.

  The cooling oil heated by heat transfer from the EV motor 50 flows to the oil pump 51 via the pipe 56. The cooling oil flows into the oil cooler 60 via the pipe 57 by the oil pump 51. The cooling oil cooled by the oil cooler 60 flows again to the EV motor 50 via the pipe 58 and is used for cooling the EV motor 50.

  The oil cooler 60 is disposed inside one of the pair of radiator tanks 21 and 23 disposed on the left and right sides of the engine radiator 20 and connected to the downstream side of the cooling water flow. . The cooling oil heated by the EV motor 50 flows into the oil cooler 60 and is cooled by exchanging heat with the surrounding cooling water in the oil cooler 60. An oil cooler 60 is disposed inside the radiator tank 23 that stores the cooling water after being cooled by the radiator core. As a result, the temperature difference between the cooling oil flowing into the oil cooler 60 and the cooling water around the oil cooler 60 becomes large, so that the cooling oil can be cooled more efficiently.

  When the hybrid vehicle runs using both the engine 10 and the EV motor 50 as power sources, both the water pump 11 and the oil pump 51 described above operate. At this time, the cooling oil flows to the oil cooler 60, and the cooling water in the radiator tank 23 flows toward the engine 10 by the water pump 11. Therefore, since the cooling water cooled by the engine radiator 20 is always supplied around the oil cooler 60, heat can be released from the cooling oil heated by the EV motor 50 to the surrounding cooling water. Oil can be cooled efficiently.

  On the other hand, in the case of motor travel in which the engine 10 is stopped and the hybrid vehicle is traveled using only the EV motor 50 as a power source, the water pump 11 is stopped and the thermostat 74 is closed. Since the supply of the cooling water to the radiator tank 23 is stopped, the temperature of the cooling water in the radiator tank 23 increases due to heat transfer from the high-temperature cooling oil flowing in the oil cooler 60 to the cooling water in the radiator tank 23. Will occur.

  FIG. 2 is an enlarged view showing details in the vicinity of the upper end of the radiator tank 23 shown in FIG. As shown in FIG. 2, the engine radiator 20 includes a plurality of tubes 20a through which cooling water flows and a plurality of fins 20b disposed around the tubes 20a. Heat is transferred from the cooling water flowing in the tube 20a to the fins 20b, and the heat is dissipated into the air as the air flows through the fins 20b. Thus, the radiator 20 for engines has a structure which can cool the cooling water which distribute | circulates the tube 20a.

  The tube 20 a communicates with the internal space of the radiator tank 23. During operation of the water pump 11, cooling water cooled by the engine radiator 20 and having a lowered temperature is supplied from the tube 20 a into the radiator tank 23 and flows around the oil cooler 60.

  On the other hand, while the water pump 11 is stopped, the cooling water stays around the oil cooler 60. Since the cooling water in the tube 20a has a low temperature and a high specific gravity, the outflow of the cooling water having a small specific gravity heated by the cooling oil in the oil cooler 60 from the radiator tank 23 to the tube 20a is suppressed. Therefore, the exchange phenomenon by the natural convection of the high temperature water in the oil cooler 60 and the low temperature water in the tube 20a is impaired. In addition, the heat capacity of the cooling water in the radiator tank 23 is small.

  As a result, after heat is transferred from the cooling oil flowing to the oil cooler 60 to the cooling water around the oil cooler 60, the high-temperature cooling water may locally stay in the radiator tank 23. In particular, since the specific gravity of the high-temperature cooling water becomes relatively small, the high-temperature water tends to stay near the upper portion 23a in the radiator tank 23.

  If the high-temperature cooling water stays in the radiator tank 23, the durability of the engine radiator 20 deteriorates. For example, the resin forming the radiator tank 23 is deteriorated in the durability life of a rubber seal member used for the radiator tank 23, which causes thermal stress in the engine radiator 20 to cause thermal distortion and damages the tube 20a. It may have an adverse effect on the durable life of the material. Therefore, retention of high-temperature water is not preferable in terms of durability of the engine radiator 20. When the temperature of the cooling water around the oil cooler 60 is high, the temperature difference between the cooling oil flowing through the oil cooler 60 and the cooling water around the oil cooler 60 becomes small, and the heat dissipation performance from the oil cooler 60 to the cooling water. Will decrease.

  The heat exchanger according to the embodiment described below intends to solve such a problem.

(Embodiment 1)
FIG. 3 is a schematic diagram illustrating an outline of the configuration of the heat exchanger according to the first embodiment. Compared with FIG. 1 and FIG. 3, in the heat exchanger according to the first embodiment, the radiator tank 23 is connected to a heat release path 110 for releasing heat from the radiator tank 23. The heat release path 110 is disposed outside the radiator tank 23. An inlet 111 serving as an inlet through which cooling water flows into the heat release path 110 is connected to the uppermost portion of the radiator tank 23. An outlet 112 serving as an outlet from which the cooling water flows out from the heat release path 110 is connected to the lower part of the center of the radiator tank 23.

  The inlet 111 is provided at a position above the oil cooler 60. The outlet 112 is provided at a position below the oil cooler 60. The cooling water flows out of the radiator tank 23 from the inlet 111, flows through the heat release path 110, and flows into the radiator tank 23 from the outlet 112.

  The cooling water that has risen in temperature due to heat transfer from the oil cooler 60 rises in the radiator tank 23 as its volume expands and its specific gravity decreases. By providing the inlet 111 on the upper side of the oil cooler 60, cooling water having a high water temperature flows into the heat release path 110 from the inlet 111. When the cooling water flows through the heat release path 110, heat is released from the outer peripheral surface of the heat release path 110 to the surroundings, and the coolant temperature decreases. The uppermost temperature of the radiator tank 23 is also lowered by heat conduction from the radiator tank 23 to the pipes forming the heat release path 110.

  Since the cooling water is an incompressible fluid, the cooling water in the heat release path 110 is pushed out as much as the cooling water in the radiator tank 23 flows out to the heat release path 110. Thereby, the cooling water flows into the radiator tank 23 from the heat release path 110 via the outlet 112, and the cooling water in the radiator tank 23 is replaced. By providing the outlet 112 of the heat release path 110 on the upstream side of the cooling water flow with respect to the arrangement of the oil cooler 60, cooling water having a low water temperature is reliably supplied around the oil cooler 60.

  Thus, since the flow of the cooling water circulating through the radiator tank 23 and the heat release path 110 is formed by the natural convection phenomenon, it is possible to suppress the high-temperature cooling water from staying in the radiator tank 23. Even when the motor 10 is stopped and the water pump 11 is stopped and the thermostat 74 is closed, the flow of cooling water can be formed around the oil cooler 60. Can always be supplied with low-temperature cooling water. Accordingly, it is possible to suppress a decrease in heat transfer efficiency from the oil cooler 60 to the cooling water, and to ensure the heat radiation performance of the cooling oil from the oil cooler 60. And since the overheating of the cooling water in the radiator tank 23 can be suppressed, the deterioration of the durability of the engine radiator 20 can be prevented.

  The circulation of the cooling water to the heat release path 110 is performed by a natural convection phenomenon, and an additional power source such as a pump for transferring the cooling water is not necessary. Therefore, the configuration for circulating the cooling water to the heat release path 110 can be simplified. And since a cooling water can be circulated without requiring external power, the deterioration of the fuel consumption of a hybrid vehicle can be avoided.

(Embodiment 2)
FIG. 4 is a schematic diagram illustrating an outline of the configuration of the heat exchanger according to the second embodiment. In the second embodiment, similarly to the first embodiment shown in FIG. 3, a heat release path 120 for allowing the cooling water to flow out from the radiator tank 23 is provided. The heat release path 120 has the same configuration as the heat release path 110 of Embodiment 1 in that the inlet 121 is connected to the uppermost part of the radiator tank 23. However, the heat release path 120 is different from the heat release path 110 of the first embodiment in that the outlet 122 is connected to the pipe 26.

  By providing the heat release path 120 that connects the uppermost portion of the radiator tank 23 and the pipe 26, the flow of the cooling water that flows through the radiator tank 23 and the heat release path 120 by natural convection phenomenon as in the first embodiment. Is formed. Therefore, it is possible to suppress the high-temperature cooling water from staying in the radiator tank 23, and it is possible to always supply cooling water having a relatively low temperature around the oil cooler 60. Accordingly, it is possible to suppress a decrease in heat transfer efficiency from the oil cooler 60 to the cooling water, and to ensure the heat radiation performance of the cooling oil from the oil cooler 60.

  In the second embodiment, the cooling water flowing out from the radiator tank 23 to the heat release path 120 returns to the radiator tank 23 via the pipe 26, the radiator tank 21, and the engine radiator 20. By including the engine radiator 20 in the cooling water circulation path, the cooling water cooled in the engine radiator 20 can be returned to the radiator tank 23. Therefore, cooling water having a lower temperature can be supplied to the periphery of the oil cooler 60, and heat transfer efficiency from the oil cooler 60 to the surrounding cooling water can be further improved, so that the heat dissipation performance of the cooling oil can be further improved. it can.

(Embodiment 3)
FIG. 5 is a schematic diagram illustrating an outline of the configuration of the heat exchanger according to the third embodiment. In the third embodiment, as in the first embodiment shown in FIG. 3, a heat release path 130 is provided for allowing cooling water to flow out from the radiator tank 23. The heat release path 130 has the same configuration as the heat release path 110 of the first embodiment in that the inlet 131 is connected to the uppermost part of the radiator tank 23. However, the heat release path 130 is different from the heat release path 110 of the first embodiment in that the outlet portion 132 is connected to the pipe 77.

  By providing the heat release path 130 that connects the uppermost portion of the radiator tank 23 and the pipe 77, the flow of the cooling water that flows through the radiator tank 23 and the heat release path 130 by natural convection phenomenon as in the first embodiment. Is formed. Therefore, it is possible to suppress the high-temperature cooling water from staying in the radiator tank 23, and it is possible to always supply cooling water having a relatively low temperature around the oil cooler 60. Accordingly, it is possible to suppress a decrease in heat transfer efficiency from the oil cooler 60 to the cooling water, and to ensure the heat radiation performance of the cooling oil from the oil cooler 60.

  In the third embodiment, the cooling water that has flowed from the radiator tank 23 to the heat release path 130 flows to the hermetic reserve tank 70 via the pipe 77. Cooling water that has been gas-liquid separated in the hermetic reserve tank 70 returns to the radiator tank 23 via the pipes 78 and 27. By including the hermetic reserve tank 70 in the cooling water circulation path, only the cooling water can be returned to the radiator tank 23. Therefore, cooling water having a lower temperature can be supplied to the periphery of the oil cooler 60, and the heat transfer efficiency from the oil cooler 60 to the surrounding cooling water can be further improved, so that the heat dissipation performance of the cooling oil can be further improved. .

  Since the heat release path 130 is connected to the pipe 77 through which the cooling water flows from the radiator tank 21 toward the hermetic reserve tank 70, the heat dissipation performance of the cooling oil in the oil cooler 60 is reduced without impairing the warm-up performance of the engine 10. Can be improved.

(Embodiment 4)
FIG. 6 is a schematic diagram illustrating an outline of the configuration of the heat exchanger according to the fourth embodiment. In the fourth embodiment, as in the first embodiment shown in FIG. 3, a heat release path 140 for allowing the cooling water to flow out from the radiator tank 23 is provided. The heat release path 140 has the same configuration as the heat release path 110 of Embodiment 1 in that the inlet 141 is connected to the uppermost part of the radiator tank 23. However, the heat release path 140 is different from the heat release path 110 of the first embodiment in that the outlet 142 is connected to the pipe 78.

  By providing the heat release path 140 that connects the uppermost portion of the radiator tank 23 and the pipe 78, the flow of the cooling water that flows through the radiator tank 23 and the heat release path 140 by natural convection phenomenon, as in the first embodiment. Is formed. Therefore, it is possible to suppress the high-temperature cooling water from staying in the radiator tank 23, and it is possible to always supply cooling water having a relatively low temperature around the oil cooler 60. Accordingly, it is possible to suppress a decrease in heat transfer efficiency from the oil cooler 60 to the cooling water, and to ensure the heat radiation performance of the cooling oil from the oil cooler 60.

  In Embodiment 4, since the heat release path 140 is connected to the pipe 78 extending in the vicinity of the radiator tank 23, the length of the heat release path 140 can be further reduced. Therefore, the configuration for circulating the cooling water to the heat release path 140 can be simplified, and the arrangement plan of the heat release path 140 can be made easier.

  Since the heat release path 140 is connected to the pipe 78 that is a path through which the cooling water flows out from the hermetic reserve tank 70, the heat dissipation performance of the cooling oil in the oil cooler 60 is improved without impairing the warm-up performance of the engine 10. be able to.

(Embodiment 5)
FIG. 7 is a schematic diagram showing an outline of the configuration of the heat exchanger of the fifth embodiment. In the fifth embodiment, in addition to the heat release path 130 of the third embodiment shown in FIG. 5, a heat release path 150 that connects the pipe 78 and the pipe 17 is provided. An inlet 151 of the heat release path 150 is connected to the pipe 78, and an outlet 152 of the heat release path 150 is connected to the pipe 17.

  As a result, the cooling water flowing out from the radiator tank 23 passes through the heat release path 130, the pipe 77, the sealed reserve tank 70, the pipe 78, the heat release path 150, the pipes 17 and 26, and the radiator tank 21. It can flow to the radiator 20. The cooling water cooled in the engine radiator 20 can be caused to flow into the radiator tank 23 by natural circulation, and the cooling water having a low water temperature can be supplied around the oil cooler 60.

  Alternatively, the cooling water flowing out from the hermetic reserve tank 70 can flow to the water pump 11 via the heat release path 150 and the pipes 17 and 18. The water pump 11 is activated when it is desired to temporarily improve the cooling performance of the cooling oil in the oil cooler 60 as compared with that during natural circulation. Therefore, since the cooling water having a low water temperature can be actively circulated through the periphery of the oil cooler 60, the heat transfer efficiency from the oil cooler 60 to the cooling water can be improved, and the cooling oil from the oil cooler 60 can be improved. The heat dissipation performance can be further improved.

  While the engine 10 is stopped, the water pump 11 is basically stopped because there is no need to circulate the cooling water in order to cool the engine 10. By using the water pump 11 that is stopped to transfer the cooling water, the heat radiation amount of the oil cooler 60 can be further increased without adding new heat exchange means. It is more desirable that the operation of the water pump 11 is an intermittent operation that can reliably increase the cooling capacity of the cooling oil to a necessary level and can prevent the engine 10 from being spoiled. .

  Although the embodiment of the present invention has been described as above, 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.

  10 engine, 11 water pump, 20 engine radiator, 21, 23 radiator tank, 23a upper part, 50 EV motor, 51 oil pump, 60 oil cooler, 74 thermostat, 110, 120, 130, 140, 150 heat release path.

Claims (2)

A heat exchanger used in a hybrid vehicle that travels with at least one of the power of an engine and a motor,
A radiator for cooling the engine coolant;
A tank for storing the cooling water flowing through the radiator;
An oil cooler for cooling the cooling oil of the motor,
The oil cooler is disposed inside the tank, and the cooling oil is cooled by exchanging heat between the cooling oil flowing in the oil cooler and the cooling water stored in the tank,
The tank is directly connected to a pipe for allowing the cooling water to flow out of the tank from a position above the oil cooler,
The tank is provided with an outlet for allowing the cooling water to flow into the tank from the pipe at a position below the oil cooler,
A thermostat for adjusting a flow rate of the cooling water flowing from the radiator to the engine;
The heat exchanger is characterized in that the cooling oil is cooled by the cooling water flowing through the pipe even when the thermostat is closed. A heat exchanger that is used in a hybrid vehicle that travels with the power of at least one of an engine and a motor and that transfers the cooling water by a water pump that circulates the cooling water of the engine,
A radiator for cooling the engine coolant;
A tank for storing the cooling water flowing through the radiator;
An oil cooler for cooling the cooling oil of the motor,
The oil cooler is disposed inside the tank, and the cooling oil is cooled by exchanging heat between the cooling oil flowing in the oil cooler and the cooling water stored in the tank,
The tank is directly connected to a pipe for allowing the cooling water to flow out of the tank from a position above the oil cooler,
A thermostat for adjusting a flow rate of the cooling water flowing from the radiator to the engine;
The heat exchanger is characterized in that the cooling oil is cooled by operating the water pump even when the thermostat is closed so that the cooling water flows through the pipe.

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