Vehicle cooling system

Abstract

To provide a vehicular cooling system capable of minimizing inflow of high-temperature cooling water from a high-temperature cooling system to a low-temperature cooling system while converting a cooling system accessory component for two systems into that for one system.SOLUTION: An upstream side tank 51 of a radiator 50 includes a first partition plate 51C for separating cooling water circulating in a first cooling water circulation circuit 21 from cooling water circulating in a second cooling water circulation circuit 23, and a downstream side tank 52 includes a second partition plate 52C for separating cooling water circulating in the first cooling water circulation circuit 21 from cooling water circulating in the second cooling water circulation circuit 23. The first partition plate 51C includes a communication hole 51D communicating with the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23. The radiator 50 includes a return passage 54R for returning cooling water caused to flow from the first cooling water circulation circuit 21 to the second cooling water circulation circuit 23 of the upstream side tank 51 to the first cooling water circulation circuit 21 of the downstream side tank 52.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a vehicle cooling system.

Background Art

[0002] Patent Document 1 describes a power cooling device for a hybrid vehicle, which includes a first cooling water circulation passage for cooling an internal combustion engine, a second cooling water circulation passage for cooling an electric motor, a radiator having a first tank that communicates the core portion with the first cooling water circulation passage and the second cooling water circulation passage, and a second tank that separates the first cooling water circulation passage and the second cooling water circulation passage. Further, Cited Document 1 describes providing a semi-separator plate inside the first tank that separates the first cooling water circulation passage and the second cooling water circulation passage except for a communication portion that communicates the first cooling water circulation passage and the second cooling water circulation passage.

[0003] The device described in Patent Document 1 aims to share the radiator tank and can suppress the inflow of the cooling water on the internal combustion engine side into the cooling system on the electric motor side even when sharing the reserve tank.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technology described in Patent Document 1, the inflow of high-temperature cooling water from the first cooling water circulation passage that constitutes the high-temperature cooling system into the second cooling water circulation passage that constitutes the low-temperature cooling system cannot be sufficiently suppressed, and it has been required to minimize the inflow of high-temperature cooling water.

[0006] The present invention has been made by paying attention to the above problems, and an object thereof is to provide a vehicle cooling system that can minimize the inflow of high-temperature cooling water from a high-temperature cooling system to a low-temperature cooling system while combining two systems of cooling system auxiliary parts into one system.

Means for Solving the Problems

[0007] The present invention includes one radiator having an upstream tank, a downstream tank, and a core portion connecting the upstream tank and the downstream tank, a first cooling water circulation circuit in which cooling water circulates between an engine and the radiator, and an electrical device having an allowable temperature lower than the maximum temperature of the cooling water circulating in the first cooling water circulation circuit and a second cooling water circulation circuit in which cooling water circulates between the radiator, and a vehicle cooling system that cools the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit with one radiator, wherein the upstream tank is provided with a first partition plate that partitions the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit, the downstream tank is provided with a second partition plate that partitions the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit, the first partition plate has a communication hole communicating with the first cooling water circulation circuit and the second cooling water circulation circuit, and the radiator has a return passage for returning the cooling water flowing from the first cooling water circulation circuit to the second cooling water circulation circuit in the upstream tank to the first cooling water circulation circuit in the downstream tank.

Effects of the Invention

[0008] According to the present invention as described above, it is possible to provide a vehicle cooling system that can minimize the inflow of high-temperature cooling water from a high-temperature cooling system to a low-temperature cooling system while combining two systems of cooling system auxiliary parts into one system.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0010] A vehicle cooling system according to an embodiment of the present invention includes one radiator having an upstream tank, a downstream tank, and a core portion connecting the upstream tank and the downstream tank, a first cooling water circulation circuit in which cooling water circulates between the engine and the radiator, and a second cooling water circulation circuit in which cooling water circulates between an electrical device having an allowable temperature lower than the maximum temperature of the cooling water circulating in the first cooling water circulation circuit and the radiator. The vehicle cooling system cools the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit with one radiator. A first partition plate for partitioning the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit is provided in the upstream tank, and a second partition plate for partitioning the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit is provided in the downstream tank. The first partition plate has a communication hole communicating with the first cooling water circulation circuit and the second cooling water circulation circuit. The radiator has a return passage for returning the cooling water flowing from the first cooling water circulation circuit to the second cooling water circulation circuit in the upstream tank to the first cooling water circulation circuit in the downstream tank. Thereby, the vehicle cooling system according to an embodiment of the present invention can minimize the inflow of high-temperature cooling water from the high-temperature cooling system to the low-temperature cooling system while combining two systems of cooling system auxiliary components into one system.

Example

[0011] Hereinafter, a vehicle cooling system according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 5 are diagrams showing a vehicle cooling system according to an embodiment of the present invention.

[0012] First, the configuration will be described. In FIG. 1, the vehicle 1 includes an engine (denoted as ENG in the figure) 2, a transmission (denoted as T / M in the figure) 3, and an electric motor (denoted as MGU in the figure) 4.

[0013] The engine 2 is an internal combustion engine type engine that uses gasoline or diesel fuel and generates a driving force (engine torque) for running. Inside the engine 2, a water jacket (not shown) through which cooling water flows is provided.

[0014] The transmission 3 is connected to the engine 2, and the driving force (engine torque) generated by the engine 2 is transmitted thereto. The transmission 3 is provided with a speed change mechanism (not shown), which changes the speed of the rotation transmitted from the engine 2 by the speed change mechanism and transmits it to driving wheels (not shown).

[0015] The electric motor 4 is electrically connected to a battery (not shown) via an inverter 5. The electric motor 4 is built in a part at the rear stage of the speed change mechanism in the transmission 3. The driving force for traveling (motor torque) generated by the electric motor 4 is transmitted to the driving wheels without passing through the speed change mechanism of the transmission 3.

[0016] An oil cooler (denoted as O / C in the figure) 4A is provided for the electric motor 4, and the oil cooler 4A cools the oil flowing inside the electric motor 4 by heat exchange with cooling water.

[0017] The vehicle 1 is provided with one radiator 50. The radiator 50 cools the cooling water by heat exchange with the traveling wind. The radiator 50 includes a high-temperature part 50H that cools the relatively high-temperature cooling water taken in from the engine 2 and a low-temperature part 50L that cools the relatively low-temperature cooling water taken in from the oil cooler 4A.

[0018] The vehicle 1 is provided with a first cooling water circulation circuit 21. The first cooling water circulation circuit 21 connects the engine 2 and the radiator 50 and circulates the cooling water between the engine 2 and the radiator 50. The radiator 50 cools the cooling water circulating in the first cooling water circulation circuit 21.

[0019] The first cooling water circulation circuit 21 is provided with a feed passage 21A for sending the cooling water from the engine 2 to the radiator 50, and the feed passage 21A is connected to the upstream tank 51 of the radiator 50.

[0020] The first cooling water circulation circuit 21 includes a return passage 21B that returns the cooling water cooled by the radiator 50 to the engine 2, and the return passage 21B is connected to the downstream tank 52 of the radiator 50.

[0021] The vehicle 1 is equipped with a mechanical water pump (denoted as WP in the figure) 32. The water pump 32 is provided at the engine 2 side end of the return passage 21B, and is driven by the engine 2 to send the cooling water sucked from the return passage 21B to the engine 2.

[0022] A thermostat 33 is provided between the engine 2 and the feed passage 21A. When the temperature of the cooling water is lower than a predetermined temperature, the thermostat 33 closes the valve to prevent the circulation of the cooling water in the first cooling water circulation circuit 21. When the temperature of the cooling water becomes higher than the predetermined temperature, the thermostat 33 opens the valve to allow the circulation of the cooling water in the first cooling water circulation circuit 21. That is, when the thermostat 33 is open, the cooling water sent to the engine 2 by the water pump 32 is discharged from the engine 2 after cooling the engine 2. Then, the cooling water is introduced into the radiator 50 through the feed passage 21A, cooled in the radiator 50, and then returned to the water pump 32 through the return passage 21B.

[0023] The vehicle 1 is equipped with an accessory cooling water circulation circuit 22. The heater core 31 and the EGR cooler 30 are connected to the engine 2 via the accessory cooling water circulation circuit 22. The heater core 31 heats a passenger compartment (not shown) by heat exchange with the high-temperature cooling water introduced from the engine 2. The EGR cooler 30 cools the exhaust gas discharged from the engine 2 by heat exchange with the cooling water. The exhaust gas cooled by the EGR cooler 30 is sent to the intake path of the engine 2.

[0024] The cooling water circulation circuit 22 for auxiliary machines includes a feed passage 22A that sends cooling water from the engine 2 to the heater core 31, a feed passage 22B that sends cooling water from the engine 2 to the EGR cooler 30, and a return passage 22C that returns the cooling water from the heater core 31 and the EGR cooler 30 to the engine 2. The return passage 22C converges so as to merge the cooling water from the heater core 31 and the cooling water from the EGR cooler 30. The upstream ends of the feed passages 22A and 22B are connected to the engine 2 without passing through the thermostat 33. The downstream end of the return passage 22C is connected to the suction side of the water pump 32. Therefore, during the operation of the engine 2, the cooling water always circulates through the cooling water circulation circuit 22 for auxiliary machines regardless of whether the thermostat 33 is closed or open.

[0025] The vehicle 1 is provided with a second cooling water circulation circuit 23. The oil cooler 4A is connected to the radiator 50 via the second cooling water circulation circuit 23. The radiator 50 cools the cooling water circulating through the second cooling water circulation circuit 23.

[0026] The second cooling water circulation circuit 23 includes a feed passage 23A that sends cooling water from the oil cooler 4A to the radiator 50, and a return passage 23B that returns the cooling water from the radiator 50 to the oil cooler 4A. An electrically operated water pump (denoted as EWP in the figure) 37 and an inverter (denoted as INV in the figure) 5 are provided in the return passage 23B. The cooling water circulating through the second cooling water circulation circuit 23 cools the oil of the oil cooler 4A and the inverter 5.

[0027] Therefore, the cooling water circulates between the oil cooler 4A and the inverter 5 and the radiator 50 in the second cooling water circulation circuit 23. The oil cooler 4A and the inverter 5 are electrical devices whose allowable temperature is lower than the maximum temperature of the cooling water circulating through the first cooling water circulation circuit 21.

[0028] An inlet 51A to the radiator 50 of the first cooling water circulation circuit 21 and an inlet 51B to the radiator 50 of the second cooling water circulation circuit 23 are formed in the radiator 50.

[0029] The radiator 50 is formed with an outlet 52A of the radiator 50 for the first cooling water circulation circuit 21 and an outlet 52B of the radiator 50 for the second cooling water circulation circuit 23.

[0030] In FIG. 2, the radiator 50 includes an upstream tank 51 into which cooling water enters, a downstream tank 52 from which the cooling water exits, and a core portion 53 that connects the upstream tank 51 and the downstream tank 52. The upstream tank 51 and the downstream tank 52 are adapted to temporarily store the cooling water and are respectively connected to one end side and the other end side of the core portion 53. The core portion 53 cools the cooling water by heat exchange with the running air. A cap 55 is provided on the radiator 50, and one reservoir tank 56 for storing replenishing cooling water is connected to the cap 55 via a pipe.

[0031] The upstream tank 51 is formed with an inlet 51A of the radiator 50 for the first cooling water circulation circuit 21 and an inlet 51B of the radiator 50 for the second cooling water circulation circuit 23.

[0032] The downstream tank 52 is formed with an outlet 52A of the radiator 50 for the first cooling water circulation circuit 21 and an outlet 52B of the radiator 50 for the second cooling water circulation circuit 23.

[0033] The upstream tank 51 is provided with a first partition plate 51C that partitions the cooling water circulating in the first cooling water circulation circuit 21 from the cooling water circulating in the second cooling water circulation circuit 23. By providing the first partition plate 51C in the upstream tank 51, a high-temperature side space 51H in which the cooling water circulating in the first cooling water circulation circuit 21 is temporarily stored and a low-temperature side space 51L in which the cooling water circulating in the second cooling water circulation circuit 23 is temporarily stored are formed.

[0034] In the downstream tank 52, a second partition plate 52C is provided to partition the cooling water circulating in the first cooling water circulation circuit 21 and the cooling water circulating in the second cooling water circulation circuit 23. Due to the provision of the second partition plate 52C in the downstream tank 52, a high-temperature side space 52H in which the cooling water circulating in the first cooling water circulation circuit 21 is temporarily stored and a low-temperature side space 52L in which the cooling water circulating in the second cooling water circulation circuit 23 is temporarily stored are formed.

[0035] The high-temperature side spaces 51H, 52H in the radiator 50 and the tubes 54 communicating therewith constitute the high-temperature part 50H of the radiator 50. Further, the high-temperature part 50H constitutes a part of the first cooling water circulation circuit 21. The low-temperature side spaces 51L, 52L in the radiator 50 and the tubes 54 communicating therewith constitute the low-temperature part 50L of the radiator 50. Further, the low-temperature part 50L constitutes a part of the second cooling water circulation circuit 23.

[0036] The first partition plate 51C has communication holes 51D communicating with the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23. In FIG. 2, one communication hole 51D is formed in the first partition plate 51C, but a plurality of communication holes 51D may be formed in the first partition plate 51C.

[0037] The core part 53 has a plurality of tubes 54 through which the cooling water flows from the upstream tank 51 to the downstream tank 52. Fins (not shown) for increasing the contact area with the running air are provided on the surface of the tube 54.

[0038] Here, in this embodiment, the cooling water circulating in the first cooling water circulation circuit 21 and the cooling water circulating in the second cooling water circulation circuit 23 are cooled by one radiator 50. And a first partition plate 51C for partitioning the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23 is provided in the upstream tank 51 of the radiator 50. Therefore, it is possible to suppress the mixing of the high-temperature cooling water circulating in the first cooling water circulation circuit 21 and the low-temperature cooling water circulating in the second cooling water circulation circuit 23.

[0039] In addition, a second partition plate 52C that separates the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23 is provided in the downstream tank 52 of the radiator 50. Therefore, it is possible to prevent the high-temperature cooling water circulating in the first cooling water circulation circuit 21 from mixing with the low-temperature cooling water circulating in the second cooling water circulation circuit 23.

[0040] If the first partition plate 51C and the second partition plate 52C completely block the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23, a reservoir tank 56 is required for each of the portion of the first cooling water circulation circuit 21 and the portion of the second cooling water circulation circuit 23 in the radiator 50. If the radiator 50 is provided with two reservoir tanks 56, it will cause complication of the structure and increase in manufacturing cost, which is not preferable. Therefore, in the present embodiment, the first partition plate 51C has a communication hole 51D that communicates the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23. Thereby, since the circulation of the cooling water through the communication hole 51D is allowed, the reservoir tank 56 and the piping connected to the reservoir tank 56 can be made into one.

[0041] On the other hand, since the first partition plate 51C has the communication hole 51D, high-temperature cooling water may flow from the first cooling water circulation circuit 21 into the second cooling water circulation circuit 23, and the oil cooler 4A and the inverter 5 may not be sufficiently cooled. Therefore, it is desirable to minimize the inflow of high-temperature cooling water from the high-temperature cooling system to the low-temperature cooling system while providing the communication hole 51D that enables the reservoir tank 56 and the piping attached thereto to be made into one system.

[0042] Therefore, in order to minimize the inflow of high-temperature cooling water from the high-temperature cooling system to the low-temperature cooling system, the radiator 50 has a return passage 54R that returns the cooling water flowing from the first cooling water circulation circuit 21 to the second cooling water circulation circuit 23 in the upstream tank 51 to the first cooling water circulation circuit 21 of the downstream tank 52.

[0043] The return passage 54R is constituted by a part of the plurality of tubes 54 located at the boundary between the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23 in the radiator 50. That is, a part of the existing plurality of tubes 54 functions as the return passage 54R.

[0044] The upstream tank 51 is provided with a guide portion 51E. The guide portion 51E is formed in a convex shape protruding toward the core portion 53 in the low-temperature side space 51L of the upstream tank 51. Note that the convex guide portion 51E has a concave shape when the upstream tank 51 is viewed from the outside.

[0045] The guide portion 51E is provided between the first partition plate 51C and the inlet 51B of the second cooling water circulation circuit 23 to the radiator 50. The guide portion 51E guides the cooling water flowing from the first partition plate 51C toward the inlet 51B of the radiator 50 to the core portion 53, and also guides the cooling water flowing from the inlet 51B of the radiator 50 toward the first partition plate 51C to the core portion 53.

[0046] Specifically, the guide portion 51E has a communication hole side wall portion 51F facing the communication hole 51D, and the communication hole side wall portion 51F is inclined so as to be away from the communication hole 51D as it approaches the core portion 53. Thereby, the cooling water flowing from the first partition plate 51C toward the inlet 51B of the radiator 50 hits the communication hole side wall portion 51F of the guide portion 51E and changes its direction, and is guided toward the core portion 53. In this embodiment, in order to guide the cooling water more smoothly, the communication hole side wall portion 51F is inclined in an arc so as to be away from the communication hole 51D as it approaches the core portion 53.

[0047] Further, the guide portion 51E has an inlet side wall portion 51G facing the inlet 51B to the radiator 50 of the second cooling water circulation circuit 23, and the inlet side wall portion 51G is inclined so as to move away from the inlet 51B to the radiator 50 of the second cooling water circulation circuit 23 as it approaches the core portion 53. Thereby, the cooling water flowing from the inlet 51B to the radiator 50 toward the first partition plate 51C hits the inlet side wall portion 51G of the guide portion 51E and changes its direction, and is guided toward the core portion 53. In the present embodiment, in order to guide the cooling water more smoothly, the inlet side wall portion 51G is inclined in an arc so as to move away from the inlet 51B to the radiator 50 of the second cooling water circulation circuit 23 as it approaches the core portion 53.

[0048] In the present embodiment, as a result of the guide portion 51E guiding the cooling water toward the core portion 53, mixing of the high-temperature cooling water in the first cooling water circulation circuit 21 and the low-temperature cooling water in the second cooling water circulation circuit 23 in the upstream side tank 51 is suppressed.

[0049] The end portion of the tube 54 constituting the return passage 54R on the upstream side tank 51 side is connected to a position sandwiched between the first partition plate 51C and the guide portion 51E in the second cooling water circulation circuit 23 of the upstream side tank 51.

[0050] The end portion of the tube 54 constituting the return passage 54R on the downstream side tank 52 side is connected to the first cooling water circulation circuit 21 side of the downstream side tank 52.

[0051] The distance L1 between the end portion of the guide portion 51E on the core portion 53 side and the core portion 53 is made equal to or less than the distance L2 between the end portion of the communication hole 51D on the core portion 53 side and the core portion 53.

[0052] Next, the flow of the cooling water in the radiator 50 in the vehicle cooling system will be described. In FIG. 1, when the thermostat 33 is closed, the cooling water does not circulate in the first cooling water circulation circuit 21, and the cooling water circulates in the second cooling water circulation circuit 23. Therefore, as shown in FIG. 3, the cooling water introduced from the inlet 51B of the upstream tank 51 into the low-temperature side space 51L passes through the tube 54 of the core portion 53, flows into the low-temperature side space 52L of the downstream tank 52, and is discharged from the outlet 52B. Further, the cooling water passes through the tube 54 that communicates with both the low-temperature side space 51L of the upstream tank 51 and the low-temperature side space 52L of the downstream tank 52 inside the tube 54 of the core portion 53.

[0053] Here, the return passage 54R communicates with the low-temperature side space 51L of the upstream tank 51 and the high-temperature side space 52H of the downstream tank 52, and the cooling water does not circulate in the first cooling water circulation circuit 21 including the high-temperature side space 52H. Therefore, the cooling water in the low-temperature side space 51L of the upstream tank 51 does not flow into the high-temperature side space 52H of the downstream tank 52.

[0054] In FIG. 1, when the thermostat 33 is open, the cooling water circulates in the first cooling water circulation circuit 21, and the cooling water also circulates in the second cooling water circulation circuit 23. Therefore, as shown in FIG. 4, the cooling water introduced from the inlet 51A of the upstream tank 51 into the high-temperature side space 51H passes through the tube 54 of the core portion 53, flows into the high-temperature side space 52H of the downstream tank 52, and is discharged from the outlet 52A. Further, the cooling water that has flowed from the high-temperature side space 51H to the low-temperature side space 51L through the communication hole 51D due to the pressure difference is returned to the high-temperature side space 52H of the downstream tank 52 through the return passage 54R. In particular, in this embodiment, the cooling water that has flowed into the low-temperature side space 51L hits the communication hole side wall portion 51F of the guide portion 51E and changes its direction toward the return passage 54R of the core portion 53, so that the cooling water can be effectively returned to the high-temperature side space 52H of the downstream tank 52 through the return passage 54R.

[0055] In FIG. 5, when the cooling water in the reservoir tank 56 is poured into the radiator 50 through the cap 55, the cooling water that has flowed into the high-temperature side space 51H of the upstream tank 51 flows through the tube 54 of the core portion 53 into the high-temperature side space 52H of the downstream tank 52. Then, the cooling water in the high-temperature side space 52H flows through the return passage 54R into the low-temperature side space 51L of the upstream tank 51. Thereby, the entire inside of the radiator 50 can be filled with the cooling water. Also, the air in the low-temperature side space 51L can be discharged from the inlet 51B through the communication hole 51D above the inlet 51B into the high-temperature side space 51H. That is, the communication hole 51D can also be used for air bleeding. The air discharged into the high-temperature side space 51H accumulates in the vicinity of the lower part of the cap 55, so it can be easily discharged to the outside by removing the cap 55. Note that not only during the injection of the cooling water, but also during the operation of the engine 2, the air in the low-temperature side space 51L can be discharged into the high-temperature side space 51H through the communication hole 51D.

[0056] As described above, in the vehicle cooling system of this embodiment, the upstream tank 51 is provided with a first partition plate 51C that partitions the cooling water circulating in the first cooling water circulation circuit 21 and the cooling water circulating in the second cooling water circulation circuit 23, and the downstream tank 52 is provided with a second partition plate 52C that partitions the cooling water circulating in the first cooling water circulation circuit 21 and the cooling water circulating in the second cooling water circulation circuit 23. Also, the first partition plate 51C has a communication hole 51D that communicates with the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23. And the radiator 50 has a return passage 54R that returns the cooling water flowing from the first cooling water circulation circuit 21 to the second cooling water circulation circuit 23 in the upstream tank 51 to the first cooling water circulation circuit 21 of the downstream tank 52.

[0057] Thus, in this embodiment, one radiator 50 cools the cooling water circulating in the first cooling water circulation circuit 21 and the cooling water circulating in the second cooling water circulation circuit 23, and since the first partition plate 51C of the radiator 50 has a communication hole 51D that communicates the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23, the reservoir tank 56 and the piping connected to the reservoir tank 56 can be made into one. Therefore, the two-system cooling system auxiliary components can be made into one system.

[0058] Also, in this embodiment, since the upstream tank 51 includes the first partition plate 51C that partitions the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23, it is possible to suppress the mixing of the high-temperature cooling water circulating in the first cooling water circulation circuit 21 and the low-temperature cooling water circulating in the second cooling water circulation circuit 23. Further, since the downstream tank 52 includes the second partition plate 52C that partitions the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23, it is possible to suppress the mixing of the high-temperature cooling water circulating in the first cooling water circulation circuit 21 and the low-temperature cooling water circulating in the second cooling water circulation circuit 23.

[0059] Furthermore, in this embodiment, the upstream tank 51 has a return passage 54R that returns the cooling water flowing from the first cooling water circulation circuit 21 to the second cooling water circulation circuit 23 to the first cooling water circulation circuit 21 of the downstream tank 52. Thereby, the inflow of high-temperature cooling water from the high-temperature cooling system to the low-temperature cooling system can be minimized.

[0060] As a result, while making the two-system cooling system auxiliary components into one system, the inflow of high-temperature cooling water from the high-temperature cooling system to the low-temperature cooling system can be minimized.

[0061] Also, in the vehicle cooling system of this embodiment, the core part 53 has a plurality of tubes 54 through which cooling water flows from the upstream tank 51 to the downstream tank 52. And the return passage 54R is constituted by some of the plurality of tubes 54 that are located at the boundary between the first cooling water circulation circuit 21 and the second cooling water circulation circuit 23 in the radiator 50.

[0062] As a result, in the upstream tank 51, the cooling water that has flowed from the first cooling water circulation circuit 21 into the second cooling water circulation circuit 23 can be returned to the first cooling water circulation circuit 21 of the downstream tank 52 by using a part of the existing tube 54, and it is possible to avoid complication of the structure and increase in manufacturing cost as compared with the case of newly providing a dedicated return passage 54R.

[0063] Further, in the vehicle cooling system of the present embodiment, the upstream tank 51 has a guide portion 51E between the first partition plate 51C and the inlet 51B of the second cooling water circulation circuit 23 to the radiator 50, which guides the cooling water flowing from the first partition plate 51C toward the inlet 51B of the radiator 50 to the core portion 53, and also guides the cooling water flowing from the inlet 51B of the radiator 50 toward the first partition plate 51C to the core portion 53. And the end portion on the upstream tank 51 side of the tube 54 constituting the return passage 54R is connected to a position sandwiched between the first partition plate 51C and the guide portion 51E in the second cooling water circulation circuit 23 of the upstream tank 51. Further, the end portion on the downstream tank 52 side of the tube 54 constituting the return passage 54R is connected to the first cooling water circulation circuit 21 side of the downstream tank 52.

[0064] As a result, the cooling water that has flowed from the first cooling water circulation circuit 21 into the second cooling water circulation circuit 23 can be made to flow in a direction toward the tube 54 constituting the return passage 54R by the guide portion 51E. For this reason, it is possible to minimize the flow of the high-temperature cooling water flowing in from the first cooling water circulation circuit 21 side of the upstream tank 51 to the second cooling water circulation circuit 23 side of the downstream tank 52. Also, it is possible to suppress the flow of the low-temperature cooling water flowing in from the inlet 51B on the second cooling water circulation circuit 23 side of the upstream tank 51 to the first cooling water circulation circuit 21 side of the downstream tank 52.

[0065] Further, in the vehicle cooling system of the present embodiment, the distance L1 between the end portion on the core portion 53 side of the guide portion 51E and the core portion 53 is equal to or less than the distance L2 between the end portion on the core portion 53 side of the communication hole 51D and the core portion 53.

[0066] As a result, all of the cooling water that has flowed from the first cooling water circulation circuit 21 into the second cooling water circulation circuit 23 through the communication hole 51D of the first partition plate 51C can collide with the guide portion 51E, and can be redirected toward the tube 54 that constitutes the return passage 54R. For this reason, it is possible to minimize the flow of the high-temperature cooling water that has flowed in from the first cooling water circulation circuit 21 side of the upstream tank 51 to the second cooling water circulation circuit 23 side of the downstream tank 52.

[0067] Also, in the vehicle cooling system of the present embodiment, the guide portion 51E has a communication hole side wall portion 51F that faces the communication hole 51D. The communication hole side wall portion 51F is inclined so as to move away from the communication hole 51D as it approaches the core portion 53.

[0068] As a result, the cooling water that has flowed from the first cooling water circulation circuit 21 into the second cooling water circulation circuit 23 can be smoothly redirected toward the tube 54 that constitutes the return passage 54R. For this reason, it is possible to minimize the flow of the high-temperature cooling water that has flowed in from the first cooling water circulation circuit 21 side of the upstream tank 51 to the second cooling water circulation circuit 23 side of the downstream tank 52.

[0069] Also, in the vehicle cooling system of the present embodiment, the communication hole side wall portion 51F is inclined in an arc so as to move away from the communication hole 51D as it approaches the core portion 53.

[0070] As a result, the cooling water that has flowed from the first cooling water circulation circuit 21 into the second cooling water circulation circuit 23 can be redirected even more smoothly toward the tube 54 that constitutes the return passage 54R. For this reason, it is possible to minimize the flow of the high-temperature cooling water that has flowed in from the first cooling water circulation circuit 21 side of the upstream tank 51 to the second cooling water circulation circuit 23 side of the downstream tank 52.

[0071] Also, in the vehicle cooling system of this embodiment, the guide part 51E has an inlet side wall part 51G facing the inlet 51B to the radiator 50 of the second cooling water circulation circuit 23. The inlet side wall part 51G is inclined so as to move away from the inlet 51B to the radiator 50 of the second cooling water circulation circuit 23 as it approaches the core part 53.

[0072] Thereby, the low-temperature cooling water flowing in from the inlet 51B on the second cooling water circulation circuit 23 side of the upstream side tank 51 can be smoothly changed in the direction toward the core part 53. For this reason, it is possible to suppress the low-temperature cooling water from flowing to the first cooling water circulation circuit 21 side.

[0073] Also, in the vehicle cooling system of this embodiment, the inlet side wall part 51G is inclined in an arc so as to move away from the inlet 51B to the radiator 50 of the second cooling water circulation circuit 23 as it approaches the core part 53.

[0074] Thereby, the low-temperature cooling water flowing in from the inlet 51B on the second cooling water circulation circuit 23 side of the upstream side tank 51 can be changed even more smoothly in the direction toward the core part 53. For this reason, it is possible to suppress the low-temperature cooling water from flowing to the first cooling water circulation circuit 21 side.

[0075] Although embodiments of the present invention have been disclosed, it is obvious that those skilled in the art can make changes without departing from the scope of the present invention. It is intended that all such modifications and equivalents be included in the following claims.

Explanation of Reference Numerals

[0076] 1... Vehicle, 2... Engine, 4A... Oil cooler (electrical equipment), 5... Inverter (electrical equipment), 21... First cooling water circulation circuit, 23... Second cooling water circulation circuit, 50... Radiator, 51... Upstream tank, 51B... Inlet, 51C... First partition plate, 51D... Communication hole, 51E... Guide part, 51F... Communication hole side wall part, 51G... Inlet side wall part, 52... Downstream tank, 52C... Second partition plate, 53... Core part, 54... Tube, 54R... Return passage, L1... Distance, L2... Distance

Claims

1. One radiator having an upstream tank, a downstream tank, and a core portion connecting the upstream tank and the downstream tank; A first cooling water circulation circuit in which cooling water circulates between the engine and the radiator; A second cooling water circulation circuit in which cooling water circulates between an electric device having an allowable temperature lower than the maximum temperature of the cooling water circulating in the first cooling water circulation circuit and the radiator; Comprising: A vehicle cooling system that cools the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit with one radiator, A first partition plate for partitioning the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit is provided in the upstream tank, A second partition plate for partitioning the cooling water circulating in the first cooling water circulation circuit and the cooling water circulating in the second cooling water circulation circuit is provided in the downstream tank, The first partition plate has a communication hole communicating with the first cooling water circulation circuit and the second cooling water circulation circuit, The radiator has a return passage for returning the cooling water flowing from the first cooling water circulation circuit to the second cooling water circulation circuit in the upstream tank to the first cooling water circulation circuit in the downstream tank. The vehicle cooling system is characterized by this.

2. The core portion has a plurality of tubes through which cooling water flows from the upstream tank to the downstream tank, The return passage is constituted by a part of the plurality of tubes located at the boundary between the first cooling water circulation circuit and the second cooling water circulation circuit in the radiator. The vehicle cooling system according to claim 1 is characterized by this.

3. The upstream tank has a guide portion for guiding the cooling water from the first partition plate toward the inlet of the radiator to the core portion and guiding the cooling water from the inlet of the radiator toward the first partition plate to the core portion between the first partition plate and the inlet of the second cooling water circulation circuit to the radiator, The end portion of the tube on the upstream tank side constituting the return passage is connected to a position sandwiched between the first partition plate and the guide portion in the second cooling water circulation circuit of the upstream tank, The end portion of the tube on the downstream tank side constituting the return passage is connected to the first cooling water circulation circuit side of the downstream tank. The vehicle cooling system according to claim 2 is characterized by this.

4. The distance between the end of the guide part on the core part side and the core part is less than or equal to the distance between the end of the communication hole on the core part side and the core part. The vehicle cooling system according to claim 3, characterized in that.

5. The guide part has a communication hole side wall part facing the communication hole, The communication hole side wall part is inclined so as to be displaced in the direction from the first partition plate toward the inlet of the radiator of the second cooling water circulation circuit as it approaches the core part. The vehicle cooling system according to claim 3, characterized in that.

6. The communication hole side wall part is inclined in an arc so as to be displaced in the direction from the first partition plate toward the inlet of the radiator of the second cooling water circulation circuit as it approaches the core part. The vehicle cooling system according to claim 5, characterized in that.

7. The guide part has an inlet side wall part facing the inlet of the radiator of the second cooling water circulation circuit, The inlet side wall part is inclined so as to be displaced in the direction from the inlet of the radiator of the second cooling water circulation circuit toward the first partition plate as it approaches the core part. The vehicle cooling system according to claim 3, characterized in that.

8. The inlet side wall part is inclined in an arc so as to be displaced in the direction from the inlet of the radiator of the second cooling water circulation circuit toward the first partition plate as it approaches the core part. The vehicle cooling system according to claim 7, characterized in that.

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