JP7445205B2 - Vehicle cooling system - Google Patents

Description

The present invention relates to a cooling device for a vehicle, and particularly to a cooling device for a vehicle that includes a cooling water flow path for an engine and an oil flow path for oil that lubricates the inside of a transmission.

Conventionally, there has been a flow path through which cooling water flows to cool the engine as the power source of a vehicle, a flow path through which cooling water flows to cool the motor drive device such as the electric motor as the power source and its high voltage components, and a speed change path. A circuit is known that includes a flow path through which oil flows to lubricate the inside of the machine, and in which heat exchanges between cooling water that cools the motor drive device and oil that lubricates the inside of the transmission.

For example, Patent Document 1 discloses a technique of exchanging heat between first oil that lubricates the toroidal transmission itself and cooling water for a motor drive device. Further, in the technology of Patent Document 1, a power transmission mechanism (gear) provided on the downstream side of a power transmission path of a toroidal transmission is lubricated with a second oil different from the first oil, and the second oil is lubricated with a second oil different from the first oil. Heat is exchanged between the oil and the coolant for the motor drive device or the coolant for the engine, whichever has a higher temperature.

Japanese Patent Application Publication No. 2015-001301

Here, in order to improve the fuel efficiency of the vehicle, it is possible to reduce the driving resistance in the transmission. Therefore, especially in a stepped transmission, it is preferable that the viscosity of the transmission oil, which is the lubricating oil in the transmission, is low, and it is effective to increase the temperature of the transmission oil. On the other hand, if the temperature of the transmission oil rises excessively, there is a possibility that parts such as gears in the transmission will suffer from poor lubrication, and it is also necessary to suppress the excessive temperature rise.

However, in the technology of Patent Document 1, the oil that lubricates the speed change mechanism of the transmission exchanges heat with the cooling water of the motor drive device, so the oil that lubricates the speed change mechanism of the transmission exchanges heat with the cooling water of the motor drive device. Depending on the heat generation state, the temperature of the cooling water may become high, and there is a concern that the temperature of the transmission oil may become too high. In addition, the oil that lubricates the power transmission mechanism exchanges heat with the motor drive device or engine cooling water, so if the cooling water temperature is high, the oil temperature may become too high. There is a concern that this may occur.

Therefore, the present invention has been made to solve the above-mentioned problems, and it raises the temperature of transmission oil early to reduce driving resistance, and suppresses excessive temperature rise to prevent poor lubrication within the transmission. An object of the present invention is to provide a cooling device for a vehicle that can suppress.

In order to achieve the above object, the present invention includes a cooling water passage through which cooling water for cooling an engine flows, and an oil passage through which oil for lubricating the inside of a transmission flows. a first heat exchanger that exchanges heat between the cooling water in the passage and the oil in the oil passage, and through which the entire amount of oil exiting the transmission flows regardless of the temperature of the oil when the oil is circulated in the oil passage; , a second heat exchanger that exchanges heat between the running wind received by the vehicle and the oil in the oil flow path, and a second heat exchanger that branches downstream from the first heat exchanger and bypasses the second heat exchanger. A first oil flow path that circulates oil to the transmission, and a second oil flow path that branches downstream from the first heat exchanger and that circulates oil to the transmission through the second heat exchanger. The oil flow rate flowing through the first oil flow path and the oil flow rate flowing through the second oil flow path can be adjusted while keeping the oil flow rate flowing through the oil flow path and the first heat exchanger constant. It is characterized by being provided with an oil flow rate adjustment device.

According to the present invention configured in this way, the oil flow path is provided with heat exchange between the cooling water in the cooling water flow path and the oil in the oil flow path, and the temperature of the oil is changed when the oil is circulated in the oil flow path. a first heat exchanger through which the entire amount of oil leaving the transmission flows regardless of a first oil flow path that branches downstream from the exchanger and circulates oil to the transmission bypassing the second heat exchanger; and a first oil flow path that branches downstream from the first heat exchanger, and A second oil flow path that circulates oil through the second heat exchanger to the transmission; and a second oil flow path that circulates oil through the first heat exchanger while keeping the flow rate constant. Since the first heat exchanger is provided with an oil flow rate adjustment device that can adjust the oil flow rate that flows through the second oil flow path and the oil flow rate that flows through the second oil flow path, the first heat exchanger uses the high temperature first cooling water that has received heat from the engine to The temperature of the transmission oil can be raised quickly, and in the second heat exchanger, the transmission oil after being heated can be cooled by the running wind. Therefore, by adjusting the oil flow rate flowing through the first oil flow path and the oil flow rate flowing through the second oil flow path depending on the degree of rise in the temperature of the transmission oil using the oil flow adjustment device, It is possible to quickly raise the temperature of the transmission oil to reduce the driving resistance of the transmission, and to suppress excessive temperature rise, thereby suppressing poor lubrication within the transmission.
Further, in order to achieve the above object, the present invention includes a cooling water passage through which cooling water for cooling the engine flows, and an oil passage through which oil for lubricating the inside of the transmission flows, and the oil passage includes: A first heat exchanger that exchanges heat between the cooling water in the cooling water flow path and oil in the oil flow path, and a second heat exchanger that exchanges heat between the running wind received by the vehicle and the oil in the oil flow path. a first oil flow path that branches downstream from the first heat exchanger and circulates oil to the transmission bypassing the second heat exchanger; and a first oil flow path downstream from the first heat exchanger. A second oil flow path that branches off at the second heat exchanger and circulates the oil to the transmission; The oil coming out of the exchanger is made to flow through both the first oil flow path and the second oil flow path, and the oil flow rate flowing through the first oil flow path and the oil flow rate flowing through the second oil flow path are controlled. and an adjustable oil flow rate adjustment device.
According to the present invention configured in this way, the first heat exchanger can quickly raise the temperature of the transmission oil by the high temperature first cooling water received from the engine, and the second heat exchanger In this case, the transmission oil after being heated can be cooled down by the wind while the vehicle is running. Therefore, by adjusting the oil flow rate flowing through the first oil flow path and the oil flow rate flowing through the second oil flow path depending on the degree of rise in the temperature of the transmission oil using the oil flow adjustment device, It is possible to quickly raise the temperature of the transmission oil to reduce the driving resistance of the transmission, and to suppress excessive temperature rise, thereby suppressing poor lubrication within the transmission.
Further, in order to achieve the above object, the present invention includes a cooling water passage through which cooling water for cooling the engine flows, and an oil passage through which oil for lubricating the inside of the transmission flows, and the oil passage includes: A first heat exchanger that exchanges heat between the cooling water in the cooling water flow path and oil in the oil flow path, and a second heat exchanger that exchanges heat between the running wind received by the vehicle and the oil in the oil flow path. a first oil flow path that branches downstream from the first heat exchanger and circulates oil to the transmission bypassing the second heat exchanger; and a first oil flow path downstream from the first heat exchanger. A second oil flow path that branches off at the second heat exchanger and circulates the oil to the transmission; An oil flow rate adjustment device that can adjust the oil flow rate flowing through the oil flow path and the oil flow rate flowing through the second oil flow path is provided, and the oil flow rate adjustment device is provided in the first oil flow path. It is characterized by the fact that it is not
According to the present invention configured in this way, the first heat exchanger can quickly raise the temperature of the transmission oil by the high temperature first cooling water received from the engine, and the second heat exchanger In this case, the transmission oil after being heated can be cooled down by the wind while the vehicle is running. Therefore, by adjusting the oil flow rate flowing through the first oil flow path and the oil flow rate flowing through the second oil flow path depending on the degree of rise in the temperature of the transmission oil using the oil flow adjustment device, It is possible to quickly raise the temperature of the transmission oil to reduce the driving resistance of the transmission, and to suppress excessive temperature rise, thereby suppressing poor lubrication within the transmission.

Further, in the present invention, preferably, the cooling water flow path further includes a radiator for cooling the cooling water, and the second heat exchanger of the oil flow path is located at a position that does not overlap with the radiator when viewed from the front of the vehicle. It is provided.
According to the present invention configured in this way, the second heat exchanger is less likely to receive the traveling wind heated by the heat of the radiator, and thereby the second heat exchanger for cooling the transmission oil is It is possible to suppress an increase in temperature and more effectively suppress an excessive temperature rise in transmission oil.

Further, in the present invention, preferably, the second heat exchanger of the oil flow path is located inside the engine compartment of the vehicle having a grill for introducing running wind into the engine compartment, and is located near the tire house of the vehicle in a plan view of the vehicle. It is located on the front side.
According to the present invention configured in this way, since the traveling wind flowing into the engine room from the grill of the vehicle basically goes toward the tire house side, the traveling wind easily hits the second heat exchanger. , it is possible to more effectively suppress the temperature of the second heat exchanger for cooling the transmission oil from increasing.

Further, in the present invention, preferably, when the temperature of the oil is below a predetermined temperature, the oil flow rate adjusting device is configured to adjust the oil flow rate flowing through the first oil flow path to be lower than the oil flow rate flowing through the second oil flow path. In addition, the oil flow rate flowing through the second oil flow path is configured to be larger when the oil temperature exceeds a predetermined temperature than when the oil temperature is below the predetermined temperature.
According to the present invention configured in this manner, the oil flow rate regulating device (for example, a solenoid valve) more effectively raises the temperature of the transmission oil early to reduce driving resistance and prevent excessive temperature rise. This makes it possible to suppress poor lubrication within the transmission.

Further, in the present invention, preferably, the oil flow rate regulating device causes the oil to flow only through the first oil flow path when the oil temperature is below a predetermined temperature, and when the oil temperature exceeds the predetermined temperature. is configured to allow oil to flow through both the first oil flow path and the second oil flow path .
According to the present invention configured in this manner, when the oil temperature is low, below a predetermined temperature, the oil flow rate adjusting device (for example, a 2-way valve such as a thermostat) causes the oil to flow into the first cooling water, which has a relatively high temperature. When the oil temperature exceeds a predetermined temperature, the oil flows only through the first heat exchanger that exchanges heat with the first heat exchanger. Since the oil can be switched to flow through both the first oil flow path and the second oil flow path to flow through the two heat exchangers, the temperature of the transmission oil can be raised more effectively to drive the drive. In addition to reducing resistance, it is possible to suppress excessive temperature rise and prevent poor lubrication within the transmission.

According to the vehicle cooling device of the present invention, it is possible to quickly raise the temperature of the transmission oil to reduce driving resistance, and to suppress excessive temperature rise, thereby suppressing poor lubrication within the transmission.

1 is a plan view showing a schematic configuration of a power source and a power transmission device of a vehicle to which a vehicle cooling device according to a first embodiment of the present invention is applied. FIG. 1 is a front view showing a schematic arrangement of a radiator and a heat exchanger in an engine room of a vehicle equipped with a vehicle cooling device according to a first embodiment of the present invention. FIG. 1 is a plan view showing a schematic arrangement of a radiator and a heat exchanger in an engine room of a vehicle equipped with a vehicle cooling device according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a schematic configuration of a cooling water and oil heat exchange circuit of a vehicle cooling device according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating an example of the concept of oil flow rate adjustment by the oil flow rate adjustment device of the vehicle cooling device according to the first embodiment of the present invention. FIG. 2 is a plan view showing a schematic configuration of a power source and a power transmission device of a vehicle to which a vehicle cooling device according to a second embodiment of the present invention is applied. It is a schematic diagram which shows the schematic structure of the cooling water and oil heat exchange circuit of the vehicle cooling device by 2nd Embodiment of this invention. FIG. 7 is a diagram illustrating an example of the concept of adjusting the oil flow rate by the oil flow rate adjustment device of the vehicle cooling device according to the second embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle cooling device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

First, with reference to FIGS. 1 to 3, a schematic configuration of a power transmission system of a vehicle to which a vehicle cooling device according to a first embodiment of the present invention is applied will be described. FIG. 1 is a plan view showing a schematic configuration of a power source and a power transmission device of a vehicle to which a vehicle cooling device according to a first embodiment of the present invention is applied, and FIG. 2 is a plan view showing a schematic configuration of a power source and a power transmission device according to a first embodiment of the present invention. FIG. 3 is a front view showing a schematic arrangement of a radiator and a heat exchanger in the engine compartment of a vehicle equipped with a vehicle cooling system, and FIG. FIG. 2 is a plan view showing a schematic arrangement of a radiator and a heat exchanger in an engine room.

As shown in FIG. 1, a power transmission system 2 of a vehicle to which a vehicle cooling device 1 according to a first embodiment of the present invention is applied includes an engine 4 and a motor 6 that are power sources, and a transmission that is a power transmission device. (transmission) 8. In this embodiment, the engine 4 is a six-cylinder longitudinally-mounted multi-cylinder engine, but it may be an engine with another number of cylinders, such as four cylinders.

The vehicle according to the present embodiment is a rear wheel drive vehicle (FR) in which a motor 6 is provided between an engine 4 and a transmission 8. It's a transmission. The power of the engine 4 and/or the motor 6 is transmitted to the transmission 8, and the power is transmitted to rear wheels (not shown) via a propeller shaft, a differential device (not shown), or the like. The transmission 8 is an automatic transmission, but may be a manual transmission. As a modification, the vehicle cooling device 1 according to the embodiment of the present invention can also be applied to a front wheel drive vehicle having a power transmission system of a horizontally mounted engine or a horizontally mounted transmission (not shown).

Next, as shown in FIG. 1, the engine 4 of the power transmission system 2 according to the present embodiment includes a supercharger (turbocharger) 10, an intake air (fresh air), and an interface for cooling intake gas including EGR gas. It includes a cooler 12 and an EGR device 14 that circulates exhaust gas to the intake side. In this embodiment, the supercharger 10 is a turbocharger that uses exhaust pressure, but it may also be an electric turbocharger or a mechanical supercharger.

Further, a DCDC converter (voltage converter/transformer) 16 and an inverter 18, which are high voltage components for operating the motor 6, are connected to the motor 6 of the power transmission system 2 according to the present embodiment. The voltage components 16 and 18 constitute a motor drive device.

On the vehicle front side of the engine 4 and motor 6, there is an air-cooled radiator (HT radiator) 20 (hereinafter referred to as a first radiator) for high-temperature cooling water that cools the cooling water that flows through the engine 4 and cools the engine 4 with the running wind. and low-temperature cooling water that is provided on the vehicle front side of the first radiator 20 and that flows through the DCDC converter 16, inverter 18, motor 6, and intercooler 12, and cools the cooling water that cools them with the running wind. An air cooling radiator (LT radiator) (hereinafter referred to as a second radiator) 22 is provided. Each radiator 20, 22 is a heat exchanger that exchanges heat between the running wind and cooling water.

Further, as shown in FIG. 1, the engine 4 is equipped with a first heat exchanger 24 (Automatic Transmission Fluid/Warmer-Cooler) that exchanges heat between engine cooling water and transmission oil, which will be described later. An air-cooled second heat exchanger (Automatic Transmission Fluid/Warmer-Cooler) 27 that exchanges heat with the running wind is attached to each of 6.

Here, as shown in FIG. 2, in the engine compartment 3 of the vehicle in which the vehicle cooling device 1 is installed, there is a rear grille 5 behind a front grill 5 for introducing running wind into the engine compartment 3, as seen from the front of the vehicle. A first radiator 20 is provided on the side. Further, as shown in FIG. 2, a second heat exchanger 27 is provided at a position on one side in the vehicle width direction with respect to the first radiator 20 so as not to overlap with the first radiator 20 when viewed from the front of the vehicle. There is.

Further, as shown in FIG. 3, the first radiator 20 is provided at a position behind the front grille 5 in the engine compartment 3 when the vehicle is viewed from above. Further, as shown in FIG. 3, the second heat exchanger 27 is provided at a position on one side in the vehicle width direction with respect to the first radiator 20 so as not to overlap with the first radiator 20 when the vehicle is viewed from above. ing. Further, the second heat exchanger 27 is provided at a position in front of the tire house 7 on one side in the vehicle width direction of the engine room 3 in a plan view of the vehicle.

In this embodiment, such an arrangement makes it difficult for the second heat exchanger 27 to receive the traveling wind warmed by the heat of the radiator 20. Furthermore, most of the wind flowing into the engine compartment 3 from the front grille 5 is directed toward the tire house 7, so that the wind is more likely to hit the second heat exchanger 27.

Next, referring to FIGS. 4 and 5, a schematic configuration of a circuit for heat exchange between cooling water and oil, including a cooling water flow path, an oil flow path, and a heat exchanger, of the vehicle cooling device according to the first embodiment of the present invention is shown. Explain. FIG. 4 is a schematic diagram showing a schematic configuration of a cooling water and oil heat exchange circuit of a vehicle cooling system according to the first embodiment of the present invention, and FIG. FIG. 3 is a diagram illustrating an example of the concept of adjusting the oil flow rate by the oil flow rate adjustment device of the cooling device.
First, as shown in FIG. 4, the vehicle cooling device 1 according to the first embodiment of the present invention includes an engine cooling water flow path (hereinafter referred to as a first cooling water flow path) 30, a motor drive device cooling water flow path (hereinafter referred to as a first cooling water flow path) , a second cooling water flow path) 32, and a transmission oil flow path (hereinafter referred to as an oil flow path) 34.

The first cooling water flow path 30 is a flow path through which the engine 4 and the oil cooler (OC) 28 that cools the engine oil in the engine 4 flow, and the cooling water that cools them flows.
The second cooling water flow path 32 flows through the DC/DC converter (DCDC) 16, the inverter (INV) 18, the motor (Motor) 6, and the intercooler (I/C) 12, and the cooling water that cools them flows. It is a flow path.
The oil flow path 34 is a flow path through which transmission oil that lubricates the inside of the transmission (TM) 8 flows.

The first cooling water flow path 30 will be explained in more detail.
The first cooling water passage 30 is provided with a water pump 40 for circulating cooling water within the first cooling water passage 30 .
The first cooling water flow path 30 has two branched flow paths. The first cooling water flow path 30 first includes a first flow path 30a through which cooling water flows through the water pump 40, the engine 4, the first radiator 20, and a thermostat (T/S) 42 as a temperature regulator of the cooling water. have The thermostat 42 is a valve that opens when the coolant flowing through the engine 4 is so high that it must be cooled by the radiator 20, allowing the coolant to flow through the radiator 20.

The first coolant flow path 30 further includes a second flow path 30b through which the coolant flows through the water pump 40, the first heat exchanger 24, the oil cooler 28, and the engine 4 in this order. The first heat exchanger 24 exchanges heat between the cooling water flowing through the second flow path 30b and the oil (transmission oil) flowing through the oil flow path 34.

Next, the second cooling water flow path 32 will be explained in more detail.
The second cooling water passage 32 is provided with a water pump 46 for circulating cooling water within the second cooling water passage 32 .
The second cooling water flow path 32 has two branched flow paths. The second cooling water passage 32 first has a first passage 32a through which cooling water flows through the water pump 46, the DCDC converter 16, the inverter 18, the second heat exchanger 27, and the motor 6 in this order. The second heat exchanger 27 is an air-cooled heat exchanger that exchanges heat with the running wind that has flowed into the engine room 3.

The second cooling water flow path 32 further branches from the first flow path 32a, and allows the cooling water to flow through a flow rate adjustment valve/coolant solenoid valve (Coolant Solenoid Valve) 48 that adjusts the flow rate of the cooling water, and the intercooler 12 in that order. , has a second flow path 32b that joins the first flow path 32a on the downstream side of the motor 6.

Next, the oil flow path 34 will be explained in more detail.
The transmission 8 is provided with an oil pump (not shown) for circulating oil within the transmission 8 and within the oil flow path 34. The oil pump (not shown) is a known oil pump that supplies transmission oil as lubricating oil/operating oil to power transmission components (gears, clutches, etc.) in the transmission 8.

The oil flow path 34 has two branched flow paths. The oil flow path 34 first has a first flow path 34 a that circulates between the transmission 8 and the first heat exchanger 24 . This first flow path 34a is also a flow path that bypasses the second heat exchanger 26.
The oil flow path 34 further branches from the first flow path 34a at a branch portion 34c, and circulates the oil that has passed through the transmission 8 and the first heat exchanger 24 to the second heat exchanger 27. 2 has a second flow path 34b that circulates from the heat exchanger 27 to the transmission 8.

Further, the oil flow path 34 is provided with an oil temperature sensor (SN) 50 that detects the temperature of the oil. This oil temperature sensor 50 may be provided at any position within the oil flow path 34 as long as it can detect the temperature of the oil itself.
Further, the second flow path 34b of the oil flow path 34 is provided with a solenoid valve device (SV) 52 that adjusts the flow rate of oil flowing to the second heat exchanger 27. This solenoid valve device 52 is an electromagnetic solenoid valve, and the opening degree of the valve can be adjusted by changing the duty ratio through on-off control.
In this embodiment, the opening degree of the valve of the solenoid valve device 52 is adjusted according to the oil temperature detected by the oil temperature sensor 50, and the oil flow rate (first oil flow rate) flowing through the first heat exchanger 24 is adjusted. The solenoid valve device 52 is configured so that the oil flow rate (second oil flow rate) flowing through the second heat exchanger 27 can be adjusted.

For example, as shown in FIG. 5 as an example of the flow rate adjustment concept, the solenoid valve device 52 causes the first oil flow rate to be larger than the second oil flow rate when the oil temperature is below a predetermined temperature A (for example, 80° C.). You can do it like this. Further, the second oil flow rate when the predetermined temperature A is exceeded can be made larger than the second oil flow rate when the predetermined temperature A is lower than the predetermined temperature A. In the example shown in FIG. 3, the first oil flow rate is adjusted to be larger than the predetermined flow rate B, and the second oil flow rate is adjusted to be smaller than the predetermined flow rate B.
The predetermined temperature A is set to a temperature that can quickly raise the temperature of the oil to reduce the drive resistance of the transmission 8 and suppress an excessive rise in oil temperature.

Next, a vehicle cooling device according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8. FIG. 6 is a plan view showing a schematic configuration of a power source and a power transmission device of a vehicle to which a vehicle cooling device according to a second embodiment of the present invention is applied, and FIG. 7 is a plan view showing a schematic configuration of a power source and a power transmission device according to a second embodiment of the present invention. FIG. 8 is a schematic diagram showing a schematic configuration of a heat exchange circuit for cooling water and oil in a vehicle cooling device, and FIG. 8 is a diagram illustrating the adjustment of oil flow rate by the oil flow rate adjustment device of the vehicle cooling device according to the second embodiment of the present invention. FIG. 2 is a diagram illustrating an example of the concept.
Below, configurations that are different from the first embodiment will be mainly described. Regarding each configuration of the second embodiment, the same components are given the same reference numerals except for differences in arrangement relationship.

First, as shown in FIG. 6, a power transmission system 102 of a vehicle to which a vehicle cooling device 100 according to a second embodiment of the present invention is applied has an engine 4 that is a power source, similar to the first embodiment described above. and a motor 6, a transmission 8, a supercharger 10, an intercooler 12, an EGR device 14, a DCDC converter 16, an inverter 18, an air cooling radiator for high temperature cooling water (first radiator) 20, and a low temperature It includes a cooling water air cooling radiator (second radiator) 22, a first heat exchanger 24, and a second heat exchanger 27.
The arrangement of the first radiator 20 and the second heat exchanger 27 in the second embodiment is the same as in the first embodiment described above (see FIGS. 2 and 3).

In this second embodiment, as shown in FIG. 6, the motor 6 is not arranged between the engine 4 and the transmission 8, but is arranged in parallel with the engine 4 in the vehicle width direction. In this second embodiment, a power transmission belt 5 is provided that connects a motor pulley 6b provided on an output shaft 6a of the motor and a crank pulley 4b provided on a crankshaft 4a of an engine 4, and the driving force of the motor 6 is is transmitted to the crankshaft 4a of the engine 4 via the belt 5. Power from the engine 4 and/or motor 6 is transmitted to the transmission 8 .

Next, as shown in FIG. 7, the vehicle cooling device 100 according to the second embodiment of the present invention has the engine 4 and the oil cooler 28 flowing through each other, similarly to the first embodiment described above. A motor through which cooling water flows through an engine cooling water flow path (first cooling water flow path) 30, a DCDC converter 16, an inverter 18, a motor 6, and an intercooler 12, and through which cooling water flows. There are mainly three flow paths/circuits: a drive device cooling water flow path (second cooling water flow path) 32 and a transmission oil flow path (oil flow path) 34 through which transmission oil that lubricates the inside of the transmission 8 flows. Equipped with.

The first cooling water flow path 30 is configured similarly to the first embodiment described above. That is, the first cooling water flow path 30 is provided with a water pump 40 and has two branched flow paths. The first flow path 30a of the first coolant flow path 30 is a flow path through which cooling water flows through the water pump 40, the engine 4, the first radiator 20, and the thermostat 42 in this order. The passage 30b is a passage through which cooling water flows through the water pump 40, the first heat exchanger 24, the oil cooler 28, and the engine 4 in this order.

The second cooling water flow path 32 is configured similarly to the first embodiment described above. That is, the second cooling water flow path 32 is provided with a water pump 46 and has two branched flow paths. The first flow path 32a of the second cooling water flow path 32 is a flow path through which cooling water flows through the water pump 46, the DCDC converter 16, the inverter 18, the second heat exchanger 27, and the motor 6 in this order. 32b is a flow that branches from the first flow path 32a, flows the cooling water in this order through a flow rate adjustment valve 48 that adjusts the flow rate of the cooling water, and the intercooler 12, and joins the first flow path 32a on the downstream side of the motor 6. It is a road.

The oil flow path 34 according to the second embodiment is circulated between the transmission 8 and the first heat exchanger 24 by an oil pump (not shown) provided in the transmission 8, as in the first embodiment described above. a first flow path 34a; a second flow path 34b that branches from the first flow path 34a and circulates the oil that has passed through the transmission 8 and the first heat exchanger 24 to the second heat exchanger 27; has.
The oil flow path 34 according to the second embodiment is provided with a 2WAY valve (2Way-V) 54 instead of the solenoid valve device 52 of the first embodiment.
More specifically, in the oil flow path 34, a branch portion 34c where the second flow path 34b branches from the first flow path 34a includes oil flowing through the first flow path 34a and oil flowing through the second flow path 34b. A 2WAY valve (2Way-V) 54 is provided to completely separate the two. The 2WAY valve 54 of the second embodiment is a so-called thermostat, and opens and closes depending on the oil temperature in the oil flow path 34 to adjust the oil flow rate (first oil flow rate) flowing through the first heat exchanger 24 and the second The oil flow rate (second oil flow rate) flowing through the heat exchanger 27 is configured to be adjustable.

For example, as shown in FIG. 8 as an example of the flow rate adjustment concept, when the oil temperature is below a predetermined temperature C (for example, 80° C.), the 2WAY valve 54 is set so that the oil flows only to the first heat exchanger 24. On the other hand, when the oil temperature exceeds a predetermined temperature C, the 2WAY valve 54 is opened so that oil flows through both the first heat exchanger 24 and the second heat exchanger 27. The predetermined temperature C is set to a temperature that can quickly raise the temperature of the oil to reduce the drive resistance of the transmission 8 and suppress an excessive rise in oil temperature.

Note that the power transmission system (102) of the vehicle of this second embodiment is the power transmission system 2 of the vehicle of the first embodiment described above, and in this power transmission system 2, the power transmission system (102) including the two-way valve 54 as described above. The circuit of the second embodiment may also be used. Similarly, the power transmission system (2) of the vehicle of the first embodiment described above is replaced with the power transmission system 102 of the vehicle of the second embodiment, and in this power transmission system 102, as described above, the solenoid valve 52 is The circuit of one embodiment may be configured.

Next, the main effects of the vehicle cooling device according to the embodiment of the present invention will be explained.
First, in the vehicle cooling devices 1 and 100 according to the first and second embodiments of the present invention, the oil flow path 34 has heat generated between the cooling water in the cooling water flow path 30 and the oil in the oil flow path 34. The first heat exchanger 24 performs heat exchange, the second heat exchanger 27 performs heat exchange between the running wind received by the vehicle and the oil in the oil flow path 34, and the oil flow rate flowing through the first heat exchanger 24. Oil flow rate adjusting devices 52 and 54 (solenoid valves, 2-way valves) that can adjust the flow rate of oil flowing through the second heat exchanger 26 are provided.
With this configuration, the first heat exchanger 24 can quickly raise the temperature of the transmission oil using the high-temperature cooling water received from the engine 4, and the second heat exchanger 27 can quickly raise the temperature of the transmission oil after the temperature has been raised. transmission oil can be cooled by the wind from the vehicle. Therefore, the oil flow rate adjusting devices 52 and 54 adjust the oil flow rate flowing through the first heat exchanger 24 and the oil flow rate flowing through the second heat exchanger 27 according to the degree of rise in the temperature of the transmission oil. By doing so, it is possible to quickly raise the temperature of the transmission oil to reduce the drive resistance of the transmission 8, and also to suppress excessive temperature rise and prevent poor lubrication within the transmission 8.

Further, according to the first and second embodiments, the second heat exchanger 27 of the oil flow path 34 is provided at a position that does not overlap with the first radiator 20 when viewed from the front of the vehicle. 27 is less likely to receive the traveling wind warmed by the heat of the radiator 20, and as a result, it is possible to suppress the temperature of the second heat exchanger 27 for cooling the transmission oil from increasing.
Further, according to the first and second embodiments, the second heat exchanger 27 of the oil flow path is installed in the engine compartment 3 of the vehicle, which has the grille 5 for introducing running wind into the engine compartment 3. Since it is provided on the front side of the vehicle's tire house 7 in a plan view, the running wind that flows into the engine room from the vehicle grille and heads toward the tire house side easily hits the second heat exchanger 27. , it is possible to suppress the temperature of the second heat exchanger 27 for cooling the transmission oil from increasing.

Further, according to the first embodiment, when the temperature of the oil in the transmission 8 is below a predetermined temperature (for example, temperature A shown in FIG. 3), the solenoid valve device 52, which is an oil flow rate adjustment device, Since the oil flow rate flowing through the heat exchanger 24 is configured to be larger than the oil flow rate flowing through the second heat exchanger 26, the oil flow rate adjustment device 52 can more effectively control the oil in the transmission 8 at an early stage. The driving resistance can be reduced by raising the temperature.
Further, according to the first embodiment, the solenoid valve device 52, which is an oil flow rate adjustment device, adjusts the oil flow rate flowing through the second heat exchanger 24 so that the temperature of the oil in the transmission 8 is a predetermined temperature (for example, in FIG. When the temperature exceeds the indicated temperature A), it is configured to be higher than when the temperature is below the predetermined temperature. It is possible to suppress the rise and suppress poor lubrication within the transmission 8.

Further, according to the second embodiment, when the oil temperature of the transmission 8 is lower than or equal to a predetermined temperature (for example, temperature C shown in FIG. 6), the 2WAY valve 54, which is an oil flow rate adjustment device, controls the oil to a relatively low temperature. When the oil temperature exceeds a predetermined temperature, the oil flows through the second heat exchanger 26 where the temperature is relatively low. Since the oil can be switched to flow, it is possible to more effectively raise the temperature of the oil in the transmission 8 at an early stage to reduce driving resistance, as well as suppress excessive temperature rise and prevent poor lubrication within the transmission 8. be able to.

1, 100 Vehicle cooling system 2, 102 Power transmission system 3 Engine room 4 Engine 5 Front grill (grill)
6 Motor (motor drive device)
7 Front wheel tire house 8 Transmission 10 Supercharger 12 Intercooler 14 EGR device 16 DCDC converter (high voltage parts, motor drive device)
18 Inverter (high voltage parts, motor drive device)
20 Engine cooling water radiator 20 Engine cooling water radiator (first radiator)
22 Radiator for motor drive device (second radiator)
24 First heat exchanger 27 Second heat exchanger/air-cooled heat exchanger 30 Engine cooling water flow path (first cooling water flow path)
30a First flow path 30b of engine cooling water flow path 32b Second flow path 32 of engine cooling water flow path Cooling water flow path for motor drive device (second cooling water flow path)
32a First flow path 32b of the cooling water flow path for the motor drive device First flow path 34 of the cooling water flow path for the motor drive device Transmission oil flow path 34a First flow path 34b of the transmission oil flow path Transmission oil Second flow path 48 Flow rate adjustment valve/coolant solenoid valve 50 Oil temperature sensor 52 Solenoid valve (oil flow rate adjustment device)
54 2WAY valve (oil flow adjustment device)

Claims (7)

A cooling water flow path through which cooling water for cooling the engine flows;
Equipped with an oil flow path through which oil lubricates the inside of the transmission,
The oil flow path is configured to perform heat exchange between the cooling water in the cooling water flow path and the oil in the oil flow path, and to operate the transmission regardless of the temperature of the oil during circulation of the oil in the oil flow path. a first heat exchanger through which the entire amount of oil that has come out flows ; a second heat exchanger that exchanges heat between the running wind received by the vehicle and the oil in the oil flow path; and a second heat exchanger downstream from the first heat exchanger. a first oil flow path that branches at a side and bypasses the second heat exchanger to circulate oil to the transmission; and a first oil flow path that branches at a downstream side of the first heat exchanger and a second oil flow path that circulates oil to the transmission through a second heat exchanger; and a second oil flow path that circulates oil to the transmission through a second heat exchanger; A cooling device for a vehicle, comprising: an oil flow rate adjusting device capable of adjusting the oil flow rate flowing through the oil flow path and the oil flow rate flowing through the second oil flow path. A cooling water flow path through which cooling water for cooling the engine flows;
Equipped with an oil flow path through which oil lubricates the inside of the transmission,
The oil flow path includes a first heat exchanger that exchanges heat between the cooling water in the cooling water flow path and the oil in the oil flow path, and a first heat exchanger that performs heat exchange between the cooling water in the cooling water flow path and the oil in the oil flow path, and a first heat exchanger that exchanges heat between the running wind received by the vehicle and the oil in the oil flow path. a second heat exchanger that exchanges heat between the first and second heat exchangers, and a first heat exchanger that is branched downstream from the first heat exchanger and that bypasses the second heat exchanger and circulates oil to the transmission. an oil flow path; a second oil flow path that branches downstream from the first heat exchanger and circulates oil through the second heat exchanger to the transmission; The oil leaving the first heat exchanger is made to flow through both the first oil flow path and the second oil flow path while keeping the flow rate of the oil flowing through the heat exchanger constant , and A cooling device for a vehicle, comprising: an oil flow rate adjustment device capable of adjusting the oil flow rate flowing through the oil flow path and the oil flow rate flowing through the second oil flow path. A cooling water flow path through which cooling water for cooling the engine flows;
Equipped with an oil flow path through which oil lubricates the inside of the transmission,
The oil flow path includes a first heat exchanger that exchanges heat between the cooling water in the cooling water flow path and the oil in the oil flow path, and a first heat exchanger that performs heat exchange between the cooling water in the cooling water flow path and the oil in the oil flow path, and a first heat exchanger that exchanges heat between the running wind received by the vehicle and the oil in the oil flow path. a second heat exchanger that exchanges heat between the first and second heat exchangers, and a first heat exchanger that is branched downstream from the first heat exchanger and that bypasses the second heat exchanger and circulates oil to the transmission. an oil flow path; a second oil flow path that branches downstream from the first heat exchanger and circulates oil through the second heat exchanger to the transmission; an oil flow rate adjusting device capable of adjusting the oil flow rate flowing through the first oil flow path and the oil flow rate flowing through the second oil flow path while keeping the flow rate of oil flowing through the heat exchanger constant; A cooling device for a vehicle , characterized in that the oil flow rate adjusting device is not provided in the first oil flow path . Furthermore, a radiator for cooling the cooling water provided in the cooling water flow path is provided,
4. The vehicle cooling device according to claim 1, wherein the second heat exchanger of the oil flow path is provided at a position that does not overlap with the radiator when viewed from the front of the vehicle. The second heat exchanger of the oil flow path is provided in the engine compartment of the vehicle having a grill for introducing running wind into the engine compartment, and on the front side of the tire house of the vehicle when viewed from the top of the vehicle. The vehicle cooling device according to claim 4 . The oil flow rate adjusting device is configured to make the oil flow rate flowing through the first oil flow path larger than the oil flow rate flowing through the second oil flow path when the temperature of the oil is below a predetermined temperature, and Any one of claims 1 to 5 , wherein the oil flow rate flowing through the second oil flow path is configured to be larger when the temperature of the oil exceeds the predetermined temperature than when the oil temperature is below the predetermined temperature. The vehicle cooling device according to item 1. The oil flow rate regulating device causes the oil to flow only through the first oil flow path when the temperature of the oil is below a predetermined temperature, and causes the oil to flow through the first oil flow path only when the temperature of the oil exceeds the predetermined temperature. The vehicle cooling device according to any one of claims 1 to 5 , configured to allow oil to flow through both the first oil flow path and the second oil flow path.

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