JP2003314673A - Oil heater for vehicular automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil heater for an automatic transmission heating oil without directly using an exhaust pipe of an engine. <P>SOLUTION: Air led from an opening of a suction pipe 30 is heated by heat from the exhaust pipe 26 in a heat exchanger 28. The air heated by the heat exchanger 28 is made to flow into a warm wind flowing pipe 32 penetrating an oil pan 22 of the automatic transmission 14. In this way, oil is promptly warmed by the air flowing in the warm wind flowing pipe 32, so that the viscosity of the oil is promptly lowered, and a friction loss at an operating part in the automatic transmission is decreased. Therefore, fuel consumption can be improved. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil heating device for heating oil of an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art As an automatic transmission for a vehicle, there is known an automatic transmission of a type including a torque converter, a planetary gear forming a gear ratio, and a hydraulic friction engagement device for switching gears. . In this type of automatic transmission,
Oil, that is, automatic transmission fluid (ATF) is used as hydraulic oil for torque converters, lubricating oil for bearings, hydraulic oil for hydraulic control systems, and lubricating oil for hydraulic friction engagement devices.

When the temperature of the oil is low, the viscosity of the oil becomes high, so that the friction loss in the moving portion in the automatic transmission increases, and the fuel consumption deteriorates. Therefore, there has been proposed a device for heating oil when the oil temperature is low such as when the engine is started. For example, Actual Kaihei 1-87
In the device described in Japanese Patent No. 056, a heat exchanger is arranged in a housing of an automatic transmission, an exhaust pipe is connected to the heat exchanger, and exhaust gas from an engine is introduced into the heat exchanger. Is heating the oil. Also, the actual exploitation 63
In the device described in Japanese Patent No. 2825, in addition to an oil passage communicated with an oil cooler for cooling oil, an oil passage branched from the oil passage and partially wound around an exhaust pipe is provided. When the temperature of the oil is low, the oil is guided to the oil passage wound around the exhaust pipe, and the oil is heated by the heat of the exhaust gas.

[0004]

However, when the oil is directly heated by using the exhaust pipe as in the device described in the above publication, the oil existing around the exhaust pipe becomes locally too hot, Oil life may be reduced.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an oil warming device for an automatic transmission that heats oil without directly using an exhaust pipe. is there.

[0006]

The present invention for achieving the above object includes a heat exchanger for introducing air to heat the air by the heat of an exhaust pipe from an engine, and the heat exchanger heats the air. It is an oil warming device for an automatic transmission for a vehicle, which heats oil in the automatic transmission with the generated air.

[0007]

According to the present invention, the heat of the exhaust pipe heats the air, and the heated air heats the oil of the automatic transmission. Therefore, when the oil temperature is low, the fuel consumption can be improved by heating the oil with the air heated by the heat of the exhaust pipe.

[0008]

Other Embodiments of the Invention Here, preferably, in the oil warming device, one end is connected to the heat exchanger, and a part is arranged in an oil pan of the automatic transmission. Is equipped with. With this configuration, the air heated by the heat exchanger flows through the warm air flow pipe arranged in the oil pan, so that the oil in the oil pan is warmed. Therefore, the entire oil is warmed up quickly.

Further, preferably, the oil warming device is provided with a warm air flow pipe having one end connected to the heat exchanger and the other end opening toward the automatic transmission. By doing so, the air heated by the heat exchanger is blown to the automatic transmission, so that the oil in the automatic transmission is also warmed.

Further, preferably, the oil heating device is an oil temperature sensor for detecting an oil temperature of the automatic transmission, and an oil temperature detected by the oil temperature sensor is a temperature requiring heating. In this case, it further includes a heating control device for heating the oil of the automatic transmission with the air heated by the heat exchanger. In this way, the heating control device determines whether or not the oil needs to be heated from the oil temperature detected by the oil temperature sensor, and when it is necessary to heat the oil, automatically, The oil is heated by the air heated in the heat exchanger.

By the way, when a sufficient time elapses after the engine is started, the temperature of the oil in the automatic transmission rises due to frictional heat generation and requires cooling. Therefore, in a general automatic transmission, the oil is cooled by an oil cooler. Is introduced into the oil cooler and is cooled by the engine cooling water in the oil cooler. However, at the beginning of engine starting, the temperature of the oil is not high enough to be cooled, but is cooled by the cooling water, which hinders the rapid temperature increase of the oil. Therefore, the oil temperature of the automatic transmission can be quickly raised even in the following manner.

That is, the oil temperature can be raised early by not cooling the oil used in the torque converter which warms up relatively early in the automatic transmission due to internal frictional heat. In this way, the oil warming device of the type that warms the oil early by not cooling the oil warmed by the torque converter branches off from the cooling pipe that introduces the oil of the oil converter to the oil cooler, The return pipe for returning to the automatic transmission without passing through the oil cooler, and when the oil temperature is lower than a predetermined temperature set lower than the temperature requiring cooling, the oil passage of the oil is returned to the return pipe. It is an oil heating device including a first oil passage switching device for switching. According to this oil warming device, when the oil temperature is equal to or lower than the predetermined temperature, the oil passage of the oil is switched to the return pipe by the first oil passage switching device, so that the torque converter warms up relatively early. Since the oil to be collected is returned to the automatic transmission as it is, the oil temperature can be quickly raised.

The return pipe preferably supplies oil to a friction engagement portion of the automatic transmission. With this configuration, the oil warmed relatively early by the torque converter is supplied to the friction engagement portion.
Here, the friction engagement portion refers to a clutch and a brake,
Among the friction loss generated in the automatic transmission when the oil temperature is low, the drag resistance (friction loss) generated by the friction engagement portion most affects the deterioration of fuel efficiency. That is,
Since the friction engagement portion is a heating required portion that needs to be heated quickly, when the oil warmed relatively early by the torque converter is supplied to the friction engagement portion in this manner,
Fuel efficiency can be improved efficiently.

The following oil warming device can be used as an oil warming device of a type that quickly warms the friction engaging part in order to reduce drag resistance in the friction engaging part and improve fuel efficiency. . That is, the oil heating device branches from a cooling pipe that supplies oil cooled by an oil cooler to an oil pan of an automatic transmission, and supplies oil to a friction engagement portion of the automatic transmission. And when the oil temperature is within a predetermined warmable temperature range as a temperature range in which the oil is heated by the engine cooling water in the oil cooler, the oil passage of the oil is switched to the heating pipe. It is an oil heating device including an oil passage switching device. According to this oil heating device,
When the oil is warmed by the engine cooling water in the oil cooler, the warmed oil is directly supplied to the friction engagement portion, so that the drag resistance at the friction engagement portion can be reduced early.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show the first
It is a figure which shows schematic structure of the oil heating apparatus 10 of embodiment, FIG. 1 is a top view, FIG. 2 is a side view.

In FIGS. 1 and 2, reference numeral 12 is an engine, which is arranged in parallel with the front-rear direction of the vehicle. An automatic transmission 14 is arranged behind the engine 12.
The automatic transmission 14 includes a torque converter 16 connected to the power shaft of the engine 12, a wet multi-plate clutch and a wet multi-plate brake that constrain the movement of the planetary gear mechanism and each element of the planetary gear mechanism, and the torque converter 16 includes the torque converter 16. A transmission portion 18 that changes the rotational speed of the output shaft 16 and transmits the rotation speed to the differential gear device, and disengagement of a friction engagement device (that is, a wet multi-disc clutch and a wet multi-disc brake) of the transmission portion 18. And a hydraulic control unit 20 for controlling the. Below the hydraulic control unit 20, a fluid that mediates power transmission of the torque converter 16, a fluid that is supplied to the friction engagement device of the transmission unit 18, an oil used as hydraulic oil of the hydraulic control unit 20, and the like (automatic). An oil pan 22 for accommodating a transmission fluid (ATF) is provided.

An intake pipe 24 is connected to one side surface of the engine 12 parallel to the vehicle front-rear direction, and an exhaust pipe 26 is connected to the opposite side surface thereof. The intake pipe 24 includes a branch pipe portion 24a and a single pipe portion 24b, and the exhaust pipe 26 also includes a branch pipe portion 26a and a single pipe portion 26b.

The oil heating device 10 includes a heat exchanger 28,
A suction pipe 30 for supplying air to the heat exchanger 28 and a hot air flow pipe 32 for circulating the air heated in the heat exchanger 28.
It has and.

The suction pipe 30 is substantially parallel to the longitudinal direction of the vehicle,
The tip is open to the front side of the vehicle, and when the vehicle moves forward, air is introduced through the opening. A lid 36 is attached to the opening at the tip of the suction pipe 30 so that the opening 36 can be opened and closed by being rotated about a rotation shaft 34. Further, one end of a spring 38 is attached to one end of the lid 36, and the other end of the spring 38 is fixed to a fixed portion of the vehicle. The lid 36 is biased by the spring 38 toward the side that closes the opening of the suction pipe 30.

Further, the lid 36 is rotated by the lid rotating device 40 to the side opposite to the side rotated by the urging force of the spring 38. The lid rotation device 40 includes an electromagnetic actuator 42 that is movable in parallel with the suction pipe 30.
And a slider 44 connected to the electromagnetic actuator 42,
Cylinder 4 for guiding the slider 44 in a direction parallel to the suction pipe 30
6 and a connecting member 48 that connects the slider 44 and the lid 36. When the electromagnetic actuator 42 is energized, the lid 3
6 is rotated to be in the state of the chain double-dashed line in FIG. 1, and it becomes possible to introduce air from the opening of the suction pipe 30.
On the other hand, when the electromagnetic actuator 42 is not energized or when a part of the circuit that supplies electricity to the electromagnetic actuator 42 is disconnected, the lid 36 is rotated by the urging force of the spring 38 and the suction pipe 30 is rotated. The opening is blocked.
Therefore, even if the electromagnetic actuator 42 is disconnected, the oil will not be overheated.

The heat exchanger 28 is a hollow columnar member arranged in parallel with the suction pipe 30, and the single pipe portion 26b of the exhaust pipe 26.
Of the vehicle, which covers the upstream side of the transmission section 18 in the vehicle front-rear direction. Further, since the upstream end of the heat exchanger 28 (the end portion on the front side of the vehicle) is connected to the suction pipe 30, the air sucked from the opening of the suction pipe 30 receives the heat exchanger 2.
8 and is heated by heat from the exhaust pipe 26 in the heat exchanger 28.

The warm air flow pipe 32 is parallel to the width direction of the vehicle and has one end connected to the downstream end of the heat exchanger 28 and the other end positioned below the torque converter 16.
Connected to the distribution pipe 32a and the first distribution pipe portion 32a,
The second circulation pipe portion 32b penetrates the oil pan 22 in parallel with the vehicle front-rear direction. Since the air heated in the heat exchanger 28 is circulated in the warm air flow pipe 32, the oil contained in the oil pan 22 is warmed by the heated air.

The oil temperature sensor 50 is provided in the oil pan 22.
It is provided inside or in a circulation path between the oil pan 22 and an oil cooler (not shown), detects the oil temperature, and outputs an oil temperature signal indicating the temperature to the electronic control unit 52.

The electronic control unit 52 includes an oil temperature sensor 5
The oil temperature is determined based on the oil temperature signal supplied from 0, and when the determined oil temperature is equal to or lower than the determination reference temperature preset as the upper limit value of the temperature range required for heating, the lid rotation is performed. The electromagnetic actuator 42 of the moving device 40 is energized to bring the lid 36 into the state of the two-dot chain line in FIG. When the vehicle moves forward in this state, air is introduced from the opening of the suction pipe 30, and the air is introduced into the heat exchanger 28 through the exhaust pipe 2
It is heated by the heat from 6. Then, the heated air is circulated through the warm air flow pipe 32, so that the oil in the oil pan 22 is heated. In this way, when the oil is heated and the oil temperature detected by the oil temperature sensor 50 becomes equal to or higher than the determination reference temperature, the electronic control unit 52 causes the electronic actuator 42 of the lid rotating device 40 to move. Stop energizing. When the energization of the electronic actuator 42 is stopped, the lid 36 is closed by the urging force of the spring 38, so that the heating of the oil is also stopped. Since the heating of the oil is controlled in this way, the lid 36,
The lid rotation device 40 and the electronic control device 52 function as a heating control device.

According to the above embodiment, the heat of the exhaust pipe 26 heats the air, and the heated air heats the oil of the automatic transmission 14. Therefore, when the oil temperature is low, the fuel consumption can be improved by heating the oil with the air heated by the heat of the exhaust pipe 26.

In the above embodiment, the electronic control unit 52 determines the necessity of heating the oil based on the oil temperature detected by the oil temperature sensor 50.
If it is necessary to heat the oil, the electronic control unit 5
The lid rotating device 40 controlled by 2 rotates the lid 36, and the air heated by the heat exchanger 28 automatically warms the oil.

Next, a second embodiment of the present invention will be described. In the following description, parts having the same configurations as those of the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

FIG. 3 shows an oil heating device 1 according to the first embodiment.
FIG. 2 is a schematic configuration diagram of a vehicle drive device including an oil heating device 60 different from 0.

In FIG. 3, the cooling water pipe 62 is provided from the engine 12 to the radiator 64 and from the radiator 64 to the engine 12, and the cooling water that has cooled the engine 12 flows in the cooling water pipe 62 and the radiator 6 is cooled.
The cooling water supplied to No. 4 and cooled in the radiator 64 flows through the cooling water pipe 62 and is supplied to the engine 12 again.

The first cooling pipe 66 is connected to the torque converter 1
The oil used in 6 is supplied to the oil cooler 68 that is provided integrally with the radiator 64. The first cooling pipe 6
In the middle of 6, a first oil passage switching valve 70 that functions as a first oil passage switching device is provided. One end of the return pipe 72 has the first cooling pipe 66 through the first oil passage switching valve 70.
It is connected to the. That is, the return pipe 72 is a pipe branched from the first cooling pipe 66. Further, the other end of the return pipe 72 is connected to the friction engagement portion 73 of the transmission unit 18.

The first oil passage switching valve 70 switches the oil passage of the oil from the torque converter 16 to the return pipe 72 side when the oil temperature is equal to or lower than the predetermined first temperature T1, so that the oil temperature becomes the first oil temperature. When the temperature exceeds one temperature T1, it is switched to the oil cooler 68 side. For example, a wax that is melted at the first temperature T1 is enclosed, and a valve that switches the flow path by melting and solidifying the wax, or A valve in which the flow path is switched at the first temperature T1 by the bimetal can be used. Here, the first temperature T1 is preset as a temperature at which the temperature of the engine cooling water becomes higher than the oil temperature and the oil can be heated by the engine cooling water.

When the oil temperature is equal to or lower than the first temperature T1, the oil passage is set to the return pipe 72 side by the first oil passage switching valve 70, so that the relatively warm oil warmed by the torque converter 16 is generated. Since it is directly supplied to the friction engagement portion 73 of the transmission unit 18, relatively warm oil is supplied to the clutch and brake of the friction engagement portion 73.

Further, a bypass pipe 76 for bypassing the first oil passage switching valve 70 is connected to the first cooling pipe 66, and the oil temperature is so high that cooling is necessary in the middle of the bypass pipe 76. A valve 78 is provided that opens when the temperature is high and closes when the temperature is low. Therefore, even if the first oil passage switching valve 70 fails, if the oil becomes hot enough to be cooled, the oil is sent to the oil cooler 68 via the bypass pipe 76.

The oil that has exchanged heat with the engine cooling water in the oil cooler 68 is returned to the oil pan 22 through the second cooling pipe 80. A second oil passage switching valve 82 is provided in the middle of the second cooling pipe 80. One end of the heating pipe 84 is connected to the second cooling pipe 80 via the second oil passage switching valve 82. That is, the heating pipe 84 is a pipe branched from the second cooling pipe 80. The other end of the heating pipe 84 is connected to the friction engagement portion 73 of the transmission unit 18.

The second oil passage switching valve 82 connects the oil passage from the oil cooler 68 with the oil temperature at the first temperature.
When the temperature is equal to or lower than a predetermined second temperature T2 higher than T1, it is switched to the heating pipe 84 side, and when the oil temperature exceeds the second temperature T2, it is switched to the oil pan 22 side. Similar to the first oil passage switching valve 70 described above, the passages are switched by wax or bimetal. Here, the second temperature T2 is a temperature at which the oil temperature becomes higher than the engine cooling water temperature and the oil is cooled in the oil cooler 68, or a temperature at which the transmission unit 18 needs to be cooled. The temperature range that is equal to or lower than the second temperature T2 and equal to or higher than the first temperature T1 is a warmable temperature range in which the engine cooling water can heat the oil.

As described above, since the first temperature T1 is set as the temperature at which the oil is heated by the engine cooling water, the oil passage is switched to the oil cooler 68 side by the first oil passage switching valve 70. Initially, the oil sent to the oil cooler 68 is heated by the engine cooling water. On the other hand, the second temperature T2 is set as a temperature at which the oil temperature becomes higher than the temperature of the engine cooling water, and when the oil temperature is equal to or lower than the second temperature T2, the oil passage is changed by the second oil passage switching valve 82. Since it is on the heating pipe 84 side, the oil cooler 6
When the temperature of the oil introduced into 8 is lower than that of the engine cooling water and the oil is warmed by the engine cooling water, the warmed oil passes through the heating pipe 84 and the friction coefficient of the transmission unit 18 is increased. It is supplied to the joining section 73. In this embodiment, the first oil passage switching valve 70 and the second oil passage switching valve 82 form a second oil passage switching device.

The oil heating device 60 of the second embodiment described above.
According to the above, when the oil temperature is equal to or lower than the first temperature T1, the oil passage of the oil is switched to the return pipe 72 side by the first oil passage switching valve 70, and the torque converter 16 warms up relatively early. Since the oil is directly returned to the automatic transmission 14, the oil temperature can be quickly raised.

Further, the oil heating device 60 of the second embodiment.
According to this, when the oil temperature is equal to or lower than the first temperature T1, the oil warmed relatively early by the torque converter 16 is directly supplied to the friction engagement portion 73, and the drag resistance in the friction engagement portion 73 is increased. The fuel consumption can be efficiently improved because the fuel consumption can be reduced at an early stage.

Further, the oil heating device 60 of the second embodiment.
According to the above, when the oil is warmed by the engine cooling water in the oil cooler 68, the warmed oil is directly supplied to the friction engagement portion 73, so that the drag resistance in the friction engagement portion 73 can be quickly reduced. Can be lowered.

Although the embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other aspects.

For example, in the above-described first embodiment, the warm air flow pipe 32 is connected to the oil pan 22 in order to bring it into contact with oil.
Although the hot air flow pipe 86 may be configured as shown in FIG. FIG. 4 shows the above-mentioned first
It is a diagram corresponding to FIG. 2 of the embodiment, and one end of the warm air flow pipe 86 shown in FIG. 4 is connected to the heat exchanger 28, and the opening at the other end faces the transmission unit 18 of the automatic transmission 14. It is configured to open. In this case, the air heated by the heat exchanger 28 is blown to the transmission unit 18, so that the oil in the automatic transmission 14 is also warmed.

Further, in the above-described first embodiment, the suction pipe 3
The opening 0 is open to the front side of the vehicle, and air is naturally introduced by the traveling of the vehicle. For example, the intake pipe 30 is provided so as to open toward the side surface of the vehicle. The air may be introduced by arranging the suction pipe 30 so that the air is not naturally introduced by the running of the vehicle and providing a fan for introducing the air into the suction pipe 30.

Further, in the above-described embodiment, the heat exchanger 28
Although it was a hollow columnar member, fins may be formed inside in order to promote heat exchange.

Since it is necessary to prevent the oil temperature from unnecessarily rising, the lid 3 is used in the first embodiment.
A spring 38 for urging the lid 36 toward the side that closes the opening of the suction pipe 30 is provided at one end of the lid rotation device 4.
When 0 failed, the opening of the suction pipe 30 was blocked. However, even when the lid 36 is rotated by the lid rotating device 40 to the position where the suction pipe 30 is opened to the maximum, the lid 36 is provided on the surface opposite to the side facing the suction pipe 30. Since the air comes into contact with the forward movement of the suction device, when the lid rotating device 40 fails, the opening of the suction pipe 30 is blocked by the pressure of the air. Therefore,
The spring 38 may not be provided. Also, the spring 38
When the lid 36 is urged toward the side that closes the opening of the suction pipe 30 by the urging force of, the lid 36 is provided on the surface opposite to the side facing the suction pipe 30 when the vehicle moves forward. It may be configured so that it can be rotated to a position where it does not hit the air.

Further, in the above-described second embodiment, one end of the return pipe 72 is connected to the friction engagement portion 73, but one end thereof may be arranged inside the oil pan 22.

Further, in the above-described second embodiment, the first oil passage switching valve 70 switches the oil passage to the oil cooler 68 side when the oil temperature becomes equal to or higher than the predetermined first temperature T1. The oil temperature may be compared with the temperature of the engine cooling water, and the oil passage may be switched to the oil cooler 68 side when the temperature of the engine cooling water becomes higher than the oil temperature.

In the second embodiment, the second oil passage switching valve 82 switches the oil passage to the oil pan 22 side when the oil temperature becomes equal to or higher than the predetermined second temperature T2. The oil temperature may be compared with the temperature of the engine cooling water, and the oil passage may be switched to the oil pan 22 side when the oil temperature becomes higher than the temperature of the engine cooling water.

Further, in the oil warming device 60 of the second embodiment described above, the first oil passage switching valve 70 functions as a first oil passage switching device, and the first oil passage switching valve 70 and the second oil passage switching device. Although the valve 82 functions as the second oil passage switching device, the solenoid valve 90 and the valve 92 allow the first oil passage switching device and the second oil passage switching device to operate as in the oil heating device 88 shown in FIG. It may be configured.

In FIG. 5, the solenoid valve 90 is provided with ports a, b, c, d, e and f, and the port a and the port f, the port b and the port e, and the port c and the port d are connected to each other. ing. The electronic control unit 52 compares the oil temperature detected by the oil temperature sensor 50 with the water temperature of the engine cooling water detected by the cooling water temperature sensor 94, and when the oil temperature is higher, the position of the solenoid valve 90 is changed. The oil passage 96 from the torque converter 16 is set to a position where it does not communicate with any port of the solenoid valve 90, and the valve 92 is opened. In that state, the oil warmed by the torque converter 16 is directly supplied to the friction engagement portion 73. Therefore, the solenoid valve 90, the valve 92, and the electronic control device 52 constitute a first oil passage switching device. Further, when the water temperature of the engine cooling water becomes higher than the oil temperature, the valve 92 is closed and the oil passage 96 is communicated with the port a. When the oil passage 96 and the port a are communicated with each other, the port f, the oil passage 98, and the oil passage 100 are connected.
Since the port e and the port b are communicated with the oil passage 102, the oil warmed by the engine cooling water in the oil cooler 68 is supplied to the friction engagement portion 73. When the oil temperature further rises and becomes higher than the water temperature of the engine cooling water, the oil passage 96 and the port b are made to communicate with each other. In the state where the oil passage 96 and the port b are communicated with each other, the port e and the oil passage 98 are communicated with each other, the oil passage 100 and the port d are communicated with each other, and the port c and the oil passage 104 are communicated with each other. The oil from the converter 16 is returned to the oil pan 22 through the oil cooler 68. Therefore, the solenoid valve 90 and the electronic control device 52 constitute a second oil passage switching device. This oil heating device 88
As described above, when the solenoid valve 90 and the valve 92 are controlled based on the oil temperature detected by the oil temperature sensor 50, the oil warming device 60 of the second embodiment described above.
It is also possible to control the oil temperature with higher accuracy. In the oil warming device 88 of FIG. 5, the oil from the torque converter 16 is prevented from passing through the solenoid valve 90 so that the oil temperature does not rise excessively even if the solenoid valve 90 fails. A bypass oil passage 106 to be supplied to the above is provided, and a valve 78 similar to that of the second embodiment described above is provided in the middle of the bypass oil passage 106.

The embodiment of the present invention has been described in detail with reference to the drawings, but this is merely an embodiment,
The present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of an oil heating device according to a first embodiment.

FIG. 2 is a side view showing a schematic configuration of the oil heating device of the first embodiment.

FIG. 3 is a schematic configuration diagram of a vehicle drive device including an oil heating device according to a second embodiment.

FIG. 4 is a side view showing a schematic configuration of an oil heating device different from the oil heating device shown in FIGS. 1 and 3.

5 is a diagram showing a schematic configuration of an oil heating device different from the oil heating device shown in FIGS. 1, 3 and 4. FIG.

[Explanation of symbols]

10: Oil heating device 26: Exhaust pipe 28: Heat exchanger 32: Warm air distribution pipe 50: Oil temperature sensor 52: Electronic control unit 60: Oil heating device 70: First oil passage switching valve 72: Return piping 73: Friction engaging portion 82: Second oil passage switching valve

Continued front page    (72) Inventor Torahiko Maeda             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 3J063 AA02 AB43 AC04 BA11 BA17                       BA20 CA01 CC35 CD65 XE42                       XJ03

Claims (4)

[Claims] 1. A heat exchanger that introduces air and heats the air by the heat of an exhaust pipe from the engine is provided, and the oil of the automatic transmission is heated by the air heated by the heat exchanger. Characteristic vehicle oil heating device for automatic transmission. 2. A hot air flow pipe, one end of which is connected to the heat exchanger, and a part of which is arranged in an oil pan of the automatic transmission. Oil heating device for automatic transmissions for vehicles. 3. The vehicular automatic transmission according to claim 1, further comprising a warm air flow pipe having one end connected to the heat exchanger and the other end opened toward the automatic transmission. Machine oil heating device. 4. An oil temperature sensor for detecting an oil temperature of the automatic transmission, and when the oil temperature detected by the oil temperature sensor is a temperature requiring heating,
The vehicle automatic transmission according to any one of claims 1 to 3, further comprising: a heating control device that heats oil of the automatic transmission with air heated by the heat exchanger. Oil heating device.