JP2011179690A - Heat pipe type cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a heat pipe type cooling system capable of changing heat radiation amount in a high temperature section using a heat pipe. <P>SOLUTION: A motor cooling system 26 as a heat pipe type cooling system includes: a heat pipe 34 connected between a cooling oil sump 50 as a high temperature section and an oil cooler 32 and in which working fluid is enclosed internally; and a rotary part. The heat pipe 34 comprises a heat absorbing end 66 connected with the cooling oil sump 50, a radiation end 68 connected with the oil cooler 32, and a main part 70 provided in the middle of the heat pipe with a u-shaped part 72 which is bent in projecting shape. The heat pipe 34 is rotatably disposed so that the rotary part is capable of changing heat radiation amount in the cooling oil sump 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat pipe type cooling system including a heat pipe connected between a high temperature part and a low temperature part and in which a working fluid is enclosed.

  As an electric vehicle, an electric vehicle using an electric motor as a drive source, and a hybrid vehicle equipped with an electric motor and an engine and running with at least one of the electric motor and the engine as a main drive source are known and partially put into practical use. Yes. Such an electric vehicle includes a heat source that generates heat during use, such as an electric motor, an inverter that drives the electric motor, and a battery for supplying electric power. For this reason, the structure which cools a heat-generation source conventionally is considered.

  For example, the battery temperature control device described in Patent Document 1 circulates a coolant between a battery and a radiator, cools the battery, and cools the coolant whose temperature has risen by the radiator, A refrigerant circulation circuit having a compressor, an evaporator, and a heat exchanger for heating, and a hot liquid circulation circuit for circulating the warm liquid heated by the heating heat exchanger to the heater core are provided. The coolant circulation circuit is provided with a coolant bypass path that bypasses the radiator to form a warm fluid circulation circuit and a closed circuit, and the coolant flow path is connected to the radiator and coolant bypass in the coolant circulation circuit. There is provided a first switching means constituted by a valve for switching to any one of the paths. In addition, the warm liquid circulation circuit is provided with a second switching means configured by a valve that can shut off one of the heater core and the heat exchanger for heating and form a closed circuit between the other and the battery. .

JP 2002-352867 A

  The battery temperature control device described in Patent Document 1 is intended to control the temperature of a battery that is a heat generation source. For example, when the battery is cooled by rapid charging, The coolant circulates in a closed circuit including a part of the heater core of the warm liquid circulation circuit. In this case, the coolant does not flow through the heating heat exchanger. In addition, when the battery is warmed up for rapid charging, the coolant in the coolant circulation circuit circulates in a closed circuit including a heating heat exchanger that is part of the warm fluid circulation circuit. In this case, the coolant does not flow through the heater core.

  However, in order to control the temperature of the battery, it is necessary to provide first switching means and second switching means each constituted by a valve. For this reason, it is necessary to provide many valves, and the control thereof is complicated. For this reason, it is required to realize a cooling system in which the amount of cooling of the heat generation source is variable with a configuration in which valves can be omitted or reduced. In addition to the battery, the heat source includes a motor, an inverter, and the like. In particular, in electric vehicles and high-efficiency hybrid vehicles, where the market is expected to expand further in the future, the temperature in the passenger compartment is reduced because the engine heat generation is reduced or the engine does not generate heat. There is a possibility that the heat of the heat source such as the engine cannot be used for the air conditioning equipment for adjusting the air conditioner. Under such circumstances, it is more desirable to realize a heat source cooling system that can change the cooling amount of the heat source with a simple configuration.

  In order to realize such a heat generation source cooling system, the present inventor has come to consider that it is necessary to realize a simple configuration in which the amount of heat radiation at a high temperature portion provided in a path including the heat generation source is variable. . For this purpose, the present inventor has considered a heat pipe type cooling system that uses a heat pipe with a devised structure to change the amount of heat released in the high temperature part.

  An object of the present invention is to realize a heat pipe type cooling system that uses a heat pipe to change the amount of heat radiation at a high temperature part.

  A heat pipe type cooling system according to the present invention includes a heat pipe connected between a high temperature part and a low temperature part, in which a working fluid is enclosed, and a rotating part. The heat pipe is connected to the high temperature part. Including a heat absorbing end, a heat radiating end connected to the low temperature portion, and a main body portion having a U-shaped portion provided in the middle portion and bent in a projecting manner. The part is a heat pipe type cooling system characterized in that the heat radiation at the high temperature part is variable by making the heat pipe rotatable.

  Further, in the heat pipe type cooling system according to the present invention, preferably, the heat pipe type cooling system includes a heat generation source, and includes a refrigerant circulation path for cooling the heat generation source by circulating the refrigerant, and the high temperature portion is provided in the refrigerant circulation path. Yes.

  In the heat pipe type cooling system according to the present invention, preferably, the low-temperature part is a part of the second refrigerant circulation path or an air-cooled heat dissipation part.

  In the heat pipe type cooling system according to the present invention, preferably, the refrigerant circulation path is a cooling oil circulation path for circulating the cooling oil as the refrigerant, and the high temperature part is provided in a part of the cooling oil circulation path. Cooling oil reservoir.

  Moreover, in the heat pipe type cooling system according to the present invention, preferably, the rotating part rotates the heat pipe so that the U-shaped part is tilted horizontally and the U-shaped part is upright. Can be switched between.

  According to the heat pipe type cooling system according to the present invention, the amount of heat radiation at the high temperature part can be made variable by rotating the heat pipe so that the direction of the U-shaped part is changed by the rotating part. For this reason, the structure which makes variable the amount of heat radiation in a high temperature part is realizable using a heat pipe.

1 is a schematic diagram showing an example of a hybrid vehicle equipped with a heat pipe type cooling system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a cooling oil circulation path, a coolant circulation circuit, and a warm fluid circulation circuit that constitute the hybrid vehicle of FIG. 1. It is a schematic diagram showing a motor cooling system which is an example of a heat pipe type cooling system of an embodiment concerning the present invention. It is a perspective view which shows the heat pipe shown in FIG. 3 in the case where a U-shaped part is made into an upright state. It is a perspective view which shows the heat pipe shown in FIG. 3 in the case where a U-shaped part is fallen to a horizontal state. 4 is a schematic view of the U-shaped portion shown in FIG. 3 as viewed in the direction of arrow γ in FIG. 4A. It is a figure for demonstrating the heat-transfer path | route in the case of enlarging the cooling amount of a motor generator in one example of embodiment which concerns on this invention. It is a figure for demonstrating the heat-transfer path | route in the case of making small the cooling amount of a motor generator in one example of embodiment which concerns on this invention.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to FIGS. A motor cooling system that is a heat pipe type cooling system of the present embodiment and is a heat source cooling system is mounted and used in a hybrid vehicle. As shown in FIG. 1, the hybrid vehicle 10 includes an axle 14 coupled to wheels 12, an engine 16, a planetary gear unit 18, a reduction gear mechanism 20, a first motor generator 22 (MG1), and a second motor. And a generator 24 (MG2). Each motor generator 22, 24 has a function as a motor and a function as a generator. For example, the first motor generator 22 is a generator that generates electricity by driving the engine 16, but may be used as a motor. The second motor generator 24 is mainly used as a traveling motor, but may be used as a generator, that is, for power regeneration.

  Since each motor generator 22, 24, which is a heat source, rises in temperature and becomes hot during operation, a motor cooling system 26 (FIGS. 2 and 3) described later is used to cool each motor generator 22, 24. is doing.

  The hybrid vehicle 10 can be an FF vehicle that is a front wheel drive vehicle with a front engine, an FR vehicle that is a rear wheel drive vehicle with a front engine, a 4WD vehicle that is a four wheel drive vehicle, or the like. In addition, the heat pipe type cooling system according to the present invention can be used for cooling a traveling motor by mounting it on an electric vehicle or the like using a traveling motor as a driving source of the vehicle without mounting an engine. . The heat pipe type cooling system can also be used to cool an inverter, a battery, and the like, which are heat sources, in an electric vehicle such as a hybrid vehicle or an electric vehicle.

  The planetary gear unit 18 includes a power split mechanism constituted by a first planetary gear mechanism and a speed reduction mechanism constituted by a second planetary gear mechanism, although detailed illustration is omitted. The power split mechanism can split the power from the engine 16 into a path to the axle 14 and a path to the first motor generator 22. For example, the power split mechanism connects the sun gear of the first planetary gear mechanism to the end of the rotating shaft of the first motor generator 22 that is hollow. The carrier connected to the planetary gear of the first planetary gear mechanism is connected to the drive shaft of the engine 16 inserted through the inside of the rotation shaft of the first motor generator 22. Further, the drive gear 28 provided outside the ring gear of the first planetary gear mechanism is engaged with the input side gear constituting the reduction gear mechanism 20, and the output side gear constituting the reduction gear mechanism 20 is coupled to the axle 14. ing. A power split mechanism can be connected to the drive shaft of the engine 16 via a damper (not shown).

  The first motor generator 22 can also be used as a motor for starting the engine 16, but when the first motor generator 22 is used as a generator, at least a part of the torque from the engine 16 input from the carrier is used. Then, it is transmitted to the rotating shaft of the first motor generator 22 via the sun gear, and is caused to generate electric power as the engine 16 is driven.

  The rotation of the engine 16 is extracted to the first motor generator 22 side or the second motor generator 24 side via a power split mechanism or a speed reduction mechanism. Electric power generated by driving first motor generator 22 is charged in a battery (not shown) that is a power storage unit.

  The power generated by the driving of the second motor generator 24 is transmitted to the wheels 12 via the speed reduction mechanism, the speed reduction gear mechanism 20 and the axle 14 which are constituted by the second planetary gear mechanism, and the wheels 12 are driven. The hybrid vehicle 10 travels using at least one of the engine 16 and the second motor generator 24 as a main drive source. Each motor generator 22, 24 is driven by a corresponding inverter using battery power. The hybrid vehicle 10 is equipped with a motor cooling system 26 (FIGS. 2 and 3) to cool the motor generators 22 and 24.

  That is, as shown in FIG. 2, the motor cooling system 26 includes first and second motor generators 22 and 24, and circulates cooling oil (for example, ATF (automatic transmission fluid)) as a refrigerant, A cooling oil circulation path 30 that is a refrigerant circulation path for cooling the motor generators 22 and 24, an oil cooler 32 that is a low temperature part, a heat pipe 34, a rotating part 36, and a second refrigerant for cooling the inverter. A cooling fluid circulation circuit 38, which is a circulation path, and a warm fluid circulation circuit 40 for increasing the passenger compartment temperature are provided.

  First, the cooling oil circulation path 30 includes a first path 42 that circulates the cooling oil through the oil path, and second and third paths 44 and 46 that are provided in part in the first path 42 in parallel with the oil flow direction. And an oil pump 48. The oil pump 48 is driven by the engine 16 (FIG. 1), and circulates the cooling oil in the cooling oil circulation path 30 in the direction of arrow α in FIG. The first motor generator 22 is provided in the second path 44, and the second motor generator 24 is provided in the third path 46.

  Between the second path 44 and the third path 46 and the oil pump 48, a cooling oil reservoir 50 that is a high temperature part is provided. FIG. 3 specifically shows a part of the cooling oil circulation path 30 of FIG. The motor generators 22 and 24, the planetary gear unit 18, and the reduction gear mechanism 20 are accommodated in a case (not shown). A cooling oil reservoir 50 is provided at the lower part of the case, and the cooling oil accumulated in the cooling oil reservoir 50 by the rotation of the gears constituting the reduction gear mechanism 20 and the like is lifted upward, The cooling oil can be taken into the upper tank portion 52 provided in the inner portion of the case located above the gear. When the cooling oil taken into the upper tank portion 52 flows downward, it cools the motor generators 22 (24) and gears and flows toward the cooling oil reservoir 50. The cooling oil is swung up from the cooling oil reservoir 50 by a gear, and the second and third paths 44 and 46 are configured by the upper tank portion 52, the motor generators 22 and 24, and the portion where the cooling oil flows to the gear. That is, the cooling oil flows in the direction of the broken line arrow α in FIG. The cooling oil reservoir 50 is connected to a heat pipe 34, which will be described later.

  As shown in FIGS. 2 and 3, the coolant circulation circuit 38 is for cooling the inverter unit 54 including two inverters respectively driving the motor generators 22 and 24 with coolant, that is, LLC. The radiator 56, the inverter unit 54, the oil cooler 32 which is a low temperature part, and the coolant pump 58 are connected by a pipe line. By driving the coolant pump 58, the coolant circulates through the coolant circulation circuit 38. When the coolant passes through the radiator 56, the coolant exchanges heat with the air passing through the outside of the radiator 56. That is, the radiator 56 has the same configuration as the engine radiator that cools the engine 16 (FIG. 1), and the coolant is cooled by air. The coolant flows through the coolant circulation circuit 38 in the direction of arrow β in FIGS. Further, when the low-temperature coolant passes through the oil cooler 32, the heat radiating end 68 of the heat pipe 34, which will be described later, inserted into the oil cooler 32 is cooled. The heat radiating end 68 can also be inserted into the coolant inside the wall portion constituting the oil cooler 32.

  As shown in FIG. 2, the warm liquid circulation circuit 40 warms the vehicle interior heater 62 by allowing the warm liquid to pass through the vehicle interior heater 62 constituting the vehicle air conditioning unit. For this reason, the warm liquid circulation circuit 40 is configured by connecting the vehicle interior heater 62, the warm liquid pump 64, and the heat exchanging unit 76 through a pipe line. When the hot liquid pump 64 is driven, the hot liquid circulates through the hot liquid circulation circuit 40. When the vehicle interior heater 62 is used, the air is heated by passing the air outside the vehicle interior heater 62, and the heated air is blown out into the vehicle interior. The heat exchanging unit 76 exchanges heat between the cooling oil flowing through the cooling oil circulation path 30 and the hot liquid circulating through the hot liquid circulation circuit 40. In this case, the heat exchanging unit 76 may be configured by inserting a pipe or a heat transfer member provided in the path 30 or the circuit 40 and having a closed end into a part of the circuit 40 or the path 30 on the other side. it can. For example, water is used as the warm liquid. In addition, the engine 16 (FIG. 1) can be provided in the middle of the warm liquid circulation circuit 40, and the temperature of the warm liquid can be further increased by the heat generated by the engine 16. In this case, the heat exchange unit 76 can be omitted. That is, a warm liquid circulation circuit can be provided independently of the cooling oil circulation path 30. In this case, the coolant circulation circuit 38 and the warm liquid circulation circuit can be a common circuit for circulating the LLC.

  As shown in FIGS. 4A and 4B, the heat pipe 34 is constituted by a metal pipe whose both ends are closed, and a working fluid, for example, water, ammonia or the like is enclosed therein. The heat pipe 34 includes a heat absorbing end 66 and a heat radiating end 68 provided at both end portions, and a main body portion 70 which is a heat insulating portion provided at an intermediate portion. The main body part 70 has a U-shaped part 72 that is bent so as to be folded back on one side.

  In addition, the heat pipe 34 supports both sides of a fixed portion of a vehicle body (not shown) so as to be rotatable by a bearing or the like. As shown in FIG. 5, when the heat pipe 34 is viewed from the direction of the arrow γ in FIG. 4A, the U-shaped portion 72 is oriented horizontally (P position in FIG. 5) as shown by the arrow in FIG. 5. , And can be rotated between the upright state (Q position in FIG. 5). Further, the heat absorption end 66 and the heat dissipation end 68 of the heat pipe 34 are provided at the same position in the height direction.

  Further, as shown in FIG. 2, for example, the rotating portion 36 is configured by connecting to the U-shaped portion 72 of the heat pipe 34 by a link or the like on the back of the passenger compartment heater operating lever 74 around the driver's seat. is doing. The heat pipe 34 can be rotated according to the rotation of the vehicle compartment heater operation lever 74. That is, the rotation part 36 can be switched between a state in which the U-shaped part 72 is tilted horizontally and a state in which the U-shaped part 72 is made upright by enabling the heat pipe 34 to rotate. For example, the U-shaped portion 72 is in a horizontal state when the casing heater operation lever 74 is OFF, and the U-shaped portion 72 is in an upright state when the casing heater operation lever 74 is ON and operated to the high temperature side. The U-shaped portion 72 is inclined between the horizontal position and the upright position in a state where the passenger compartment heater operating lever 74 is turned on and operated to the low temperature side.

  The vehicle compartment heater operation lever 74 is simply a two-stage switching type between ON and OFF, the vehicle compartment heater operation lever 74 is OFF, the U-shaped portion 72 is horizontal, and the vehicle compartment heater operation lever 74 is ON. The character-shaped part 72 can also be made into an upright state.

  As shown in FIG. 3, such a heat pipe 34 has a heat absorption end 66 connected to a cooling oil reservoir 50 that is a high temperature part, and a heat radiation end 68 connected to an oil cooler 32 that is a low temperature part. In the oil cooler 32, the coolant passes through the inside as described above, and the heat radiating end 68 is inserted in the wall portion or the inside of the wall portion of the oil cooler 32. When the heat radiating end 68 is inserted inside the wall portion of the oil cooler 32, the portion where the end portion of the heat pipe 34 penetrates the wall portion of the oil cooler 32 is liquid-tightly sealed.

  As apparent from the configuration shown in FIG. 2, the motor cooling system 26 circulates in the hot liquid circulation circuit 40 that is transferred from the cooling oil as the temperature of the cooling oil flowing through the cooling oil circulation path 30 increases. The temperature of the warm liquid can be increased more greatly, and the temperature of the vehicle interior heater 62 can be increased more greatly. For this reason, the temperature of the air that has passed through the vehicle interior heater 62 can also be increased. Conversely, the lower the temperature of the cooling oil, the lower the temperature in the vehicle interior heater 62.

  When the U-shaped portion 72 of the heat pipe 34 stands upright based on the operation of the vehicle compartment heater operation lever 74 or the like, the cooling amount of the second motor generator 24 is reduced and the temperature is likely to rise. That is, as shown in FIG. 4B, in response to turning off of the vehicle compartment heater operation lever 74 or the like, when the U-shaped portion 72 is in the horizontal state, the working fluid in the heat pipe 34 has the heat absorption end 66 at the cooling oil reservoir 50 ( 3), the heat from the high-temperature cooling oil in the cooling oil reservoir 50 is transmitted to the endothermic end 66, and the working fluid is heated and evaporated. At this time, the latent heat of vaporization is removed, so that the temperature of the cooling oil in the cooling oil reservoir 50 in contact with the endothermic end 66 decreases. That is, the amount of heat released from the cooling oil reservoir 50 is increased. In this case, the cooling amount of the second motor generator 24 is increased.

  Further, the working fluid evaporated at the heat absorbing end 66 to become steam reaches the heat radiating end 68 inserted into the oil cooler 32 (FIG. 3) through the main body 70, and is cooled by the low temperature oil cooler 32 at the heat radiating end 68. Condensed and liquefied. The working fluid that has become liquid moves from the heat absorbing end 66 to the heat radiating end 68 through the main body 70. In this case, since the U-shaped portion 72 is in a horizontal state, the reciprocating movement between the heat absorbing end 66 and the heat radiating end 68 of the working fluid is not hindered. For this reason, the movement of heat between the heat absorption end 66 and the heat dissipation end 68 is promoted.

  When the U-shaped portion 72 is in a horizontal state as described above, the temperature of the cooling oil flowing through the cooling oil circulation path 30 shown in FIGS. 2 and 3 can be greatly reduced, and each motor generator 22 cooled by this cooling oil. 24 can be drastically reduced in temperature. It should be noted that another heating element such as a battery or the engine 16 (FIG. 1) may be provided in a part of the cooling oil circulation path 30 such as the position of the broken line R in FIG. 2 and the heating element may be cooled by the cooling oil.

  On the other hand, as shown in FIGS. 3 and 4A, when the U-shaped portion 72 is in an upright state corresponding to the ON of the vehicle compartment heater operation lever 74, the cooling oil reservoir 50, the oil cooler 32, The reciprocating movement of the working fluid inside the heat pipe 34 in contact with the heat pipe 34 becomes impossible. For example, the working fluid heated to the endothermic end 66 and converted into vapor moves to the heat radiating end 68, then drops in temperature and liquefies at the heat radiating end 68, and tries to move again to the endothermic end 66 through the main body 70. It becomes impossible for the working fluid that has become liquid to move from the heat radiating end 68 to the heat absorbing end 66 beyond the U-shaped portion 72 that has become high. For this reason, the movement of heat between the heat absorbing end 66 and the heat radiating end 68 is blocked, and as a result, the temperature of the cooling oil in the cooling oil reservoir 50 cannot be significantly lowered. That is, the amount of heat released from the cooling oil reservoir 50 is reduced. For this reason, the cooling amount of each motor generator 22 and 24 cooled with this cooling oil becomes small, and each temperature fall becomes small. Further, since the temperature drop of the high-temperature cooling oil is reduced, the temperature rise of the warm liquid flowing through the warm liquid circulation circuit 40 (FIG. 2) transferred from the cooling oil is increased, and the temperature rise of the vehicle interior heater 62 is increased. growing. For this reason, the temperature in the passenger compartment can be increased.

  6 and 7 are diagrams for explaining a heat transfer path in the case of cooling the second motor generator 24 that is a heat generation source in the present embodiment. FIG. 6 corresponds to a state in which the U-shaped portion 72 (FIG. 3) of the heat pipe 34 is leveled, and the heat of the second motor generator 24 is transferred to the cooling oil, and the vehicle is transferred from the cooling oil through the hot liquid. Heat is transferred to the indoor heater 62. Further, the heat of the cooling oil is transferred from the cooling oil reservoir 50 (FIG. 3) to the oil cooler 32 through the heat pipe 34. For this reason, the temperature of the second motor generator 24 can be significantly reduced.

  On the other hand, FIG. 7 corresponds to a state in which the U-shaped portion 72 (FIG. 3) of the heat pipe 34 is upright, and heat transfer from the cooling oil reservoir 50 (FIG. 3) to the oil cooler 32 through the heat pipe 34. It will not be done. For this reason, the temperature of the cooling oil cannot be significantly decreased, and the temperature decrease of the second motor generator 24 is reduced. Moreover, since the cooling oil also cools the first motor generator 22 (FIG. 2), the temperature drop of the first motor generator 22 is also reduced.

  Therefore, according to the present embodiment, by rotating the heat pipe 34 so that the rotating part 36 stands upright on the U-shaped part 72, the temperature drop of the high-temperature motor generators 22 and 24 is reduced, and the vehicle The temperature of the indoor heater 62 can be greatly increased. In addition, a configuration in which the amount of heat radiation in the cooling oil reservoir 50 is variable and the amount of cooling of the motor generators 22 and 24 is variable can be realized with a simple configuration without using many valves. For this reason, the structure which makes variable the heat dissipation in the cooling oil reservoir 50 with a simple structure using the heat pipe 34 can be realized.

  On the other hand, unlike the case of the present invention, only the state shown in FIG. 6 can be realized, that is, the state shown in FIG. 7 cannot be realized. That is, it is also conceivable to arrange a conventionally known simple rod-like heat pipe so as not to rotate and to cool the cooling oil through the heat pipe and the oil cooler. However, in this case, the amount of cooling of the motor generator cannot be made variable, and the motor generator is uniformly dissipated, and adjustments such as increasing the temperature of the motor generator quickly or cooling it quickly are made. I can't. On the other hand, according to the present embodiment, such a problem does not occur, and the temperature of the motor generator can be easily adjusted to a desired temperature quickly.

  In the present embodiment, the heat absorbing end 66 and the heat radiating end 68 of the heat pipe 34 are provided at the same position in the height direction, but the heat radiating end 68 of the heat pipe 34 is above the heat absorbing end 66. In this way, the heat pipe 34 can be arranged to be inclined. In this case, the U-shaped portion 72 is inclined in the same direction as the other portions of the heat pipe 34 so that the uprightness is low, and the direction in which only the U-shaped portion 72 is different from the other portions of the heat pipe 34. In addition, it is possible to switch between the tilted state so as to increase the uprightness. Then, in a state where the U-shaped portion 72 is inclined so that the uprightness is lowered, the reciprocating movement of the working fluid in the heat pipe 34 between the heat absorbing end 66 and the heat radiating end 68 is enabled, and the uprightness is increased. When the U-shaped portion 72 is inclined as described above, the reciprocation between the heat absorbing end 66 and the heat radiating end 68 of the working fluid in the heat pipe 34 is disabled. Also in this case, it is possible to realize a configuration in which the heat radiation amount in the cooling oil reservoir 50 is variable with a simple configuration.

  Further, in the present embodiment, the rotating part is not limited to the configuration in which the U-shaped part 72 is connected to the vehicle compartment heater operation lever 74 by a link. A sensor for detecting an operation position, a control unit to which a detection signal of the sensor is input, a motor driven by a control signal output from the control unit, a rotation mechanism constituted by gears, etc. The pipe 34 can also be rotated according to the operation of the vehicle compartment heater operation lever. In addition, the rotating unit is not interlocked with the vehicle compartment heater operation lever, and when the control unit determines that the temperature of the motor generator has deviated from the desired temperature, the rotation is performed so that the motor generator approaches the desired temperature. It can also be configured to output a control signal to the mechanism.

  Further, in the present embodiment, the high temperature portion connecting the heat absorption end 66 of the heat pipe 34 is the cooling oil reservoir 50, but the present invention is not limited to such a configuration. For example, an endothermic end 66 of the heat pipe 34 is connected in the middle of a pipeline constituting a cooling oil circulation circuit for circulating the cooling oil so as to supply the cooling oil to the motor generator, and this connected portion is used as a high temperature portion. You can also. In this embodiment, the heat generator cooled by the cooling oil is a motor generator. However, the heat source is not limited to this. For example, an inverter or a heat source that cools the battery through the heat pipe 34 is used. You can also. For example, the state where the cooling amount of the inverter unit 54 including the inverter is variable by the heat pipe 34 is also shown in FIGS.

  Further, the motor generator, the inverter, the battery, etc. can be cooled with cooling water, and the heat absorption end 66 of the heat pipe 34 can be connected in the middle of the cooling water circulation path for circulating the cooling water, and this connected portion can be used as a high temperature part. . Further, in the present embodiment, the case where the motor generator of the hybrid vehicle is cooled has been described. However, when a motor having a simple motor function provided in an electric vehicle or the like is cooled, a cooling oil pool in the middle of the motor cooling unit is cooled. The heat absorption end 66 of the heat pipe 34 can also be connected to a high temperature part such as.

  Further, the oil cooler that connects the heat radiating end 68 of the heat pipe 34 may be an air-cooled configuration having a plurality of fins, that is, an air-cooled heat radiating portion, instead of the water-cooled type as in the present embodiment. In this case, the oil cooler exchanges heat between the air passing through the fins and the working fluid in the heat pipe 34, and lowers the temperature of the working fluid that has reached the heat radiating end 68 to be liquefied. In this case, the oil cooler can be provided separately from the coolant circulation path, and when the coolant circulation path is unnecessary, this path can be omitted.

  DESCRIPTION OF SYMBOLS 10 Hybrid vehicle, 12 wheel, 14 axle, 16 engine, 18 planetary gear unit, 20 reduction gear mechanism, 22 1st motor generator, 24 2nd motor generator, 26 motor cooling system, 28 drive gear, 30 cooling oil circulation path, 32 Oil cooler, 34 Heat pipe, 36 Rotating part, 38 Coolant circulation circuit, 40 Warm liquid circulation circuit, 42 1st path, 44 2nd path, 46 3rd path, 48 Oil pump, 50 Cooling oil pool, 52 Upper tank part, 54 Inverter unit, 56 Radiator, 58 Coolant pump, 62 Car interior heater, 64 Warm liquid pump, 66 Heat absorption end, 68 Heat release end, 70 Body part, 72 U-shaped part, 74 Car compartment heater operation lever, 76 Heat exchange section.

Claims (2)

A heat pipe connected between the high temperature part and the low temperature part, in which the working fluid is enclosed,
A rotating part,
The heat pipe includes a heat absorption end connected to the high temperature portion, a heat dissipation end connected to the low temperature portion, and a main body portion having a U-shaped portion provided in the middle portion and bent in a projecting manner. Are located in
The heat pipe type cooling system is characterized in that the rotating part makes the heat radiation variable in the high temperature part by making the heat pipe rotatable. In the heat pipe type cooling system according to claim 1,
Including a heat generation source, provided with a refrigerant circulation path for cooling the heat generation source by circulating the refrigerant;
The heat pipe type cooling system, wherein the high temperature part is provided in the refrigerant circulation path.

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