JP2017072147A - Refrigerant supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant supply system which reduces agitation resistance caused by a large amount of a refrigerant and reduces friction resistance caused by high viscosity of the refrigerant to reduce driving loss of a gear.SOLUTION: A refrigerant supply system includes: a transaxle case 2 for storing an automatic transmission fluid (ATF) supplied to motor generators 20, 30 and a differential gear 10; a refrigerant tank 3 which is disposed at a position separated from an inner surface of the transaxle case 2 in the transaxle case 2; an oil pump 21 which supplies the AFT in the refrigerant tank 3 to the motor generators 20, 30 and the differential gear 10; a third supply passage 74 which returns the AFT supplied to the motor generators 20, 30 to the refrigerant tank 3; and a second refrigerant passage 77 which returns the ATF supplied to the differential gear 10 to the refrigerant tank 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a refrigerant supply system, and more particularly to a refrigerant supply system that supplies refrigerant in a transaxle case to a gear mechanism and a rotating electrical machine.

  A transaxle case that houses a gear mechanism such as a differential gear stores oil (ATF) that lubricates and cools the gear. When the gear mechanism is driven by starting the engine, the oil in the transaxle case is scraped up by the gear, and this scraping becomes the stirring resistance of the gear mechanism. In particular, when the amount of oil stored in the transaxle case is large, the stirring resistance due to the scraping increases.

  In addition, when the engine is cold, the oil in the transaxle case is also cooled when the engine is cold. As shown in FIG. 8, low temperature oil has high viscosity and high frictional resistance, so the gear sliding loss is large. Become. In particular, the viscosity change in the low temperature range is larger than the viscosity change in the high temperature range. Further, as shown in FIG. 9, the gear loss reduction amount increases as the gear temperature change amount increases.

  For this purpose, a hydraulic fluid storage tank that stores the transmission oil in a heated state, a hydraulic fluid feed pump that supplies the transmission oil stored in the hydraulic fluid storage tank to the transmission, and the transmission oil stored in the hydraulic fluid storage tank And a hydraulic fluid heater for heating by the heat of the engine, and a configuration is proposed in which transmission oil stored in a hydraulic fluid storage tank is supplied to a transmission by a hydraulic fluid supply pump when the engine is cold started (for example, a patent) Reference 1).

  Some hybrid vehicles including an engine and a motor generator travel by transmitting each driving force of the engine or the motor generator to wheels via a power transmission mechanism. In order to lubricate and cool the motor generator and the power transmission mechanism with a common oil, the transaxle case that houses the power transmission mechanism and the motor case that houses the motor generator are communicated with each other. Oil is stored in both. In this configuration, in response to the problem that the agitation resistance of the gear increases due to a large amount of oil, a part of the oil in the transaxle case is moved to the motor case side when traveling by the driving force of the engine. By holding, the amount of oil in the transaxle case is reduced, and the stirring resistance of the gear of the power transmission mechanism is reduced (see, for example, Patent Document 2).

JP 2004-176877 A JP 2005-106266 A

  As described above, the cause of the drive loss of the gear mechanism in the transaxle case includes the stirring resistance due to the large amount of the refrigerant and the frictional resistance due to the high viscosity of the refrigerant.

  In the invention described in Patent Document 1, it is possible to suppress the refrigerant from becoming highly viscous and reduce the frictional resistance of the refrigerant. However, a configuration such as a hydraulic fluid storage tank or a hydraulic fluid heater is required. The structure becomes complicated. Further, since the heat of the engine is used to heat the refrigerant, it is necessary to drive the engine, which may deteriorate the fuel consumption. Furthermore, reduction of stirring resistance due to a large amount of refrigerant is not taken into consideration.

  On the other hand, in the invention described in Patent Document 2, it is possible to reduce the stirring resistance due to the large amount of the refrigerant, but no consideration is given to the reduction of the frictional resistance of the gear when the refrigerant has a low viscosity. In particular, since the refrigerant is stored in the transaxle case and the motor case and is in contact with the inner surfaces of these cases, heat is radiated through these cases, so that the refrigerant temperature tends to decrease and the viscosity of the refrigerant increases. .

  For this reason, the inventions described in Patent Documents 1 and 2 cannot simultaneously solve the stirring resistance due to the large amount of refrigerant and the frictional resistance due to the high viscosity of the refrigerant.

  Accordingly, an object of the present invention is to provide a refrigerant supply system that reduces agitation resistance due to a large amount of refrigerant and also reduces frictional resistance due to the high viscosity of the refrigerant, thereby reducing gear drive loss. And

  The refrigerant supply system of the present invention stores a rotary electric machine and a gear mechanism, stores a first refrigerant supplied to the rotary electric machine and the gear mechanism, and is separated from the inner surface of the case inside the case. A refrigerant tank for storing the first refrigerant, a pump for supplying the first refrigerant in the refrigerant tank to the rotating electrical machine and the gear mechanism, and the first tank supplied to the rotating electrical machine. A first refrigerant path that returns one refrigerant to the refrigerant tank; and a second refrigerant path that returns the first refrigerant supplied to the gear mechanism to the refrigerant tank.

  The refrigerant tank has an open top, stores a larger amount of the first refrigerant than the first refrigerant stored in the case, and the second refrigerant path is connected to the gear mechanism. The supplied first refrigerant is scraped up by rotation of a gear of the gear mechanism and returned to the refrigerant tank.

  Further, a part of the first refrigerant in the first refrigerant path is supplied to the gear mechanism.

  A refrigerant discharge valve configured to open and close a refrigerant discharge port provided at a bottom of the refrigerant tank; and a control unit configured to control an operation of the refrigerant discharge valve, wherein the control unit includes the first in the refrigerant tank. When the temperature of the refrigerant is higher than a predetermined temperature for determining whether the first refrigerant needs to be cooled, the refrigerant discharge valve is operated so as to open the refrigerant discharge port. And

  Furthermore, a heat exchanger that is disposed outside the case and exchanges heat of a second refrigerant different from the first refrigerant, branches from the first refrigerant path, and in the first refrigerant path A third refrigerant path for returning the first refrigerant to the refrigerant tank via the heat exchanger; and a branch point between the first refrigerant path and the third refrigerant path. A path switching valve that switches the refrigerant path to the refrigerant tank or the third refrigerant path, the control unit controls the operation of the path switching valve, and the control unit controls the temperature of the first refrigerant to be When lower than a predetermined temperature and lower than the temperature of the second refrigerant, or when the temperature of the first refrigerant is equal to or higher than the predetermined temperature and higher than the temperature of the second refrigerant, The first refrigerant in the first refrigerant path is the third refrigerant path. And wherein the actuating said switching valve to flow.

  According to the present invention, it is possible to reduce agitation resistance due to a large amount of refrigerant, reduce frictional resistance due to a high viscosity of the refrigerant, and reduce gear driving loss.

It is a schematic block diagram of a transaxle and a refrigerant supply system. It is sectional drawing which shows the refrigerant | coolant flow path in a rotary electric machine. It is sectional drawing seen from the axial direction of the rotary electric machine. It is a flowchart which shows control of a refrigerant | coolant supply system. It is a characteristic view explaining the action | operation of a flow-path switching valve. It is a characteristic view which shows the ATF temperature change by this embodiment structure and the conventional structure. It is a schematic block diagram which shows the modification of a refrigerant | coolant supply system. It is a characteristic view which shows the viscosity change with respect to ATF temperature. It is a characteristic view which shows the loss reduction amount with respect to a gear temperature change.

  First, the driving force transmission device 1 for a hybrid vehicle will be described. As shown in FIG. 1, the driving force transmission device 1 includes a differential gear 10 as a gear mechanism, a first motor generator 20 as a rotating electrical machine, and a second motor generator 30. These are stored in the transaxle case 2.

  In the lower part of the transaxle case 2, ATF is stored as a first refrigerant for cooling and lubricating the differential gear 10, the first motor generator 20, and the second motor generator 30.

  Inside the transaxle case 2 is disposed a deep dish-shaped refrigerant tank 3 that stores a larger amount of ATF than the ATF stored in the lower part of the transaxle case 2. That is, most of the ATF used in the transaxle case 2 is stored in the refrigerant tank 3. For this reason, the minimum ATF necessary for lubricating the differential gear 10 is stored in the lower part of the transaxle case 2.

  The refrigerant tank 3 is disposed at a position spaced from the inner surface of the transaxle case 2 and is held by a plurality of legs 4 standing on the bottom surface of the transaxle case 2. For this reason, the refrigerant tank 3 is held in a state where it floats in the air inside the transaxle case 2.

  An ATF temperature sensor 5 that detects the temperature of the ATF stored in the refrigerant tank 3 is disposed inside the refrigerant tank 3. A refrigerant discharge port 6 is provided at the bottom of the refrigerant tank 3 for discharging ATF stored in the refrigerant tank 3 to the lower part of the transaxle case 2. The refrigerant discharge port 6 is provided with a refrigerant discharge valve 7 that opens and closes the refrigerant discharge port 6. The refrigerant discharge port 7 is normally closed by the refrigerant discharge valve 7, and the refrigerant discharge port 6 is opened by operating the refrigerant discharge valve 7.

  The first motor generator 20 is mainly used as a motor for power generation, and the second motor generator 30 is mainly used for vehicle travel. A battery (not shown) is connected to the first and second motor generators 20 and 30 via a power control unit (hereinafter referred to as “PCU”) 40. The PCU 40 supplies power from the battery to the second motor generator 30 and charges the battery with the power generated by the first and second motor generators 20 and 30 during regeneration.

  Since the PCU 40 generates heat by supplying power between the first and second motor generators 20 and 30 and the battery, the hybrid vehicle includes a heat exchanger 50 such as a radiator for cooling the PCU 40. Between the PCU 40 and the heat exchanger 50, a refrigerant flow path 51 that circulates LLC as a second refrigerant for cooling the PCU 40 is provided. The refrigerant flow path 51 from the PCU 40 toward the heat exchanger 50 is provided with an LLC temperature sensor 52 that detects the temperature of the LLC flowing through the flow path. Further, the heat exchanger 50 may be used for cooling the engine or the like.

  A mechanical oil pump 21 driven by the driving force of the engine is provided on the shaft portion of the first motor generator 20. The oil pump 21 sucks up ATF from the lower part of the transaxle case 2 and the refrigerant tank 3. An electric oil pump may be used instead of the mechanical oil pump 21.

  As shown in FIGS. 2 and 3, the first motor generator 20 includes a stator 22 formed by winding a coil a plurality of times around a cylindrical stator core 22 a made of laminated steel plates, and an air gap with respect to the stator 22. And a rotor shaft 24 provided on the rotor 23.

  Refrigerant cases 26 that cover the coil ends 25 are formed at both side positions of the coil ends 25 that protrude from both end surfaces of the stator core 22a. The refrigerant case 26 has an arcuate planar shape that covers the coil end 25 over the entire circumference, and is fixed to the stator core 22a by welding, bonding, or the like. The space covered by the refrigerant case 26 forms an ATF flow path.

  An inflow port 20 a is provided at the lowest vertical portion of the refrigerant case 26, ATF fed by pressure from the oil pump 21 is supplied, and ATF is supplied to the space defined by the refrigerant case 26. Further, a discharge port 20b is provided at the uppermost vertical portion of the refrigerant case 26, and the ATF supplied to the space by the refrigerant case 26 cools the coil end 25 and the like, and then is discharged from the discharge port 20b. Although illustration of the configuration of the second motor generator 30 is omitted, the configuration is the same as that of the first motor generator 20.

  In FIG. 1, the transaxle case 2 is provided with a refrigerant supply system 60 that supplies ATF to the differential gear 10 and the first and second motor generators 20 and 30. The refrigerant supply system 60 includes a transaxle case 2, a refrigerant tank 3, an oil pump 21, a heat exchanger 50, and a refrigerant path (described later) through which refrigerant flows in the refrigerant supply system 60. In addition, the refrigerant supply system 60 includes a control unit 61 that controls the operation of the refrigerant discharge valve 7 and a later-described flow path switching valve 76 based on detection information of the ATF temperature sensor 5 and the LLC temperature sensor 52.

  Next, a plurality of ATF refrigerant paths in the refrigerant supply system 60 will be described. The refrigerant flow path as the first refrigerant path includes a first suction flow path 70 connecting the refrigerant tank 3 and the suction port 21 a of the oil pump 21, a lower portion of the transaxle case 2, and a suction port 21 a of the oil pump 21. , A first supply flow path 72 connecting the discharge port 21b of the oil pump 21 and the inlet 20a of the first motor generator 20, and a discharge port of the oil pump 21 21b and the inlet 30a of the second motor generator 30, the second supply passage 73, the outlets 20b and 30b of the first and second motor generators 20 and 30, the differential gear 10 and the refrigerant tank 3 And a third supply channel 74 for connecting the two.

  A branch flow path 75 as a third refrigerant path connected to the heat exchanger 50 is branched near the refrigerant tank 3 of the third supply flow path 74, and this branch flow path 75 is connected to the heat exchanger 50. 50 is connected to the refrigerant tank 3. At the branch position of the third supply flow path 74, a flow path switching valve 76 as a path switching valve that switches the ATF flow through the third supply flow path 74 from the third supply flow path 74 to the branch flow path 75. Is provided.

  The flow path switching valve 76 normally maintains the flow path so that the ATF flowing through the third supply flow path 74 flows into the refrigerant tank 3, and the third flow path switching valve 76 is operated to operate the third flow path switching valve 76. The flow path is switched so that the ATF flowing through the supply flow path 74 flows from the refrigerant tank 3 to the heat exchanger 50.

  The ATF temperature sensor 5, LLC temperature sensor 52, refrigerant discharge valve 7, and flow path switching valve 76 are electrically connected to the control unit 61 of the refrigerant supply system 60. Further, the control unit 61 stores an ATF cooling temperature T0 as a predetermined temperature for determining whether or not the ATF needs to be cooled, and based on the ATF cooling temperature T0 and temperature information of the ATF temperature sensor 5. Thus, the cooling of the ATF is controlled. Specifically, the control unit 61 controls the operation of the refrigerant discharge valve 7 based on the temperature information of the ATF temperature sensor 5, and the flow path switching valve 76 based on the temperature information from the LLC temperature sensor 52. Control the operation of

  Next, control of the refrigerant supply system 60 will be described. First, the initial state inside the transaxle case 2 will be described. As indicated by reference numeral 77 in FIG. 1, during driving, the ATF stored in the lower part of the transaxle case 2 is scraped up and flows into the refrigerant tank 3 by driving the differential gear 10. The ATF flow indicated by reference numeral 77 corresponds to the second refrigerant path. For this reason, the ATF is sufficiently stored in the refrigerant tank 3 at all times. When the vehicle stops in this state and parks for a long time, the ATF decreases to the same temperature as the outside air temperature.

  The hybrid vehicle travels by driving the engine and the second motor generator 30 at the start of traveling. The oil pump 21 is driven by driving the engine, and the ATF is sucked up from the refrigerant tank 3 through the first suction flow path 70 by the oil pump 21. The sucked ATF is supplied from the oil pump 21 to the inlet 20a of the first motor generator 20 via the first supply flow path 72, and flows through the flow path inside the first motor generator 20. Then, the gas is discharged from the discharge port 20b to the third supply channel 74.

  The sucked ATF is supplied from the oil pump 21 to the inflow port 30a of the second motor generator 30 via the second supply flow path 73 and flows through the flow path inside the second motor generator 30. It circulates and is discharged from the discharge port 30b to the third supply channel 74.

  A part of the ATF in the third supply channel 74 is supplied to the differential gear 10, and is scraped up by the differential gear 10 and returns to the refrigerant tank 3. A part of the ATF in the third supply flow path 74 returns to the refrigerant tank 3 via the flow path switching valve 76. In this way, the ATF inside the transaxle case 2 is circulated.

  For this reason, since the amount of ATF stored in the lower part of the transaxle case 2 is small, the amount of ATF being scraped by the differential gear 10 is reduced, and the stirring resistance due to the scraping can be suppressed.

  Next, the operation of the refrigerant discharge valve 7 and the flow path switching valve 76 in the refrigerant supply system 60 will be described based on the flowchart shown in FIG. In step S10, first, the ATF temperature Tatf in the refrigerant tank 3 is acquired from the detection result of the ATF temperature sensor 5. Then, the acquired ATF temperature Tatf is compared with the ATF cooling temperature T0 stored in the control unit 61. If the ATF temperature Tatf is lower than the ATF cooling temperature T0 (YES), it is determined that the ATF temperature does not require cooling, and the process proceeds to step S11.

  In step S11, the LLC temperature Trad flowing through the heat exchanger 50 is acquired from the detection result of the LLC temperature sensor 52, and the acquired LLC temperature Trad is compared with the ATF temperature Tatf. In step S11, it is determined whether the ATF can be heated by LLC.

  Here, heating or cooling of ATF by LLC will be described. FIG. 5 is a map showing how the flow path switching valve 76 is controlled in order to heat or cool the ATF using the temperature of the LLC. In FIG. 5, the vertical axis indicates the temperature difference between the ATF temperature and the LLC temperature, the vertical axis + indicates that the ATF temperature is higher than the LLC temperature, and the vertical axis − indicates that the ATF temperature is higher than the LLC temperature. Indicates a low state.

  As shown in FIG. 5, in the region A1, when the ATF temperature is low and the temperature difference is on the + side (region A1), it is difficult to heat the ATF by the LLC. 74 ATF is returned to the refrigerant tank 3. When the ATF temperature is low and the temperature difference is on the negative side (area A2), the ATF can be heated by the LLC, so that the ATF in the third supply channel 74 is circulated to the heat exchanger 50. .

  Further, when the ATF temperature is high and the temperature difference is on the + side (region A3), the ATF can be cooled by LLC, so that the ATF in the third supply channel 74 is circulated to the heat exchanger 50. Let When the ATF temperature is high and the temperature difference is on the negative side (area A4), it is difficult to cool the ATF by the LLC, so the ATF in the third supply flow path 74 is returned to the refrigerant tank 3.

  Therefore, in step S11, if the ATF is lower than the LLC temperature, the ATF is heated using the LLC temperature, and if the ATF is equal to or higher than the LLC temperature, the ATF is heated using the LLC temperature. Judging that it is difficult to do.

  If the ATF temperature Tatf is equal to or higher than the LLC temperature Trad (YES), the process proceeds to step S12. Since step S12 corresponds to the region A1, the flow path switching valve 76 is not operated, and the ATF from the first and second motor generators 20 and 30 is supplied to the refrigerant tank 3 at the branch point of the third supply flow path 74. Return to step S20.

  In step S11, when the ATF temperature Tatf is lower than the LLC temperature Trad (NO), the process proceeds to step S13. Step S <b> 13 corresponds to the region A <b> 2, and therefore the flow path switching valve 76 is operated to switch the third supply flow path 74 to the branch flow path 75 to the heat exchanger 50. The ATF from the third supply flow path 74 flows to the heat exchanger 50, is heated by the LLC having a temperature higher than that of the ATF, returns to the refrigerant tank 3, and proceeds to step S20.

  On the other hand, if the ATF temperature Tatf is equal to or higher than the ATF cooling temperature T0 in step S10 (NO), it is determined that the ATF is a temperature that requires cooling, and the process proceeds to step S14. In step S14, the LLC temperature Trad flowing through the heat exchanger 50 is acquired by the LLC temperature sensor 52, and the acquired LLC temperature Trad is compared with the ATF temperature Tatf. Here, it is determined whether the ATF can be cooled by LLC. That is, if the ATF is higher than the LLC temperature, the ATF is cooled using the LLC temperature, and if the ATF is equal to or lower than the LLC temperature, it is difficult to cool the ATF using the LLC temperature. Judge.

  If the ATF temperature Tatf is higher than the LLC temperature Trad (YES), the process proceeds to step S15. Since step S15 corresponds to the region A3, the flow switching valve 76 is operated to switch the third supply flow path 74 to the branch flow path 75 to the heat exchanger 50. The ATF from the third supply channel 74 flows to the heat exchanger 50, is cooled by the LLC having a temperature lower than that of the ATF, returns to the refrigerant tank 3, and proceeds to step S20.

  In step S14, if the ATF temperature Tatf is equal to or lower than the LLC temperature Trad (NO), it is determined that it is difficult to cool the ATF by LLC, and the process proceeds to step S16. Since step S16 corresponds to the region A4, the flow path switching valve 76 is not operated, and the ATF from the first and second motor generators 20 and 30 is supplied to the refrigerant tank 3 at the branch point of the third supply flow path 74. Return to step S20.

  In step S20, the ATF temperature Tatf in the refrigerant tank 3 is acquired again from the detection result of the ATF temperature sensor 5. Then, the acquired ATF temperature Tatf is compared with the ATF cooling temperature T0. If the ATF temperature Tatf is lower than the ATF cooling temperature T0 (YES), it is determined that the ATF temperature Tatf is within an allowable range that does not require cooling, and the process proceeds to step S21. In step S21, the refrigerant discharge port 6 is kept closed without operating the refrigerant discharge valve 7.

  In step S20, when the ATF temperature Tatf is equal to or higher than the ATF cooling temperature T0 (NO), it is determined that the ATF temperature Tatf has reached a temperature that requires cooling, and the process proceeds to step S22. In step S22, the refrigerant discharge valve 7 is operated to open the refrigerant discharge port 6, and the ATF in the refrigerant tank 3 is discharged to the transaxle case 2.

  Since the amount of ATF increases in the lower part of the transaxle case 2, the amount of ATF scraped up by the differential gear 10 also increases. As a result of this scraping, the ATF is brought into contact with the inner surface of the transaxle case 2 and is radiated through the transaxle case 2 to be cooled. Further, the ATF discharged to the lower part of the transaxle case 2 is sucked up by the oil pump 21 via the second suction channel 71.

  With the configuration and control described above, most of the ATF in the transaxle case 2 is stored in the refrigerant tank 3, so that the amount of ATF stored in the lower portion of the transaxle case 2 is reduced. For this reason, the amount of ATF scraped by the differential gear 10 is also reduced, and the stirring resistance due to the scraping can be suppressed.

  When the hybrid vehicle starts traveling, the hybrid vehicle travels by driving the engine and the second motor generator 30. The temperature of the ATF supplied to the second motor generator 30 rises by cooling the second motor generator 30. A part of the ATF discharged from the second motor generator 30 is supplied to the differential gear 10, while the other part is returned to the refrigerant tank 3. Since the refrigerant tank 3 is not in direct contact with the transaxle case 2, the heat radiation of the ATF stored in the refrigerant tank 3 is suppressed. In this way, in the refrigerant tank 3, the warmed ATF is circulated and the heat release of the ATF is also suppressed, so the temperature of the ATF stored in the refrigerant tank 3 rises quickly.

  The temperature change of this ATF is shown in FIG. FIG. 6 is a characteristic diagram comparing ATF temperature change B1 according to the present embodiment and ATF temperature change B2 according to the conventional structure described in Patent Document 2. As described above, according to the present embodiment, the temperature of the ATF can be quickly increased, and the ATF whose temperature has increased, that is, the ATF whose viscosity has decreased, is supplied to the differential gear 10. Resistance is suppressed and sliding loss can be suppressed.

  When the ATF becomes high temperature under high load, the ATF in the refrigerant tank 3 is discharged to the transaxle case 2 and the ATF is scraped up by the differential gear 10 in the transaxle case 2. As a result of this scraping, the contact of the ATF with the transaxle case 2 is increased, and heat is radiated through the transaxle case 2 to be cooled. For this reason, the cooling of the ATF is promoted, the ATF can be cooled in a short time, and the ATF can be efficiently cooled.

  Further, the temperature of the LLC flowing through the heat exchanger 50 is compared with the temperature of the ATF, and when the ATF temperature is lower than the LLC temperature, the ATF is heated using the LLC temperature, and conversely, the ATF temperature When the temperature is higher than the LLC temperature, the ATF is cooled using the LLC temperature. Therefore, the LLC can also be used for heating and cooling the ATF, and the ATF can be efficiently heated and cooled. it can.

  Next, a modification of the ATF supply flow path to the differential gear 10 will be described. As shown in FIG. 7, in this modification, the ATF supply flow path to the differential gear 10 is different from that of the above-described embodiment. That is, the second supply flow path 73 is branched in front of the inlet 30 a of the second motor generator 30 in the second supply flow path 73. This branched flow path extends toward the differential gear 10.

  In this manner, an ATF supply channel to the differential gear 10 may be configured. The ATF flow and the control of the refrigerant discharge valve 7 and the flow path switching valve 76 by the control unit 61 are the same as those described in the above embodiment.

  Also in this modified example, the same effects as those of the above-described embodiment can be obtained. Further, as compared with the above-described embodiment, the supply flow path for supplying ATF from the discharge port 30b of the second motor generator 30 to the differential gear 10 is not necessary, so that the pressure loss is reduced by the amount of the supply flow path, The pump loss of the oil pump 21 can be reduced.

DESCRIPTION OF SYMBOLS 1 Driving force transmission device, 2 Transaxle case, 3 Refrigerant tank, 4 Leg part, 5 ATF temperature sensor, 6 Refrigerant discharge port, 7 Refrigerant discharge valve, 10 Differential gear, 20 1st motor generator, 20a, 30a Inlet 20b, 30b Discharge port, 21 Oil pump, 21a Suction port, 21b Discharge port, 22 Stator, 22a Stator core, 23 Rotor, 24 Rotor shaft, 25 Coil end, 26 Refrigerant case, 30 Second motor generator, 50 Heat exchange , 51 refrigerant flow path, 52 LLC temperature sensor, 60 refrigerant supply system, 61 control unit, 70 first suction flow path, 71 second suction flow path, 72 first supply flow path, 73 second supply Channel, 74 third supply channel, 75 branch channel, 76 channel switching valve, 77 second refrigerant channel, T0 ATF cooling temperature, Ta f ATF temperature, Trad LLC temperature.

Claims (5)

A case for storing the rotating electrical machine and the gear mechanism, and storing a first refrigerant supplied to the rotating electrical machine and the gear mechanism;
Inside the case, a refrigerant tank that is disposed at a position spaced from the inner surface of the case and stores the first refrigerant;
A pump for supplying the first refrigerant in the refrigerant tank to the rotating electrical machine and the gear mechanism;
A first refrigerant path for returning the first refrigerant supplied to the rotating electrical machine to the refrigerant tank;
A second refrigerant path for returning the first refrigerant supplied to the gear mechanism to the refrigerant tank;
A refrigerant supply system comprising: The refrigerant supply system according to claim 1,
The refrigerant tank has an upper opening, stores a larger amount of the first refrigerant than the first refrigerant stored in the case,
The second refrigerant path scrapes up the first refrigerant supplied to the gear mechanism by rotation of a gear of the gear mechanism and returns it to the refrigerant tank.
A refrigerant supply system. The refrigerant supply system according to claim 1 or 2,
A refrigerant supply system, wherein a part of the first refrigerant in the first refrigerant path is supplied to the gear mechanism. The refrigerant supply system according to any one of claims 1 to 3,
A refrigerant discharge valve that opens and closes a refrigerant discharge port provided at the bottom of the refrigerant tank;
A control unit for controlling the operation of the refrigerant discharge valve;
With
The control unit opens the refrigerant discharge port when the temperature of the first refrigerant in the refrigerant tank is higher than a predetermined temperature for determining whether the first refrigerant needs to be cooled. The refrigerant supply system is characterized in that the refrigerant discharge valve is operated. The refrigerant supply system according to claim 4,
A heat exchanger disposed outside the case and exchanging heat of a second refrigerant different from the first refrigerant;
A third refrigerant path branched from the first refrigerant path and returning the first refrigerant in the first refrigerant path to the refrigerant tank via the heat exchanger;
A path switching valve that is provided at a branch point between the first refrigerant path and the third refrigerant path, and switches the first refrigerant path to the refrigerant tank or the third refrigerant path;
With
The control unit controls the operation of the path switching valve;
The controller is configured such that when the temperature of the first refrigerant is lower than the predetermined temperature and lower than the temperature of the second refrigerant, or the temperature of the first refrigerant is equal to or higher than the predetermined temperature, In addition, when the temperature of the second refrigerant is higher, the path switching valve is operated so that the first refrigerant in the first refrigerant path flows into the third refrigerant path. Supply system.

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