JP2019146376A - Rotary electric machine unit, rotary electric machine, and vehicle - Google Patents

Abstract

To provide a rotary electric machine unit, a rotary electric machine, and a vehicle that are capable of cooling during hill-climbing without increasing an amount of coolant discharge during a normal time.SOLUTION: A rotary electric machine unit 20 comprises: a coolant passage 43 and a coolant supply pipe 33 that sends a coolant toward a rotary electric machine main body; first cooling dropping pipes 31a to 31c that discharge the coolant in the coolant supply pipe 33 above the rotary electric machine main body; a second cooling dropping pipe 32 that discharges the coolant in the coolant supply pipe 33 in front of the rotary electric machine main body; a coolant switching mechanism 35 for switching a channel to the second cooling dropping pipe 32; and an ECU 2 (hill-climbing determination unit) for determining a hill-climbing of a vehicle. The hill-climbing determination unit discharges the coolant from the second cooling dropping pipe 32 by opening the coolant switching mechanism 35 when it is determined that the vehicle is in hill-climbing.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine unit, a rotating electrical machine, and a vehicle.

A hybrid vehicle is equipped with an engine (internal combustion engine) and a traveling motor as a traveling power source, and achieves highly efficient traveling by appropriately using both or one of them. For example, when cruising on highways, etc., the engine is used exclusively, and when accelerating or climbing, both the engine and the motor for driving are used to achieve good fuel efficiency and high driving performance. ing.
In a hybrid vehicle having a generator and an electric motor, cooling of the stator side coil is performed by dropping a refrigerant such as ATF (Automatic Transmission Fluid) that also serves as gear lubrication of the transmission onto the stator side coil of the generator and the electric motor. Has been done.

  Patent Document 1 includes a rotor that includes a rotor shaft and a rotor core that is fixed to an outer peripheral portion of the rotor shaft and is rotatably held, and a stator that is rotatably fixed to the outer peripheral side of the rotor. An electric motor, an axial oil passage formed in the axial direction in the rotor core, an oil supply oil passage for supplying oil to the axial oil passage, and between the oil supply oil passage and the axial oil passage A vehicle provided with a bimetal or a shape memory alloy that is provided so as to be openable and closable and that is deformed to communicate the oil supply oil passage and the axial oil passage when the temperature of the rotor reaches a preset cooling required temperature. Is described. The electric motor cooling device for a vehicle described in Patent Document 1 is capable of suppressing oil shear loss and pump loss by controlling the oil supplied to the electric motor according to the running state of the vehicle.

  Patent Document 2 discloses a vehicle drive device in which two motors / generators are arranged in parallel. The two motors / generators each have a rotation axis, and are arranged so that the rotation axes of each other overlap in a coaxial manner. A cooling path is formed along the axial direction of the rotating shaft in the rotating shaft of each motor / generator. The refrigerant sent out from the pump flows through the cooling path of the rotary shaft, and jets the refrigerant from a plurality of refrigerant jet holes formed in each rotary shaft. According to Patent Document 2, it is thereby possible to effectively cool two motor / generators including switching elements housed in each housing of the motor / generator.

JP 2011-125167 A JP 2003-339102 A

However, the rotating electrical machine cooling is optimized on a flat road, and cooling specifically for an uphill road (a state in which the rotating electrical machine is tilted), which is one of the severe states of winding heat generation, has not been realized.
Since cooling oil (refrigerant) flows from the upper part of the rotating electric machine, there is a problem that only the refrigerant warmed by the cooling of the upper part flows into the lower part of the rotating electric machine.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a rotating electrical machine unit, a rotating electrical machine, and a vehicle that can be cooled during climbing without increasing the refrigerant discharge amount at the normal time. To do.

  In order to solve the above-mentioned problem, the rotating electrical machine unit according to claim 1 is a rotating electrical machine unit mounted on a vehicle, wherein the rotating electrical machine body, a refrigerant flow path for feeding a refrigerant toward the rotating electrical machine body, A first refrigerant discharge section that discharges the refrigerant in the refrigerant flow path to the upper part of the rotating electrical machine main body, a second refrigerant discharge section that discharges the refrigerant in the refrigerant flow path to the front part of the rotary electric machine main body, and the second refrigerant. A channel opening / closing means for opening and closing a channel to the discharge unit, and an uphill determination unit that determines whether the vehicle is climbing, and when the uphill determination unit determines that the vehicle is climbing, the channel opening / closing The means is opened to discharge the refrigerant from the second refrigerant discharge portion.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine unit, rotary electric machine, and vehicle which can be cooled at the time of climbing can be provided, without increasing the refrigerant | coolant discharge amount at the normal time.

It is a see-through | perspective perspective view of the hybrid vehicle by which the rotary electric machine unit which concerns on the 1st Embodiment of this invention is mounted. In the rotary electric machine unit which concerns on the said 1st Embodiment, it is a perspective view which shows typically the state by which the refrigerant supply part was arrange | positioned along the circumferential direction of a stator. It is an expanded sectional view of the refrigerant switching mechanism of the rotating electrical machine unit according to the first embodiment. It is a figure explaining the subject of the rotary electric machine unit of a comparative example, (a) is a side view of the drive motor which shows the arrangement | positioning relationship of several refrigerant | coolant supply parts when a vehicle drive | works a flat ground, (b) is a vehicle. It is a side view of the drive motor which shows the arrangement | positioning relationship of several refrigerant | coolant supply parts when driving | running | working uphill. It is a flowchart which shows operation | movement of the rotary electric machine unit which concerns on the said 1st Embodiment. It is a side view of the drive motor which shows the arrangement relation of a plurality of refrigerant supply parts when the vehicles of the rotation electrical machinery unit concerning the 1st embodiment run uphill (uphill road). It is a figure explaining the ON conditions of the switching solenoid of the rotary electric machine unit which concerns on the said 1st Embodiment. It is a flowchart which shows operation | movement of the rotary electric machine unit which concerns on the said 1st Embodiment. It is a figure which shows the threshold value matrix of ON conditions of the switching solenoid of the rotary electric machine unit which concerns on the said 1st Embodiment. It is a perspective view which shows typically the state by which the refrigerant | coolant supply part of the rotary electric machine unit which concerns on the said 1st Embodiment was arrange | positioned along the circumferential direction of a stator. It is a side view of the drive motor which shows the arrangement | positioning relationship of the some refrigerant | coolant supply part when the vehicle of the rotary electric machine unit which concerns on the 2nd Embodiment of this invention drive | works a flat road. It is a side view of the drive motor which shows the arrangement relation of a plurality of refrigerant supply parts when the vehicles of the rotation electrical machinery unit concerning the 2nd embodiment run uphill (uphill road).

Next, a rotating electrical machine unit, a rotating electrical machine, and a vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
(First embodiment)
FIG. 1 is a perspective view of a hybrid vehicle equipped with a rotating electrical machine unit according to a first embodiment of the present invention.
As shown in FIG. 1, the hybrid vehicle 1 includes a driving power source (not shown), a drive motor (rotating electric machine) 21 (see FIG. 2) and a generator (rotating electric machine) (shown). Abbreviation). The drive motor 21 and the generator each have a rotating shaft, and are arranged so that the rotating shafts overlap with each other coaxially. The drive motor 21 and the generator constitute a rotating electrical machine unit 20 mounted on the hybrid vehicle 1.
The hybrid vehicle 1 includes an ECU (Electronic Control Unit) 2 (uphill determination unit), a brake BRKECU 3, an engine ENGECU 4, a throttle actuator 5, a throttle opening sensor 6, and VSC (Vehicle Stability Control). The hydraulic control unit 7, the brake pressure sensor 8, the steering angle sensor 9, the yaw rate sensor 10, the wheel speed sensor 11, and the G sensor 12 that is a three-axis acceleration sensor that detects the inclination of the vehicle body are provided.

  The ECU 2 includes a CPU (Central Processing Unit) and a memory (not shown), executes predetermined arithmetic processing based on the map and program stored in the memory and the detection result of each sensor, and the result of the arithmetic processing Each device of the vehicle is controlled so that the hybrid vehicle 1 is in a desired state. That is, the ECU 2 performs throttle control based on sensor information including the throttle opening sensor 6, the brake pressure sensor 8, the steering angle sensor 9, the yaw rate sensor 10, the wheel speed sensor 11, and the G sensor 12 that detects vehicle acceleration. The actuator 5 and the VSC hydraulic control unit 7 are controlled, and travel control of the entire hybrid vehicle 1 is performed.

The ECU 2 has a function as an uphill determination unit that determines the uphill of the hybrid vehicle 1. When the ECU 2 determines that the hybrid vehicle 1 is going uphill, the ECU 2 opens the refrigerant switching mechanism 35 (flow path opening / closing means) (described later) and releases the refrigerant from the second cooling drip pipe 32 (described later).
The ECU 2 determines an area where the winding temperature of the stator of the rotating electrical machine is high, a low-speed steep climb of the hybrid vehicle 1, or a low-rotation high-torque area of the hybrid vehicle 1, and the hybrid vehicle 1 is in the determination state. The refrigerant switching mechanism 35 is opened to release the refrigerant from the second cooling dripping pipe 32.

The BRK ECU 3 executes ABS (Antilock Brake System) control that optimally controls and distributes the braking force to the wheels, and brake fluid pressure control that is most suitable for the running state. The BRK ECU 3 detects the inclination angle of the road surface on which the hybrid vehicle 1 travels from the output signal of the G sensor 12.
The ENGECU 4 receives vehicle information from the ECU 2 and performs almost all engine control including the transmission.
Note that the BRK ECU 3 and the ENGE ECU 4 may be integrated into the ECU 2.

FIG. 2 is a perspective view schematically showing a state where the refrigerant supply unit 30 is arranged along the circumferential direction of the stator in the rotating electrical machine unit 20.
In FIG. 2, the refrigerant supply unit 30 disposed in the stator 22 of the drive motor 21 is illustrated. However, a generator arranged in parallel with the drive motor 21, a motor housing of the drive motor 21, and a rotor are illustrated. Is omitted.
The drive motor 21 is composed of, for example, a three-phase AC brushless motor, and includes a stator 22 fixed to a motor housing (not shown), a stator holder 23, a stator core 24, and a winding (coil) 25 around which the stator core 24 is wound. Have.
Note that the generator arranged in parallel with the drive motor 21 also has a generator stator, a stator holder, a stator core, and a winding (coil) for winding the stator core having the same configuration as the drive motor 21. In the following description, the stator cooling includes the stator 22 of the drive motor 21 and the generator stator of the generator.

A refrigerant supply unit 30 is provided on the outer periphery of the stator holder 23 of the drive motor 21 and the stator holder (not shown) of the generator.
The refrigerant supply unit 30 includes a plurality of first cooling drip pipes 31a to 31c (first refrigerant discharge units) and a second cooling drip arranged along the circumferential direction of the stator 22 (the direction of arrow C in FIG. 2). The pipe 32 (second refrigerant discharge portion), the first cooling drip pipes 31a to 31c, and the ends of the second cooling drip pipe 32 are attached, and the first cooling drip pipes 31a to 31c and the second cooling drip are dropped. A refrigerant supply pipe 33 (refrigerant flow path) for supplying refrigerant to the pipe 32, a refrigerant inlet 34, and a refrigerant supply pipe 33 between the first cooling drip pipe 31a and the second cooling drip pipe 32; A refrigerant switching mechanism 35 (flow path opening / closing means) that performs switching to flow in or shut off the refrigerant to the second cooling dripping pipe 32; a slope refrigerant flow path 36 that flows the refrigerant into the second cooling dripping pipe 32; Is provided.

The first cooling dripping pipes 31a to 31c discharge the refrigerant in the refrigerant supply pipe 33 (described later) to the upper portion of the rotating electrical machine main body.
The first cooling dripping pipes 31a to 31c are disposed at a predetermined angle along the circumferential direction (the direction of arrow C in FIG. 2) in the upper part of the rotating electrical machine main body (upper part of the stator holder 23). The first cooling dripping pipes 31 a to 31 c are arranged so as to eject the refrigerant to the upper part of the rotating electrical machine main body when the hybrid vehicle 1 travels on flat ground.

The second cooling dripping pipe 32 discharges the refrigerant in the refrigerant supply pipe 33 to the front portion of the rotating electrical machine main body.
The second cooling dripping pipe 32 is disposed along the circumferential direction of the rotating electrical machine main body near the front of the rotating electrical machine body. That is, the second cooling dripping pipe 32 is arranged so that the refrigerant is ejected toward the front of the rotating electrical machine main body when the hybrid vehicle 1 travels uphill.
The first cooling dripping pipes 31 a to 31 c and the second cooling dripping pipe 32 have an outflow hole (ejection hole) 37 through which the refrigerant supplied from the refrigerant supply pipe 33 (refrigerant flow path) flows out toward the winding 25. Is formed.

  By arranging the first cooling dripping pipes 31 a to 31 c along the circumferential direction in the upper part of the rotating electrical machine main body, the refrigerant can be easily supplied to the entire stator 22 including the windings 25 when the hybrid vehicle 1 travels on a flat ground. And can be supplied efficiently.

  On the other hand, the second cooling dripping pipe 32 is arranged in the circumferential direction (the direction of arrow C in FIG. 2) near the front of the rotating electrical machine body in the vehicle direction. The switching solenoid 35 is turned on, and the refrigerant is caused to flow toward the slope refrigerant passage 36 and the second cooling drip pipe 32. When the hybrid vehicle 1 travels uphill, the entire stator 22 is heated by the rotating electrical machine. On the other hand, more refrigerant can be supplied efficiently.

  The refrigerant switching mechanism 35 opens and closes the flow path to the second cooling dripping pipe 32. The refrigerant switching mechanism 35 opens the refrigerant flow path to the refrigerant flow path 36 when climbing by the switching solenoid 35ON. The refrigerant supplied to the refrigerant passage 36 at the time of climbing is discharged from the second cooling drip pipe 32 toward the front of the rotating electrical machine main body.

  The rotating electrical machine unit 20 includes a refrigerant storage unit 40 that stores the refrigerant (ATF), a mechanical oil pump 41 that supplies the refrigerant stored in the refrigerant storage unit 40 to the drive motor 21 and a generator (not shown), And an ATF cooler 42 for cooling the refrigerant sent from the mechanical oil pump 41. The refrigerant reservoir 40, the mechanical oil pump 41, and the ATF cooler 42 are connected to each other via a refrigerant passage 43 (refrigerant passage). The end portion of the refrigerant passage 43 is connected to the motor housing 26 (see FIG. 4) of the drive motor 21.

The refrigerant storage unit 40 accommodates the drive motor 21 and the generator, and functions as a refrigerant case (for example, an oil pan) that stores the refrigerant that has cooled the drive motor 21 and the generator.
The mechanical oil pump 41 circulates refrigerant (ATF), and is a mechanical pump that outputs by a rotational driving force of an engine (not shown) and a rotational driving force of the drive motor 21. Instead of the mechanical pump, for example, an electric pump may be used.

The drive motor 21 and the generator are provided with a refrigerant supply unit 30 that is connected to the end of the refrigerant passage 43 and supplies the refrigerant from the housing side of the rotating electrical machine to the drive motor 21 and the generator.
The refrigerant supply unit 30 is disposed adjacent to the rotating electrical machine unit 20 and cools transmission components (for example, gears and bearings) 44 (not shown) that can be connected to the rotating electrical machine unit 20. In addition, the symbol of resistance in FIG. 2 has shown thermal resistance.

FIG. 3 is an enlarged cross-sectional view of the refrigerant switching mechanism 35 of the rotating electrical machine unit 20.
As shown in FIG. 3, the refrigerant switching mechanism 35 includes a switching solenoid 51 that is turned ON / OFF by a drive signal from the ENGECU 4 (see FIG. 1), and a rod 52 of the switching solenoid 51. A spherical valve element 54 that abuts and a coil spring 55 that urges the valve element 54 in a seating direction. The seating portion 56 on which the valve body 54 is seated is engaged with an upright wall 33 a protruding in the inner diameter direction of the refrigerant supply pipe 33.
When the switching solenoid 51 is OFF, the refrigerant switching mechanism 35 causes the rod 52 to be seated on the seat portion 56 against the refrigerant flow by the spring force of the coil spring 55 (the direction in which the valve is closed). ). As a result, the refrigerant supply pipe 33 is disabled, and the refrigerant does not flow into the uphill refrigerant flow path 36 and the second cooling drip pipe 32 side.
When the switching solenoid 51 is turned on, the refrigerant switching mechanism 35 pushes the rod 52 in the direction in which the valve body 54 is released from the seating portion 56 against the urging force of the coil spring 55 (the direction in which the valve is opened). As a result, the refrigerant supply pipe 33 enters a communication state, and the refrigerant flows into the second cooling drip pipe 32 side via the uphill refrigerant passage 36 via the clearance between the seating portion 56 and the valve body 54. (See arrow in FIG. 3).

Hereinafter, the effect of the rotary electric machine unit 20 comprised as mentioned above is demonstrated.
First, a comparative example will be described.
4A and 4B are diagrams for explaining the problems of the rotating electrical machine unit of the comparative example, and FIG. 4A is a side view of the drive motor showing the arrangement relationship of a plurality of refrigerant supply units when the vehicle travels on a flat ground. ) Is a side view of a drive motor showing an arrangement relationship of a plurality of refrigerant supply units when the vehicle travels uphill. The same components as those in FIG. 2 are denoted by the same reference numerals.
In FIG. 4, the drive motor 21 includes a motor housing 26 and a rotor 28 provided so as to be rotatable integrally with the rotary shaft 27. In FIG. 4A and FIG. 4B, the point O indicates the center of the rotating shaft 27.

For example, when the vehicle travels uphill, a large load (torque) is applied to the drive motor 12 that rotationally drives the drive wheels. For this reason, it is necessary to supply a large current to the drive motor 21. As a result, the amount of heat generated by the winding 25 of the drive motor 21 is larger than that when traveling on flat ground.
Therefore, as shown in FIG. 4A, when the vehicle travels on flat ground, the first cooling drip pipe 31b disposed between the first cooling drip pipe 31a and the first cooling drip pipe 31c is It is set at a position inclined by an inclination angle α (see FIG. 4B) toward the vehicle front side from the vertical line V (see the alternate long and short dash line).

  As a result, as shown in FIG. 4B, when the vehicle is traveling uphill, the vehicle is inclined toward the front of the vehicle by an inclination angle (uphill angle) α of the vehicle when traveling uphill with respect to the vertical line V. It is preferable to set so that the first cooling drip pipe 31b is positioned on the imaginary line L (see the alternate long and short dash line). As a result, the winding 25 of the drive motor 21 that generates a large amount of heat when the vehicle is traveling uphill can be evenly and efficiently cooled by the first cooling drip pipes 31a to 31c.

  However, as shown in FIG. 4B, when the vehicle is traveling uphill, the refrigerant (ATF) flows from the upper part of the stator holder 23, so that the lower part of the drive motor 21 (the front lower part of the stator 22) Only the refrigerant (ATF) warmed by the cooling of the upper part flows. For this reason, the rotating electrical machine is less likely to be cooled on the uphill road than on the flat road.

Next, operation | movement of the rotary electric machine unit 20 which concerns on this embodiment is demonstrated.
FIG. 5 is a flowchart showing the operation of the rotating electrical machine unit 20, which is repeatedly executed by the ECU 2 at a predetermined timing.
First, in step S1, the BRK ECU 3 detects the inclination angle of the road surface on which the hybrid vehicle 1 travels from the output signal of the G sensor 12.
In step S2, the ECU 2 detects the state of the hybrid vehicle 1. Specifically, it is determined whether or not the inclination angle of the hybrid vehicle 1 is equal to or greater than a threshold value. If the inclination angle of the hybrid vehicle 1 is equal to or greater than the threshold value, it is determined that the hybrid vehicle 1 is traveling uphill. The threshold value may include a time determination value. By considering the time determination value, it is possible to exclude the case of the uphill traveling for a short time, and it is possible to avoid the switching operation of the refrigerant switching mechanism 35 more than necessary. However, there are cases where the vehicle repeats uphill traveling and flat ground traveling within a predetermined time. In this case, the winding 25 of the drive motor 21 generates heat as in the case of continuing uphill traveling. For this reason, when introducing the time determination value into the threshold value, it is preferable to consider the accumulated time of uphill traveling within a predetermined time.

If the inclination angle of the hybrid vehicle 1 continues at a threshold value or more, it is determined that the vehicle is traveling uphill, and the ECU 2 outputs a control command for turning on the switching solenoid 51 in step S3.
In step S4, the switching solenoid 51 is turned ON, and the valve body 54 is pushed in a direction in which the valve body 54 is released from the seating portion 56 (a direction in which the valve is opened). Thereby, the refrigerant | coolant supply pipe | tube 33 is made into a communication state, and a refrigerant | coolant flows in into the refrigerant | coolant supply pipe | tube 33 by the side of the 2nd cooling dripping pipe 32 (refer the arrow of FIG. 3).

In step S5, the switching solenoid 51 is turned on, and the refrigerant switching mechanism 35 opens the valve body 54 from the seating portion 56 against the urging force of the coil spring 55 (valve open state). ). As a result, the refrigerant flows into the second cooling dripping pipe 32 via the climbing refrigerant passage 36 (see the arrow in FIG. 3), and from the outflow hole (ejection hole) 37 of the second cooling dripping pipe 32. It injects to the lower part of drive motor 21 (front lower part of stator 22).
In step S6, the front lower part of the rotating electrical machine that is in the heat generation state during the climbing (the lower front part of the stator 22 of the drive motor 21) is cooled, and the process of this flow is finished.

FIG. 6 is a side view of the drive motor showing the arrangement relationship of the plurality of refrigerant supply units when the vehicle of the rotating electrical machine unit according to the present embodiment travels on an uphill (uphill road).
As shown in FIGS. 6 and 2, when climbing up, the switching solenoid 51 is turned on to allow the refrigerant to flow into the uphill refrigerant flow path 36 that is the refrigerant supply pipe 33 on the second cooling drip pipe 32 side. The refrigerant that has flowed into the refrigerant passage 36 at the time of climbing is injected from the outflow hole (ejection hole) 37 of the second cooling dripping pipe 32 to the lower part of the drive motor 21 (lower front part of the stator 22) (FIGS. 6 and 2). (See symbol a). Thereby, it becomes possible to cool the part which wants to cool more directly. By using the uphill refrigerant flow path 36 only during uphill climbing, it is possible to selectively change the manner in which the refrigerant is applied only in situations where cooling is severe during uphill climbing without increasing the amount of refrigerant discharged during normal times.

The ON condition of the switching solenoid 51 will be described in further detail.
FIG. 7 is a diagram for explaining the ON condition of the switching solenoid 51. In FIG. 7, the vertical axis represents vehicle driving force (N) and rotating electrical machine torque (Nm), and the horizontal axis represents vehicle vehicle speed (km / h) and rotating electrical machine rotational speed (rpm).
The region indicated by the circle in FIG. 7 is a region where the winding temperature is high. For example, the winding temperature is high when climbing at a low speed steep slope, that is, in a low rotation high torque region. As an example, when the winding heat generation is severe, the vehicle speed <10 km / h, and the uphill angle> 10 deg, the switching solenoid 51 is turned on.

  In the present embodiment, when the vehicle is in such a region where the winding temperature is high, the refrigerant switching mechanism 35 is switched by the switching solenoid 51ON, the refrigerant flows into the refrigerant channel 36 at the time of climbing, and the second cooling dripping is performed. From the outflow hole (ejection hole) 37 of the pipe 32, it is sprayed to the lower part of the drive motor 21 (front lower part of the stator 22). As a result, it is possible to selectively change the manner in which the refrigerant is applied only in a situation where the cooling during climbing is severe.

FIG. 8 is a flowchart showing the operation of the rotating electrical machine unit. Parts that perform the same processing as in FIG. 5 are assigned the same step numbers, and descriptions of overlapping parts are omitted.
First, in step S1, the BRK ECU 3 detects the inclination angle of the road surface on which the hybrid vehicle 1 travels from the output signal of the G sensor 12.
In step S12, the ECU 2 detects the state of the hybrid vehicle 1 and determines ON / OFF of the switching solenoid 51. Specifically, it is determined whether or not the inclination angle of the hybrid vehicle 1 is greater than or equal to a threshold value, and ON / OFF of the switching solenoid 51 is determined with reference to the threshold value matrix of FIG. 9 based on the vehicle speed condition. As shown in FIG. 9, when the climbing angle <10 deg, the switching solenoid 51 is not turned on regardless of the vehicle speed. When the climbing angle ≧ 10 deg, the switching solenoid 51 is turned on only when the vehicle speed ≦ 10 km / h.
That is, when the vehicle inclination angle is equal to or greater than the threshold value, the switching solenoid 51 is turned on by the following determination.
When both of the following two conditions are met: Vehicle speed ≤ 10 km / h
And uphill angle ≧ 10deg
The switching solenoid 51 is turned on.

If the inclination angle of the hybrid vehicle 1 continues at a threshold value or more, it is determined that the vehicle is traveling uphill, and the ECU 2 outputs a control command for turning on the switching solenoid 51 in step S3.
In step S4, the switching solenoid 51 is turned ON, and the valve body 54 is pushed in a direction in which the valve body 54 is released from the seating portion 56 (a direction in which the valve is opened). Thereby, the refrigerant | coolant supply pipe | tube 33 is made into a communication state, and a refrigerant | coolant flows in into the refrigerant | coolant supply pipe | tube 33 by the side of the 2nd cooling dripping pipe 32 (refer the arrow of FIG. 3).

In step S5, the switching solenoid 51 is turned on, and the refrigerant switching mechanism 35 pushes the rod 52 in the direction to open the valve body 54 from the seating portion 56 against the urging force of the coil spring 55 (the direction in which the valve is opened). . As a result, the refrigerant flows into the refrigerant supply pipe 33 on the second cooling drip pipe 32 side (see the arrow in FIG. 3), and jets the refrigerant to the lower part of the drive motor 21 (lower front part of the stator 22).
In step S6, the front lower part of the rotating electrical machine that is in the heat generation state during the climbing (the lower front part of the stator 22 of the drive motor 21) is cooled, and the process of this flow is finished.

  As described above, the rotating electrical machine unit 20 of the present embodiment has the refrigerant passage 43 and the refrigerant supply pipe 33 that send the refrigerant toward the rotating electric machine main body, and the first refrigerant that discharges the refrigerant in the refrigerant supply pipe 33 to the upper part of the rotating electric machine main body. 1 cooling drip pipes 31a to 31c, a second cooling drip pipe 32 that discharges the refrigerant in the refrigerant supply pipe 33 to the front part of the rotating electrical machine main body, and a refrigerant that opens and closes the flow path to the second cooling drip pipe 32 The switching mechanism 35, a slope refrigerant flow path 36 for flowing the refrigerant into the second cooling dripping pipe 32, and an ECU 2 (uphill determination unit) for determining the uphill of the hybrid vehicle 1, When it is determined that the vehicle 1 is going uphill, the refrigerant switching mechanism 35 is opened, and the refrigerant is discharged from the second cooling dripping pipe 32 through the flow path to the hill-time refrigerant flow path 36.

  With this configuration, the first cooling dripping pipes 31a to 31c (first refrigerant discharge portions) are arranged along the circumferential direction in the upper part of the rotating electrical machine main body, so that the winding 25 is driven when the hybrid vehicle 1 travels on a flat ground. The refrigerant can be easily and efficiently supplied to the entire stator 22 including the.

  On the other hand, the second cooling dripping pipe 32 is disposed along the circumferential direction (the direction of arrow C in FIG. 2) near the front of the rotating electrical machine main body, so that the switching solenoid of the refrigerant switching mechanism 35 in the uphill state. 35 is turned ON, and the refrigerant is caused to flow toward the slope refrigerant channel 36 and the second cooling dripping pipe 32. The refrigerant supplied to the climbing refrigerant passage 36 is discharged from the second cooling drip pipe 32 toward the front of the rotating electrical machine main body, so that the cooling range of the rotating electrical machine main body in the uphill state can be increased. As a result, it is possible to efficiently supply more refrigerant to the entire rotating electrical machine main body when the hybrid vehicle 1 travels on an uphill (uphill road), that is, when the rotating electrical machine generates heat.

  Further, by detecting the tilt state of the hybrid vehicle 1 and the refrigerant switching mechanism 35 switching the flow path to the slope refrigerant flow path 36, it is possible to perform cooling during climbing without increasing the refrigerant discharge amount at the normal time. Become. By using the slope refrigerant flow path 36 only when climbing, the method of applying the refrigerant (ATF) can be selectively changed only in situations where the cooling during climbing is severe. Moreover, it becomes possible to cool the part which wants to cool more directly.

  Further, in the present embodiment, as shown in the flow of FIG. 5, the ON / OFF of the switching solenoid 51 is determined based on the vehicle speed condition with reference to the threshold matrix of FIG. In addition, it becomes possible to selectively cool in the other heat generation state of the rotating electrical machine.

  In the present embodiment, the ECU 2 (uphill determination unit) determines a region where the winding temperature of the stator of the rotating electrical machine is high, a low-speed steep climb of the hybrid vehicle 1, or a low-rotation high-torque region of the hybrid vehicle 1. When the hybrid vehicle 1 is in the determination state, the refrigerant switching mechanism 35 is opened to discharge the refrigerant from the second cooling drip pipe 32 (second refrigerant discharge portion). Thereby, it is possible to selectively cool the rotating electrical machine main body in general, and it is possible to cool the rotating electrical machine main body without increasing the refrigerant discharge amount in the normal state.

(Second Embodiment)
FIG. 10 is a perspective view schematically showing a state in which the refrigerant supply unit of the rotating electrical machine unit according to the second embodiment of the present invention is arranged along the circumferential direction of the stator.
As shown in FIG. 10, the rotating electrical machine unit 20 </ b> A includes a refrigerant supply unit 60 on the outer periphery of the stator holder 23 of the drive motor 21 and the stator holder (not shown) of the generator. The refrigerant supply unit 60 supplies the refrigerant from the housing side of the rotating electrical machine to the drive motor 21 and the generator.
The refrigerant supply unit 60 includes a plurality of first cooling drip pipes 31a to 31c (refrigerant discharge units) arranged along the circumferential direction of the stator 22 (the direction of arrow C in FIG. 10), and the first cooling drip pipe. End portions of 31a to 31c are attached, a refrigerant supply pipe 33 for supplying the refrigerant to the first cooling drip pipes 31a to 31c, a refrigerant introduction port 34, and a first cooling drip pipe 31c for the refrigerant supply pipe 33 (one The refrigerant switching mechanism 65 (flow) is provided at the end of the refrigerant discharge section) (the end of the refrigerant supply pipe 33 on the rear side of the vehicle) and performs switching to flow the refrigerant into or out of the first cooling drip pipe 31c. Road opening and closing means).

  The refrigerant switching mechanism 65 includes a switching solenoid 51. When the switching solenoid 51 is turned on, the rod extends, and a movable piece (not shown) connected to the rod is moved inward of the refrigerant supply pipe 33 to connect the refrigerant supply pipe 33 to the first cooling dripping pipe 31c. Block the flow path.

The first cooling dripping pipes 31a to 31c are disposed at a predetermined angle along the circumferential direction (the direction of arrow C in FIG. 10) at the upper part of the rotating electrical machine main body (upper part of the stator holder 23). The first cooling dripping pipe 31a is disposed on the vehicle front side, and the first cooling dripping pipe 31c is disposed on the vehicle rear side.
When the hybrid vehicle 1 travels on a flat ground, all the three first cooling drip pipes 31a to 31c jet the refrigerant to the upper part of the rotating electrical machine main body.
Further, when the vehicle travels on an uphill, the refrigerant supply to the first cooling drip pipe 31c among the first cooling drip pipes 31a to 31c is interrupted by the refrigerant switching mechanism 65, and the first cooling drip pipe. Only 31a and 31b (other refrigerant discharge parts) eject the refrigerant to the upper part of the rotating electrical machine main body.

  When it is desired to cool the front of the rotating electrical machine (for example, when climbing a slope), the flow rate to the first cooling dripping pipes 31a and 31b in front of the rotating electrical machine is made relatively by closing the flow path of the first cooling dropping pipe 31c behind the rotating electrical machine. Increase the temperature and perform active cooling.

Next, the operation of the rotating electrical machine unit 20A according to this embodiment will be described.
FIG. 11 is a side view of the drive motor showing the arrangement relationship of the plurality of refrigerant supply units when the vehicle of the rotating electrical machine unit 20A according to the present embodiment travels on a flat road.
As shown in FIG. 11, the first cooling dripping pipes 31 a to 31 c (first refrigerant discharge portions) are arranged along the circumferential direction in the upper part of the rotating electrical machine main body, so that the hybrid vehicle 1 travels on a flat ground. All three first cooling drip pipes 31a to 31c eject the refrigerant to the upper part of the rotating electrical machine main body. The refrigerant can be easily and efficiently supplied to the entire stator 22 including the winding 25.

FIG. 12 is a side view of the drive motor showing the arrangement relationship of the plurality of refrigerant supply units when the vehicle of the rotating electrical machine unit 20A according to the present embodiment travels on an uphill (uphill road).
When it is determined that the hybrid vehicle 1 is climbing up, the ECU 2 (uphill determination unit) closes the refrigerant switching mechanism 65 and cuts off the supply of the refrigerant to the first refrigerant discharge unit 31c, and accordingly, the other first cooling is performed. Increase the flow rate of the refrigerant to the drop pipes 31a, 31b.

  As shown in FIG. 12, when it is desired to cool the front of the rotating electrical machine, such as when climbing, the flow rate of the refrigerant to the first cooling drip pipes 31a and 31b is increased by closing the flow path behind the rotating electrical machine. As a result, the flow rate in front of the rotating electrical machine main body can be relatively increased to change the cooling range of the rotating electrical machine body toward the front of the vehicle, and active cooling in front of the rotating electrical machine body can be performed.

  In the present embodiment, since it is not necessary to install the refrigerant channel 36 and the second cooling drip pipe 32 at the time of climbing in the first embodiment, the rotating electrical machine unit 20A can be further simplified.

It should be noted that the present invention is not limited to the above-described embodiments, and it is needless to say that various configurations can be adopted based on the contents described in this specification.
For example, although the hybrid vehicle 1 was mentioned as a cooling structure, if it is a structure which is equipped with a rotary electric machine (motor and generator) and needs to cool this, it will not restrict to this. For example, the hybrid vehicle 1 may be an electric vehicle or a fuel cell vehicle that does not have an engine and uses only a motor as a drive source.

1 Hybrid vehicle 2 ECU (Climbing judgment unit)
3 KECU
4 ENGECU
12 G sensor 20, 20A Rotating electrical machine unit 21 Drive motor (rotating electrical machine)
22 Stator 23 Stator holder 24 Stator core 25 Winding (coil)
26 Motor housing 27 Rotating shaft 28 Rotor 30, 60 Refrigerant supply part 31a to 31c First cooling drip pipe (first refrigerant discharge part, first refrigerant discharge part)
32 Second cooling dripping pipe (second refrigerant discharge part)
33 Refrigerant supply pipe (refrigerant flow path)
34 Refrigerant introduction port 35, 65 Refrigerant switching mechanism (channel opening / closing means)
36 Slope refrigerant flow path 40 Refrigerant reservoir 41 Mechanical oil pump 42 ATF cooler 43 Refrigerant path 51 Solenoid for switching

Claims (8)

A rotating electrical machine unit mounted on a vehicle,
A rotating electrical machine body;
A refrigerant flow path for sending a refrigerant toward the rotating electrical machine body;
A first refrigerant discharge section for discharging the refrigerant in the refrigerant flow path to the upper part of the rotating electrical machine body;
A second refrigerant discharge part for discharging the refrigerant in the refrigerant flow path to the front part of the rotating electrical machine main body;
Channel opening and closing means for opening and closing the channel to the second refrigerant discharge part;
An uphill determination unit for determining uphill of the vehicle,
The climbing judgment unit
When the vehicle is determined to be climbing, the rotating electrical machine unit is configured to open the flow path opening / closing means and discharge the refrigerant from the second refrigerant discharge portion. 2. The rotating electrical machine unit according to claim 1, wherein the second refrigerant discharge unit is disposed at a position where the refrigerant can be discharged near the front of the rotating electric machine main body. The rotating electrical machine unit according to claim 1, wherein a plurality of the first refrigerant discharge portions are arranged in parallel along a circumferential direction of the rotating electrical machine main body. The uphill determination unit further includes:
Determine the region where the winding temperature of the stator of the rotating electrical machine is high, when the vehicle is climbing at a low speed steep slope, or when the vehicle is in the low rotational high torque region. The rotating electrical machine unit according to claim 1, wherein the refrigerant is discharged from the second refrigerant discharge portion. A rotating electrical machine unit mounted on a vehicle,
A rotating electrical machine body;
A refrigerant flow path for sending a refrigerant toward the rotating electrical machine body;
A plurality of parallel arrangements along the circumferential direction of the rotating electrical machine main body, and a refrigerant discharge part that discharges the refrigerant in the refrigerant channel to the upper part of the rotating electrical machine main body,
Channel opening / closing means for opening / closing channels to some of the refrigerant discharge portions of the refrigerant discharge portion;
An uphill determination unit for determining uphill of the vehicle,
The climbing judgment unit
When it is determined that the vehicle is going uphill, the flow path opening / closing means is closed to cut off the supply of the refrigerant to some of the refrigerant discharge parts and the refrigerant to the other refrigerant discharge parts Increased flow rate of rotating electrical machine unit. Some of the refrigerant discharge parts
The rotating electrical machine unit according to claim 5, wherein the rotating electrical machine unit is a refrigerant discharge portion disposed closer to a vehicle rear side of the rotating electrical machine main body. A rotating electrical machine body;
A refrigerant flow path for sending a refrigerant toward the rotating electrical machine body;
A first refrigerant discharge section for discharging the refrigerant in the refrigerant flow path to the upper part of the rotating electrical machine body;
A second refrigerant discharge part for discharging the refrigerant in the refrigerant flow path to the front part of the rotating electrical machine main body;
Channel opening and closing means for opening and closing the channel to the second refrigerant discharge part,
A rotating electrical machine mounted on a vehicle having an uphill determination unit for determining uphill of the vehicle,
The rotating electrical machine characterized in that, when the climbing determination unit determines that the vehicle is climbing, the flow path opening / closing means is opened to discharge the refrigerant from the second refrigerant discharge unit.   A vehicle equipped with the rotating electrical machine unit according to any one of claims 1 to 6.

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