JP5251903B2 - Cooling structure of rotating electric machine - Google Patents

Description

  The present invention relates to a cooling structure for a rotating electrical machine, and more particularly to a cooling structure for a rotating electrical machine in which coil ends of a stator coil protruding outward from both axial ends of a stator core of the rotating electrical machine are cooled by a coolant.

A rotating electrical machine such as an electric motor or a generator mounted on a vehicle such as an automobile includes a rotatable rotor, a stator core provided on an outer peripheral portion of the rotor so as to surround the rotor, and a stator coil wound around the stator core. It is comprised including.
The electric motor is for energizing the stator coil to obtain a rotational force, and the generator is for taking out the current flowing through the stator coil by the rotation of the rotor.

  When a current flows through the stator coil during the rotation of the rotor, the stator core and the stator coil generate heat. Such heat generation affects the magnetic flux penetrating the inside of the electric motor or the generator, and decreases the operation efficiency (rotational efficiency, power generation efficiency). Therefore, it is necessary to cool the rotating electrical machine in order to maintain operating efficiency.

  Such a rotating electrical machine is mounted on a vehicle in a form covered with a case. Therefore, in order to cool the rotating electrical machine, an oil passage is provided in the case, and cooling with oil passing through the passage, that is, liquid cooling is often applied.

As a conventional cooling structure for this type of rotating electric machine, one shown in FIG. 9 is known (for example, see Patent Document 1).
In FIG. 9, a rotating electrical machine 2 is provided in a case 1 of a transaxle of a vehicle. The rotating electrical machine 2 includes a rotor 3 and a stator 4 provided on the outer periphery of the rotor 3 so as to surround the rotor 3. It has.

  The rotor 3 is attached to a shaft 5 extending along the center line of the rotor 3, and the shaft 5 is rotatably supported by the case 1 via a bearing 1a.

  The stator 4 includes a stator core 6 and a stator coil 7 wound around the stator core 6. When the stator coil 7 is energized, a magnetic field is generated. Based on the generated magnetic field, the rotor 3 and the stator 4 The magnetic flux flow is formed between the rotor 3 and the rotor 3 to obtain a rotational force.

  An oil tube 8 is provided inside the case 1 so as to be positioned above the rotating electrical machine 2, and oil that is a coolant flows inside the oil tube 8. The oil tube 8 sucks up oil stored in an oil pan 9 provided in the lower part of the case 1 by an oil pump 10.

  Further, the oil tube 8 is formed with a discharge hole 8a so as to face the coil end 7a of the stator coil 7 protruding outward from both axial ends of the stator core 6, and the oil flowing through the oil tube 8 is discharged from the discharge hole. 8a is discharged to the coil end 7a.

  The oil discharged to the coil end 7a flows down to the lower part of the coil end 7a along the circumferential direction of the coil end 7a having the highest temperature in the stator coil 7, and this oil flows down the coil end 7a. In the meantime, heat is transferred from the coil end 7a to the oil, and the stator 4 is cooled.

  By the way, as a heat countermeasure for the rotating electrical machine 2, it is conceivable to increase the volume of the stator coil 7 to increase the heat capacity. In particular, when the rotating electrical machine 2 is mounted on a vehicle such as an automobile, the rotating electrical machine 2 is used. Since the size reduction of 2 is strongly required, the volume of the stator coil 7 cannot be increased.

  Therefore, it is necessary to cool the rotating electrical machine 2 effectively and efficiently, and in order to realize the effective and efficient cooling of the rotating electrical machine 2, the oil landing rate of the coil end 7 a is increased. There is a need. Here, the oiling rate indicates how much oil applied to the coil end 7a is supplied to the coil end 7a without rebounding at the time of oiling.

That is, when oil is discharged to the coil end 7a to cool the rotating electrical machine 2, when the oil hits the coil end 7a, a part of the oil bounces off from the coil end 7a. The bounced oil is used for cooling the coil end 7a. Therefore, it is necessary to reduce the amount of oil rebound as much as possible to increase the oil landing rate.
As a cooling structure for a rotating electrical machine capable of increasing the oil deposit rate, a structure as shown in FIG. 10 is known (for example, see Patent Document 2).

  In FIG. 10, an oil tube 8A that discharges cooling oil to the coil end 7a is disposed along the rotation axis direction above the uppermost point in the vertical direction L1 of the stator core 6 and the coil end 7a, and from the discharge hole 8a. Oil is discharged to the oil landing point P1 on the outer peripheral surface of the coil end 7a.

The oil tube 8A and the discharge hole 8a are arranged and formed so that oil is incident at an incident angle θ1 of 25 degrees or more and 30 degrees or less with respect to the tangent line L3 at the oil landing point P1.
In this way, oil can be incident on the coil end 7a at an incident angle at which the amount of oil rebounding from the coil end 7a is minimized, so that the oil landing rate of the coil end 7a is maximized. Thus, the rotating electrical machine 2 can be cooled effectively and efficiently.

JP 2006-115650 A JP 2006-115651 A

  However, in such a conventional cooling structure of the rotating electrical machine 2, oil is discharged from the discharge hole 8a of the oil tube 8A to the coil end 7a at an incident angle at which the rebound from the coil end 7a becomes small. The oil incident angle is limited, and it is difficult to supply oil to both side surfaces of the coil end 7a surrounded by a circle a in FIG.

  That is, the conventional cooling structure is not configured to actively supply oil onto the circumferential surface of the coil end 7a by limiting the incident angle of the oil, so that the temperature distribution of the coil end 7a varies greatly. There is a problem that the cooling performance of the rotating electrical machine 2 cannot be sufficiently improved.

  In addition, it is necessary to limit the incident angle of oil, the degree of freedom in setting the discharge hole 8a is reduced, and the work of attaching the oil tube 8A to the case becomes very troublesome.

  The present invention has been made in order to solve the above-described conventional problems, and can freely set the incident angle of the cooling liquid from the cooling liquid discharge means to the coil end while extending in the circumferential direction of the coil end. An object of the present invention is to provide a cooling structure for a rotating electrical machine that can supply a coolant and improve the cooling performance of the rotating electrical machine.

  In order to achieve the above object, the cooling structure for a rotating electrical machine according to the present invention is wound around (1) a rotatable rotor, a stator core provided on the outer periphery of the rotor so as to surround the rotor, and the stator core. A rotating electric machine cooling structure including a stator coil having a stator coil, wherein the rotating electric machine is housed in a case that is located above the rotating electric machine, Cooling liquid discharging means for discharging cooling liquid to the coil ends of the stator coil protruding outward from both axial ends of the stator core, and cooling liquid provided in the case and discharged from the cooling liquid discharging means to the coil ends A coolant storing means for storing the rebound of the coolant, and the coolant storing means is discharged from the coolant discharging means to the coil end. An inlet opening that opens to a position where the coolant rebounds after colliding with the coil end, a storage part that stores the coolant taken in from the inlet opening, and the storage part are formed and stored in the storage part And an outlet opening for supplying the coolant toward the side surface of the coil end.

  In this cooling structure, when the cooling liquid is supplied to the coil end from the cooling liquid discharge means located above the rotating electrical machine, the cooling liquid that collides with the coil end and bounces is stored in the storage portion through the inlet opening. The coolant stored in the part is supplied from the outlet opening toward the side of the coil end.

  For this reason, the coolant bounced off from the coil end is not wasted, and the coolant can be supplied to the side of the coil end in addition to the upper side of the coil end, and the circumferential direction of the coil end is cooled by the coolant. be able to. As a result, the cooling performance of the rotating electrical machine can be improved.

  In addition, it is not necessary to strictly set the incident angle of the coolant from the coolant discharge means to the coil end, so the degree of freedom in setting the coolant discharge means can be improved and the coolant discharge means can be easily installed in the case. Can be installed.

  In the rotating electrical machine cooling structure according to the above (1), (2) the coolant storing means projects the coolant that protrudes from the opening bottom of the inlet opening toward the coil end side and rebounds from the coil end. It is comprised from what has a guide member guided to an entrance opening.

  This cooling structure of the rotating electrical machine has a guide member that protrudes from the bottom surface of the inlet opening toward the coil end side and guides the cooling liquid bounced off from the coil end to the inlet opening. When the peripheral edge of the opening collides and rebounds, the coolant can be guided to the inlet opening by the guide member by dropping the coolant onto the guide member.

  For this reason, it is not necessary to set the position of the inlet opening strictly in the case to supplement the coolant bounced off from the coil end, and the degree of freedom in setting the inlet opening can be improved. Can be easily formed on the case.

  In the cooling structure for a rotating electrical machine according to (1) or (2) above, (3) the case adjacent to the storage section is provided with a cooling means for cooling the coolant stored in the storage section. Has been.

  Since the cooling structure of the rotating electrical machine has a cooling means for cooling the coolant stored in the storage section in the case close to the storage section, the cooling liquid stored in the storage section is cooled by the cooling means, and then the outlet It can supply to the side surface of a coil end from opening, and the cooling performance of a rotary electric machine can be improved further.

In the rotating electrical machine cooling structure described in (3) above, (4) the cooling means is formed of a water jacket.
In the cooling structure of the rotating electric machine, the cooling means is constituted by a water jacket, and therefore the cooling liquid can be reliably cooled by cooling the cooling liquid with the cooling water.

In the cooling structure for a rotating electric machine according to the above (3), (5) the cooling means is composed of a radiating fin that protrudes outward from the case located in the vicinity of the coolant storing means and is exposed to the outside air. It is configured
In this rotating electrical machine cooling structure, the cooling means is composed of radiating fins that protrude outward from the case close to the cooling storage means and are exposed to the outside air. The cooling liquid stored in the part can be cooled, and an inexpensive cooling structure can be obtained.

  According to the present invention, the coolant can be supplied over the circumferential direction of the coil end while freely setting the incident angle of the coolant from the coolant discharge means to the coil end. It is possible to provide a rotating electrical machine cooling structure capable of improving the above.

It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is sectional drawing of the transaxle of a hybrid vehicle. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is the schematic which shows the positional relationship of the coil end and catch tank of the drive motor of FIG. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is the schematic sectional drawing which cut the catch tank part of FIG. 2 in the direction orthogonal to the axial direction of a stator. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is AA direction arrow sectional drawing of FIG. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is BB direction arrow sectional drawing of FIG. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is a figure explaining the flow of the oil supplied to a coil end from an oil pipe. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is sectional drawing of the catch tank which has another structure. It is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention, and is sectional drawing of the catch tank which has another structure. It is a figure which shows the cooling structure of the conventional rotary electric machine. It is a figure which shows the cooling method of the other conventional rotary electric machine.

Embodiments of a cooling structure for a rotating electrical machine according to the present invention will be described below with reference to the drawings.
1-8 is a figure which shows one Embodiment of the cooling structure of the rotary electric machine which concerns on this invention.
First, the configuration will be described.
In FIG. 1, a power transmission device 11 has a transmission case 12 as a casing. In the transmission case 12, a difference between a compound planetary gear device 13 constituting a speed change mechanism and front drive shafts 14L and 14R is provided. A differential device 15 capable of dynamic output, a driving motor 16 as a rotating electrical machine that drives the vehicle with stored electric power, a motor generator 17 that can generate electric power from power from an engine (not shown), and each component of the power transmission device 11 An oil pump 18 for supplying oil as a coolant is accommodated.

  The compound planetary gear device 13 includes a first planetary gear device 19 that transmits the power output from the drive motor 16 and a second planetary gear device 20 that transmits the power output from the engine. The power output from the drive motor 16 and the engine can be selectively transmitted to the differential device 15.

  The transmission case 12 includes a housing 21 that is fastened and supported on the engine side, and a case 22 that is fixed to an opening end of the housing 21 opposite to the engine side.

  A case cover 23 is attached to the opening end of the case 22 opposite to the housing 21 side, and an oil pump cover 24 is attached to the opposite side of the case cover 23 to the case 22 side.

  A housing cover 25 is attached to the housing 21, and the interior of the housing 21 is divided into a storage portion for the motor generator 17 and a storage portion for a damper element 26 that is a driving force transmission mechanism from the engine.

  The housing 21, the case 22, the case cover 23, and the housing cover 25 constitute the transmission case 12, and each storage portion that stores the compound planetary gear device 13, the differential device 15, the drive motor 16 and the motor generator 17. Is formed. The transmission case 12 constitutes a case.

  An input shaft 27 that extends through the motor generator 17 and the second planetary gear device 20 is disposed at the rotation center portion of the motor generator 17 and the second planetary gear device 20. An oil pump drive shaft 28 that extends through the drive motor 16 and the first planetary gear device 19 is disposed at the rotation center portion of the 16 and the first planetary gear device 19.

  One end of the input shaft 27 is integrally engaged with the crankshaft 29 in the rotational direction, and the other end is connected to the second planetary gear unit 20, and power from the engine is supplied to the compound planetary gear unit 13. To communicate.

  One end of the oil pump drive shaft 28 is integrally engaged with the input shaft 27 in the rotational direction, and the other end is connected to the oil pump 18, and transmits power from the input shaft 27 to the oil pump 18. It is like that.

  Further, in the transmission case 12, a counter driven gear 30 and a final drive gear 31 that transmit the power output from the compound planetary gear device 13 to the differential device 15 are provided.

  The counter driven gear 30 meshes with a counter drive gear 32 of the composite planetary gear device 13 described later, and this counter drive gear 32 is spline-coupled to a counter shaft 33 with which a final drive gear 31 is integrally formed.

  The differential device 15 includes a hollow differential case 34, and the differential case 34 is rotatably supported by the case 22 and the housing 21 via bearings 35a and 35b.

  A final gear 36 that meshes with the final drive gear 31 is fastened to the outer periphery of the differential case 34 so that the power output from the compound planetary gear unit 13 is transmitted to the differential case 34 via the final gear 36. It has become.

  A pinion gear shaft 37 is rotatably supported inside the differential case 34, and a pair of differential pinion gears 38 a and 38 b are fixed to the pinion gear shaft 37.

Side gears 39a and 39b are engaged with the differential pinion gears 38a and 38b, respectively, and front drive shafts 14L and 14R are connected to the side gears 39a and 39b, respectively. The front drive shafts 14L and 14R are not shown. Each front wheel is fixed.
Note that the speed reduction by the plurality of gears 38a, 38b, 39a, 39b, the function of the differential device 15 and the like are well-known, and will not be described in detail here.

  The drive motor 16 includes a rotor 41 having a permanent magnet mounted thereon, a three-phase coil 42 as a stator coil, and a stator 44 having a stator core 43 around which the three-phase coil 42 is wound. It is configured as a magnet synchronous motor.

  The rotor 41 is provided integrally with the rotor shaft 45, and the rotor shaft 45 has a through hole 45a formed in the rotation axis direction. The rotor shaft 45 is supported by the case 22 and the case cover 23 via bearings 46a and 46b in a state where the oil pump drive shaft 28 is inserted through the through hole 45a.

  Further, the end of the rotor shaft 45 on the engine side is splined to the sun gear 19a of the first planetary gear device 19, and rotates integrally with the sun gear 19a of the first planetary gear device 19. Yes.

  The motor generator 17 includes a rotor 47 on which a permanent magnet is mounted and a stator 50 having a three-phase coil 48 and a stator core 49 around which the three-phase coil 48 is wound, and is configured as a permanent magnet synchronous motor. Has been.

  The rotor 47 is provided integrally with the rotor shaft 51, and a through hole 51 a is formed in the rotation axis direction of the rotor shaft 51. The rotor shaft 51 is supported by the housing 21 and the housing cover 25 via bearings 62a and 62b in a state where the input shaft 27 is inserted through the through hole 51a.

  The rotor 47 has an end opposite to the engine side that is splined to the sun gear 20a of the second planetary gear unit 20 so that the rotor 47 rotates integrally with the sun gear 20a of the second planetary gear unit 20. It has become.

  The rotors 41 and 47 of the drive motor 16 and the motor generator 17 are arranged with a slight gap between the rotors 41 and 50 and the inner circumferences of the stators 44 and 50, respectively, so that a magnetic field is generated by the rotation of the rotors 41 and 47. It has become.

  The oil pump 18 includes a drive rotor 53 mounted on the oil pump drive shaft 28 and a driven rotor (not shown), and is rotatably supported by the case cover 23.

  In addition, a relief valve 54 is accommodated in the oil pump cover 24, and oil hydraulic control is performed. Then, the oil pumped up by the oil pump 18 is limited to a predetermined set pressure by the relief valve 54, and the power transmission device 11 passes through a plurality of oil passages formed in the oil pump drive shaft 28 and the input shaft 27. It is supplied to each part constituting.

  Oil passages 24a and 23a are formed in the oil pump cover 24 and the case cover 23, respectively, and the oil pumped up by the oil pump 18 is supplied to one end of the oil passage 24a. . The oil supplied to one end of the oil passage 24a is supplied from the other end of the oil passage 24a to one end of the oil passage 23a.

  An oil pipe 55 as a coolant discharge means is connected to the other end of the oil passage 23a, and the oil supplied to one end of the oil passage 23a is supplied from the other end of the oil passage 23a to the oil pipe 55. To be supplied.

  The oil pipe 55 is positioned above the drive motor 16 and extends along the axial direction of the drive motor 16. The oil pipe 55 is fixed to the case cover 23 by a locking member 56 so that one end thereof communicates with the other end of the oil passage 23 a, and the other end is inserted into the through hole 22 a formed in the case 22. The case 22 is fixed by being inserted.

  As shown in FIG. 2, discharge holes 55 a to 55 c are formed in the oil pipe 55, and the discharge holes 55 a and 55 c protrude outward from both axial ends of the stator core 43 and reach the highest temperature. The coil ends 42a and 42b are opposed to each other in the vertical direction, and oil is discharged to the coil ends 42a and 42b.

  Further, the discharge hole 55b is located between the discharge holes 55a and 55c, the discharge hole 55b is opposed to the central part in the axial direction of the stator 44 in the vertical direction, and oil is provided in the central part in the axial direction of the three-phase coil 42. Is to be discharged.

  Further, the discharge holes 55a to 55c are provided below the oil pipe 55, and are provided at three locations, a vertically lower side of the oil pipe 55 and a position inclined with respect to the vertical axis H as shown in FIG. (In FIG. 4, only the discharge hole 55c is shown).

On the other hand, as shown in FIGS. 2 and 3, the case 22 is provided with catch tanks 57 and 58 serving as coolant storing means (in FIGS. 1 and 2, the catch tanks 57 and 58 are attached to the stator 44. The catch tanks 57 and 58 are provided at positions facing the coil ends 42a and 42b.
That is, the catch tanks 57 and 58 are provided in the case 22 so as to be opposed to the coil ends 42a and 42b.

  The catch tanks 57 and 58 are located obliquely above the rotation center of the rotor 41 (rotation center of the rotor shaft 45), and the catch tanks 57 and 58 have inlet openings 57a and 58a for supplementing oil. doing.

  The inlet openings 57a and 58a are opened at positions where oil discharged from the discharge holes 55a and 55c of the oil pipe 55 to the coil ends 42a and 42b rebounds after colliding with the coil ends 42a and 42b.

  The catch tanks 57 and 58 have storage portions 57b and 58b for storing oil introduced through the inlet openings 57a and 58a. The storage portions 57b and 58b are connected to the inlet openings 57a and 58a. It is comprised by the internal peripheral surface of lower catch tank 57,58.

  The catch tanks 57 and 58 include outlet openings 57c and 58c. The outlet openings 57c and 58c are formed on the side surfaces of the storage portions 57b and 58b facing the coil ends 42a and 42b. The outlet openings 57c and 58c supply oil stored in the storage portions 57b and 58b of the catch tanks 57 and 58 toward the side surfaces of the coil ends 42a and 42b.

  The bottom surface 57d of the storage portion 57b is an inclined surface that is inclined downward toward the coil end 42a side, and the outlet opening 57c is formed on the side surface of the storage portion 57b on the bottom surface 57d side. . For this reason, the oil discharged from the outlet opening 57c is directed to the side surface of the coil end 42a.

  The bottom surface 57d of the storage portion 57b of the catch tank 57 has the same shape as the bottom surface 58d of the storage portion 58b of the catch tank 58. For this reason, the oil discharged from the outlet opening 57c is directed to the side surface of the coil end 42b.

  As shown in FIGS. 3 and 5, a water jacket 59 as a cooling means is formed in the case 22, and the water jacket 59 is adjacent to the catch tanks 57 and 58. Further, as shown in FIG. 5, the water jacket 59 is formed with a predetermined length with respect to the case 22 over a range including the catch tanks 57, 58 and is filled with cooling water. A space is defined.

  A cooling water supply hole 59a is formed in the water jacket 59, and one end of a cooling water supply pipe 60 through which the cooling water cooled by the radiator flows is attached to the cooling water supply hole 59a.

  The water jacket 59 is formed with a cooling water discharge hole 59b. The cooling water discharge hole 59b is attached to one end of a cooling water discharge pipe 61 for discharging the cooling water in the water jacket 59. Yes.

  Therefore, the oil in the catch tanks 57 and 58 can be cooled by the cooling water supplied from the cooling water supply pipe 60 to the water jacket 59 via the cooling water supply hole 59a. Further, the cooling water heat-exchanged with the oil in the catch tanks 57 and 58 is discharged from the water jacket 59 to the cooling water discharge pipe 61 through the cooling water discharge hole 59b.

Next, a method for cooling the drive motor 16 will be described.
When the oil is pumped up by the oil pump 18, the oil is supplied to the oil pipe 55 through the oil passages 24a and 23a. The oil supplied to the oil pipe 55 is discharged from the discharge holes 55a and 55c toward the coil ends 42a and 42b, and is discharged from the discharge hole 55b to the central portion in the axial direction of the three-phase coil 42.

  The oil supplied to the coil ends 42a and 42b, which is the highest temperature in the drive motor 16, collides with the coil ends 42a and 42b, but the discharge holes 55a to 55c are vertically below the oil pipe 55 ( Since the oil is discharged from the discharge holes 55a and 55c inclined with respect to the vertical axis H, the oil discharged from the discharge holes 55a and 55c inclined with respect to the vertical axis H is shown in FIG. As shown in FIG. 2, the coil ends 42a and 42b collide with the upper right and upper left sides of the coil ends 42a and 42b, and flow down to the lower portions of the coil ends 42a and 42b along the circumferential direction of the coil ends 42a and 42b.

  And while this oil flows down the coil ends 42a and 42b, heat is transmitted from the coil ends 42a and 42b to the oil, and the stator 44 is cooled.

  On the other hand, as shown by the arrows in FIG. 6, a part of the oil colliding with the coil ends 42a, 42b obliquely upward to the right collides with the coil ends 42a, 42b, bounces off, and catch tanks 57, (In FIG. 6, only the catch tank 58 is shown, but the oil flow in the catch tank 57 is also the same as that of the catch tank 58).

  Further, the oil stored in the storage portions 57b and 58b is cooled by the cooling water flowing through the water jacket 59, and is always in a low temperature state. The low-temperature oil stored in the catch tanks 57 and 58 is supplied toward the sides of the coil ends 42a and 42b from the outlet openings 57c and 58c as indicated by arrows.

  That is, the cooling structure of the present embodiment is provided in the case 22 so as to be positioned above the drive motor 16, and is provided in the case 22 and the oil pipe 55 that discharges oil to the coil ends 42 a and 42 b. And catch tanks 57 and 58 for storing the rebound of oil discharged from the oil pipe 55 to the coil ends 42a and 42b. The catch tanks 57 and 58 are discharged from the oil pipe 55 to the coil ends 42a and 42b. Formed in inlet openings 57a, 58a that open to positions where oil rebounds after colliding with coil ends 42a, 42b, reservoirs 57b, 58b that store oil taken from inlet openings 57a, 58a, and reservoirs 57b, 58b The oil stored in the reservoirs 57b and 58b is supplied to the coil ends 42a and 42b. Outlet opening 57c for supplying toward the side of, and and a 58c.

  Therefore, the oil bounced off from the coil ends 42a and 42b is not wasted, and oil can be supplied to the side surfaces of the coil ends 42a and 42b in addition to the upper portions of the coil ends 42a and 42b. The circumferential direction of 42b can be cooled by oil. As a result, the cooling performance of the drive motor 16 can be improved.

  Further, in the present embodiment, since it is not necessary to strictly set the incident angle of oil from the oil pipe 55 to the coil ends 42a and 42b as in the prior art, the oil including the site where the discharge holes 55a and 55c are formed is included. The degree of freedom in setting the pipe 55 can be improved, and the oil pipe 55 can be easily installed in the case 22.

  Moreover, in this Embodiment, since the water jacket 59 which cools the oil stored by the storage parts 57b and 58b is provided in the case 22 adjacent to the catch tanks 57 and 58, it was stored by the storage parts 57b and 58b. Oil can be reliably cooled with cooling water and supplied from the outlet openings 57c and 58c to the side surfaces of the coil ends 42a and 42b, and the cooling performance of the drive motor 16 can be further improved.

  In the present embodiment, the oil stored in the storage portions 57b and 58b is cooled by the cooling water, but not limited to this, as shown in FIG. A heat radiating fin 71 may be provided as a cooling means that protrudes outward from the case 22 and is exposed to the outside air. The catch tank 57 is also provided with heat radiating fins 71 as in the catch tank 58.

  In this case, the oil stored in the storage portions 57b and 58b can be cooled with a simple configuration by simply providing the radiation fins 71 in the case 22, and an inexpensive cooling structure can be obtained. An increase in the manufacturing cost of the power transmission device 11 can be prevented.

  Further, as shown in FIG. 8, a guide member 81 that constitutes a part of the coolant storing means may be provided on the opening bottom of the inlet opening 58a. A guide member 81 similar to the inlet opening 58a is provided in the inlet opening 57a of the catch tank 57.

  As shown in FIG. 8, the guide member 81 protrudes from the opening bottom of the inlet opening 58a toward the coil end 42a, and the guide member 81 guides the oil bounced from the coil end 42a to the inlet opening 58a. It is like that.

  When the guide member 81 is provided on the bottom surface of the inlet openings 57a and 58a as described above, the oil is guided when the oil bounced from the coil ends 42a and 42b collides with the peripheral edge of the inlet openings 57a and 58a and bounces back. By dropping the member 81, the guide member 81 can guide the inlet openings 57a and 58a (the flow of oil is indicated by arrows a to c).

  For this reason, it is unnecessary to set the positions of the inlet openings 57a and 58a in the case 22 in order to supplement the oil bounced from the coil ends 42a and 42b, and the degree of freedom in setting the inlet openings 57a and 58a is improved. The catch tanks 57 and 58 can be easily formed in the case 22.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the cooling structure for a rotating electrical machine according to the present invention supplies the coolant over the circumferential direction of the coil end while freely setting the incident angle of the coolant from the coolant discharge means to the coil end. And the cooling performance of the rotating electrical machine can be improved, and the coil ends of the stator coil protruding outward from both axial ends of the stator core of the rotating electrical machine are cooled by the coolant. It is useful as a cooling structure for rotating electrical machines.

12 Transmission case (case)
16 Drive motor (rotary electric machine)
41 Rotor 42 Three-phase coil (stator coil)
42a, 42b Coil end 43 Stator core 44 Stator 55 Oil pipe (cooling liquid discharge means)
57, 58 Catch tank (coolant storage means)
57a, 58a Inlet opening 57b, 58b Reservoir 57c, 58c Outlet opening 59 Water jacket (cooling means)
71 Radiation fin (cooling means)
81 Guide member

Claims (5)

A rotating electrical machine cooling structure comprising a rotatable rotor, a stator core provided on an outer peripheral portion of the rotor so as to surround the rotor, and a stator having a stator coil wound around the stator core. ,
A case for housing the rotating electrical machine;
A coolant discharge means that is provided in the case so as to be positioned above the rotating electrical machine, and that discharges the coolant to the coil ends of the stator coil protruding outward from both axial ends of the stator core;
Provided with the case, and provided with a coolant storing means for storing a rebound portion of the coolant discharged from the coolant discharging means to the coil end,
The coolant storing means stores an inlet opening that opens to a position where the coolant discharged from the coolant discharging means to the coil end rebounds after colliding with the coil end, and stores the coolant taken in from the inlet opening. And an outlet opening that is formed in the storage portion and supplies the coolant stored in the storage portion toward the side surface of the coil end. Construction.   2. The cooling liquid storing means includes a guide member that projects from the bottom surface of the inlet opening toward the coil end side and guides the cooling liquid bounced off from the coil end to the inlet opening. The rotating electrical machine cooling structure described in 1.   The cooling structure for a rotating electrical machine according to claim 1, wherein the case adjacent to the storage unit includes a cooling unit that cools the coolant stored in the storage unit.   4. The cooling structure for a rotating electric machine according to claim 3, wherein the cooling means comprises a water jacket.   4. The cooling structure for a rotating electrical machine according to claim 3, wherein the cooling unit includes a radiating fin that protrudes outward from the case located in the vicinity of the coolant storing unit and is exposed to the outside air.

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