JP3385373B2 - Motor cooling circuit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor cooling circuit, and more particularly to a cooling circuit suitable for cooling a motor of an electric vehicle drive device.

[0002]

2. Description of the Related Art As a technique for cooling a motor with oil,
In Japanese Unexamined Patent Publication No. 6-98417, the oil discharged from the oil pump is supplied to a ring-shaped oil chamber formed in a jacket shape on the upper side in a drive device case that houses a motor, and the supplied oil is supplied to the ring-shaped oil chamber. A cooling device for a motor is disclosed in which the cooling is performed by injecting the air from an injection port formed directly on the inner peripheral wall to a coil end portion of the motor for cooling.

[0003]

By the way, since the injection port in the above-described conventional cooling device is formed by the process of making a hole from the inner peripheral side of the case toward the annular oil chamber,
Due to processing restrictions, the axis of the injection port was an oblique hole inclined with respect to the axis of the case, and the hole diameter could not be extremely reduced. For this reason, when the amount of oil discharged from the oil pump is small and sufficient injection pressure cannot be secured, the oil supplied to the injection port will not be vigorously injected from the injection port, resulting in poor disconnection from the inner wall surface of the case. As a result, the oil flows downward through the inner surface of the drive device case wall, and the oil is formed in the lower portion of the drive device case without coming into contact with the coil end of the motor. There is a problem that it is difficult to cool the coil end efficiently.

Further, since it is difficult to reduce the hole diameter of the injection port, the pressure drop in the cooling oil passage is directly reflected in the injection oil amount, and the injection oil amount from the injection port located on the upstream side is transmitted from the injection port on the downstream side. There is also a problem that the amount of injected oil tends to be larger than that of No. 1, and it becomes difficult to make the amount of injected oil uniform for each injection port, resulting in a difference in cooling balance.

The present invention has been devised in view of the above circumstances, and even when the discharge amount of the oil pump is small,
It is a general object to provide a motor cooling circuit capable of surely cooling a motor coil. next,
A more specific object of the present invention is to effectively supply oil to the motor coil when the amount of oil discharged from the oil pump is small in the cooling circuit. A further object of the present invention is to make the discharge oil amount uniform for each injection port in the cooling circuit.

[0006]

[Means for Solving the Problems] To achieve the above object.
Therefore, according to the present invention, a cylindrical core fixed to the inside of the peripheral wall of the case and having a plurality of slots formed on the inner periphery thereof, a coil wound around the plurality of slots of the core, and both end portions of the core are provided. A stator having first and second coil ends formed in the circumferential direction, and a rotor arranged radially inward of the stator and rotatably supported by the case. A cooling circuit having an oil pump, an oil pump, and a supply oil passage for supplying the oil discharged from the oil pump to the upper portion of the motor. First and second cooling oil injection parts are respectively provided on the upper part of the second coil ends, and each of the first and second cooling oil injection parts is formed on the injection surface and the injection surface. An injection port for injecting oil supplied from an oil passage, wherein the supply oil passage is the oil A first oil passage for guiding the discharged oil is supplied to the first injection port of the first cooling oil injection unit from pump,
A second oil passage that is connected to the first oil passage and guides the supplied oil to the injection port of the second cooling oil injection unit, and an oil that is connected to the second oil passage and is supplied The second of the first cooling oil injection unit
It is characterized by having a third oil passage leading to the injection port of.

Further, according to the present invention, a cylindrical core fixed to the inside of the peripheral wall of the case and having a plurality of slots formed on the inner periphery thereof, and a coil wound around the plurality of slots of the core,
First and second circumferentially formed ends of the core
A motor having a coil end and a rotor rotatably supported by the case, the rotor being disposed radially inward of the stator, the oil pump, and the oil. A cooling circuit having a supply oil passage for supplying oil discharged from a pump to the upper portion of the motor, the cooling circuit comprising a shaft formed in the wall of the case above the core. Direction oil passages, and first and second cooling oil injection members axially abutting the case above the first and second coil ends. Each of the cooling oil injection members is formed along a contact surface with the case and is connected to the axial oil passage, an injection surface, and a plurality of injection ports formed on the injection surface. And a plurality of injection oil passages that connect the plurality of injection ports to the groove, and the supply oil passage includes the first and second injection oil passages. Characterized in that it is connected to either one of the injection fluid path of the cooling oil jet member.

Further, according to the present invention, a cylindrical core fixed to the inside of the peripheral wall of the case and having a plurality of slots formed on the inner circumference thereof, and a coil wound around the plurality of slots of the core,
First and second circumferentially formed ends of the core
A motor having a coil end and a rotor rotatably supported by the case, the rotor being disposed radially inward of the stator, the oil pump, and the oil. A cooling circuit having a supply oil passage for supplying oil discharged from a pump to the upper part of the motor, the cooling circuit being formed in the wall of the case above the core. Axial oil passages and first and second axially abutting upper portions of the first and second coil ends to the case.
A cooling oil injection member, wherein the first cooling oil injection member has an injection surface, a plurality of injection ports formed on the injection surface,
The second cooling oil injection member has a plurality of injection ports and a plurality of injection oil passages connected to each of the plurality of axial oil passages, and the second cooling oil injection member extends along a contact surface with the case. Groove formed to connect to the plurality of axial oil passages of the case, an ejection surface, a plurality of ejection openings formed on the ejection surface, and a plurality of connection portions connecting the plurality of ejection openings and the groove. An injection oil passage, and the supply oil passage is connected to one of a plurality of injection oil passages of the first cooling oil injection member.

[0009]

[Action and Effect of the Invention The arrangement according to the claim 1
According to this, the oil discharged from the oil pump is supplied to the first injection port of the first cooling oil injection member and is injected to the first coil end. Then, the surplus oil is supplied to the injection port of the second cooling oil injection unit via the second oil passage, and is injected to the second coil end. Further, the surplus oil of the second cooling oil injection unit is supplied to the second injection port different from the first injection port of the first cooling oil injection member via the third oil passage, It is injected to the first coil end. In this way, the first cooling oil injection unit injects a small amount and supplies it to the second cooling oil injection unit, and the surplus oil is returned to the first cooling oil injection unit. It is possible to equalize the amount of oil that is supplied to the cooling oil injecting units and is ejected from those injection ports.

Furthermore, according to the second and third aspects, the injection port is formed in the cooling oil injection member separate from the case, so the injection port is formed directly on the inner wall of the case. Drilling is easier and easier than in the case. As a result, it is possible to optimize the hole diameter and number of the injection ports and make the injection balance uniform for each injection port. Further, particularly according to the structure described in claim 3 , the injection balance can be further improved for the same reason as in the structure described in claim 1 .

[0011]

EXAMPLES The present invention will be described below with reference to the examples shown in the drawings. 1 to 3 conceptually show a first embodiment, which is a cylindrical core 2 fixed to the inside of a peripheral wall of a case 10 and having a plurality of slots formed on the inner periphery thereof.
12, a coil 213 wound around a plurality of slots of the core 212, a stator 21 having a coil end 211 circumferentially formed at an end of the core 212, and a stator 2
1, which is arranged on the inner side in the radial direction of 1, and is provided with a motor 2 including a rotor 22 rotatably supported by the case 10.
Further, it is provided with an oil pump 5 driven by appropriate means, and a cooling circuit 6 having a supply oil passage 63 for supplying the oil discharged from the oil pump 5 to the upper part of the motor 2.

In the present example, as shown in FIG. 2, the cooling circuit 6 injects oil supplied from the oil supply passage 63, which is formed on the flat injection surface 81 facing the coil end 211 and the injection surface 81. The cooling oil jetting unit 8 having the jetting port 82 is provided so that the jetting surface 81 is discontinuous with respect to the inner surface 101 of the peripheral wall of the adjacent case 10. The end portion 83 is positioned above the coil end 211, as shown in FIG. In this example, as shown in FIG.
First and second coil ends 21 located at both ends of
1a and 211b, corresponding to the first and second cooling oil injection units 8a and 8b (hereinafter, in the description of the embodiment, the first and second cooling oil injection units and their respective parts). Will be described by adding the symbols a and b to the end of the numeral symbols only when it is necessary to distinguish them.) Both cooling oil injection parts 8 are connected to the axial oil passage 1 formed in the case 10.
It is connected with 02.

In the cooling circuit 6 configured in this way,
When the amount of oil discharged from the oil pump 5 is large, the oil supplied from the oil supply passage 63 is transferred to the coil end 21 of the cooling oil injection unit 8.
The oil is jetted vigorously from the jet port 82 formed on the jet surface 81 facing 1 and oil is directly supplied to the coil end 211. On the other hand, when the amount of oil discharged from the oil pump 5 is small,
The oil is not vigorously ejected from the ejection port 82, the distance from the ejection surface 81 of the cooling oil ejection unit 8 deteriorates, the oil adheres to the ejection surface 81 and stops, and when the oil exceeds a certain amount, the oil droplets drop. And fall. At this time, the injection surface 81 is arranged so as not to be flush with the inner surface 101 of the peripheral wall of the case 10, and the end portion 83 of the injection surface 81 is arranged above the coil end 211, so that the oil is injected into the injection surface. From any position of 81, drops are dropped from the axial end portion and the circumferential end portion 83 to the coil end 211 even at the outermost side. Therefore, oil can be reliably supplied to the coil end 211 even when the discharge amount of the oil pump 5 is small.

Next, FIGS. 4 and 5 conceptually show a second embodiment. In this device, the cooling oil injection portion 8 is formed integrally with the peripheral wall portion of the case 10. The injection surface 81 in this example is a flat surface that is oriented in a direction that intersects the axis of the coil, and therefore the axis of the injection port 82 is also formed so as to be parallel or intersect with the axis of the coil end 211 at an acute angle. The ejection surface 81 integrated with the wall surface of the case 10 has a notch 103 in the axial direction on the inner peripheral surface of the case peripheral wall.
Is formed, it is discontinuous from the inner surface of the peripheral wall and is provided with the end portion 83. Therefore, the ejection surface 81 and the inner surface of the peripheral wall of the case 10 adjacent thereto are isolated from each other. Also in this example, the end portion 83 is located above the coil end 211.

Also in the cooling circuit thus configured, when the amount of oil discharged from the oil pump 5 is small, the oil injected from the injection port 82 travels along the wall surface of the case 10 and the cutout portion 1
It drops from 03 and falls to the coil end 211. Similar to the conventional one, the feature of this embodiment is that the injection port 82 is directly formed on the case 10, but its axis is substantially parallel to the axis of the case 10. Therefore, the process is relatively easy. There is a point. Such an advantage can be obtained by forming the notch 103 so that the case wall and the ejection surface 81 are isolated from each other, so that the ejection port 82 does not have to be directed downward.

Next, FIG. 6 conceptually shows a third embodiment, in which the ejection surface 81 in the apparatus of the first embodiment is an inclined surface. The ejection surface 81 in this example is a concave cylindrical surface, and has a circumferential end portion 83, one of which is long and the other of which is short in the rotor rotation direction with respect to the uppermost portion of the case wall. The ejection port 82 is formed at a position slightly lower than the uppermost portion of the ejection surface 81. In such a configuration, the longer circumferential end does not necessarily have to be located above the coil end 211. This is because the oil flowing out from the injection port 82 and flowing along the ejection surface 81 does not flow over the uppermost portion of the ejection surface 81 and to the peripheral surface on the opposite side.

With this configuration, when the amount of oil discharged from the oil pump 5 is large, oil is directly supplied from the injection port 82 to the coil end 211 by injection, and even if the amount of oil discharged from the oil pump 5 is small, the oil is injected. The oil that has flowed out of the mouth 82 without being jetted flows along the jetting surface 81 in a downwardly inclined direction of the jetting surface 81, and forms a discontinuous corner portion with respect to the inner peripheral surface of the case 10. 81 end 8
When the toner stays at 3 and reaches a predetermined amount, it becomes an oil drop due to gravity and falls on the coil end 211. Thus, also in this example, it is possible to prevent the circulation of the oil from the injection port 82, which does not serve to cool the coil that flows down the case along the inner peripheral surface of the case 10.

Next, FIGS. 7 to 13 show a fourth embodiment in which the cooling circuit conceptually described above is applied to a motor of a drive device for an electric vehicle and is embodied. As shown in the axial sectional view of FIG. 6, this electric vehicle drive device 1 includes a case 1 divided into a motor case 10m and a gear case 10g.
Stator 21 fixed to the 0m motor case 10m side
And a rotor 22 arranged radially inside the stator 21.
And a pair of ball bearings 16 and 18 which are spline-connected to the rotor 22 and support radial and thrust forces.
A motor 2 having a rotor shaft 23 rotatably supported by a motor case 10m, and a planetary gear 3 coaxially arranged with the rotor shaft 23 on the gear case 10g side for decelerating and outputting the rotation of the motor 2, and a planetary gear. One of the outputs of the motor 3 is passed through the rotor shaft 23, and the other is directly transmitted to the left and right drive wheels of the vehicle.

As shown in FIG. 12, the planetary gear 3 includes a sun gear 31 connected to the rotor shaft 23, a ring gear 32 fixed to the gear case 10g to prevent radial play, and a ring gear 32 fixed on the motor case 10m. The sun gear 3 is rotatably supported by the center support 108.
1 and a pinion 33 meshing with the ring gear 32 are rotatably supported, and have a carrier 34 connected to the differential device 4. The sun gear 31 is disposed with its end portion in contact with the rotor shaft 23, and is connected to each other by a sleeve 25 by spline fitting.

The differential gear 4 is a pair of differential gears arranged in a differential gear case 40, which is composed of a portion integrated with the carrier 34 of the planetary gear 3 and a portion bolted to the carrier 34 separately. A large gear 41 and a plurality of differential small gears 43 that are meshed with these and are loosely fitted to a differential small gear shaft 42 pinned to the differential gear case 40 are provided. The rotor shaft 23 is passed through the shaft hole and the differential device 4
One end of the drive shaft 11 that transmits one output to one drive wheel via the yoke shaft 12a (shown by an imaginary line in the drawing) is spline-fitted and snap-ring fixed, and the other end of the differential large gear 41 is A yoke shaft 12b, which also serves as a drive shaft for directly transmitting the other output of the differential device 4 to the other drive wheel, is spline-fitted and snap-locked in the shaft hole. The shaft portion formed on one portion of the differential gear case 40 is connected to the gear case 10g via the ball bearing 15.
The other part, which is supported by the support part of the outer end wall of the motor and is integrated with the carrier 34, supports the shaft part formed on the carrier 34 by the center support 108 of the motor case 10 m via the ball bearing 13. .

In FIG. 7, reference numeral 19 denotes a connecting sleeve for spline-connecting the drive shaft 11 to the yoke shaft 12a. The outer periphery of the sleeve 19 is connected to the outer end of the motor case 10m via a ball bearing 17. Is supported by the lid, and the outer circumference of the inner end side is supported by the inner circumference of the rotor shaft 23 via the needle bearing 20. Further, reference numeral 26 is a power cable for supplying three-phase AC power to the motor 2, 27 is a parking gear, and 104 is a cooling fin that is formed to project in large numbers on the outer peripheral surface of the motor case 10 m and allows heat of the motor 2 to escape directly to the atmosphere. .

In the drive device for an electric vehicle configured as described above, the cooling circuit according to the present invention includes the motor 2
However, this cooling circuit is partially shared with a lubricating circuit for lubricating the above-mentioned drive device parts. The oil pump 5 as a common hydraulic source for supplying oil to these two circuits is disposed in the center support 108 of the motor case 10m. In this example, the pump is operated by the motor 2 so that the oil pump A gear 51 integrated with the pump shaft 50 is meshed with an outer peripheral gear 24 formed on the sleeve 25 via counter gears 52 and 53. Reference numeral 9 indicates a resolver connected to the oil pump shaft 50 to detect the rotational position of the rotor 22.

The oil sump for collecting the lubricating and cooling oil is formed in the lower part of the gear case 10 g, and the lower part thereof is closed by an oil pan 105. A valve body 7 incorporating an oil strainer and a relief valve is arranged above the oil sump. The motor case 10m and the gear case 10g communicate with each other through a window 106 that penetrates the center support 108 of the motor case 10m at the lower side. The oil pump 5 and the valve body 7 have a center support 108.
A suction oil passage (not shown) and a discharge oil passage (not shown) formed in the wall of the are connected.

The oil discharged from the oil pump 5 is
In this example, the supply oil passage 63 supplied to the upper part of the engine 2 is connected to the discharge oil passage connecting the oil pump 5 and the valve body 7, the branch oil passage in the valve body 7, and the oil passage. The oil passages in the gear case 10g and the motor case 10m, and the pipe 63p whose proximal end side is connected to the oil passages (see FIG. 8).
See). And the cooling circuit is the core 2
It has an axial oil passage 102 formed at the uppermost portion in the wall of the reduced diameter portion of the peripheral wall of the motor case 10m that supports the outer periphery of 12. First and second coil ends 211a, 211
First and second cooling oil injection members 8a and 8b, which are separate from the case that is axially abutted on the end surface of the reduced diameter portion of the motor case 10m, are bolted to the upper portion of b.

As shown in detail in FIG. 10, the first cooling oil injection member 8 a has three axially extending portions that branch from the circumferentially extending portion 84 of the member and extend in the axial direction in the shape of comb teeth. The ejection surface 81 constituted by the lower surface of the portion 85, and the ejection surfaces 81
And the three injection oil passages 86 that connect the injection ports 82 of each axial direction row to each other. The respective injection oil passages 86 are connected to each other by an upwardly convex circumferential groove 87 formed on an end surface of the circumferentially extending portion 84 which comes into contact with the motor case. Similarly, the second cooling oil injection member 8b is also formed along the contact surface with the motor case and has an upwardly convex circumferential groove 87 which is connected to the axial oil passage 102, and the axial direction similar to the above. The ejection surface 81 formed by the lower surface of the extended portion 85, the ejection ports 82 for the three, which are also formed on each ejection surface 81, and the connection between the ejection port 82 and the circumferential groove 87. And the injection oil passage 86 of the strip. The reference numeral 89 indicates a brim that extends in the axial direction from the circumferentially extending portion 84 and is abutted against the inner peripheral surface of the motor case.

Cooling oil injection member 8 configured as described above
As shown in FIG. 8, the supply pipe 63p constituting the supply oil passage is different from the first and second cooling oil injection members 8a and 8b.
One of the plurality of injection oil passages 86 of a, that is, the central injection oil passage 8
It is connected to 6.

FIG. 11 shows two cooling oil injection members 8 a,
8b is a circuit diagram showing a connection relationship of a cooling oil passage formed by 8b and an axial oil passage 102 of the motor case.
As is clear from the oil passage arrangement in the figure, in this example, the rows of the injection ports 82 for each three in the cooling oil injection member 8a are supplied except for the central injection oil passage 86 connected to the supply oil passage 63. The cooling oil injection member 8 b is arranged in parallel with the oil passages, and the injection oil passages in the cooling oil injection member 8 b are arranged in parallel with each other except for the central injection oil passage 86 connected to the axial oil passage 102.

In the electric vehicle drive device 1 configured as described above, the rotation of the rotor 22 of the motor 2 is transmitted from the rotor shaft 23 to the sun gear 31 via the sleeve 25. The rotation transmitted to the sun gear 31 is applied to the ring gear 32.
As a revolution of the pinion 33 that takes the reaction force of the rotation, the differential case 40 integrated with it is taken out by the carrier 34 and rotated. The rotation of the differential gear case 40 passes through the differential small gear shaft 42 and the differential small gear 43 loosely fitted thereto, and is the rotation of the drive shaft 11 spline-fitted from the differential large gear 41 on the other hand, On the other hand, the differential gear 41
After that, the yoke shaft 12b fitted to the spline is rotated, and finally transmitted to the left and right drive wheels (not shown),
It is used as the driving force of the vehicle.

During operation of such an electric vehicle, the oil sucked from the oil sump through the oil strainer to the oil pump 5 via the suction oil passage is discharged from the oil pump 5 and discharged to the valve body 7 once via the oil passage. Returned there, separated from the lubricating oil passage to reach the supply pipe 63p through the oil passage in the case, and then supplied to the member by the central injection oil passage 86 of the first cooling oil injection member 8a.
Is ejected from each of the ejection ports 82 to the first coil end 211a. Then, the surplus oil is divided into three in the circumferential groove 87, the flow along the circumferential groove 87 reaches the injection oil passages 86 on both sides, and similarly from the respective injection ports 82 of the oil passage to the first coil end. Is injected into. From the circumferential groove 87 to the axial oil passage 102
The surplus oil that has reached the circumferential groove 87 of the second cooling oil injection member 8b via the shunt is further divided into three in the groove, and each of the injection oil passages 8
6, and is injected from each injection port 82 of the oil passage to the second coil end 211b.

In this example, since the injection port 82 is formed in the cooling oil injection member 8 which is separate from the motor case 10m, compared to the case where the injection port is directly formed on the inner wall of the case,
Drilling is simple and easy. As a result, it is possible to make the injection balance uniform for each of the injection ports 82 by optimizing the hole diameter and number of the injection ports 82 and decreasing the hole diameter toward the oil passage upstream side. In addition, in this example, since the injection oil passages 86 are connected by the upwardly projecting circumferential groove 87, the injection oils located on the downstream side with respect to the supply oil passage 63 and the injection oil passages located on the upstream side. Since the passage 86 is located at the lower side, even when the hydraulic pressure is extremely low and the flow rate is small, the supplied oil is completely discharged without being retained in the oil passage in the middle due to the flow due to gravity, and the waste is lost. The circulation can be done without.

The oil thus supplied to the coil end 211 drips from the coil end 211, flows down directly or through the case wall to the lowermost portion thereof, and passes through the window 106 below the center support 108 of the motor case 10 m. Eventually it is collected in the oil sump.

In this example, the discharge circuit of the valve body 7 is divided into three branches in the valve body 7, and the first and second oil passages thereof are respectively the shaft support portion on the gear case side and the motor case side. Of the lubricating oil is supplied to each lubrication point.

By the way, it is very important for the electric vehicle to improve the efficiency of the driving device. Therefore, in this example, the drive device is arranged coaxially with the left and right drive wheels to improve the efficiency of the entire drive device including the gear efficiency.However, when the drive device is arranged on one axis in this way, the minimum The drive device is restricted both in its outer diameter and in its axial dimension due to factors such as securing the ground clearance. If it is attempted to secure a sufficient amount of oil for lubrication and cooling in the drive device under these constraint conditions, even the rotating part of the planetary gear will be submerged in the oil, increasing agitation loss and reducing the efficiency of the drive device. Will end up. Therefore, in this example, the gear chamber 109 is demarcated by the center support 108 of the motor case 10m and the ring gear support portion of the gear case 10g, and the gear chamber 109 is positioned at a height higher than the used oil level of the gear chamber 109. The window 107 shown in FIG. 13 for discharging the oil is formed. The center support 108 has a structure for preventing the inflow of oil from the motor 2 side. Therefore, the oil accumulated in the gear chamber 109 is discharged from the window 107 by the rotation of the planetary gear 3 at the initial rotation of the motor 2. And
Since the oil once discharged does not flow into the gear chamber 109 again, the loss of the planetary gear 3 due to oil agitation can be reduced.

Finally, FIG. 14 and FIG.
The 5th example which changed a cooling oil injection member and an axial oilway in an example is shown. In this example, the circumferential oil passage of the first cooling oil injection member 8a is eliminated. On the other hand, the second cooling oil injection member 8b is formed along the contact surface with the motor case and is connected to the axial oil passage 102, as in the case of the fourth embodiment. A circumferential groove 87b slightly wider than that of the fourth embodiment, and an axially extending portion 85b similar to the above.
Injection surface 81b constituted by the lower surface of the injection head, three injection openings 82 also formed on each injection surface, and three injection oil passages connecting the injection openings 82 and the circumferential groove 87. And 86.

FIG. 15 is a circuit diagram showing the connection relationship of the cooling oil passages constituted by the first and second cooling oil injection members 8a and 8b and the axial oil passage 102 of the case. As is clear from the oil passage arrangement in the figure, in this example, the injection ports 8 for each three cooling oil injection members 8 are provided.
The row 2 is an axial oil passage 11 formed separately from the oil passage at a position slightly lower than the axial oil passage 102 above the case.
0 are connected in series with each other. Due to this connection relationship, the left and right injection oil passages 8 with respect to the center injection oil passage 86.
6 are also in series, and the rows of the injection ports 82 addressed to each of these 3 are also connected in series across both cooling oil injection members 8.

In the case of this example, the oil discharged from the oil pump 5 is discharged from the supply pipe 63p to the first oil via the valve body.
The cooling oil injection member 8a is supplied to the member through the central injection oil passage 86, and is injected from each injection port 82 of the oil passage 86 to the first coil end. Then, the surplus oil reaches the circumferential groove 87 of the second cooling oil injection member 8b via the axial oil passage 102, is divided into three in the groove, reaches each of the injection oil passages 86, and the oil passage Is ejected from each of the ejection ports 82 to the second coil end. The oil reaching both ends of the groove 87 is supplied to the injection oil passages 86 on both sides of the first cooling oil injection member 8a via another axial oil passage 110, and is different from the first injection port 82. It is supplied to the second injection port 82 and is injected to the first coil end. As described above, in this example, a small amount of cooling oil is injected by the first cooling oil injection member 8a, and the second cooling oil injection member 8a is injected.
b, and the surplus oil is returned to the first cooling oil injection member 8a. Therefore, the first and second cooling oil injection members 8a and 8b
The amount of oil supplied to a and 8b can be equalized.

The present invention has been described above in detail based on some embodiments. However, the present invention is not limited to the disclosure of the above embodiments, and various modifications can be made within the scope of the claims. It goes without saying that the specific configuration of the details can be changed and implemented.

[Brief description of drawings]

FIG. 1 is an overall conceptual diagram schematically showing an axial cross section of a motor provided with a cooling circuit of the present invention.

FIG. 2 is a conceptual view of the motor of the above embodiment as viewed from the side.

FIG. 3 is a conceptual view of the cooling oil injection unit of the above embodiment as viewed from above.

FIG. 4 is an overall conceptual view similar to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a conceptual view of the motor of the above embodiment as viewed from the side.

FIG. 6 is a conceptual view of a motor according to a third embodiment of the present invention viewed from a side surface direction.

FIG. 7 is an axial sectional view of a fourth embodiment of the present invention.

FIG. 8 is a view taken in the direction of arrows IIX-IIX in FIG. 7.

9 is a view on arrow IX-IX in FIG. 7. FIG.

FIG. 10 is a perspective view of a cooling oil injection member of the fourth embodiment.

FIG. 11 is a circuit diagram of a cooling oil injection unit according to the fourth embodiment.

FIG. 12 is a view on arrow XII-XII in FIG. 7.

FIG. 13 is a view taken along arrow XIII-XIII when the planetary gear and the differential gear of FIG. 7 are removed.

FIG. 14 is a perspective view of a cooling oil injection member according to a fifth embodiment of the present invention.

FIG. 15 is a circuit diagram of a cooling oil injection unit of the fifth embodiment.

[Explanation of symbols]

2 motors 5 oil pump 6 Cooling circuit 8 Cooling oil injection part 10 cases 21 Stator 22 Rotor 63 Supply oil passage 81 Ejection surface 82 jet 83 Edge of injection surface 86 injection oil passage 87 groove 102 Axial oil passage 211 coil end 212 core 213 coil

Continuation of front page (56) Reference JP-A-5-310048 (JP, A) JP-A-3-150050 (JP, A) JP-A-62-293952 (JP, A) JP-A-48-77303 (JP , A) Actually open 61-84663 (JP, U) Actually open 51-97708 (JP, U) Actually open 53-43407 (JP, U) JP 42-7003 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 9/00-9/28

Claims (3)

(57) [Claims] 1. A cylindrical core fixed to the inside of a peripheral wall of a case and having a plurality of slots formed on the inner periphery thereof, a coil wound around the plurality of slots of the core, and both ends of the core. From a stator having first and second coil ends formed in the circumferential direction, and a rotor arranged radially inside the stator and rotatably supported by the case. And a cooling circuit having an oil pump, and a supply oil passage for supplying oil discharged from the oil pump to the upper portion of the motor, the cooling circuit including the first and second cooling circuits. First and second cooling oil injection parts are respectively provided on upper portions of the coil ends of the second coil end, and each of the first and second cooling oil injection parts is formed on the injection surface and the injection surface. And an injection port for injecting oil supplied from a passage, wherein the supply oil passage is the oil The guides the discharge oil supplied from the pump to the first injection port of the first cooling oil injection unit 1
And an oil passage connected to the first oil passage to guide the supplied oil to an injection port of the second cooling oil injection unit, and an oil passage connected to the second oil passage, A cooling circuit for a motor having a third oil passage for guiding the supplied oil to the second injection port of the first cooling oil injection unit. 2. A cylindrical core fixed to the inside of the peripheral wall of the case and having a plurality of slots formed on the inner periphery thereof, a coil wound around the plurality of slots of the core, and both ends of the core. From a stator having first and second coil ends formed in the circumferential direction, and a rotor arranged radially inside the stator and rotatably supported by the case. And a cooling circuit having an oil pump and a supply oil passage for supplying oil discharged from the oil pump to the upper part of the motor, the cooling circuit being provided on the upper part of the core. Axial oil passages formed in the wall of the case, and first and second cooling oils that are in axial contact with the case above the first and second coil ends. An injection member, wherein each of the first and second cooling oil injection members is the case.
A groove formed along a contact surface with the nozzle and connected to the axial oil passage, an injection surface, a plurality of injection ports formed on the injection surface, and a plurality of the injection ports and the groove. A plurality of injection oil passages connected to each other, wherein the supply oil passage is connected to one of the injection oil passages of the first and second cooling oil injection members. Cooling circuit. 3. A cylindrical core fixed to the inside of the peripheral wall of the case and having a plurality of slots formed in the inner periphery thereof, a coil wound around the plurality of slots of the core, and both ends of the core. From a stator having first and second coil ends formed in the circumferential direction, and a rotor arranged radially inside the stator and rotatably supported by the case. And a cooling circuit having an oil pump and a supply oil passage for supplying oil discharged from the oil pump to the upper part of the motor, the cooling circuit being provided on the upper part of the core. A plurality of axial oil passages formed in the wall of the case, and first and second axially abutting portions of the case above the first and second coil ends. A cooling oil injection member, wherein the first cooling oil injection member is formed on the injection surface and the injection surface. A plurality of injection ports, and a plurality of injection oil passages connected to each of the plurality of injection ports and the plurality of axial oil passages, wherein the second cooling oil injection member is the case Groove formed along the contact surface of the case and connected to the plurality of axial oil passages of the case, an injection surface, a plurality of injection ports formed on the injection surface, the plurality of injection ports and the groove. And a plurality of injection oil passages that connect to each other, wherein the supply oil passage is connected to one of the plurality of injection oil passages of the first cooling oil injection member. Cooling circuit.