JP2014054108A - Cooling structure of dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a dynamo-electric machine capable of enhancing the cooling efficiency of a coil.SOLUTION: In the cooling structure 10 of a dynamo-electric machine 20, refrigerant is dropped or jetted to coil ends 50a, 50b through first hole 116a, second hole 116b, third hole 116c and fourth hole 116d. When viewed in the direction of the rotating shaft, the axial direction of the third hole 116c is farther vertically downward than the axial direction of the first hole 116a, and the axial direction of the fourth hole 116d is closer to vertically downward than the axial direction of the second hole 116b.

Description

  The present invention relates to a cooling structure that cools a stator side coil of a rotating electrical machine (for example, a motor or a generator).

  Patent document 1 makes it a subject to cool effectively the part with the large necessity for cooling among the coils which consist of several winding parts provided in the stator core with cooling oil (summary). In order to solve the problem, the motor cooling structure 10 of Patent Document 1 includes a plurality of winding portions 26 wound around the inner periphery of the stator core 18 and the coil 20 to which an AC voltage is applied from the outside of the motor. Cooling oil C is applied to the coil end portion 21 protruding from the axial end surface of the stator core 18 to cool it, and the cooling oil C is drawn from the cooling oil reservoir portion 42 and fed toward the coil end portion 21. An oil feed pipe 40 is included. The cooling oil feed pipe 40 has a discharge port 50 that discharges the cooling oil C toward the coil end portion 21. The discharge port 50 has a position between the first winding portions where the difference in the shared voltage shared by each winding portion among the plurality of winding portions adjacent to each other in the circumferential direction is the largest and between the second winding portions where the next largest winding portion is obtained. The cooling oil C is formed in a direction in which the cooling oil C is discharged (summary).

  With respect to the discharge port 50 that discharges the cooling oil C, the cooling oil discharge pipe 48 of Patent Document 1 includes a first discharge port 50a that discharges or jets the cooling oil C toward the eighth gap 27h in the coil end portion 21, and a coil. A second discharge port 50b for discharging or discharging the cooling oil C toward the first gap 27a is formed in the end portion 21 (FIG. 3, [0044]).

JP 2012-005204 A

  As described above, in the motor cooling structure 10 of Patent Document 1, the cooling oil C is discharged or ejected through the first discharge port 50a and the second discharge port 50b to cool the coil end portion 21, but the cooling efficiency is improved. There is still room for improvement from the viewpoint.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a cooling structure for a rotating electrical machine capable of increasing the cooling efficiency of a coil.

  In the cooling structure for a rotating electrical machine according to the present invention, a conductive wire is wound around a ring-shaped stator core standing upright in the vertical direction so that the rotation axis is horizontal, and a plurality of teeth protruding radially inward from the stator core. A rotating electrical machine cooling structure comprising: a plurality of coils formed on the upper end of a coil end that is a portion protruding from the stator core in the direction of the rotation axis; The refrigerant flow path includes a first refrigerant flow path and a second refrigerant flow path arranged along the rotation axis direction, and when viewed in the rotation axis direction, the first refrigerant flow path is The distance to the straight line in the vertical direction including the rotation axis is shorter than the second refrigerant flow path, and when viewed in the rotation axis direction, the first refrigerant flow path is the first direction toward the rotation axis. On the opposite side of the hole and the rotation axis The second refrigerant flow path includes a third hole facing toward the rotating shaft and a fourth hole facing away from the rotating shaft, the first hole, The coolant is injected or dripped onto the coil end through the second hole, the third hole, and the fourth hole, and when viewed in the rotation axis direction, the axial direction of the third hole is the first hole. The axial direction of the fourth hole is closer to the vertical downward direction than the axial direction of the second hole.

According to the present invention, the cooling efficiency of the coil can be increased.
That is, when viewed in the direction of the rotation axis, the first hole is formed in the first refrigerant flow path having a relatively short distance to the straight line in the vertical direction passing through the rotation axis and faces the rotation axis. For this reason, it becomes possible to supply a refrigerant | coolant from a 1st hole with respect to an upper coil end, and to cool the said upper coil end. Therefore, it is difficult to generate a portion where the refrigerant is not supplied at the upper coil end, and the cooling efficiency can be improved.

  Further, for example, when the distance (radial direction) to the nearest coil end is substantially the same in the first hole and the third hole, and when the axial direction of the first hole and the third hole is the same when viewed in the rotation axis direction, Since the third hole has a longer distance to the rotation axis in the horizontal direction than the first hole, the axial direction of the third hole is closer to the normal direction of the stator core, and the refrigerant from the third hole is directed to a specific part. There is a possibility of being biased. According to the present invention, when viewed in the rotation axis direction, the axial direction of the third hole is farther from the vertically downward direction than the axial direction of the first hole, so that the refrigerant from the third hole is less likely to be biased to a specific part. The cooling efficiency of the coil can be improved.

  In addition, when viewed in the direction of the rotation axis, the axial direction of the third hole is closer to the tangential direction (that is, the horizontal direction) on the outer peripheral surface of the upper coil end than the axial direction of the first hole. The contact area between the outer peripheral surface of the end and the refrigerant can be increased, and the cooling efficiency of the coil can be improved.

  Furthermore, the refrigerant from the first hole partly travels in the circumferential direction through the coil, while another part may fall through the coil in the vertical direction. When a part of the refrigerant from the first hole moves in the circumferential direction through the coil, the coil end part located below the part to which the refrigerant is directly supplied from the first hole also has the first. A part of the refrigerant from the hole moves, and the part can be cooled. On the other hand, the refrigerant that has fallen through the coil in the vertical direction moves downward without cooling other than the directly supplied portion. In the present invention, the first refrigerant flow path includes a first hole directed to the rotation axis side and a second hole directed to the opposite side of the rotation axis. Thereby, it becomes possible to make a refrigerant | coolant fully reach the coil which exists in the vicinity of the coil to which the refrigerant | coolant from a 1st hole is directly supplied, and the said coil toward the circumferential direction. Accordingly, it is possible to reduce the portion where the refrigerant is not supplied and improve the cooling efficiency.

  In addition, for example, the distance (radial direction) to the nearest coil end is substantially the same in the second hole and the fourth hole, and when viewed in the rotation axis direction, the axial directions of the second hole and the fourth hole are In the same case, the fourth hole has a longer distance to the rotation axis in the horizontal direction than the second hole. Therefore, the fourth hole is more than the tangent at the portion where the coolant from the second hole directly hits the outer surface of the stator core. Since the tangent at the location where the refrigerant from the direct contact is closer to the vertical direction, the angle formed by the axial direction of the fourth hole and the tangent at the location where the coolant from the fourth hole directly contacts is increased. The refrigerant may jump out of the coil end and fall without cooling the coil. According to the present invention, since the axial direction of the fourth hole is closer to the vertically downward direction than the axial direction of the second hole when viewed in the rotation axis direction, the refrigerant from the fourth hole may jump out of the coil end. It becomes possible to reduce and improve the cooling efficiency of a coil.

  Further, when viewed in the rotational axis direction, the axial direction of the fourth hole is closer to the tangential direction (ie, the vertical direction) on the outer peripheral surface of the side coil end than the axial direction of the second hole. The contact area between the outer peripheral surface of the coil end and the refrigerant can be increased, and the cooling efficiency of the coil can be improved.

  The first hole, the second hole, the third hole, and the fourth hole are opposed to a portion (outer surface) where the coil is exposed, not the gap between the plurality of coils, in the coil end. May be. Thereby, the area where the coolant is supplied on the outer surface of the coil can be increased. Therefore, the cooling efficiency of the coil can be improved.

  The second refrigerant channel may be arranged at a position lower than the first refrigerant channel. Thereby, since the refrigerant | coolant from a 3rd hole and a 4th hole will be supplied in the state which approached the coil end of supply object, it becomes possible to make the shift | offset | difference of a supply position small.

  The first refrigerant flow path and the second refrigerant flow path are constituted by a plurality of pipes having a common specification, and the angles formed by the axes of the first hole and the second hole are the third hole and the fourth hole. May be equal to the angle formed by the axis. As a result, the first refrigerant flow path and the second refrigerant flow path can be configured by a plurality of pipes having a common specification. For example, the first refrigerant flow path and the second refrigerant flow path are formed by a plurality of pipes having different specifications. The number of parts can be reduced as compared with the case where the pipes are configured, and a mistake in assembling the pipes can be prevented.

  The cooling structure includes a plurality of rotating electric machines having a common rotating shaft, and the coils of the stators of the plurality of rotating electric machines are arranged so as to be in phase with each other, and the outer diameter of the coil end Are substantially equal to each other, and the refrigerant flow paths are arranged linearly across the top of the plurality of rotating electric machines and along the rotation axis direction, and the first refrigerant flow paths include the plurality of rotating electric machines. The first hole and the second hole are formed for each, and the third hole and the fourth hole are formed for each of the plurality of rotating electrical machines in the second refrigerant flow path, and the first hole, The second hole, the third hole, and the fourth hole may have the same angle when viewed from the direction of the rotation axis for any rotating electrical machine. Thereby, it becomes possible to make a 1st refrigerant flow path and a 2nd refrigerant flow path common about several rotary electric machines. In addition, the formation or processing of the first to fourth holes in the first refrigerant channel and the second refrigerant channel can be performed collectively by a plurality of rotating electric machines. Therefore, the production efficiency of the cooling structure can be improved.

  In particular, when the first refrigerant flow path and the second refrigerant flow path are configured from a common specification pipe, the first hole and the third hole are the common specification, and the second hole and the fourth hole are the common specification. Processing becomes easy.

  In the cooling structure for a rotating electrical machine according to the present invention, a conductive wire is wound around a ring-shaped stator core standing upright in the vertical direction so that the rotation axis is horizontal, and a plurality of teeth protruding radially inward from the stator core. And at least one refrigerant flow path that circulates a refrigerant that is supplied to a coil end that is a portion of the plurality of coils protruding from the stator core in the rotation axis direction and cools the plurality of coils. A cooling structure for a rotating electrical machine comprising: an upper hole group including an upper inner hole and an upper outer hole, a lower inner hole, and a lower part in the at least one refrigerant channel when viewed in the direction of the rotation axis. A plurality of lower hole groups including outer holes are formed symmetrically with respect to a vertical straight line including the rotation axis, and the upper hole group is formed as the lower hole when viewed in the rotation axis direction. The upper inner hole discharges the refrigerant toward the rotating shaft with respect to the upper coil end, and the upper outer hole is positioned above the upper straight hole. The refrigerant is discharged toward the opposite side of the rotating shaft with respect to the coil end, and the lower inner hole discharges the refrigerant toward the rotating shaft with respect to the side coil end. The outer hole discharges the refrigerant toward the opposite side of the rotation axis with respect to the side coil end, and when viewed in the rotation axis direction, the axial direction of the lower inner hole is the upper inner hole. The axial direction of the lower outer hole is closer to the vertical downward direction than the axial direction of the upper outer hole when viewed in the rotational axis direction and farther from the vertical downward direction.

  A cooling structure for a rotating electrical machine according to the present invention includes a ring-shaped stator that stands in the vertical direction so that the rotation axis is horizontal, and a refrigerant that is disposed above the stator along the rotation axis direction and cools the stator. A rotating electrical machine cooling structure including at least one refrigerant flow path that circulates in the direction of the rotation axis, the at least one refrigerant flow path has a vertical straight line passing through the rotation axis. A plurality of upper cooling holes for injecting or dripping the refrigerant on the upper side of the stator, and when viewed in the direction of the rotation axis, are arranged symmetrically with respect to the vertical straight line. And a plurality of side cooling holes for injecting or dropping the refrigerant on the side of the stator.

  According to the present invention, the upper side of the stator is cooled by the refrigerant injected or dropped from the plurality of upper cooling holes, and the side of the stator is cooled by the refrigerant injected or dropped from the plurality of side cooling holes. . Therefore, the portion where the refrigerant is not supplied can be reduced, and the stator can be uniformly cooled.

  A cooling structure for a rotating electrical machine according to the present invention includes a ring-shaped stator that stands in the vertical direction so that the rotation axis is horizontal, and a refrigerant that is disposed above the stator along the rotation axis direction and cools the stator. A cooling structure for a rotating electrical machine comprising a plurality of refrigerant flow paths that circulate the refrigerant, wherein the plurality of refrigerant flow paths include a plurality of first refrigerant flow paths and a plurality of first flow paths arranged along the rotation axis direction. When viewed in the direction of the rotation axis, including the two refrigerant channels, the plurality of first refrigerant channels are arranged symmetrically with respect to a straight line in the vertical direction passing through the rotation axis, and the upper side of the stator The refrigerant is injected or dropped, and the plurality of second refrigerant flow paths are arranged symmetrically with respect to the straight line in the vertical direction, and the refrigerant is injected or dropped to the side of the stator.

  According to the present invention, the upper side of the stator is cooled by the refrigerant injected or dropped from the plurality of first refrigerant channels, and the side of the stator is cooled by the refrigerant injected or dropped from the plurality of second refrigerant channels. To do. Therefore, the portion where the refrigerant is not supplied can be reduced, and the stator can be uniformly cooled. In addition, since the first refrigerant flow path and the second refrigerant flow path are arranged along the rotation axis direction, the first refrigerant flow path and the second refrigerant flow path can be used even when the outer peripheral space of the stator is limited. It becomes possible to easily arrange the refrigerant flow path.

  The rotating electrical machine cooling structure according to the present invention is a cooling structure for a plurality of rotating electrical machines having a common rotating shaft, and each of the plurality of rotating electrical machines has a vertical direction such that the rotating shaft is horizontal. The stators of the plurality of rotating electrical machines are configured to have the same outer diameter, and the cooling structure is disposed along the rotational axis direction above each stator, and And at least one refrigerant flow path for injecting or dripping the refrigerant.

  According to the present invention, in a configuration in which a plurality of annular stators standing in the vertical direction are arranged coaxially so that the rotation axis is horizontal, each stator is disposed from at least one refrigerant flow path arranged along the rotation axis direction. The refrigerant is jetted or dripped onto. Therefore, a plurality of stators can be cooled using a common refrigerant flow path, and space can be saved. In addition, since at least one refrigerant flow path is arranged along the rotation axis direction, it is easy to arrange at least one refrigerant flow path even when the outer peripheral space of each stator is limited. Is possible.

  According to the present invention, the cooling efficiency of the coil can be increased.

It is a figure which shows the flow of a refrigerant | coolant while showing the external appearance of a part of electric vehicle as a cooling structure which concerns on one Embodiment of this invention. It is a cross-sectional perspective view of a part of the electric vehicle. It is a perspective view which shows a part of motor stator simply. It is a block diagram which shows the outline | summary of a cooling system. It is a figure which shows a mode that a refrigerant | coolant is injected or dripped at a motor. It is the elements on larger scale of FIG. It is sectional drawing of a part of driving force production | generation part and the said cooling system.

A. Embodiment 1 FIG. Explanation of overall configuration [1-1. overall structure]
FIG. 1 is a view showing the appearance of a part of an electric vehicle 10 (hereinafter also referred to as “vehicle 10”) as a cooling structure according to an embodiment of the present invention and the flow of refrigerant. In FIG. 1, an arrow C indicates the flow of the refrigerant. FIG. 2 is a cross-sectional perspective view of a part of the vehicle 10.

  The vehicle 10 according to the present embodiment is a so-called hybrid vehicle, and cools the driving force generation unit 12 that generates the driving force F [N] (or torque [N · m]) of the vehicle 10 and the driving force generation unit 12. And a cooling system 14. As will be described later, the vehicle 10 is a vehicle other than a hybrid vehicle as long as it has a rotating electrical machine (such as a motor 20 and a generator 22) to be cooled and a cooling system (such as a cooling system 14) for cooling the vehicle. It may be.

[1-2. Driving force generator 12]
(1-2-1. Overall Configuration of Driving Force Generating Unit 12)
The driving force generation unit 12 includes an engine (not shown), a motor 20, and a generator 22. The engine is a main driving source for generating the driving force F of the vehicle 10, and here, the driving force is indicated by Fe.

(1-2-2. Motor 20)
The motor 20 is a secondary driving source for generating the driving force F of the vehicle 10. The motor 20 is a three-phase AC brushless type, and generates a driving force F of the vehicle 10 based on electric power supplied from a battery (not shown) via an inverter (not shown). Further, the motor 20 charges the battery by outputting electric power (regenerative power Preg) [W] generated by performing regeneration to the battery. The regenerative power Preg may be output to a 12 volt system or an auxiliary machine (not shown). The motor 20 includes a motor rotor 30 and a motor stator 32.

  FIG. 3 is a perspective view schematically showing a part of the motor stator 32. As shown in FIG. 3, the motor stator 32 includes a stator core 40, a slot 42, and a conductive wire 44 (magnet wire).

  The stator core 40 is a ring-shaped member having a thickness in the direction of the rotation axis of the motor 20 (X1 and X2 directions in FIG. 1 and the like). The stator core 40 stands in the vertical direction (Z1 and Z2 directions in FIG. 1 and the like) so that the rotation axis Ax (FIG. 3) is horizontal. The stator core 40 has slots 42 between teeth 46 formed at equal intervals in the circumferential direction of the motor 20 (C1 and C2 directions in FIG. 3 and the like) and extending in the radial direction (R1 and R2 directions in FIG. 3 and the like). The conductor 44 is wound around the plurality of slots 42 while being arranged. A coil 48 (winding portion) is formed by the wound conductive wire 44. The motor stator 32 in this embodiment is so-called distributed winding. Alternatively, the motor stator 32 may be so-called concentrated winding.

  As shown in FIGS. 2 and 3, the end portions of the respective coils 48 in the rotation axis directions X <b> 1 and X <b> 2 (hereinafter referred to as “coil ends 50 a and 50 b”) protrude or protrude from the stator core 40. It should be noted that the coil 48 in FIG. 2 is shown in a simplified manner with the conducting wires 44 being grouped.

(1-2-3. Generator 22)
The generator 22 generates electric power based on the driving force Fe from the engine, and outputs the generated electric power Pg to the motor 20 or an auxiliary machine (not shown). The generator 22 has a generator rotor 60 and a generator stator 62.

  The generator stator 62 has the same configuration as that of the motor stator 32, although the thicknesses (X1 and X2 directions) are different (see FIG. 2). That is, the generator stator 62 has a stator core 70, a slot (not shown), and a conducting wire 74 (magnet wire).

  The stator core 70 is a ring-shaped member having a thickness in the direction of the rotation axis of the generator 22 (X1 and X2 directions in FIG. 1 and the like). The stator core 70 stands up in the vertical direction (Z1 and Z2 directions in FIG. 1 and the like) so that the rotation axis Ax (FIG. 3) is horizontal. The stator core 70 is formed between the teeth 76 formed at regular intervals in the circumferential direction of the generator 22 (C1, C2 direction in FIG. 3, etc.) and extending in the radial direction (R1, R2 direction in FIG. 3, etc.). (Not shown) is disposed, and a conductive wire 74 is wound around the plurality of slots. A coil 78 (winding portion) is formed by the wound conductive wire 74. The generator stator 62 in the present embodiment is so-called distributed winding. Alternatively, the generator stator 62 may be so-called concentrated winding.

  As shown in FIG. 2, each coil 78 has end portions (hereinafter referred to as “coil ends 80 a and 80 b”) in the rotation axis directions X <b> 1 and X <b> 2 projecting or protruding from the stator core 70. It should be noted that the coil 78 in FIG. 2 is shown in a simplified manner with the conducting wires 74 together.

  As shown in FIG. 2, the motor 20 and the generator 22 of this embodiment are arrange | positioned coaxially. In the radial directions R1 and R2, the outer diameters of the stator cores 40 and 70 are the same, and the outer diameters of the coil ends 50a, 50b, 80a, and 80b are the same. In addition, the motor 20 and the generator 22 are accommodated in a common housing 90. The motor 20 and the generator 22 are arranged such that their rotational axes Ax are positioned along the vertical and horizontal directions with respect to the vertical directions Z1 and Z2.

  The motor stator 32 and the generator stator 62 of the present embodiment are in phase. That is, the positions where the coils 48 and 78 exist in the circumferential directions C1 and C2 are arranged to coincide with each other. In addition, coils 48 and 78 are arranged on the uppermost portions of the motor stator 32 and the generator stator 62. In other words, the gap between the coils 48 or the gap between the coils 78 is not located at the top.

  In addition, as a fundamental structure of the said engine, the motor 20, and the generator 22, what is described in the international publication 2009/128288 pamphlet can be used, for example.

[1-3. Cooling system 14]
(1-3-1. Overall Configuration of Cooling System 14)
FIG. 4 is a block diagram showing an outline of the cooling system 14. As described above, the cooling system 14 cools the driving force generation unit 12 (that is, the engine, the motor 20, and the generator 22). In the following, the configuration for cooling the motor stator 32 and the generator stator 62 in particular will be described. Will be described.

  As shown in FIG. 4, in the cooling system 14, the stator core 40 and the coil 48 of the motor stator 32 and the stator core 70 and the coil 78 of the generator stator 62 are cooled by the refrigerant. Although not shown in FIG. 4, for example, transmission parts (for example, gears, bearings) (not shown) that are arranged adjacent to the motor 20 and can be connected to the motor 20 or the generator 22 are cooled by the cooling system 14. Good.

  As shown in FIGS. 1, 2, and 4, the cooling system 14 includes a pump 100, the housing 90, a cooler 102 (radiator), and a refrigerant flow path 104. In addition, the symbol of resistance in FIG. 4 has shown thermal resistance.

(1-3-2. Pump 100)
The pump 100 circulates a refrigerant (for example, oil or water), and is a mechanical pump that outputs in accordance with the rotation of the engine. The pump 100 may be another pump (for example, an electric pump) as long as it can circulate the refrigerant.

(1-3-3. Housing 90)
As described above, the housing 90 houses the motor 20 and the generator 22, has a function of protecting the motor 20 and the generator 22, and stores a refrigerant case (for example, an oil) that accumulates the refrigerant that has cooled the motor 20 and the generator 22. Function as a pan).

(1-3-4. Cooler 102)
The cooler 102 radiates the refrigerant. As shown in FIG. 1, the cooler 102 of the present embodiment is provided in a part of the front bumper 106 of the vehicle 10. Thus, the refrigerant is cooled by the wind hitting the cooler 102 when the vehicle 10 is traveling. As long as the refrigerant can be cooled, the cooler 102 may be disposed in other parts.

(1-3-5. Refrigerant channel 104)
(1-3-5-1. Outline of Refrigerant Channel 104)
The refrigerant flow path 104 circulates the refrigerant through a path as shown by an arrow C in FIGS. 1, 2, and 4. The refrigerant flow path 104 includes a plurality of pipes (including pipes 112a to 112d described later), a space in the housing 90, and the like. Below, the flow path for injecting or dripping the refrigerant | coolant output from the pump 100 to the motor stator 32 and the generator stator 62 especially is demonstrated.

  FIG. 5 is a diagram illustrating a state in which the refrigerant is injected or dropped onto the motor 20. FIG. 6 is a partially enlarged view of FIG. Note that in FIGS. 5 and 6, the motor rotor 30 and the motor stator 32 are shown in a simplified manner. As shown in FIGS. 1, 2, and 5, the coolant flow path 104 is generically referred to as four pipes 112 a to 112 d (hereinafter referred to as “pipes 112”) branched from the first side cover 110 (FIG. 1) of the housing 90. .)including.

(1-3-5-2. Pipes 112a to 112d)
Each of the pipes 112 a to 112 d is arranged in parallel with the rotation axis Ax of the motor 20 and the generator 22. As shown in FIGS. 2 and 5, one end (upstream end portion) of each of the pipes 112 a to 112 d is inserted into the first side cover 110 and is connected to a flow path formed in the first side cover 110. The other ends (downstream end portions) of the pipes 112 a to 112 d are inserted into the second side cover 114.

  Unlike the first side cover 110, the second side cover 114 does not have the refrigerant flow path 104, so the flow paths formed by the pipes 112a to 112d are dead ends at the downstream end, The pipes 112a to 112d are discharged through holes 116a to 116d, which will be described later.

  As shown in FIG. 5, of the four pipes 112a to 112d, two pipes 112a and 112b (hereinafter also referred to as “upper pipes 112a and 112b”) are arranged on the upper side in the vertical directions Z1 and Z2, and the remaining pipes The pipes 112c and 112d (hereinafter also referred to as “lower pipes 112c and 112d”) are disposed on the lower side in the vertical directions Z1 and Z2.

  As shown in FIGS. 5 and 6, the two upper pipes 112a and 112b are arranged substantially symmetrically (line symmetric) across the straight line L1 in the vertical directions Z1 and Z2 including the rotation axis Ax of the motor 20 and the generator 22. Has been. Similarly, the two lower pipes 112c and 112d are disposed substantially symmetrically across the straight line L1 in the vertical directions Z1 and Z2.

  The pipes 112a to 112d inject or drip refrigerant onto the coil ends 50a, 50b, 80a, and 80b of the motor stator 32 and the generator stator 62 (see FIGS. 2 and 5). That is, each of the pipes 112a to 112d is formed with two holes corresponding to the coil ends 50a, 50b, 80a, and 80b (see FIGS. 5 and 6). Specifically, two holes 116a and 116b are formed in the upper pipes 112a and 112b corresponding to the coil ends 50a, 50b, 80a, and 80b, respectively. Two holes 116c and 116d are formed in the lower pipes 112c and 112d corresponding to the coil ends 50a, 50b, 80a and 80b, respectively.

  The refrigerant in the pipes 112a to 112d is discharged out of the pipes 112a to 112d through these holes 116a to 116d. Thereby, a refrigerant | coolant contacts coil ends 50a, 50b, 80a, 80b, and each coil 48, 78 is cooled by heat-exchange. More specifically, the upper pipes 112a and 112b are disposed on the upper side of the motor stator 32 (mainly, the part where the motor rotor 30 exists below) and on the upper side of the generator stator 62 (mainly, the part where the generator rotor 60 exists below). Supply refrigerant. The lower pipes 112c and 112d supply refrigerant to the side of the motor stator 32 (mainly, the portion where the motor rotor 30 does not exist below) and the side of the generator stator 62 (mainly, the portion where the generator rotor 60 does not exist below). To do.

  As described above, the coil ends 50a, 50b, 80a, and 80b are portions that protrude from or protrude from the stator cores 40 and 70 toward the rotation axis directions X1 and X2 (when viewed in the vertical directions Z1 and Z2). Yes (see FIG. 2 and FIG. 3).

(1-3-5-3. Holes 116a to 116d)
(1-3-5-3-1. Overview of holes 116a to 116d)
As described above, each of the pipes 112a to 112d has two holes 116a to 116d corresponding to the coil ends 50a, 50b, 80a, and 80b. Therefore, the number of holes 116a and 116b formed in each upper pipe 112a and 112b is eight, and the number of holes 116c and 116d formed in each lower pipe 112c and 112d is eight. The total number of holes 116a to 116d is 32.

  In the present embodiment, each of the holes 116a to 116d has a columnar shape, but is not limited thereto, and has a truncated cone shape (a shape that decreases in diameter as it goes to the tip) or an inverted truncated cone shape (a diameter that increases toward the tip). Shape) or the like.

  In the present embodiment, the dimensions of the holes 116a to 116d and the supply amounts from the holes 116a to 116d are the same, but may be different depending on the specifications of the motor stator 32 and the generator stator 62.

  When sufficient pressure is applied to the refrigerant, the refrigerant from the holes 116a to 116d does not spread radially but is discharged linearly. However, the holes 116a to 116d may be shaped like nozzles so as to spread radially. 2, 5, and 6 indicate the refrigerant injection direction and the direction of the holes 116 a to 116 d (in other words, the axial direction of the holes 116 a to 116 d). Moreover, the curve E of FIG.5 and FIG.6 has shown the outermost diameter of the coil end 50a.

(1-3-5-3-2. Arrangement, orientation, and axis of holes 116a to 116d)
As can be seen from the arrow D1 in FIG. 2, in the rotation axis directions X1 and X2, the holes 116a to 116d are arranged in accordance with the approximate center of the corresponding coil ends 50a, 50b, 80a, and 80b. At this time, the axes of the holes 116a to 116d are located on a virtual plane perpendicular to the rotation axis Ax.

  The hole 116a is inclined so that the refrigerant hits the coil ends 50a, 50b, 80a, and 80b before the straight line L1 (FIG. 6) in the vertical direction. Thus, after the refrigerant hits the coil ends 50 a, 50 b, 80 a, 80 b, the refrigerant sufficiently reaches the uppermost periphery of the motor stator 32 or the generator stator 62. Therefore, the upper side of the motor stator 32 or the generator stator 62 can be sufficiently cooled. In addition, it is possible to avoid collision of the refrigerant injected from the two holes 116a arranged across the straight line L1. The direction of the hole 116a (when viewed in the rotation axis directions X1 and X2, the angle of the axis of the hole 116a with respect to the vertical straight line passing through the center of the hole 116a = the inclination of the arrow D1) is any of 15 ° to 75 °, for example. It is possible to take such a value, and it is more suitable to set it as 25 degrees-55 degrees.

  The hole 116b is arranged so that the refrigerant reaches a portion of the upper side (mainly, the portion where the motor rotor 30 exists below) of the motor stator 32 or the generator stator 62 that is difficult for the refrigerant from the hole 116a to reach. Accordingly, the upper side of the motor stator 32 or the generator stator 62 can be effectively cooled by the holes 116a and 116b. The direction of the hole 116b (when viewed in the rotation axis directions X1 and X2, the angle of the axis of the hole 116b with respect to the vertical straight line passing through the center of the hole 116b = the inclination of the arrow D2) is, for example, any of 15 ° to 75 ° It is possible to take such a value, and it is more suitable to set it as 25 degrees-55 degrees.

  The holes 116c and 116d are formed so that the refrigerant reaches the side of the motor stator 32 or the generator stator 62 (mainly, the portion where the motor rotor 30 does not exist below). Thereby, it becomes possible to make a refrigerant | coolant reach the site | part (especially outer surface of a side part) where the refrigerant | coolant from the holes 116a and 116b cannot reach easily. The direction of the hole 116c (when viewed in the rotation axis directions X1 and X2, the angle of the axis of the hole 116c with respect to the vertical straight line passing through the center of the hole 116c = the inclination of the arrow D3) is any of 5 ° to 85 °, for example It is possible to take such a value, and it is more suitable to set it as 60 degrees-85 degrees. The direction of the hole 116d (when viewed in the rotation axis directions X1 and X2, the angle of the axis of the hole 116d with respect to a straight line passing through the center of the hole 116d = the inclination of the arrow D4) is, for example, any of 5 ° to 85 ° It is possible to make these values, and it is more preferable that the angle is 5 ° to 30 °.

  In the present embodiment, by using the two upper pipes 112a and 112b, it becomes possible to uniformly supply the refrigerant to the upper side of the motor stator 32 or the generator stator 62.

  As shown in FIGS. 5, 6, etc., the holes 116 a to 116 d of this embodiment have different orientations when viewed in the rotation axis directions X <b> 1 and X <b> 2 (axis direction = inclination of arrows D <b> 1 to D <b> 4). . That is, when comparing the hole 116a and the hole 116c, the direction (axis) of the hole 116a (= inclination of the arrow D1) is closer to the vertically downward direction (Z2 direction), and the direction (axis) of the hole 116c (= arrow D3). Is more similar to the horizontal directions Y1 and Y2.

  When comparing the hole 116b and the hole 116d, the direction (axis) of the hole 116d (= inclination of the arrow D4) is closer to the vertically downward direction (Z2 direction), and the direction (axis) of the hole 116b (= inclination of the arrow D2) ) Is closer to the horizontal directions Y1 and Y2.

  Furthermore, in the present embodiment, the pipes 112a to 112d have the same specifications (including the shapes and positions of the holes 116a to 116d). Therefore, when viewed in the rotation axis directions X1 and X2, the angle formed by the axis of the pair of holes 116a and 116b (arrows D1 and D2 in FIGS. 5 and 6) in each upper pipe 112a and 112b, The angle formed by the axes (arrows D3 and D4 in FIGS. 5 and 6) of the pair of holes 116c and 116d in the side pipes 112c and 112d is the same. In the present embodiment, the angle is 90 ° (right angle), but may be other values (for example, any value between 30 ° and 150 °).

(1-3-5-3-3. Positioning of holes 116a to 116d)
FIG. 7 is a cross-sectional view of a part of the driving force generation unit 12 and the cooling system 14. As shown in FIG. 7, the convex part 120 for positioning is formed in the pipe 112a. The housing 90 is formed with a positioning recess 122. Similarly, the convex part 120 is formed also in the pipes 112b-112d, and the recessed part 122 corresponding to these is formed in the housing 90. FIG.

  As described above, the pipes 112a to 112d have the same specifications. For this reason, the positional relationship between the convex portion 120 and the holes 116a to 116d is the same in each of the pipes 112a to 112d. Therefore, in order to make the directions (axis directions) of the holes 116a to 116d different between the upper pipes 112a and 112b and the lower pipes 112c and 112d, the shapes of the recesses 122 formed in the housing 90 are made different. The direction of 116a-116d is positioned. That is, the recesses 122 of the housing 90 are formed so that the orientations of the holes 116a to 116d when the projections 120 come into contact with the recesses 122 become the design values by rotating the pipes 112a to 112d around their axes. To do. Accordingly, even if the pipes 112a to 112d have the same specifications, the directions of the holes 116a to 116d can be made different between the upper pipes 112a and 112b and the lower pipes 112c and 112d.

2. Next, the flow of the refrigerant will be described. As shown in FIGS. 1, 2, and 4, the refrigerant is supplied from the housing 90 to the pipes 112 a to 112 d through the cooler 102 and the first side cover 110 by the output of the pump 100.

  Thereafter, the refrigerant is guided in the pipes 112a to 112d toward the rotation axis direction X1, and outside the pipes 112a to 112d through the holes 116a to 116d (specifically, coil ends 50a, 50b, 80a, 80b). Sprayed or dripped.

  The injected or dropped refrigerant travels down the coils 48 and 78 or the stator cores 40 and 70 (for example, the teeth 46 and 76) and falls downward (see FIG. 5). Alternatively, in particular, the refrigerant injected or dripped onto the uppermost part of the motor stator 32 or the generator stator 62 (the vicinity of the straight line L1 in FIG. 5) once falls on the motor rotor 30 or the generator rotor 60 and then the motor stator 32 or the generator stator. In some cases, the lower part of 62 may be reached.

  The refrigerant that has cooled the motor stator 32 (coil 48 or the like) or the generator stator 62 (coil 78 or the like) by passing through the motor stator 32 or the generator stator 62 is then accumulated at the bottom of the housing 90. Then, it is pulled up by the pump 100 and circulates through the refrigerant flow path 104 again.

3. As described above, according to this embodiment, the cooling efficiency of the coils 48 and 78 can be increased.
That is, the hole 116a (first hole, upper inner hole) is an upper pipe 112a whose distance to the straight line L1 in the vertical directions Z1 and Z2 passing through the rotation axis Ax is relatively short when viewed in the rotation axis directions X1 and X2. , 112b (first refrigerant flow path) and facing the rotation axis Ax (see FIGS. 5 and 6). For this reason, it is possible to supply the coolant from the hole 116a to the upper coil ends 50a, 50b, 80a, 80b, and to cool the upper coil ends 50a, 50b, 80a, 80b. Therefore, it is difficult to generate a portion where the refrigerant is not supplied in the upper coil ends 50a, 50b, 80a, and 80b, and the cooling efficiency can be improved.

  Further, for example, distances (radial directions R1, R2) to the nearest coil ends 50a, 50b, 80a, 80b are holes 116a (first hole, upper inner hole) and holes 116c (third hole, lower inner hole). If the axial directions of the holes 116a and 116c (inclinations of arrows D1 and D3) are the same when viewed in the rotation axis directions X1 and X2, the rotation axis Ax in the horizontal direction is greater in the hole 116c than in the hole 116a. (The distance to the straight line L1) is long, the axial direction of the hole 116c (inclination of the arrow D3) is close to the normal direction of the stator cores 40 and 70, and the refrigerant from the hole 116c is biased to a specific part. There is a possibility. According to this embodiment, when viewed in the rotation axis directions X1 and X2, the axial direction of the hole 116c (inclination of the arrow D3) is vertically downward (Z2 direction) than the axial direction of the hole 116a (inclination of the arrow D1). Therefore, it is difficult for the refrigerant from the hole 116c to be biased to a specific part, and the cooling efficiency of the coils 48 and 78 can be improved.

  Further, according to the present embodiment, when viewed in the rotation axis directions X1 and X2, the axial direction of the hole 116c (inclination of the arrow D3) is higher than the axial direction of the hole 116a (inclination of the arrow D1). Since it is close to the tangential direction (that is, the horizontal direction) on the outer peripheral surface of the end 50a, the contact area between the outer peripheral surface of the upper coil end 50a and the refrigerant can be increased, and the cooling efficiency of the coils 48 and 78 is improved. Is possible.

  Furthermore, a part of the refrigerant from the hole 116a travels in the circumferential directions C1 and C2 through the coils 48 and 78, while another part passes through the coils 48 and 78 in the vertical direction Z2 and falls. There is a possibility that. When a part of the refrigerant from the hole 116a travels in the circumferential directions C1 and C2 through the coils 48 and 78, the coil ends 50a and 50b located below the part to which the refrigerant is directly supplied from the hole 116a. , 80a and 80b, a part of the refrigerant from the hole 116a moves and can cool the part. On the other hand, the refrigerant that has fallen through the coils 48 and 78 in the vertical direction Z2 moves downward without cooling other than the directly supplied portion. In the present embodiment, the upper pipes 112a and 112b include a hole 116b (second hole) facing the rotation axis Ax in addition to the hole 116a facing the rotation axis Ax. As a result, the refrigerant sufficiently reaches the coils 48 and 78 that exist near the coils 48 and 78 to which the refrigerant from the hole 116a is directly supplied and in the circumferential directions C1 and C2 and below the coils 48 and 78. It becomes possible. Accordingly, it is possible to reduce the portion where the refrigerant is not supplied and improve the cooling efficiency.

  Furthermore, for example, distances (radial directions R1, R2) to the nearest coil ends 50a, 50b, 80a, 80b are holes 116b (second hole, upper outer hole) and holes 116d (fourth hole, lower outer hole). If the axial directions of the holes 116b and 116d (inclinations of arrows D2 and D4) are the same when viewed in the rotation axis directions X1 and X2, the hole 116d is more horizontally oriented than the hole 116b. Since the distance to the rotation axis Ax (distance to the straight line L1) is long, the portion where the refrigerant from the hole 116d directly hits the outer surface of the stator cores 40, 70 than the tangential line where the refrigerant from the hole 116b directly hits Is closer to the vertical direction, and the angle formed by the axial direction of the hole 116d (inclination of the arrow D4) and the tangent at the point where the refrigerant directly contacts the hole 116d is large. By Kunar, refrigerant coil end 50a of the hole 116d, 50b, 80a, jumped out 80b, there is a possibility of falling without cooling coils 48, 78. According to this embodiment, when viewed in the rotation axis directions X1 and X2, the axial direction of the hole 116d (inclination of arrow D4) is vertically downward (Z2 direction) than the axial direction of the hole 116b (inclination of arrow D2). Therefore, the possibility that the refrigerant from the hole 116d jumps out of the coil ends 50a, 50b, 80a, 80b can be reduced, and the cooling efficiency of the coils 48, 78 can be improved.

  Further, according to the present embodiment, when viewed in the rotation axis directions X1 and X2, the axial direction of the hole 116d (inclination of the arrow D4) is more lateral than the axial direction of the hole 116b (inclination of the arrow D2). Since the outer ends of the coil ends 50a, 50b, 80a, and 80b are close to the tangential direction (that is, the vertical direction), the contact area between the outer peripheral surfaces of the side coil ends 50a, 50b, 80a, and 80b and the refrigerant is increased. Therefore, the cooling efficiency of the coils 48 and 78 can be improved.

  In the present embodiment, the holes 116a to 116d (first to fourth holes) are not the gaps between the plurality of coils 48 and 78 but the coils 48 and 78 at the coil ends 50a, 50b, 80a, and 80b. It faces the part (outer surface). Thereby, the area where the coolant is supplied on the outer surfaces of the coils 48 and 78 can be increased. Therefore, the cooling efficiency of the coils 48 and 78 can be improved.

  In the present embodiment, the lower pipes 112c and 112d (second refrigerant flow path) are arranged at positions lower than the upper pipes 112a and 112b (first refrigerant flow path). Accordingly, the refrigerant from the hole 116c (third hole) and the hole 116d (fourth hole) is supplied in a state of approaching the coil ends 50a, 50b, 80a, and 80b to be supplied. It is possible to reduce the deviation.

  In the present embodiment, the upper pipes 112a and 112b (first refrigerant flow path) and the lower pipes 112c and 112d (second refrigerant flow path) are configured by a plurality of pipes having common specifications, and the holes 116a and 116b (first refrigerant flow paths). The angle formed by the axis of the first hole and the second hole is equal to the angle formed by the axes of the hole 116c and the hole 116d (third and fourth holes). As a result, the upper pipes 112a and 112b and the lower pipes 112c and 112d can be configured by a plurality of pipes having a common specification. For example, the upper pipes 112a and 112b and the lower pipes 112c and 112d can be a plurality of pipes having different specifications. The number of parts can be reduced as compared with the case where the pipe is configured, and a mistake in assembling the pipe can be prevented.

  In the present embodiment, the vehicle 10 (cooling structure) includes a motor 20 (first rotating electrical machine) and a generator 22 (second rotating electrical machine) having a common rotation axis Ax, and the motor stator 32 and the generator stator 62 are: The coils 48 and 78 are disposed so as to be in phase with each other, and the outer diameters of the coil ends 50a, 50b, 80a, and 80b are configured to be equal (FIG. 2), and the refrigerant flow path 104 (the upper pipes 112a and 112b and the lower pipe) The side pipes 112c and 112d) are arranged linearly across the upper portions of the motor 20 and the generator 22 and along the rotation axis directions X1 and X2 (see FIGS. 2 and 5). The upper pipes 112a and 112b have holes 116a (first holes) and holes 116b (second holes) for the motor 20 and the generator 22, respectively. The lower pipes 112c and 112d (second refrigerant flow paths) A hole 116c (third hole) and a hole 116d (fourth hole) are formed for the motor 20 and the generator 22, respectively. The holes 116a to 116d (first to fourth holes) have the same angle when viewed from the rotation axis directions X1 and X2 in both the motor 20 and the generator 22.

  As a result, the upper pipes 112 a and 112 b and the lower pipes 112 c and 112 d can be made common to the motor 20 and the generator 22. In addition to this, formation or processing of the holes 116a to 116d (first to fourth holes) in the upper pipes 112a and 112b and the lower pipes 112c and 112d can be performed collectively by the motor 20 and the generator 22. . Therefore, the production efficiency of the vehicle 10 can be improved.

  In particular, when the upper pipes 112a and 112b (first refrigerant flow path) and the lower pipes 112c and 112d (second fluid flow path) are formed of pipes of common specifications, the holes 116a (first hole) and 116c (first flow path) are formed. 3 holes) have a common specification, and the holes 116b (second hole) and the hole 116d (fourth hole) have a common specification, which facilitates processing.

  In the present embodiment, the straight pipes 112a to 112d in which the holes 116a to 116d are formed are arranged along the rotation axis directions X1 and X2. For this reason, it becomes possible to supply a refrigerant | coolant to both the coil ends 50a, 50b, 80a, 80b in the motor stator 32 or the generator stator 62 from each pipe 112a-112d.

  In the present embodiment, the refrigerant is supplied to the upper coils 48 and 78 of the motor stator 32 and the generator stator 62 using the two upper pipes 112a and 112b. Accordingly, the upper sides of the motor stator 32 and the generator stator 62 are divided into two places to cool the coils 48 and 78. Therefore, it becomes easy to make cooling uniform.

  In the present embodiment, the refrigerant is supplied to the coils 48 and 78 on the sides of the motor stator 32 and the generator stator 62 using the two lower pipes 112c and 112d in addition to the upper pipes 112a and 112b. Therefore, compared to the case of only the upper pipes 112a and 112b, it becomes easier to supply the refrigerant to the sides of the motor stator 32 and the generator stator 62 (parts exposed to the sides of the coils 48 and 78, in particular). . Therefore, it becomes easy to make cooling uniform.

B. Modifications It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the description in this specification. For example, the following configuration can be adopted.

1. Applicable object (cooling structure)
In the said embodiment, although the electric vehicle 10 which is a hybrid vehicle was mentioned as a cooling structure, if it is a structure provided with a rotary electric machine and needs to cool this, it will not restrict to this. For example, the vehicle 10 may be an electric vehicle or a fuel cell vehicle that does not have an engine and uses only the motor 20 as a drive source. Alternatively, the present invention is applied by using a device such as an industrial machine (for example, a manufacturing apparatus, a machine tool, or an elevator) or a household appliance (for example, a washing machine, a vacuum cleaner, an air conditioner, a refrigerator, or an electromagnetic cooker) as a cooling structure. It is also possible.

2. Motor 20 and generator 22 (rotary electric machine)
In the above embodiment, the motor 20 and the generator 22 are cited as the rotating electrical machine cooled by the vehicle 10 as the cooling structure, but only one of the motor 20 and the generator 22 may be used as long as it is a rotating electrical machine.

  In the above embodiment, the motor 20 and the generator 22 are for driving the vehicle 10, but from the viewpoint of a rotating electrical machine that requires cooling, other uses (for example, an electric power steering, an air conditioner, A motor in an air compressor or the like).

  In the above embodiment, the motor 20 is a three-phase alternating current type, but is not limited thereto. In the above embodiment, the motor 20 is a brushless type, but may be a brush type. In the above embodiment, the motor stator 32 is disposed on the radially outer side (R2 direction) of the motor rotor 30 (see FIG. 2). However, the motor stator 32 is not limited to this, and the motor stator 32 is radially inner side of the motor rotor 30 (R1 direction). May be arranged. The same applies to the generator 22.

  In the above embodiment, the phases of the motor stator 32 and the generator stator 62 are matched. That is, the positions where the coils 48 and 78 exist in the circumferential directions C1 and C2 are arranged to coincide with each other. However, a configuration in which the phases of the motor stator 32 and the generator stator 62 are not matched is possible.

3. Object to be cooled The portion of the motor stator 32 of the above embodiment that supplies the coolant is the coil ends 50a and 50b protruding from the stator core 40 in both the rotation axis directions X1 and X2, but either one of the coil ends 50a and 50b is used. A configuration in which only the refrigerant is supplied is also possible. The same applies to the generator stator 62.

4). Refrigerant In the above-described embodiment, the supply amount of the refrigerant is equalized in each of the pipes 112a to 112d and the holes 116a to 116d, but may be different depending on the specifications of the motor stator 32 and the generator stator 62.

5. Refrigerant flow path 104
[5-1. Pipes 112a to 112d]
In the above embodiment, the two upper pipes 112a and 112b are used to supply the refrigerant to the upper coil 48 of the motor stator 32. However, the refrigerant is supplied to the side of the motor stator 32 (lower pipe 112c). 112d), a configuration in which only one upper pipe is provided or a configuration in which the upper pipes 112a and 112b are not provided is also possible. In the case of a configuration in which only one upper pipe is provided, the one upper pipe is disposed immediately above the rotation axis Ax (on the straight line L1), and the axial direction of the holes 116a and 116b is relative to the straight line L1. It is preferable that the angles formed are equal (for example, any angle of 30 ° to 60 ° for each). The same applies to the generator stator 62.

  In the above embodiment, the two lower pipes 112c and 112d are used to supply the refrigerant to the coil 48 on the side of the motor stator 32. However, the refrigerant is supplied to the upper side of the motor stator 32 (upper pipe 112a). 112b), a configuration in which the lower pipes 112c and 112d are not provided or a configuration in which only one of the lower pipes 112c and 112d is provided is also possible.

  In the above embodiment, in order to supply the refrigerant to the motor stator 32, the pipes 112a to 112d are arranged along the rotation axis directions X1 and X2 (see FIG. 2 and the like), but attention is paid to the formation of the holes 116a to 116d. For example, the number of pipes 112a to 112d is not limited to four, but may be one to three or five or more. For example, when the refrigerant is supplied to the coil ends 50a and 50b of the motor stator 32 with two pipes, the circumference is on a virtual plane (including the coil ends 50a and 50b) perpendicular to the rotation axis directions X1 and X2. Two curved pipes are provided along the directions C1 and C2, and the pipes are arranged at positions corresponding to the positions of the holes 116a to 116d in the pipes 112a to 112d, and eight places are provided for each of the two pipes. The holes 116a to 116d may be formed. The same applies to the generator stator 62.

  In the above embodiment, the pipes 112a to 112d have a common specification, but each may have a different specification.

  In the above embodiment, the convex portions 120 of the pipes 112a to 112d and the concave portion 122 of the housing 90 are used for positioning the pipes 112a to 112d, but other methods (e.g., visual inspection by an operator, image sensor) ), The pipes 112a to 112d may be positioned.

  In the above embodiment, the pipes 112a to 112d are used as the members for forming the holes 116a to 116d, but from the viewpoint of the refrigerant flow path 104 in which the holes 116a to 116d are formed, members other than the pipes 112a to 112d ( For example, the refrigerant flow path 104 may be provided in the housing 90) to form the holes 116a to 116d.

  In the embodiment described above, the upper pipes 112a and 112b are arranged substantially symmetrically with the straight line L1 interposed therebetween when viewed in the rotation axis directions X1 and X2, but other arrangements may be adopted. Similarly, in the above-described embodiment, the lower pipes 112c and 112d are disposed substantially symmetrically with the straight line L1 interposed therebetween when viewed in the rotation axis directions X1 and X2, but other arrangements may be employed.

  In the above embodiment, when viewed in the rotation axis directions X1 and X2, the pipes 112a to 112d are arranged substantially concentrically (see FIGS. 5 and 6), and the lower pipes 112c and 112d are connected to the upper pipes 112a and 112b. Is arranged on the lower side, but other arrangements may be adopted. For example, when viewed in the rotation axis directions X1 and X2, the pipes 112a to 112d may be arranged in a straight line in the horizontal direction (Y1 and Y2 directions), and the pipes 112a to 112d may be arranged at the same height. Alternatively, the pipes 112c and 112d can be arranged above the pipes 112a and 112b.

[5-2. Holes 116a to 116d]
(5-2-1. Placement and number)
In the above embodiment, the holes 116a to 116d are aligned with the positions of the rotation axis directions X1 and X2 corresponding to the coil ends 50a, 50b, 80a, and 80b. For example, the holes 116a to 116d corresponding to the coil end 50a are arranged on the same virtual plane perpendicular to the rotation axis directions X1 and X2. However, the holes 116a to 116d can be arranged by shifting the positions of the rotation axis directions X1 and X2 corresponding to the coil ends 50a, 50b, 80a, and 80b.

  In the above embodiment, two holes (holes 116a to 116d) are formed in each of the pipes 112a to 112d corresponding to the coil ends 50a, 50b, 80a, and 80b, but the coil ends 50a, 50b, 80a, and 80b From the viewpoint of supplying the refrigerant to any of the holes, the holes 116a to 116d may be formed corresponding to only one to three of the coil ends 50a, 50b, 80a, and 80b. Further, for example, from the viewpoint of supplying the refrigerant using four pipes 112a to 112d, the holes formed in the pipes 112a to 112d corresponding to the coil ends 50a, 50b, 80a, and 80b should be two places, respectively. It is good also as one place or three places or more.

  In the above-described embodiment, the holes 116a to 116d are opposed to not only the gaps between the plurality of coils 48 (see FIG. 3) but the portions where the coils 48 are exposed (outer surface) in each of the coil ends 50a and 50b. However, if attention is paid to the number and arrangement of the pipes 112 a to 112 d or the number of the holes 116 a to 116 d, the holes 116 a to 116 d may be opposed to the gaps between the plurality of coils 48.

  In the above embodiment, the holes 116a to 116d are arranged corresponding to the coil ends 50a, 50b, 80a, and 80b, but from the viewpoint of cooling the motor stator 32 or the generator stator 62, the holes 116a to 116d are You may arrange | position corresponding to parts (for example, stator cores 40 and 70) other than coil end 50a, 50b, 80a, 80b.

(5-2-2. Direction or axial direction)
In the above embodiment, the angle formed by the axes of the holes 116a and 116b (the first hole and the second hole) is equal to the angle formed by the axes of the holes 116c and 116d (the third hole and the fourth hole). It is also possible to make the configurations different.

  In the above embodiment, when viewed from the rotation axis directions X1 and X2, the axial direction of the hole 116c (inclination of the arrow D3) is farther from the vertically downward direction (Z2 direction) than the axial direction of the hole 116a (inclination of the arrow D1). The axial direction of the hole 116d (inclination of the arrow D4) was closer to the vertically downward direction (Z2 direction) than the axial direction of the hole 116b (inclination of the arrow D2). However, for example, from the viewpoint of supplying the refrigerant using the four pipes 112a to 112d, when viewed from the rotation axis directions X1 and X2, the axial direction of the hole 116c (inclination of the arrow D3) is the same as that of the hole 116a. It is equal to the axial direction (inclination of arrow D1) or closer to the vertical downward direction (Z2 direction) than the axial direction of the hole 116a (inclination of arrow D1), and the axial direction of the hole 116d (inclination of arrow D4) is It is also possible to be equal to the axial direction (inclination of arrow D2) or farther from the vertically downward direction (Z2 direction) than the axial direction of the hole 116b (inclination of arrow D2).

(5-2-3. Dimensions)
In the above embodiment, the dimensions of the holes 116a to 116d are made equal, but may be made different in consideration of the required refrigerant flow rate and the like.

(5-2-4. Others)
In the above embodiment, the distances between the holes 116a to 116b and the coil ends 50a, 50b, 80a, and 80b are substantially equal, but the distances may be different.

DESCRIPTION OF SYMBOLS 10 ... Vehicle (cooling structure) 20 ... Motor (rotary electric machine)
DESCRIPTION OF SYMBOLS 22 ... Generator (rotary electric machine) 32 ... Motor stator 40 ... Stator core 44 of motor stator ... Conductor wire of motor stator 46 ... Motor stator teeth 48 ... Coil 50a, 50b of motor stator ... Coil end 62 of motor stator ... Generator stator 70 ... Generator stator stator core 74 ... Generator stator conductor wire 76 ... Generator stator teeth 78 ... Generator stator coils 80a, 80b ... Generator stator coil ends 104 ... Refrigerant flow path
112a, 112b ... Upper pipe (first refrigerant flow path)
112c, 112d ... lower pipe (second refrigerant flow path)
116a ... hole (first hole) 116b ... hole (second hole)
116c ... hole (third hole) 116d ... hole (fourth hole)
Ax ... Rotation axis X1, X2 ... Rotation axis direction Z2 ... Vertical downward

Claims (6)

A ring-shaped stator core erected in the vertical direction so that the rotation axis is horizontal;
A plurality of coils formed by winding conductive wires around a plurality of teeth protruding radially inward from the stator core;
A cooling structure for a rotating electrical machine comprising: a plurality of coils arranged above a coil end that is a portion protruding from the stator core in a rotation axis direction; and a refrigerant flow path through which a refrigerant flows.
The refrigerant flow path includes a first refrigerant flow path and a second refrigerant flow path arranged along the rotation axis direction,
When viewed in the direction of the rotation axis, the first refrigerant flow path has a shorter distance to the vertical straight line passing through the rotation axis than the second refrigerant flow path,
When viewed in the direction of the rotation axis, the first refrigerant flow path includes a first hole facing the rotation axis and a second hole facing the rotation axis, and the second refrigerant flow The path includes a third hole facing the rotation shaft side and a fourth hole facing the rotation shaft side,
The refrigerant is injected or dripped into the coil end through the first hole, the second hole, the third hole, and the fourth hole,
When viewed in the rotational axis direction, the axial direction of the third hole is farther from the vertically downward direction than the axial direction of the first hole, and the axial direction of the fourth hole is more than the axial direction of the second hole. A cooling structure for a rotating electrical machine characterized by being vertically downward. The cooling structure for a rotating electrical machine according to claim 1,
The first hole, the second hole, the third hole, and the fourth hole are opposed to a portion where the coil is exposed, not a gap between the plurality of coils, in the coil end. A cooling structure for a rotating electric machine characterized by the above. The cooling structure for a rotating electrical machine according to claim 1 or 2,
The cooling structure for a rotating electrical machine, wherein the second refrigerant flow path is disposed at a position lower than the first refrigerant flow path. The cooling structure for a rotating electrical machine according to any one of claims 1 to 3,
The first refrigerant flow path and the second refrigerant flow path are composed of a plurality of pipes having a common specification,
The angle formed by the axes of the first hole and the second hole is equal to the angle formed by the axes of the third hole and the fourth hole. In the cooling structure for a rotating electrical machine according to any one of claims 1 to 4,
The cooling structure includes a plurality of rotating electric machines having a common rotating shaft,
The stator of each of the plurality of rotating electrical machines is configured such that the coils are arranged so as to be in phase with each other, and the outer diameters of the coil ends are substantially equal.
The refrigerant flow path is arranged linearly across the top of the plurality of rotating electrical machines and along the rotation axis direction,
In the first refrigerant flow path, the first hole and the second hole are formed for each of the plurality of rotating electrical machines,
In the second refrigerant channel, the third hole and the fourth hole are formed for each of the plurality of rotating electrical machines,
The first hole, the second hole, the third hole, and the fourth hole have the same angle when viewed from the direction of the rotation axis for any of the rotating electric machines. body. A ring-shaped stator core erected in the vertical direction so that the rotation axis is horizontal;
A plurality of coils formed by winding conductive wires around a plurality of teeth protruding radially inward from the stator core;
A rotating electrical machine cooling structure comprising: at least one refrigerant flow path that circulates a refrigerant that is supplied to a coil end that is a portion of the plurality of coils protruding from the stator core in the rotation axis direction and that cools the plurality of coils. There,
When viewed in the rotation axis direction, the at least one refrigerant flow path includes an upper hole group including an upper inner hole and an upper outer hole, and a lower hole group including a lower inner hole and a lower outer hole. A plurality of lines are formed symmetrically with respect to a vertical straight line including the axis,
The upper hole group is disposed at a position above the lower hole group and close to the straight line in the vertical direction when viewed in the rotation axis direction.
The upper inner hole discharges the refrigerant toward the rotating shaft with respect to the upper coil end,
The upper outer hole discharges the refrigerant toward the opposite side of the rotating shaft with respect to the upper coil end,
The lower inner hole discharges the refrigerant toward the rotating shaft side with respect to a side coil end,
The lower outer hole discharges the refrigerant toward the side opposite to the rotation shaft with respect to the side coil end,
When viewed in the rotational axis direction, the axial direction of the lower inner hole is farther from the vertical downward direction than the axial direction of the upper inner hole,
When viewed in the rotation axis direction, the axial direction of the lower outer hole is closer to the vertically downward direction than the axial direction of the upper outer hole.

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