JP2021069251A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of preventing deterioration of cooling performance of a stator core by oil even when a key member is provided between a stator core and a case portion in a radial direction. SOLUTION: The rotary electric machine 100 includes a case portion 3 for accommodating a rotor 1 and a stator core 21, and a key member 4 for positioning the stator core 21 in the circumferential direction with respect to the case portion 3. The case portion 3 is provided with an oil passage 51 formed along the circumferential direction and through which oil Lq for cooling the stator core 21 flows. The key member 4 is provided with an oil passage 52 which is provided in the oil passage 51 so as to be continuous in the circumferential direction and allows oil Lq to flow in the circumferential direction. [Selection diagram] Fig. 5

Description

The present invention relates to a rotary electric machine.

Conventionally, a rotary electric machine provided with a stator is known (see, for example, Patent Document 1).

Patent Document 1 discloses a rotary electric machine including a stator, a rotor, and a case. In this rotary electric machine, the stator core of the stator is fixed to the case by shrink fitting. A cooling groove is formed on the inner peripheral surface of the case along the circumferential direction to allow the cooling liquid to flow. Further, the stator core is provided with a positioning protrusion for radially outwardly projecting from the outer peripheral surface and for positioning the case in the circumferential direction. Further, the case is formed with a positioning groove that is recessed outward in the radial direction at a position corresponding to the positioning protrusion. Then, a coolant flow path for flowing the coolant in the axial direction is formed between the positioning protrusion and the positioning groove. Then, in this rotary electric machine, the coolant flowing in the circumferential direction in the cooling groove abuts on the positioning protrusion, and the coolant flows in the coolant flow path so as to bypass the positioning protrusion in the radial direction. Then, in the coolant flow path, the direction in which the coolant flows is changed from the circumferential direction to the axial direction.

Japanese Unexamined Patent Publication No. 2009-22145

However, in the rotary electric machine described in Patent Document 1, the coolant flowing in the circumferential direction in the cooling groove hits the positioning protrusion, and the cooling liquid bypasses the positioning protrusion in the radial direction in the coolant flow path. It flows. For this reason, it is considered that the flow of the coolant is obstructed by the amount that the coolant bypasses the positioning protrusion, and it becomes difficult to cool the portion radially inside the portion where the coolant is bypassed (positioning protrusion). Be done. As a result, it is considered that the cooling performance of the stator core by the coolant deteriorates due to the cooling liquid bypassing the positioning protrusion. Here, in order to position the stator core with respect to the case in the circumferential direction, it is conceivable to provide a key member in the rotary electric machine between the stator core and the case in the radial direction instead of the positioning protrusion. However, even in the configuration in which the key member is provided in the rotary electric machine, it is necessary for the coolant to bypass the key member. Therefore, the coolant is used as in the rotary electric machine described in Patent Document 1 in which the positioning protrusion is provided. It is considered that the cooling performance for the stator core is reduced. Therefore, even when the key member is provided between the stator core and the case (case portion) in the radial direction, it is possible to prevent the cooling performance of the stator core from being deteriorated by the coolant (oil for cooling). An electric machine is desired.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide an oil-based stator core even when a key member is provided between the stator core and the case portion in the radial direction. It is an object of the present invention to provide a rotary electric machine capable of preventing the cooling performance from being deteriorated.

In order to achieve the above object, the rotary electric machine according to one aspect of the present invention includes a rotor, a stator having a stator core arranged so as to face the radial outer side of the rotor, and a case portion for accommodating the rotor and the stator core. A key member that is arranged between the case portion and the stator core in the radial direction and that positions the stator core in the circumferential direction with respect to the case portion is provided, and the case portion is formed along the circumferential direction to provide the stator core. A case oil passage for circulating oil for cooling is provided, and the key member is continuous with the case oil passage in the circumferential direction and is a key member for circulating oil for cooling the stator core in the circumferential direction. An oil passage is provided.

In the rotary electric machine according to one aspect of the present invention, as described above, the key member oil passage that is continuous with the oil passage of the case portion in the circumferential direction and that allows oil for cooling the stator core to flow in the circumferential direction is used as the key member. Provide. As a result, even when the rotary electric machine is provided with the key member, the oil is circulated in the circumferential direction through the key member oil passage that is continuous in the circumferential direction to the case portion oil passage that circulates the oil in the circumferential direction (oil causes the key member). Can pass in the circumferential direction). As a result, even when the key member is provided, it is not necessary to divert the oil to the key member, so that it is possible to prevent the oil flow from being obstructed and the oil flowing through the key member oil passage can be used. The radial inner part (stator core) of the key member can be cooled. As a result, even when the key member is provided between the stator core and the case portion in the radial direction, it is possible to prevent the cooling performance of the stator core from being deteriorated by the oil for cooling the stator core.

According to the present invention, even when the key member is provided between the stator core and the case portion in the radial direction, it is possible to prevent the cooling performance of the stator core from being deteriorated by the oil for cooling the stator core.

It is a top view which shows the structure of the rotary electric machine by 1st Embodiment. It is sectional drawing along the radial direction which shows the structure of the case part and the key member by 1st Embodiment. It is a schematic diagram for demonstrating the structure of the oil passage by 1st Embodiment. It is sectional drawing which shows the structure of the cutout part of the key member by 1st Embodiment. It is a top view which shows the structure of the oil passage by 1st Embodiment. It is a top view which shows the structure of the rotary electric machine by 2nd Embodiment. It is sectional drawing which shows the structure of the key member by 2nd Embodiment. It is a figure which shows the structure of the rotary electric machine (key member) by the 1st modification of 1st and 2nd Embodiment. It is a figure which shows the structure of the rotary electric machine (key member) by the 2nd modification of 1st and 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Structure of rotating electric machine)
The configuration of the rotary electric machine 100 according to the first embodiment will be described with reference to FIGS. 1 to 5.

In the present specification, the "axial direction" means a direction along the rotation axis (central axis C1) of the rotor 1 (stator 2), and means the Z direction in the drawing. Further, the "diameter direction" means the radial direction of the rotor 1, the "diameter inside" means the R1 direction in the drawing, and the "diameter outside" means the R2 direction in the drawing. Further, the "circumferential direction" means the circumferential direction (E1 direction or E2 direction) of the rotor 1.

As shown in FIG. 1, the rotary electric machine 100 includes a rotor 1, a stator 2, a case portion 3, and a key member 4. For example, the rotary electric machine 100 is configured as a motor, a generator, or a motor / generator, and is configured to be mounted on a vehicle. Further, the rotor 1 and the stator 2 are each formed in an annular shape. The rotor 1 is arranged so as to face the inside of the stator 2 in the radial direction. That is, in the first embodiment, the rotary electric machine 100 is configured as an inner rotor type rotary electric machine.

(Constituent configuration)
The stator 2 includes a stator core 21 and a coil 22 arranged on the stator core 21. The stator core 21 is configured such that, for example, a plurality of electromagnetic steel sheets (silicon steel sheets) are laminated in the axial direction so that magnetic flux can pass through the stator core 21. Further, the stator core 21 includes a back yoke 21a, a plurality of tooth portions 21b protruding inward in the radial direction from the back yoke 21a, and a slot portion 21c formed between the tooth portions 21b adjacent to each other in the circumferential direction.

As shown in FIG. 2, the stator core 21 is provided with a core key groove portion 23 in which the key member 4 is arranged. Specifically, the core key groove portion 23 is formed so as to be recessed inward in the radial direction with respect to the outer peripheral surface 24 of the stator core 21. Further, the core key groove portion 23 is formed from the end surface 21d on one side in the axial direction of the stator core 21 to the end surface 21e on the other side in the axial direction. Further, as shown in FIG. 3, the recess depth of the core key groove portion 23 with respect to the outer peripheral surface 24 is d1. Then, as shown in FIG. 1, the core key groove portions 23 are provided at equal angular intervals at the same radial position about the central axis C1 when viewed in the axial direction.

The coil 22 is wound around a plurality of teeth portions 21b. The coil 22 is arranged in each slot portion 21c. The coil 22 is connected to an external power supply unit, and is configured to supply electric power (for example, three-phase alternating current electric power). The coil 22 is configured to generate a magnetic field when electric power is supplied. Although only a part of the coil 22 is shown in FIG. 1, the coil 22 is arranged over the entire circumference of the stator core 21.

(Case configuration)
As shown in FIG. 1, the case portion 3 is configured to accommodate the rotor 1 and the stator core 21. Further, the case portion 3 is arranged so that at least a part of the inner peripheral surface 31 of the case portion 3 supports the outer peripheral surface 24 of the stator core 21. Then, the stator core 21 is housed in the case portion 3 in a state of being gap-fitted with respect to the case portion 3. That is, as shown in FIG. 3, a gap CL1 is provided between (at least a part of) the inner peripheral surface 31 of the case portion 3 and the outer peripheral surface 24 of the stator core 21 in the radial direction.

Further, in the first embodiment, the case portion 3 is composed of a single member (case member) in which the oil passage 51 is formed. For example, the case portion 3 is made of an aluminum alloy and is made of casting. Further, the oil passage 51 is formed along the circumferential direction of the case portion 3 and is configured to circulate oil Lq (see FIG. 5) for cooling the stator core 21. Further, the oil Lq is, for example, ATF (Automatic Transmission Fluid). A detailed description of the oil passage 51 will be described later. Further, the oil passage 51 is an example of the "case portion oil passage" in the claims.

Specifically, the case portion 3 is formed with a plurality of groove portions 32 forming an oil passage 51 that is recessed outward in the radial direction with respect to the inner peripheral surface 31 of the case portion 3. Further, the plurality of groove portions 32 are formed so as to extend in the circumferential direction along the inner peripheral surface 31. The plurality of groove portions 32 are provided so as to be separated from each other in the circumferential direction by a case portion key groove portion 35 described later. That is, the plurality of groove portions 32 are separated from each other in the circumferential direction. For example, as shown in FIG. 1, when viewed in the axial direction, it is divided into three groove portions 32 in the circumferential direction by the three case portion key groove portions 35. For example, the groove portion 32 is formed by cutting the cast case portion 3. Further, the groove depth (depth to the bottom) in the radial direction with respect to the inner peripheral surface 31 of the groove portion 32 is d2. The groove portion 32 is formed in a rectangular shape, for example. The groove portion 32 is not limited to a rectangular shape, and may be formed in a U-shape (arc shape) or the like. The groove portion 32 is an example of the “groove portion for an oil passage” within the scope of the claims.

Further, the case portion 3 is provided with a supply port 33 for supplying the oil Lq from the outside to the oil passage 51. For example, the supply port 33 is formed as a through hole that penetrates the case portion 3 in the radial direction. Further, the case portion 3 is provided with a discharge port 34 for discharging the oil Lq from the oil passage 51 to the outside. For example, the discharge port 34 is formed as a through hole that penetrates the case portion 3 in the radial direction. For example, the supply port 33 is provided on one side of the case portion 3 in the axial direction, and the discharge port 34 is provided on the other side of the case portion 3 in the axial direction.

Further, the case portion 3 is provided with a case portion key groove portion 35 in which the key member 4 is arranged. Specifically, the case portion key groove portion 35 is formed so as to be recessed inward in the radial direction with respect to the inner peripheral surface 31 of the case portion. Further, the recess depth of the case portion key groove portion 35 with respect to the inner peripheral surface 31 is d3. For example, the recess depth d3 of the case portion key groove portion 35 is larger than the groove depth d2 of the groove portion 32. Further, the case portion key groove portion 35 is formed at a position that faces the core key groove portion 23 in the radial direction.

(Structure of key member)
As shown in FIG. 2, the key member 4 is provided separately from the case portion 3 and the stator core 21. The key member 4 is arranged between the case portion 3 and the stator core 21 in the radial direction, and has a function of positioning (phase determining) the stator core 21 in the circumferential direction with respect to the case portion 3.

Further, the key member 4 is formed in a columnar shape extending in the axial direction. For example, the key member 4 is formed from (near) one end face 21d (near) on one side in the axial direction of the stator core 21 to (near) 21e (near) on the other side in the axial direction. Then, in the first embodiment, the key member 4 is arranged so as to straddle a position radially inside the outer peripheral surface 24 of the stator core 21 to a position radially outside the outer peripheral surface 24. That is, the key member 4 is arranged so as to straddle the outer peripheral surface 24 of the stator core 21 and the inner peripheral surface 31 of the case portion 3 in the radial direction. Specifically, the key member 4 is arranged so as to straddle the case portion key groove portion 35 and the core key groove portion 23.

As shown in FIG. 5, the key member 4 is provided with an oil passage 52 which is provided in the oil passage 51 so as to be continuous in the circumferential direction and allows oil Lq to flow in the circumferential direction. That is, the oil passage 52 has a function of passing the oil Lq through the key member 4 in the circumferential direction. The oil passage 52 is an example of the "key member oil passage" in the claims.

Further, the key member 4 is provided at a circumferential position different from the circumferential position of the supply port 33, and is provided at a circumferential position different from the circumferential position of the discharge port 34. Specifically, a plurality of key members 4 are provided at equal angular intervals at the same radial position about the central axis C1 when viewed in the axial direction. An oil passage 52 is provided in each of the plurality of key members 4. For example, three key members 4 are provided.

(Construction of oil passage)
As shown in FIGS. 4 and 5, the oil passage 52 and the oil passage 51 are formed so as to be continuous in the circumferential direction. Further, the oil passage 52 is formed so as to connect a plurality of groove portions 32 (oil passage 51) separated from each other in the circumferential direction in the circumferential direction. Here, in the first embodiment, the rotary electric machine 100 surrounds the entire circumference of the outer peripheral surface 24 of the stator core 21 by making the oil passage 52 of the key member 4 continuous with the oil passage 51 of the case portion 3 in the circumferential direction. The oil passage 5 is formed in the air passage 5. That is, the oil passage 5 is an oil Lq flow passage that surrounds the outer peripheral surface 24 from the supply port 33 to the oil passages 51 and 52 and the discharge port 34. Further, in the first embodiment, the oil passage 5 is configured to have a spiral shape continuous from the supply port 33 to the discharge port 34 by making the oil passage 52 continuous with the oil passage 51 in the circumferential direction. In other words, the oil passage 5 is formed in a single stroke from the supply port 33 to the discharge port 34.

As shown in FIG. 3, the oil passage 52 is formed in a portion 4a of the key member 4 that is radially outer of the outer peripheral surface 24 of the stator core 21. That is, the oil passage 52 is provided in the portion 4a of the key member 4 arranged in the case portion key groove portion 35. Specifically, the key member 4 is formed with a plurality of notched portions 41 constituting the oil passage 52. The oil passage 52 is composed of a notch 41. For example, the notch 41 is formed in a rectangular shape.

Here, in the first embodiment, the depth d2 of the groove portion 32 is larger than the depth d4 of the notch portion 41. Further, in the axial direction of the stator core 21, the length L2 of the oil passage 52 is equal to or greater than the length L1 of the oil passage 51 (see FIG. 4). For example, the length L2 and the length L1 have the same magnitude.

[Second Embodiment]
Next, the configuration of the rotary electric machine 200 according to the second embodiment will be described with reference to FIGS. 6 and 7. In the second embodiment, unlike the first embodiment in which the oil passage 52 is formed by the cutout portion 41, the oil passage 252 is formed by the hole portion 241. The same structures and steps as those in the first embodiment are designated by the same reference numerals (step numbers), and the description thereof will be omitted.

As shown in FIG. 6, the rotary electric machine 200 according to the second embodiment includes a case portion 203 and a key member 204. The case portion 203 is provided with a groove portion 232 for circulating oil Lq and a case portion key groove portion 235. In the second embodiment, the recess depth d11 of the groove portion 232 is smaller than the depth d12 of the case portion key groove portion 235. The groove portion 232 constitutes an oil passage 251 along the circumferential direction of the stator core 21. The configuration of the oil passage 251 is the same as that of the oil passage 51 according to the first embodiment.

The key member 204 is arranged so as to straddle the core key groove portion 23 and the case portion key groove portion 235. The key member 204 is provided with a plurality of holes 241 constituting the oil passage 252. The hole portion 241 is arranged adjacent to the groove portion 232 in the circumferential direction, and has a function of connecting the oil passage 251 and the oil passage 252. As shown in FIG. 7, the hole 241 is formed in a circular shape, for example. The other configurations of the second embodiment are the same as the configurations of the first embodiment.

[Effects of Manufacturing Methods of First and Second Embodiments]
In the first and second embodiments, the following effects can be obtained.

In the first and second embodiments, as described above, the oil passages (51, 251) in the case portion are continuous in the circumferential direction, and the oil (Lq) for cooling the stator core (21) is circulated in the circumferential direction. Key member oil passages (52, 252) are provided in the key members (4, 204). As a result, even when the rotary electric machine (100, 200) is provided with the key member (4, 204), the key continuous in the circumferential direction with the case portion oil passage (51, 251) through which the oil (Lq) is circulated in the circumferential direction. The member oil passages (52, 252) allow the oil (Lq) to flow in the circumferential direction (the oil (Lq) passes through the key member (4, 204) in the circumferential direction). As a result, even when the key member (4, 204) is provided, it is not necessary to divert the oil (Lq) to the key member (4, 204), so that the flow of the oil (Lq) is prevented from being obstructed. In addition, the oil (Lq) flowing through the key member oil passages (52, 252) can cool the radial inner portion of the key member (4, 204). As a result, even when the key member (4, 204) is provided between the stator core (21) and the case portion (3, 203) in the radial direction, the stator core is made of oil (Lq) for cooling the stator core (21). It is possible to prevent the cooling performance for (21) from deteriorating.

Further, in the first and second embodiments, as described above, the case portion (3, 203) is provided with the case portion key groove portion (35, 235) in which a part of the key member (4, 204) is arranged. At least a part of the inner peripheral surface (31) of the case portion (3, 203) is arranged so as to support the outer peripheral surface (24) of the stator core (21), and the case portion oil passage (51) is arranged. , 251) are provided so as to be separated from each other by a case portion key groove portion (35, 235) in the circumferential direction, and a plurality of oils recessed radially outward with respect to the inner peripheral surface (31) of the case portion (3, 203). It is configured as a road groove (32, 232), and a plurality of oil passage grooves (32, 232) separated from each other in the circumferential direction are connected to the key member (4,204) in the circumferential direction. , Key member oil passages (52, 252) are provided. With this configuration, the oil (Lq) for cooling the stator core (21) is supplied to the stator core (21) by the key member oil passages (52, 252) formed by the oil passage grooves (32, 232). It can be directly cooled by being brought into contact with the outer peripheral surface (24). As a result, the cooling performance can be improved as compared with the case of indirectly cooling the case portion oil passages (51, 251) and the stator core (21) via another member. Then, as in the first and second embodiments, the key members (4, 204) are connected in the circumferential direction to a plurality of oil passage grooves (32, 232) separated from each other in the circumferential direction. By providing the key member oil passages (52, 252), even when a plurality of oil passage grooves (32, 232) are separated (divided) from each other, the oil (Lq) is provided by the key member (4, 204). ) Can be prevented from being hindered by the key member oil passages (52, 252).

Further, in the first and second embodiments, as described above, the outer peripheral surface (24) of the stator core (21) is formed to face the key groove portion (35, 235) of the case portion in the radial direction. , A core key groove portion (23) in which the key member (4, 204) is arranged is provided, and the key member (4, 204) straddles the core key groove portion (23) and the case portion key groove portion (35, 235). The key member oil passage (52) is arranged so as to connect a plurality of oil passage grooves (32, 232) in the circumferential direction, so that the stator core (21) of the key members (4, 204) is connected. It is formed on a portion (4a) radially outside the outer peripheral surface (24) of the above. With this configuration, compared to the case where the key member oil passages (52, 252) are formed in the radial inner portion of the key member (4, 204), the key member oil passage (52, 252) is larger than the outer peripheral surface (24) of the stator core (21). The radial position of the case portion oil passage (51, 251) provided on the outer side in the radial direction and the radial position of the key member oil passage (52, 252) can be made closer or coincident with each other. it can. As a result, when the oil (Lq) flows over the case portion oil passage (51, 251) and the key member oil passage (52, 252) as the change in the radial position where the oil (Lq) flows becomes smaller. In addition, it is possible to prevent the fluidity of the oil (Lq) from decreasing.

Further, in the first and second embodiments, as described above, the key member oil passages (52, 252) are notched portions (41) for connecting a plurality of oil passage groove portions (32) in the circumferential direction, or , The plurality of oil passage groove portions (32) are formed as holes (241) connecting in the circumferential direction. With this configuration, the key member oil passage (52, 252) can be easily formed by forming the notch portion (41) or the hole portion (241) in the key member (4, 204). it can.

Further, in the first embodiment, as described above, the key member oil passage (52) is composed of the notch portion (41), and the depth (d2) of the oil passage groove portion (32) is cut. It is larger than the depth (d4) of the notch (41). With this configuration, it is possible to further prevent the fluidity of the oil (Lq) from being lowered due to the relatively deep groove portion (32) in addition to the notch portion (41) or the hole portion (241). it can.

Further, in the first and second embodiments, as described above, the length (L2) of the key member oil passages (52, 252) in the axial direction of the stator core (21) is set to the case portion oil passages (51, 251). ) Is greater than or equal to the length (L1). With this configuration, the fluidity in the key member oil passages (52, 252) can be improved by the amount that the length (L2) in the axial direction is large. As a result, it is possible to further prevent the fluidity of the oil (Lq) flowing through the case portion oil passages (51, 251) from being lowered by the key member oil passages (52, 252).

Further, in the first and second embodiments, as described above, the key member oil passages (52, 252) are continuous with the case portion oil passages (51, 251) in the circumferential direction, whereby the outer periphery of the stator core (21) is formed. An oil passage (5) is formed so as to surround the entire circumference of the surface (24). With this configuration, the entire circumference of the outer peripheral surface (24) of the stator core (21) can be surrounded by the continuous oil passage (5), so that the stator core (21) is uniformly cooled over the entire circumference. Can be done.

Further, in the first and second embodiments, as described above, the key member oil passages (52, 252) are continuous with the case portion oil passages (51, 251) in the circumferential direction to cool the stator core (21). An oil passage (5) having a continuous spiral shape extends from a supply port (33) for supplying oil (Lq) to a discharge port (34) for discharging oil (Lq) for cooling the stator core (21). It is configured to be formed. With this configuration, the oil (Lq) is supplied from the supply port (33) by the spiral-shaped oil passage (5), and the oil (Lq) takes a plurality of turns before being discharged from the discharge port (34). ) Flow around the stator core (21). As a result, more heat from the stator core (21) is transferred to the oil (Lq) than when the oil (Lq) is flowed around the stator core (21) for only one round. As a result, the cooling performance of the oil (Lq) on the stator core (21) can be improved. Further, unlike the case where the supply port and the discharge port are provided for each of the plurality of oil passages flowing around the stator core (21) for only one round, the number of supply ports (33) and discharge ports (34) is reduced. Therefore, the number of parts constituting the supply port (33) and the discharge port (34) can be reduced.

Further, in the first and second embodiments, as described above, the key members (4, 204) are positioned in the circumferential direction of the supply port (33) for supplying the oil (Lq) for cooling the stator core (21). It is provided at a circumferential position different from that of the circumferential position of the discharge port (34) for discharging oil (Lq) for cooling the stator core (21). With this configuration, the key member (4,204) is provided at the same circumferential position as the supply port (33) or the discharge port (34), and the supply port (33) is provided in the key member oil passage (52, 252). ) Or the discharge port (34) is provided, and it is possible to prevent the configuration of the key member (4, 204) (key member oil passage (52, 252)) from becoming complicated.

Further, in the first and second embodiments, as described above, the case portion (3, 203) is provided with a case portion key groove portion (35, 235) in which a part of the key member (4, 204) is arranged. At least a part of the inner peripheral surface (31) of the case portion (3, 203) is arranged so as to support the outer peripheral surface (24) of the stator core (21). It is housed in the case portion (3, 203) in a state of being gap-fitted with respect to the case portion (3, 203). With this configuration, the stator core (21) can be easily accommodated in the case portion (3, 203) as compared with the case where the stator core (21) is tightened and fitted to the case portion (3, 203). Can be done. Then, the oil (Lq) from the case portion oil passage (51, 251) is exuded into the radial gap (CL1) between the outer peripheral surface (24) of the stator core (21) and the case portion (3, 203). Therefore, in addition to the case portion oil passage (51, 251) and the key member oil passage (52, 252), the radial direction of the outer peripheral surface (24) of the stator core (21) and the case portion (3, 203) The stator core (21) can be cooled by the oil (Lq) also in the gap (CL1).

Further, in the first and second embodiments, as described above, the case portion (3, 203) is composed of a single case member in which the case portion oil passage (51, 251) is formed, and the key member oil passage is formed. (52, 252) are provided on the key member (4, 204) arranged between the single case member and the stator core (21) in the radial direction. With this configuration, unlike the case where the case portion (3, 203) is composed of a plurality of members, it is possible to prevent the number of parts of the rotary electric machine (100, 200) from increasing and the structure from becoming complicated. ..

Further, in the first and second embodiments, as described above, the key members (4, 204) are at equal angles with respect to the central axis (C1) when viewed in the direction of the central axis (C1) of the stator core (21). A plurality of key member oil passages (52, 252) are provided in each of the plurality of key members (4, 204). With this configuration, even when a plurality of key members (4, 204) are provided in the rotary electric machine (100, 200), the stator core (21) is cooled by oil (Lq) for cooling the stator core (21). It is possible to prevent the performance from deteriorating.

[Modification example]
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

(First modification)
For example, in the first embodiment described above, an example in which the notch portion is formed in a rectangular shape is shown, but the present invention is not limited to this. For example, in the key member 304 of the rotary electric machine 300 according to the first modification shown in FIG. 8, the notch portion 341 is formed in an arc shape.

(Second modification)
Further, in the second embodiment, an example in which the hole portion is formed in a circular shape is shown, but the present invention is not limited to this. For example, in the key member 404 of the rotary electric machine 400 according to the second modification shown in FIG. 9, the hole 441 is formed in a rectangular shape.

(Other variants)
Further, in the first and second embodiments, an example is shown in which the oil passage of the case portion is provided on the inner peripheral surface of the case portion so as to be in contact with the outer peripheral surface of the stator core. Not limited to this. For example, the oil passage of the case portion may be provided radially outside the inner peripheral surface of the case portion.

Further, in the first and second embodiments, an example in which the case portion is made of an aluminum alloy has been shown, but the present invention is not limited to this. For example, the case portion may be made of stainless steel, carbon steel, or the like.

Further, in the first and second embodiments, the case portion is formed by casting and the groove portion is formed by cutting, but the present invention is not limited to this. That is, the case portion may be formed by a method other than casting (cutting or forging). Further, the groove portion may be formed by a method other than cutting (such as when the case portion is cast).

Further, in the first and second embodiments, an example in which the oil for cooling the stator core is composed of ATF has been shown, but the present invention is not limited to this. That is, the oil for cooling the stator core may be composed of oil other than ATF (for example, oil dedicated to cooling the stay core).

Further, in the first and second embodiments, an example is shown in which the oil passage of the key member is formed in a portion of the key member that is radially outside the outer peripheral surface of the stator core, but the present invention is limited to this. I can't. That is, the oil passage of the key member may be formed in a portion of the key member that is radially inside the outer peripheral surface of the stator core.

Further, in the first and second embodiments, an example in which three key members are provided has been shown, but the present invention is not limited to this. That is, two or less or four or more key members may be provided.

Further, in the first and second embodiments, the depth of the groove portion of the case portion is set to be larger than the depth of the notch portion, but the present invention is not limited to this. That is, the depth of the groove portion of the case portion may be configured to be equal to or less than the depth of the notch portion.

Further, in the first and second embodiments, an example is shown in which the length of the oil passage of the key member is made longer than the length of the oil passage of the case portion in the axial direction of the stator core. Not limited to. That is, the length of the oil passage of the key member may be set to be less than the length of the oil passage of the case portion in the axial direction of the stator core.

Further, in the first and second embodiments, the oil passage of the key member is continuous with the oil passage of the case portion in the circumferential direction to form an oil passage so as to surround the entire circumference of the outer peripheral surface of the stator core. As shown, the present invention is not limited to this. That is, the oil passage of the key member and the oil passage of the case portion may be provided at a position corresponding to only a part of the outer peripheral surface of the stator core.

Further, in the first and second embodiments, the oil passage of the key member is continuous with the oil passage of the case portion in the circumferential direction to form an oil passage having a continuous spiral shape from the supply port to the discharge port. However, the present invention is not limited to this. That is, the oil passage may be formed in a shape other than the spiral shape.

Further, in the first and second embodiments, the supply port is provided on one side of the case portion in the axial direction, and the discharge port is provided on the other side portion in the axial direction of the case portion. Is not limited to this. For example, the supply port may be provided at the central portion in the axial direction of the case portion, and the discharge port may be provided at each of one side portion and the other side portion in the axial direction of the case portion.

Further, in the first and second embodiments, the example in which the key member is provided at a circumferential position different from the circumferential position of the supply port and the discharge port is shown, but the present invention is not limited to this. For example, the key member may be provided at the same position as the circumferential position of the supply port or the discharge port.

Further, in the first and second embodiments, the example in which the stator core is housed in the case portion in a state where the stator core is gap-fitted with respect to the case portion is shown, but the present invention is not limited to this. For example, the stator core may be housed in the case portion by tightening or intermediate fitting with respect to the case portion.

Further, in the first and second embodiments, an example in which the case portion is composed of a single case member is shown, but the present invention is not limited to this. That is, the case portion may be composed of a plurality of members.

1 Rotor 2 Stator 3, 203 Case part 4, 204, 304, 404 Key member 4a part (diameter outer part) 5 Oil passage 21 Stator core 23 Core key groove 24 Outer surface (Outer surface of stator core)
31 Inner peripheral surface (inner peripheral surface of the case) 32, 232 Grooves (grooves for oil passages)
33 Supply port 34 Discharge port 35, 235 Case part Key groove part 41, 341 Notch part 51, 251 Oil passage (case part oil passage) 52, 252 Oil passage (key member oil passage)
100, 200, 300, 400 Rotating electric machine 241 and 441 Hole Lq oil (oil for cooling the stator core)

Claims (12)

With the rotor
A stator having a stator core arranged so as to face the radial outer side of the rotor,
A case portion for accommodating the rotor and the stator core,
It is provided with a key member which is arranged between the case portion and the stator core in the radial direction and which positions the stator core in the circumferential direction with respect to the case portion.
The case portion is formed along the circumferential direction, and is provided with a case portion oil passage through which oil for cooling the stator core flows.
The rotary electric machine is provided with a key member oil passage which is continuous with the case portion oil passage in the circumferential direction and in which oil for cooling the stator core is circulated in the circumferential direction. The case portion is provided with a case portion key groove portion in which a part of the key member is arranged, and at least a part of the inner peripheral surface of the case portion is arranged so as to support the outer peripheral surface of the stator core. And
The case portion oil passages are provided so as to be separated from each other in the circumferential direction by the case portion key groove portions, and are configured as a plurality of oil passage groove portions recessed radially outward with respect to the inner peripheral surface of the case portion.
The rotary electric machine according to claim 1, wherein the key member is provided with the key member oil passage so as to connect the plurality of oil passage groove portions separated from each other in the circumferential direction in the circumferential direction. On the outer peripheral surface of the stator core, a core key groove portion is provided which is formed so as to face the key groove portion of the case portion in the radial direction and in which the key member is arranged.
The key member is arranged so as to straddle the core key groove portion and the case portion key groove portion.
2. The key member oil passage is formed in a portion of the key member that is radially outer of the outer peripheral surface of the stator core so as to connect the plurality of oil passage grooves in the circumferential direction. The rotary electric machine described in. 2. The key member oil passage is formed as a notch for connecting the plurality of oil passage grooves in the circumferential direction or a hole for connecting the plurality of oil passage grooves in the circumferential direction. Or the rotary electric machine according to 3. The key member oil passage is composed of the notch portion.
The rotary electric machine according to claim 4, wherein the depth of the groove portion for the oil passage is larger than the depth of the notch portion. The rotary electric machine according to any one of claims 1 to 5, wherein the length of the key member oil passage is equal to or greater than the length of the case portion oil passage in the axial direction of the stator core. Claims 1 to 6 are configured such that the key member oil passage is continuous with the case portion oil passage in the circumferential direction so that the oil passage is formed so as to surround the entire circumference of the outer peripheral surface of the stator core. The rotary electric machine according to any one of the above items. When the key member oil passage is continuous with the case portion oil passage in the circumferential direction, it is continuous from the supply port for supplying the oil for cooling the stator core to the discharge port for discharging the oil for cooling the stator core. The rotary electric machine according to claim 7, wherein an oil passage having a spiral shape is formed. The key member is provided at a circumferential position different from the circumferential position of the supply port for supplying oil for cooling the stator core, and is provided in the circumferential direction of the discharge port for discharging the oil for cooling the stator core. The rotary electric machine according to any one of claims 1 to 8, which is provided at a position in the circumferential direction different from the position. The case portion is provided with a case portion key groove portion in which a part of the key member is arranged, and at least a part of the inner peripheral surface of the case portion is arranged so as to support the outer peripheral surface of the stator core. And
The rotary electric machine according to any one of claims 1 to 9, wherein the stator core is housed in the case portion in a state of being gap-fitted with respect to the case portion. The case portion is composed of a single case member in which the case portion oil passage is formed.
The rotary electric machine according to any one of claims 1 to 10, wherein the key member oil passage is provided in the key member arranged between the single case member and the stator core in the radial direction. .. A plurality of the key members are provided at equal angular intervals about the central axis when viewed in the direction of the central axis of the stator core.
The rotary electric machine according to any one of claims 1 to 11, wherein the key member oil passage is provided in each of the plurality of key members.

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