JP7331625B2 - Rotating electric machine - Google Patents

Description

The present invention relates to rotating electric machines.

2. Description of the Related Art Conventionally, a rotating electric machine having a stator is known (see Patent Document 1, for example).

The aforementioned Patent Document 1 discloses a rotating electric machine including a stator, a rotor, and a case. In this rotating electric machine, the stator core of the stator is fixed to the case by shrink fitting. A cooling groove is formed in the inner peripheral surface of the case along the circumferential direction and through which the coolant flows. Further, the stator core is provided with a positioning protrusion that protrudes radially outward from the outer peripheral surface and is used to position the stator core in the circumferential direction with respect to the case. Further, the case is formed with a positioning groove recessed radially outward at a position corresponding to the positioning protrusion. Between the positioning protrusion and the positioning groove, a cooling liquid flow path is formed through which the cooling liquid flows in the axial direction. In this rotary electric machine, the cooling liquid flowing in the circumferential direction in the cooling groove collides with the positioning protrusion, and the cooling liquid flows in the cooling liquid channel so as to bypass the positioning protrusion radially outward. Then, in the coolant flow path, the direction in which the coolant flows is changed from the circumferential direction to the axial direction.

JP 2009-22145 A

However, in the rotary electric machine described in Patent Document 1, the coolant flowing in the cooling groove in the circumferential direction collides with the positioning protrusion, and the cooling liquid flows in the coolant flow path so as to bypass the positioning protrusion radially outward. flow. For this reason, it is thought that the flow of the coolant is blocked by the amount that the coolant bypasses the positioning protrusion, and that the portion radially inward of the portion (positioning protrusion) where the coolant is bypassed is less likely to be cooled. be done. As a result, it is conceivable that cooling performance of the stator core by the cooling liquid is degraded due to the cooling liquid bypassing the positioning projections. Here, in order to position the stator core with respect to the case in the circumferential direction, it is conceivable to provide the rotary electric machine with a key member 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 rotating electric machine, it is necessary for the cooling liquid to bypass the key member. It is believed that the cooling performance for the stator core is degraded. Therefore, even when a 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 deteriorating due to the coolant (oil for cooling). An electric machine is desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and one object of the present invention is to provide a stator core with oil even when a key member is provided radially between the stator core and the case portion. To provide a rotating electric machine capable of preventing deterioration of cooling performance for a motor.

In order to achieve the above object, a rotating electric machine according to one aspect of the present invention includes a rotor, a stator having a stator core arranged facing the radially outer side of the rotor, a case portion accommodating the rotor and the stator core, a key member disposed between the case portion and the stator core in the radial direction and for positioning the stator core in the circumferential direction with respect to the case portion; A case portion oil passage for circulating cooling oil is provided, and the key member is circumferentially continuous with the case portion oil passage and circumferentially circulates oil for cooling the stator core. An oil passage is provided, and 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 portion of the inner peripheral surface of the case portion supports the outer peripheral surface of the stator core. The case portion oil passages are provided circumferentially apart from each other by the case portion key groove portion, 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. A key member oil passage is provided in the key member so as to circumferentially connect a plurality of oil passage grooves that are circumferentially spaced apart from each other.

In the rotary electric machine according to one aspect of the present invention, as described above, the key member oil passage is circumferentially continuous with the case portion oil passage and distributes the oil for cooling the stator core in the circumferential direction in the key member. establish. As a result, even when the key member is provided in the rotary electric machine, the key member oil passage circumferentially continuous with the case portion oil passage for circulating the oil in the circumferential direction allows the oil to circulate in the circumferential direction (the oil circulates through the key member). pass in the circumferential direction). As a result, even when the key member is provided, it is not necessary to divert the oil around the key member. A radially inner portion (stator core) of the key member can be cooled. As a result, even when the key member is provided radially between the stator core and the case portion, it is possible to prevent the cooling performance of the stator core from deteriorating due to the oil for cooling the stator core. Further, the oil for cooling the stator core can be brought into contact with the outer peripheral surface of the stator core and directly cooled by the key member oil passage formed by the oil passage groove. As a result, the cooling performance can be improved as compared with the case of indirect cooling by interposing another member between the case part oil passage and the stator core. As described above, by providing the key member oil passages so as to connect the plurality of oil passage groove portions that are circumferentially separated from each other in the key member, the plurality of oil passage groove portions are connected to each other. Even when separated (divided), the key member oil passage can prevent the oil flow from being obstructed by the key member.

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 deteriorating due to the oil for cooling the stator core.

1 is a plan view showing the configuration of a rotating electrical machine according to a first embodiment; FIG. FIG. 4 is a radial cross-sectional view showing configurations of a case portion and a key member according to the first embodiment; It is a mimetic diagram for explaining the composition of the oilway by a 1st embodiment. FIG. 4 is a cross-sectional view showing the configuration of the notch portion of the key member according to the first embodiment; It is a top view which shows the structure of the oil path by 1st Embodiment. It is a top view which shows the structure of the rotary electric machine by 2nd Embodiment. FIG. 7 is a cross-sectional view showing the configuration of a key member according to a second embodiment; FIG. 5 is a diagram showing the configuration of a rotating electric machine (key member) according to a first modification of the first and second embodiments; FIG. 10 is a diagram showing a configuration of a rotating electric machine (key member) according to a second modification of the first and second embodiments;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

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

In the specification of the present application, "axial direction" means a direction along the rotation axis (center axis C1) of the rotor 1 (stator 2), and means the Z direction in the drawing. "Radial direction" means the radial direction of the rotor 1, "radial direction inner side" means the R1 direction in the drawing, and "radial direction outer side" means the R2 direction in the drawing. Also, the “circumferential direction” means the circumferential direction of the rotor 1 (the E1 direction or the E2 direction).

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

(Stator configuration)
Stator 2 includes a stator core 21 and coils 22 arranged on stator core 21 . Stator core 21 is formed, for example, by laminating a plurality of electromagnetic steel sheets (silicon steel sheets) in the axial direction, and is configured to allow passage of magnetic flux. Stator core 21 also includes a back yoke 21a, a plurality of teeth 21b protruding radially inward from back yoke 21a, and slots 21c formed between teeth 21b adjacent 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 radially inward with respect to the outer peripheral surface 24 of the stator core 21 . Core key groove portion 23 is formed from end surface 21d on one side in the axial direction of stator core 21 to end surface 21e on the other side in the axial direction. Further, as shown in FIG. 3, the recess depth of the core keyway portion 23 with respect to the outer peripheral surface 24 is d1. As shown in FIG. 1, the core key groove portions 23 are provided at equal angular intervals at the same radial position about the center axis C1 when viewed in the axial direction.

The coil 22 is wound around a plurality of teeth 21b. The coil 22 is arranged in each slot portion 21c. The coil 22 is connected to an external power source and configured to be supplied with power (for example, three-phase AC power). The coil 22 is configured to generate a magnetic field when supplied with power. 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 .

(Structure of case)
As shown in FIG. 1 , case portion 3 is configured to accommodate rotor 1 and stator core 21 . Further, the case portion 3 is arranged so that at least a portion of the inner peripheral surface 31 of the case portion 3 supports the outer peripheral surface 24 of the stator core 21 . The stator core 21 is accommodated in the case portion 3 while being loosely fitted to the case portion 3 . That is, as shown in FIG. 3, a gap CL1 is provided between (at least 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 formed by 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 . Oil Lq is, for example, ATF (Automatic Transmission Fluid). A detailed description of the oil passage 51 will be given later. Also, the oil passage 51 is an example of a "case portion oil passage" in the scope of claims.

Specifically, the case portion 3 is formed with a plurality of groove portions 32 forming oil passages 51 that are recessed radially outward with respect to the inner peripheral surface 31 of the case portion 3 . A plurality of grooves 32 are formed along the inner peripheral surface 31 so as to extend in the circumferential direction. The plurality of grooves 32 are spaced apart from each other in the circumferential direction by a case key groove 35 which will be described later. That is, the plurality of grooves 32 are separated from each other in the circumferential direction. For example, as shown in FIG. 1, it is divided into three grooves 32 in the circumferential direction by three case key grooves 35 when viewed in the axial direction. For example, the groove portion 32 is formed by cutting the cast case portion 3 . Further, the groove depth (the depth to the bottom) in the radial direction with respect to the inner peripheral surface 31 of the groove portion 32 is d2. Groove portion 32 is formed, for example, in a rectangular shape. Note that 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 "oil passage groove portion" in the scope of 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 penetrating 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 penetrating the case portion 3 in the radial direction. For example, the supply port 33 is provided in a portion of the case portion 3 on one side in the axial direction, and the discharge port 34 is provided in a portion of the case portion 3 on the other side 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 radially inward with respect to the inner peripheral surface 31 of the case portion. Further, the recess depth of the case portion keyway portion 35 with respect to the inner peripheral surface 31 is d3. For example, the recess depth d3 of the case key groove portion 35 is greater than the groove depth d2 of the groove portion 32 . Further, the case portion key groove portion 35 is formed at a position facing the core key groove portion 23 in the radial direction.

(Structure of key member)
As shown in FIG. 2 , key member 4 is provided separately from case portion 3 and stator core 21 . The key member 4 is disposed between the case portion 3 and the stator core 21 in the radial direction, and has a function of circumferentially positioning (phasing) the stator core 21 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) an end face 21d on one side in the axial direction of the stator core 21 to (near) an end face 21e on the other side in the axial direction. In the first embodiment, the key member 4 is arranged so as to extend from a radially inner position of the outer peripheral surface 24 of the stator core 21 to a radially outer position of the outer peripheral surface 24 of the stator core 21 . 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 to straddle the case 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 that is circumferentially continuous with the oil passage 51 and that circulates the oil Lq in the circumferential direction. That is, the oil passage 52 has a function of allowing the oil Lq to pass through the key member 4 in the circumferential direction. The oil passage 52 is an example of a "key member oil passage" in the scope of claims.

Further, the key member 4 is provided at a circumferential position different from the circumferential position of the supply port 33 and 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.

(Configuration of oil passage)
As shown in FIGS. 4 and 5, the oil passages 52 and 51 are formed so as to be continuous in the circumferential direction. Further, the oil passage 52 is formed so as to circumferentially connect a plurality of groove portions 32 (oil passages 51 ) that are circumferentially separated from each other. 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 connecting the oil passage 52 of the key member 4 to the oil passage 51 of the case portion 3 in the circumferential direction. is configured so that an oil passage 5 is formed in the That is, the oil passage 5 is a flow passage for the oil Lq that surrounds the outer peripheral surface 24 and extends from the supply port 33 to the oil passages 51 and 52 and the discharge port 34 . In the first embodiment, the oil passage 5 is configured to have a continuous spiral shape from the supply port 33 to the discharge port 34 by connecting the oil passage 52 to the oil passage 51 in the circumferential direction. In other words, the oil passage 5 is formed in a unicursal shape from the supply port 33 to the discharge port 34 .

As shown in FIG. 3 , the oil passage 52 is formed in a portion 4 a of the key member 4 radially outside the outer peripheral surface 24 of the stator core 21 . That is, the oil passage 52 is provided in the portion 4 a of the key member 4 that is arranged in the case key groove portion 35 . Specifically, the key member 4 is formed with a plurality of cutouts 41 forming the oil passages 52 . The oil passage 52 is configured by the notch portion 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 greater than the depth d4 of the notch portion 41 . In addition, in the axial direction of the stator core 21, the length L2 of the oil passage 52 is equal to or longer than the length L1 of the oil passage 51 (see FIG. 4). For example, length L2 and length L1 are of equal magnitude.

[Second embodiment]
Next, the configuration of a rotating electric machine 200 according to the second embodiment will be described with reference to FIGS. 6 and 7. FIG. In the second embodiment, oil passages 252 are formed by hole portions 241, unlike the first embodiment in which oil passages 52 are formed by notch portions 41. As shown in FIG. The same reference numerals (step numbers) are given to the same structures and steps as in the first embodiment, and the description thereof is omitted.

A rotating electric machine 200 according to the second embodiment includes a case portion 203 and a key member 204, as shown in FIG. The case portion 203 is provided with a groove portion 232 for circulating the 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 . An oil passage 251 is configured by the groove portion 232 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 across 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 forming the oil passages 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 passages 251 and 252 . As shown in FIG. 7, the hole 241 is, for example, circular. Other configurations of the second embodiment are the same as those of the first embodiment.

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

In the first and second embodiments, as described above, the oil passages (51, 251) are circumferentially continuous with the case portion oil passages (51, 251), and the oil (Lq) for cooling the stator core (21) is circulated in the circumferential direction. A key member oil passage (52, 252) is provided in the key member (4, 204). As a result, even when the key member (4, 204) is provided in the rotary electric machine (100, 200), the key member (4, 204) is connected in the circumferential direction to the case part oil passage (51, 251) for circulating the oil (Lq) 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 members (4, 204) in the circumferential direction). As a result, even when the key member (4, 204) is provided, the oil (Lq) does not need to bypass the key member (4, 204), thereby preventing the flow of the oil (Lq) from being obstructed. In addition, the radially inner portion of the key member (4, 204) can be cooled by the oil (Lq) flowing through the key member oil passage (52, 252). 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 (21) is cooled by the oil (Lq). 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 part of the inner peripheral surface (31) of the case portion (3, 203) is arranged to support the outer peripheral surface (24) of the stator core (21), and the case portion oil passage (51 , 251) are provided circumferentially apart from each other by the case portion key groove portions (35, 235), and are recessed radially outward with respect to the inner peripheral surface (31) of the case portion (3, 203). A plurality of oil passage grooves (32, 232) circumferentially spaced apart from each other 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) through the key member oil passages (52, 252) formed by the oil passage grooves (32, 232). It can be cooled directly by contacting the outer peripheral surface (24). As a result, the cooling performance can be improved as compared with the case of indirect cooling via another member between the case oil passages (51, 251) and the stator core (21). Then, as in the first and second embodiments, the key member (4, 204) is connected to the plurality of oil passage grooves (32, 232) circumferentially spaced apart from each other in the circumferential direction. By providing the key member oil passages (52, 252), the oil (Lq ) can be prevented by the key member oil passages (52, 252).

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

In addition, in the first and second embodiments, as described above, the key member oil passages (52, 252) are notches (41) connecting the plurality of oil passage grooves (32) in the circumferential direction, or , a hole (241) connecting the plurality of oil passage grooves (32) in the circumferential direction. With this configuration, the key member oil passages (52, 252) can be easily formed by forming the notch (41) or the hole (241) in the key member (4, 204). can.

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

In addition, 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 ) is greater than or equal to the length (L1). With this structure, the fluidity in the key member oil passages (52, 252) can be improved by the amount of the axial length (L2). 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).

In addition, in the first and second embodiments, as described above, the key member oil passages (52, 252) are connected to the case portion oil passages (51, 251) in the circumferential direction, so that the outer circumference of the stator core (21) is 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) can be uniformly cooled over the entire circumference. can be done.

In addition, in the first and second embodiments, as described above, the key member oil passages (52, 252) are circumferentially connected to the case portion oil passages (51, 251), thereby cooling the stator core (21). An oil passage (5) having a continuous spiral shape from a supply port (33) for supplying oil (Lq) for cooling the stator core (21) to a discharge port (34) for discharging oil (Lq) for cooling the stator core (21) configured to be formed. With this configuration, the oil (Lq) is supplied from the supply port (33) and discharged from the discharge port (34) by the oil passage (5) having a spiral shape. ) flows 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 allowed to flow around the stator core (21) for only one turn. As a result, the cooling performance of the stator core (21) by the oil (Lq) can be improved. In addition, the number of supply ports (33) and discharge ports (34) can be reduced unlike the case where a supply port and a discharge port are provided for each of the plurality of oil passages that flow only once around the stator core (21). 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 member (4, 204) is positioned at the circumferential position of the supply port (33) for supplying the oil (Lq) for cooling the stator core (21). , and is provided at a circumferential position different from the circumferential position of a 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 connected to the key member oil passage (52, 252). ) or the discharge port (34), 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 the case portion key groove portion (35, 235) in which a part of the key member (4, 204) is arranged. At least part of the inner peripheral surface (31) of the case portion (3, 203) is arranged to support the outer peripheral surface (24) of the stator core (21), and the stator core (21) is: It is accommodated in the case portion (3, 203) while being loosely fitted to the case portion (3, 203). With this configuration, the stator core (21) can be easily housed in the case (3, 203) compared to the case where the stator core (21) is tightly fitted to the case (3, 203). can be done. Then, the oil (Lq) from the case portion oil passages (51, 251) seeps 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 passages (51, 251) and the key member oil passages (52, 252), the radial direction between 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) even in the gap (CL1).

In addition, 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 passages (51, 251) are formed, and the key member oil passages are formed. (52,252) is provided on a key member (4,204) located radially between the single case member and the stator core (21). With this configuration, unlike the case where the case portion (3, 203) is composed of a plurality of members, it is possible to prevent an increase in the number of parts of the rotating electric machine (100, 200) and a complication of the structure. .

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

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

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

(Second modification)
Moreover, although the example which forms a hole part circularly was shown in the said 2nd Embodiment, this invention is not limited to this. For example, in key member 404 of rotating electrical machine 400 according to the second modification shown in FIG. 9, hole 441 is formed in a rectangular shape.

(Other modifications)
In addition, in the first and second embodiments, an example was shown in which the oil passage of the case portion was formed on the inner peripheral surface of the case portion so as to be in contact with the outer peripheral surface of the stator core. It is 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 above-described 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 above-described first and second embodiments, an example in which the case portion is formed by casting and the groove portion is formed by cutting has been shown, but the present invention is not limited to this. That is, the case portion may be formed by a method (cutting or forging) other than casting. Also, the groove may be formed by a method other than cutting (such as forming when the case is cast).

Further, in the above-described first and second embodiments, an example in which ATF is used as the oil for cooling the stator core has been described, 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 the ATF (for example, oil dedicated to cooling the stay core).

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

Also, in the above-described 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 above-described first and second embodiments, an example is shown in which the depth of the groove of the case is greater than the depth of the notch, 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.

In the first and second embodiments, the length of the oil passage of the key member in the axial direction of the stator core is set to be longer than the length of the oil passage of the case portion. is not limited to That is, in the axial direction of the stator core, the length of the oil passage of the key member may be less than the length of the oil passage of the case portion.

In the first and second embodiments, the oil passage of the key member is connected to the oil passage of the case portion 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. Although shown, the invention is not so limited. That is, it may be provided at a position corresponding to only a part of the outer peripheral surface of the stator core by the oil passage of the key member and the oil passage of the case portion.

In addition, in the first and second embodiments, the oil passage of the key member is connected to the oil passage of the case portion in the circumferential direction, thereby forming 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 a spiral shape.

In addition, in the above-described first and second embodiments, an example in which 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 of the case portion in the axial direction has been described. is not limited to this. For example, the supply port may be provided in the axially central portion of the case portion, and the discharge port may be provided in each of the axially one side portion and the other side portion of the case portion.

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

Further, in the above-described first and second embodiments, an example in which the stator core is accommodated in the case portion while being loosely fitted to the case portion has been described, but the present invention is not limited to this. For example, the stator core may be housed within the case portion with an interference fit or an intermediate fit with respect to the case portion.

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

Reference Signs List 1 rotor 2 stator 3, 203 case portion 4, 204, 304, 404 key member 4a portion (radial outer portion) 5 oil passage 21 stator core 23 core key groove portion 24 outer peripheral surface (outer peripheral surface of the stator core)
31 inner peripheral surface (inner peripheral surface of case portion) 32, 232 groove portion (oil passage groove portion)
33 supply port 34 discharge port 35, 235 case portion key groove portion 41, 341 notch portion 51, 251 oil passage (case portion oil passage) 52, 252 oil passage (key member oil passage)
100, 200, 300, 400 rotating electric machine 241, 441 hole Lq oil (oil for cooling the stator core)

Claims (11)

a rotor;
a stator having a stator core arranged facing the radially outer side of the rotor;
a case portion that houses the rotor and the stator core;
a key member disposed between the case portion and the stator core in the radial direction and for positioning the stator core in the circumferential direction with respect to the case portion;
The case portion is provided with a case portion oil passage that is formed along the circumferential direction and circulates oil for cooling the stator core,
The key member is provided with a key member oil passage circumferentially continuous with the case portion oil passage and for circumferentially circulating oil for cooling the stator core,
The case portion is provided with a case portion key groove portion in which a portion of the key member is arranged, and at least a portion of the inner peripheral surface of the case portion is arranged to support the outer peripheral surface of the stator core. and
The case portion oil passages are provided circumferentially apart from each other by the case portion key groove portion, 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 rotating electrical machine, wherein the key member is provided with the key member oil passage so as to circumferentially connect the plurality of oil passage groove portions that are circumferentially spaced apart from each other. A core key groove portion is formed on the outer peripheral surface of the stator core so as to face the case portion key groove portion in a radial direction, and in which the key member is arranged,
The key member is arranged 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 radially outside an 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 connecting the plurality of oil passage grooves in the circumferential direction or as a hole connecting the plurality of oil passage grooves in the circumferential direction . 3. Or the rotary electric machine according to 2 . The key member oil passage is configured by the notch portion,
The rotary electric machine according to claim 3 , wherein the depth of said oil passage groove is greater than the depth of said notch. The electric rotating machine according to any one of claims 1 to 4, wherein the length of the key member oil passage in the axial direction of the stator core is equal to or greater than the length of the case portion oil passage. 6. An oil passage is formed so as to surround the entire circumference of the outer peripheral surface of the stator core by connecting the key member oil passage to the case portion oil passage in the circumferential direction. The rotary electric machine according to any one of . When the key member oil passage continues in the circumferential direction to the case portion oil passage, it continues from the supply port for supplying oil for cooling the stator core to the discharge port for discharging the oil for cooling the stator core. 7. The rotating electric machine according to claim 6 , wherein the oil passage is formed in a spiral shape. The key member is provided at a circumferential position different from a circumferential position of a supply port for supplying oil for cooling the stator core, and is provided at a circumferential direction of a discharge port for discharging oil for cooling the stator core. The rotary electric machine according to any one of claims 1 to 7 , provided at a position in the circumferential direction different from the position. The rotating electric machine according to any one of claims 1 to 8 , wherein the stator core is accommodated in the case portion while being loosely fitted to the case portion. The case portion is made of a single case member in which the case portion oil passage is formed,
The electric rotating machine according to any one of claims 1 to 9 , wherein the key member oil passage is provided in the key member disposed 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 around the central axis when viewed in the central axis direction of the stator core,
The electric rotating machine according to any one of claims 1 to 10 , wherein each of said plurality of key members is provided with said key member oil passage.

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