JP6938767B2 - Rotating machine for internal combustion engine and its rotor - Google Patents

Description

Cross-reference of related applications

This application is based on Patent Application No. 2018-59817 filed in Japan on March 27, 2018, and the content of the basic application is incorporated by reference in its entirety.

The disclosure in this specification relates to a rotary electric machine for an internal combustion engine and a rotor thereof.

Patent Document 1 and Patent Document 2 disclose a rotary electric machine for an internal combustion engine and a rotor thereof. The rotary electric machine for an internal combustion engine is equipped with a fan. The contents of the prior art documents listed as prior art are incorporated by reference as an explanation of the technical elements in this specification.

JP-A-59-35547 Japanese Unexamined Patent Publication No. 2001-45714

In the configuration of Patent Document 1, the fan component is provided inside the rotary electric machine. The fan creates a flow inside the rotating machine, especially the rotor. On the other hand, Patent Document 2 introduces a flow from outside the rotor. Rotating electric machines for internal combustion engines are required to efficiently generate a flow. In the above-mentioned viewpoint or in other viewpoints not mentioned, further improvement is required for the rotary electric machine for internal combustion engine and its rotor.

One object disclosed is to provide a rotary electric machine for an internal combustion engine and a rotor that efficiently generate a flow by components arranged inside the rotor.

The rotor of a rotary electric machine for an internal combustion engine disclosed herein has a cylindrical outer cylinder (22b) and a bottom plate (22c) extending at one end of the outer cylinder, and has a rotor core having a through hole (22e) penetrating the bottom plate. and (22), disposed on the bottom plate inside the outer cylinder, and a front side or rear side the positioned blade of the through hole (28,228,328) with respect to the rotational direction of the rotor core (R21), The blade has a straight portion (28a) and a curved portion (28b), the straight portion is arranged so as to occupy the radial inside of the curved portion, and the curved portion is radially outside of the straight portion. It is arranged so as to occupy, and, in the radially outward, that provides a cavity of triangular.

The rotor of a rotary electric machine for an internal combustion engine disclosed creates a flow through a through hole by a blade. When the blade is positioned on the front side of the through hole, a negative pressure is generated on the rear side of the blade, and an inward flow through the through hole is generated. When the blade is positioned on the rear side of the through hole, a positive pressure is generated on the front side of the blade and an outward flow through the through hole is generated. The rotor can utilize inward or outward flow. As a result, a rotor for a rotating electric machine for an internal combustion engine is provided, in which a flow is efficiently generated by blades arranged inside the rotor.

The rotary electric machine for an internal combustion engine disclosed here includes the rotor (21) and a stator (31) facing the rotor.

The disclosed aspects herein employ different technical means to achieve their respective objectives. The claims and the reference numerals in parentheses described in this section exemplify the correspondence with the parts of the embodiments described later, and are not intended to limit the technical scope. The objectives, features, and effects disclosed herein will be made clearer by reference to the subsequent detailed description and accompanying drawings.

It is sectional drawing of the rotary electric machine which concerns on 1st Embodiment. It is a top view in the rotor. It is a partial cross-sectional view of a rotor. It is a partial cross-sectional view of the rotor of the 2nd Embodiment. It is a top view in the rotor of the 3rd Embodiment. It is a partial cross-sectional view of a rotor.

A plurality of embodiments will be described with reference to the drawings. In a plurality of embodiments, functionally and / or structurally corresponding parts and / or related parts may be designated with the same reference code or reference codes having a hundreds or more different digits. References can be made to the description of other embodiments for the corresponding and / or associated parts.

1st Embodiment FIG. 1 shows a schematic structure of a rotary electric machine for an internal combustion engine. The internal combustion engine system 10 includes an internal combustion engine (engine 12) and a rotary electric machine for an internal combustion engine (hereinafter, simply referred to as a rotary electric machine 15). An example of an application of the rotary electric machine 15 is a generator driven by an engine 12. In this case, the rotary electric machine 15 supplies electric power to a plurality of electric loads including a battery. The rotary electric machine 15 may be used as a generator motor. In this case, the rotary electric machine 15 functions as both a generator and an electric machine. In this case, the rotary electric machine 15 functions as, for example, a starter motor for starting the engine 12.

The engine 12 has a body 13. The body 13 is provided by the crankcase or cover of the engine 12. The body 13 partitions a storage chamber 13a for accommodating the rotary electric machine 15. The containment chamber 13a is a dry cavity filled with air, or a wet cavity in which air and lubricating oil or air and a coolant are mixed. The rotary electric machine 15 dissipates heat to the fluid in the accommodation chamber 13a. The fluid includes air, lubricating oil, and / or coolant. The engine 12 has a rotating shaft 14. The rotating shaft 14 is provided by a crankshaft or a shaft interlocking with the crankshaft. The rotating shaft 14 is connected to the rotating electric machine 15.

The rotary electric machine 15 is mounted on the engine 12 and interlocks with the engine 12. The engine 12 is a vehicle engine mounted on a vehicle or a general-purpose engine. Here, the term vehicle should be interpreted broadly and includes moving objects such as vehicles, ships and aircraft, and fixed objects such as amusement equipment and simulation equipment. Also, utility engines can be used, for example, as generators and pumps. In this embodiment, the engine 12 is mounted on a saddle-riding vehicle.

The rotary electric machine 15 is assembled to the body 13 and the rotary shaft 14. The rotary electric machine 15 is an outer rotor type rotary electric machine. The rotary electric machine 15 has a rotor 21 and a stator 31. In the following description, the term axial term refers to the direction along the central axis AX when the rotor 21, stator 31, or stator core 32 is regarded as a cylinder. The radial term refers to the radial direction when the rotor 21, the stator 31, or the stator core 32 is regarded as a cylinder.

The rotor 21 is a field magnet. The rotor 21 has a cup shape as a whole. The rotor 21 is fixed to the end of the rotating shaft 14. The rotor 21 rotates together with the rotating shaft 14. The rotor 21 has a cup-shaped rotor core 22. The rotor 21 has a permanent magnet 23 arranged on the inner surface of the rotor core 22. The rotor 21 provides a rotating magnetic field by means of a permanent magnet 23. The permanent magnet 23 is provided by a plurality of arcuate magnets. The rotor 21 has a holder 24 for fixing the permanent magnet 23. The permanent magnet 23 may be fixed by an adhesive.

The rotor core 22 is connected to the rotating shaft 14. The rotating shaft 14 has an outer surface 14a for receiving the rotor core 22. The outer surface 14a is a tapered surface. The rotor core 22 and the rotating shaft 14 are connected via a positioning mechanism in the rotating direction such as key fitting. The rotor core 22 is fastened and fixed to the rotating shaft 14 by a nut 14b which is a fixing member. The rotor core 22 provides a yoke for a permanent magnet, which will be described later. The rotor core 22 is made of magnetic metal.

The rotor core 22 has an inner cylinder 22a, an outer cylinder 22b, and a bottom plate 22c. The inner cylinder 22a is connected to the rotating shaft 14. The inner cylinder 22a provides a boss portion. The outer cylinder 22b has a tubular shape. The outer cylinder 22b is located on the outer side in the radial direction of the inner cylinder 22a, away from the inner cylinder 22a. The outer cylinder 22b supports the permanent magnet 23 on the inner surface. The bottom plate 22c is annular. The bottom plate 22c extends to one end of the outer cylinder. The bottom plate 22c extends between the inner cylinder 22a and the outer cylinder 22b.

The inner cylinder 22a has a through hole for receiving the rotating shaft 14. The inner cylinder 22a has an inner surface 22d. The inner surface 22d is a tapered surface that comes into contact with the outer surface 14a. In this embodiment, the inner cylinder 22a, the outer cylinder 22b, and the bottom plate 22c are integrally formed of continuous materials. The inner cylinder 22a, the outer cylinder 22b, and the bottom plate 22c may be provided by a plurality of members. For example, the boss portion that provides the inner cylinder 22a may be provided by a separate member and connected by a connecting member such as a rivet.

The bottom plate 22c has a through hole 22e. The through hole 22e communicates the inside and outside of the cup-shaped rotor 21. The through hole 22e is located radially outside the annular range provided by the bottom plate 22c. The through hole 22e opens inside the rotor 21 at one end. The through hole 22e opens only at the axial end surface of the bottom plate 22c at the other end.

The holder 24 is a cup-shaped member. The holder 24 extends from the end surface of the permanent magnet 23 to the inner surface of the permanent magnet 23 and the inner surface of the bottom plate 22c. The holder 24 is fixed to the bottom plate 22c by a fixing member such as a rivet. The holder 24 fixes the permanent magnet 23 to the rotor core 22. The holder 24 provides a radial inner surface 24a. The radial inner surface 24a is also the inner surface of the rotor 21. The holder 24 is made of a thin non-magnetic metal.

The holder 24 is formed so as not to cover the through hole 22e. The holder 24 may have a through hole corresponding to the through hole 22e. As a result, the through hole 22e is recognized not only as a hole in the rotor core 22 but also as a hole in the rotor 21. The through hole 22e communicates with the inside and outside of the rotor 21.

The stator 31 is an armature. The stator 31 is an annular member. The stator 31 is an outer projecting pole type stator. The stator 31 is fixed to the body 13. The stator 31 has a through hole capable of receiving the rotating shaft 14 and the inner cylinder 22a. The stator 31 has an outer peripheral surface facing the inner surface of the rotor 21 via a gap.

The stator 31 has a stator core 32. The stator core 32 is arranged inside the rotor 21. The stator core 32 is fixed to the body 13. The shape of the stator core 32 is characterized by an annular portion provided on the inner side in the radial direction and a plurality of teeth (slip poles) provided on the outer side in the radial direction.

The stator 31 has a stator coil 33 mounted on the stator core 32. The stator coil 33 is mounted on a part of the stator core 32. The stator coil 33 is wound around the stator core 32. The stator coil 33 provides single-phase winding or multi-phase winding. The stator coil 33 is arranged on the teeth on the outer side in the radial direction of the stator core 32. The stator coil 33 provides an armature winding. The stator core 32 is fixed to the body 13 by bolts 35 which are fixing members. The bolt 35 penetrates the stator core 32. The bolt 35 fixes the stator core 32 to the cover of the body 13. The bolt 35 can be regarded as a part of the rotary electric machine 15 or a part of the engine 12.

FIG. 2 is a plan view of the rotor 21 in the direction of arrow II of FIG. The arrow R21 is the rotation direction R21 of the rotor 21. In the following description, the front side of the object with respect to the rotation direction R21 may be referred to as a forward direction, and the rear side of the object with respect to the rotation direction R21 may be referred to as a backward direction. The positions of the plurality of through holes 22e in the rotor 21 are drawn relatively accurately.

The rotor 21 has a plurality of through holes 22e. The plurality of through holes 22e are arranged at equal intervals with each other. The plurality of through holes 22e are dispersedly arranged apart from each other on the axial inner surface of the rotor 21. The axial inner surface of the rotor 21 extends between the two through holes 22e adjacent to each other in the circumferential direction. The through hole 22e is located radially outward on the axial inner surface of the rotor 21. The through hole 22e is close to the radial inner surface 24a of the rotor 21. The through hole 22e is clearly separated from the inner cylinder 22a. An axial inner surface of the rotor 21 extends between the inner cylinder 22a and the through hole 22e. There is a limited axial inner surface between the radial inner surface 24a and the through hole 22e. The edge of the through hole 22e may be in contact with the inner surface 24a in the radial direction. The through hole 22e is a circular hole.

Returning to FIG. 1, the rotary electric machine 15 has a fan 25. The fan 25 has an inner ring 26, an outer ring 27, and a blade 28 extending between the inner ring 26 and the outer ring 27. The inner ring 26 is fixed by a flange 22f formed on the inner cylinder 22a. The fan 25 can be fixed to the rotor 21 by various fixing mechanisms such as caulking, bonding, and press-fitting with the flange 22f. The fan 25 extends from the inner cylinder 22a along the axial inner surface of the rotor 21. The fan 25 reaches the radial outer edge of the axial inner surface of the rotor 21 via the axial inner surface of the rotor 21. The fan 25 is a part of the rotor 21. The fan 25 is made of resin. The fan 25 may be made of a metal such as aluminum.

In FIG. 2, the fan 25 has a plurality of blades 28. The plurality of blades 28 are arranged at equal intervals from each other. The plurality of blades 28 are dispersedly arranged apart from each other on the axial inner surface of the rotor 21.

One blade 28 extends radially outward from the inner ring 26. The blade 28 extends from the inner ring 26 in parallel with the tangential direction of the inner ring 26. The blade 28 has a straight portion 28a and a curved portion 28b. The straight portion 28a occupies a radial inner portion with respect to the curved portion 28b. The curved portion 28b occupies a radial outer portion than the straight portion 28a. The curved portion 28b is curved so as to be involved in the receding direction. The blade 28 reaches the outer ring 27 after passing through the straight portion 28a and the curved portion 28b.

The blade 28 has a receding angle RDn. The receding angle RDn is an inclination angle of the blade 28 with respect to the radial direction. The blade 28 is inclined with respect to the radial direction so as to gradually recede toward the rear side of the rotation direction R21 from the inner side in the radial direction to the outer side in the radial direction. The blade shaft BLn is assumed as the center of one blade 28. Here, the center of the linear portion 28a of the blade 28 is defined as the blade axis BLn. Further, it is assumed that the radial axis Rn passes through the intersection of the inner ring 26 and one blade 28. In this case, the receding angle RDn of the blade 28 is indicated by an arrow. The curved portion 28b is bent toward the rear of the blade 28 with respect to the rotation direction R21. In other words, the center defining the curved portion 28b is located behind the blade 28 with respect to the rotation direction R21. The blade 28 extends from the inner ring 26 toward the outer ring 27 with a receding angle RDn. The receding angle RDn may be defined by the entire straight portion 28a and the curved portion 28b. Again, the blade 28 has a receding angle.

The blade 28 has a leading edge on the front side in the rotation direction R21 and a trailing edge on the rear side in the rotation direction R21. The leading edge extends between an inner end point L1 on the inner side in the radial direction and an outer end point L3 on the outer side in the radial direction. The leading edge is curved so as to be convex toward the front in the rotation direction R21. The leading edge has a boundary point L2 between the straight portion 28a and the curved portion 28b. The trailing edge extends between an inner end point T1 on the inner side in the radial direction and an outer end point T3 on the outer side in the radial direction. The trailing edge is curved so as to be concave toward the front in the rotation direction R21. The trailing edge has a boundary point T2 between the straight portion 28a and the curved portion 28b.

The blade 28 is arranged in the rotor 21. The blade 28 is arranged on the bottom plate 22c inside the outer cylinder 22b. The plurality of blades 28 are in contact with a surface inside the rotor 21, for example, a surface of the bottom plate 22c. The blade 28 is arranged on the surface of the bottom plate 22c facing the stator 31.

The plurality of blades 28 are arranged radially at equal intervals. The plurality of blades 28 are arranged at the same angular intervals as the plurality of through holes 22e. The plurality of blades 28 are arranged in a spiral shape that gradually spreads from the inner cylinder 22a toward the outer cylinder 22b along the rotation direction of the rotor 21. All blades 28 have the same shape.

A cavity 22 g corresponding to the axial height of the blades 28 is partitioned between the two blades 28 adjacent to each other in the circumferential direction. The cavity 22g is fan-shaped. The cavity 22g gradually moves backward from the inner end in the radial direction to the outer end in the radial direction. Since the blade 28 has a receding angle RDn, it gradually generates a flow from the radial inner side to the radial outer side along the blade 28. The flow includes the flow of various fluids such as in the case of air, in the case of an air-fuel mixture containing oil, and in the case of liquid.

One blade 28 is arranged on the bottom plate 22c between the two through holes 22e. The blade 28 is located on the front side of one through hole 22e in the rotation direction R21. The blade 28 is located on a bottom plate 22c extending forward of one through hole 22e. The blade 28 is close to the through hole 22e located on the rear side of the two through holes 22e adjacent to each other in the rotation direction R21 apart from each other in the rotation direction R21.

The blades 28 are arranged obliquely with respect to the radial direction of the rotor 21. The blade 28 is close to the through hole 22e at the curved portion 28b. The receding angle RDn of the curved portion 28b is larger than that of the straight portion 28a. The blade 28 extends from the radial inside of one through hole 22e toward the radial outside. The blade 28 extends toward the front side of the other through hole 22e located on the rear side of the one through hole 22e in the rotation direction R21. The blade 28 extends so as to wrap around the through hole 22e at the curved portion 28b. The curved portion 28b extends so as to wrap around the arc portion on the radial outer side of the through hole 22e.

A part of the curved portion 28b overlaps the through hole 22e. A part of this protrudes from above the bottom plate 22c onto the through hole 22e in an eaves shape. The blade 28 may be partially placed above the through hole 22e. However, the blade 28 is not arranged so as to divide one through hole 22e into two. That is, the blade 28 is not stretched over the through hole 22e. Therefore, damage to the blade 28 is suppressed. All of the plurality of blades 28 are in the above positions with respect to the plurality of through holes 22e. A plurality of blades 28 are in the above positions with respect to all of the plurality of through holes 22e. Each of the plurality of blades 28 is positioned on the front side or the rear side of each of the plurality of through holes 22e.

The blade 28 may be in contact with the peripheral edge of the through hole 22e. Further, the blade 28 may block a part of the through hole 22e by straddling the peripheral edge portion of the through hole 22e. However, it is not appropriate for the blade 28 to block the entire through hole 22e or for the blade 28 to divide the through hole 22e into a plurality of regions.

FIG. 3 shows a schematic cross section taken along line III-III of FIG. Here, the bottom plate 22c and the fan 25 are shown. When the rotor 21 rotates in the rotation direction R21, the air outside the rotor 21 flows as an outer flow OTF, and the air inside the rotor 21 flows as an inner flow INF. The blade 28 creates an ascending LF that flows so as to avoid the blade 28. At this time, the pressure rises in the front LS of the blade 28 with respect to the rotation direction R21. A pressure drop occurs at the rear TS of the blade 28 with respect to the rotation direction R21.

The blade 28 creates an introverted IWF through the through hole 22e. Since the blade 28 is positioned immediately before the front side of the through hole 22e in the rotation direction R21, an inward flow IWF from the outside to the inside of the rotor 21 is generated in the rear side TS. In other words, the blade 28 is so close to the through hole 22e that it creates an inward flow IWF in the rear TS. That is, the blade 28 is close to the rear through hole 22e so that the negative pressure generated in the rear TS acts on the through hole 22e. This promotes the flow of fluid through the through hole 22e. The flow of fluid promotes heat dissipation of the rotor 21 and heat dissipation of the stator 31. Even if the blade 28 is in contact with the peripheral edge of the through hole 22e or the blade 28 blocks a part of the through hole 22e, heat dissipation of the rotor 21 and heat dissipation of the stator 31 are promoted.

The blade 28 is continuously formed from the inner cylinder 22a to the outer cylinder 22b. The blade 28 is also arranged inside the rotor 21 on the side surface facing the stator 31. It is desirable that the blades 28 are arranged in this way. As a result, an interaction with air, which will be described later, occurs.

Generally, it is known that the atmospheric temperature inside the rotor 21 is higher than the atmospheric temperature outside the rotor 21 due to the heat generated by the stator coil 33 and the heat generated by the rotor core 22 and / or the stator core 32. Therefore, efficiently flowing a low temperature fluid outside the rotor 21 into the rotor 21 improves the effect of heat dissipation. Since the through hole 22e is arranged near the stator coil 33, when a relatively low temperature inward flow IWF is introduced from the outside to the inside, a low temperature fluid is provided to the stator coil 33. Therefore, the above configuration further enhances the effect of heat dissipation. Further, the blade 28 which is continuous from the radial outer side to the radial inner side can supply a relatively low temperature fluid to the entire stator core 32 which is generating heat.

Further, the blade 28 gradually approaches the edge of the through hole 22e from the inner side in the radial direction to the outer side in the radial direction. Moreover, the blade 28 is curved so as to wrap around the through hole 22e at the curved portion 28b. Therefore, while generating a flow from the radial inner side to the radial outer side inside the rotor 21, a stronger inward flow IWF is generated at the outer portion of the through hole 22e on the radial outer side of the rotor 21.

According to the embodiment described above, the flow can be efficiently generated by a simple configuration in which the blade 28 is arranged inside the rotor 21. Provided is a rotor 21 of a rotary electric machine for an internal combustion engine, which efficiently generates a flow by a blade 28 arranged inside the rotor 21. Further, a rotary electric machine for an internal combustion engine including the rotor 21 is provided.

Second Embodiment This embodiment is a modification based on the preceding embodiment. In the above embodiment, the blade 28 is an upright plate parallel to the central axis AX. Alternatively, the blade may be an inclined plate inclined with respect to the central axis AX.

In FIG. 4, the blade 228 is tilted with respect to a plane parallel to the central axis AX. The inclination direction is a backward direction with respect to the rotation direction R21. That is, the blade 228 is inclined so as to move in the backward direction with respect to the rotation direction R21 as the distance from the bottom plate 22c increases. The blade 228 is provided by a ramp. The blade 228 produces introverted IWF with high efficiency.

Third Embodiment This embodiment is a modification based on the preceding embodiment. In the above embodiment, the blade 28 is arranged on the front side of the through hole 22e with respect to the rotation direction R21. Alternatively, the blade may be arranged rearward with respect to the rotation direction R21 of the through hole 22e.

In FIG. 5, the blade 328 is close to one through hole 22e located on the front side with respect to the rotation direction R21 among the two through holes 22e located apart from each other in the rotation direction R21. Moreover, the leading edge of the blade 328 is positioned so as to come into contact with the edge of the through hole 22e. The leading edge of the blade 328 is curved so as to be convex toward the front side with respect to the rotation direction R21. In this curvature, the leading edge of the blade 328 and the edge of the through hole 22e are in contact. The contact point between the curvature of the blade 328 and the edge of the through hole 22e is located relatively inward in the radial direction because the blade 328 has a receding angle RDn. In other words, most of the through hole 22e extends radially outward from the point of contact between the curvature of the blade 328 and the edge of the through hole 22e. Further, a part of the cavity 22g extends radially outward from the contact point between the curvature of the blade 328 and the edge of the through hole 22e. A portion of the cavity 22g provides a triangular cavity that gradually narrows outward in the radial direction towards the rear of the rotational direction R21. As a result, an increase in pressure occurs in a part of the cavity 22 g.

FIG. 6 shows a schematic cross section of the VI-VI line of FIG. The blade 328 creates an extrovert OWF through the through hole 22e. Since the blade 328 is positioned immediately after the through hole 22e in the rotation direction R21, an outward flow OWF from the inside to the outside of the rotor 21 is generated in the front LS. In other words, the blade 328 is so close to the through hole 22e that it creates an extrovert OWF in the front LS. That is, the blade 328 is close to the through hole 22e of the front LS from the blade 328 so that the positive pressure generated in the front LS acts on the through hole 22e. This promotes the flow of fluid through the through hole 22e. The flow of fluid promotes heat dissipation of the rotor 21 and heat dissipation of the stator 31. The plurality of blades 328 contribute to efficiently generate a flow inside the rotor 21.

The blade 28 may be in contact with the peripheral edge of the through hole 22e. Further, the blade 28 may block a part of the through hole 22e by straddling the peripheral edge portion of the through hole 22e. However, it is not appropriate for the blade 28 to block the entire through hole 22e or for the blade 28 to divide the through hole 22e into a plurality of regions.

In this embodiment, the high temperature fluid inside the rotor 21 is discharged to the outside of the rotor 21. A relatively low temperature fluid outside the rotor 21 is supplied from the open end of the rotor 21 along the axial direction from the outside of the stator 31 (left side of FIG. 1). The left side of FIG. 1 is the outside of the body 13 and is often the cover of the engine 12. Therefore, the left side of FIG. 1 is often exposed to the outside of the engine 12 and easily exchanges heat with the external environment. As a result, the fluid introduced from the left side of FIG. 1 is often cold. Therefore, in the above configuration, a relatively low temperature fluid can be easily introduced into the rotor 21.

In this embodiment, sometimes both an outward flow OWF and an inward flow IWF are generated in one through hole 22e. For example, an outward flow OWF is generated at the contact point between the blade 328 and the edge of the through hole 22e, and an inward flow IWF is generated at the outer end point L3. Further, the blade 328 may be inclined in the forward direction so as to cover the through hole 22e on the front side. In this case, a stronger extrovert OWF is generated. The contact point between the blade 328 and the edge of the through hole 22e may be formed by a straight portion 28a. The contact point between the blade 328 and the edge of the through hole 22e may be formed by a curved portion 28b.

Other Embodiments The disclosure in this specification, drawings and the like is not limited to the exemplified embodiments. The disclosure includes exemplary embodiments and modifications by those skilled in the art based on them. For example, disclosure is not limited to the parts and / or element combinations shown in the embodiments. Disclosure can be carried out in various combinations. The disclosure can have additional parts that can be added to the embodiment. Disclosures include those in which the parts and / or elements of the embodiment are omitted. Disclosures include the replacement or combination of parts and / or elements between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scopes disclosed are indicated by the claims description and should be understood to include all modifications within the meaning and scope equivalent to the claims statement.

The above embodiment includes a resin fan 25. Instead, the fan 25 may be made of metal. The fan 25 is preferably a non-magnetic material. The fan 25 made of a non-magnetic material prevents leakage of magnetic flux, and in addition, suppresses iron loss in the fan 25 due to leakage flux. Further, the fan 25 may be provided by the holder 24. For example, a raised portion corresponding to the blades 28, 228, and 328 may be formed on a part of the holder 24. Further, the holder 24 may be insert-molded into the resin fan 25.

In the above embodiment, the plurality of through holes 22e are arranged at equal angular intervals. Further, the plurality of through holes 22e are equidistant from the central axis AX. Alternatively, the plurality of through holes 22e may be arranged at unequal intervals. Further, the plurality of through holes 22e may be dispersed with respect to the distance from the central axis AX. For example, the plurality of through holes 22e may have different distances from the central axis AX.

In the above embodiment, the through hole 22e and the curved portion 28b are in contact with each other. Instead of this, the through hole 22e and the straight portion 28a may be in contact with each other. Further, the boundary between the straight portion 28a and the curved portion 28b may be in contact with the through hole 22e.

In the above embodiment, the plurality of blades 28, 228, 328 and the plurality of through holes 22e are associated with each other on a one-to-one basis. This configuration contributes to high efficiency. Instead of this, there may be a through hole 22e in which the blades 28, 228, and 328 are not arranged. Further, there may be blades 28, 228, 328 that are not arranged in the through hole 22e. Further, the through hole 22e can include a plurality of through holes having different diameters.

Claims (9)

A rotor core (22) having a cylindrical outer cylinder (22b) and a bottom plate (22c) extending at one end of the outer cylinder and having a through hole (22e) penetrating the bottom plate.
Is disposed on the bottom plate on the inside of the outer cylinder, and a front side or rear side the positioned blade (28,228,328) of said through hole with respect to the rotational direction of the rotor core (R21),
The blade has a straight portion (28a) and a curved portion (28b).
The straight portion is arranged so as to occupy the inside in the radial direction with respect to the curved portion.
The curved section is arranged so as to occupy the radially outer side than the straight portion, and, in the radially outward, the rotor for an internal combustion engine rotating electrical machine that provides a cavity of triangular. The rotor of a rotary electric machine for an internal combustion engine according to claim 1, wherein the blade is located on the front side of the through hole in the rotation direction. The rotor of a rotary electric machine for an internal combustion engine according to claim 1, wherein the blade is located on the rear side of the through hole in the rotation direction. The rotor of a rotary electric machine for an internal combustion engine according to any one of claims 1 to 3, wherein the blade is arranged obliquely with respect to the radial direction of the rotor. The rotor of a rotary electric machine for an internal combustion engine according to claim 4, wherein the blade extends with a receding angle (RDn) with respect to the rotation direction. The rotor of a rotary electric machine for an internal combustion engine according to any one of claims 1 to 5, wherein the curved portion is in contact with the edge of the through hole. It has a plurality of the through holes and a plurality of the blades.
The rotor of a rotary electric machine for an internal combustion engine according to any one of claims 1 to 6 , wherein each of the plurality of blades is located on the front side or the rear side of each of the plurality of through holes. The blade is provided as part of a fan (25) having an inner ring (26) and an outer ring (27), extends between the inner ring and the outer ring, and is made of resin, according to claim 1. The rotor of a rotary electric machine for an internal combustion engine according to any one of claims 7. The rotor (21) according to any one of claims 1 to 8.
A rotary electric machine for an internal combustion engine including a stator (31) facing the rotor.

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