CN111971879A - Rotating electric machine for internal combustion engine and rotor thereof - Google Patents

Abstract

The rotor (21) has a rotor core (22). The rotor core has a cylindrical outer cylinder (22b) and a bottom plate (22c) extending toward one end of the outer cylinder. The bottom plate has a through hole (22e) penetrating the bottom plate. The rotor has blades (28). The blade is disposed adjacent to the through hole. The blade applies negative or positive pressure to the through hole. The rotating electric machine utilizes the flow through the through-hole.

Description

Rotary electric machine for internal combustion engine and its rotor

CROSS-REFERENCE TO RELATED APPLICATIONS

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

technical field

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

Background technique

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 provided with a fan. The disclosures in the prior art documents listed as the background art are incorporated herein by reference as the description content of the technical elements in the present specification.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 59-35547

Patent Document 2: Japanese Patent Laid-Open No. 2001-45714

SUMMARY OF THE INVENTION

In the structure of Patent Document 1, the fan member is provided inside the rotating electrical machine. The fan generates a flow inside the rotating electrical machine, in particular the rotor. On the other hand, Patent Document 2 introduces the flow from the outside of the rotor. In a rotary electric machine for an internal combustion engine, it is required to generate flow efficiently. In the above-mentioned viewpoints or other viewpoints not mentioned, further improvement of the rotary electric machine for an internal combustion engine and its rotor is required.

An object of the present disclosure is to provide a rotary electric machine and a rotor for an internal combustion engine that efficiently generate flow by means of components arranged inside the rotor.

The rotor of the rotary electric machine for an internal combustion engine disclosed herein comprises: a rotor core (22) having a cylindrical outer cylinder (22b) and a bottom plate (22c) extending from one end of the outer cylinder, and provided with a passage penetrating the bottom plate A hole (22e); and vanes (28, 228, 328), which are arranged on the bottom plate inside the outer cylinder and are located on the front side or rear side of the through hole in the rotation direction (R21) of the rotor.

In the rotor of the rotary electric machine for an internal combustion engine of the present disclosure, the flow through the through holes is generated by the blades. When the vane is located on the front side of the through hole, negative pressure is generated on the rear side of the vane, and an inward flow through the through hole is generated. When the vane is located on the rear side of the through hole, positive pressure is generated on the front side of the vane, and an outward flow through the through hole is generated. The rotor can utilize inward flow or outward flow. As a result, there is provided a rotor of a rotary electric machine for an internal combustion engine, which efficiently generates a flow by the blades arranged inside the rotor.

The rotating electrical machine for an internal combustion engine disclosed herein includes the rotor (21) described above, and a stator (31) opposed to the rotor.

The various embodiments disclosed in this specification employ different technical means from each other to achieve their respective objectives. The reference numerals in parentheses described in the claims and their respective items are used to illustrate the correspondence with the parts related to the embodiments described later, and are not intended to limit the technical scope of the present invention. The objects, features, and effects to be disclosed in this specification will become more apparent by referring to the following detailed description and accompanying drawings.

Description of drawings

FIG. 1 is a cross-sectional view of a rotating electrical machine provided in a first embodiment.

Fig. 2 is a plan view of the inside of the rotor.

3 is a partial cross-sectional view of the rotor.

4 is a partial cross-sectional view of the rotor in the second embodiment.

FIG. 5 is a plan view of the inside of the rotor in the third embodiment.

6 is a partial cross-sectional view of the rotor.

Detailed ways

Hereinafter, a plurality of embodiments will be described with reference to the accompanying drawings. In the various embodiments, functionally and/or structurally corresponding parts and/or related parts are sometimes denoted by the same reference numerals, or only by different reference numerals in hundreds or more. For corresponding parts and/or associated parts, reference may be made to the relevant descriptions in other embodiments.

first embodiment

FIG. 1 shows a schematic configuration of a rotary electric machine for an internal combustion engine. The internal combustion engine system 10 includes an internal combustion engine (an engine 12 ) and a rotary electric machine for the internal combustion engine (hereinafter simply referred to as a rotary electric machine 15 ). An example of application of the rotating electrical machine 15 is a generator driven by the engine 12 . In this case, the rotating electrical machine 15 supplies power to a plurality of electrical loads including batteries. The use of the rotating electrical machine 15 may be a generator motor. In this case, the rotating electrical machine 15 may function as a generator or function as a motor. In this case, the rotary electric machine 15 can function, for example, as a starter motor for starting the engine 12 .

The engine 12 has a fuselage 13 . The fuselage 13 is provided by the crankcase or casing of the engine 12 . The main body 13 defines an accommodation chamber 13 a for accommodating the rotary electric machine 15 . The accommodating chamber 13a is a dry cavity filled with air, or a wet cavity in which air and lubricating oil, or air and cooling liquid are mixed. The rotating electrical machine 15 dissipates heat to the fluid in the storage chamber 13a. Here, the fluid includes air, lubricating oil and/or cooling liquid. 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 interlocked with the engine 12 by being attached to the engine 12 . The engine 12 is a vehicle engine or a general-purpose engine mounted on a vehicle. Here, the term vehicle should be construed broadly, including moving objects such as vehicles, ships, and aircraft, as well as stationary objects such as amusement equipment, simulation equipment, and the like. In addition, general purpose engines can be used, for example, as generators and pumps. In the present 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 rotating electrical machine 15 is an outer rotor type rotating electrical machine. The rotating electrical machine 15 has a rotor 21 and a stator 31 . In the following description, the term "axial direction" refers to the direction along the central axis AX when the rotor 21, the stator 31, or the stator core 32 is regarded as a cylinder. The term radial direction refers to the diameter direction when the rotor 21, the stator 31, or the stator core 32 is regarded as a cylinder.

The rotor 21 is a field element. 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 permanent magnets 23 arranged on the inner surface of the rotor core 22 . The rotor 21 provides a rotating magnetic field through permanent magnets 23 . The permanent magnets 23 are provided by a plurality of arc-shaped magnets. The rotor 21 has brackets 24 for fixing the permanent magnets 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 where the tip becomes smaller. The rotor core 22 is connected to the rotating shaft 14 by a positioning mechanism in the rotation direction such as keying. The rotor core 22 is fastened and fixed to the rotating shaft 14 by a nut 14b as a fixing member. The rotor core 22 provides a yoke for permanent magnets to be described later. The rotor core 22 is a magnetic metal product.

The rotor core 22 has an inner tube 22a, an outer tube 22b, and a bottom plate 22c. The inner cylinder 22a is connected to the rotating shaft 14 . The inner barrel 22a provides the hub. The outer cylinder 22b is cylindrical. The outer cylinder 22b is located radially outside the inner cylinder 22a, and is separated 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 is extended to one end of the outer cylinder. The bottom plate 22c extends between the inner tube 22a and the outer tube 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 in contact with the outer surface 14a. In the present embodiment, the inner tube 22a, the outer tube 22b, and the bottom plate 22c are integrally formed from a continuous material. The inner cylinder 22a, the outer cylinder 22b and the bottom plate 22c may also be provided by a plurality of members. For example, the hub portion for providing the inner cylinder 22a may be provided by another member, and may be 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 is open to the inside of the rotor 21 at one end. The through hole 22e is opened only on the axial end face of the bottom plate 22c at the other end.

The holder 24 is a cup-shaped member. The bracket 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 bracket 24 is fixed to the bottom plate 22c by fixing members such as rivets. The bracket 24 fixes the permanent magnet 23 to the rotor core 22 . The bracket 24 provides a radially inner surface 24a. The radially inner surface 24a is also the inner surface of the rotor 21 . The holder 24 is made of thin non-magnetic metal.

The bracket 24 is formed so as not to cover the through hole 22e. The bracket 24 sometimes has 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 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 salient pole type stator. The stator 31 is fixed to the body 13 . The stator 31 has a through hole that accepts the rotating shaft 14 and the inner cylinder 22a. The stator 31 has an outer peripheral surface opposed to the inner surface of the rotor 21 with a gap therebetween.

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 radially inner side and a plurality of teeth (salient poles) provided on the radially outer side.

The stator 31 has stator coils 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 a single-phase winding, or a multi-phase winding. The stator coil 33 is arranged on the teeth on the radially outer side of the stator core 32 . The stator coils 33 provide the armature windings. The stator core 32 is fixed to the body 13 by bolts 35 as fixing members. The bolts 35 penetrate the stator core 32 . Bolts 35 fix the stator core 32 to the cover of the fuselage 13 . The bolt 35 may be considered a component of the rotating electrical machine 15 , or a component of the engine 12 .

FIG. 2 is a plan view of the rotor 21 in the direction of arrow II in FIG. 1 . 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 the forward direction, and the rear side of the object with respect to the rotation direction R21 may be referred to as the backward direction. The positions and the like of the plurality of through holes 22e in the rotor 21 are drawn relatively correctly.

The rotor 21 is provided with a plurality of through holes 22e. The plurality of through holes 22e are arranged at equal intervals from each other. The plurality of through holes 22e are distributed and arranged on the inner surface of the rotor 21 in the axial direction so as to be separated from each other. The axial inner surface of the rotor 21 expands between the two through holes 22e adjacent to each other in the circumferential direction. The through hole 22e is located on the radially outer side on the axial inner surface of the rotor 21 . The through hole 22e is close to the radially inner surface 24a of the rotor 21 . The through hole 22e is clearly separated from the inner cylinder 22a. The axial inner surface of the rotor 21 expands between the inner cylinder 22a and the through hole 22e. Between the radially inner surface 24a and the through hole 22e, there is a limited axial inner surface. In addition, the edge of the through hole 22e may also be in contact with the radially inner surface 24a. 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 blades 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 riveting, bonding, and pressing of the flange 22f. The fan 25 extends along the axial inner surface of the rotor 21 from the inner cylinder 22a. The fan 25 reaches the radially outer edge of the axial inner surface of the rotor 21 via the axial inner surface of the rotor 21 . The fan 25 is part of the rotor 21 . The fan 25 is made of resin. The fan 25 may also be made of 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 vanes 28 are dispersed and arranged on the axial inner surface of the rotor 21 so as to be separated from each other.

A vane 28 extends radially outward from the inner ring 26 . The vanes 28 extend from the inner ring 26 parallel to 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 radially more inner portion than the curved portion 28b. The curved portion 28b occupies a radially more outer portion than the straight portion 28a. The curved portion 28b is curved so as to be rolled in the backward direction. The vanes 28 reach the outer ring 27 after passing through the straight portion 28a and the curved portion 28b.

The blades 28 have a sweep angle RDn. The sweep angle RDn is the inclination angle of the blade 28 with respect to the radial direction. The vanes 28 are inclined with respect to the radial direction so as to gradually retreat toward the rear side in the rotational direction R21 from the radially inner side toward the radially outer side. The center of one blade 28 is assumed to be the blade axis BLn. Here, the center of the linear portion 28a of the vane 28 is assumed to be the vane axis BLn. Further, it is assumed that the radial axis Rn passes through the intersection of the inner ring 26 with one of the vanes 28 . In this case, the sweep angle RDn of the blade 28 is indicated by the arrow. The curved portion 28b is bent more rearward than the blade 28 in the rotational direction R21. In other words, the center defining the curved portion 28b is located more rearward than the vane 28 in the rotational direction R21. The vanes 28 extend from the inner ring 26 towards the outer ring 27 with a sweep angle RDn. The sweep angle RDn may be defined by the entirety of the straight portion 28a and the curved portion 28b. In this case, the blades 28 also have a sweep angle.

The vane 28 has a leading edge which is a front side in the rotation direction R21 and a trailing edge which is a rear side in the rotation direction R21. The leading edge extends between a radially inner inner end L1 and a radially outer outer end L3. The leading edge is curved so as to bulge forward in the rotation direction R21. The leading edge has a boundary point L2 of the straight portion 28a and the curved portion 28b. The trailing edge extends between a radially inner inner end point T1 and a radially outer outer end point T3. The trailing edge is curved so as to be recessed forward in the rotation direction R21. The trailing edge has a boundary point T2 of the straight portion 28a and the curved portion 28b.

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

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

A cavity 22g corresponding to the axial height of the vanes 28 is defined between two vanes 28 adjacent to each other in the circumferential direction. The cavity 22g is sector-shaped. The cavity 22g gradually moves in the backward direction from the radially inner end toward the radially outer end. Since the vanes 28 have the sweep angle RDn, the flow from the radially inner side toward the radially outer side is gradually generated along the vanes 28 . The flow includes the flow of various fluids such as the flow of air, the flow of oil-containing mixture, and the flow of liquid.

One blade 28 is arranged on the bottom plate 22c between the two through holes 22e. The vane 28 is located on the front side in the rotation direction R21 of the one through hole 22e. The vane 28 is located on the bottom plate 22c that expands toward the front side of the one through-hole 22e. The blade 28 is close to the through hole 22e on the rear side of the two through holes 22e that are separated from each other in the rotation direction R21 and are adjacent to each other in the rotation direction R21.

The vanes 28 are arranged obliquely with respect to the radial direction of the rotor 21 . The vane 28 is adjacent to the through hole 22e at the curved portion 28b. The sweep angle RDn of the curved portion 28b is larger than that of the straight portion 28a. The vanes 28 extend from the radially inner side toward the radially outer side of one through hole 22e. The vane 28 extends in the rotation direction R21 to the front side of the other through hole 22e, which is located on the rear side of the above-mentioned one through hole 22e. The blade 28 extends in a manner of wrapping around the through hole 22e at the curved portion 28b. The curved portion 28b extends so as to wrap around the radially outer arc portion of the through hole 22e.

A portion of the curved portion 28b overlaps with the through hole 22e. This portion protrudes from the bottom plate 22c in an eaves shape to the upper side of the through hole 22e. The vanes 28 may be partially disposed above the through holes 22e. However, the vanes 28 are not arranged so as to divide one through hole 22e into two. That is, the vanes 28 do not extend above the through holes 22e. Thereby, breakage of the vane 28 can be suppressed. All of the plurality of blades 28 are located at the above-described positions with respect to the plurality of through holes 22e. The plurality of vanes 28 are in the above-described positions with respect to all of the plurality of through holes 22e. The plurality of blades 28 are respectively positioned on the front side or the rear side of each of the plurality of through holes 22e.

The vane 28 may also be in contact with the peripheral edge portion of the through hole 22e. In addition, the vane 28 may block a part of the through-hole 22e by crossing the peripheral edge part of the through-hole 22e. However, it is not suitable that the vane 28 blocks the entire through hole 22e, or the vane 28 divides the through hole 22e into a plurality of regions.

FIG. 3 shows a schematic cross section along the line III-III in FIG. 2 . Here, the bottom plate 22c and the fan 25 are illustrated. When the rotor 21 rotates in the rotation direction R21, the air outside the rotor 21 flows as the outside flow OTF, and the air inside the rotor 21 flows as the inside flow INF. The vanes 28 generate an upflow LF that flows away from the vanes 28 . At this time, an increase in pressure occurs on the front side LS of the vane 28 in the rotational direction R21. The pressure drop occurs on the rear side TS of the vane 28 in the rotational direction R21.

Vanes 28 create an inward flow IWF through through holes 22e. Since the vane 28 is located immediately ahead of the through hole 22e in the rotational direction R21, the inward flow IWF from the outer side to the inner side of the rotor 21 is generated on the rear side TS. In other words, the vanes 28 are close enough to the through holes 22e so that the inward flow IWF can be generated on the rear side TS. That is, the blade 28 is brought close to the through hole 22e on the rear side so that the negative pressure generated on the rear side TS acts on the through hole 22e. Thereby, the flow of the fluid through the through-hole 22e is promoted. The flow of the fluid promotes heat dissipation from the rotor 21 and heat dissipation from the stator 31 . Even if the vanes 28 are in contact with the peripheral edge portions of the through holes 22e or the vanes 28 block a part of the through holes 22e, heat dissipation from the rotor 21 and heat dissipation from the stator 31 can be promoted.

The vanes 28 are formed continuously from the inner tube 22a to the outer tube 22b. The vanes 28 are arranged on the side surface opposite to the stator 31 even inside the rotor 21 . The vanes 28 are preferably configured in this manner. As a result, interaction with air, which will be described later, occurs.

It is generally known that the ambient temperature inside the rotor 21 will be higher than the ambient temperature outside the rotor 21 due to the heating of the stator coil 33 and the heating of the rotor core 22 and/or the stator core 32 . Therefore, the low-temperature fluid outside the rotor 21 can be efficiently flowed into the inside of the rotor 21, and the heat dissipation effect can be improved. Since the through hole 22e is arranged in the vicinity of the stator coil 33, when the relatively low-temperature inward flow IWF is introduced from the outside to the inside, the low-temperature fluid is supplied to the stator coil 33. Therefore, the above structure further improves the heat dissipation effect. In addition, the vanes 28 that are continuous from the radially outer side toward the radially inner side can supply relatively low-temperature fluid to the entire stator core 32 that generates heat.

Also, the vanes 28 gradually approach the edge of the through hole 22e from the radially inner side toward the radially outer side. Also, the blade 28 is bent at the curved portion 28b so as to be wrapped around the through hole 22e. Therefore, inside the rotor 21 , a stronger inward flow IWF is generated at the outer portion of the through hole 22e on the radially outer side of the rotor 21 while generating a flow from the radially inner side toward the radially outer side.

According to the above-described embodiment, the airflow can be efficiently generated by the simple structure of arranging the vanes 28 inside the rotor 21 . There is also provided a rotor 21 of a rotary electric machine for an internal combustion engine, which efficiently generates flow by the blades 28 arranged inside the rotor 21 . Furthermore, a rotary electric machine for an internal combustion engine provided with the rotor 21 is provided.

Second Embodiment

This embodiment is a modification of the form based on the previous embodiment. In the above-described embodiment, the vanes 28 are upright plates parallel to the central axis AX. Alternatively, the vanes may also be inclined plates inclined with respect to the central axis AX.

In FIG. 4 , the vanes 228 are inclined with respect to a plane parallel to the central axis AX. The inclination direction thereof is the backward direction with respect to the rotation direction R21. That is, the blade|wing 228 is inclined so that it may move to a backward direction in the rotation direction R21 as it moves away from the bottom plate 22c. The vanes 228 are provided by inclined plates. The vanes 228 can efficiently generate the inward flow IWF.

3rd Embodiment

This embodiment is a modification of the form based on the previous embodiment. In the above-described embodiment, the vane 28 is arranged on the front side of the through hole 22e in the rotational direction R21. Alternatively, the vane may be arranged on the rear side in the rotation direction R21 of the through hole 22e.

In FIG. 5 , the vane 328 is close to the one through hole 22e located on the front side in the rotation direction R21 among the two through holes 22e provided apart from each other in the rotation direction R21. Also, the leading edge of the vane 328 is positioned in contact with the edge of the through hole 22e. The leading edge of the vane 328 is curved so as to protrude forward in the rotational direction R21. In this bend, the leading edge of the vane 328 is in contact with the edge of the through hole 22e. Since the blade 328 has a sweep angle RDn, the point of contact of the curvature of the blade 328 with the edge of the through hole 22e is located more radially inward. In other words, most of the through hole 22e expands radially outside the point where the curvature of the blade 328 contacts the edge of the through hole 22e. Also, a part of the cavity 22g expands radially outward from the point of contact of the curvature of the vane 328 with the edge of the through hole 22e. A part of this cavity 22g provides a triangular cavity gradually narrowing toward the rear in the rotation direction R21 on the radially outer side. As a result, an increase in pressure occurs in a part of the cavity 22g.

FIG. 6 shows a schematic cross section along the line VI-VI in FIG. 5 . Vanes 328 create outgoing flow OWF through through holes 22e. Since the vane 328 is located immediately behind the through hole 22e in the rotational direction R21, an outward flow OWF from the inner side to the outer side of the rotor 21 is generated on the front side LS. In other words, the vanes 328 are close enough to the through holes 22e to generate the outgoing flow OWF on the front side LS. That is, the vane 328 is brought close to the through hole 22e on the front side LS of the vane 328 so that the positive pressure generated on the front side LS acts on the through hole 22e. Thereby, the flow of the fluid through the through-hole 22e is promoted. The flow of the fluid can promote heat dissipation from the rotor 21 and heat dissipation from the stator 31 . The plurality of vanes 328 facilitate efficient flow generation within the rotor 21 .

The vane 28 may also be in contact with the peripheral edge portion of the through hole 22e. In addition, the vane 28 may block a part of the through-hole 22e by crossing the peripheral edge part of the through-hole 22e. However, it is not suitable that the vane 28 blocks the entire through hole 22e, or the vane 28 divides the through hole 22e into a plurality of regions.

In the present embodiment, the high-temperature fluid inside the rotor 21 is discharged to the outside of the rotor 21 . The relatively low-temperature fluid outside the rotor 21 is supplied from the outer side of the stator 31 (the left side in FIG. 1 ) in the axial direction through the open end of the rotor 21 . The left side of FIG. 1 is the outer side of the fuselage 13 , which is the cover of the engine 12 in many cases. Therefore, in many cases, the left side of FIG. 1 is mostly exposed to the outside of the engine 12, and it is easy to exchange heat with the external environment. As a result, the fluid introduced from the left side of FIG. 1 is often low temperature. Therefore, the above-described configuration makes it easy to introduce a relatively low-temperature fluid into the rotor 21 .

In the present embodiment, both the outward flow OWF and the inward flow IWF may be generated in one through hole 22e. For example, the outgoing flow OWF is generated at the point of contact of the vane 328 with the edge of the through hole 22e, and the inward flow IWF is generated at the outer endpoint L3. In addition, the vane 328 may be inclined in the advancing direction so as to cover the through hole 22e on the front side. In this case, a stronger outgoing flow OWF is generated. The contact point of the vane 328 with the edge of the through hole 22e may be formed by the straight portion 28a. The contact point of the vane 328 with the edge of the through hole 22e may also be formed by the curved portion 28b.

Other implementations

The disclosure in this specification, drawings, etc. is not limited to the illustrated embodiment. The present disclosure includes the enumerated embodiments and modified embodiments that those skilled in the art can obtain based on them. For example, the present disclosure is not limited to the combinations of components and/or elements disclosed in the embodiments. The present disclosure can be implemented in various combinations. The present disclosure may also include additional sections that may be added to the embodiments. The present disclosure includes embodiments in which components and/or elements in the embodiments are omitted. The present disclosure includes permutations or combinations of components and/or elements between one embodiment and other embodiments. The technical scope of the present invention is not limited to the scope described in the embodiments. The disclosed technical protection scope is determined by the description of the claims, and should be understood to include all changes within the meaning and scope equivalent to the description of the claims.

The above-described embodiment includes the fan 25 made of resin. Alternatively, the fan 25 may be made of metal. The fan 25 is preferably a non-magnetic body. The fan 25 made of a non-magnetic body can prevent leakage of the magnetic flux, and can also suppress iron loss in the fan 25 caused by the leakage of the magnetic flux. Additionally, the fan 25 may also be provided by the bracket 24 . For example, raised portions corresponding to the vanes 28 , 228 , 328 may be formed on a portion of the bracket 24 . In addition, the bracket 24 may be insert-molded on the fan 25 made of resin.

In the above-described embodiment, the plurality of through holes 22e are arranged at equal angular intervals. Furthermore, the plurality of through holes 22e are separated from the central axis AX at equal distances. Alternatively, the plurality of through holes 22e may be arranged at unequal intervals. Furthermore, the distances from the center axis AX of the plurality of through holes 22e may be dispersed. For example, the distances from the center axis AX of the plurality of through holes 22e may be alternately different.

In the above-described embodiment, the through hole 22e is in contact with the curved portion 28b. Alternatively, the through hole 22e and the straight portion 28a may also be in contact. In addition, the boundary between the straight portion 28a and the curved portion 28b may be in contact with the through hole 22e.

In the above-described embodiment, the plurality of vanes 28, 228, 328 and the plurality of through holes 22e are associated with each other on a one-to-one basis. This structure contributes to high efficiency. Alternatively, there may also be a through hole 22e in which the vanes 28, 228, 328 are not provided. Further, there may be vanes 28 , 228 , and 328 that are not arranged in the through hole 22e. In addition, the through hole 22e may include a plurality of through holes with different diameters.

Claims (10)

1. A rotor of a rotating electric machine for an internal combustion engine, comprising:

a rotor core (22) having a cylindrical outer tube (22b) and a bottom plate (22c) extending toward one end of the outer tube, and provided with a through hole (22e) penetrating through the bottom plate; and

and a blade (28, 228, 328) which is disposed on the bottom plate inside the outer cylinder and is positioned on the front side or the rear side of the through hole in the rotation direction (R21) of the rotor.

2. The rotor of a rotating electrical machine for an internal combustion engine according to claim 1, wherein the blade is located on a front side of the through hole in the rotation direction.

3. The rotor of a rotating electrical machine for an internal combustion engine according to claim 1, wherein the blade is located on a rear side of the through hole in the rotation direction.

4. The rotor of a rotating electrical machine for an internal combustion engine according to any one of claims 1 to 3, wherein the blades are arranged obliquely with respect to a radial direction of the rotor.

5. The rotor of a rotating electrical machine for an internal combustion engine according to claim 4, wherein the blade extends in the rotational direction at a back sweep angle (RDn).

6. The rotor of the rotary electric machine for an internal combustion engine according to any one of claims 1 to 5,

the blade having a linear portion (28a) and a curved portion (28b),

the straight line portion is configured to occupy a radially inner side than the curved line portion,

the curved portion is configured to occupy a radially outer side than the straight portion.

7. The rotor of a rotating electrical machine for an internal combustion engine according to claim 6, wherein the curved portion is in contact with an edge of the through hole.

8. The rotor of a rotating electrical machine for an internal combustion engine according to any one of claims 1 to 7, having a plurality of the through holes and a plurality of the blades,

wherein the plurality of blades are respectively positioned at the front side or the rear side of the plurality of through holes.

9. The rotor of the rotary electric machine for an internal combustion engine according to any one of claims 1 to 8,

the blades are provided as part of a fan (25) having an inner ring (26) and an outer ring (27), extend between the inner and outer rings, and are made of resin.

10. A rotating electric machine for an internal combustion engine, comprising:

a rotor (21) according to any one of claims 1-9, and

a stator (31) opposite the rotor.

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