JPWO2018221237A1 - Rotating electric machine for internal combustion engine - Google Patents

Abstract

The rotating electrical machine (10) includes a rotor (21) and a stator (31). The rotor has a nozzle (51) for forming an oil jet (61). The central axis (56) of the nozzle is directed to the exposed core portion of the stator core (32). As a result, the jet does not directly hit the stator coil (33). Damage to the resin covering the stator coil is suppressed. The central axis of the nozzle extends without intersecting the rotor core (22) on the radially outer side and the radially inner side of the nozzle. Such arrangement of the central axis facilitates the arrangement of the processing tools and increases the degree of freedom of selection of the processing tools in the process of machining the large diameter hole (54) and the small diameter hole (55).

Description

Cross-reference of related applications

  This application is based on Japanese Patent Application No. 2017-107745 filed in Japan on May 31, 2017, and the contents of the basic application are incorporated by reference in their entirety.

  The disclosure in this specification relates to a rotating electrical machine for an internal combustion engine.

  Patent document 1 discloses the rotary electric machine for internal combustion engines. The prior art forms a jet of oil injected from the rotating shaft. The oil jet is directed to the coil end and directly collides with the coil end.

JP2013-9508A

  The coil end is a bundle of a plurality of strands. The coil end is fixed and protected by being covered with an electrically insulating resin such as epoxy or varnish. However, in the configuration of the prior art, for example, the resin may be damaged by a jet of cooling liquid such as oil or a foreign substance contained in the cooling liquid. Moreover, in the case where it is remarkable, peeling of the resin may occur. These resin damages impair the durability of the rotating electrical machine for the internal combustion engine.

  In the above-mentioned viewpoints or other aspects not mentioned, there is a need for further improvements in rotating electrical machines for internal combustion engines.

  One object disclosed is to provide an oil-cooled type rotating electrical machine for an internal combustion engine having high durability.

  Another object of the disclosure is to provide a rotating electrical machine for an internal combustion engine that can cool a coil while protecting the coil.

  Another object to be disclosed is to provide a rotating electrical machine for an internal combustion engine that can cool the entire stator while suppressing mechanical damage to the resin of the coil.

  A rotating electrical machine for an internal combustion engine disclosed herein is mounted on a rotor core (22) having a permanent magnet (23) disposed on an inner surface, a stator core (32) disposed radially inward of the rotor core, and a part of the stator core. And a stator coil (33) protected by a resin (34), and a nozzle formed on the rotor core for forming a jet (61) of cooling liquid, without directing the stator coil. Has a nozzle (51) pointing to

  According to the disclosed rotating electrical machine for an internal combustion engine, the coolant is jetted by the nozzle. The nozzle is directed to the stator core without being directed to the stator coil. For this reason, the jet formed by the nozzle directly hits the stator core without directly hitting the stator coil protected by the resin. For this reason, damage to the resin due to the cooling liquid or the foreign matters contained in the cooling liquid is suppressed. The cooling liquid cools the stator core and the stator coil. For this reason, a highly durable rotating electrical machine is provided.

  The disclosed embodiments of the present specification employ different technical means to achieve each purpose. The reference numerals in parentheses described in the claims and this section exemplify the correspondence with the embodiments described later, and are not intended to limit the technical scope. The objects, features, and advantages disclosed in this specification will become more apparent with reference to the following detailed description and accompanying drawings.

It is sectional drawing modeled of the rotary electric machine which concerns on 1st Embodiment. It is sectional drawing modeled of the stator coil. It is a perspective sectional view showing the detailed shape of a rotating electrical machine. It is a perspective sectional view showing the detailed shape of the rotating electrical machine of the second embodiment.

  A plurality of embodiments will be described with reference to the drawings. In embodiments, functionally and / or structurally corresponding parts and / or associated parts may be assigned the same reference signs or reference signs that differ by more than a hundred. For the corresponding parts and / or associated parts, the description of other embodiments can be referred to.

First Embodiment In FIG. 1, a rotating electrical machine for an internal combustion engine (hereinafter simply referred to as a rotating electrical machine 10) is a generator. The rotating electrical machine 10 can be used for a vehicle, a ship, or an aircraft. The rotating electrical machine 10 can be used for a saddle-ride type vehicle.

  The rotating electrical machine 10 is assembled to the internal combustion engine 12. The internal combustion engine 12 includes a body 13 and a rotary shaft 14 that is rotatably supported by the body 13 and rotates in conjunction with the internal combustion engine 12. The body 13 is a structure such as a crankcase or a transmission case of the internal combustion engine 12. The body 13 defines a cavity 13a in which oil for lubricating the internal combustion engine 12 can exist. The oil functions as a coolant for the rotating electrical machine 10. The oil also has a function of adjusting the temperature of the internal combustion engine 12. For example, the body 13 defines a cavity 13 a between the main case and the cover of the internal combustion engine 12. The rotating electrical machine 10 is accommodated in the cavity 13a.

  The rotating electrical machine 10 is assembled to the body 13 and the rotating shaft 14. The rotating shaft 14 is a crankshaft of the internal combustion engine 12 or a rotating shaft interlocking with the crankshaft. The rotating shaft 14 rotates when the internal combustion engine 12 is operated. The rotating shaft 14 drives the rotating electrical machine 10 to function as a generator.

  The rotating electrical machine 10 is an outer rotor type rotating electrical machine. It has a rotor 21 and a stator 31. In the following description, the term “axial direction” refers to a direction along the central axis when the rotor 21, the stator 31, or the stator core 32 is regarded as a cylinder. The term “radial direction” refers to a 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 element. The entire rotor 21 is cup-shaped. The rotor 21 is fixed to the end of the rotating shaft 14. The rotating shaft 14 has an outer surface 14 a for receiving the rotor 21. The outer surface 14a is a tapered surface that tapers. The rotor 21 and the rotating shaft 14 are connected via a positioning mechanism in the rotational direction such as key fitting. The rotor 21 is fastened and fixed to the rotating shaft 14 by a nut 14b that is a fixing member. The rotor 21 rotates together with the rotating shaft 14. The rotor 21 provides a field by a permanent magnet.

  The rotor 21 has a cup-shaped rotor core 22. The rotor core 22 is connected to the rotating shaft 14 of the internal combustion engine 12. The rotor core 22 provides a yoke for a permanent magnet described later. The rotor core 22 is made of a magnetic metal. The rotor 21 has a permanent magnet 23 disposed on the inner surface of the rotor core 22.

  The rotor core 22 includes an inner cylinder 22a, an outer cylinder 22b, and a bottom plate 22c. The inner cylinder 22 a is connected to the rotating shaft 14. The inner cylinder 22a provides a boss portion. The outer cylinder 22b is located on the radially outer side of the inner cylinder 22a and 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 between the inner cylinder 22a and the outer cylinder 22b.

  The inner cylinder 22 a has a through hole that receives the rotation shaft 14. The inner cylinder 22a has an inner surface 22d. The inner surface 22d is a tapered surface that contacts the outer surface 14a. A transition surface 22e that smoothly connects the outer surface of the inner tube 22a and the inner surface of the bottom plate 22c is provided between the inner tube 22a and the bottom plate 22c. The transition surface 22e is a surface whose diameter gradually increases from the inner cylinder 22a toward the bottom plate 22c. The transition surface 22e is formed by a concave curved surface. The inner cylinder 22a, the outer cylinder 22b, and the bottom plate 22c are formed of a continuous material.

  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 can receive the rotating shaft 14 and the inner cylinder 22a. The stator 31 has an outer peripheral surface that faces the inner surface of the rotor 21 via a gap.

  The stator 31 has a stator core 32. The stator core 32 is disposed inside the rotor 21. The stator core 32 is fixed to the body 13 of the internal combustion engine 12. The shape of the stator core 32 is characterized by an annular portion provided on the radially inner side and a plurality of teeth (saliency poles) provided on the radially outer side.

  The stator 31 has a stator coil 33 attached to a stator core 32. The stator coil 33 is attached to a part of the stator core 32. The stator coil 33 is wound around the stator core 32. The stator coil 33 is a multiphase winding. The stator coil 33 is disposed on the radially outer teeth 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 that are fixing members. The bolt 35 passes through 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 rotating electrical machine 10 or a part of the internal combustion engine 12.

  The internal combustion engine 12 has a supply device 41 for supplying oil to the cavity 13a. The supply device 41 includes an oil pan 43 that stores oil and an oil pump 42. The supply device 41 includes a circulation path that passes through the cavity 13a. The circulation path has an axial passage 14 c provided in the rotating shaft 14. The axial passage 14 c extends in parallel with the central axis of the rotating shaft 14. Further, the circulation passage has a radial passage 14 d provided in the rotating shaft 14.

  The radial passage 14 d is inclined with respect to the central axis of the rotating shaft 14. The radial passage 14d opens to the outer surface 14a and the axial passage 14c. The radial passage 14d opens to the axial passage 14c at one end on the radially inner side. The radial passage 14d opens to the outer surface 14a at the other outer end in the radial direction. The radial passage 14d is in fluid communication between the outer surface 14a of the rotating shaft 14 and the inside of the axial passage 14c. The axial direction passage 14 c and the radial direction passage 14 d are passages for supplying oil for cooling the rotating electrical machine 10.

  The rotor 21 has a nozzle 51. The nozzle 51 is also a part of the circulation passage. The nozzle 51 has a passage shape for forming an oil jet 61. The nozzle 51 is formed in the rotor core 22. The nozzle 51 is provided at a connecting portion between the inner cylinder 22a and the bottom plate 22c. The nozzle 51 opens on the inner surface 22d and the transition surface 22e. The nozzle 51 is open to the inner surface 22d at one end on the radially inner side. The nozzle 51 is open to the transition surface 22e at the other radially outer end. The nozzle 51 extends in the radial direction. The nozzle 51 communicates the inner surface 22 d and the transition surface 22 e through the rotor core 22.

  The opening of the radial passage 14d in the outer surface 14a and the opening of the nozzle 51 in the inner surface 22d are in fluid communication. The nozzle 51 receives oil from the radial passage 14d and injects it outward in the radial direction. The nozzle is a passage that supplies oil for cooling the rotating electrical machine 10.

  The position of the opening of the radial passage 14d in the outer surface 14a and the position of the opening of the nozzle 51 in the inner surface 22d coincide with each other in the circumferential direction and the axial direction so that oil flows. There may be circumferential grooves and / or axial grooves on the outer surface 14a and / or the inner surface 22d for providing communication between the radial passage 14d and the nozzle 51.

  The central axis of the nozzle 51 is inclined with respect to the central axis of the rotating shaft 14. The nozzle 51 is inclined so as to extend outward in the radial direction from the internal combustion engine 12 side of the rotating shaft 14, that is, from the base end side toward the distal end side of the rotating shaft 14. The nozzle 51 is inclined so as to face a narrow cavity formed between the rotor 21 and the stator 3. The nozzle 51 is located on the extension of the radial passage 14d. The central axis of the nozzle 51 coincides with the central axis of the radial passage 14d.

  Oil is stored in an oil pan 43. The oil is assembled from the oil pan 43 by the oil pump 42. The oil pump 42 circulates oil through the circulation path. Oil is supplied to the axial passage 14c. Oil is supplied from the axial passage 14c to the radial passage 14d. Oil is supplied to the nozzle 51 from the radial passage 14d. The oil is injected from the nozzle 51 to form a jet 61. The oil adjusts the temperature of the rotating electrical machine 10. In many cases, the oil cools the rotating electrical machine 10. The oil returns from the cavity 13a to the oil pan 43 again. Note that the circulation path may include an oil cooler. The circulation path may include a strainer that captures foreign matter.

  The nozzle 51 is directed to the stator core 32 without being directed to the stator coil 33. The nozzle 51 forms an oil jet 61. Therefore, the jet 61 is also directed to the stator core 32 without being directed to the stator coil 33. The jet 61 has a central axis defined by the nozzle 51. The central axis of the jet 61 coincides with the mechanical central axis of the nozzle 51. The jet 61 extends from the transition surface 22e toward the radially outer side.

  The jet 61 is directed to the annular portion on the radially inner side of the stator 31. The jet 61 is not directed to the annular portion on the radially outer side of the stator 31. The jet 61 is directed to the end surface of the stator core 32. The jet 61 is directed to the exposed portion of the stator core 32. The jet 61 is directed so as to avoid the stator coil 33. The jet 61 does not directly hit the stator coil 33. The jet 61 extends outward in the radial direction. The jet 61 is inclined from the corner between the inner cylinder 22 a and the bottom plate 22 c of the rotor 21 toward the opening of the rotor 21.

  FIG. 2 is a cross-sectional view showing the stator coil 33 as a model. The coil wire 33a that forms the stator coil 33 includes a single-wire conductor 33b and a resin 33c that covers the conductor 33b. The coil wire 33a may be provided by a plurality of conductors such as two. The conductor 33b is made of a copper-based metal such as copper or a copper alloy. The conductor 33b may be made of an aluminum-based metal such as aluminum or an aluminum alloy. Therefore, the coil wire 33a forming the stator coil 33 is protected by the resin 33c.

  Further, the stator coil 33 as a bundle of coil wires 33a is covered with a resin 33d such as varnish or epoxy. The coil 33 is fixed by the resin 33d. Resin 33d fixes a plurality of adjacent coil wires 33a and / or coil wires 33a and other members. The resin 33d fixes the coil wire 33a to an insulator called a core, teeth, bobbin, and an insulating layer attached to the core surface. Therefore, the stator coil 33 is protected by the resin 33d.

  In this specification, both the resin 33c covering the coil wire 33a and the resin 33d covering the stator coil 33 are referred to as a resin 34 for protecting the stator coil 33. The resin 34 has an insulating property. According to this embodiment, damage to the resin 34 caused by oil or a foreign substance contained in the oil is suppressed.

  FIG. 3 shows a specific shape of the rotating electrical machine 10. The stator core 32 is fixed to the body 13 by a plurality of bolts 35. The plurality of bolts 35 are disposed on the radially inner portion of the stator core 32, that is, on the annular exposed portion. The bolt 35 includes a head portion 35a. The plurality of heads 35 a are located at the annular exposed portion of the stator core 32. The plurality of heads 35a are arranged on a circular track. The head portion 35a is located between the stator core 32 and the bottom plate 22c.

  The plurality of bolts 35 are received in through holes formed in the stator core 32. The stator core 32 includes a first end plate 32a, a core portion 32b, and a second end plate 32c. The first end plate 32a, the core portion 32b, and the second end plate 32c are made of electromagnetic steel plates. The core portion 32b is a laminated body in which a plurality of electromagnetic steel plates are laminated. The first end plate 32a and the second end plate 32c may be magnetic metal plates.

  The stator 31 has an insulator 36. The insulator 36 is made of an electrically insulating resin. The insulator 36 is disposed between the stator core 32 and the stator coil 33. A part of the insulator 36 extends above the stator core 32. The stator coil 33 is covered with a resin 34 on the insulator 36.

  The nozzle 51 has an inlet 52 located on the inner surface 22d and an outlet 53 located on the transition surface 22e. The area of the inlet 52 is larger than the area of the outlet 53. The nozzle 51 has a large diameter hole 54 and a small diameter hole 55.

  Large diameter hole 54 provides an inlet 52. The large diameter hole 54 has a predetermined inner diameter. The large diameter hole 54 extends from the inner surface 22d into the inner cylinder 22a. The large diameter hole 54 terminates in the inner cylinder 22a. The large diameter hole 54 is a cylindrical hole processed by a drill.

  The small diameter hole 55 opens in the wall surface of the large diameter hole 54. The small diameter hole 55 is disposed behind the large diameter hole 54 along the oil flow direction. The small diameter hole 55 has an inner diameter smaller than the large diameter hole 54. The small diameter hole 55 is formed so as to define the shape of the jet 61. The small diameter hole 55 extends from the end of the large diameter hole 54 into the inner cylinder 22a. The small diameter hole 55 opens in the transition surface 22e. The outlet 53 is provided by a small diameter hole 55. The small diameter hole 55 fluidly communicates the inside of the large diameter hole 54 and the transition surface 22e. The small diameter hole 55 is a cylindrical hole processed by a drill. The small diameter hole 55 is directed to the stator core 32 without being directed to the stator coil 33.

  The large diameter hole 54 and the small diameter hole 55 have a common center axis 56. The central axis of the large-diameter hole 54 and the central axis of the small-diameter hole 55 may be arranged away from each other and in parallel. Further, the central axis of the large-diameter hole 54 and the central axis of the small-diameter hole 55 may intersect each other.

  It can be assumed that the central axis of the large-diameter hole 54 and the central axis of the small-diameter hole 55 extend from the nozzle 51 toward the radially outer side and the radially inner side. The central axis 56 does not intersect the rotor 21 on the radially outer side and the radially inner side of the nozzle 51. The central shaft 56 extends from the open end of the rotor 21, that is, the opening opposite to the bottom plate 22c, on the radially outer side. The central axis 56 extends from the opening of the through hole forming the inner surface 22d on the radially inner side. In other words, the nozzle 51 has a central axis 56 that does not intersect the rotor core 22 on the radially inner side of the nozzle 51. The nozzle 51 has a central axis 56 that does not intersect the rotor core 22 on the radially outer side of the nozzle 51. Such arrangement of the central axis of the large-diameter hole 54 and the central axis of the small-diameter hole 55 facilitates the arrangement of the processing tools and increases the degree of freedom in selecting the processing tools in the process of processing the nozzle 51.

  The central shaft 56 extends outside the rotor 21 without intersecting the inner surface 22d. In other words, the inlet 52 can be directly seen along the central axis 56 from the rear end face of the rotor 21. In the manufacturing process, the processing tool can reach the inlet 52 along the central axis 56.

  When there is no stator core 32, the central axis 56 of the small diameter hole 55 does not cross the rotor core 22, for example, the outer cylinder 22b, on the radially outer side. The central shaft 56 of the small diameter hole 55 extends toward the open end of the rotor 21. In the manufacturing process, the processing tool can reach the outlet 53 along the central axis 56.

  In a state where the rotating electrical machine 10 is assembled on the internal combustion engine 12 (hereinafter referred to as a regular assembled state), the rotor 21 and the stator 31 are fixed in the illustrated state. That is, the stator 31 is disposed in the rotor 21. In this state, the rotating shaft 14 rotates and the rotor 21 rotates. At the same time, oil is supplied from the supply device 41. The oil flows through the nozzle 51 along the central axis 56. The oil becomes a jet 61 from the outlet 53. The jet 61 flows toward the radially outer side. The jet 61 is mainly formed by the small diameter hole 55. The diameter of the jet 61, for example, the diameter at the position reaching the stator core 32 depends on the diameter of the small diameter hole 55. The divergence angle of the jet 61 depends on the diameter and length of the small diameter hole 55. Further, the roughness of the inner surface of the small-diameter hole 55 and / or the chamfer formed at the outlet also affect the shape of the jet 61.

  In the case of the rotor 21 shown in FIG. 3, the exit 53 of the small diameter hole 55 is provided on the transition surface 22e which is a concave curved surface. When chamfering is formed at the outlet 53, the chamfering on the core side (left side in the figure) is larger than the rotor bottom surface side. The injected oil is pulled by the chamfered surface effect. As a result, the injected oil is not directed to the radially inner portion of the stator core 32, and the direct hit of the stator coil 33 is suppressed.

  The jet 61 rotates with the rotation of the rotor 21. The jet 61 hits the stator 31. Oil is supplied to the entire stator 31 as the jet 61 rotates. The jet 61 moves along the track 62 while hitting the stator core 32. The jet 61 hits the head 35a. The jet 61 intermittently crosses the plurality of heads 35 a while moving along the track 62. The oil that has reached the stator 31 adjusts the temperature of the stator 31 and flows down into the cavity 13a.

  The central axis 56 is also the central axis of the jet 61. The central axis 56 intersects with the stator core 32. In other words, the central axis 56 intersects the radially inner portion of the stator core 32. In other words, the central axis 56 intersects the annular exposed portion of the stator core 32. The central axis 56 does not intersect with the stator coil 33.

  In the normal assembly state, the nozzle 51 is directed to the stator core 32. More specifically, the nozzle 51 is directed to a portion where the stator core 32 is exposed in the radially inner portion of the stator core 32 (hereinafter, core exposed portion). The nozzle 51 is not directed to the stator coil 33. In another aspect, the stator core 32 has an annular core exposed portion where the stator core 32 is exposed without being covered with the stator coil 33. The nozzle 51 is directed to the core exposed portion. In still another aspect, the stator core 32 has an annular portion provided on the radially inner side and a plurality of teeth provided on the radially outer side. The stator coil 33 is attached to a plurality of teeth. The nozzle 51 is directed to the annular portion.

  From another viewpoint, it can be said that the nozzle 51 is directed to the track 62 where the heads 35a of the plurality of bolts 35 are installed. In other words, the central axis 56 of the small diameter hole 55 is directed toward the core exposed portion toward the radially outer side. The central shaft 56 of the small diameter hole 55 is set so as not to reach the stator coil 33. The track 62 is also a locus of intersection of the stator core 32 and the central axis 56. As a result, the jet 61 directly hits the stator core 32 and then flows toward the stator coil 33.

  The manufacturing method of the rotating electrical machine 10 includes a process of manufacturing the rotor 21, a process of manufacturing the stator 31, and a process of combining the rotor 21 and the stator 31 as the rotating electrical machine 10 on the internal combustion engine 12. The step of manufacturing the rotor 21 includes a step of processing a metal material so as to form the rotor core 22, and a step of attaching a permanent magnet 23 to the processed rotor core 22. The process of processing the rotor core 22 includes a basic process of forming a cup-like shape having an inner cylinder 22a, an outer cylinder 22b, and a bottom plate 22c. Further, the processing step of the rotor core 22 includes a nozzle processing step for the nozzle 51 that is performed in the middle of the basic step or after the basic step.

  The nozzle machining process includes a large diameter hole process for machining the large diameter hole 54 and a small diameter hole process for machining the small diameter hole 55. Either the large-diameter hole process or the small-diameter hole process may be performed first. In the large-diameter hole process, the machining tool is applied to the inner surface 22d, and the large-diameter hole 54 is formed. For example, the large-diameter hole 54 is formed from the inner surface 22d by a drill. Since the central shaft 56 does not intersect the rotor core 22, the large-diameter hole 54 is machined while suppressing interference between the machining tool and the rotor core 22. In the small diameter hole process, the processing tool is applied to the transition surface 22e, and the small diameter hole 55 is formed. For example, the small diameter hole 55 is formed from the transition surface 22e by a drill. Since the central shaft 56 does not intersect with the rotor core 22, the small diameter hole 55 is machined while suppressing interference between the machining tool and the rotor core 22. In particular, the chuck device can be brought close to the vicinity of the large diameter hole 54 and / or the small diameter hole 55. Thereby, a thick processing tool can be used, and malfunctions, such as breakage | deflection of a drill and bending, can be suppressed.

  In the large-diameter hole process, the machining tool can be applied to the inner surface 22d from the large-diameter side of the through hole forming the inner surface 22d. For this reason, the contact angle between the inner surface 22d and the processing tool can be close to a right angle. Thereby, the biting of the processing tool with respect to the inner surface 22d can be improved.

  In the small-diameter hole process, the processing tool can be applied to the transition surface 22e from the open end of the rotor core 22. For this reason, the contact angle between the transition surface 22e and the processing tool can be close to a right angle. Thereby, the biting of the processing tool with respect to the inner surface 22d can be improved.

  According to this embodiment, the jet 61 directly hits the exposed core portion of the stator core 32. The jet 61 does not directly hit the stator coil 33. Thereby, the breakage of the resin 34 covering the stator coil 33 due to the oil or the foreign matter contained in the oil is suppressed. In particular, since the small-diameter hole 55 increases the momentum of the jet 61, the resin 34 receives a strong stress. Even in this case, breakage of the resin is suppressed. Since the damage of the resin 34 reduces the durability of the rotating electrical machine 10, according to this embodiment, the rotating electrical machine 10 having high durability is provided. For example, the breakage of the resin 34 allows the coil wire to move, and thus may cause the coil to be disconnected or short-circuited. The damage of the resin 34 may cause foreign matters to be mixed into the injected oil. There is a risk of causing problems in the internal combustion engine and the lubrication path, for example, the strainer. This embodiment suppresses such an undesirable defect.

Second Embodiment This embodiment is a modified example based on the preceding embodiment. In the above embodiment, the direct collision between the stator coil 33 and the jet 61 is suppressed exclusively by the direction of the nozzle 51. In this embodiment, the insulator 36 has a protective wall 236a.

  The protective wall 236a is also called a screen part or an inhibition wall. The protective wall 236 a extends along the radially inner side of the stator coil 33. The protective wall 236a is cylindrical. The protective wall 236a is disposed between the annular portion of the stator core 32 and the plurality of teeth. The protective wall 236 a is erected on a plate-like portion of the insulator 36 that covers the annular portion of the stator core 32. The protective wall 236a extends from the end surface of the stator core 32 in the axial direction. The protective wall 236a covers the radially inner surface of the stator coil 33 within a predetermined range from the stator core 32 in the axial direction. The protective wall 236a is not so high as to cover the entire radially inner surface of the stator coil 33.

  The protective wall 236 a prevents the oil from directly hitting the stator coil 33. The protective wall 236 a suppresses the amount of the jet 61 or a temporary rebounding flow of the jet 61 directly hitting the stator coil 33. The protective wall 236a increases the degree of freedom in correcting conditions such as the oil flow rate and the directing direction of the jet 61 in a direction that improves the cooling performance while suppressing direct collision between the jet 61 and the stator coil 33.

Other Embodiments The disclosure herein is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combinations of parts and / or elements shown in the embodiments. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which parts and / or elements of the embodiments are omitted. The disclosure encompasses 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 scope disclosed is shown by the description of the scope of claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the scope of claims.

  In the above embodiment, the coolant is provided by oil. Alternatively, when the internal combustion engine 12 is water-cooled, the coolant may be provided by water for water cooling.

  In the above embodiment, the rotating electrical machine 10 is connected to the vehicle internal combustion engine 12. Instead of this, the rotating electrical machine 10 may be used for a stationary type or a portable generator.

  In the above embodiment, the rotating electrical machine 10 provides a generator. Instead of this, the rotating electrical machine 10 may provide a generator motor or an AC generator starter. In this case, the rotating electrical machine 10 includes a rotational position sensor for detecting the rotational position of the rotor. The rotational position sensor detects a special magnetic pole of the rotor or a magnetic pole of a permanent magnet. The rotational position sensor is provided between the stator and the body. The rotational position sensor is arranged so that the oil spray is not directly applied. For example, the oil injection port (exit 53) is preferably disposed on the end surface opposite to the end surface on which the rotational position sensor on the stator 31 is installed. In this case, the rotating electrical machine 10 is electrically connected to an electric circuit including an inverter circuit and a control device. The control device controls the electric power supplied to the rotating electrical machine 10 so that the rotating electrical machine 10 functions as an electric motor by controlling the inverter circuit according to the rotational position detected by the rotational position sensor.

  In the above embodiment, the transition surface 22e is provided by a concave curved surface. Alternatively, the transition surface 22e may be a tapered slope. Even on the slope, the inner cylinder 22a and the bottom plate 22c are smoothly connected.

  In the above embodiment, one nozzle 51 is provided. Instead of this, a plurality of nozzles 51 may be provided. The number of nozzles 51 is set according to the required amount of oil.

10 rotating electrical machines, 12 internal combustion engines,
13 body, 13a cavity, 14 axis of rotation,
14a outer surface, 14b nut,
14c axial passage, 14d radial passage,
21 rotor, 22 rotor core, 23 permanent magnet,
31 stator, 32 stator core,
33 stator coil, 33c, 33d, 34 resin,
35 bolt, 35a head, 36 insulator,
41 supply device, 42 oil pump, 43 oil pan,
51 nozzles, 52 inlets, 53 outlets,
54 large-diameter hole, 55 small-diameter hole, 56 central axis,
61 jets, 62 orbits.

A rotating electrical machine for an internal combustion engine disclosed herein is mounted on a rotor core (22) having a permanent magnet (23) disposed on an inner surface, a stator core (32) disposed radially inward of the rotor core, and a part of the stator core. And a stator coil (33) protected by a resin (34), a nozzle formed on the rotor core for forming a jet (61) of cooling liquid, without directing the stator coil. have a nozzle (51) being directed to the nozzle, the large-diameter hole (54) having a predetermined inner diameter, which is placed after the large-diameter hole along the flow direction of the cooling liquid, large-diameter hole Ru and a small-diameter hole (55) having a smaller inner diameter.

Claims (10)

A rotor core (22) having permanent magnets (23) disposed on the inner surface;
A stator core (32) disposed radially inward of the rotor core;
A stator coil (33) attached to a part of the stator core and protected by a resin (34);
A rotating electrical machine for an internal combustion engine having a nozzle (51) that is formed in the rotor core and forms a jet (61) of a cooling liquid and that is directed to the stator core without being directed to the stator coil . The stator core has an annular core exposed portion where the stator core is exposed without being covered with the stator coil,
The rotating electrical machine for an internal combustion engine according to claim 1, wherein the nozzle is directed to the core exposed portion. The stator core has an annular portion provided on the radially inner side and a plurality of teeth provided on the radially outer side,
The stator coil is attached to the plurality of teeth,
The rotating electrical machine for an internal combustion engine according to claim 1, wherein the nozzle is directed to the annular portion. The nozzle includes a large-diameter hole (54) having a predetermined inner diameter,
The small diameter hole (55) which is arrange | positioned after the said large diameter hole along the flow direction of the said cooling fluid, and has an internal diameter smaller than the said large diameter hole. Rotating electric machine for internal combustion engines.   The rotating electrical machine for an internal combustion engine according to claim 4, wherein the small-diameter hole is directed to the stator core without being directed to the stator coil.   The rotary electric machine for an internal combustion engine according to claim 4 or 5, wherein the small diameter hole is formed so as to define a shape of the jet.   The rotating electrical machine for an internal combustion engine according to any one of claims 4 to 6, wherein the large-diameter hole and the small-diameter hole have a common central axis (56).   The rotating electrical machine for an internal combustion engine according to any one of claims 1 to 7, wherein the nozzle has a central axis (56) that does not intersect the rotor core on a radially inner side of the nozzle.   The rotating electrical machine for an internal combustion engine according to any one of claims 1 to 8, wherein the nozzle has a central axis (56) that does not intersect the rotor core on a radially outer side of the nozzle. The rotor core is
An inner cylinder (22a) coupled to the rotating shaft (14) of the internal combustion engine,
An outer cylinder (22b) supporting a permanent magnet on the inner surface, and a bottom plate (22c) extending between the inner cylinder and the outer cylinder;
The inner cylinder has an inner surface (22d),
Between the inner cylinder and the bottom plate, a transition surface (22e) for smoothly connecting the inner cylinder and the bottom plate is formed,
The rotating electrical machine for an internal combustion engine according to any one of claims 1 to 9, wherein the nozzle communicates the inner surface and the transition surface through the rotor core.

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