JP5202143B2 - Outer rotor type vehicle generator - Google Patents

Description

  The present invention relates to a generator that is mounted on a vehicle such as an automobile and generates power by being transmitted from a driving source such as an automobile engine.

  A vehicle such as an automobile is equipped with a generator for supplying power to electrical components. This generator generates electric power by electromagnetic induction from power transmitted from a drive source such as an automobile engine. Such a generator is mounted on, for example, a refrigerated vehicle or a freezer car that cools the cargo compartment and refrigerates or freezes the cargo.

  The generator mounted on the vehicle is also reduced in size and weight for the purpose of saving space in the engine compartment and reducing the weight of the vehicle to improve fuel consumption as the cabin space in the vehicle expands. There is a request for conversion. In general, when the generator is reduced in size and weight, that is, when the output per volume is increased, there arises a problem that heat generation of a coil or the like is promoted. On the other hand, there is a method in which a generator is provided with a fan to blow air and heat-generating parts such as coils are air-cooled.

  For example, Patent Documents 1 and 2 disclose a configuration in which in a vehicle AC generator, a cooling fin is provided in a rotor and a heat generating component such as a coil is air-cooled.

JP 2004-147486 A JP-A-6-46547

  However, in an inner rotor type generator as disclosed in Patent Documents 1 and 2, if a magnet (permanent magnet) is fixed to a rotor serving as a rotor, centrifugal force may be generated in the magnet due to rotation of the rotor and scattered. There is. In addition, when a method using an electromagnet for the rotor is adopted, an exciting current is required to generate a magnetic force in the electromagnet.

  Also, since hands, arms, tools, etc. are inserted into the engine room of an automobile or the like for maintenance or the like, a generator that is arranged in the engine room and the rotor rotates at high speed is usually provided with a frame serving as a cover. It is. If the internal parts of the generator are completely covered with a cover (frame), the air for cooling the internal parts cannot be taken in. Therefore, as disclosed in Patent Documents 1 and 2, there is a through hole serving as a vent hole. Many are formed in the frame used as a cover. However, in vehicles such as automobiles, rainwater and water splashed from the ground can enter the engine compartment, so these waters enter the generator through the through-holes in the cover (frame) and remove internal components. There is a risk of corrosion. This problem becomes more prominent when water containing an antifreezing agent or a cleaning liquid enters the generator.

  If the generator is an outer rotor type, that is, if the rotor yoke (rotor) with the magnet fixed is rotated outside the stator core (stator) around which the coil is wound, the magnet is placed inside the rotor yoke. Since the magnet can be fixed, scattering of the magnet due to rotation of the rotor yoke can be prevented. However, a vent hole penetrating in the radial direction cannot be provided at a location where the magnet is arranged in the rotor yoke. Even if a vent hole penetrating in the radial direction is provided in addition to the location where the magnet is disposed in the rotor yoke, it is difficult to introduce outside air into the rotor yoke through the vent hole because the rotor yoke rotates at high speed. . Further, if a large number of through holes are provided in the rotor yoke, the rigidity of the rotor yoke is lowered, and the dimensional accuracy of the rotor yoke is deteriorated. As a result, rattling and shaft wobbling may occur in the rotor yoke, which may result in a loud noise from the generator or cause failure. Further, as described above, it is not preferable to provide a large number of through holes in a generator cover or the like from the viewpoint of causing corrosion of internal parts.

  The present invention has been made in view of such circumstances, and an outer rotor capable of effectively cooling internal components and withstanding high rotation without providing a large number of through holes in a cover or the like. An object is to provide a generator for a vehicle.

(1) An outer rotor type vehicular generator according to the present invention has a cylindrical core portion, a bearing portion is provided on the first end side in the axial direction of the core portion, and the second end side includes the bearing portion. A support body whose inner space is opened outward, a stator core provided around the core of the support body, a coil wound around the stator core, and a bearing portion of the support body so as to be rotatable A pulley is provided on the first end side, and is opposed to the stator core through a magnetic gap on the inside of a cylindrical yoke portion that extends from the pulley side toward the second end side and opens. And a rotor yoke provided with a magnet. The aforementioned supporting body, and vent holes penetrating the core in the radial direction is provided at the first end side, the rotor yoke is at the second end side opens in the axial direction, and the inside of the yoke portion A fin that rotates with the yoke portion and blows air toward the opening on the second end side is provided on the first end side.

  An outer rotor type vehicular generator according to the present invention is mounted on a vehicle such as an automobile, and is driven and transmitted from a driving source such as an automobile engine to generate electric power by electromagnetic induction. This electromagnetic induction is performed mainly with a coil wound around a stator core as a stator and a magnet provided on a rotor yoke that rotates outside the stator core as a rotor.

  The stator core is arranged so as to surround the periphery of the core portion of the support body. The core part of the support body has a cylindrical shape. The direction in which this cylindrical inner space extends is the axial direction, and the rotor yoke rotates around this axial direction. A bearing portion is provided on the first end side in the axial direction of the core portion. A rotor yoke is pivotally supported on the bearing portion and rotates around the axial direction of the core portion. In a state where the rotor yoke is pivotally supported by the bearing portion, a magnet provided inside the yoke portion is opposed to the stator core with a magnetic gap therebetween.

  A pulley is provided on the first end side of the rotor yoke, and drive is transmitted to the pulley from a drive source such as an automobile engine. When the pulley rotates, a magnet provided in the yoke portion rotates and electric power is generated in the coil by electromagnetic induction.

  As for the core part of a support main body, the inner space is opened in the 2nd end side. Through this opening, outside air can enter the inner space of the core. Further, the core portion is provided with a vent hole penetrating in the radial direction on the first end side. Therefore, the outside air that has entered the inner space from the opening of the core portion on the second end side can flow out to the outside of the core portion through the ventilation port on the first end side.

  The rotor yoke is provided with a fin on the first end side inside the yoke portion. The fin rotates with the yoke portion and blows air from the first end side toward the second end side. When the air pressure on the first end side inside the yoke portion decreases due to this air blowing, outside air is sucked into the inside of the yoke portion from the vent hole of the core portion described above. As a result, outside air flows from the opening of the core portion on the second end side to the first end side of the yoke portion through the inner space of the core portion and the ventilation port, and further blown to the fins, between the teeth of the stator core and the magnet. The magnetic gap flows from the first end side to the second end side. And it discharges | emits outside from the 2nd end side which is the front-end | tip of a yoke part. The internal components of the outer rotor type vehicle generator are cooled by the flow of the outside air.

  (2) It is preferable that the vent hole is disposed between the bearing portion and the stator core.

  As a result, the outside air guided from the ventilation port to the inside of the yoke portion can be directly blown to the stator core, so that the cooling efficiency is improved.

  (3) Examples of the fin include a plurality of fins each extending in the radial direction on the inner side of the yoke portion and arranged radially about the axis.

  (4) The support main body may be provided with a cover that covers the rotor yoke from the radially outer side.

  Thereby, it can prevent that a person and a tool contact the rotor yoke which rotates at high speed.

  (5) The stator core may include a split core that is divided into predetermined tooth portions and arranged in an annular shape. Each of the divided cores is formed by stacking and integrally fitting a plurality of steel plates having the same shape each having a tooth portion around which the coil is wound and a core yoke portion connected to another divided core. In the core yoke portion, either one of an engagement concave portion and an engagement convex portion that are engaged with each other is formed on an adjacent surface adjacent to the adjacent core yoke portion. The engagement recess and the engagement protrusion are uneven in the circumferential direction in the annular array from the adjacent surface, and the back side or the tip side is wider than the opening or base along the adjacent surface. It is a dimension that is a shape and a gap fit. The core portion of the support body is press-fitted into the hollow of the split cores arranged in an annular shape and fitted with a gap.

  Since the stator core is a split core and the coil is wound before each split core is connected in an annular shape, a space for winding work is secured around the tooth portion of each split core. The coil is tightly wound around the teeth portion.

  In addition, since the engagement concave portion and the engagement convex portion are clearance-fitted, the work of engaging the engagement concave portion and the engagement convex portion while relatively moving in the axial direction in the split core made of laminated steel sheets is performed. It becomes easy. Then, when the core portion of the support body is press-fitted into the hollow portion of the stator core assembled in an annular shape, the engagement state between the engagement concave portion and the engagement convex portion that have been loose due to the gap fitting is closely fitted. Thus, a stator core having a desired outer diameter is formed. Although the radially outward force is applied to each split core by press-fitting the core, the split core does not expand radially outward due to the engagement between the engagement recess and the engagement protrusion. maintain.

  In the present invention, “gap fitting” means that the engagement concave portion and the engagement convex portion are formed in a dimension in which the gap is positive (raises) in the engaged state. This is the opposite concept of “interference fitting” in which the gap with the engaging convex portion is negative.

  According to the outer rotor type vehicular generator according to the present invention, in the core portion of the support body, the outside air enters the inner space of the core portion through the opening on the second end side, and the core portion passes through the ventilation port on the first end side. The outside air that has flowed out to the outside and blown out from the ventilation port is blown to the fins, and flows between the teeth of the stator core and the magnetic gap with the magnet from the first end side to the second end side inside the yoke portion. Since it is discharged to the outside from the second end side which is the tip of the inner part, the internal parts can be effectively cooled without providing a large number of through holes in the cover or the like. Thereby, the corrosion of the internal components by the approach of water can be suppressed.

  In addition, since it is not necessary to provide a radial through hole in the rotor yoke, it is easy to increase the dimensional accuracy of the rotor yoke, and it is possible to suppress rattling or shaft blurring in the rotor yoke. It becomes possible to pivot on a cantilever.

  Further, since the outer rotor type is adopted, it is possible to eliminate the excitation current required for the electromagnet by using a magnet which is a permanent magnet. Further, since the magnet is provided inside the rotor yoke, the outer rotor type vehicular generator capable of withstanding high rotation is realized without scattering of the magnet due to rotation of the rotor yoke.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings as appropriate. In addition, this Embodiment is only one aspect | mode of the outer rotor type vehicle generator which concerns on this invention, and it cannot be overemphasized that an embodiment can be changed in the range which does not change the summary of this invention.

[Explanation of drawings]
FIG. 1 is a front view showing an external configuration of an outer rotor type vehicle generator 10 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the internal configuration of the outer rotor type vehicle generator 10. FIG. 3 is a longitudinal sectional view of the support body 11. FIG. 4 is a longitudinal sectional view of the rotor yoke 14. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is an external perspective view of the split core 41. FIG. 7 is a top view of the split core 41. FIG. 8 is a longitudinal sectional view for explaining the cooling action of the outer rotor type vehicle generator 10.

[Outer rotor type vehicle generator 10]
As shown in FIGS. 1 and 2, the outer rotor type vehicle generator 10 (hereinafter also referred to as “generator 10”) includes a support body 11, a stator core 12, a coil 13, and a rotor yoke 14. The cover 15 is a main component. The generator 10 is mounted on a vehicle such as an automobile, and is driven and transmitted from a driving source such as an automobile engine to generate power by electromagnetic induction. This electromagnetic induction is performed mainly by a coil 13 wound around the stator core 12 as a stator and a magnet 63 provided on a rotor yoke 14 that rotates outside the stator core 12 as a rotor.

[Support body 11]
As shown in FIGS. 2 and 3, the support main body 11 is roughly divided into a substantially cylindrical core portion 21 and a side wall portion 22. The side wall portion 22 is a generally rectangular wall that extends from the second end 24 of the core portion 21 in a direction orthogonal to the axis 101 of the core portion 21. The side wall portion 22 forms a part of the housing of the generator 10 together with a cover 15 described later. An engaging portion 25 that protrudes toward the first end 23 is provided on the peripheral edge of the side wall portion 22. The cover 15 is engaged with the engaging portion 25 to form an integral housing. A plurality of reinforcing ribs 26 extending radially from the axis 101 are formed on the side of the first end 23 in the side wall portion 22.

  The core portion 21 has a substantially cylindrical shape, and is roughly divided into a large-diameter portion 28 and a small-diameter portion 29 according to the outer diameter. The center of the cylindrical core portion 21 is an axis 101, and a rotor yoke 14 described later is rotated around the axis 101. The large diameter portion 28 is a portion into which a stator core 12 described later is press-fitted, and has an outer diameter corresponding to the inner diameter of the hollow portion of the stator core 12. The small diameter portion 29 is a portion where two angular bearings 30 are provided, and corresponds to a bearing portion in the present invention.

  A first step portion 31 is provided in the large diameter portion 28. The first step portion 31 is configured such that the diameter on the second end 24 side is larger than the first end 23 side. The stator core 12 described later is press-fitted into the large diameter portion 28 from the first end 23 side and engaged with the first step portion 31. The stator core 12 press-fitted into the large-diameter portion 28 is axially connected by the first step portion 31 and the bolt 27 that is screwed along the axis 101 at the step that becomes the boundary between the large-diameter portion 28 and the small-diameter portion 29. It is fixed with respect to the 101 direction.

  The small-diameter portion 29 is provided with a second step portion 32. The second stepped portion 32 is configured such that the diameter on the second end 24 side is larger than the first end 23 side. Each angular bearing 30 is inserted into the small diameter portion 29 from the first end 23 side and engaged with the second stepped portion 32. The two angular bearings 30 inserted into the small diameter portion 29 by the second stepped portion 32 and the ring-shaped fastener 33 fitted into the small diameter portion 29 from the first end 23 side are in the direction of the axis 101. Are fixed in parallel.

  The inner space 34 of the core portion 21 is sealed with respect to the first end 23 side and opened with respect to the second end 24 side. The inner space 34 extends along the axis 101 from the second end 24 toward the first end 23, and the vicinity of the second step 32 of the small-diameter portion 29 is at the farthest side with respect to the first end 23 side. It is sealed. Further, the inner diameter of the inner space 34 is formed with a large-diameter portion and a small-diameter portion corresponding to the decrease in the outer diameter from the large-diameter portion 28 to the small-diameter portion 29.

  Near the innermost part of the inner space 34, a ventilation hole 35 that penetrates the core portion 21 in the radial direction is provided. By this ventilation opening 35, the inner space 34 is opened to the outside of the core portion 21. That is, outside air that has entered the inner space 34 from the opening of the core portion 21 on the second end 24 side can flow out of the core portion 21 through the vent holes 34 and 35 on the first end 23 side. In each figure, only two ventilation openings 35 appear, but three or more ventilation openings 35 can be arranged radially around the axis 101.

  The vent hole 35 is disposed between the large diameter portion 28 and the second step 32 of the small diameter portion 29 in the core portion 21. As shown in FIG. 2, by this arrangement, the air vent 35 is arranged between the stator core 12 and the angular bearing 30.

  A shaft 36 is provided at the center of the inner space 34. The shaft 36 is a cylindrical member that protrudes along the axis 101 from the innermost part of the inner space 34 toward the second end 24. A gap is provided between the shaft 36 and the inner surface of the large-diameter portion 28 and the inner surface of the small-diameter portion 29. Accordingly, the inner space 34 is formed around the shaft 36. Although not appearing in each figure, the rigidity of the core portion 21 is enhanced by providing reinforcing ribs from the shaft 36 to the inner surface of the large diameter portion 28. This reinforcing rib is provided in the inner space 34 so as not to block the flow path from the opening on the second end 24 side to each ventilation port 35.

[Stator core 12 and coil 13]
As shown in FIGS. 2 and 5, the stator core 12 is arranged so as to surround the core portion 21 of the support body 11. A coil 13 is wound around the stator core 12. The stator core 12 is formed by connecting 18 divided cores 41 around which a coil 13 is wound in an annular shape.

  The 18 divided cores 41 constituting the stator core 12 have the same shape except that they are arranged in an annular shape, and each divided core 41 is connected to form one annular stator core 12. It is configured. In the present embodiment, the divided core 41 is obtained by dividing the stator core 12 for each tooth portion 42, but the divided core 41 is not necessarily divided for each tooth portion 42. There is no need, and for example, the stator core 12 may be divided for each predetermined number of teeth portions 42.

  As shown in FIGS. 6 and 7, the split core 41 is roughly divided into a tooth portion 42 and a core yoke portion 43. The coil 13 is wound around the tooth portion 42. The core yoke portion 43 is connected to the core yoke portion 43 of the other divided core 41 to form an annular shape. Each of the core yoke portions 43 is formed in an arc shape that is 1/8 of the circumferential width of the annular stator core 12. The teeth portion 42 protrudes outward in the radial direction of the stator core 12 from the core yoke portion 43, and the coil 13 is wound through an insulator or the like for insulation. In such a split core 41, a plurality of steel plates having the same shape in a plan view are laminated in the direction of the axis 101, and the half-cut crimped portion 44 is fitted to each steel plate laminated in the vertical direction (in the direction of the axis 101). It is united by doing.

  The coil 13 is wound before each divided core 41 is connected in an independent state, that is, before it is connected in an annular shape. As a result, a space for winding work is secured around the tooth portion 42 of each divided core 41, so that the coil 13 is tightly wound around the tooth portion 42. Although the winding method of the coil 13 is not particularly limited, one copper wire is continuously wound around the plurality of divided cores 41 using a flyer type or nozzle type winding machine, and the plurality of divided cores 41 are wound. It is preferable to connect them with a connecting wire between the coils 13 to form a group, because the connection work is simplified.

  On each adjacent surface 45 where the core yoke portion 43 of the split core 41 is adjacent to the core yoke portion 43 of the other split core 41, an engagement concave portion 46 and an engagement convex portion 47 are formed. Each adjacent surface 45 forms a plane extending in the axial direction 101 and the radial direction 103 of the stator core 12 at both ends in the circumferential direction 102 of the core yoke portion 43 of the stator core 12. The engaging concave portion 46 and the engaging convex portion 47 extend along the direction of the axis 101 on each adjacent surface 45.

  As shown in FIG. 7, the engagement concave portion 46 and the engagement convex portion 47 have a so-called shape. In detail, the engaging recess 46 is recessed from the adjacent surface 45 of the core yoke portion 43 in the circumferential direction 102 of the stator core 12. The width W2 in the radial direction of the back portion 49 of the engaging recess 46 is wider than the width W1 in the radial direction 103 of the opening 48 where the engaging recess 46 opens in the adjacent surface 45. A dovetail surface 50 that is continuously widened is formed on the back portion 49.

  The engaging convex portion 47 protrudes from the adjacent surface 45 of the core yoke portion 43 in the circumferential direction 102 of the stator core 12. The radial width W2 of the distal end portion 52 of the engagement convex portion 47 is wider than the width W1 of the radial direction 103 of the base portion 51 along the adjacent surface 45 of the engagement convex portion 47. A tapered surface 53 that is continuously widened is formed on the distal end portion 52.

  The engaging concave portion 46 and the engaging convex portion 47 have concave and convex shapes that correspond to each other, and the engaging concave portion 46 and the engaging convex portion 47 are formed at substantially the center in the radial direction 103 on the adjacent surface 45. The engaging concave portions 46 and the engaging convex portions 47 are respectively engaged with the engaging convex portions 47 or the engaging concave portions 46 of the other adjacent divided cores 41, so that the eighteen divided cores 41 form an annular shape as the stator core 12. Assembled into.

  The radial width W1 of the opening 48 of the engagement recess 46 and the radial width W1 of the base 51 of the engagement protrusion 47 have the same dimensions, and the radial width of the inner portion 49 of the engagement recess 46 The width W2 and the radial width W2 of the distal end portion 52 of the engaging convex portion 47 have the same dimensions. Furthermore, the surface 50 with the engagement recess 46 and the taper surface 53 of the engagement projection 47 have the same inclination angle. Therefore, the engagement concave portion 46 and the engagement convex portion 47 are engaged, and in this engaged state, the dovetail surface 50 and the tapered surface 53 are in surface contact, and the adjacent surface 45 of the core yoke portion 43 is adjacent. The other split core 41 is in surface contact with the adjacent surface 45 of the core yoke portion 43.

  Further, the engagement with the engagement concave portion 46 and the engagement convex portion 47 is a so-called gap fitting. In detail, the tolerance of the radial width W1 of the opening 48 of the engaging recess 46 and the radial width W2 of the inner portion 49 is set on the plus side, and the diameter of the base 51 of the engaging convex 47 The tolerance of the width W1 in the direction and the width W2 in the radial direction of the tip 52 is set to the minus side. As a result, a backlash due to tolerance occurs in the engagement between the engagement recess 46 and the engagement protrusion 47. This play facilitates the operation of engaging the engaging recess 46 and the engaging protrusion 47 in the split core 41 made of laminated steel sheets while relatively moving the engaging recess 46 and the engaging protrusion 47 in the direction of the axis 101.

  As shown in FIG. 5, due to the engagement of the engagement recesses 46 and the engagement protrusions 47, the adjacent split cores 41 have the core yoke portions 43 that are opposite to each other in the circumferential direction 102 and the radial direction 103 of the stator core 12. Fixed. That is, the adjacent surfaces 45 of the core yoke portions 43 of the adjacent split cores 41 are maintained in a state in which both ends in the radial direction 103 are matched.

  When the 18 divided cores 41 are assembled with the engaging concave portions 46 and the engaging convex portions 47 engaged with each other, the teeth portion 42 around which the coil 13 is wound is radially projected outward. The stator core 12 is shaped. This annular shape is maintained by the engagement between the engagement recess 46 and the engagement protrusion 47.

  The core portion 21 of the support body 11 is press-fitted into the hollow portion of the stator core 12 assembled in an annular shape. Thereby, the engagement state of the engagement concave part 46 and the engagement convex part 47 in which the backlash has occurred due to the gap fitting becomes a close fitting state. When the core portion 21 is press-fitted, stress is applied to the outer side of the radial direction 103 with respect to each divided core 41 assembled in an annular shape, but the engagement between the engagement concave portion 46 and the engagement convex portion 47. As a result, the split core 41 does not spread outward in the radial direction 103 so as to be separated from the circumferential direction 102. Further, since the engaging concave portion 46 and the engaging convex portion 47 are formed at the substantially center in the radial direction of the adjacent surface 45 of the divided core 41, the stress is averaged with respect to the adjacent surface 45 of each divided core 41. Is loaded.

[Rotor yoke 14]
As shown in FIG. 2, the rotor yoke 14 is supported by the small diameter portion 29 of the core portion 21 of the support body 11 via the angular bearing 30, so that the rotor yoke 14 is rotatably supported around the axis 101. As shown in FIG. 4, the rotor yoke 14 mainly includes a pulley 61, a yoke portion 62, and a magnet 63.

  The pulley 61 is provided on the first end 71 side of the rotor yoke 14. Although not shown in each figure, a belt is stretched around the pulley 61, and drive is transmitted from a drive source such as an automobile engine via the belt. The rotor yoke 14 is rotated about the axis 101 by the drive transmission to the pulley 61. On the inner surface side of the pulley 61, a circumferential surface 64 supported by the angular bearing 30 is formed. A step 65 having a small diameter is formed on the circumferential surface 64 on the first end 71 side, and a groove 67 into which a ring-shaped fastener 66 (see FIG. 2) is fitted is formed on the second end 72 side. ing. As shown in FIG. 2, the angular bearing 30 is positioned with respect to the axis 101 direction on the circumferential surface 64 by the fastener 66 and the step 65 fitted in the groove 67. Note that the first end 71 and the second end 72 are both ends of the rotor yoke 14 in the direction of the axis 101.

  The yoke portion 62 has a cylindrical shape extending from the pulley 61 toward the second end 72 side. The yoke part 62 has a wall part 68 and a cylindrical part 69 as main components. The outer diameter of the yoke portion 62 is larger than the outer diameter of the pulley 61. Accordingly, an annular wall 68 extending from the pulley 61 radially outward is provided, and a cylinder 69 extending from the periphery of the wall 68 in the direction of the axis 101 is provided. The second end 72 side of the cylindrical portion 69 is opened. In consideration of the outer diameter of the stator core 12 described above, the inner diameter of the cylindrical portion 69 is set such that a magnet 63 described later is disposed with a predetermined magnetic gap from the stator core 12. The first end 71 side of the cylindrical portion 69 is opened on the center side of the wall portion 68, but when the rotor yoke 14 is supported by the support body 11 as shown in FIG. 2, the inner peripheral surface 64 is angular. Since the bearing 30 comes into contact and the small diameter portion 29 of the core portion 21 is disposed inside the angular bearing 30, the small diameter portion 29 and the angular bearing 30 are sealed. The pulley 61 and the yoke portion 62 are integrally formed of a mold using a magnetic material. In addition, the diameter of the pulley 61 and the diameter of the yoke part 62 are examples, and the pulley 61 may be larger than the yoke part 62, for example.

  On the inner surface of the cylindrical portion 69 of the yoke portion 62, a 20-pole magnet 63 is arranged and fixed in an annular shape. The magnet 63 is a permanent magnet in which magnet particles are sintered, and as shown in FIG. 5, N poles and S poles are alternately formed in the circumferential direction to form 20 poles. Each magnet 63 fixed to the yoke portion 62 faces the outer peripheral surface of the stator core 12 described above with a predetermined magnetic gap therebetween.

  The magnet 63 may be a known generator magnet such as a so-called ring magnet sintered in a cylindrical shape or a magnet divided by each magnetic pole. In the present embodiment, the 20-pole / 18-slot generator 10 is described as an example. However, in the present invention, the number of poles and the number of slots of the outer rotor type vehicular generator are not particularly limited.

  The yoke portion 62 is provided with fins 70 that rotate together with the yoke portion 62 and blow air toward the second end 72 side. The fins 70 are a plurality of fins each extending in the radial direction with respect to the axis 101 inside the yoke portion 62, and are arranged radially about the axis 101. Each fin 70 has the same shape except that the arrangement with respect to the axis 101 is different. In each figure, only two fins 70 appear.

  The fin 70 extends from the inside of the wall portion 68 provided on the first end 71 side of the yoke portion 62 to the second end 72 side along the axis 101. In the radial direction with respect to the axis 101, the inner end of the fin 70 is in the vicinity of the inner peripheral surface 67, and the outer end reaches the inner peripheral surface of the cylindrical portion 69. That is, the fin 70 has a rib shape extending in the radial direction with respect to the axis 101. A tip 73 of the fin 70 toward the second end 72 is separated from the magnet 63 by a predetermined distance. As shown in FIG. 2, the predetermined distance is set so that the fin 70 does not contact the coil 13 or the like in consideration of the space occupied by the coil 13 or the like of the stator core 12. The fin 70 is integrally formed of a mold using a magnetic material together with the pulley 61 and the yoke portion 62.

[Cover 15]
As shown in FIGS. 1, 2, and 5, a cover 15 that is engaged with the side wall portion 22 of the support body 11 and covers the rotor yoke 14 from the radially outer side is provided. The cover 15 has a prismatic shape on the outside and a cylindrical shape on the inside. The outer prismatic shape is set to a shape and size corresponding to the side wall portion 22 of the support body 11. The inner cylindrical shape is larger than the outer diameter of the rotor yoke 14, and is set to a shape and size that form a gap in the direction of the axis 101 with the rotor yoke 14. The dimension of the cover 15 in the direction of the axis 101 is set such that the cover 15 engaged with the side wall portion 22 covers the yoke portion 62 of the rotor yoke 14 and does not cover the pulley 61. Further, as shown in FIG. 1, the cover 15 is provided with a plurality of through-holes 81 penetrating in the thickness direction in the vicinity of the side wall portion 22 of the support body 11. Water and gas can enter and exit. The through-hole 81 is provided for the purpose of discharging water or the like when the water or the like enters the inside of the cover 15, but is not necessarily provided.

[Cooling action in generator 10]
As described above, when driving is transmitted from a driving source such as an automobile engine via a belt and the pulley 61 rotates, the magnet 63 provided in the yoke portion 62 also rotates. When the magnet 63 rotates around the coil 13, electric power is generated in the coil 13 by electromagnetic induction. The number of revolutions of the yoke part 62 is generally several thousand to several tens of thousands of revolutions per minute, although it depends on the type of automobile engine and the diameter of the pulley 61.

  When the yoke part 62 rotates, the fin 70 provided inside thereof also rotates around the axis 101. By the rotation of the fin 70, as indicated by the arrows in FIG. 8, the air is blown from the first end 71 side to the second end 72 side inside the yoke portion 62. When the air pressure on the first end 71 side inside the yoke portion 62 decreases due to this blowing, outside air is sucked into the yoke portion 62 from the vent hole 35 of the core portion 21. Thereby, the outside air passes through the inner space 34 and the vent hole 35 of the core portion 21 from the opening of the core portion 21 on the second end 24 side, and the yoke portion from between the large-diameter portion 28 of the core portion 21 and the second step 31. The air flows into the inner side of 62 and is further blown to the fins 70 to flow between the divided cores 41 of the stator core 12 and the magnetic gap with the magnet 63 from the first end 71 side to the second end 72 side. Then, the outside air flows around the second end 72 of the yoke portion 62, flows through the gap between the yoke portion 62 and the cover 15 from the second end 72 side to the first end 71 side, and is discharged outside. The outside air that has flowed out from the inside of the yoke portion 62 may be discharged to the outside from the through hole 81 of the cover 15. As the flow of the outside air continues, the stator core 12 is always exposed to the flow of the outside air and cooled.

[Operational effects of this embodiment]
According to the generator 10 described above, outside air enters the inner space 34 of the core portion 21 through the opening on the second end 24 side in the core portion 21 of the support body 11, and passes through the ventilation port 35 on the first end 23 side. The outside air that has flowed out of the core portion 21 and has flowed out of the vent hole 35 is blown to the fins 70, and the magnetic gap between the teeth portion 42 of the stator core 12 and the magnet 63 is formed inside the yoke portion 62. Since it flows from the first end 71 side to the second end 72 side and is discharged to the outside from the second end 72 side, which is the tip of the yoke portion 62, the internal parts are effective without providing a large number of through holes in the cover 15 or the like. Can be cooled. Thereby, the corrosion of the internal components by the approach of water can be suppressed.

  In addition, since it is not necessary to provide a through hole in the radial direction in the rotor yoke 14, it is easy to increase the dimensional accuracy of the rotor yoke 14, and it is possible to suppress the occurrence of rattling or axial blurring in the rotor yoke 14, and to reduce the diameter of the support body 11. In the portion 29, the rotor yoke 14 can be pivotally supported by a so-called cantilever.

  Further, since the outer rotor type is adopted, the magnet 63 that is a permanent magnet can be used to eliminate the excitation current required for the electromagnet. Further, since the magnet 63 is provided inside the rotor yoke 14, the generator 63 that can withstand high rotation is realized without the magnet 63 being scattered by the rotation of the rotor yoke 14.

  Further, since the ventilation opening 35 is disposed between the small diameter portion 29 and the stator core 14, the outside air guided from the ventilation opening 35 to the inside of the yoke portion 62 can be directly blown to the stator core 14. , Cooling efficiency is improved.

  In addition, since the support body 11 is provided with the cover 15 that covers the rotor yoke 14 from the outside in the radial direction, it is possible to prevent people and tools from coming into contact with the rotor yoke 14 that rotates at high speed. Furthermore, since it is not necessary to provide a large number of through holes as vent holes in the cover 15, the rotor yoke 14 that rotates at a high speed can be almost completely covered with the cover 15, so that safety is improved.

  Further, the stator core 12 is constituted by the divided cores 41, and the coils 13 are wound before the divided cores 41 are connected to each other in an annular shape, so that winding work is performed around the tooth portion 42 of each divided core 41. Therefore, the coil 13 is tightly wound around the tooth portion 42.

  In addition, the engagement recess 46 and the engagement projection 47 are fitted into the gap, thereby causing the engagement recess 46 and the engagement projection 47 to move relative to each other in the direction of the axis 101 in the split core 41 made of laminated steel plates. Thus, the engaging operation is facilitated. When the core portion 21 of the support body 11 is press-fitted into the hollow portion of the stator core 12 assembled in an annular shape, the engagement state between the engagement concave portion 46 and the engagement convex portion 47 that have been fitted into the gap is set. The stator core 12 having a desired outer diameter is formed in a close fitting state. A force to the outside in the radial direction 103 is applied to each divided core 41 by press-fitting of the core portion 21, but the divided core 41 is moved to the outside in the radial direction 103 by the engagement between the engagement concave portion 46 and the engagement convex portion 47. The ring shape is maintained without expanding. Thereby, the outer rotor type stator core 12 can be easily assembled as a simple configuration.

FIG. 1 is a front view showing an external configuration of an outer rotor type vehicle generator 10 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the internal configuration of the outer rotor type vehicle generator 10. FIG. 3 is a longitudinal sectional view of the support body 11. FIG. 4 is a longitudinal sectional view of the rotor yoke 14. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is an external perspective view of the split core 41. FIG. 7 is a top view of the split core 41. FIG. 8 is a longitudinal sectional view for explaining the cooling action of the outer rotor type vehicle generator 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Outer rotor type vehicle generator 11 ... Support body 12 ... Stator core 13 ... Coil 14 ... Rotor yoke 15 ... Cover 21 ... Core part 23 ... First end 24 ... second end 29 ... small diameter part (bearing part)
34 ... Inner air 35 ... Ventilation hole 41 ... Split core 42 ... Teeth part 43 ... Core yoke part 45 ... Adjacent surface 46 ... Engaging recess 47 ... Engaging protrusion Part 48 ... opening 49 ... back part 51 ... base 52 ... tip part 61 ... pulley 62 ... yoke part 63 ... magnet 70 ... fin 71 ... first 1 end 72 ... 2nd end 101 ... axis

Claims (5)

A support body having a cylindrical core portion, a bearing portion is provided on the first end side in the axial direction of the core portion, and the inner space of the core portion is opened to the outside on the second end side;
A stator core provided around the core of the support body;
A coil wound around the stator core;
It is rotatably supported by the bearing portion of the support body, a pulley is provided on the first end side, and extends from the pulley side toward the second end side and opens inside a cylindrical yoke portion. A rotor yoke provided with a magnet opposed to the stator core via a magnetic gap,
The support body is provided with a vent hole penetrating the core portion in the radial direction on the first end side,
The rotor yoke is provided with an opening in the axial direction on the second end side, and a fin that rotates with the yoke portion and blows air toward the opening on the second end side on the first end side inside the yoke portion. Outer rotor type vehicle generator.   The generator for an outer rotor type vehicle according to claim 1, wherein the ventilation port is disposed between the bearing portion and the stator core.   3. The outer rotor type vehicle according to claim 1, wherein the fins are a plurality of fins each extending in a radial direction on the inner side of the yoke portion and arranged radially about an axis. 4. Generator.   The outer rotor type vehicular generator according to any one of claims 1 to 3, wherein the support body is provided with a cover that covers the rotor yoke from a radially outer side. The stator core includes divided cores that are divided into predetermined teeth portions and arranged in an annular shape,
Each of the divided cores is formed by stacking and integrally fitting a plurality of steel plates having the same shape each having a tooth portion around which the coil is wound and a core yoke portion connected to another divided core. In the core yoke portion, the adjacent surface adjacent to the adjacent core yoke portion is formed with either one of the engagement concave portion or the engagement convex portion that engage with each other,
The engagement recess and the engagement protrusion are uneven in the circumferential direction in the annular array from the adjacent surface, and the back side or the tip side is wider than the opening or base along the adjacent surface. The shape is a dimension that fits into the gap,
The generator for an outer rotor type vehicle according to any one of claims 1 to 4, wherein the core portion of the support body is press-fitted into a hollow of the split cores arranged in an annular shape and fitted with a gap.

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