JP2010178604A - Rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotating electrical machine that includes a rectifying device which can shorten the time required for diode installation to heatsink base, by devising a support structure to the heatsink base of the diodes. <P>SOLUTION: The diodes 21, 22 at the positive and negative-pole sides are arranged at the first and second heatsink bases 24, 30, by making locking pins 28, 32 penetrate press-insertion holes 40, 41 which are formed at metal bases 21b, 22b and jointed to the first and second heatsink bases 24, 30, by crushing the extended parts of the locking pins 28, 32 from the press-insertion holes 40, 41 and plastically deforming them. According to this, the diodes 21, 22 at the positive and negative-pole sides are brought into close contact with one side faces of the first and second heatsink bases 24, 30 at the bottoms of the metal bases 21b, 22b, and are supported on the first and second heatsink bases 24, 30, while being regulated in movement. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine such as a vehicle alternator, and more particularly to a diode support structure in the rectifier.

  In a conventional rectifier in a vehicle alternator, a positive side and a negative side cooling plate having surfaces formed of arc-shaped planes with different inner diameters are positioned on the same plane perpendicular to the rotation axis, The plurality of positive side diodes are soldered to the surface of the positive side cooling plate and arranged circumferentially, and the plurality of negative side diodes are soldered to the surface of the negative side cooling plate. (See, for example, Patent Document 1).

JP-A-8-182279

  In a conventional rectifier in an automotive alternator, positive and negative diodes are attached to the surfaces of the positive and negative cooling plates by solder bonding. Therefore, at the time of soldering, it is necessary to raise both the positive electrode side and negative electrode side diodes and the positive electrode side and negative electrode side cooling plates to a temperature suitable for solder bonding, which increases the work time for mounting the positive electrode side and negative electrode side diodes. There was a problem.

  The present invention has been made in order to solve the above-described problems, and has been devised to support the diode to the heat sink base, and to provide a rotating device equipped with a rectifier that can shorten the work time for mounting the diode to the heat sink base. The purpose is to obtain an electric machine.

  The rotating electrical machine according to the present invention includes a case, a rotor fixed to the rotating shaft pivotally supported by the case, and a rotor disposed in the case, and supported by the case so as to cover an outer periphery of the rotor. A stator having a stator coil wound around a stator core, and a rectifier electrically connected to the stator coil and rectifying an alternating current generated in the stator coil into a direct current. I have. The rectifier includes a heat sink and a plurality of diodes supported on one surface of the heat sink base of the heat sink, and the plurality of diodes are respectively a metal base and a rectifier bonded on the metal base. An insulating resin portion is formed on the metal base so as to embed the element and the rectifying element and to expose a part of the outer peripheral portion of the metal base. Further, a pin insertion portion is formed in an exposed portion of the metal base from the insulating resin portion, and a locking pin is erected on one surface of the heat sink base so that the plurality of diodes can be fixed. Each of the diodes is disposed on the heat sink base by inserting the locking pin through the pin insertion portion, and the extension portion of the locking pin from the pin insertion portion is plastically deformed and joined to the heat sink base. The bottom of the metal base is supported in close contact with one surface of the heat sink base, and the movement is restricted.

  According to the present invention, the extended portion from the pin insertion portion of the locking pin is plastically deformed, the bottom portion of the metal base is brought into close contact with one surface of the heat sink base, and the movement is restricted and supported. The diode can be supported on the heat sink base without soldering the metal base to the heat sink base. Therefore, it is not necessary to raise the temperature of the metal base and the heat sink base to a temperature suitable for solder bonding, and the time for mounting the diode can be shortened.

1 is a longitudinal sectional view showing an automotive alternator according to Embodiment 1 of the present invention. It is a perspective view which shows the rectifier mounted in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a perspective view which shows the diode non-mounting state of the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 1 of this invention. It is a perspective view which shows the diode applied to the rectifier mounted in the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 1 of this invention. It is a figure explaining the attachment method of the diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 1 of this invention. It is an electric circuit diagram in the vehicle alternator according to Embodiment 1 of the present invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 2 of this invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 3 of this invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 4 of this invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 5 of this invention. It is a figure explaining the attachment method of the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 6 of this invention. It is sectional drawing which shows the attachment state of the positive electrode side diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 7 of this invention. It is sectional drawing which shows the attachment state of the positive electrode side diode in the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 8 of this invention. It is a longitudinal cross-sectional view which shows the alternating current generator for vehicles which concerns on Embodiment 9 of this invention. It is a perspective view which shows the rectifier mounted in the vehicle alternating current generator which concerns on Embodiment 9 of this invention. It is a perspective view which shows the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 10 of this invention. It is a perspective view which shows the positive electrode side diode applied to the rectifier mounted in the alternating current generator for vehicles concerning Embodiment 10 of this invention.

  Hereinafter, preferred embodiments of a rotating electrical machine of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing an automotive alternator according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a rectifier mounted on the automotive alternator according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a diode non-mounted state of the rectifier mounted on the vehicle alternator according to Embodiment 1 of the present invention, and FIG. 4 is a vehicle alternator according to Embodiment 1 of the present invention. FIG. 5 is a cross-sectional view showing a diode applied to a rectifier mounted on an automotive alternator according to Embodiment 1 of the present invention; 6 is a diagram for explaining a diode mounting method in the rectifier mounted on the vehicle alternator according to Embodiment 1 of the present invention, and FIG. 7 is a vehicle alternator according to Embodiment 1 of the present invention. FIG. In FIG. 2, the circuit board 35 is omitted.

  1 and 2, an automotive alternator 100 supports a case 1 composed of a substantially bowl-shaped aluminum front bracket 2 and a rear bracket 3 and a rotating shaft 19 supported by the case 1 via a bearing 4. The rotor 16 rotatably disposed in the case 1, the pulley 5 fixed to the end of the rotating shaft 19 extending to the front side of the case 1, and both ends of the rotor 16 in the axial direction A fan 6 fixed to the surface, a fixed air gap 10 with respect to the rotor 16, a stator 13 surrounding the outer periphery of the rotor 16 and fixed to the case 1, and a rear of the rotating shaft 19 A pair of slip rings 7 that are fixed to the side and supply current to the rotor 16, a pair of brushes 8 that slide on the surface of each slip ring 7, a brush holder 9 that houses these brushes 8, and a stator 13 electrically connected A voltage regulator that adjusts the magnitude of the AC voltage generated in the stator 13 by being attached to the rectifier 20 that converts AC generated in the stator 13 into DC and the heat sink 12 fitted to the brush holder 9 11.

  The stator 13 has a cylindrical stator core 14 and a stator coil 15 wound around the stator core 14, and an alternating current is generated by a change in magnetic flux from a field coil 17, which will be described later, as the rotor rotates. It is equipped with.

  The rotor 16 includes a field coil 17 that generates a magnetic flux when an excitation current is passed, a pole core 18 that is provided so as to cover the field coil 17, and a magnetic pole is formed by the magnetic flux, and an axial center position of the pole core 18. And a rotating shaft 19 penetrating the shaft. The fan 6 is fixed to both end surfaces in the axial direction of the pole core 18 by welding or the like.

  The rectifier 20 includes a positive diode 21, a negative diode 22, a first heat sink 23 that supports the positive diode 21, a second heat sink that supports the negative diode 22, a positive and negative diode 21, 22 and a circuit board 35 that electrically connects the stator coil 15 to each other.

Here, the configuration of the positive and negative side diodes 21 and 22 will be described with reference to FIGS. 4 and 5. FIG.
The positive-side diode 21 is a rectifying element 21a configured by pn-junction of an N-type semiconductor and a P-type semiconductor, and a rectangular flat plate shape solder-bonded to the surface of the rectifying element 21a opposite to the P-type semiconductor of the N-type semiconductor. The metal base 21b, the rectifying element 21a and the metal base 21b are molded to form an insulating resin portion 21c formed into a substantially rectangular parallelepiped shape, and one end is connected to the P-type semiconductor of the rectifying element 21a and extends from the insulating resin portion 21c. The lead terminal 21d is connected to the circuit board 35 at the other end. Here, as for the metal base 21b, both sides protrude from the insulating resin part 21c, and the bottom face is exposed. Also, insertion holes 40 having a circular cross section as pin insertion portions are formed in both side portions of the metal base 21b protruding from the insulating resin portion 21c.

  The negative side diode 22 is a rectifying element 22a configured by pn-junction of an N-type semiconductor and a P-type semiconductor, and a rectangular flat plate shape solder-bonded to a surface of the rectifying element 22a opposite to the N-type semiconductor of the P-type semiconductor. The metal base 22b, the rectifying element 22a and the metal base 22b are molded into a substantially rectangular parallelepiped insulating resin portion 22c, and one end is connected to the N-type semiconductor of the rectifying element 22a and extends from the insulating resin portion 22c. The lead terminal 22d is connected to the circuit board 35 at the other end. Here, as for the metal base 22b, both side parts protrude from the insulating resin part 22c, and the bottom face is exposed. In addition, insertion holes 41 having a circular cross section as pin insertion portions are formed in both side portions of the metal base 22b protruding from the insulating resin portion 22c. In addition, it is preferable to use copper as a material for the metal bases 21b and 22b from the viewpoint of electrical conduction and heat conduction.

  As shown in FIG. 3, the first heat sink 23 includes a first heat sink base 24 formed on an arc belt-like flat plate having a predetermined thickness and a predetermined radial width, and a back surface of the first heat sink base 24. A plurality of radiating fins 25 erected radially at a predetermined pitch in the circumferential direction and extending in the axial direction, respectively, and radially outward from both circumferential ends and the center of the first heat sink base 24 And is produced by die casting using, for example, an aluminum alloy. Each tongue piece 26 is provided with a through hole 27 for attachment. Further, three pairs of locking pins 28 are erected on the surface between the tongue pieces 26 of the first heat sink base 24 at predetermined intervals in the circumferential direction. The interval between the pair of locking pins 28 is substantially equal to the interval between the insertion holes 40 formed on both sides of the metal base 21b. Then, the positive-side diodes 21 crush the heads of the locking pins 28 inserted through the insertion holes 40, and on the surface between the tongue pieces 26 of the first heat sink base 24, three each in the circumferential direction. It is mounted at a predetermined interval.

  As shown in FIG. 3, the second heat sink 29 has a second heat sink base 30 formed in an arc belt-like flat plate having a predetermined thickness and a predetermined radial width, and is die-cast using, for example, an aluminum alloy. It is produced by. Then, through holes 31 for attachment are formed at three locations at both ends and the center in the circumferential direction of the first heat sink base 30. Further, three pairs of locking pins 32 are erected on the surface between the through holes 31 of the second heat sink base 30 at predetermined intervals in the circumferential direction. The interval between the pair of locking pins 32 is substantially equal to the interval between the insertion holes 41 formed on both sides of the metal base 22b. Then, the negative side diodes 22 crush the heads of the locking pins 32 inserted through the insertion holes 41, and each of the three on the surface between the through holes 31 of the second heat sink base 30 is predetermined in the circumferential direction. Implemented at intervals.

  The inner diameter of the second heat sink base 30 is made larger than the outer diameter of the first heat sink base 24. The first and second heat sinks 23 and 29 are arranged on the outer diameter side of the first heat sink base 24 so that the surfaces of the first and second heat sink bases 24 and 30 are located on the same plane. Assembled and assembled. At this time, the tongue piece 26 extends on the surface of the second heat sink base 30, and the hole center of the through hole 27 coincides with the hole center of the through hole 31 formed in the second heat sink base 30. Further, the negative-side diodes 22 are respectively positioned outward in the radial direction of the positive-side diode 21. Although not shown, an insulating bush is interposed between the tongue piece portion 26 and the second heat sink base 30 to ensure electrical insulation between the first and second heat sinks 23 and 29. .

  As described above, the first and second heat sinks 23 and 29 on which the positive and negative diodes 21 and 22 are mounted have the brush holders with the surfaces of the first and second heat sink bases 24 and 30 facing the rotor 16. 9 surrounds the slip ring 7 and is disposed in the rear bracket 3 coaxially with the rotary shaft 19. At this time, both surfaces of the first and second heat sink bases 24 and 30 are located on the same plane orthogonal to the axis of the rotation shaft 19. Further, a circuit board 35 is disposed on the rotor 16 side of the first and second heat sinks 23 and 29. Although not shown in the drawing, the mounting bolt includes a through hole formed in the circuit board 35, a through hole 27 formed in the tongue piece portion 26, and a through hole 31 formed in the second heat sink base 30. And is fastened to the rear bracket 3. As a result, the second heat sink base 30 is electrically connected to the rear bracket 3 and is armed. The lead terminals 21 d and 22 d of the positive and negative diodes 21 and 22 that are opposed to each other in the radial direction are connected to the lead wires 36 of the respective phases of the stator coil 15 via the circuit board 35.

  As shown in FIG. 7, the positive and negative side diodes 21 and 22 include two sets of diodes each including three diode pairs in which a positive side diode 21 and a negative side diode 22 are connected in series by a circuit board 35. The bridges 20A and 20B are connected to form a bridge. The stator coil 15 has a three-phase AC winding 15A made by Y-connecting three windings 15a, 15b, and 15c, and a three-phase made by Y-connecting three windings 15d, 15e, and 15f. An AC winding 15B is configured, and output ends of the windings 15a, 15b, 15c, 15d, 15e, and 15f are connected to a connection point between the positive diode 21 and the negative diode 22 of each diode pair. The three-phase AC voltage output from each output end of the three-phase AC winding 15A is full-wave rectified and output by the diode bridge 20A, and is output from each output end of the three-phase AC winding 15B. The voltage is full-wave rectified by the diode bridge 20B and output.

Here, the support structure of the positive and negative diodes 21 and 22 will be described with reference to FIG.
First, the locking pins 28 and 32 have outer diameters slightly smaller than the inner diameters of the insertion holes 40 and 41 formed on both sides of the metal bases 21b and 22b, and the first and second heat sink bases 24 and 30 are provided. It is erected on the surface. Moreover, the standing height of the locking pins 28 and 32 from the surfaces of the first and second heat sink bases 24 and 30 is higher than the thickness of the metal bases 21b and 22b. These locking pins 28 and 32 are formed at the same time when the first and second heat sinks 23 and 29 are produced by die casting.

  Then, as shown in FIG. 6A, the positive and negative side diodes 21 and 22 are connected to the first and second side diodes 21 and 22 so that the locking pins 28 and 32 are inserted into the insertion holes 40 and 41 of the metal bases 21b and 22b. It is mounted on the surface of the second heat sink base 24,30. Next, the extending portions of the locking pins 28 and 32 from the insertion holes 40 and 41 are crushed. Therefore, the extending portions of the locking pins 28 and 32 are plastically deformed so as to be in close contact with the upper surfaces of the metal bases 21b and 22b, as shown in FIG. Thus, the metal bases 21 b and 22 b are joined to the first and second heat sink bases 24 and 30 by plastically deforming the heads of the pair of locking pins 28 and 32. Therefore, the metal bases 21 b and 22 b are supported by the first and second heat sink bases 24 and 30 while being restricted from moving while maintaining the state of being pressed against the surfaces of the first and second heat sink bases 24 and 30.

  As described above, according to the first embodiment, the first and second heat sink bases 24, 24 are inserted into the insertion holes 40, 41 formed on both sides of the metal bases 21b, 22b exposed from the insulating resin portions 21c, 22c. The positive and negative side diodes 21 and 22 are inserted by inserting the locking pins 28 and 32 erected on 30 and plastically deforming the extending portions of the locking pins 28 and 32 from the insertion holes 40 and 41. The first and second heat sink bases 24 and 30 are attached. Therefore, it is not necessary to raise the metal bases 21b and 22b and the first and second heat sink bases 24 and 30 to a temperature suitable for solder bonding, and the time for attaching the positive and negative diodes 21 and 22 can be shortened.

  Further, since the locking pins 28 and 32 are integrally formed with the first and second heat sinks 23 and 29 by die casting, the locking pins 28 and 32 can be easily manufactured, and the locking pins 28 and 32 are also made. The mechanical strength of can be secured.

  Moreover, since the metal bases 21b and 22b are fixed by crushing the extending portions of the pair of locking pins 28 and 32 from the insertion holes 40 and 41 of the metal bases 21b and 22b, the locking pins 28 and 32 are fixed. The crushing force acts to press the metal bases 21 b and 22 b against the first and second heat sink bases 24 and 30. Therefore, the bottom surfaces of the metal bases 21 b and 22 b are in close contact with the surfaces of the first and second heat sink bases 24 and 30. Further, since the extending portions from the locking pins 28 and 32 through-holes 40 and 41 are plastically deformed, the force for pressing the metal bases 21b and 22b against the first and second heat sink bases 24 and 30 is maintained for a long time. Is done. Therefore, the metal bases 21b and 22b are prevented from coming off and moving, and the metal bases 21b and 22b are kept in close contact with the first and second heat sink bases 24 and 30. Therefore, the positive side and negative side diodes 21 and 22 are prevented from falling off for a long time, and good thermal and electrical connection between the metal bases 21b and 22b and the first and second heat sink bases 24 and 30 is achieved. Connection status is ensured in the long term.

Embodiment 2. FIG.
FIG. 8 is a perspective view showing a positive-side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 2 of the present invention.

  In FIG. 8, a notch 42 as a pin insertion part is recessed in both sides of the metal base 21b exposed from the insulating resin part 21c with a groove width through which the locking pin 28 can be inserted.

Although not shown in the figure, the positive-side diode 21A configured in this way has the locking pin 28 inserted through the notch 42 of the metal base 21b, and the extension portion from the notch 42 of the locking pin 28 is crushed. It is plastically deformed and supported by the first heat sink base 24. The negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21A.
Therefore, the second embodiment also has the same effect as the first embodiment.

Embodiment 3 FIG.
FIG. 9 is a perspective view showing a positive-side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 3 of the present invention.

  In FIG. 9, insertion holes 43 having an elliptical cross section as pin insertion portions are formed on both sides of the metal base 21b exposed from the insulating resin portion 21c.

The positive-side diode 21B configured in this way is not shown, but the locking pin 28 is inserted into the insertion hole 43 of the metal base 21b, and the extension portion of the locking pin 28 from the insertion hole 43 is crushed. It is plastically deformed and supported by the first heat sink base 24. The locking pin 28 erected on the first heat sink base 24 is formed in an elliptical cross section that matches the hole shape of the insertion hole 43. The negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21B.
Therefore, the third embodiment also has the same effect as the first embodiment.

Embodiment 4 FIG.
FIG. 10 is a perspective view showing a positive-side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 4 of the present invention.

  In FIG. 10, two insertion holes 40 are formed on each side of the metal base 21b exposed from the insulating resin portion 21c.

Although not shown in the figure, the positive-side diode 21C configured in this way has the locking pin 28 inserted through the insertion hole 40 of the metal base 21b, and the extension portion of the locking pin 28 from the insertion hole 40 is crushed. It is plastically deformed and supported by the first heat sink base 24. Note that two pairs of locking pins 28 are erected on the first heat sink base 24 so as to match the position of the insertion hole 40 with respect to each of the positive diodes 21C. The negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21C.
Therefore, the third embodiment also has the same effect as the first embodiment.

Embodiment 5 FIG.
FIG. 11 is a perspective view showing a positive-side diode applied to a rectifier mounted on an automotive alternator according to Embodiment 5 of the present invention.

  In FIG. 11, the mounting arm 44 protrudes from the center of both sides of the metal base 21 b, the insertion hole 40 is drilled in the mounting arm 44, and the insulating resin portion 21 c exposes the mounting arm 44. Molded on the metal base 21b.

Although not shown, the positive-side diode 21 </ b> D configured in this way allows the locking pin 28 to be inserted into the insertion hole 40 of the mounting arm 44 and crushes the extending portion of the locking pin 28 from the insertion hole 40. It is plastically deformed and supported by the first heat sink base 24. The negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21D.
Therefore, the fifth embodiment also has the same effect as the first embodiment.

Embodiment 6 FIG.
FIG. 12 is a diagram for explaining a method of attaching the positive-side diode in the rectifier mounted on the vehicle alternator according to Embodiment 6 of the present invention.

  In FIG. 12, the uneven surface 45 is formed in the peripheral part of the insertion hole 40 of the upper surface of the metal base 21b. The uneven surface 45 is formed by a surface treatment such as sandblasting.

  As shown in FIG. 12A, the positive-side diode 21 </ b> E configured as described above has the first heat sink base 24 inserted by inserting the locking pin 28 into the insertion hole 40 formed in the metal base 21 b. Placed on top. Next, the extending portion of the locking pin 28 from the insertion hole 40 is crushed. Therefore, as shown in FIG. 12B, the extending portion of the locking pin 28 is plastically deformed so as to be in close contact with the uneven surface 45 formed in the peripheral portion of the insertion hole 40 on the upper surface of the metal base 21b. To do. Thereby, the metal base 21 b is supported by the first heat sink base 24 while being restricted in movement while maintaining a state where it is pressed against the surface of the first heat sink base 24. The negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21E.

Therefore, the sixth embodiment also has the same effect as the first embodiment.
Further, in the sixth embodiment, since the uneven surface 45 is formed on the peripheral portion of the insertion hole 40, the plastic deformation portion of the locking pin 28 is in close contact with the uneven surface 45, and the bonding strength is increased and the contact is increased. The area increases. Thus, the positive diode 21E is prevented from falling off for a long time, and the thermal and electrical resistance between the metal base 21b and the first heat sink base 24 is reduced.

  Since the negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21E, the negative diode is prevented from falling off for a long time, and the metal base and the second heat sink base are also supported. And the thermal and electrical resistance between them is reduced.

Embodiment 7 FIG.
FIG. 13 is a cross-sectional view showing an attachment state of the positive-side diode in the rectifier mounted on the automotive alternator according to Embodiment 7 of the present invention.

  In FIG. 13, three pairs of rivet insertion holes 46 are formed between the tongue pieces 26 (not shown) of the first heat sink base 24A at predetermined intervals in the circumferential direction. The interval between the pair of rivet insertion holes 46 is substantially equal to the interval between the insertion holes 40 drilled on both sides of the metal base 21b. The insertion hole 40 and the rivet insertion hole 46 are formed in a hole shape through which a cylindrical rivet 47 can be inserted. Here, the insertion hole 40 corresponds to a rivet insertion portion.

  The positive-side diode 21 is joined to the first heat sink base 24A by crushing and plastically deforming both end portions of the rivet 47 inserted through the insertion hole 40 and the rivet insertion hole 46. Accordingly, the metal base 21b is supported by the first heat sink base 24A while being restricted from moving while maintaining the state of being pressed against the surface of the first heat sink base 24A. The negative diode is also supported by the second heat sink base with the same support structure as the positive diode 21.

  Therefore, this seventh embodiment also has the same effect as the first embodiment.

Embodiment 8 FIG.
FIG. 14 is a cross-sectional view showing an attachment state of the positive-side diode in the rectifier mounted on the automotive alternator according to Embodiment 8 of the present invention.

In FIG. 14, a hole 48 having a diameter larger than that of the rivet insertion hole 46 is formed concentrically with the rivet insertion hole 46 on the back surface of the first heat sink base 24A.
Other configurations are the same as those in the seventh embodiment.

Therefore, this eighth embodiment also has the same effect as the seventh embodiment.
Further, in the eighth embodiment, the hole 48 is recessed on the back surface of the first heat sink base 24 </ b> A concentrically with the rivet insertion hole 46, so that the plastic deformation portion of the rivet 47 is accommodated in the hole 48. Therefore, the plastic deformation portion of the rivet 47 does not protrude from the back surface of the first heat sink 24A, and the arrangement of the first heat sink becomes easy.

  The negative side diode is also supported by the second heat sink base with the same support structure as the positive side diode 21, so that the plastic deformation portion of the rivet does not protrude from the back surface of the second heat sink, and the inner wall surface of the rear bracket. Easy to attach to

  In the first to eighth embodiments, the positive electrode side and the negative electrode side diode are supported by the first and second heat sink bases with the same support structure. However, the support structure of the positive electrode side and the negative electrode side diode is not necessarily limited. It doesn't have to be the same. That is, the positive and negative diodes may be supported on the first and second heat sink bases by different support structures selected from the support structures in the first to eighth embodiments.

  In the first to eighth embodiments, the first and second heat sink bases are formed as arc-shaped flat plates having a predetermined thickness and a predetermined radial width. The shape of the heat sink base is not limited to the circular arc-shaped flat plate, and may be, for example, an arc-shaped flat plate having a plurality of corner portions formed by connecting a plurality of trapezoidal flat plates with their hypotenuses.

Embodiment 9 FIG.
FIG. 15 is a longitudinal sectional view showing a vehicle alternator according to Embodiment 9 of the present invention, and FIG. 16 is a perspective view showing a rectifier mounted on the vehicle alternator according to Embodiment 9 of the present invention. It is.

  15 and 16, the rectifier 50 includes a first heat sink 51 on which six positive side diodes 21 are mounted, a second heat sink 29 on which six negative side diodes 22 are mounted, a circuit board 35, Is composed of. The vehicle alternator 101 according to the ninth embodiment is the same as the vehicle alternator 100 according to the first embodiment except that the rectifier 50 is mounted instead of the rectifier 20. It is configured.

  The first heat sink 51 includes a first heat sink base 52 having a predetermined axial length and a predetermined thickness, and a cross section perpendicular to the axial direction formed into a circular arc-shaped cylinder. A plurality of radiating fins 53 erected radially from the inner peripheral surface at an equiangular pitch in the circumferential direction and extending in the axial direction, respectively, both ends in the circumferential direction of one axial end portion of the first heat sink base 52, and And a tongue piece portion 54 extending radially outward from each of the three central portions, and is manufactured by die casting using an aluminum alloy, for example.

  The outer diameter of the first heat sink base 52 is smaller than the inner diameter of the second heat sink base 30. In addition, on the outer peripheral surface of the first heat sink base 52, three attachment surfaces 55 made of a plane orthogonal to the radial direction are formed apart from each other in the circumferential direction between the tongue pieces 54. Further, a pair of locking pins 56 are formed on each mounting surface 55 at intervals substantially equal to the intervals between the insertion holes 40 formed on both sides of the metal base 21b. Furthermore, although not shown, each tongue piece 54 is provided with a through-hole for attachment. The positive diode 21 is attached to each attachment surface 55 of the first heat sink base 52 by crushing the head of the locking pin 56 inserted through the insertion hole 40.

  Here, in order to attach the positive-side diode 21 to the first heat sink base 52, the locking pin 56 is inserted into the insertion hole 40, and the metal base 21 b is placed on the attachment surface 55 of the first heat sink base 52. While pressing the base 21b against the mounting surface 55, the protruding portion of the locking pin 56 from the insertion hole 40 is pressed and crushed toward the metal base 21b. Therefore, the head of the locking pin 56 is plastically deformed so as to be in close contact with the upper surface of the metal base 21 b, and the positive diode 21 is joined to the first heat sink base 52. Accordingly, the positive diode 21 is supported by the first heat sink base 52 while the metal base 21 b is pressed against the mounting surface 55 of the first heat sink base 52 and the movement is restricted.

  Then, the first heat sink 51 faces the one end in the axial direction of the first heat sink base 52 toward the rotor 16, the second heat sink 29 faces the surface of the second heat sink base 30 toward the rotor 16, and the brush holder 9. At the same time, the slip ring 7 is enclosed, and is disposed in the rear bracket 3 coaxially with the rotary shaft 19. Further, a circuit board 35 is disposed on the rotor 16 side of the first and second heat sinks 51 and 29. Although not shown, the mounting bolt is inserted into the circuit board 35, the tongue piece 54, and the through hole formed in the second heat sink base 30 and fastened to the rear bracket 3. As a result, the second heat sink base 30 is electrically connected to the rear bracket 3 and is armed. Then, the lead terminals 21d and 22d of the positive side and negative side diodes 21 and 22 are connected to the lead wires 36 of the respective phases of the stator coil 15 through the circuit board 35, and the circuit shown in FIG. 7 is configured. The

  Also in the ninth embodiment, the positive and negative side diodes 21 and 22 extend from the insertion holes 40 and 41 of the locking pins 56 and 32 erected on the first and second heat sink bases 52 and 30, respectively. By crushing the portion and plastically deforming it, it is supported by the first and second heat sink bases 52 and 30, so the same effect as in the first embodiment can be obtained.

Embodiment 10 FIG.
FIG. 17 is a perspective view showing a rectifier mounted on an automotive alternator according to Embodiment 10 of the present invention, and FIG. 18 is a rectifier mounted on an automotive alternator according to Embodiment 10 of the present invention. It is a perspective view which shows the positive electrode side diode applied to an apparatus.

  17 and 18, the first heat sink 51A has a predetermined axial length and a predetermined thickness, and a first heat sink base 52A having a cross section perpendicular to the axial direction formed in an arcuate cylinder. A plurality of heat radiation fins 53 radiating from the inner peripheral surface of the first heat sink base 52A radially in the circumferential direction and extending in the axial direction, respectively, and one axial end portion of the first heat sink base 52A , And a tongue piece portion 54 extending radially outward from each of the three end portions in the circumferential direction and the center portion, and is manufactured by die casting using, for example, an aluminum alloy. In addition, on the outer peripheral surface of the first heat sink base 52A, three attachment surfaces 55 made of a plane orthogonal to the radial direction are formed apart from each other between the tongue pieces 54 in the circumferential direction. The mounting piece 57 is extended in the axial direction from the other axial end of the first heat sink base 52A so as to be flush with the mounting surface 55 at the center position in the circumferential direction of each mounting surface 55. 56 is erected on each mounting piece 57.

  Further, in the positive diode 21F, the mounting arm 58 projects from the center of one end of the metal base 21b, the insertion hole 40 is drilled in the mounting arm 58, and the insulating resin portion 21c connects the mounting arm 58. The metal base 21b is molded so as to be exposed. The positive diode 21F inserts the locking pin 56 into the insertion hole 40, places the metal base 21b on the mounting surface 55 of the first heat sink base 52A, and presses the metal base 21b against the mounting surface 55. The protruding portion of the locking pin 56 from the insertion hole 40 is crushed and plastically deformed, and is supported on each mounting surface 55 of the first heat sink base 52A.

  Here, the rectifier 50A is configured in the same manner as in the ninth embodiment except that the positive diode 21F and the first heat sink 51A are used instead of the positive diode 21 and the first heat sink 51. .

Therefore, the tenth embodiment also has the same effect as the ninth embodiment.
In the tenth embodiment, the mounting piece 57 on which the locking pin 56 is erected extends in the axial direction from the other axial end of the first heat sink base 52A at the circumferential center position of each mounting surface 55. Thus, the standing position of the locking pin 56 deviates from the installation area of the heat dissipating fins 53. Therefore, the extending portion of the locking pin 56 from the insertion hole 40 can be crushed without interfering with the heat dissipating fins 53, and the heat dissipating fins 53 can be thinned to increase the heat dissipating area.

  Here, in the ninth and tenth embodiments, the head of the locking pin is plastically deformed to join the positive diode on the first heat sink base, but the positive diode is connected to the first heat sink using a rivet. It goes without saying that it may be joined to the base.

In each of the above embodiments, the vehicle alternator has been described. However, the present invention is not limited to the vehicle alternator, and is applied to rotating electric machines such as a vehicle motor and a vehicle generator motor. Produces the same effect.
In each of the above embodiments, the rectifying device is disposed in the rear bracket. However, the rectifying device is attached to the outer end face of the rear bracket and is disposed on the outer side in the axial direction of the rear bracket. May be. In this case, it is preferable to attach the rear cover to the rear bracket so as to cover the rectifier.

In each of the above embodiments, the positive diode is mounted on the first heat sink. However, the negative diode may be mounted on the first heat sink. In this case, the second heat sink on which the positive-side diode is mounted is attached in an electrically insulated state while ensuring a thermal contact state with the rear bracket.
In each of the above embodiments, the first and second heat sinks are arranged coaxially with the rotation axis. However, the first and second heat sinks are not necessarily arranged coaxially with the rotation axis. Instead, it only has to be arranged so as to surround the rotating shaft in cooperation with the brush holder.

  In each of the above embodiments, the positive electrode side and the negative electrode side diode are described as being formed in a substantially rectangular parallelepiped, but the shape of the positive electrode side and the negative electrode side diode is not limited to a substantially rectangular parallelepiped, For example, the insulating resin portions of the positive electrode side and the negative electrode side diode may be columnar, and the metal base may be a disk having a larger diameter than the insulating resin portion.

  In each of the above embodiments, the three-phase AC winding is described as being Y-connected. However, even if the three-phase AC winding is Δ-connected, the same effect can be obtained. In each of the above embodiments, six positive side and negative side diodes are mounted on each of the first and second heat sinks. However, the positive electrode mounted on each of the first and second heat sinks. The number of side and negative side diodes is not limited to six. For example, when the stator coil is composed of a set of three-phase AC windings and the output of the three-phase AC windings is full-wave rectified by a diode bridge, the positive electrodes mounted on the first and second heat sinks, respectively. The number of side and negative side diodes is three. Also, when the stator coil is composed of a set of three-phase AC windings, and in addition to the three output terminals of the three-phase AC windings, the output of the neutral point Y-connected is full-wave rectified with a diode bridge. The number of positive side and negative side diodes mounted on each of the first and second heat sinks is four.

  DESCRIPTION OF SYMBOLS 1 Case, 13 Stator, 14 Stator iron core, 15 Stator coil, 16 Rotor, 19 Rotating shaft, 20, 50, 50A Rectifier 21, 21, 21A, 21B, 21C, 21D, 21E, 21F Positive side diode, 21a Rectifying element, 21b Metal base, 21c Insulating resin part, 22 Negative side diode, 22a Rectifying element, 22b Metal base, 22c Insulating resin part, 23, 51, 51A First heat sink, 24, 24A, 52, 52A 1 heat sink base, 28, 32 locking pin, 29 second heat sink, 30 second heat sink base, 40, 41, 43 insertion hole (pin insertion portion, rivet insertion portion), 42 notch (pin insertion portion, rivet insertion portion) ), 44 mounting arm, 45 uneven surface, 46 rivet insertion hole, 47 rivet, 56 locking pin , 57 mounting pieces, 58 mounting arm.

Claims (5)

A case, a rotor fixed to a rotation shaft supported by the case and disposed in the case, and a stator coil supported by the case so as to cover the outer periphery of the rotor. A stator wound around a stator core, and a rectifier that is electrically connected to the stator coil and rectifies alternating current generated in the stator coil into direct current,
The rectifier includes a heat sink and a plurality of diodes supported on one surface of the heat sink base of the heat sink,
Each of the plurality of diodes has a metal base, a rectifying element bonded on the metal base, and a rectifying element embedded therein, and a part of the outer periphery of the metal base is exposed on the metal base. Having the formed insulating resin part,
A pin insertion part is formed in an exposed part from the insulating resin part of the metal base,
A locking pin is erected on one surface of the heat sink base so that the plurality of diodes can be fixed,
Each of the plurality of diodes is disposed on the heat sink base by inserting the locking pin through the pin insertion portion, and the extension portion of the locking pin from the pin insertion portion is plastically deformed to thereby deform the heat sink. A rotating electrical machine, wherein the rotating electrical machine is supported by being bonded to a base, the bottom of the metal base being in close contact with one surface of the heat sink base, and movement restricted.   2. The rotating electrical machine according to claim 1, wherein the locking pin is integrally formed with the heat sink base by die casting. A case, a rotor fixed to a rotation shaft supported by the case and disposed in the case, and a stator coil supported by the case so as to cover the outer periphery of the rotor. A stator wound around a stator core, and a rectifier that is electrically connected to the stator coil and rectifies alternating current generated in the stator coil into direct current,
The rectifier includes a heat sink and a plurality of diodes supported on one surface of the heat sink base of the heat sink,
Each of the plurality of diodes has a metal base, a rectifying element bonded on the metal base, and a rectifying element embedded therein, and a part of the outer periphery of the metal base is exposed on the metal base. Having the formed insulating resin part,
A rivet insertion part is formed in an exposed part from the insulating resin part of the metal base,
Rivet insertion holes are formed in the heat sink base so as to correspond to the rivet insertion portions of the plurality of diodes,
Each of the plurality of diodes is bonded to the heat sink base by plastically deforming both ends of the rivet insertion portion and the rivet inserted through the rivet insertion hole, and the bottom of the metal base is in close contact with one surface of the heat sink base. A rotating electrical machine characterized by being supported and supported by movement. The heat sink includes a plurality of heat radiation fins erected on the other surface facing one surface of the heat sink base,
The mounting piece protrudes from the heat sink base so as to be flush with one surface of the heat sink base, and the locking pin or the rivet insertion hole is formed in the mounting piece, and the diode is attached to the mounting piece. The rotating electric machine according to any one of claims 1 to 3, wherein the rotating electric machine is joined.   The contact surface of the metal base with the plastic deformation portion of the locking pin, or the contact surface of at least one of the heat sink base and the metal base with the plastic deformation portion of the rivet is formed as an uneven surface. The rotating electrical machine according to any one of claims 1 to 4.

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