JP3675048B2 - Vehicle alternator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular AC generator mounted on an automobile or the like, and more particularly to a vehicular AC generator with improved cooling efficiency of a built-in rectifier.
[0002]
[Prior art]
The vehicle alternator performs auxiliary battery charging while the vehicle is running and covers the power for engine ignition, lighting, and other electrical components. It is compact in order to maintain or improve market competitiveness. Weight reduction, high output and cost reduction are important issues. Among these problems, as one of means for achieving reduction in size and weight and cost reduction, there is known a method of changing the material of the heat sink of the rectifier built in the vehicle alternator from copper to aluminum. Yes. However, since aluminum has a higher electrical resistance and lower heat transfer coefficient than copper, changing the heat sink from copper to aluminum while maintaining the conventional shape may cause a temperature rise. Need to be reduced.
[0003]
In recent years, the trend of electrical load on vehicles has been increasing year by year due to the upgrading of vehicles, and there has been a demand for higher output of vehicle AC generators. Since it leads to a temperature rise, it is necessary to reduce the temperature of the heat sink not only when the heat sink is formed of aluminum but also when it is formed of copper.
[0004]
As a conventional technique for reducing the temperature of the heat sink of the rectifier, there is a rectifier described in Japanese Patent Laid-Open No. 1-99460. In this rectifier, by providing a cut-and-raised portion opened on the lead side of the rectifying element in a part of the heat radiating plate, the lead protruding on the back side of the heat radiating plate is directly cooled by cooling air. As another conventional technique, there is a rectifying device described in German Patent No. 2942693. In this rectifier, the surface area by bending the outer peripheral portion of the fan-shaped heat radiating plate in the rotation axis direction is increased, and cooling air is introduced to the rectifier element side by providing notches at several corners. As another conventional technique, there is a rectifier described in US Pat. No. 4,701,828. This rectifying device cuts a part of the heat sink along the outer periphery of the rectifying element and presses the cut and raised surface against the rectifying element, and passes through the through hole generated by partially cutting the heat sink. Cooling air is introduced.
[0005]
[Problems to be solved by the invention]
By the way, the rectifier described in the above-mentioned Japanese Patent Laid-Open No. 1-99460 directly cools the leads of the rectifier element. However, since the surface area of the leads themselves is small, the cooling efficiency may not increase so much. In addition, a cut-and-raised part is provided in the vicinity of the rectifying element. The fan of the vehicle alternator shown in FIG. In this case, since most of the cooling air flows in the direction of the rotation axis, there is a fear that the cooling efficiency is not increased because the cooling air is not sufficiently applied to the leads.
[0006]
Further, the rectifier described in the above-mentioned German Patent No. 2942693 can introduce cooling air to the back side of the heat sink by several cutouts provided at the outer peripheral corners of the heat sink. As can be seen from FIG. 1 and FIG. 3, since the plurality of notches are only arranged at appropriate intervals, the rectifying element having the highest temperature may not be efficiently cooled.
[0007]
The rectifier described in U.S. Pat. No. 4,701,828 cools the cut surface first by the cooling air introduced through the through hole formed by cutting and raising the heat sink, so that the temperature is the highest. There is a possibility that the cooling efficiency may be reduced as compared with the case of directly cooling a high rectifying element.
[0008]
The present invention was created in view of the above points, and an object of the present invention is to provide an automotive alternator that can improve the cooling efficiency of the rectifier by directly cooling the rectifier. is there.
[0009]
[Means for Solving the Problems]
In the present invention, only one or a plurality of through-holes that are open to the flow of cooling air are formed at positions where the rectifying elements of the heat radiating plate of the rectifying device are attached so as to substantially contact the outer periphery of the rectifying elements. Because part of the cooling air sucked from the AC generator suction window toward the rectifier directly hits the rectifier body attached to the back of the heat sink by soldering, etc., the rectifier that is the heat source is more efficient Can cool well.
[0010]
In particular, when a frustoconical convex portion for attaching a rectifying element to a heat sink is provided and a through hole is formed at an inclined position on its side surface, the through hole and the rectifying element body are close to each other, so a part of the cooling air Can be directly applied to the rectifying element body.
[0011]
Moreover, in the various rectifiers described above, a metal plate may be interposed between the heat radiating plate and the rectifier element so that the metal plate faces the through hole.
For example, when the material of the heat sink is aluminum, a copper plate may be attached to the surface of the heat sink, and a rectifying element may be soldered to the surface. If it is allowed to face, the copper plate closer to the rectifying element that is the heat source than the heat sink is cooled, so that the temperature of the entire rectifying device can be reduced. The same effect can be obtained when the above-described metal plate is interposed with copper as the material of the heat sink.
Furthermore, the metal plate has a shape in which the outer diameter portion corresponding to the through hole is extended outward, and when this extended portion protrudes into the ventilation path of the cooling air, the cooling efficiency can be further increased.
[0012]
In addition to simply forming the through-hole, by tilting the outer edge of the through-hole and away from the rectifying element toward the rectifying element toward the downstream of the cooling air passing through the through-hole, The flow of the cooling air flowing in a direction substantially perpendicular to the heat sink can be partially directed to the rectifying device body. Alternatively, it is possible to increase the amount of cooling air flowing to the rectifying element side by forming a protruding partition on the outer periphery of the through hole and away from the rectifying element to increase the opening area. As a result, it is possible to efficiently cool the rectifier element body, which has a higher temperature than the heat sink.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The vehicle alternator of the present invention (hereinafter referred to as “alternator”) is characterized in that the cooling performance is improved by devising the shape of the rectifier as a rectifier. Hereinafter, an alternator according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a partial cross-sectional view showing the overall structure of the alternator according to the present embodiment. As an example, the structure of an alternator incorporating a cooling fan is shown. An alternator 1 shown in the figure includes a rotor 2, a stator 3, a brush device 4, a rectifier 5, an IC regulator 6, a drive frame 7, a rear frame 8, a pulley 9, and the like.
[0015]
The rotor 2 is a rotor of the alternator 1 that is a synchronous generator, and a rotor coil 21 in which an insulated copper wire is wound in a cylindrical and concentric manner, a pole core 22 each having six claws, 23 has a structure sandwiched from both sides through a shaft 24 which is a rotating shaft. An axial flow type cooling fan 25 is attached and fixed to the end face of the pole core 22 on the front side (pulley 9 side) by welding or the like in order to discharge the cooling air sucked from the front side in the axial direction and the radial direction. . Similarly, a centrifugal cooling fan 26 is attached and fixed to the end face of the pole core 23 on the rear side by welding or the like in order to discharge the cooling air sucked from the rear side in the radial direction. Further, slip rings 27 and 28 electrically connected to both ends of the rotor coil 21 are formed on the rear side of the shaft 24, and the brushes 41 and 42 in the brush device 4 are respectively connected to the slip rings 27 and 28. When assembled in a pressed state, an exciting current flows from the rectifier 5 to the rotor coil 21.
[0016]
The stator 3 is a stator of the alternator 1, and three-phase stator coils 32 are wound around a plurality of (for example, 36) slots formed in the stator core 31 at predetermined intervals.
[0017]
The rectifier 5 is for rectifying the three-phase alternating current, which is the output voltage of the three-phase stator coil 32, to obtain a direct current output. The rectifier 5 is fixed to the terminal block 51 including the wiring electrode inside at a predetermined interval. And a plurality of rectifying elements 54 and 55 attached to the respective heat sinks by soldering. Details of the rectifier 5 will be described later.
[0018]
The IC regulator 6 controls the excitation current that flows through the rotor coil 21. When the load is light and the output voltage is high, the output voltage of the alternator 1 is interrupted by intermittently applying the voltage to the rotor coil 21. Is kept constant. The pulley 9 is for transmitting the rotation of the engine (not shown) to the rotor 2 in the alternator 1 and is fastened and fixed to one end of the shaft 24 (on the side opposite to the slip ring 27 etc.) by a nut 91. . A rear cover 92 is attached so as to cover the brush device 4, the rectifier 5 and the IC regulator 6.
[0019]
In the alternator 1 having the above-described structure, when the rotation from the engine is transmitted to the pulley 9 via a belt or the like, the rotor 2 rotates in a predetermined direction. By applying an excitation voltage to the rotor coil 21 from the outside, the respective claws of the pole cores 22 and 23 are excited, and a three-phase AC voltage can be generated in the stator coil 32. A predetermined value is output from the output terminal of the rectifier 5 Output current is taken out. Thereafter, since the output voltage of the alternator 1 itself is applied to the rotor coil 21 via the IC regulator 6, the excitation voltage applied from the outside becomes unnecessary.
[0020]
Further, the cooling fan 25 attached to the end face of the pole core 22 rotates with the rotation of the rotor 2 described above, so that the cooling air is sucked into the alternator 1 through the suction window near the pulley 9 of the drive frame 7. The rotor coil 21 is cooled by the axial component of the cooling air, and the pulley-side half of the stator coil 32 is cooled by the radial component. Similarly, since the cooling fan 26 attached to the end face of the pole core 23 also rotates, the cooling air sucked through the suction window of the rear cover 92 cools the rectifier 5 or the IC regulator 6 and then the vicinity of the cooling fan 26. The cooling air is discharged in the radial direction, and the rear half of the stator coil 32 is cooled.
[0021]
FIG. 2 is a plan view showing the detailed shape of the rectifier 5 described above. FIG. 3 is a partially enlarged sectional view of the alternator 1 including the rectifier 5, and shows a sectional structure in the vicinity of the rear cover 92 and the rectifier 5 shown in FIG. As shown in these drawings, the rectifier 5 includes a positive-side heat radiating plate 52 and a negative-side heat radiating plate 53 having a predetermined interval in the rotation axis direction and having an arc shape partially overlapping each other in the radial direction. ing. The outer diameter of the positive-side heat radiating plate 52 is set to be larger than the outer diameter of the negative-electrode-side heat radiating plate 53, and a part of the air introduced through the suction window of the rear cover 92 passes through the negative-side radiating plate 53 and then In addition to being led to the side heat radiating plate 52, it is led directly to the positive side heat radiating plate 52 without going through the negative side heat radiating plate 53. Further, an output terminal 69 for taking out the output of the alternator 1 to the outside is attached and fixed to a part of the positive-side heat radiating plate 52 by press fitting or the like.
[0022]
The positive-side heat radiating plate 52 has four embossed portions 56 in which rectifying elements 54 are soldered to the concave portions. Similarly, the negative-side heat sink 53 has four embossed portions 57 to which the rectifying elements 55 are soldered in the recesses on the back side. For example, each of the heat dissipation plates 52 and 53 is formed into a predetermined outer shape by pressing an aluminum plate having a predetermined thickness, and each embossed portion 56 and 57 is formed by extruding a part thereof. Is done. Although the number of the embossed portions 56 and 57 formed on each of the heat sinks 52 and 53 is four, when the three-phase alternating current generated in the stator coil 32 is rectified, the three rectifying elements 54 and 55 are respectively provided. Therefore, the number of embossed portions 56 and 57 may be set to three.
[0023]
FIG. 4 is a diagram showing a detailed shape of any one of the embossed portions 57 extracted. FIG. 4A is a plan view of the embossed portion 57, and FIG. 4B is a sectional view taken along line IV-IV. The embossed portion 56 has the same detailed shape, and the embossed portion 57 will be described as a representative.
[0024]
The embossed portion 57 is formed as a frustoconical convex portion, and four through holes 59 serving as vent holes are formed at inclined positions on the side surfaces thereof. Each through hole 59 is formed, for example, by punching with a press device when the embossed portion 57 is pushed out. Or you may form the through-hole 59 by cutting.
[0025]
A rectifying element 55 is attached to the flat surface of the back-side recess of the embossed portion 57 with a copper plate 61 that is a metal plate interposed therebetween. In general, since it is not easy to solder the case 55a of the rectifying element 55 made of copper to the heat radiating plate 53 that is an aluminum plate, in this embodiment, the copper plate 61 is ultrasonically welded to the surface of the heat radiating plate 53. The case 55a of the rectifying element 55 is soldered to the surface. In this way, by soldering the rectifying element 55 with the copper plate 61 sandwiched between the flat surface on the back side of the embossed portion 57, the rectifying element 55 and the heat dissipation plate 53 are in good electrical contact, and the rectifying element 55 is in good contact. The heat generated in step 1 is efficiently transmitted to the heat radiating plate 53 through the copper plate 61.
[0026]
Further, as described above, each of the four through holes 59 is formed so as to penetrate a part of the inclined surface of the embossed portion 57, so that the cooling air W introduced through the suction window of the rear cover 92 is 3 and 4B, a part flows through the through hole 59 to the back side of the heat radiating plate 53, and a part flows along the surface of the heat radiating plate 53. Therefore, the heat radiating plate 53 itself is cooled by the cooling air W flowing along the surface of the heat radiating plate 53, and the rectifying element 55 is directly cooled by the cooling air W flowing to the back side.
[0027]
Since the case 55a and the lead 55b of the rectifying element 55 are generally formed of copper having a small electric resistance and have a high thermal conductivity, if the rectifying element 55, which is one of the heat sources, can be directly cooled, It can be cooled efficiently. In particular, as shown in FIG. 4B, when the outer diameter of the flat surface on the back side of the embossed portion 57 and the outer diameter of the case 55a of the rectifying element 55 are set to be approximately the same size, the case 55a And the through-hole 59 are in a very close positional relationship, so that the case 55 a that is at a high temperature can be efficiently cooled by the cooling air W introduced through the through-hole 59.
[0028]
In addition, the rectifier 5 may be painted for the purpose of preventing corrosion, but the rectifier 5 of the present embodiment is provided with a plurality of through holes 58 and 59 in the embossed portions 56 and 57. The coating easily turns to the back side (the side on which the rectifying elements 54 and 55 are attached) of the heat radiating plates 52 and 53 of the fire 5, and the occurrence of uneven coating can be prevented. In particular, when powder coating is performed on a conventional rectifier, since the powder coating has lower fluidity than liquid coating, the rectifying element 55 has a copper plate 61 sandwiched between the embossed portion 57 as shown in FIG. In the case of soldering, it is not easy to sufficiently infiltrate the coating powder up to the gap portion in the vicinity of the outer periphery of the copper plate 61, but the through hole 59 is provided in the vicinity of the outer periphery of the copper plate 61 as in this embodiment. If it forms, since it will become easy for a powder to wrap around in this part, generation | occurrence | production of coating unevenness can be suppressed.
[0029]
Further, as can be seen from the cross-sectional structure of the rectifier 5 shown in FIG. 3, the rectifier 5 has a complicated shape. However, in this embodiment, since the through holes 58 and 59 are formed at positions close to the rectifying elements 54 and 55, there is an effect of preventing such various liquids from staying. .
[0030]
FIG. 5 is a diagram illustrating a modification of the above-described embodiment. FIG. 4A is a plan view in which any one of the embossed portions 57 is extracted, and FIG. 4B is a cross-sectional view taken along the line V-V. Compared with the structure in the vicinity of the embossed portion 57 shown in FIG. 4, the difference is that the shape of the copper plate 61 is replaced with a copper plate 62 partially changed. That is, the copper plate 61 shown in FIG. 4 has a circular shape having substantially the same outer diameter as the case 55a of the rectifying element 55, and is used for the purpose of facilitating soldering of the rectifying element 55. On the other hand, the copper plate 62 shown in FIG. 5 has a shape in which an outer diameter portion corresponding to the through hole 59 is extended to the outside, facilitating soldering of the rectifying element 55 and cooling air W By projecting this extended portion into the ventilation path, the cooling efficiency can be further increased. More specifically, the copper plate 62 has a circular joining portion 62a that is slightly smaller than the flat surface on the back side recess of the embossed portion 57 and slightly larger than the bottom surface of the case 55a of the rectifying element 55, and four sides from the joining portion. And four arm portions 62b that directly face the through hole 59. Moreover, these arm portions 62 b are positioned on the axial direction of the through hole 59 so that they can be directly seen through the through hole 59.
[0031]
In particular, the copper plate 62 close to the rectifying element 55 that is a heat source has a higher temperature than the heat radiating plate 53, so that the temperature difference from the cooling air W increases and the heat dissipation amount also increases. Further, as shown in FIG. 5 (B), the copper plate 62 can be protruded into the through hole 59 simply by extending the outer diameter portion, so that the cooling efficiency of the copper plate 62 can be increased, and the copper plate 61 When the is replaced with the copper plate 62, it is only necessary to change the shape of the punching die, and an increase in manufacturing cost can be minimized.
[0032]
FIG. 6 is a view showing a modified example of the through hole provided on the inclined surface of the embossed portion, and a case where a part of the heat radiating plate 53 punched out in the above example is used as a guide plate for introducing the cooling air W. It is shown. FIG. 6A is a plan view in which any one of the embossed portions 57 is extracted, and FIG. 6B is a sectional view taken along the line VI-VI. As shown in FIG. 4B, the edge of the through hole 59 on the side away from the rectifying element 55 is inclined so as to approach the rectifying element 55 toward the downstream of the flow of the cooling air W passing through the through hole 59. Thus, the inclined portion is used as the guide plate 65 for the cooling air W, and the flow of the cooling air W passing through the through hole 59 can be positively directed to the case 55a and the lead 55b of the rectifying element 55. In particular, in the structure shown in FIG. 4, a part of the heat radiating plate 53 is removed by punching or cutting to form the through hole 59, but in the structure shown in FIG. 6, a part of the heat radiating plate 53 is not removed. The guide plate 65 is formed by bending along one side of the outer peripheral side of the through-hole 59 and tilting it to the back side of the heat radiating plate 53 (the side to which the rectifying element 55 is attached). Efficient cooling can be realized.
[0033]
FIG. 7 is a diagram in which the shape around the embossed portion shown in FIG. 6 is further modified. In FIG. 7A, any one planar shape of the embossed portion 57 is shown, and in FIG. A cross-section taken along line -VII is shown. The structure of the embossed portion 57 shown in FIG. 6 is the same as that of the embossed portion 57 shown in FIG. 6 except that a part of the heat radiating plate 53 is bent to function as the guide plate 65 for introducing the cooling air W. Extrusion molding by press is performed on the outer periphery of 59 to form a protruding partition 63 along the arc-shaped outer periphery. For example, the partition part 63 is formed in a convex shape by pressing and deforming a part of the heat radiating plate 53 on the outer peripheral side by extrusion molding with a press to cause a change in thickness. A part of the cooling air W flowing on the surface of the heat radiating plate 53 is taken into the through hole 59 by the partition 63, and the opening area for introducing the cooling air W to the rectifying element 55 side can be substantially enlarged. it can.
[0034]
FIG. 8 is a view showing another modified example in which the opening area for introducing the cooling air W is enlarged. In FIG. 8A, any one planar shape of the embossed portion 57 is shown in FIG. VIII-VIII line cross section is shown. In the structure shown in FIG. 6, the guide plate 65 is formed by simply inclining the edge of the through-hole 59 on the side away from the rectifying element 55, but in the structure shown in FIG. By cutting up the outer side of the connecting portion 67 formed at the edge of the through hole 59 on the side away from the rectifying element 55 and at the position where the inclined surface of the embossed portion 57 and the heat radiating plate 53 intersect, A guide plate 66 having a large diameter is formed. Further, the rectifying element 55 side of the guide plate 66 on the inner side of the connecting portion 67 is directed toward the rectifying element 55 toward the downstream side of the flow of the cooling air W passing through the through hole 59, similarly to the guide plate 65 shown in FIG. Inclined to approach. Therefore, the flow of the cooling air W passing through the through-hole 59 can be positively directed to the case 55a and the lead 55b of the rectifying element 55, and the cooling air W is moved toward the rectifying element 55 by increasing the diameter of the outer periphery thereof. The opening area for introduction can be substantially enlarged.
[0035]
By expanding the opening area for introducing the cooling air W by the structure shown in FIG. 7 or FIG. 8, the air volume of the cooling air W guided to the back side of the embossed portion 57, that is, the case 55a and the lead 55b of the rectifying element 55. Therefore, the rectifying element 55 having a higher temperature than the heat radiating plate 53 can be efficiently cooled.
[0036]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, although the rectifier 5 described above uses the heat radiating plates 52 and 53 made of aluminum, a heat radiating plate made of copper may be used. However, in this case, the copper plate 61 shown in FIG. 4 or the like is not necessary, and the rectifying element can be directly soldered to the flat portion on the back side of the embossed portion. Further, as an example, the case where four through holes 59 are formed in each embossed portion 57 has been described. However, the number and shape of the through holes 59 take into consideration the temperature of the rectifying element, the material of the heat sink, and the like. May be changed as appropriate.
[0037]
Further, when the heat sink 53 shown in FIG. 4 is formed by pressing an aluminum or copper plate material, the plate material corresponding to the through hole 59 is punched and removed, so that the remaining inclined surface from the punched portion. By causing the thickness to change toward, heat from the rectifying element 55 to the heat radiating plate 53 may be easily transmitted by increasing the thickness of the remaining inclined surface. In particular, when the material is aluminum, the malleability and ductility are good, so that the thickness can be easily changed, and the above-described processing is easy.
[0038]
Further, the cooling fins may be formed by partially extruding the remaining inclined surface having the increased thickness. FIG. 9 is a view showing the structure in the vicinity of the embossed portion 57 in which the cooling fins 64 are formed on the inclined surface. FIG. 9 (A) is a plan view, and FIG. 9 (B) is a sectional view taken along the line IX-IX. Show. As shown in these drawings, a cooling fin is formed from the end portion of the convex flat surface of the embossed portion 57 toward the heat radiating plate 53 by using the thickness that has moved to the adjacent inclined surface when the through hole 59 is formed. By forming 64, the surface area of the heat sink 53 is increased, so that the cooling efficiency can be further increased. In particular, as shown in FIG. 9A, when the cooling fins 64 are formed almost radially from the center of the flat surface of the convex portion of the embossed portion 57, the cooling flowing from the flat surface of the convex portion to the surface of the heat sink 53 is performed. Since the cooling air flowing through the wind and the through-hole to the rectifying element 55 is not blocked, the air volume of the cooling air is not reduced.
[0039]
Further, in the description of the above-described embodiment, in order to facilitate soldering on the assumption that the heat radiating plate 53 and the like are formed using an aluminum plate material, copper is applied to the concave flat surface of the embossed portion 57 of the heat radiating plate 53. The plate 61 is attached and the rectifying element 55 is soldered to the surface thereof. However, when the rectifying element 55 is directly attached to the heat radiating plate 53 or by other methods, or the heat radiating plate 53 is formed of copper. In this case, the copper plate 61 may be removed. Alternatively, the heat dissipation plate 53 may be formed of copper and the copper plate 62 may be added.
[0040]
In the above description of the embodiment, four embossed portions 56 and 57 are formed in each of the heat sinks 52 and 53, and the rectifying elements 54 and 55 are attached to the concave portions by soldering or the like. The present invention can also be applied to a rectifier having a heat sink without the portions 56 and 57, that is, a rectifier in which a rectifying element is attached directly to a heat sink without unevenness or with a copper plate interposed. In this case, one or a plurality of through holes are formed so as to be substantially in contact with the outer periphery of the case of the rectifying element instead of forming a through hole serving as a vent hole on the inclined surface of the embossed portion. Thus, by forming the through hole at a position very close to the rectifying element, the cooling air flowing through the through hole to the back side of the rectifier flows along the case of the rectifying element. The rectifying element can be directly cooled. Further, when the copper plate 62 having the shape shown in FIG. 5 is used, a part of the copper plate 62 is exposed to the through hole, so that the copper plate 62 can be efficiently cooled. When a part of the heat sink is bent or a partition is formed as shown in FIGS. 6 to 8, the direction of the cooling air passing through the through hole can be changed and applied directly to the rectifying element. Alternatively, the air flow can be increased by increasing the opening area.
[0041]
In the above-described embodiment, the inner fan type alternator 1 in which the cooling fan is built in the frame as illustrated in FIG. 1 is described as an example, but the outer fan type alternator in which the cooling fan is attached to the pulley end surface. The present invention can also be applied to.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of an alternator to which the present invention is applied.
FIG. 2 is a plan view showing a detailed shape of a rectifier that is a rectifier.
FIG. 3 is a partially enlarged sectional view of an alternator in the vicinity of a rectifier.
FIG. 4 is a diagram showing a detailed structure of an embossed portion formed in the rectifier.
FIG. 5 is a view showing a modification of the embossed portion formed in the rectifier.
FIG. 6 is a view showing another modification of the embossed portion formed in the rectifier.
FIG. 7 is a view showing another modification of the embossed portion formed in the rectifier.
FIG. 8 is a view showing another modification of the embossed portion formed in the rectifier.
FIG. 9 is a view showing another modification of the embossed portion formed in the rectifier.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Alternator 2 Rotor 3 Stator 4 Brush device 5 Rectifier 51 Terminal block 52, 53 Heat sink 54, 55 Rectifier 56, 57 Embossed part 58, 59 Through-hole 61, 62 Copper plate

Claims (5)

A rectifier comprising: a heat radiating plate attached substantially perpendicular to a flow of cooling air introduced through the suction window; and a rectifying element attached to one surface of the heat radiating plate on the opposite side of the suction window. In the vehicle alternator with built-in
At the position where the rectifying element of the heat radiating plate is attached, only one or a plurality of through holes opened to the flow of the cooling air are provided so as to be substantially in contact with the outer periphery of the rectifying element ,
Wherein forming a protrusion of a truncated cone shape so as to protrude into the suction window side to a position for mounting the rectifying device of the heat radiating plate, alternating vehicle, characterized in Rukoto provided with the through hole in the tilted position of the convex portion side Generator. A rectifier comprising: a heat radiating plate attached substantially perpendicular to a flow of cooling air introduced through the suction window; and a rectifying element attached to one surface of the heat radiating plate on the opposite side of the suction window. In the vehicle alternator with built-in
At the position where the rectifying element of the heat radiating plate is attached, one or a plurality of through holes are provided so as to be substantially in contact with the outer periphery of the rectifying element,
A metal plate is interposed between the heat radiating plate and the rectifying element, and the metal plate is arranged facing the through hole,
The said metal plate has the shape which extended the outer-diameter part corresponding to the said through-hole outside, and this extension part is located on the axial direction of a through-hole, The AC generator for vehicles characterized by the above-mentioned. In claim 2 ,
An AC power generation for vehicles, wherein a convex portion having a truncated cone shape is formed so as to protrude toward the suction window at a position where the rectifying element of the heat radiating plate is attached, and the through hole is provided at an inclined position on a side surface of the convex portion. Machine. A rectifier comprising: a heat radiating plate attached substantially perpendicular to a flow of cooling air introduced through the suction window; and a rectifying element attached to one surface of the heat radiating plate on the opposite side of the suction window. In the vehicle alternator with built-in
At the position where the rectifying element of the heat radiating plate is attached, one or a plurality of through holes are provided so as to be substantially in contact with the outer periphery of the rectifying element,
A frustoconical convex portion is formed so as to protrude to the suction window side at a position where the rectifying element of the heat sink is attached, and the through hole is provided at an inclined position on the side surface of the convex portion,
The flow of the cooling air passing through the through hole is rectified by inclining the edge of the through hole on the side away from the rectifying element toward the downstream of the cooling air flow so as to approach the rectifying element. An AC generator for a vehicle characterized by being directed to an element. In claim 4 ,
An AC generator for vehicles, wherein an opening area of cooling air flowing to the rectifying element side is widened by forming a convex partition on the outer periphery of the through hole on the side away from the rectifying element.

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