JPH0646547A - Alternator for vehicle - Google Patents

Abstract

PURPOSE:To obtain an alternator for vehicle having enhanced environment resistance and cooling performance. CONSTITUTION:A rectifying element, a voltage regulator 13, and a brush unit 12 are disposed in a nonventilative chamber on the outside of frames 1, 2 of an alternator for vehicle. Wall of the chamber is constituted of first and second cooling fins 8, 10 arranged through an insulation sheet 9 while grounding one of them. Any one of the first and second cooling fins 8, 10 serves as a support for a voltage regulator 13 and the brush unit 12 while being coupled with the frame 2. A plurality of heat dissipation ribs are provided on the outer surface of the second cooling fin 10 and heat dissipation fins are projecting from the voltage regulator. A cooling air passage is ensured between the outer surface of the cooling fin 10 and the frame 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator, and more particularly to a structure of the alternator capable of improving environment resistance and high cooling performance.

[0002]

2. Description of the Related Art Conventionally, as a technique in such a field,
Some of them are described in JP-A-56-86052. The cooling operation will be described below. FIG. 5: is a figure which shows the whole conventional AC generator for vehicles. As shown in this figure, at the same time as the intake of the wind as shown by arrows a and b, the pulley 1
The suction window 19 opened in the recover 19 by the centrifugal fan 8'disposed on the side of the pole core 6'on the side opposite to 1.
External winds (arrows c and d) are drawn from a and 19b to cool the regulator 17 and the rectifier respectively, and after cooling the regulator 17 and the rectifier, a window 1b ′ opened near the bearing 4 ′ of the frame 1 ′. The cooling air is introduced into the frame while further cooling the bearing 4 ', and further the stator coil 3b is cooled to become the hot air shown by the arrows u'and d', and the hot air a'is discharged from the discharge window 1c 'opened in the frame 1'. Is discharged.

[0003]

However, in the conventional vehicle alternator, since electric components such as a rectifying element and a voltage regulator are cooled by internal ventilation, it is inevitable to blow air inside the electrical components. There was a problem that water would invade the same route, and the cooling fins of the electric parts would become ventilation resistance, leading to a reduction in the overall air flow.

Therefore, in view of the above problems, the present invention aims to secure the environment resistance and the high cooling property by eliminating the ventilation to the inside of the electric component to increase the air volume due to the reduction of the ventilation resistance and to suppress the water inside the electric component. To aim.

[0005]

In order to solve the above problems, the present invention comprises a cooling mechanism for introducing cooling air into the frame from one end side of the frame and discharging the cooling air from the other end side. In the vehicular AC generator, a room is provided in which at least a part of the wall is formed by the cooling fins arranged in the passage of the cooling air, and the cooling air is not introduced, and the electricity arranged in the room is provided. The parts and the cooling fins are thermally connected. The cooling fin includes a first cooling fin thermally and electrically connected to the first commutator, and a second cooling fin thermally and electrically connected to the second commutator.
Cooling fins, and the first and second cooling fins are electrically insulated by an insulating sheet. Further, one of the first cooling fin and the second cooling fin serves as a support for the voltage regulator and the brush device, and is connected to the frame. Further, a plurality of heat radiation ribs are provided on the outer surface of the second cooling fin, and the voltage regulator heat radiation fin is projected. A structure is provided in which a cooling air passage is secured between the outer surface of the second cooling fin and the frame.

[0006]

According to the vehicle alternator of the present invention, by arranging electric parts such as a rectifying element, a voltage adjusting device, a brush device, etc. in a room without ventilation of cooling air, Can be prevented from flooding. A part of the wall of the room is used as a cooling fin, the cooling fin is arranged in the air passage, and the cooling fin and the electric component are thermally connected to cool the electric component. Further, the cooling fins are composed of the first and second cooling fins, and the first and second rectifying elements of the rectifier are electrically connected to each other, and
By electrically insulating the cooling fins via the insulating sheet, it is possible to satisfactorily cool the first and second rectifying elements without short-circuiting. Further, at least one of the first cooling fin and the second cooling fin can also serve as a support for the voltage regulator, the brush device and the like. Further, by connecting one of the cooling fins to the frame, it is possible to reduce the size of the structure. By providing a plurality of heat radiation ribs on the outer surface of the second cooling fin and projecting the voltage regulator heat radiation fin, the efficiency of heat removal can be improved. Ventilation resistance can be reduced by forming a cooling air ventilation passage between the outer surface of the cooling fin and the frame and smoothing the structure of the cooling air ventilation passage.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an entire vehicular AC generator according to an embodiment of the present invention. The main body of the vehicular AC generator shown in the figure comprises a pair of drive frame 1 and rear frame 2 which form the outer shell of the generator, and the opening side thereof is directly joined and fixed by a plurality of bolts. A stator 3 is fixed to the inner circumferences of the pair of frames 1 and 2. The rotor 4 provided in the stator 3 receives power from the outside of the pair of frames via a shaft connected to a pulley 7 that receives a rotational force from the engine, and rotates to generate an electromotive force by electromagnetic induction. The pair of frames 1 and 2
A front bearing 5 and a rear bearing 6 are mounted in the box at the center of the side surface of the device in order to rotatably support the shaft.

The rotor 4 is provided on the opposite side of the outer frame formed by the pair of frames 1 and 2 of the main body from the pulley 7 side.
A brush device 12 for supplying a driving current, a voltage regulator 13 for adjusting an output voltage, and a rectifier to be described later are provided.
Surrounded by the cooling fins 10 and the rear cover 11 of
Further, the rear cover 2 is positioned on the rear frame 2 by the spigot portion 23, and after the rear cover 11 is assembled, it is tightened and fixed by the bolt 14. The rear cover 11 is provided with a water draining hole 22 below when mounted on a vehicle.

FIG. 2 is a view of the vehicle AC generator of FIG. 1 seen from the rear side, and FIG. 3 is a view showing a cross section taken along the line AA of FIG. As shown in FIG. 2, the rectifier is a positive side rectifying element 15
And the negative side rectifying element 16, the positive side rectifying element 15 and the negative side rectifying element 16 are provided on the rectifier terminal block 17, as shown in FIG. The rectifier terminal block 17 is provided on the first cooling fin 8, and the second cooling fin 10 is provided adjacent to the first cooling fin 8 via an insulating sheet 9 having good thermal conductivity and is grounded. It Unlike the conventional case, the first cooling fin 8, the insulating sheet 9, the second cooling fin 10, and the rear cover 11 are not provided with cooling windows, so that the rectifying elements 15 and 16, the voltage regulator 13, and the brush device 12 are There is no ventilation of cooling air, that is, it is placed in a room with a closed structure. The output terminal 24 of the generator is press-fitted into the first cooling fin 8. Further, one of the first cooling fin 8 and the second cooling fin 10 has a voltage regulator 1
3, which is a support for the brush device 12. And second
The cooling fin 10 is connected to the rear of the rear bearing 6 of the generator main body by a spigot portion 23, and an air passage is secured between the cooling fin 10 and the main body.

FIG. 4 is a view showing the structure of the outer surface of the second cooling fin. As shown in the figure, on the outer surface of the second cooling fin, a second rib composed of a plurality of protruding ribs for heat dissipation is formed.
Cooling fin radiating ribs 18, two stator lead drawing holes 19, a plurality of bolt holes 20 through which the bolts 14 penetrate, and a voltage regulator radiating fin extraction hole 21.
A shaft slip ring hole 25 and a protruding voltage regulator heat radiation fin 26 are provided.

Next, the cooling action according to this embodiment will be described. With the above configuration, the heat generated by the positive side rectifying element 15 is transmitted to the first cooling fin, passes through the insulating sheet 9, and then the second side.
Is transmitted to the cooling fin 10. In addition, the negative side rectifying element 16
The heat generated in (2) is transferred to the second cooling fin 10. Therefore, when the cooling airflow flows through the ventilation passage provided between the second cooling fin 10 and the generator main body, the voltage regulator heat radiation fin protruding to the outer surfaces of the second cooling fin 10 and the second cooling fin. 26 is cooled to suppress the temperature rise of each heating element. In addition, compared to the conventional structure, since there is no ventilation inside the electrical parts, it is possible to obtain high cooling performance by increasing the air volume due to the reduction of ventilation resistance, and improving the environmental resistance by suppressing water exposure inside the electrical parts. Can be expected.

The cooling air a that has entered through the window opened near the rear bearing 6 of the rear frame 2 shown in FIG. 1 cools the rear bearing 6 and is further introduced into the frame to cool the stator 3 and cool the rear frame. Hot air is discharged from the window opened in 2 and discharged to the outside. The wind breeze sucked from the outside through the window opened near the front bearing 5 of the drive frame 1 on the pulley 7 side cools the front bearing 5, then cools the stator 3 and is discharged as hot air c to the outside. . A part of this inhaled wind is pushed toward the rotor 4 from between the claws of the pole core as shown by the arrow to cool the rotor 4, subsequently cools the stator 3, and is discharged as hot air b from the window. .

[0013]

As described above, according to the present invention, by arranging electric parts such as a rectifying element, a voltage adjusting device, a brush device, etc. in a room where the cooling air is not ventilated, the infiltration of water from the ventilation path is prevented. It can be prevented. A part of the wall of the room is used as a cooling fin, the cooling fin is arranged in the air passage, and the cooling fin and the electric component are thermally connected to cool the electric component. In addition, the cooling fin is the first,
A second cooling fin is used, the first and second rectifying elements of the rectifier are electrically connected to each other, and the first and second cooling fins are electrically insulated via an insulating sheet. ,
The first and second rectifying elements can be satisfactorily cooled without being short-circuited. Further, at least one of the first cooling fin and the second cooling fin can also serve as a support for the voltage regulator, the brush device and the like. Further, by connecting one of the cooling fins to the frame, it is possible to reduce the size of the structure. By providing a plurality of heat radiation ribs on the outer surface of the second cooling fin and projecting the voltage regulator heat radiation fin, the efficiency of heat removal can be improved. Ventilation resistance can be reduced by forming a cooling air ventilation passage between the outer surface of the cooling fin and the frame and smoothing the structure of the cooling air ventilation passage.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire vehicular AC generator according to an embodiment of the present invention.

FIG. 2 is a view of the vehicular AC generator of FIG. 1 viewed from the rear side.

FIG. 3 is a diagram showing a cross section taken along the line AA of FIG.

FIG. 4 is a diagram showing a structure of an outer surface of a second cooling fin.

FIG. 5 is a cross-sectional view showing an entire conventional vehicle alternator.

[Explanation of Codes] 1, 2 ... Frame 3 ... Stator 4 ... Rotor 8 ... First Cooling Fin 9 ... Insulating Sheet 10 ... Second Cooling Fin 11 ... Rear Cover 12 ... Brush Device 13 ... Electric Regulator 15 ... Positive Side Rectifying element 16 ... Negative side rectifying element 17 ... Terminal block

Claims (6)

[Claims] 1. An automotive alternator having a cooling mechanism that introduces cooling air into the frame from one end side of the frame and discharges the cooling air from the other end side of the frame. A cooling fin is formed, at least a part of the wall is formed, and a room in which the cooling air is not introduced is provided, and electrical parts arranged in the room are thermally connected to the cooling fin. In-vehicle AC generator. 2. The cooling fin includes a first cooling fin thermally and electrically connected to the first commutator and a second cooling fin thermally and electrically connected to the second commutator. 2. The on-vehicle AC generator according to claim 1, wherein the AC generator comprises two cooling fins, and the first and second cooling fins are electrically insulated by an insulating sheet. 3. The vehicle alternator according to claim 1, wherein one of the first cooling fin and the second cooling fin serves as a support for the voltage regulator and the brush device. 4. The vehicle alternator according to claim 1, wherein one of the first cooling fin and the second cooling fin is connected to the frame. 5. The vehicle alternator according to claim 1, wherein a plurality of heat radiation ribs are provided on an outer surface of the second cooling fin, and the voltage regulator heat radiation fin is projected. 6. A vehicle AC generator having a structure in which a cooling air passage is secured between the outer surface of the second cooling fin and the frame.