JP2841702B2 - AC generator for vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automotive alternator.

[Conventional technology]

2. Description of the Related Art Conventionally, the size of an engine room is reduced in order to enlarge a vehicle interior, and it becomes impossible to secure a cooling air passage of a vehicle AC generator. For this purpose, a structure is adopted in which an air duct for introducing outside cooling air is provided on the rear side of the generator to cool the generator. The cooling air introduction structure of the vehicle alternator will be described with reference to FIGS. 4 and 5. FIG. still,
FIG. 4 is a view of the generator viewed from the rear side, and FIG. 5 is a sectional view taken along line AA of FIG.

An electric component (a rectifier 2, a regulator 3) having a heat radiating portion is disposed on the rear side of the rear frame 1, and a rear cover 4 is provided on the rear side of the electric component. A plurality of openings 5 are provided in the rear cover 4, and the openings 5 extend over a wide range. Then, a gun-shaped cooling air distribution cover 6 is attached to the rear cover 4 so as to cover all the openings 5.
A cooling air introduction duct 7 is attached to the refrigeration unit. Then, the external air cooling air is cooled from the cooling air introduction duct 7 through the cooling air distribution cover 6, and from the opening 5 of the rear cover 4 to the heat radiating portion (rectifin, regulator fin) of the electric component.

[Problems to be solved by the invention]

However, if such a cooling air introduction structure is adopted,
The cooling air distribution cover 6 is required, resulting in an increase in size.

An object of the present invention is to provide a vehicle alternator that can be downsized.

[Means for solving the problem]

According to a first aspect of the present invention, in a vehicle alternator in which a shaft having a rotor is rotatably supported by a housing and an electric component is covered by the housing or the protective cover, a fan that rotates with the rotation of the shaft Is disposed concentrically with the shaft, and is concentric with the shaft in the housing or the protective cover so as to correspond to a suction space inside the blade of the fan so as to introduce cooling air from the outside when the fan rotates. A cooling air passage is arranged in a shape, and the electric component is arranged on an outer peripheral side of the cooling air passage, and a heat radiating portion of the electric component is arranged to extend toward the cooling air passage and is attached to the housing. An opening occupying a part of the protective cover is arranged corresponding to the cooling air passage, and the duct is in contact with the opening of the protective cover. A gist is a vehicle alternator characterized by being connected.

According to a second aspect of the present invention, in the first aspect, the heat radiating portion is provided with a plurality of through holes penetrating in a direction in which the cooling air flows.

According to a third aspect of the present invention, in the second aspect, the through holes are radially arranged in the cooling air passage.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the protective cover is provided with a connecting portion having a size corresponding to only the cooling air passage, and the connecting portion has a size corresponding to the cooling air passage. The gist is that the duct is directly connected.

[Action]

According to the invention of claim 1, when the fan rotates together with the rotation of the shaft, the cooling air passages arranged concentrically are:
Cooling air is introduced from outside through the opening of the duct and the protective cover. The cooling air cools the heat radiating portion because the heat radiating portion of the electric component is arranged to extend to the cooling passage. or,
The cooling air passing through the cooling passage is introduced into a suction space inside the blade of the fan, and cools the inside of the generator.

In this way, the cooling of the electric components is performed by utilizing the intake air of the fan that provides the cooling air for cooling the inside of the generator. Further, since the cooling air passage is formed corresponding to the suction space of the fan, it is possible to prevent the suction of the fan from being hindered.

And since an electric component is arrange | positioned outside a cooling passage and the heat radiating part extended therefrom is arrange | positioned at a cooling passage, the heat of an electric component will be efficiently radiated. Further, since cooling air is introduced through the duct, air suitable for cooling is introduced, and cooling is promoted.

In addition, since the duct is connected to the opening occupying only a part of the protective cover, the cooling air can flow efficiently and there is no need for a special configuration such as distributing the cooling air widely. Even when cooling air is introduced through the fin, the size of the physique is prevented from increasing.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a vehicle alternator of the present embodiment,
FIG. 2 shows this vehicle alternator in the rear direction (B in FIG. 1).
FIG. 3 shows a state in which a rear cover 37 and a recty cover 38 described later in FIG. 2 are removed.

In the vehicle alternator, a cylindrical housing is formed from a front frame 11 and a rear frame 12, and the frame 1
Front and rear bearings 13 are fixedly provided at the center portions of the first and the second bearings. And, by this bearing 3, the shaft
14 is rotatably supported while penetrating the frames 11 and 12. At the front end (left side in FIG. 1) of the shaft 14, a pulley 15 to which rotational force from an engine is applied is fixedly provided.

A stator core 16 is provided on a peripheral surface inside the frames 11 and 12, and a stator coil 17 is wound around the stator core 16. Also, the shaft on the inner peripheral side of the stator core 16
The pole core 19 of the rotor 18 is fixed to 14, and the rotor coil 20 is wound around the pole core 19. Further, a fan 21 having blades arranged concentrically with the shaft 14 is fixed to the rear side surface of the pole core 19.
With the rotation of, the fan 21 can suck air into the suction space inside the blade. At the center of the rear frame 12, a rear bearing box 22 that covers the rear bearing 13 is provided, and around the box 22 in the rear frame 12, openings 23a, 23b are formed. A brush holder 24 containing a brush is provided on the rear side of the rear bearing box 22. The brush holder 24 covers the front end of the shaft 14 on the rear side. The space surrounding the outer periphery of the brush holder 24 forms a cooling air passage communicating with the openings 23a and 23b in the rear frame 12 along the axial direction of the shaft 14.

On the rear side of the rear frame 12, an arc-shaped rectifier 26 as an electric component is fixed by bolts 27 via a resin terminal block 25, and the rectifier 26 is provided with eight diodes 28, The AC current generated from the stator coil 17 is rectified. At the center of the rectifier 26, a rectifier 30 as a heat radiator having a plurality of radially arranged through holes 29 is provided. 14 axial directions). That is, the rectifying fins 30 are connected to the brush holders 24 serving as the cooling air passages.
Of the cooling air passage, and a through hole 29 is located in the cooling air passage and is penetrated in a direction in which the cooling air flows.

A regulator 32 as an electric component is fixed to the rear side of the rear frame 12 via a pedestal 31 made of resin with bolts 33. In this regulator 32, a plurality of transistors for adjusting the exciting current of the rotor coil 20 are sealed in a resin case 35, and a regulator fin 34 as a heat radiation part made of aluminum is connected to the resin case 35.
It is exposed from. The regulator fin 34 has a plurality of radially arranged through holes 36, and the regulator fin 34 has an opening
It is arranged on the rear side of 23a (axial direction of shaft 14). That is, the regulator fins 34 extend toward the outer peripheral space of the brush holder 24, which is the cooling air passage, and in the cooling air passage, the through holes 36 are located and are penetrated in the direction in which the cooling air flows. I have.

Therefore, Rectifin 3 needs ventilation for cooling.
0, the regulator fins 34 and the brush holder 24 are located within the circular area inside the openings 23a and 23b of the rear frame 12.
This means that they are concentrated in the location.

The rear cover 37 as a protective cover is a rectifier
It is arranged on the rear side surface of the rear frame 12 so as to cover 26 and the regulator 32. In addition, a rectifier cover 38 made of resin is interposed between the rear cover 37 and the rectifier 26.

A duct connecting portion 39 as a cylindrical connecting portion is bent outward (rear side) at a central portion (on the axis of the shaft 14) of the rear cover 37. The openings 40 have the same outer peripheral shape as the openings 23a and 23b. Duct connecting part 39 of this rear cover 37
Is connected to a cooling air introduction duct 41, the other end of the duct 41 is opened outside the engine room, and outside air cooling air is sent through the duct 41. As shown in FIG. 2, a connector 42 is provided on a rear side surface of the regulator 32, and the connector 42 is taken out from a portion other than the duct connecting portion 39 of the rear cover 37.

Next, the operation of the thus constructed vehicle alternator will be described.

Rotational force from the engine is pulled by the driving of the engine
It is applied to the shaft 14 via 15 and the rotor 18 rotates. With the rotation of the rotor 18, the fan 21 rotates, and outside air cooling air is introduced from the cooling air introduction duct 41 into the opening 40 of the rear cover 37. This cooling air is rectifin 30,
They hit the regulator fin 34 and the brush holder 24 and cool them. At this time, the outside air cooling air concentrates only on the portion to be cooled (rectifin 30, regulator fin 34, brush holder 24), and can be cooled efficiently.

Thereafter, the outside air is blown by the openings 23a, 23 of the rear frame 12.
b, the rotor 18 and the stator are cooled and the rear frame 12
The air is discharged to the outside from the air discharge port 43 formed at the bottom.

On the other hand, the alternating current generated by the rotation of the rotor 18 becomes a direct current in the diode 28 of the rectifier 26 and is sent from the connector 42 to the battery. Also regulator
At 32, the exciting current of the rotor coil 20 is adjusted.

As described above, in the present embodiment, the fan 21 is arranged concentrically with the shaft 14, and concentrically with the shaft 14 in the rear cover (protective cover) so as to correspond to the suction space inside the blade of the fafan 21. A cooling air passage was arranged.
The rectifier 26 and the regulator 32 (electric component) are arranged on the cooling air passage and the outer peripheral side, and the rectifier 26 and the rectifier 30 and the regulator fin 34 of the regulator 22 (electric component) are connected to the cooling air passage. Rear cover (protective cover) 37
The opening 40 occupying a part of the area is arranged corresponding to the cooling air passage. And the opening of the rear cover 37 (protective cover)
A cooling air introduction duct 41 was connected to 40. As a result, the cooling air can be introduced without providing the cooling air distribution cover 6 shown in FIG. 5, and the size can be reduced.

In the conventional apparatus, a bolt 8 for fixing the cooling air distribution cover 6 to the rear cover 4 and a cooling air distribution cover 6 are provided.
However, these parts are unnecessary, the number of parts can be reduced, and the importance can be reduced.

Further, in the conventional apparatus, when the cooling air introduced by the cooling air introduction duct 7 and the cooling air distribution cover 6 hits the rectifier 2 via the opening 5 of the rear cover 4 and the fin of the regulator 3, Although the flow is parallel to the fins (radial direction with respect to the shaft 14) as shown by F1 in the figure, the flow in the axial direction of the shaft 14 in the present embodiment can reduce the ventilation resistance when passing through the fins. . Further, since the opening 40 of the rear cover 37 is provided at the rotation center of the fan 21 (on the axis of the shaft 14), the air suction force by the fan 21 is strong.

Further, in the conventional apparatus, since the bowl-shaped cooling air distribution cover 6 is provided, it is necessary to devise a way to bring the connector 9 out of the cooling air distribution cover 6 as shown in FIGS. Although it is difficult to attach the connector 9, in this embodiment, since the connector 42 is separated from the duct connecting portion 39 of the rear cover 37, the connector 42 is easily attached.

The present invention is not limited to the above-described embodiment. For example, a guide plate may be provided in the rear cover 37 so that the introduced cooling air efficiently hits the cooling portion.
Further, in a case where a system in which heat of the electric components is released through the rear frame 12 (housing) is adopted, the introduced cooling air may be applied to the rear frame 12.

Further, the cooling air introduction duct attachment opening may be oriented in any direction, and may be taken out from the peripheral surface of the rear cover 37, for example.

Further, in the case where the housing has an electric component, a cooling air introduction duct may be connected to the opening of the housing.

〔The invention's effect〕

As described above in detail, according to the present invention, it is possible to cool the electric components by using the intake air of the fan that provides the cooling air for cooling the inside of the generator.

Further, since the cooling air passage is formed corresponding to the suction space of the fan, it is possible to prevent the fan from being hindered.

Since the electric component is arranged outside the cooling passage and the heat radiating portion extending therefrom is arranged in the cooling passage, the heat of the electric component can be efficiently radiated. Further, since cooling air is introduced through the duct, air suitable for cooling is introduced, and cooling can be promoted.

In addition, since the duct is connected to the opening that occupies only a part of the protective cover, it is possible to efficiently flow the cooling air, and there is no need for a special configuration such as distributing the cooling air widely. In addition, even when cooling air is introduced through a duct, it is possible to suppress an increase in the size of the body.

[Brief description of the drawings]

1 is a cross-sectional view of an automotive alternator according to an embodiment, FIG. 2 is a view showing an automotive alternator viewed from a rear side, and FIG. 3 is a state in which a rear cover and a rectee cover in FIG. 2 are removed. FIG. 4 is a cross-sectional view of a conventional vehicular alternator, and FIG. 5 is a cross-sectional view taken along line AA of FIG. 11 is a front frame that constitutes a housing, 12 is a rear frame that constitutes a housing, 26 is a rectifier as an electric component, 30 is a rectifier as a heat radiator, 32 is a regulator as an electric component, and 34 is a radiator as a heat radiator. Regulator fins, 37 is a rear cover as a protective cover, 40 is an opening, and 41 is a cooling air introduction duct.

Claims (4)

(57) [Claims] 1. A vehicular alternator in which a shaft provided with a rotor is rotatably supported by a housing, and an electric component is covered by the housing or a protective cover. In order to introduce cooling air from the outside when the fan rotates, in the housing or the protective cover so as to correspond to the suction space inside the blade of the fan,
A cooling air passage is arranged concentrically with the shaft, the electric component is arranged on an outer peripheral side of the cooling air passage, and a heat radiating portion of the electric component is arranged to extend toward the cooling air passage. An opening occupying a part of the protective cover attached to the housing is arranged corresponding to the cooling air passage, and a duct is connected to the opening of the protective cover. Alternator. 2. The alternator for a vehicle according to claim 1, wherein the heat radiating portion is provided with a plurality of through holes penetrating in a ventilation direction of the cooling air. 3. The alternator according to claim 2, wherein the through holes are radially arranged in the cooling air passage. 4. The protection cover according to claim 1, wherein a connection portion having a size corresponding to only the cooling air passage is provided, and a duct is directly connected to the connection portion. Item 4. The alternator for a vehicle according to any one of items 3.