JPH06284638A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To provide an AC generator for vehicle in which cooling air can be generated effectively in the axial direction from centrifugal cooling fans without decreasing the flow rate of cooling air in the radial direction of rotor. CONSTITUTION:In an AC generator for vehicle provided with centrifugal cooling fans 13, 14 on the side face of a rotor 10, an axial flow disc 17 is interposed between the rotor 10 and the cooling fans 13, 14 in order to generate cooling air forcibly in the axial direction of the rotor thus feeding the cooling air in the axial direction of the rotor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicle AC generator in which a centrifugal cooling fan is mounted on the side surface of a rotor.

[0002]

2. Description of the Related Art Conventionally, an alternator for a vehicle generally has a structure in which a cooling fan having the same rotation axis as a rotor driven by an automobile engine is provided. Many of the structures have a fan mounted on the side of the rotor.

For example, a conventional AC generator of this type disclosed in Japanese Patent Laid-Open No. 3-70452 will be described with reference to FIGS. 4 to 8. FIG. 4 shows a rotor 10 of the AC generator 1, which includes two pole cores 11 and 12 and a front fan 1.
3, a rear fan 14, and a rotary shaft 15 that integrates them. The pole core 11 is formed of low carbon steel, and as shown in FIG. 5, six convex portions 11b are formed around the columnar portion 11a so as to divide the periphery into six equal parts, and the outer periphery of each convex portion 11b. Claw portions 11c bent in the axial direction of the rotary shaft 15 are respectively provided from the ends, and the outer peripheral end of each convex portion 11b serves as a shoulder portion 11d for the claw portion 11c.

As shown in FIG. 6, the front fan 13 has a hollow metal disk-shaped collar 13a at its center, and six molded parts 13c on one surface of a molded disk-shaped base 13b. Six fan parts 13d on the other side
Are provided at a constant height with respect to the base 13b. On the other hand, the rear fan 14 is the front fan 13
Similarly, as shown in FIG. 7, a metal collar 14 is attached to the center.
a is a molded disk-shaped base 14b having a flesh-on portion 14c on one surface and a fan portion 14d on the other surface.
Are provided at a constant height with respect to the base 14b.

As shown in FIG. 4, the rotor 10 having the above-described structure includes the claw portions 11c, 1 of the pole cores 11, 12, respectively.
2c are arranged so as to face each other between the claw portions 12c, 11c and are fixed to the rotating shaft 15, and the field coil 10a is wound around the outer periphery of the cylindrical portion via an insulating bobbin. Further, the rotary shaft 15 is inserted into the collars 13a and 14a of the front fan 13 and the rear fan 14, and at this time, the respective flesh portions 13c and 14c are appropriately contacted with the convex portions 11b and 12b of the pole cores 11 and 12, respectively. Position and position each collar 13a, 14a on the rotating shaft 15
Press into.

Further, a plurality of driving rivets 16 are provided on the base 13 of the front fan 13 and the rear fan 14.
b and 14b through the small holes 13g and 14g respectively formed in the pole cores 11 and 12, respectively.
And then press-fitted, and the fans 13 and 14 are fixed. By assembling the rotor 10 as described above, the substantial widths between the convex portions 11b of the pole cores 11 and 12 and between the convex portions 12b become non-uniform and different from each other.

The rear bearing 2 and the two slip rings 3 are fitted to the outside of the rotor 10 having the above-described structure, and the rotary shaft 15 is fitted to the front bearing 4 as shown in FIG. The child 10 is provided inside the stator core 6 arranged in the frame 5 including the front frame 5a and the rear frame 5b.
1, 12 are provided inside the stator coil 7 for the respective fans 13, 1
Four fan portions 13d and 14d are arranged so as to be located respectively, and the rotary shaft 15 is fixed to the frame 5 via the front bearing 4 and the rear bearing 2.

[0008] The V which is hung on the pulley 8 fixed to the tip of the rotary shaft 15 protruding to the outside of the front frame 5a.
When the rotational force of the vehicle engine is transmitted by the belt to rotate the rotating shaft 15 of the AC generator 1 and at the same time a field current is applied from the brush 9 that contacts the outer peripheral surface of the slip ring 3, the pole cores 11 and 12 are rotated. Form a rotating field, which produces an alternating voltage in the stator coil 7.

Further, in the front fan 13, the air guided by the fan portion 13d as it rotates is changed to the ventilation port 1
3f, and the fan surface 13e of the flesh part 13c
Since it is guided inside the pole core 11, the field coil 10a can be cooled and the temperature rise due to heat generation of the coil can be suppressed.

[0010]

In the conventional vehicle alternator of this type, it is generally necessary that the cooling fans 13 and 14 are of a centrifugal type also in terms of structurally cooling the armature coil. Therefore, there is a problem that the cooling air is less likely to travel in the axial direction of the rotor 10 and the cooling of the field coil 10a is deteriorated. Therefore, there is an example in which the blades of the centrifugal cooling fan are tilted at several places to give an axial flow effect, but conversely, there is a problem that the original cooling of the armature coil is deteriorated.

The present invention has been made to solve the above-mentioned problems, and effectively generates axial cooling air without reducing the amount of cooling air in the rotor radial direction by the centrifugal cooling fan. The purpose is to obtain a vehicle alternator that can be used.

[0012]

In a vehicle AC generator according to the present invention, a centrifugal type cooling fan for cooling is provided on a side surface of a rotor, wherein the rotor is provided with a shaft separate from the centrifugal type cooling fan. It is provided with a flowing disk.

[0013]

According to the present invention, the cooling air is generated in the centrifugal direction by the cooling fan, and the cooling air is forcibly generated in the axial direction of the rotor by the axial flow disk.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a sectional view in the axial direction, FIG. 2 is a partial view showing the rotor of FIG. 1 in a plan view, and FIG. 3 is a perspective view showing a mounted state of an axial flow disc, which is the same as or equivalent to the conventional one. Are denoted by the same reference numerals and description thereof will be omitted. In the figure,
Reference numeral 17 is an axial flow disk mounted on each side of the rotor 10 by a front fan 13 and a rear fan 14,
It has an opening 17a leading to the magnetic pole valley and this opening 1
The blade 17b is bent at an angle with respect to the surface 7a.

Explaining the effect of only the axial flow disk 17, for example, in the case of the configuration shown in FIG. 3, the rotor 10 rotates in the direction of the arrow in the drawing to rotate the rotor 10 from the left side to the right side in the drawing. It is possible to generate a cooling air flow that passes through.

Further, in FIG. 2, when the rotor 10 rotates in the direction of the arrow, cooling air as indicated by the white arrow is generated.
Since the cooling fans 13 and 14 are centrifugal type, the axial flow disk 1
There is a risk that the effect of 7 will be hindered. This cooling fan 1
In order to make effective use of the influence of 3, 14, it is desirable to arrange the cooling fan 13 on the side where the cooling air flows into the rotor so that the blade back surface is as close as possible to the opening 17a of the axial disc 17. . Further, it is desirable that the cooling fan 14 on the side where the cooling air flows out of the rotor is arranged so that the blade front surface comes as close as possible to the opening 17a of the axial disc 17.

Next, the effect obtained when the axial disc 17 is actually used in a vehicle alternator will be described with reference to FIG.
FIG. 1 shows a case where, for example, an axial flow disc 17 is installed so that cooling air is generated from the front side through the rotor 10 to the rear side. In this figure, a rotor 10 supported by bearings 2 and 4 on both sides, and axial flow disks 17 and 17 and a centrifugal cooling fan 1 installed on both sides of the rotor 10.
3 and 14 and an embodiment of a vehicle AC generator including a pulley 8 driven by a belt from an engine crank pulley and transmitted to a rotor 10.

In the operating state, in addition to the cooling air in the centrifugal direction by the centrifugal type cooling fans 13, 14 which has been conventionally used, the cooling air in the axial direction by the axial flow disks 17, 17 is forcibly forced. By the occurrence of, it is possible to improve the cooling property of the field coil.

[0019]

As described above, according to the present invention, an axial flow disk is provided on the side surface of the rotor in addition to the centrifugal cooling fan to reduce the cooling air flow in the radial direction of the rotor by the centrifugal cooling fan. Without this, it is possible to effectively generate the cooling air in the axial direction and improve the cooling performance of the magnetic field coil.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing an embodiment of the present invention.

FIG. 2 is a partial view showing the rotor of FIG. 1 in plan view.

FIG. 3 is a perspective view showing a mounted state of an axial disc.

FIG. 4 is a perspective view showing a conventional rotor.

5 is a perspective view showing the pole core of FIG. 4. FIG.

6 is a perspective view showing the front fan of FIG. 4. FIG.

FIG. 7 is a perspective view showing the rear fan of FIG.

FIG. 8 is an axial sectional view showing an AC generator.

[Explanation of symbols]

 7 Stator coil 10 Rotor 13 Front fan 14 Rear fan 15 Rotating shaft 17 Axial disk

Claims (1)

[Claims] 1. In a vehicular AC generator in which a side surface of a rotor is provided with a centrifugal cooling fan for cooling, a side surface of the rotor is forced to generate cooling air in an axial direction of the rotor. An alternating current generator for a vehicle, wherein an axial disc is provided separately from the cooling fan.