JPH05268749A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To reduce the wind sound by a fan, and besides, increase the quantity of wind and prevent the decrease, and perform the fixation of the side plate to a fan excellently in productivity, and further, improve the cooling capacity. CONSTITUTION:A front fan 30 and a rear fan 32 are provided, respectively, at the ends of the magnetic iron cork 5 and 6 of a rotor 4. Circular side plates 31 and 33 are fixed to the outer ends of each vane 30a and 30b of these front fan 30 and rear fan 32, and also these side plates 31 and 33 are provided with guide parts 31a and 33a extending in the axial direction from the peripheries of the side plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular AC generator of a salient-pole rotary type rotor supported by a bracket, and more particularly to an improvement of a fan mounted at the end of a magnetic pole core.

[0002]

2. Description of the Related Art FIG. 5 is a vertical sectional view of a conventional vehicle alternator. In the figure, 1 is a stator, which comprises a stator core 2 and a stator coil 3. Reference numeral 4 denotes a rotor, which is constructed by magnetic pole tooth portions 5a and 6a of both magnetic pole cores 5 and 6 having different polarities being alternately projected in the circumferential direction. 7 is an exciting coil held between the magnetic pole cores 5 and 6, and 8 is the magnetic pole cores 5 and 6.
The rotary shaft 6 is fixed, 9 is a pair of slip rings fixed to the rotary shaft 8 via an insulating sleeve, and 10 and 11 are front and rear fans fixed to the ends of the magnetic pole cores 5 and 6.

On the other hand, 12 and 13 are front brackets and rear brackets, which connect the stator core 2 with tightening bolts 14. For ventilation, the front bracket 12 is provided with a plurality of intake holes 12a at its end and a plurality of exhaust holes 12b at its outer peripheral portion. Further, the rear bracket 13 is provided with a plurality of intake holes 13a at the end portion and a plurality of exhaust holes 13b at the outer peripheral portion for ventilation. The rotating shaft 8 is supported by the front bracket 12 and the rear bracket 13 via bearings 15 and 16. Reference numeral 17 denotes a pulley fixed to the rotary shaft 8, and the rotation of the engine is transmitted via a belt to rotate the rotor 4.

Reference numeral 18 is a rectifier for rectifying the AC voltage induced in the stator coil 3 into a DC voltage and outputting the DC voltage. Reference numeral 19 is a voltage adjustment for detecting the rectifier output voltage and controlling the exciting current to adjust the terminal voltage to a predetermined value. It is a vessel. A brush holder 20 presses the held brush 21 against the slip ring 9 to pass an exciting current.

In the above AC generator, when the rotor 4 is rotated, an AC voltage is induced in the stator coil 3 to supply electric power and generate heat. The stator 1 and the rotor 4 are cooled by the ventilation generated by the rotation of the front and rear fans 10 and 11.

The cooling air generated by the rotation of the front fan 10 is indicated by an arrow A.
Is sucked in through the intake hole 12a of the front bracket 12,
The stator 1 is cooled and discharged from the exhaust hole 12b. After fan
The cooling air generated by the rotation of 11 is sucked in through the intake hole 13a of the rear bracket 13 as indicated by an arrow B, and the rectifier 18 and the voltage regulator are provided.
19. Cool the current collector and stator 1 (not shown)
Emitted from 13b.

[0007]

In the conventional vehicle alternator as described above, the surfaces of the front bracket 12 and the rear bracket 13 facing the blades 10a of the front fan 10 and the blades 11a of the rear fan 11 are uneven. Therefore, there is a problem that the wind noise becomes high due to the wind resistance and the noise becomes large.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an AC generator for a vehicle in which wind noise of a fan is reduced and cooling performance is improved. ..

[0009]

An AC generator for a vehicle according to the present invention is fixed to a stator connected to a front bracket and a rear bracket, and to a rotary shaft supported by bearings on both brackets, A plurality of pairs of magnetic poles are formed in the circumferential direction, and a rotor having a magnetic pole core that holds an exciting coil,
A front fan and a rear fan attached to each end of the magnetic pole core are provided, and each bracket has a plurality of intake holes at an end and a plurality of exhaust holes at an outer peripheral portion of the rotor. In a vehicle alternator configured to cool the air inside the generator by a fan by rotation, an annular side plate is fixed to the outer end portion of each blade of the front fan and the rear fan,
The side plate is provided with a guide portion extending in the axial direction from the outer peripheral portion of the side plate.

[0010]

In the present invention, since the smooth outer side surface of the side plate corresponds to the unevenness due to the intake holes, the resistance due to the wind by the front fan and the rear fan is small and the noise is reduced. Further, the guide portion of the side plate allows the cooled air whose temperature has risen to be smoothly circulated in the radial direction without being circulated again.

[0011]

EXAMPLES Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an automotive alternator according to the present invention. The same parts as those in FIG. Reference numeral 30 is a front fan fixed to the end of the magnetic pole core 5, and an annular side plate 31 is provided at the outer end of each blade 30a.
Are fixed by welding. Reference numeral 32 denotes a rear fan fixed to the end of the magnetic pole core 6, and similarly an annular side plate 33 is fixed to the outer end of each blade 32a by welding. 31a is a side plate 31
It is a guide portion that extends in the axial direction from the outer peripheral portion of and is formed integrally with the side plate 31. Reference numeral 33a is a guide portion extending in the axial direction from the outer peripheral portion of the side plate 33, and is formed integrally with the side plate 33.

2A and 2B are detailed front views of the front fan 30 and the rear fan 32. As shown in FIG. As shown in FIG. 2A, a side plate 31 is fixed to the outer end of the fan 30 by projection welding or the like. As shown in FIG. 2B, a side plate 33 is fixed to the outer end portion of the fan 32 by projection welding or the like. Reference numeral 32b is a reinforcing rib formed by pressing, and reference numeral 32c is a protruding portion for passing a connecting wire of the exciting coil 7 on the back surface side. Although not shown, the front fan 30 also has a reinforcing rib formed by pressing.

The side plate 3 having such a structure
Since the smooth outer surfaces of the reference numerals 1 and 33 correspond to the irregularities formed by the intake holes 12a and 13a, the resistance of the front fan 30 and the rear fan 32 due to the wind is small and the noise is reduced. Further, by providing the guide portions on the side plates 31 and 33, the cooled air whose temperature has risen can be smoothly circulated in the radial direction without being circulated again, so that the rectifier 18, the voltage regulator 19, and the stator. The temperature rise of the coil 3 can be efficiently reduced.

A side plate is provided on the outer end of the blade 30a of the front fan 30.
To fix 31, the projection 31b for projection welding is provided on the annular side plate 31, and the side plate 31 is projection-welded and fixed to the outer end of each blade 30a by using the projection 31b for welding. I am trying.

3A and 3B are a plan view and a side sectional view of a part of the side plate 31. Specifically, the side plate 31 is provided with a circumferential welding-like projection 31b by press working. In this way, by welding the side plate 31 to the front fan 30 by welding, the productivity can be improved. As with the front fan 30, the rear fan 32 is also fixed by projection welding the side plate 33 to the blade 32a.

Further, as shown in FIG. 4, if the recesses 12c and 34 are formed in the portions of the side plates 31 and 33 facing the guide portions 31a and 31b so as to form a labyrinth, the flow of cooling air will be further smoothed. ..

[0017]

As described above, according to the present invention, the annular side plates are fixed to the outer end portions of the front fan and the rear fan, so that the smooth outer surface of the side plate corresponds to the unevenness due to the intake holes. Therefore, the wind resistance by the front fan and the rear fan is also reduced, and the noise due to the wind noise can be reduced. Also, since the end plates of the blades are flat to fix the side plates to the outer ends of the blades of the front fan and the rear fan, it is easy to align the height with a press etc. The side plate is firmly attached to the base plate with high productivity. Further, since the side plate is provided with the guide portion extending in the axial direction from the outer circumference of the side plate, the cooled air whose temperature has risen can be smoothly circulated in the radial direction without recirculation, and the cooling performance can be improved. effective.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a vehicle AC generator according to an embodiment of the present invention.

FIG. 2 is a front view of a front fan and a rear fan.

FIG. 3 is a perspective view showing an example in which welding-like projections are provided on the blades of the front fan according to the embodiment of the present invention.

FIG. 4 is a half cross-sectional view of a vehicle AC generator according to another embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional vehicle alternator.

[Explanation of symbols]

 1 Stator 4 Rotor 5,6 Magnetic pole core 7 Excitation coil 8 Rotation axis 12 Front bracket 12a Intake hole 12b Exhaust hole 12c Recess 13 Rear bracket 13a, 13b Intake hole 15 Bearing 16 Bearing 30 Front fan 30a Blade 31 Side plate 32 Rear fan 32a Blade 33 Side plate 31a, 33a Guide part 34 Recess

Claims (1)

[Claims] 1. A stator connected to a front bracket and a rear bracket, and a stator fixed to a rotary shaft supported by bearings on both brackets, and a plurality of pairs of magnetic poles are formed in the circumferential direction to form an exciting coil. A rotor having a magnetic pole core held therein, a front fan and a rear fan attached to respective ends of the magnetic pole core are provided, and each bracket is provided with a plurality of intake holes at an end, and a plurality of intake holes are provided at an outer peripheral portion. In an alternator for a vehicle, which is provided with an exhaust hole for the fan and cools the inside of the generator with a fan by rotating the rotor, an annular side plate is fixed to the outer end of each blade of the front fan and the rear fan. An alternator for a vehicle, wherein the side plate is provided with a guide portion extending axially from an outer peripheral portion of the side plate.