JPS59169354A - Vehicular ac generator - Google Patents

Abstract

PURPOSE:To prevent the disconnection of stator leads and to improve the cooling by providing a synthetic resin insulator assembly integrated with a plurality of insulators for insulating between the stator leads and a frame and an arcuate- shaped cover support. CONSTITUTION:Stator leads 1 are coupled at the coil end of a stator 8 through a lead hole 12 of an insulator 2 of a synthetic resin insulator assembly to the terminal 13 of a rectifier 9. The open end of the cover 8 is supported by an arcuate-shaped cover support 4, and the closed end is secured to a frame 2 together with the rectifier 9. Simultaeously, the assembly 6 is secured to the frame 2 together with the rectifier 9 at the mount 6a. A fan 16 is secured to the end face of a rotor 7 and rotated. Cooling air intaked from the vent hole 11 of a cover 10 cools the coil end 8a through the vent hole 17 of the frame 2 and is exhausted from the upper vent hole 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an insulator that provides insulation between a stator lead and a frame (rear end frame) of a vehicle alternator.

In recent years, there has been a strong demand for vehicle alternators to be more efficient, smaller, and more compact. In order to obtain high efficiency, it is necessary to reduce the diameter of the rotor and increase the length of the rotor and rotor shaft in order to rotate the rotor at high speed, which inevitably causes vibrations to occur in the rotor shaft.

In conventional generators, as shown in Figure 1,
By providing the bearing 18 near the side surface of the rotor 7, the axis of the rotor 7 can be made as short as possible, and the stator lead 1 for connecting the stator 8 to the multi-rectifier 9 can be prevented from being disconnected due to vibration. In order to insulate between the frame 2 and the frame 2, an insulator 3 made of an elastic insulating material is fitted into a hole bored in the frame 2. Therefore, since a plurality of stators 8 are provided corresponding to the number of poles of the vehicle alternator, and the number of stator leads 1 also corresponds to the number of stators 8, a plurality of insulators 3 are provided.
There is a problem in that it requires a lot of man-hours because it is necessary to assemble these separately to the frame 2, and since the insulator 3 and the cover support part 4 of the frame 2 are separate parts, it is difficult to make them come into close contact with each other. Since the die-cast cover support part 4 is molded integrally with the frame 2, the ventilation holes 50 are difficult to assemble, and are likely to cause assembly defects and leakage of cooling air.
There are problems such as limited dimensions.

The present invention has been made in view of the above problems, and provides a generator that can effectively prevent disconnection of stator leads due to vibration, improve cooling performance, and be easy to manufacture. The purpose is to provide.

However, the main focus of this configuration is to configure an alternator using a synthetic resin insulator assembly that integrates a plurality of insulators and an arcuate cover support portion.

The present invention will be described below with reference to embodiments shown in the drawings. Second
4, 1 is a stator l', 2 is a frame (rear end frame), and 5 is a ventilation hole bored in the frame 2. Reference numeral 6 denotes an insulator assembly in which a conventional insulator 3 and a cover support portion 4 are integrated, and is made of synthetic resin. 7 is a Ransol type rotor, 8
is the stator. 9 represents a rectifier housed outside the frame 2. IO is a cover in which a ventilation hole 11 is bored.

The stator lead 1 passes through the reed at the coil end of the stator 8, through the lead hole 12 in the insulator 3 of the insulator M solid body 6, and is connected to the terminal portion 13 of the rectifier 9 with a screw 4, so that the stator 8 and the rectifier 9 are electrically connected. and mechanically coupled. The open end of the cover 10 is supported by an arcuate cover support part 4, and the closed end of the cover 10 is fixed to the frame 2 together with the rectifier 9 by screws 15 and is mechanically held. At the same time, the insulator assembly 6 is fixed to the frame 2 with screws 15 together with the rectifier 9 at its mounting portion 6a. Also, fan 16
is attached to the end face of the rotor 7 and rotates together with the rotor 7. 17 is a ventilation hole provided in the frame 2.

In the above configuration, the rotor 7 rotates within the stator 8, and the AC power generated in the stator 8 is sent to the rectifier 9 through the stator lead 1, where it is converted to DC,
Output to the outside. Since the frame 2 is usually used as the negative electrode of the direct current, the stator lead 1 and the frame 2 must be electrically insulated. Further, since the vehicle alternator itself is used under severe environmental conditions, the insulation is required to be very perfect. Thus, the lead 1 is connected to the rectifier 9 through the lead hole 12 of the insulator 3, ensuring reliable insulation from the frame 2, and the insulator 3 is fixed to the frame 2 as an insulator assembly 6. It can withstand severe vibration conditions.

On the other hand, the cooling air taken in from the ventilation holes 11 of the cover 10 by the rotating fan 16 is transferred to the ventilation holes 17 of the frame 2.
The heat is discharged through the upper ventilation hole 5 to the outside, but at this time, the coil end 8a of the stator 8 is cooled, and the heat generated in the stator 8 is released to the outside.

Here, in order for the cooling air to be efficiently taken in through the ventilation holes 11, the cover support portion 4 of the insulator assembly 6 needs to be in close contact with the inner surface of the cover IO. Although it is necessary for the insulator 3 to be in close contact with the frame 2 and the cover support part 4, in the present invention, since the insulator 3 is integrated with the cover support part 4, it is easy to obtain close contact between them. .

As described above, the present invention has the above configuration, and includes the cover support portion 4 and the frame (rear end frame).
2 are separate parts, the shape of the ventilation holes 5 can be freely selected, improving cooling performance.

Furthermore, since the plurality of insulators 3 are integrated, the number of man-hours required for assembly can be reduced, and the number of parts can be reduced. Furthermore, since the open end of the cover IO is supported by the cover support part 4 made of synthetic resin, it is possible to reduce the noise caused by the vibration of the cover IO. It has a number of excellent effects, such as no wire breakage in the lead 1, and no leakage of cooling air, which further improves cooling performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of a conventional generator, FIG. 2 is a sectional view of the main parts of the generator according to the present invention, FIG. 3 is a front view of the insulator assembly, and FIG. In the figure, part of the cover is cut away. 1... Stator lead, 2... Frame, 3...
Insulator, 4... Cover support IB, 6... Insulator assembly, 7... Rotor, 8... Stator, 9... Rectifier, 10... Cover, 11... Ventilation hole, 12 ...Lead hole. Figure 1 Figure 2 Figure 2

Claims (1)

[Claims] a rotor; a cooling fan provided on the side of the rotor; a stator provided on the outer periphery of the rotor;
In a vehicle alternator equipped with a cooling fan, a frame provided to surround a stator, a rectifier provided outside the frame, and a cover provided with ventilation holes provided to cover the rectifier, An alternating current for a vehicle, characterized by comprising a synthetic resin insulator assembly that integrates an arc-shaped cover support portion that is in close contact with the inner wall of the cover, and a plurality of insulators that insulate between the stator lead and the frame. Generator.