JPS6125333Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cooling structure for a vehicle charging generator mounted on a vehicle to charge a storage battery and supply power to an electrical load device of the vehicle.

First, FIG. 1 shows a sectional view of a conventional general vehicle charging generator and will be described. In Fig. 1, 1 is a rotor that is composed of magnetic poles that alternately form N and S different poles in the circumferential direction and a field coil that magnetizes these magnetic poles, and 2 is a rotor that is inserted into the rotor 1. It is a rotating shaft, and both ends thereof are supported by bearings 3 and 4. A slip ring 5 is fixed to the rotating shaft 2 and is connected to the field coil. 6 is a brush that slides on the slip ring 5; 7 is a brush holder that holds the brush 6; 8 is a stator, which includes an iron core disposed opposite the magnetic poles of the rotor through a small gap; and this iron core. It consists of an armature coil wound around the 9
a and 9b are a positive rectifier and a negative rectifier, respectively, for full-wave rectification of the AC output generated in the armature coil of the stator 8; 10 is a cooling fan;
1 is fixed to the rotating shaft 2 together with the pulley 12. Reference numeral 13 denotes a front bracket that supports the bearing 3 and one end of the stator 8, and includes mounting flanges 13a and 1.
3b is integrally formed by casting.

14 is the bearing 4, the brush holder 7, and the stator 8.
A mounting flange 14a is integrally formed by casting with one end of the rear bracket supporting the flow straightening devices 9a and 9b. A voltage regulator 15 is arranged on the back side of the brush holder 7 and maintains the output voltage at a predetermined value. 16 is an output terminal, and 17 is a through bolt for fixing the front bracket 13 and rear bracket 14 via the iron core of the stator 8.

Next, the operation of the conventional device will be explained.

First, although not shown, when the engine is started, the rotor 1 is rotationally driven via the belt, and current flows through the field coil to magnetize the rotor 1, so that the stator 8 receives a predetermined AC output. This AC output is full-wave rectified by the positive rectifier 9a and the negative rectifier 9b, is controlled to a predetermined voltage value by the voltage regulator 15, and is output via the output terminal 16 (not shown). Power is supplied to a plurality of electrical devices, such as storage batteries and lamps.

However, in the conventional device described above, although the air inside the generator is sucked out by the fan 10, the gap between the rotor 1 and the stator 8 is very small, about 0.3 to 0.5 mm. The large air flow resistance caused a decrease in air volume.

Therefore, since the air volume decreases, the armature coil of the stator 8, the field coil of the rotor 1, and the rectifier 9
A, 9b, voltage regulator 15, etc. had the disadvantage of reducing the cooling effect.

In order to eliminate the above-mentioned drawbacks, this invention forms an axial gap between the inner circumferential surface of the bracket and the outer circumferential surface of the stator core, and also provides a plurality of cooling holes on the circumference of the bracket facing the stator core. The object of the present invention is to provide an excellent vehicle charging generator that can reduce air flow resistance and increase air volume by providing a medium suction hole, thereby increasing the cooling effect of the generator.

An embodiment of this invention shown in FIGS. 2 and 3 will be described below.

First, in FIG. 2, 18 is the bracket 13,
A gap is provided between the inner circumferential surface of 14 and the outer circumferential surface of the stator 8, 19 is a plurality of cooling medium suction holes provided on the circumference of the bracket facing the stator 8, and 20 is a front hole. This is the butt portion between the bracket 13 and the rear bracket 14.

In the device of the present invention constructed as described above, the through bolts 17 are tightened and fixed to the front bracket 13 and the rear bracket 14 via the iron core of the stator 8 at three to four locations on the circumference. However, in most other parts of the circumference, a gap 18 is provided between the brackets 13, 14 and the stator 8, and the front bracket 13 and rear bracket 14 are butted over the entire circumference. Therefore, the air sucked out by the fan 10 is sucked in from the rear surface of the rear bracket 14, cools the voltage regulator 15 and rectifiers 9a and 9b, and further cools the armature coil of the stator 8. The above gap 18
The liquid is sucked out through the front opening of the front bracket 14.

At this time, the gap 18 is much larger (approximately 3 to 5 mm) than the gap between the stator 8 and the rotor 1, so the air flow resistance is reduced, the air volume is increased, and the cooling effect is significantly increased.

Furthermore, at the same time, the stator 8 and its armature coil are cooled by sucking cooling air directly from a plurality of cooling medium suction holes 19 provided on the circumference of the bracket facing the stator 8. Said gap 1
8, the cooling effect of the generator is significantly doubled along with the increase in air volume.

In addition, in the above embodiment, in order to provide a gap between the bracket and the outer periphery of the stator, the diameter of the bracket is enlarged over the entire diameter, and a plurality of cooling holes are installed on the circumference of the bracket facing the stator. Although a medium suction hole is shown, in order to create a gap between the bracket and the outer periphery of the stator, the diameter of the bracket can be enlarged only at the stator portion, as shown in Figures 4 and 5, for example. However, the same effect can be obtained even if the other portions are formed to have a smaller diameter than the gap portion and a plurality of coolant suction holes are provided in the stepped portion.

As described above, according to this invention, in addition to passing the cooling air through the gap between the stator and rotor as in the past, cooling air is passed through the gap between the stator core and the rotor between the outer periphery of the stator and the bracket. Since an axial gap with a large dimension is provided to allow the cooling air to pass through the gap, the air flow resistance is reduced by passing the cooling air through a side path with less flow resistance, and the air volume can be increased. This has the effect of increasing the cooling effect.

At the same time, since the stator and its armature coil are cooled by sucking cooling air directly from a plurality of cooling medium suction holes provided on the circumference of the bracket facing the stator, the above-mentioned gap is provided. This has the effect that as the air volume increases, the cooling effect of the generator increases significantly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional device, Fig. 2 is a sectional view showing an embodiment of this invention, Fig. 3 is a front view showing an embodiment of this invention, and Fig. 4 is a sectional view showing another embodiment of this invention. FIG. 5 is a left side view showing another embodiment of this invention. In the figure, 1 is a rotor, 2 is a rotating shaft, 3 and 4 are bearings, 5 is a slip ring, 6 is a brush, 8 is a stator, 9a and 9b are rectifiers, 10 is a fan, and 11
is a nut, 12 is a pulley, 13 is a front bracket, 14 is a rear bracket, 15 is a voltage regulator, 16 is an output terminal, 17 is a through bolt, 18 is a gap, 19 is a cooling medium intake hole, and 20 is a butt part. . In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The stator core is clamped with bolts passed through the front and rear brackets to create an axial gap larger than the gap between the core and the rotor between the inner peripheral surface of the bracket and the outer peripheral surface of the core. forming a gap, allowing a cooling medium to flow through the gap, and
A charging generator for a vehicle, characterized in that a plurality of coolant suction holes are provided on the circumference of a bracket facing the stator core.