KR20040008324A - Brush holder assembly of alternator for vehicle - Google Patents

Abstract

PURPOSE: A brush holder assembly is provided to achieve improved operating reliability of AC generator and performance of motor vehicle by preventing performance degradation of AC generator caused due to the electrical short. CONSTITUTION: A brush holder assembly(3) comprises a slip ring accommodation unit(31) having a slip ring(30) press-fit to a rotor shaft(4); and a brush mounting unit(34) including a brush(32) supported by a spring so as to apply a battery power to the slip ring, and a terminal(33) connected to the brush so as to supply a battery power. The slip ring accommodation unit of the brush holder assembly has an inner surface with an inclined surface(37) formed in the direction same as the rotating direction of the slip ring so as to collect dust of the brush. The inclined surface has a slot(38) formed at the end thereof.

Description

Brush holder assembly of alternator for vehicle

The present invention relates to a brush holder assembly for an automotive alternator, and more particularly, to an alternator for preventing brush dust scattering in a brush holder assembly that facilitates magnetization of an initial rotor assembly during power generation through an alternator. It is about improvement of brush holder assembly.

In general, the automotive alternator is one of the engine electronics, which is connected to the engine and the belt to charge the consumed battery power and to supply the current required for operation with other electronics.

Such an automotive alternator 1 is shown in FIG. 1;

The stator assembly 15 including the stator core 13 and the stator coil 14 is press-fitted between the driver and the slip ring end frames 11 and 12.

Inside the stator assembly 15 is supported by a bearing and fixed to the driver and the slip ring end frame (11, 12), the rotor shaft having a pulley (18) to receive power at the front end ( 19) is installed in the transverse direction.

The middle portion of the rotor shaft 19 is coupled to the spool bobbin 22 wound around the rotor coil 20 and connected to a slip ring 21 press-fitted to the rear of the rotor shaft 19.

Outside the spool bobbin 22 is provided with a rotor assembly 24 coupled to the rotor core 23 having a plurality of rotor poles in the axial direction to accommodate the spool bobbin 22.

A brush holder incorporating a brush 25 for magnetizing the rotor core 23 by applying battery power to the rotor coil 23 through the slip ring 21 to the slip ring 21 of the rotor assembly 24 ( 26) are connected.

Outside of the slip ring 21, the heat sink and the diode are used to rectify the alternating voltage of the voltage regulator 27 and the alternating voltage to direct current to maintain the voltage generated in the rotor and stator assembly 15 in a constant state. And a rectifier 28 composed of a terminal or the like.

Automotive alternator (1) configured as described above is that the rotor shaft 19 and the rotor assembly 24 coupled to the output of the engine to generate power through the rotation action in the stator assembly (15),

In this way, the power generation is possible by applying the power of the battery during the initial generator operation to magnetize the rotor assembly 24, the slip ring 21 is pressed into the rotor shaft 19 by means of magnetizing the rotor assembly (24) The brush holder 26 is interposed between the brushes 25 for supplying power in contact with each other.

As described above, the brush 25 connected to the slip ring 21 generates brush dust due to abrasion caused by friction, and the brush dust is slip ring receiving portion 26 'by the centrifugal force of the slip ring 21 rotation. The inner flow was caused to accumulate between the brush 25 and the slip ring accommodating portion 26 ′ which protrude a predetermined size for connection with the slip ring 21 in the brush holder 26.

If dust accumulates between the brush 25 and the slip ring accommodation portion 26 as described above, the brush 25 may not be properly compensated for position due to abrasion, leading to a decrease in power generation performance due to an electrical short circuit. I was hugging.

In order to prevent the accumulation of the brush dust as described above, as shown in FIG. 3, a conventional slot 29 is formed inside the slip ring accommodation portion 26 ′ in which the slip ring 21 is accommodated, thereby accumulating brush dust. It was planned.

However, since the shape of the slot 29 is formed at right angles to the center of the slip ring accommodation portion 26 ', it is not possible to perform a smooth integration operation of the brush dust representing the circular flow direction by centrifugal force, thereby causing an inadequate effect. The effectiveness is incomplete.

Accordingly, the present invention has been made to solve the above problems, and further includes a slot having an inclined surface in the same direction as the rotational direction of the slip ring at the inner circumference of the slip ring accommodating part in which the slip ring is accommodated. It aims to improve power generation performance by preventing malfunction of generator.

1 is a simplified cross-sectional view showing the overall configuration of a typical automotive alternator,

Figure 2 is a simplified plan view showing a brush holder assembly for an automotive alternator to which the prior art is applied,

3 is a simplified plan view showing a slip ring accommodating part for accumulating brush dust of a brush holder assembly for an automotive alternator to which the prior art is applied;

Figure 4 is a simplified plan view showing a brush holder assembly for an automotive alternator to which the technique of the present invention is applied,

5 is a simplified plan view showing a slip ring receiving portion for integrating brush dust of the brush holder assembly for an automotive alternator to which the technique of the present invention is applied and a simplified plan view showing another embodiment;

* Description of the symbols used in the main parts of the drawings *

3; brush holder assembly

30; slip ring

31; slip ring accommodation

37; slope

38; slot

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

Figure 4 is a simplified plan view showing a brush holder assembly for an automotive alternator to which the technique of the present invention is applied, Figure 5 shows a slip ring accommodating portion for integrating brush dust of the brush holder assembly for an automotive alternator to which the technique of the present invention is applied. One simplified plan view and another embodiment will be described together as a simplified plan view.

Brush holder assembly (3) for the automotive alternator;

As shown in FIG. 4, the slip ring accommodating part 31 through which the slip ring 30 press-fitted into the rotor shaft 4 is provided, and a brush supported by a spring to apply battery power to the slip ring 30. And a brush mounting portion 34 having a terminal 33 or the like connected to the brush 32 to supply battery power.

The brush mounting portion 34 is provided with a plurality of fixing holes (not shown) through the slip ring accommodation portion 31 for insertion of the brush 32 at one end thereof, and the brush holder assembly 3 in the alternator outside. The brush arm 35 necessary for fixing) is provided to form a fastening hole 36.

The slip ring accommodating part 31 which is integrally provided with the brush mounting part 34 is a cylindrical shape having a circular cross section, and the brush 32 protrudes a predetermined portion through the penetrating fixing hole. The outer end of the slip ring 30 is pressed into the protruding end of the rotor shaft (4).

An inner circumference of the slip ring accommodating part 31 is formed with an inclined surface 37 in the same direction as the rotational direction of the slip ring 30 at equal intervals, and a slot 38 is formed at the end of the inclined surface 37. Thus, the worn brush dust is accumulated through the slot 38.

The slot 38 is configured to be perpendicular to the inner circumference of the slip ring accommodation portion 31 or to have an acute angle with respect to the traveling direction of the inclined surface 37 so that brush dust is scattered by the centrifugal force of the slip ring 30. Minimize.

Brush holder assembly 3 for an automotive alternator configured as described above,

First, the rotor shaft 4 of the alternator, which receives power through the pulley by starting the car, rotates, and at the same time, the power of the battery slips through the brush 32 accommodated in the brush mounting part 34 of the brush holder assembly. It is applied to the ring 30, which immediately transfers current to the rotor coil to magnetize the rotor core located outside the rotor coil to form magnetic lines of force.

At this time, as the rotor shaft 4 rotates, three-phase alternating current is generated in the stator coil by the action of the magnetized rotor coil, and the generated current is applied to the diode of the rectifier. Supply the required power.

As described above, the slip ring 30 and the brush 32 required for the magnetization of the rotor core are rotated at high speed in a connected state, and wear of the brush is caused by friction, and the worn brush 32 is changed into a dust form to slip. The inside of the slip ring accommodation portion 31 flows along the rotational direction of the ring 30.

The flowing brush dust is naturally accumulated on the inner wall of the slot 38 along the inclined surface 37 formed in the slip ring accommodating part 31, and the accumulated dust is formed in the air flow due to the continuous rotation of the slip ring 30. This makes it impossible to escape to the outside.

As described above, the dust accumulated through the inclined surface 37 and the slot 38 is not likely to be scattered to the entire alternator including the inside of the slip ring accommodating part 31, and is accumulated between the brush and the brush fixing phase. Electric short circuit phenomenon is prevented and stable power generation is possible.

The brush holder assembly for an automotive alternator of the present invention as described above prevents the scattering of brush dust and forms a predetermined accumulation space by the inclined surface and the slot formed inside the slip ring accommodating portion, thereby degrading the performance of the alternator due to an electrical short circuit. It is a useful invention that can improve the operation reliability and automobile performance of the alternator by the stable power generation work by preventing the.

Claims (3)

A slip ring accommodating part 31 through which the slip ring 30 press-fitted to the rotor shaft 4 is provided, a brush 32 supported by a spring for applying battery power to the slip ring 30, In constructing a brush holder assembly for an automotive alternator comprising a brush mounting portion (34) having a terminal (33) connected to the brush (32) for supplying battery power; The brush holder assembly 3 is formed on the inner circumference of the slip ring accommodating portion 31 to form inclined surfaces 37 in the same direction as the rotational direction of the slip ring 30 at equal intervals so as to accumulate brush dust. Brush holder assembly for a motor alternator, characterized in that it comprises a slot (38) formed at the end of the inclined surface (37). The method of claim 1; The slot 38 is a brush holder assembly for an automotive alternator, characterized in that perpendicular to the inner circumference of the slip ring receiving portion (31). The method of claim 1; The slot 38 is a brush holder assembly for an automotive alternator, characterized in that the acute angle with respect to the traveling direction of the inclined surface (37).