KR100440878B1 - Brush assembly of alternator for vehicle - Google Patents

Abstract

The present invention relates to a brush assembly for an automotive alternator, which contributes to improving the performance, quality stability and cost reduction of an alternator by improving the brush assembly and securing stable durability and operating reliability. A stator assembly 15 press-fitted between the phases, a rotor shaft 17 installed laterally in the inner side thereof, and a rotor assembly 25 installed midway thereof; An alternating current generator having a brush assembly 30 for energizing the battery power to the rotor coil 18 and the stator coil 14 outside the slip ring 19 fixed to the rear end of the rotor shaft 17 ( In 10);

The brush assembly 30 is formed by molding one side end 33 of the lead wire 32 on the rear surface of the brush 31 having a reduced thickness and reducing the thickness of the brush 31 in the opposite position in contact with the slip ring 19. Fixed with (Molding); The lead wire 32 is fitted to the rear surface of the brush 31 through a wire slot 42 which is further formed separately from the insertion hole 41 formed to insert the brush 31 into the brush holder 40. It is characterized in that the coupling with the terminal 35 which is in contact with the end of the spring (34).

Description

Brush assembly for automotive alternator {Brush assembly of alternator for vehicle}

The present invention relates to a brush assembly for an automotive alternator, and more particularly, to improve reliability by improving a brush, a spring, a lead wire, and a terminal connected to a slip ring to apply power for operating an alternator. It is about providing a brush assembly.

Automotive alternator is one of the engine electronics that is connected to the engine and the belt to charge the battery power consumed and to supply the current required to operate the other electronics.

The automotive alternator is composed of a stator assembly press-fitted between a slip ring and a driver end frame and a rotor assembly supported by a rotor shaft in the inner side thereof.

In the rotor assembly, a slip ring connected to the rotor coil is press-fitted to the rear end of the rotor shaft, and a brush assembly for conducting battery power to the rotor coil and the stator coil is connected to the outside thereof.

The brush assembly is built in the brush holder and is continuously connected to the slip ring by a spring further provided at the rear.

The brush assembly 1 to which the prior art is applied will be described with reference to FIGS. 2 and 3 as follows.

The brush assembly 1 has a lead wire 3 that is tempered and fixed to the brush 2 having a quadrangular shape, and the lead wire 3 has a terminal 4 and a welding 5 to which power is supplied. Is fixed.

The outside of the lead wire (3) via the spring (6) so that the brush (2) is always in contact with the slip ring, the outside of the lead wire (3) by the spring (6) lead wire (3) The sleeve 7 is coated in order to prevent the damage.

The prior art brush assembly as described above;

Since the lead wire is fixed to the conventional brush by tamping, the electrical conductivity is weak, so that the voltage drop is high and the current due to heat generation is reduced, thereby adversely affecting the performance of the generator.

Further, by having the sleeve further outside the lead wire, unnecessary cost burden is caused, and the lead wire portion welded to the terminal becomes vulnerable, which causes the durability of the brush assembly.

As the brush is stretched and retracted, the process of bending or folding the lead wire located inside the spring is repeated, making the lead wire less durable and causing the lead wire to be pinched between the compression and expansion springs or the spring to be repositioned. Jams can not be adhered to.

If the jam occurs as above, there is no electrical contact between the brush and the slip ring phase, so the final purpose of the alternator is not made smoothly. It is.

In addition, since dust generated when the brush is worn and flows into the slot in which the brush, the spring, and the lead wire are embedded, the lead wire, the spring, and the sleeve have a high risk of being fixed by the dust.

Hereinafter, the present invention has been made in order to solve the problems described above, and an object thereof is to improve the durability of the brush and the spring, the lead wire, and the brush holder to improve durability and operation reliability and to reduce the cost.

1 is a cross-sectional configuration diagram of an automotive alternator for explaining the invention.

Figure 2 is a front view showing a brush to which the prior art is applied, (A) is a state with a spring, (B) is a view of the state with the spring removed.

Figure 3 is an assembly cross-sectional view of a state in which a brush is applied to the prior art is applied to the brush holder.

4 is a cross-sectional view of a brush assembly to which the technique of the present invention is applied.

5 is a cross-sectional view of a partially omitted state extracting the main portion of the brush to which the technique of the present invention is applied.

6 is a cross-sectional view of the brush holder taken along the line A-A of the brush assembly applied to FIG.

Figure 7 is a free cross-sectional view of the brush assembly to which the technique of the present invention is applied.

8 is a cross-sectional view of a compressed state of a brush assembly to which the technique of the present invention is applied.

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

10; Alternator

19; Slip ring

30; Brush Assembly

31; brush

32; Lead wire

35; terminal

36; Embossing

40; Brush holder

41; Insertion hole

42; Wire slot

45; Tapered face

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the preferred embodiment of the present invention for achieving the above object.

1 is a cross-sectional configuration diagram of an automotive alternator for explaining the invention, FIG. 4 is a cross-sectional configuration diagram of a brush assembly to which the technique of the present invention is applied, and FIG. 6 is a cross-sectional view of a brush holder taken along line A-A of the brush assembly applied to FIG. 4, FIG. 7 is a free state cross-sectional view of the brush assembly to which the technique of the present invention is applied, and FIG. 8 is a technique of the present invention. The cross-sectional view of the applied brush assembly is described together.

In the automotive alternator 10, a stator assembly 15 including a stator core 13 and a stator coil 14 is press-fitted between the driver and the slip ring end frames 11 and 12, as shown in FIG. The rotor shaft 17 is supported by a slip ring and a bearing 16 pressed into the driver end frames 11 and 12 and has a pulley 17 'for power transmission at its tip.

In the middle of the rotor shaft 17, the spool bobbin 20, which is wound around the rotor coil 18 and connected to the rear slip ring 19, is press-fitted. Rotor cores (23, 24) having a) is coupled to the rotor assembly 25 for accommodating the spool bobbin 20 is provided.

The outer side of the slip ring 19 is provided with a brush assembly 30 for energizing the battery power to the rotor coil 18 and the stator coil 14.

In the present invention, it is characterized in that to improve the brush assembly 30 to improve the durability and operating reliability and contribute to cost reduction.

Brush assembly 30 of the present invention for this purpose;

One side end of the lead wire 32 is fixed to the rear side of the brush 31 having a reduced thickness by reducing the thickness of one side of the brush 31 at the opposite position to be in contact with the slip ring 19 by molding. do.

The opposite end 33 ′ of the lead wire 32 engages with the terminal 35 which is in contact with the end of the spring 34 fitted to the rear of the brush 31.

The terminal 35 has a protruding embossing 36 for supporting the spring 34 in a stable state, and a connection portion 37 for connecting the lead wire 32 to one side of the terminal 35. Have more.

Unlike the conventional terminal, the connection part 37 is constructed by welding the terminal 36 surrounding the lead wire 32.

The lead wire 32 is connected to the brush 31 and the terminal 35 on the rear of the spring 34 to be separate from the insertion hole 41 formed for inserting the brush 31 in the brush holder 40. The wire slot 42 is formed to be further formed.

Tapered surface 45 having a predetermined angle (a) to the upper side of the brush 31 to the fixed point (P) on the rear side of the brush 31 is fixed to one side end 33 of the lead wire 32 The lead wire 32 may be prevented from interfering with the brush 31 when the brush 31 is contracted.

The brush assembly 30 of the present invention as described above;

By combining the brush 31 and the lead wire 32 by molding, the electrical conductivity is excellent, the voltage drop is low, and the heat generation is reduced, so that the excitation current is increased to contribute to the output of the generator.

In addition, during the contraction and extension of the brush 31, the spring 34 also contracts and elongates. In this process, there is no interference with the lead wire 32, and the brush 31 wears by contact with the slip ring 19. The dust generated as it does not flow into the wire slot 42 is prevented jam.

The lead wire 32 is connected to the brush 31 and the terminal 35 through a wire slot 42 formed separately from the insertion hole 41 formed to insert the brush 31 into the brush holder 40. This is because they are connected between phases.

When the brush 31 is operated, the lead wire 32 is folded to the wire slot 42 formed in the brush holder 40, so that interference with the spring 34 is excluded, and the lead wire 32 is When folded, the part combined with the brush 31 is folded.

At this time, the thickness of the rear surface of the brush 31 is reduced than the upper end, and the tapered surface 45 of which the predetermined angle (a) is upwardly upward with respect to the fixing point P on which one end 33 of the lead wire 32 is fixed. By having it can minimize the interference between the brush 31 and the lead wire (32).

The brush assembly 30 of the present invention improves the brush 31, the lead wire 32, the terminal 35, and the brush holder 40 to prevent jams by eliminating mutual interference and to prevent sticking due to dust. By preventing and smoothly supplying the current necessary for the operation of the alternator 10, the operability of the alternator can be improved and contribute to quality stability.

In particular, by eliminating unnecessary parts such as sleeves for protecting the lead wires, the overall cost burden can be reduced.

The present invention as described above can obtain a number of effects, such as by improving the brush assembly to ensure stable durability and operation reliability can contribute to the improvement of the performance of the alternator, quality stability and cost reduction.

Claims (3)

A stator assembly 15 press-fitted between the driver and the slip ring end frames 11 and 12, a rotor shaft 17 installed laterally in the inner side thereof, and a rotor assembly 25 installed midway thereof; An alternating current generator having a brush assembly 30 for energizing the battery power to the rotor coil 18 and the stator coil 14 outside the slip ring 19 fixed to the rear end of the rotor shaft 17 ( In 10); The brush assembly 30 is; Reducing the thickness of the brush 31 in the opposite position in contact with the slip ring 19 and fixing the egg end 32 of the lead wire 32 to the rear of the brush 31 having a reduced thickness by molding; The lead wire 32 is fitted to the rear portion of the brush 31 through a wire slot 42 which is further formed separately from the insertion hole 41 formed to insert the brush 31 in the brush holder 40. Brush assembly for an automotive alternator, characterized in that coupled to the terminal (35) connected to the end of the spring (34). The method of claim 1; Forming a protruding embossing (36) on the terminal (35) to support the spring (34) in a stable state; One side of the terminal 35 is a brush assembly for an automotive alternator, characterized in that it further has a connecting portion (37) which can be wrapped around the lead wire (32) and connected. The method of claim 1; The rear surface of the brush 31 to which one side end 33 of the lead wire 32 is fixed has a predetermined angle a such that the upper portion of the brush 31 is upward with respect to the lead wire 32 fixing point P. Brush assembly for an automotive alternator, characterized in that the tapered surface (45) is further formed to exclude interference between the lead wire (32) and the brush (31) when the brush (31) shrinks.