Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-04-25
2002-11-26
Le, Dang Dinh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S088000
Reexamination Certificate
active
06486584
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a structure for preventing a flame of an alternator for a vehicle, and in particular to a structure for preventing a flame of an alternator for a vehicle which is capable of preventing a flame due to a spark from being moved to the outside and discharging dust formed due to a friction of a brush.
2. Description of the Background Art
Generally, an alternator(alternating current generator) for a vehicle is formed of a stator, a rotor and a diode, When an agitation switch is turned on, a current of a battery is applied to a rotor coil through a voltage regulator for thereby generating a magnetic force line. When an engine is started, and a rotor is rotated, a power is generated in the stator coil for thereby generating a 3-phase alternating current. The thusly generated 3-phase alternating current is rectified by the diode. When the voltage of the terminal B is higher than the voltage of the battery, the battery is charged, and the current is applied to each load.
As shown in
FIG. 1
, the alternator includes a driving shaft
2
provided in a front housing
1
sealed using a rear cover
4
and having a slip ring
3
, and a brush assembly
5
installed at one side of the driving shaft
2
. The brush assembly
5
includes a brush
6
contacting with the slip ring
3
, a brush holder
7
for receiving the brush
6
, and a sealing member
10
disposed between the front housing
1
and the rear cover
4
for sealing the brush holder
7
.
The brush holder
7
includes an extended portion
7
b
. A flowing path K is formed toward an outlet hole
7
a
of the extended portion
7
b
and the rear cover
4
based on an inlet hole
10
a
, and a net-shaped wire net
20
is formed in the outlet hole
7
a.
Therefore, an external air is flown to the inside of the front housing
1
based on the flowing path K formed by the brush holder
7
and the sealing member
10
. A fine dust of the brush
6
formed due to a friction with the slip ring
3
based on the rotation of the driving shaft
2
is discharged toward the outlet hole
7
a
through the flowing path K.
In a state that a certain gas is fully filled in an engine room for a ship, a flame generated by a spark of the brush
6
and the slip ring
3
is blocked by the wire net
20
provided in the outlet hole
7
a
of the brush holder
7
for thereby preventing the flame from being charged to the outside. In addition, the flame is not transferred to the engine room filled with the gas. Since the flowing path K is formed by the brush holder
7
and the sealing member
10
, in order to form the flowing path K, the structure of the brush holder
7
must be changed, so that the fabrication process is complicated, and the cost thereof is increased.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a structure for preventing a flame of an alternator for a vehicle which is capable of preventing an explosion due to the spark and a flame from being transferred to the engine room by forming the flowing path and discharging a fine dust of the brush without changing the structure of the brush assembly formed of a holder cap and a brush holder. Which are detachable.
In order to achieve the above object, there is provided a structure for preventing a flame of an alternator for a vehicle in which the brush assembly includes a brush holder receiving a brush and a holder cap detachably engaged to the brush holder, and a first flow way is formed in an upper portion of the brush holder and the holder cap for passing through the air flown through an inlet hole formed in a sealing member, and a second flow way is formed at a side portion of the brush holder and the holder cap in an alternator for a vehicle which is formed of a brush assembly having a brush contacting with a slip ring inserted onto one end of a driving shaft installed in a front housing and a sealing member provided at a lower portion of the brush assembly, a flame prevention structure for an alternator of a vehicle.
REFERENCES:
patent: 3171050 (1965-02-01), Gordon
patent: 4659950 (1987-04-01), Gotoh
patent: 4959576 (1990-09-01), Horibe et al.
patent: 5296772 (1994-03-01), Bradfield et al.
patent: 5424600 (1995-06-01), Ishikawa et al.
patent: 5550418 (1996-08-01), Chung
patent: 6294856 (2001-09-01), Ishida et al.
Dinh Le Dang
Valeo Mando Electrical Systems Korea Limited
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