Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2003-07-22
2004-07-20
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C290S055000, C290S044000, C180S002200
Reexamination Certificate
active
06765324
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electric generator, more particularly to an electric generator for use with a vehicle wheel.
2. Description of the Related Art
FIG. 1
illustrates a conventional electric generator
2
for use with a bicycle
1
. The conventional electric generator
2
is mounted on a wheel axle
12
and provides electric power to a lamp
13
mounted on the bicycle
1
.
Referring to
FIG. 2
, the conventional electric generator
2
is shown to include a housing
21
, three stator coils
22
, and three magnet rings
23
. The housing
21
is secured to a wheel hub
14
on the wheel axle
12
such that the housing
21
is capable of rotating about the wheel axle
12
when a bicycle wheel
11
(see
FIG. 1
) rotates. The stator coils
22
, which are connected in series, are disposed in the housing
21
and are mounted on the wheel axle
12
. The magnet rings
23
are disposed in the housing
21
around the stator coils
22
, and are mounted on an inner surface of the housing
21
.
As such, rotation of the magnet rings
23
with the housing
21
when the bicycle wheel
11
rotates results in an induced electrical current in the stator coils
22
that is provided to the lamp
12
via a cable
24
.
The following are some of the drawbacks of the conventional electric generator
2
:
1. The bicycle wheel
11
must be detached when it is desired to install the electric generator
2
.
2. Variations in speed of rotation of the bicycle wheel
11
results in an unstable induced electrical current such that the service life of the lamp
13
is adversely affected.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide an electric generator for use with a vehicle wheel that can eliminate the aforesaid drawbacks of the prior art.
According to the present invention, there is provided an electric generator adapted for use with a vehicle wheel. The electric generator comprises:
a housing adapted to be mounted on the vehicle wheel and having a base wall and a surrounding wall that extends from a periphery of the base wall and that cooperates with the base wall to confine a receiving space, the surrounding wall being formed with inlet and outlet vent holes that are in spatial communication with the receiving space;
an air impeller disposed in the receiving space and having a spindle that extends in an,axial direction transverse to the base wall and that is coupled rotatably to the base wall, the air impeller being formed with a plurality of radial impeller blades such that flow of air into the receiving space through the inlet vent hole and out of the receiving space through the outlet vent hole when the vehicle wheel rotates results in rotation of the air impeller in the receiving space;
a stator coil mounted securely in the receiving space; and
a magnet ring disposed in the receiving space around the stator coil and coupled co-rotatably to the air impeller such that rotation of the magnet ring with the air impeller results in an induced electrical current in the stator coil.
REFERENCES:
patent: 3876925 (1975-04-01), Stoeckert
patent: 4179007 (1979-12-01), Howe
patent: 4423368 (1983-12-01), Bussiere
patent: 5038049 (1991-08-01), Kato
patent: 6700215 (2004-03-01), Wu
Christie Parker & Hale LLP
Le Dang
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