Ignition coil

Details Ignition coil Ignition coil

2001-10-30

2004-05-11

Nguyen, Tuyen T. (Department: 2832)

Inductor devices

Winding with terminals, taps, or coil conductor end...

C336S198000

Reexamination Certificate

active

06734774

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an ignition coil; in particular, the invention relates to an ignition coil that can prevent filled resin from leaking.
2. Description of the Related Art
An ignition coil ignites combustible gas by high voltage. Referring to
FIG. 1
a
, a conventional ignition coil
10
comprises a casing
20
, a bobbin
30
, a primary coil (not shown), at least one secondary coil (not shown), a circuit (not shown) and a bar core
70
. The casing
20
is made of plastic.
The bobbin
30
is disposed inside the casing
20
, as shown in
FIG. 1
a
. The bobbin
30
is provided with a primary portion
50
and two secondary portions
60
. The primary portion
50
separates the secondary portions
60
by partitions. The primary portion
50
is provided with two terminals
51
. Each of the secondary portions
60
is provided with two pins
62
.
The primary coil surrounds the primary portion
50
and is electrically connected to the terminals
51
. One end of the secondary coil attaches to one of the pins
62
, and the other end of the secondary coil attaches to the other pin
62
by solder.
The bar core
70
penetrates the bobbin
30
to provide a magnetic route. The circuit converts a DC voltage to a triggering-voltage signal. The triggering-voltage signal inputs to the primary coil. By the voltage conversion of the primary coil and the secondary coil, the D.C. voltage is converted to a high voltage. The high voltage ignites the combustible gas through the pins
62
in a tip-discharging manner.
The casing
20
is filled with a resin such as an epoxy resin so as to prevent high voltage, as generated by the coil portion, from leaking out of the casing
20
and a dielectric breakdown from being caused in the ignition coil by the high voltage.
FIG. 1
b
is an enlarged view of the pins
62
in
FIG. 1
a
. During assembly, the pins
62
must pass through holes
25
, formed in the casing
20
, to expose their tips. As a result, the filled resin can leak out of the casing
20
through the holes
25
. Accordingly, a design in which the diameter of the hole
25
is smaller than the diameter of the pin
62
is provided. However, in such design, the wire (not shown), attached to the pin
62
, is easily broken when the pin
62
passes through the hole
25
, is because the size of the pin
62
is bigger than that of the hole
25
so that the pin
62
is easily squeezed out of the hole and then the wire is twitched by the squeezed pin
62
.
Therefore, it is desirable to develop an ignition coil that can prevent the attached wire from breaking and prevent filled resin from leaking while assembling.
SUMMARY OF THE INVENTION
In order to address the disadvantages of the aforementioned ignition coil, the invention provides an ignition coil that can prevent filled resin from leaking.
Another purpose of this invention is to provide an ignition coil that can prevent the attached wire from breaking.
Accordingly, the ignition coil of this invention comprises a casing, a plurality of pins and a bobbin. The pins are disposed inside the casing. The bobbin, having a plurality of terminals corresponding to the pins respectively, is disposed inside the casing. Each of the terminals is provided with a ring-shaped portion in contact with the corresponding pin.
Furthermore, each of the ring-shaped portions surrounds the corresponding pin so as to be in contact with the corresponding pin.
Furthermore, each of the terminals is provided with a protruding portion. The bobbin is provided with a primary portion and at least one secondary portion, and the terminals are formed on the secondary portion. The primary portion is provided with another two terminals.
Furthermore, the ignition coil comprises a core disposed inside the bobbin. The casing is made of plastic, and each of the pins is made of metal.


REFERENCES:
patent: 4041430 (1977-08-01), Hrynewycz
patent: 4683518 (1987-07-01), Gwozdz
patent: 4924200 (1990-05-01), Kitahara et al.
patent: 5179365 (1993-01-01), Raggi

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