Internal-combustion engines – Igniters – Sparkers
Reexamination Certificate
2003-08-12
2004-10-19
Huynh, Hai (Department: 3747)
Internal-combustion engines
Igniters
Sparkers
C123S635000, C123S647000, C123S14300R
Reexamination Certificate
active
06805086
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application No. 2002-261498 filed on Sep. 6, 2002.
FIELD OF THE INVENTION
The present invention relates to an ignition coil apparatus and an engine using the ignition coil apparatus.
BACKGROUND OF THE INVENTION
In automotive engines, ignition coils are attached to each cylinder respectively, and are fixed by individual bolts. An ECU and a battery are wired with the ignition coils via each connector one by one. Subsequently, the exposed ignition coils and wiring cords are covered with other member.
However, conventional ignition coil apparatus has many assembly parts, and its assembly work takes much man-power. In order to reduce assembly man-power, it is proposed to integrate plural ignition coils into one piece as an ignition coil apparatus. As shown in
FIG. 5
, this ignition coil apparatus
51
is structured so that plural ignition coils
52
are arranged in predetermined interval to correspond with each plug hole
5
b
of an engine head cover
5
, and molded integrally on a base plate
53
with resin. The ignition coil apparatus
51
is attached on the head cover
5
so that each ignition coil
52
is inserted into the corresponding plug hole
5
b
coaxially. The ignition coil apparatus
51
is fixed to the engine by bolts
53
d.
However, the above ignition coil apparatus
51
have to be manufactured precisely so that all center distances between neighboring plug holes
5
b
(plug hole pitches), and center distances between neighboring coils
52
(coil pitches) exactly match. Otherwise, the integrated ignition coils
52
cannot be inserted coaxially into the corresponding plug holes
5
b
. Furthermore, when even one ignition coil
52
fails, the entire ignition coil apparatus
51
have to be replaced with another complete set, so repair work costs high.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is an object of the present invention to provide a simply structured ignition coil apparatus which can be attached on an engine without misalignment. Each ignition coil can be easily replaced individually, and electrical connection can be performed easily.
In the present invention, the ignition coil apparatus comprises ignition coils, holders and a base plate. Each ignition coil includes a body portion (coil-body) and a head portion (coil-head). The coil-body is inserted into a corresponding plug hole of the engine head cover. The coil-head, which is on the coil-body, is a larger diametrical unit than the coil-body. The ignition coil is hooked on the holder by its coil-head, and is supported by the holder from downward, and is pressed by a base plate from upward onto a lower engine head cover. The holder hooks on the base plate loosely, restricting the inserted coil-body with play.
The base plate has flat recesses which receive the upper section of the coil-heads. Each recess is larger than the coil-head in diameter. The recessed peripheral surface restricts displacement of the coil-head with clearance. During assembly work, by sliding of the coil-head within the recess, alignment between the ignition coil and the plug hole can be adjusted easily. That is, the manufacturing precision of plug hole pitch can be eased. The ignition coils are adjustable on the base plate, therefore the ignition coils do not have to be mounted on the base plate precisely.
Plural ignition coils and the base plate can be installed on the engine head cover all together. On the contrary, Individual ignition coil can be replaced by detaching of the holder.
A connector on the coil-head can be easily fitted into a connector on the holder. When the holder is set on the coil-head, and is snap-fitted on the base plate, electrical connection is performed at one time.
REFERENCES:
patent: 5109828 (1992-05-01), Tagami et al.
patent: 6427674 (2002-08-01), Wylin
patent: 6543430 (2003-04-01), Moga et al.
patent: 6622711 (2003-09-01), Skinner et al.
patent: 6655368 (2003-12-01), Wada
patent: 6675786 (2004-01-01), Tsunenaga et al.
patent: 2004/0123852 (2004-07-01), Tsunenaga et al.
patent: A-5-26144 (1993-02-01), None
patent: A-9-250437 (1997-09-01), None
Denso Corporation
Huynh Hai
Nixon & Vanderhye P.C.
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