Spark plug cap with ignition voltage detective capacitor for internal combustion engine
First Claim
1. A spark plug cap covering the terminal of a spark plug for an internal combustion engine, including;
- an insulative cap body;
a case for housing an ignition coil to be attached to the insulative cap body and having a terminal for the ignition coil;
a first conductor housed in the insulative cap body for carrying an ignition voltage produced by the ignition coil to the spark plug terminal; and
a second conductor located around the first conductor keeping a predetermined distance therefrom while sandwiching an insulative material therebetween such that a capacitor is formed between the first and second conductors for detecting the ignition voltage;
wherein the improvement comprises;
a first contact provided at the end of said insulative cap body and electrically connected with said second conductor; and
a second contact electrically connected with the terminal of said case such that the second contact is brought into contact with the first contact when said case is attached to said insulative cap body.
1 Assignment
0 Petitions
Accused Products
Abstract
A spark plug cap covering the terminal of a spark plug for an internal combustion engine, made up of an insulative cap body, an ignition coil unit case housing the coil and having a terminal for the ignition coil, a first conductive shaft housed in the insulative cap body for carrying an ignition voltage produced by the ignition coil to the spark plug terminal, and a second conductor located around the first conductor keeping a predetermined distance therefrom separated by the insulative material of the cap body such that a capacitor is formed between the first and second conductors for detecting the ignition voltage. The cap is further provided with a first contact in the form of an annulus provided at the end of said insulative cap body and electrically connected with said second conductor, and a second contact in the shape of a leaf spring electrically connected with the terminal of said case, such that the second contact is brought into contact with the first contact when said case is threaded into said insulative cap body, thereby ensuring electrical connection therebetween.
28 Citations
17 Claims
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1. A spark plug cap covering the terminal of a spark plug for an internal combustion engine, including;
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an insulative cap body; a case for housing an ignition coil to be attached to the insulative cap body and having a terminal for the ignition coil; a first conductor housed in the insulative cap body for carrying an ignition voltage produced by the ignition coil to the spark plug terminal; and a second conductor located around the first conductor keeping a predetermined distance therefrom while sandwiching an insulative material therebetween such that a capacitor is formed between the first and second conductors for detecting the ignition voltage; wherein the improvement comprises; a first contact provided at the end of said insulative cap body and electrically connected with said second conductor; and a second contact electrically connected with the terminal of said case such that the second contact is brought into contact with the first contact when said case is attached to said insulative cap body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A spark plug cap covering the terminal of a spark plug for an internal combustion engine, including;
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an insulative cap body; a case for housing an ignition coil to be attached to the insulative cap body and having a terminal for the ignition coil; a first conductor housed in the insulative cap body for carrying an ignition voltage produced by the ignition coil to the spark plug terminal; a second conductor located around the first conductor keeping a predetermined distance therefrom while sandwiching an insulative material therebetween such that a capacitor is formed between the first and second conductors for detecting the ignition voltage; and a shield for shielding the second conductor; wherein the improvement comprises; a first pair of contacts provided at the end of said insulative cap body, one of which being electrically connected with said second conductor while the other being connected to the shield; and a second pair of contacts electrically connected with the terminal of said case such that the second pair of contacts are brought into contact with the first pair of contacts respectively when said case is attached to said insulative cap body. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification