Electrical connectors – Having spark or glow plug cover
Patent
1991-11-26
1993-01-19
Paumen, Gary F.
Electrical connectors
Having spark or glow plug cover
439 34, 123169R, 313135, H01R 13648
Patent
active
051803135
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a ground connection for the spark plugs of a multi-cylinder internal-combustion vehicle engine, with the metal spark plug casing of each spark plug including a ground electrode and being screwed into a cylinder head of the engine. The engine is electrically connected with a vehicle ground and the vehicle ground is electrically connected with one pole of the vehicle battery.
PRIOR ART
Spark plugs are components of an ignition system for the internal-combustion engine of a vehicle. Each spark plug is composed of a metal center electrode which is embedded in a ceramic insulator. The lower portion of the insulator is received by a metal spark plug casing which includes a connecting thread for screwing the spark plug into a cylinder head of the engine. A second electrode, the ground electrode, is welded to the base of the spark plug. The ground electrode is connected with vehicle ground by way of the cylinder head of the engine.
The ground electrode has a fixed air gap from the center electrode, the electrode gap. High voltage ignition current coming from the distributor flows through the center electrode and bridges the electrode gap as a break-over ignition spark.
For appropriate engine performance, the spark must be strong enough to ignite the fuel mixture. This requires a relatively large electrode gap. However, the greater the electrode gap, the greater must also be the voltage required to produce the ignition spark.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a ground connection with the aid of which ignition is improved. The invention is here based on the realization that it is not only important to increase the voltage. Rather, the invention is characterized in that, in order to improve ignition, an additional ground cable is provided for each spark plug. Each one of these cables is connected with the spark plug casing of the associated spark plug and the additional ground cables are connected with a common ground cable which is connected with the minus pole of the battery.
The following advantages are realized with the ground connection according to the invention: The generated spark is noticeably stronger. The engine starts better than an engine without an additional ground cable. It runs better while still cold; the engine does not buck. The engine reaches its operating temperature more quickly but does not get too hot. When hot, the engine runs quietly and powerfully. Vehicle pickup is better, independently of whether the engine is still cold or already warmed up. Engine performance on a hill is very good. Fuel consumption is less.--For one certain vehicle, the fuel consumption for short-distance driving dropped from 14 1/100 km to 11 1/100 km; for highway driving at a speed of 130 km/h, fuel consumption dropped from 9 1/km to 7.5 1/km. The stronger ignition spark results in fewer missed ignitions. The fuel is burnt more cleanly and more beneficial to the environment. Also, the spark plugs remain cleaner. Finally, the combustion chamber--pistons and valves--are also cleaner. Optimum engine tune-up with the aid of the additional ground cable results in results which are also considerable when the exhaust gases are examined separately.
Modifications and features of the invention are disclosed in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention is illustrated in the drawing FIGURES and will be described in greater detail below. It is shown in:
FIG. 1, a schematic circuit diagram;
FIG. 2, a spark plug, partially in an axial sectional view, partially in a frontal view;
FIG. 3, a view similar to FIG. 2 of a further preferred embodiment, on a reduced scale; and
FIG. 4, a view similar to FIG. 3 of another preferred embodiment of the invention.
The electrical circuit of a motor vehicle is fed from a battery 1. The positive pole 12 of this battery 1 is connected by way of an ignition lock--not shown--and an ignition coil connected with an ignition distributor. By way of the ignition distributor
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