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Patent

Spark electrodes with adjustable gap

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TLDR
In an ignition electrode arrangement for a cylinder in an internal combustion engine, for example an Otto engine, a cylinder head (3 ) bears a first electrode (7 ) and a second electrode (8 ) which interact with one another as discussed by the authors.
Abstract
In an ignition electrode arrangement for a cylinder in an internal combustion engine, for example an Otto engine, a cylinder head ( 3 ) bears a first electrode ( 7 ) and a second electrode ( 8 ) which interact with one another At least the first electrode ( 7 ) is arranged on an ignition means ( 6 ) fastened in the cylinder head According to the invention, the second electrode ( 8 ) is movable relative to the cylinder head ( 3 ) and the first electrode ( 7 ) in order to make it possible to change the spark gap The second electrode ( 8 ) can be mounted on the cylinder head ( 3 ) itself or on the ignition device ( 6 ) The size of the spark gap is controlled during operation by the ignition system of the engine

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Injector-igniters with variable gap electrode

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TL;DR: In this paper, an ignition source for initiating combustion is provided, which includes an electrical delivery conductor mounted in a delivery conductor mounting structure and an electrical ground conductor mounted on a ground conductor and extended from the ground conductor to a point proximate the delivery conductor to define an ignition spark gap.
References
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Gasoline internal combustion engine

TL;DR: In this paper, a gasoline internal combustion engine with direct fuel injection is presented, where a mass electrode is disposed on the piston so as to project upwardly into the combustion chamber and is movable with the piston toward and from the spark plug center electrode.
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Contact-breaking spark plug

Albert Beck
TL;DR: In this paper, the earth pole was fixed or adjusted from the outside during operation in the internal space of the piston, and the same adjusting and fixing activity can also take place with the positive pole.