Copper core combustion cup for pre-chamber spark plug
AssigneeDENSO International America, Inc.
InventorsJeongung Hwang, Nicholas C. Polcyn, Christopher Thomas
Life of this patent
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Abstract
A spark plug for an internal combustion engine includes a spark plug housing. An insulator is concentrically located within the housing and has a distal end extending from an outer surface of the housing. A center electrode extends from a proximal end of the insulator. A ground electrode is secured to the housing and has an electrode tip arranged a distance from the center electrode. A chamber cap fixedly secured to the housing and surrounding both the center and ground electrodes, includes a laminate shell and a plurality of orifices.
Claims23
A spark plug for an internal combustion engine, the spark plug comprising:
- a spark plug housing;
- an insulator concentrically located within the housing and having a distal end extending from an outer surface of the housing;
- a center electrode extending from a proximal end of the insulator;
- a ground electrode secured to the housing and having an electrode tip arranged a distance from the center electrode;
- and
- a chamber cap fixedly secured to the housing and surrounding both the center and ground electrodes, the chamber cap including a laminate shell having a plurality of orifices;
- wherein
- the housing includes a plurality of mounting threads;
- a weld fixedly secures the chamber cap to the housing;
- and
- the weld extends circumferentially around the chamber cap at a position spaced from a position where the chamber cap directly contacts the housing.
A chamber cap secured to a spark plug housing of a spark plug for an internal combustion engine, the chamber cap comprising:
- an inner layer and an outer layer being formed from a conventional material;
- a core layer arranged between the inner and outer layers, the core layer being formed from an alloyed material having a higher thermal conductivity than that of the conventional material;
- a plurality of orifices extending from the inner layer through the core layer to the outer layer;
- and
- a plurality of sleeves fixedly secured within the plurality of orifices;
- wherein
- the housing includes a plurality of mounting threads;
- a weld fixedly secures the chamber cap to the housing;
- and
- the weld extends circumferentially around the chamber cap at a position spaced from a position where the chamber cap directly contacts the housing.
A spark plug, comprising:
- a housing;
- an insulator secured within the housing;
- a center electrode extending from a proximal end of the insulator;
- a ground electrode secured to the housing at a distance from the center electrode, wherein the distance establishes a sparking gap;
- a laminate chamber cap fixedly secured to the housing and surrounding the center and ground electrodes, the laminate chamber cap having an inner layer, a core layer, and an outer layer, wherein the core layer has a higher thermal conductivity than that of the inner and outer layers;
- wherein
- the housing includes a plurality of mounting threads;
- a weld fixedly secures the chamber cap to the housing;
- and
- the weld extends circumferentially around the chamber cap at a position spaced from a position where the chamber cap directly contacts the housing.
Dependencies are inferred from the claim text.