Spark plug for internal combustion engine
AssigneeDenso Corporation
InventorKanechiyo Terada
Life of this patent
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Abstract
A spark plug 1 includes a tubular housing 2, a tubular insulator 3 held inside the housing 2, a center electrode 4 held inside the insulator 3 such that a distal end portion 41 protrudes, a ground electrode 5 that forms a spark discharge gap G between it and the center electrode 4, and a standing member 6 that stands distalward from a distal end portion 21 of the housing 2. In at least one of a pair of side surfaces 61 of the standing member 6 which face in a plug circumferential direction, there is formed a guide step portion 62 for guiding the flow of an air-fuel mixture in a combustion chamber of an internal combustion engine to the spark discharge gap G.
Claims6
A spark plug for an internal combustion engine, comprising:
- a tubular housing;
- a tubular insulator held inside the housing;
- a center electrode held inside the insulator such that a distal end portion protrudes;
- and
- a ground electrode that forms a spark discharge gap between it and the center electrode,
- wherein
- the spark plug further comprises a standing member that stands distalward from a distal end portion of the housing,
- in at least one of a pair of side surfaces of the standing member which face in a plug circumferential direction, there is formed a guide step portion for guiding flow of an air-fuel mixture in a combustion chamber of the internal combustion engine to the spark discharge gap
- the guide step portion is constituted of part of a groove portion formed in the side surface of the standing member, and
- the groove portion is shaped so as to be deepened while extending from a radially outer side to a radially inner side.
Dependencies are inferred from the claim text.