Spark plug and resistor material for spark plug

    公开(公告)号:US10811852B2

    公开(公告)日:2020-10-20

    申请号:US16571250

    申请日:2019-09-16

    Abstract: A spark plug which is capable of further improving load life performance and a resistor material for a spark plug are provided.A spark plug includes a center electrode, a terminal fitting, and a resistor disposed between the center electrode and the terminal fitting. The resistor contains glass, a zirconia-based material and an electrically conducting material. The zirconia-based material contains at least stabilized zirconia.

    Spark plug and manufacturing method thereof

    公开(公告)号:US10050417B2

    公开(公告)日:2018-08-14

    申请号:US15692254

    申请日:2017-08-31

    Abstract: Disclosed herein is a spark plug capable of suppressing electrode consumption caused by a spark discharge and a method of manufacturing the same. A section except a welded section formed by welding a tip surface of a center electrode is defined as an unwelded section in side surfaces of a center chip, and a length of the unwelded section along a center axis of the center chip is defined as an unwelded section length. Under this definition, the welded section is formed in order for an unwelded section length in a side surface opposite to an inclination direction side of the center chip in the center chip to become longer than an unwelded section length in a side surface of the inclination direction side of the center chip in the center chip.

    Spark plug
    5.
    发明授权

    公开(公告)号:US10348060B2

    公开(公告)日:2019-07-09

    申请号:US15687854

    申请日:2017-08-28

    Abstract: When one of a center chip and a ground chip of a spark plug is defined as a first chip and another one is defined as a second chip, a discharge starting ridge line, which is a straight ridge line that forms a boundary between two surfaces having different normal line directions, is formed in a portion closest to the second chip in the first chips, and a distance from the discharge starting ridge line to the second chip is configured to be equal at a portion where the first chip and the second chip are opposed to each other.

    Spark plug
    6.
    发明授权

    公开(公告)号:US09831638B2

    公开(公告)日:2017-11-28

    申请号:US15473685

    申请日:2017-03-30

    CPC classification number: H01T13/41 H01T13/20 H01T13/32 H01T13/39

    Abstract: The spark plug has a shaft shaped center electrode, insulator, terminal fitting, ground electrode and resistor. The insulator has an axially penetrating shaft hole, and the center electrode is held in a tip end side of the shaft hole. The terminal fitting has a shaft and a terminal part. The shaft is held in a base end side of the shaft hole. The terminal part is projected from a base end of the shaft hole to a base end side of the spark plug. The ground electrode faces the center electrode in a tip end side of the shaft hole. The resistor is disposed between the center electrode and the terminal fitting in the shaft hole. An axial length L of the resistor is 15 mm≦L≦22.5 mm. An axial length T of the shaft satisfies a relation of 1.25≦T/L.

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