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Ceramic heater

  • US 4,475,029 A
  • Filed: 03/01/1983
  • Issued: 10/02/1984
  • Est. Priority Date: 03/02/1982
  • Status: Expired due to Fees
First Claim
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1. A ceramic heater for an internal combustion engine comprising:

  • a cylindrical metal housing constructed and arranged to be mounted on an internal combustion engine;

    a central electrode fixed to one end of said housing and electrically insulated from said housing;

    a cylindrical ceramic insulating sleeve secured to the other end of said metal housing; and

    a heating element formed of a ceramic material for generating heat when supplied with electric power, said heat element having(i) an electrode section inserted into and secured to one end of said insulating sleeve, and having a first and a second electrode portions, and(ii) a heat generating section extending out of said insulating sleeve and having a first and a second heat generating portions to be directly exposed to an air-fuel mixture, both forward ends of said first and second heat generating portions being connected with each other, the cross-sectional area of said electrode section being larger than that of said heat generating section;

    means for electrically connecting said first electrode portion with said metal housing; and

    means for electrically connecting said second electrode portion with central electrode.

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