Ceramic heater
First Claim
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.
1 Assignment
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Accused Products
Abstract
A ceramic heating element is held in a metal housing to be mounted on an internal combustion engine, so that the heating element is operated as a glow plug for igniting an air-fuel mixture. The ceramic heating element is formed of an electrode section housed in the housing and a heat generating section extending out of the housing, whereby the heat generating section is exposed to the mixture in an engine cylinder. The electrode and heat generating sections are divided into two portions, respectively, and both forward ends of divided heat generating portions are connected with each other, so that electric current flows from one of the electrode portions through the divided heat generating portions to the other electrode portion.
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Citations
2 Claims
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1. A ceramic heater for an internal combustion engine comprising:
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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. - View Dependent Claims (2)
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Specification
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- Resources
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Current AssigneeNippondenso Co., Ltd. (DENSO Corporation)
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Original AssigneeNippondenso Co., Ltd. (DENSO Corporation)
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InventorsYoshida, Hitoshi, Fukazawa, Takeshi, Atsumi, Morihiro, Yamaguchi, Shunzo, Kumoi, Tomio
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Primary Examiner(s)Mayewsky, Volodymyr Y.
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Application NumberUS06/471,158Time in Patent Office581 DaysField of Search219/260, 219/267, 219/270, 219/523, 219/553, 123/145 A, 123/145 R, 361/264, 361/265, 361/266, 431/262, 338/326, 338/330, 373/134, 252/514, 252/518, 252/520US Class Current219/270CPC Class CodesF23Q 7/001 Glowing plugs for internal-...
