Glow plug for diesel engines
First Claim
Patent Images
1. A glow plug for diesel engines comprising a ceramic heater supported, with one end thereof cantilevered toward the outside of a hollow holder;
- said ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of said U-shaped heating portion, both leads being formed integrally of an electrically conductive sialon the outer periphery of at least one of said leads is bonded and held in said holder by an insulating layer;
the rear end of at least one of said leads is connected to an electrode connected to a metallic lead wire via a bonding material;
an insulating sheet formed of an insulating ceramic material is inserted into a slit formed between said leads and said leads and said insulating sheet are integrally bonded via a bonding material containing 6-10% wt. % titanium, with the balance being any one or both of copper and silver and including foil, paste and coating materials forming a reaction layer having a thickness of 1-20 μ
m, whereby air-tightness is improved between said leads and said insulating sheet.
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Abstract
A glow plug for diesel engines in which a ceramic heater is supported, with the one end thereof cantilevered toward the outside, by the tip of a hollow holder ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of the U-shaped heating portion, both being formed integrally by an electrically conductive ceramic material. The outer periphery of at least one of the leads is bonded and held in the holder via an insulating layer. The rear end of the other of the leads is connected by a metallic lead wire to an external connection terminal. The ceramic heater and other component members are bonded integrally by a bonding material containing a reactive metal.
28 Citations
18 Claims
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1. A glow plug for diesel engines comprising a ceramic heater supported, with one end thereof cantilevered toward the outside of a hollow holder;
- said ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of said U-shaped heating portion, both leads being formed integrally of an electrically conductive sialon the outer periphery of at least one of said leads is bonded and held in said holder by an insulating layer;
the rear end of at least one of said leads is connected to an electrode connected to a metallic lead wire via a bonding material;
an insulating sheet formed of an insulating ceramic material is inserted into a slit formed between said leads and said leads and said insulating sheet are integrally bonded via a bonding material containing 6-10% wt. % titanium, with the balance being any one or both of copper and silver and including foil, paste and coating materials forming a reaction layer having a thickness of 1-20 μ
m, whereby air-tightness is improved between said leads and said insulating sheet.
- said ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of said U-shaped heating portion, both leads being formed integrally of an electrically conductive sialon the outer periphery of at least one of said leads is bonded and held in said holder by an insulating layer;
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2. A glow plug for diesel engines comprising a ceramic heater supported with one end thereof cantilevered toward the outside of a hollow holder;
- said ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backward from both ends of said U-shaped heating portion, both being formed integrally by an electrically conductive sialon;
the outer periphery of at least one of said leads is bonded and held in said holder via an insulating layer;
the rear end of at least one of said leads is connected by means of a metallic lead wire via a bonding material to an external connection terminal; and
said ceramic heater and other components are integrally bonded by forming metallized layers via said bonding material to form reaction layers, said bonding material including 6-10 wt. % titanium, with the balance being one or both of silver solder copper forming an improved air-tight seal between said leads and said insulating sheet. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17)
- said ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backward from both ends of said U-shaped heating portion, both being formed integrally by an electrically conductive sialon;
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11. A glow plug in accordance with claim 11, wherein:
said powder of a titanium-copper alloy is under 350-mesh.
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18. A glow plug for diesel engines, comprising:
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a hollow holder including electrical leads and support surfaces; a ceramic heater formed of an electrically conductive sialon ceramic material to provide a U-shaped heating portion and ceramic material leads extending from said U-shaped heating portion; and
,a bond integrally joining said ceramic heater to one of said electrodes and supporting surfaces, said bond formed by a bonding material containing 3-10 wt % substantially pure titanium powder, with the balance being one or more of copper and silver for forming a bond with an improved air-tight seal.
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Specification
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Current AssigneeHitachi Metals (Thailand) Ltd., Jidoshakiki Company Limited
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Original AssigneeHitachi Metals (Thailand) Ltd., Jidoshakiki Company Limited
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InventorsOkazaki, Seiji, Yokoyama, Shigeki, Aota, Takashi, Imaizumi, Makoto, Hatanaka, Koji
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Primary Examiner(s)Evans, Geoffrey S.
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Application NumberUS07/642,703Time in Patent Office769 DaysField of Search219/205, 219/270, 219/553, 219/85.2, 123/145 A, 123/145 RUS Class Current219/270CPC Class CodesF02B 3/06 with compression ignition c...F23Q 7/001 Glowing plugs for internal-...
