Sheath heater

US6710305B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gert Lindemann · Lichtenstein, DE
• Wilfried Aichele · Winnenden, DE
• Andreas Reissner · Stuttgart, DE
• Friedericke Lindner · Gerlingen, DE
• Christof Rau · Stuttgart, DE
• Guenter Knoll · Stuttgart, DE

Key dates

• Filing date: Oct 17, 2002
• Grant date: Mar 23, 2004
• Expiry date: Oct 17, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23Q7/001
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A sheath heater in a sheathed-type glow plug for diesel engines is described, having at least one generally internal insulation layer and at least one generally external conductive layer, both layers making up a ceramic composite structure. The sheath heater has a generally uniform overall cross-section, generally over its entire length, and, in the area of a tip of the sheath heater, the proportion of the insulation layer in the overall cross-section increases, whereas the proportion of the conductive layer in the overall cross-section decreases.