Electrochemical oxygen sensing element, particularly for determination of oxygen content in the exhaust gases of automotive internal combustion engines

US4065372A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolf-Dieter Hacker
• Karl-Hermann Friese · Leonberg, DE
• Leo Steinke · Waiblingen, DE
• Helmut Weyl

Key dates

• Filing date: Oct 27, 1976
• Grant date: Dec 27, 1977
• Expiry date: Oct 27, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4077
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To provide protection to the sensitive solid ion conductive electrolyte, a metal sleeve is placed to surround the electrolyte, with clearance, and formed with openings having an increasing cross-sectional area starting from the housing or socket towards the bottom of the solid electrolyte tube to provide an approximately even temperature gradient upon exposure of the element to exhaust gases, the sleeve being additionally so formed that deflection surfaces or vanes are formed internally thereof, for example by punching the openings through the sleeve as elongated slots leaving deflecting vanes, to deflect gases passing through the openings from direct impingement on the solid electrolyte tube to protect the solid electrolyte tube against impact and contamination.