Seal for a sensor element of a gas sensor and method for producing said seal
AssigneeRobert Bosch GmbH
InventorsHelmut Weyl, Bernhard Wild, Peter Dettling
Life of this patent
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Abstract
A seal is proposed for a sensor element of a gas sensor, in particular for determining the oxygen content in exhaust gases of combustion engines. The seal has a sealing element, which is fixed in position in a longitudinal bore of a metallic housing. The sealing element contains a mixture of steatite and at least one low-melting-point glass. To manufacture the seal, a prefabricated sealing ring made of a mixture of steatite powder and powdered glass is used, which is pressed in the longitudinal bore, the sealing ring being subjected to a thermal treatment, in which the glass is melted.
Claims11
A seal in a sensor element of a gas sensor, comprising:
- a sealing arrangement for fixing the sensor element in a longitudinal bore of a metallic housing, wherein the sealing arrangement includes a sealing element containing a mixture of steatite and at least one low-melting-point glass;
- wherein the at least one low-melting-point glass includes one of lead, zinc, bismuth, and alkaline-earth metals in the form of one of oxides, borates, phosphates, and silicates.
A method for manufacturing a seal, comprising the steps of:
- plastically deforming under a pressing force in a longitudinal bore a prefabricated sealing ring made of a mixture of steatite powder and at least one low-melting-point powdered glass;
- and
- subjecting the prefabricated sealing ring to a thermal treatment in which the at least one low-melting point powdered glass is melted.
A seal in a sensor element of a gas sensor for determining an oxygen content in an exhaust gas of a combustion engine, comprising:
- a sealing arrangement that fixes the sensor element in a longitudinal bore of a metallic housing, wherein the sealing arrangement includes a sealing element containing a mixture of steatite and at least one low-melting-point glass;
- wherein the at least one low-melting point glass includes one of lead, zinc bismuth, and alkaline-earth metals in the form of one of oxides, borates, phosphates, and silicates.
Dependencies are inferred from the claim text.