Seal arrangement for a sensing element of a gas sensor
AssigneeRobert Bosch GmbH
InventorHelmut Weyl
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Abstract
A seal arrangement for a sensing element of a gas sensor, in particular for determining the oxygen content in exhaust gases of internal combustion engines, includes a packet made up of several seal elements, packed one on top of another, which immobilize the sensing element in a longitudinal bore of a metallic probe housing. A funnel-shaped diversion element lying in the axial direction of the sensor is integrated into the seal elements packed one above another in such a way that gas permeability between the diversion element and the inner wall of the probe housing is ensured. Toward the measured-gas end of the sensor, a small gap remains open between the sensing element and the diversion element.
Claims11
A seal arrangement for a sensing element of a gas sensor, the sensor including a metallic probe housing having an inner wall and a longitudinal bore, the seal arrangement comprising:
- a packet composed of a plurality of seal elements, the seal elements being packed one on top of another, the seal elements immobilizing the sensing element in the longitudinal bore of the probe housing;
- and
- a funnel-shaped diversion element lying in an axial direction of the sensor, the diversion element being integrated into the seal elements so as to ensure a gas permeability via a space between the diversion element and the inner wall of the probe housing, a small gap remaining open between the sensing element and the diversion element toward a measured-gas end of the sensor.
Dependencies are inferred from the claim text.