Gas measurement sensor, especially for determining oxygen concentration in exhaust gases of internal combustion engines
First Claim
1. A gas measurement sensor (10), especially for determining oxygen concentration in exhaust gases of internal combustion engines, witha pipe-shaped metal housing (11), which hasmeans (12, 13, 14) for the sealing installation in a gas measurement line and contains in its longitudinal bore (19)at least one longitudinal section of an axially extending sensor (27), which has an elongated, planar shape, is electrically insulated in respect to the metal housing (11), is divided by means of a seal disposed crosswise to the longitudinal bore (19) of the metal housing (11) intoa section (27/1) on the gas measuring side anda section (27/2) on the connecting side, has at least one layered, electrically conductive contact surface (36) on the end section (27/3) of its section (27/2) on the connecting side on at least one of its large areas (39), which is in electrical connection via a strip conductor (37) witha sensor element (38) or a layered heating element and on which an electrical contact element (46) presses, which is part of a connector plug (43), which on the connecting side is in electrical contact on the connecting side with a connecting conductor (57) of the gas measurement sensor (10) and is disposed on an electrically insulating contact element support (44), also a part of the connector plug (43), where the connector plug (43) also has an electrically insulating opposite wall (45), which is disposed on the second large area (40) of the end section (27/3) of the section (27/2) on the connecting side of the sensor (27) and cooperates with the said connecting element support (44),characterized in thatthe contact element support (44) and the opposite wall (45) of the connector plug (43) are two components which are at a distance from each other, located parallel to the sensor (27) and electrically insulating, which each face a large area (39, 40) of the sensor (27) with a front (48, 49), where the front (48, 49) of the contact element support (44) supports the at least one contact element (46) which rests on an associated contact surface (36) on the sensor (27), and thatan annularly-shaped spring element (47) is provided, which surrounds in a mechanically pre-stressed manner the contact element support (44) and the opposite wall (45) of the connector plug (43) in the area of the end section (27/3), disposed in the area between them both, of the section (27/2) on the connecting side of the sensor (27), and which has an interruption (59) in the peripheral extent.
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Accused Products
Abstract
A gas measurement sensor (10) which sealingly encloses an axially oriented sensor (27) having an elongated, planar shape in the longitudinal bore (19) of its metal housing (11); while the section (27/1) on the gas measuring side of the sensor (27) has at least one sensor element (38) and possibly heating elements, the end section (27/3) on the connecting side is provided with layered contact surfaces (36), which are in contact with the sensor elements (38)/heating elements via strip conductors (37). A connector plug (43) surrounding the sensor (27) on the connecting side consists of a contact element support (44), an opposite wall (45), contact elements (46) and an annularly-shaped spring element (47); because of its mechanical pre-stressing, the spring element (47) presses the contact elements (46) of the contact element support (44) and of the opposite wall (45) against the contact surfaces (36) of the sensor (27). On the connecting side the contact elements (46) have connecting points (56) for connecting conductors (57). The connector plug (43) allows the installation on the sensor element (27) without damage to the sensor contact surfaces (36) and possible coatings on connector plug contact elements (46).
80 Citations
19 Claims
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1. A gas measurement sensor (10), especially for determining oxygen concentration in exhaust gases of internal combustion engines, with
a pipe-shaped metal housing (11), which has means (12, 13, 14) for the sealing installation in a gas measurement line and contains in its longitudinal bore (19) at least one longitudinal section of an axially extending sensor (27), which has an elongated, planar shape, is electrically insulated in respect to the metal housing (11), is divided by means of a seal disposed crosswise to the longitudinal bore (19) of the metal housing (11) into a section (27/1) on the gas measuring side and a section (27/2) on the connecting side, has at least one layered, electrically conductive contact surface (36) on the end section (27/3) of its section (27/2) on the connecting side on at least one of its large areas (39), which is in electrical connection via a strip conductor (37) with a sensor element (38) or a layered heating element and on which an electrical contact element (46) presses, which is part of a connector plug (43), which on the connecting side is in electrical contact on the connecting side with a connecting conductor (57) of the gas measurement sensor (10) and is disposed on an electrically insulating contact element support (44), also a part of the connector plug (43), where the connector plug (43) also has an electrically insulating opposite wall (45), which is disposed on the second large area (40) of the end section (27/3) of the section (27/2) on the connecting side of the sensor (27) and cooperates with the said connecting element support (44), characterized in that the contact element support (44) and the opposite wall (45) of the connector plug (43) are two components which are at a distance from each other, located parallel to the sensor (27) and electrically insulating, which each face a large area (39, 40) of the sensor (27) with a front (48, 49), where the front (48, 49) of the contact element support (44) supports the at least one contact element (46) which rests on an associated contact surface (36) on the sensor (27), and that an annularly-shaped spring element (47) is provided, which surrounds in a mechanically pre-stressed manner the contact element support (44) and the opposite wall (45) of the connector plug (43) in the area of the end section (27/3), disposed in the area between them both, of the section (27/2) on the connecting side of the sensor (27), and which has an interruption (59) in the peripheral extent.
Specification