Seal for single wire O.sub.2 sensor
US4786397A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Oct 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4078
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An oxygen sensor (10) having an electrolyte sensor (40) located in a metal shell (14) and an insulating terminal (102) located in a metal sleeve (72). The metal sleeve (72) is secured to the metal shell (14) to define a reference chamber (68) adjacent the interior of the electrolyte sensor (46). A closed end (74) on the sleeve (72) has a plurality of openings (76, 76.sup.1 . . . 76.sup.n) surrounding a central opening (78). A porous filter (90) has a base (92) that is continually urged against end (74) by the action of spring (118) on terminal (102). A grommet (124) located in the central opening (78) has a cylindrical body with a flange (136) that radially engages filter (90) and a series of lands (132, 132.sup.1 or 132.sup.n) that form a plurality of sealing surfaces on lead (12) that connects the electrolyte sensor (46) with a controller. Changes in temperature which cause the components of sensor (10) to expand and contract at different rates are compensated by the grommet (124) and filter (90) to assure that water does not enter the reference chamber (68) through the openings in the closed end (74).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.