Seal for single wire O2 sensor

摘要

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, 761 . . . 76n) 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, 1321 or 132n) 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).