The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1999
Filed:
Oct. 07, 1997
Mark D Osterbrink, St. Clair Shores, MI (US);
Borg-Warner Automotive, Inc., Sterling Heights, MI (US);
Abstract
A combination vent valve/purge valve apparatus (10) for an automotive fuel vapor recovery system canister (14) comprises a purge valve (26) and a vent valve (16) in a single housing. When open, the vent valve (16) allows outside air to enter the canister (14). The purge valve (26), when open, allows fuel vapor to flow from the canister (14) into a vacuum source (12). A gas channel (28, 130, 168) extends between a vent chamber (18) within the vent valve (16) and a purge chamber (28) within the purge valve (26). When the purge valve (26) is open and a purge plunger (86) within the purge chamber (28) is positioned away from the gas channel (28, 130, 168), the manifold vacuum draws air from one side of a diaphragm (126) within the vent chamber (18) drawing the diaphragm (126) and a vent plunger (152) downward against a spring to close the vent valve (16). When the purge plunger (86) is positioned to block the gas channel (28, 130, 168), the spring forces the vent plunger (152) upward to open the vent valve (16). Therefore, a single actuator (36) is able to directly control purge closure position and to indirectly control vent closure position to either purge the canister (14) or evacuate the canister (14) to prepare for a leak check.