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:
Nov. 18, 2003
Filed:
Jun. 11, 2002
Joshua D. Schueler, New Lenox, IL (US);
Michael Dean Tombers, Lockport, IL (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A two-stage filtration assembly for a diesel engine crankcase ventilation system which prevents splash oil from entering into the oil separator and limits oil mist contamination of crankcase air prior to passing into the exhaust port. A first stage filtration assembly includes a first stage filter featuring a wire mesh filtration media contained by a cylindrical tube with perforated (expanded) steel end caps for removing and draining large oil particles and any oil splashing adjacent to the crankcase. A second stage filtration assembly includes a second stage filter featuring a web filtration media, preferably fiberglass, for removing small, air borne oil particles with a high efficiency during the second phase of filtration. The second stage a filter is mounted on an acute angle to allow drainage via gravity to the first stage filter. A passageway in the first stage filtration assembly allows oil to drain from the second stage filter back to the crankcase. The drains prevent oil re-entrainment into the air stream, allowing maximum effectiveness of the filtration elements.