Patent ID: 7849841
Filing Date: 2010-12-14
Classification: F01M

Abstract:
1. A crankcase ventilation system for an internal combustion engine generating blowby gas in a crankcase containing engine oil and oil aerosol, said system comprising an air-oil separator having an inlet receiving said blowby gas and oil aerosol from said crankcase, an air outlet discharging clean blowby gas, and an oil outlet discharging scavenged separated oil, and a pump driven by said engine and pumping said scavenged separated oil from said oil outlet of said separator to said crankcase wherein said pump comprises a chamber having a diaphragm therein dividing said chamber into first and second subchambers, said first subchamber receiving variable pressure which flexes said diaphragm in back and forth directions to expand and contract said first subchamber and inversely respectively contract and expand said second subchamber, said second subchamber having an inlet receiving scavenged separated oil from said oil outlet of said separator, said second subchamber having an outlet discharging said scavenged separated oil to said crankcase.