AIR-FILTER AND CARBON-BED ELEMENT FOR AN AIR CLEANER ASSEMBLY

摘要

A ring of activated carbon particles for adsorbing and desorbing hydrocarbon vapors rising from a fuel reservoir in a carburetor of an internal combustion engine. The ring has an elevated portion above a base portion. Both portions extend between an air inlet side and an air outlet side and between top and bottom surfaces for securing and sealing the ring across the air path through an air cleaner. The elevated portion has passages that conduct air for the normal operation of the engine from the air inlet side of the ring to the air outlet side. Hydrocarbon vapors adjacent the outlet side from the carburetor are adsorbed by the carbon in the base and elevated portions before rising to the level of the passages. With the engine running, the vapors previously adsorbed are desorbed by air flowing from the inlet to the outlet side of the air cleaner into the carburetor.