Importance

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Abstract

Disclosed herein is a four stroke engine breather comprising a camcase cover including an outer surface partially defining a camcase cover chamber including first and second sub-chambers communicating with each other and a sump sub-chamber, an inlet passage through the camcase cover and communicating with the camcase cover chamber for conveying an air/oil mist from the camcase to the camcase cover chamber, a restricted oil drainage passage through the camcase cover and communicating with the sump sub-chamber for conveying oil from the sump sub-chamber to the camcase, an oil drainage aperture in the camcase cover and communicating between the sump sub-chamber and one of the first and second sub-chambers, a plate engaging the camcase cover to further define the camcase cover chamber and including an aperture communicating through the plate with one of the first and second sub-chamber in the camcase cover chamber, a reed valve fixed relative to the plate and including a valve portion movable between positions closing and opening the aperture and being biased toward the closing position, and a breather cover including a wall engaging the plate to define therebetween a breather cover chamber which includes a series of serially connected sub-chambers including a first sub-chamber communicating, when the valve is in the opening position, through the aperture in the plate with the last mentioned one sub-chamber in the camcase cover chamber, and a last sub-chamber communicating with the atmosphere through an opening in the breather cover wall.

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First Claim