Internal combustion engine with breather system

Details Internal combustion engine with breather system Internal combustion engine with breather system

2011-06-14

2011-06-14

McMahon, M. (Department: 3783)

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

Reexamination Certificate

active

07958875

ABSTRACT:
An internal combustion engine including a valve system and a breather system. The valve system includes a camshaft having intake cams and exhaust cams. The intake cams open and close intake valves, and the exhaust cams open and close exhaust valves. The breather system includes an upstream-side breather chamber and a downstream-side breather chamber. Blow-by gas flows into the upstream-side breather chamber through a chain chamber. The down-stream side breather chamber is provided in the camshaft, and also formed of a through hole constituted of a plurality of hole portions. The hole portions have different sizes and are aligned in the axial direction. The through hole opens to the chain chamber at a first shaft end portion of the camshaft, and also opens to the down-stream side breather chamber at a second shaft end portion of the camshaft. The down-stream side breather chamber is formed of a cam holder.

REFERENCES:
patent: 4651704 (1987-03-01), Sekiguchi
patent: 6758197 (2004-07-01), Korenjak et al.
patent: 7717101 (2010-05-01), Beetz et al.
patent: 2002/0083933 (2002-07-01), Schmid et al.
patent: 2002/0174846 (2002-11-01), Ashida et al.
patent: 2007/0175458 (2007-08-01), Hochmayr et al.
patent: 2007/0215075 (2007-09-01), Hutter et al.
patent: WO-2005/005793 (2005-01-01), None

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