-formation in such an engine and such engine
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United States of America Patent
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Oct 28, 2014
Issued Date -
N/A
app pub date -
May 12, 2009
filing date -
May 13, 2008
priority date (Note) -
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Abstract
For reducing the NOx-emission of a large sized two stroke diesel engine having at least one combustion room (3), a reciprocating piston (4) and an exhaust opening (12) controlled by an exhaust valve (13) at each work cyclus a small volume of burnt gas is retained in the combustion room (3) and so added to the fresh air for the next combustion. For achieving this retention of burnt gas the underside of the valve disc (15) off the exhaust valve (13) is provided with a shallow concave face (17) building a basin-like collection room, whose depth is within a range of 2-10% of the outer diameter of the valve disc (15).
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