Secondary air supply for engine exhaust system
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United States of America Patent
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N/A
Issued Date -
Feb 23, 2006
app pub date -
Aug 17, 2005
filing date -
Aug 17, 2004
priority date (Note) -
Abandoned
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Abstract
A chain chamber of an engine, which accommodates a cam chain for driving a camshaft, is formed between a first cylinder and a second cylinder aligned in the direction along the camshaft. A first-cylinder valve chamber and a second-cylinder valve chamber each accommodate a corresponding valve for supplying secondary air to an exhaust system. The first and second chambers overlap the chain chamber and lie adjacent to each other above the chain chamber. The first-cylinder and second-cylinder valve chambers have first and second valve chamber openings, respectively. A first and a second valve chamber cover for opening and closing the respective valve chamber openings are integrally formed together. This construction reduces the number of engine parts associated with a secondary air system and simplifies the sealing structure of secondary air introduction hoses and cover members.
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