| 摘要 |
PURPOSE:To increase the secondary air volume without causing vibration or noise during low engine revolution by producing resonance under a certain condition in a resonance chamber disposed downstream from a ckeck valve in a conduit pipe which provides communication between the atmosphere and the exhaust system via said check valve. CONSTITUTION:Fresh air is introduced from an air cleaner 1 through an air intake manifold 2 into the combustion chambers of the engine 9. Meantime, the exhaust from respective combustion chambers is led through an exhaust manifold 3 into an exhaust tube 6 equipped with an oxidizing catalyst 7 and a silencer 8. In this connection, one end of a branch pipe 10 is connected to the exhaust manifold 3, and the other end thereof to a resonance chamber 11, where a check valve 12 is so set that it can combine the resonance chamber 11 through a connecting tube 13 to the air cleaner 1. And the resonance chamber 11 is so made that it may resonate with the exhaust pulse frequency corresponding to the minimum pressure amplitude of the exhaust pulsation in the exhaust system.
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