| 摘要 |
1. An intake system for an internal combustion engine, the system comprising resonance chambers provided to utilise oscillations for the purpose of obtaining a moderate charge, in which one wall of each chamber is formed by a piston (4) displaceable in dependence on the engine's speed so as to alter the volume of the respective resonance chamber and thus the resonance frequency, characterized in that the piston (4) is solely displaceable, against the bias of a spring (5), by the vacuum which prevails in an associated header (1) forming the resonance chamber and which acts on the piston, and in that the piston (4) is attached to a dash pot (6, 7, 8) rendering the piston sluggish to an extent sufficient for it not to react to the oscillations in the resonance chamber.
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