Internal combustion engine equipped with intake silencer

An internal combustion engine comprising:

• an intake system having an intake silencer with an expansion chamber formed therein;
• and
• an air passage structure forming an air passage and having:
• a passage wall isolating the air passage from the expansion chamber,
• a first portion disposed within the expansion chamber with an open air inlet end through which air from the expansion chamber flows into the air passage structure,
• a second portion extending out of the expansion chamber toward a throttle body with an air outlet end through which air from the air passage structure flows out of the expansion chamber toward combustion chambers, and
• a communication opening between the air passage and the expansion chamber disposed on the passage wall along the first portion;
• wherein the communication opening allows the expansion chamber to communicate with the air passage such that the expansion chamber additionally functions as a resonance chamber.

An intake system for an engine, said intake system comprising:

• an intake silencer having an expansion chamber formed therein;
• and
• an air passage structure disposed within the expansion chamber forming an air passage and having:
• a passage wall isolating the air passage from the expansion chamber,
• an open air inlet end through which air from the expansion chamber flows into the air passage structure,
• an air outlet end through which air from the air passage structure flows out of the expansion chamber toward combustion chambers, and
• a communication opening between the air passage and the expansion chamber disposed on the passage wall;
• wherein the communication opening allows the expansion chamber to communicate with the air passage such that the expansion chamber additionally functions as a resonance chamber.