Means silencing suction noise in internal combustion engines
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsShoichi Chiba, Kunio Konuma, Hirofumi Ishizaki
Life of this patent
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Abstract
A device for silencing suction noises wherein a suction passage making a combustion chamber of an engine and an expansion chamber communicate with each other through a suction valve, is also provided with a fuel feeding device interposed in the passage. A suction pipe makes the expansion chamber communicate with the atmosphere, and has a substantially constant cross-sectional area over its entire length. The expansion chamber is predetermined to have a cross-sectional area larger than that of the suction passage and to have a substantial volume. The ratio of the suction pipe length to the suction passage length is selected to be in a range of 0.7 to 1.4.
Claims3
Apparatus for silencing suction noises of an internal combustion engine, comprising:
- at least one suction passage including a suction valve of said engine, a suction path conduit, and portions of a fuel feeding device for said engine;
- at least one suction pipe of substantially constant cross section having one end thereof communicating with the atmosphere;
- an expansion chamber interposed between and communicating with said suction passage and said suction pipe;
- said expansion chamber having a cross-sectional area larger than that of said suction passage, and a substantial volume;
- the ratio of the length l of said suction pipe to the length L of said suction passage is in a range of 0.7 to 1.4;
- a resonator provided above said suction passage so as to communicate with said passage;
- each combustion chamber of a multicylinder engine being made to communicate with said expansion chamber through an independent suction passage provided with a fuel feeding device;
- and
- each said independent suction passage being provided with its own said resonator.
Dependencies are inferred from the claim text.