Intake system with noise reduction structure

Details Intake system with noise reduction structure Intake system with noise reduction structure

1998-12-14

2000-04-11

McMahon, Marguerite

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

F02B 7518

Patent

active

06047677&

ABSTRACT:
An intake system for an engine includes an air duct for inducing external air, a surge tank for suppressing pulsation of the induced external air and supplying the air to a combustion chamber of the engine, and a silencer system disposed between the air duct and the surge tank to reduce noise generated during an expansion stroke within a combustion chamber and backwardly transmitted to the intake system. The silencer system has a first tube connecting the air duct and the surge tank, a second tube separated from the first tube and connecting the air duct and the surge tank, and a device for varying a length of the second tube in accordance with an engine RPM such that a sound frequency of the noise passing through the second tube has a phase opposite to that passing through the first tube, whereby the sound frequencies are offset when combined at the air duct.

REFERENCES:
patent: 4862840 (1989-09-01), Matsunaga et al.
patent: 5309883 (1994-05-01), Pischke
patent: 5628287 (1997-05-01), Brackett et al.
patent: 5787851 (1998-08-01), Sakurai et al.
patent: 5813380 (1998-09-01), Takahashi et al.

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