Noise silencer for vehicle engine intake system

Details Noise silencer for vehicle engine intake system Noise silencer for vehicle engine intake system

1999-06-14

2000-12-05

Wolfe, Willis R.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

F02M 3512

Patent

active

061552240

ABSTRACT:
A noise silencer for reducing noise in an intake passage in an intake system has a parabolic portion for collecting noise, a noise accumulation room communicating with the intake passage through a communication passage and a noise discharge pipe communicating with an outside space. A noise collection valve is provided in the communication passage. When sound pressure in the intake passage is positive, i.e., larger than pressure inside the noise accumulation room, the noise collection valve opens the communication passage. As a result, a positive sound pressure portion of low-frequency noise is collected into the noise accumulation room and is discharged outside the intake system. Thus, the noise silencer effectively reduces low-frequency noise in the intake passage and requires less mounting space.

REFERENCES:
patent: 3712416 (1973-01-01), Swanson et al.
patent: 4538556 (1985-09-01), Takeda
patent: 5571239 (1996-11-01), Kameda et al.
patent: 5572966 (1996-11-01), Doddy et al.

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