Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1994-09-30
1997-05-13
McMahon, Marguerite
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
12318457, F02B 7518
Patent
active
056282877
ABSTRACT:
A noise attenuating device is disclosed combined with the air induction system of a multicylinder internal combustion piston engine, which includes an expansion chamber connected into the air induction system with an inlet and outlet. A first and a second tuning tube is concentric with the inlet and outlet, respectively, and are axially movable relative each other to assume either an underlapped or an overlapped configuration. The tubes are relatively driven axially to be shifted between the overlapped configuration at low engine speeds (under 2500 rpm) and an underlapped configuration at higher engine speeds to more effectively attenuate the characteristic harmonic orders of induction noise at these respective engine speed ranges.
REFERENCES:
patent: 4759320 (1988-07-01), Fujii et al.
patent: 4934343 (1990-06-01), Lee
patent: 4936413 (1990-06-01), Lee
patent: 5092284 (1992-03-01), Yamada
patent: 5092285 (1992-03-01), Beaber
patent: 5377629 (1995-01-01), Brackett et al.
patent: 5424494 (1995-06-01), Houle et al.
Brackett Stephen E.
Doddy David C.
McMahon Marguerite
Siemens Electric Limited
Wells Russel C.
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