Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Reexamination Certificate
2005-10-18
2005-10-18
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
C123S184360, C123S184440, C123S184490
Reexamination Certificate
active
06955149
ABSTRACT:
A simplified variable intake manifold is disclosed for use with an internal combustion engine. The manifold utilizes a single valve actuator to vary the resonant frequency of a pair of plenums. The two plenums are joined by first and second communication passages of differing lengths connected to provide cross flow between two plenums. Each plenum has an inlet for receiving intake air from a throttle body and a group of runners adapted for connection with a like group of engine cylinders to direct inlet air from the plenums to combustion chambers of the cylinders. A control valve having an elongated shaft extends through the first and second communication passages and includes separate blades rotatable with the shaft to open or close the passages to provide at least three modes of tuning of the plenums. A stepper motor or other suitable device acts upon the shaft to rotate the blades within the communication passages.
REFERENCES:
patent: 4549506 (1985-10-01), Rush et al.
patent: 5638785 (1997-06-01), Lee
patent: 6260528 (2001-07-01), Pringle et al.
Christie Mark J.
Frank Richard M.
DeVries Christopher
General Motors Corporation
Kamen Noah P.
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