Charge Motion Control Valve Seal and Method of Assembly

Abstract

In an intake manifold that has charge-motion-control valves (CMCVs), a gap exists between the flapper valves and the wall of the intake runners. Although the gap is maintained as small as practical, it cannot be eliminated because manufacturing tolerances and temperature variations to which the intake manifold is subjected must be accommodated to prevent binding of the flapper valves. Some flow makes an end run through the gap leading to undesirable fluid mechanics. Disclosed herein is a seal that is positioned to rest gently upon the flapper valve near the gap such that the gap is substantially sealed off while applying a modest force on the CMCV so that the actuation torque is minimally impacted. The seal has a press-in-place portion inserted into a pocket formed in the manifold to hold it in place and a lip portion that extends out from the press-in-place portion to obstruct the gap.

Description

technical field

[0001] The present disclosure relates to charge motion control in the intake duct of an internal combustion engine. Background technique

[0002] More than a quarter of a century ago, spark ignition engines tended to have only one intake valve. To improve intake and exhaust performance, and thus obtain peak power from an engine of a given displacement, two intake valves have become common in engine production. Although two intake valves have been found to provide less mixing motion at low torque conditions than a single intake valve to the detriment of idle quality. If the cross-sectional area of ​​the air passage is reduced under low torque conditions, the velocity of the airflow through this reduced area section is increased. A valve placed in a conduit in the intake manifold may remain open under high torque operating conditions, but move to a blocked position under low torque operating conditions. In addition, the shape of the valve is properly designe...

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