Charge motion control valve seal and method of assembly thereof

Abstract

In an intake manifold with a charge motion control valve (CMCV), there is a gap between the flapper valve and the wall of the intake runner. Although the gap is kept as small as possible, it cannot be eliminated due to the manufacturing tolerances and temperature variations that the intake manifold is subjected to to prevent binding of the flapper valves. Some airflow detours through the gap, resulting in undesirable hydrodynamics. Disclosed herein is a seal positioned to rest lightly on the flapper valve close to the gap such that the gap is substantially sealed when moderate force is applied on the CMCV such that actuation torque is minimally affected. 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 extending from the press-in-place portion to block 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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