Valve stop for engine with exhaust gas recirculation

摘要

A butterfly valve includes a body with a bore through which exhaust gas may flow and a valve member rotatably mounted within the bore for restricting flow through the bore. A stop extends into the bore to limit movement of the valve member and prevent the valve member from rotating to a closed position. The stop defines a restricted flow position at which the valve member is positioned between an open position and the closed position. An internal combustion engine utilizing the butterfly valve is also provided.

主权项

1. An internal combustion engine comprising: a plurality of combustion cylinders;
an intake air system for supplying air to the combustion cylinders; an exhaust gas system fluidly connected to the combustion cylinders, the exhaust gas system including an exhaust manifold, an exhaust gas outlet, and an exhaust restriction valve for controlling flow of exhaust gas from the exhaust manifold to the exhaust gas outlet, the exhaust restriction valve including:
a body with a bore through which exhaust gas may flow, the bore having a diameter,an elongated shaft extending across the bore;a valve member within the bore disposed on the elongated shaft for restricting flow through the bore, the valve member having a valve member diameter generally equal to diameter of the bore, the valve member being movable from a first open position at which flow through the bore is substantially unrestricted by the valve member towards a second closed position at which flow through the bore is substantially blocked, anda stop to prevent the valve member from moving to the second closed position, the stop defining a fixed third restricted flow position with the valve member positioned between the first open position and the second closed position, the stop being a pin fixed within and having an end projecting into the bore to block movement of the valve member by engaging the valve member at the third restricted flow position to prevent movement of the valve member to the second closed position, the pin being generally parallel to the elongated shaft and the end being tapered; and an exhaust gas recirculation system for recirculating exhaust gas from the exhaust gas system to the intake air system, the exhaust gas recirculation system including an exhaust gas recirculation control valve for controlling flow of exhaust gas from the exhaust manifold to the intake air system.