Patent ID: 7552710
Filing Date: 2009-06-30
Classification: F02B,F02D,F02M,Y02T,Y10T

Abstract:
1. A variable geometry intake manifold for an internal combustion engine; the intake manifold comprises: at least one intake pipe which connects the intake manifold to at least one cylinder of the internal combustion engine; and a choking system for varying the geometry of the intake manifold and comprising at least one choke valve provided with a choke body, which is arranged within the intake pipe and is turnably mounted about an axis of rotation; the intake manifold has the choke valve that integrates therein a pair of mechanical stoppers, which determine the location respectively of an active position and of a home position of the choke body, wherein each stopper comprises an abutment tooth that is mobile arranged parallel and staggered with respect to an axis of rotation, and is connected to the choke body, and a matching element, which is fixed, connected to a fixed valve body of the choke valve, and arranged along the trajectory of movement of the corresponding abutment tooth to stop the movement of the corresponding abutment tooth and therefore of the choke body, wherein the choke body has on each opposite side a cylindrical expansion, which is inserted in a corresponding cylindrical seat obtained in the choke valve to define some bearings that guide the rotation of the choke body about the axis of rotation, wherein the abutment teeth of each stopper rise from its cylindrical expansion and the matching element obtained within the cylindrical seat, and wherein the two matching elements of the two stoppers have a single circular crown portion obtained within the cylindrical seats.