| US 7,552,710 B2 | ||
| Variable geometry intake manifold for an internal combustion engine | ||
| Federico Lancioni, Sangemini (Italy); Michele Pecora, Potenza (Italy); and Stefano Fornara, Modena (Italy) | ||
| Assigned to Magneti Marelli Powertrain S.p.A., Corbetta (Italy) | ||
| Filed on Oct. 05, 2007, as Appl. No. 11/973,072. | ||
| Claims priority of application No. 06425680 (EP), filed on Oct. 05, 2006. | ||
| Prior Publication US 2008/0127929 A1, Jun. 05, 2008 | ||
| Int. Cl. F02D 9/10 (2006.01) | ||
| U.S. Cl. 123—336 [123/337; 123/308; 123/432; 251/286; 251/288] | 17 Claims |
| 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.
|