Choke device for an internal combustion engine intake system
AssigneeMagneti Marelli Powertrain S.p.A.
InventorsNazario Bellato, Sandro Sirani, Marcello Colli, Eugenio Dragoni
Life of this patent
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Abstract
A choke device for an intake system of an internal combustion engine; the choke device has at least one choke body fitted movably inside an intake conduit, and an actuating device for moving the choke body to and from a work position in which the choke body reduces the cross section of the intake conduit; and the actuating device has a filiform actuating member made of a shape-memory material that changes shape when subjected to physical external stress, and having a first portion embedded in the choke body, and a second portion located outside the choke body and secured mechanically to a fixed part.
Claims27
1) A choke device (13) for an intake system of an internal combustion engine (1);
- the intake system comprising at least one intake manifold (3), and a number of intake conduits (9), each of which connects the intake manifold (3) to at least one cylinder (2) of the internal combustion engine (1);
- the choke device (13) comprising at least one choke body (15) housed inside an intake conduit (9), and an actuating device (17) for setting the choke body (15) to a work position in which the choke body (15) reduces the cross section of the intake conduit (9);
- the choke device (13) being characterized in that
- the actuating device (17) comprises at least one filiform actuating member (23) made of a shape-memory material that changes shape when subjected to physical external stress, and comprising a first portion (24) embedded in the choke body (15), and a second portion (25) located outside the choke body (15) and secured mechanically to a fixed part;
- and
- the choke body (15) is deformable elastically to comply with the reduction in length of the actuating member (23).
24) A choke device (13) for an intake system of an internal combustion engine (1);
- the intake system comprising at least one intake manifold (3), and a number of intake conduits (9), each of which connects the intake manifold (3) to at least one cylinder (2) of the internal combustion engine (1);
- the choke device (13) comprising at least one choke body (15) housed inside an intake conduit (9), and an actuating device (17) for setting the choke body (15) to a work position in which the choke body (15) reduces the cross section of the intake conduit (9);
- the choke device (13) being characterized in that
- the actuating device (17) comprises at least one U-shaped filiform actuating member (23) made of a shape-memory material that changes shape when subjected to physical external stress, and comprising a first portion (24) embedded in the choke body (15), and a second portion (25) located outside the choke body (15) and secured mechanically to a fixed part.
25) A choke device (13) for an intake system of an internal combustion engine (1);
- the intake system comprising at least one intake manifold (3), and a number of intake conduits (9), each of which connects the intake manifold (3) to at least one cylinder (2) of the internal combustion engine (1);
- the choke device (13) comprising at least one choke body (15) housed inside an intake
- conduit (9), and an actuating device (17) for setting the choke body (15) to a work position in which the choke body (15) reduces the cross section of the intake conduit (9);
- the choke device (13) being characterized in that the actuating device (17) comprises at least one filiform actuating member (23) made of a shape-memory material that changes shape when subjected to physical external stress, and comprising a first portion (24) embedded in the choke body (15), and a second portion (25) located outside the choke body (15) and secured mechanically to a fixed part;
- and
- the choke body (15) comprises at least one ventilation hole (29) formed at the actuating member (23) to expose part of the actuating member (23) to the fresh-air stream inside the intake conduit (9).
Dependencies are inferred from the claim text.