Cylinder head cavity ventilation for camless engine
AssigneeGM Global Technology Operations LLC
InventorThomas A. Spix
Life of this patent
Estimating the term…
Abstract
An engine assembly may include an engine structure, intake and exhaust valves, hydraulically actuated valve lift mechanisms, and a valvetrain ventilation line. The engine structure may define a combustion chamber, intake and exhaust ports in communication with the combustion chamber, a crankcase, and a valvetrain chamber isolated from the crankcase. The intake valve may be located in the intake port and the exhaust valve may be located in the exhaust port. The hydraulically actuated valve lift mechanisms may be supported on the engine structure within the valvetrain chamber and engaged with the intake and exhaust valves. The valvetrain ventilation line may be in communication with the valvetrain chamber and may provide communication between the valvetrain chamber and the intake port.
Claims20
An engine assembly comprising:
- an engine structure defining a combustion chamber, intake and exhaust ports in communication with the combustion chamber, a crankcase, and a valvetrain chamber isolated from the crankcase;
- an intake valve located in the intake port;
- an exhaust valve located in the exhaust port;
- hydraulically actuated valve lift mechanisms supported on the engine structure within the valvetrain chamber and engaged with the intake and exhaust valves;
- and
- a valvetrain ventilation line in communication with the valvetrain chamber and providing communication between the valvetrain chamber and the intake port.
An engine assembly comprising:
- an engine block defining a combustion chamber and a crankcase;
- a cylinder head coupled to the engine block and defining intake and exhaust ports in communication with the combustion chamber;
- a valve cover coupled to the cylinder head, the cylinder head and the valve cover defining a valvetrain chamber isolated from the crankcase;
- an intake valve located in the intake port;
- an exhaust valve located in the exhaust port;
- hydraulically actuated valve lift mechanisms supported on the cylinder head within the valvetrain chamber and engaged with the intake and exhaust valves;
- a crankcase ventilation system in communication with the crankcase and providing communication between the crankcase and the intake port;
- and
- a valvetrain ventilation system in communication with the valvetrain chamber and providing communication between the valvetrain chamber and the intake port.
Dependencies are inferred from the claim text.