Abstract:
A cam can rotate on a camshaft of an internal combustion engine. A rocker arm that actuates a valve of the internal combustion engine can include a rocker pivot connection point located on a distal side of a valve component from a proximate end of the rocker arm that is deflected by action of the cam. The rocker arm can include a contact point located between the rocker pivot point and the proximate end. The contact point can act on the valve component to actuate the valve. The rocker pivot connection point can be translated such that it is closer to or further from the cam. This translation can be used to vary valve lift and/or valve timing. The cam can have a three-dimensional profile to provide different actuation distance of the rocker arm. Systems, methods, and articles of manufacture consistent with one or more of these features are described.
Abstract:
Die Erfindung betrifft einen Nockenverstellmechanismus (1) mit einer eine Rotationsachse (3) umfassenden Welle (2), wie einer Nockenwelle, einem wellenfesten Auslassnocken, einem Einlassnocken (4), der innerhalb eines festgelegten Bereichs drehbar auf der Welle (2) gelagert ist, und zumindest einem Fliehgewicht (12), wobei das Fliehgewicht (12) derart in Wirkbeziehung mit dem Einlassnocken (4) steht, dass eine Auslenkung des Fliehgewichts (12) bei einer entsprechenden Rotationsgeschwindigkeit der Welle (2) zu einem Verstellen des Einlassnockens (4) relativ zum Auslassnocken führt, wobei ein fliehkraftabhängig in seiner Blockierrichtung verstellbarer Freilauf (5) zwischen den Einlassnocken (4) und der Welle (2) geschalten ist. Die Erfindung betrifft auch eine Einzylinder-Verbrennungskraftmachine mit einer einzelnen, obenliegenden Nockenwelle für ein Motorrad mit einem solchen Nockenverstellmechanismus.
Abstract:
Die Erfindung betrifft einen Nockenverstellmechanismus (1) mit einer eine Rotationsachse (3) umfassenden Welle (2), wie einer Nockenwelle, einem wellenfesten Auslassnocken, einem Einlassnocken (4), der innerhalb eines festgelegten Bereichs drehbar auf der Welle (2) gelagert ist, und zumindest einem Fliehgewicht (12), wobei das Fliehgewicht (12) derart in Wirkbeziehung mit dem Einlassnocken (4) steht, dass eine Auslenkung des Fliehgewichts (12) bei einer entsprechenden Rotationsgeschwindigkeit der Welle (2) zu einem Verstellen des Einlassnockens (4) relativ zum Auslassnocken führt, wobei ein fliehkraftabhängig in seiner Blockierrichtung verstellbarer Freilauf (5) zwischen den Einlassnocken (4) und der Welle (2) geschalten ist. Die Erfindung betrifft auch eine Einzylinder-Verbrennungskraftmachine mit einer einzelnen, obenliegenden Nockenwelle für ein Motorrad mit einem solchen Nockenverstellmechanismus.
Abstract:
Dual-lobed cams mounted on the intake camshaft (26) of a diesel engine selectively retard timing of the intake valve closure. The purpose of retarding timing of the intake valves is to retard valve closing sufficiently to shorten the effective compression strokes of the pistons and thus reduce the effective compression ratio. This occurs when the intake valves remain open past piston bottom dead center for a desired period into the normal compression stroke phase of engine operation. This reduces compression pressures so that combustion temperatures are reduced and exhaust emissions, primarily NOx, may be thus limited under conditions of warmed-up engine operation. Dual-lobed cams (10) may also be employed to retard timing of the intake valve opening to throttle admitted air during cold running conditions to effect higher in-cylinder charge temperatures to reduce hydrocarbon and white smoke emissions due to poor ignition and incomplete combustion.
Abstract:
A crankshaft (13) is rotated in a forward direction until a crank angle reaches a reverse rotation starting range after a stop and before a start-up of an engine (10), and the crankshaft (13) is rotated in a reverse direction until the crank angle goes over a start-up intake range from the reverse rotation starting range and reaches a start-up ignition range at the start-up of the engine (10). When the crank angle is in the start-up intake range, a fuel-air mixture made of fuel and air that is injected by an injector is introduced into a combustion chamber (31 a) from an intake passage (22) through an intake port (21). Further, when the crank angle is in the start-up ignition range, the fuel-air mixture in the combustion chamber (31 a) is ignited by an ignition plug.
Abstract:
Dual-lobed cams mounted on the intake camshaft (26) of a diesel engine selectively retard timing of the intake valve closure. The purpose of retarding timing of the intake valves is to retard valve closing sufficiently to shorten the effective compression strokes of the pistons and thus reduce the effective compression ratio. This occurs when the intake valves remain open past piston bottom dead center for a desired period into the normal compression stroke phase of engine operation. This reduces compression pressures so that combustion temperatures are reduced and exhaust emissions, primarily NOx, may be thus limited under conditions of warmed-up engine operation. Dual-lobed cams (10) may also be employed to retard timing of the intake valve opening to throttle admitted air during cold running conditions to effect higher in-cylinder charge temperatures to reduce hydrocarbon and white smoke emissions due to poor ignition and incomplete combustion.
Abstract:
A cam follower for operable attachment to a valve lifter assembly for use with a variable cam lobe camshaft in a variable valve timing system includes a housing with a central cavity and a mushroom head with a stem pivotably connected to the housing in the central cavity, the mushroom head having a radiused surface for contacting a cam lobe surface. The cam follower is used in combination with a variable cam surface of an axially displaceable camshaft to obtain improvements in idling speed and volumetric efficiency.
Abstract:
In a cam housing structure for a three-dimensional cam including: plural intake side supporting parts rotatably supporting an intake side camshaft from above; and plural exhaust side supporting parts rotatably supporting an exhaust side camshaft from above at an upper part of a cylinder head, any one of the supporting parts of the intake side supporting parts or the exhaust side supporting parts is coupled to two or more pieces of the other supporting parts via reinforcing members.