Abstract:
Ein variabler Ventiltrieb 2 zur Betätigung eines Ventils umfasst einen schwenkbar um eine Schwenkachse (24) gelagerten Schwenkrahmen (80). Der Ventiltrieb umfasst weiter einen Schwenktrieb (90) zum Schwenken des Schwenkrahmens (80) um die Schwenkachse (24) mit einem Stellmotor (92) und einem Schwenk-Getriebe (94), welches Schwenk-Getriebe (94) durch den Stellmotor (92) zum Verstellen des Schwenkrahmens (80) angetrieben wird. Das Schwenk-Getriebe (94) umfasst ein Schneckengetriebe (98a) mit einer Verstellschnecke (98), wobei die Verstellschnecke (98) über eine Welle (99) des Stellmotors (92) zum Verstellen des Schwenkrahmens (80) angetrieben wird. Die Welle (99) des Stellmotors (92) ist derart an die Verstellschnecke (98) gekoppelt, um eine Rotationsbewegung von der Welle (99) zur Verstellschnecke (98) zu übertragen, in Bezug auf Axialkräfte jedoch ein Spiel zwischen Welle (99) und Verstellschnecke (98) zu erlauben.
Abstract:
The invention provides an internal combustion engine comprising - a cylinder (301, 302) comprising a piston connected to a rotatable crankshaft, - an exhaust guide (501, 502) being arranged to guide a gas flow from the cylinder (301, 302), - an adjustable flow restriction element (601, 602) arranged to restrict the flow through the exhaust guide (501, 502), - an exhaust valve (7) arranged to control a communication between the cylinder (301, 302) and the exhaust guide (501, 502), and - an exhaust valve actuation assembly (8) for actuating the exhaust valve (7) so as to perform in each of a plurality of cycles of the cylinder (301, 302) an exhaust valve actuation sequence, - characterized in that the exhaust valve actuation assembly (8) is adapted to control the commencement of the exhaust valve actuation sequence to occur selectively at any crankshaft angle within a non-zero crankshaft angle interval.
Abstract:
A method of providing a rocker arm set for a valvetrain includes providing a first rocker arm configured as a switching rocker arm for a first intake valve, and providing a second rocker arm configured as a fixed rocker arm for a second intake valve, the second rocker arm operating in a normal Otto cycle mode. The first rocker arm operates in a late intake valve closing (LIVC) mode where the first rocker arm is configured to close the first intake valve later than the second intake valve.
Abstract:
A valvetrain for an internal combustion engine of the type that has a combustion chamber, a moveable valve having a seat formed in the combustion chamber, and a camshaft includes a rocker arm assembly, a pivot providing a fulcrum for a rocker arm of the rocker arm assembly, and a latch assembly. An electrical device mounted to the rocker arm assembly receives power or communicates through a circuit that includes an electrical connection formed by abutment between surfaces of two distinct parts. The rocker arm assembly is operative to move one of the two abutting surfaces relative to the other in response to actuation of the cam follower. Forming an electrical connection through abutting surfaces that are free to undergo relative motion may reduce or eliminate the need to run wires to a mobile portion of the rocker arm assembly.
Abstract:
A valvetrain for an internal combustion engine of the type that has a combustion chamber, a moveable valve having a seat formed in the combustion chamber, and a camshaft includes a rocker arm assembly, a pivot providing a fulcrum for a rocker arm of the rocker arm assembly, and a latch assembly. The latch assembly includes a latch pin mounted on the rocker arm, an electromechanical actuator mounted to the pivot, and a mechanical linkage between the latch pin and the electromechanical actuator. The electromagnetic actuator may be packaged adjacent to or within the pivot to provide a compact design that does not require wiring to the rocker arm.
Abstract:
An internal combustion engine includes a cylinder block that defines a cylinder and a cylinder head mounted to the cylinder block. A reciprocating piston is arranged inside the cylinder for compressing an air and fuel mixture at a geometric compression ratio of at least 10:1. A crankshaft is arranged in the cylinder block and rotated by the piston. An intake valve is operatively connected to the cylinder head and controls delivery of air to the cylinder for combustion therein. A mechanism provides a constant peak lift of the intake valve over an angle of rotation of the crankshaft that is at least 5 degrees, i.e., an extended dwell at peak lift. A multi-stage boosting system having first and second gas compressors is selectively controlled to pressurize air that is received from the ambient for delivery to the cylinder. A vehicle having such an engine is also disclosed.
Abstract:
A latch assembly comprises a hollow bore comprising a cylindrical inner surface. A latch comprises a base abutting the cylindrical inner surface. A body comprises a first end adjoining the base, a distal end distanced from the first end, and a groove extending from the distal end towards the first end. A sleeve surrounds the body and is fitted to the cylindrical inner surface. The sleeve comprises an opening, and a ball aligns the opening with the groove.
Abstract:
A switchable finger follower, including an inner lever and an outer lever. The outer lever is mounted for pivoting movement to the inner lever. A coupling device is located on one of the inner or outer levers and has a locking pin arranged to move between a locking position, in which the inner and outer levers are connected together for movement in an activation direction, and an unlocked position, in which the inner lever is pivotable relative to the outer lever. A coupling projection is located on the other of the inner or outer lever. The locking pin engages beneath the projection in the locking position, and the locking pin includes a flat at a defined flat height that contacts the coupling surface in the locking position and is selected from a number of locking pins having different flat heights to set a desired mechanical coupling device lash.
Abstract:
Es betrifft einen mechanisch steuerbarer Ventiltrieb mit einem Gaswechselventil (4), wobei dem Gaswechselventil (4) eine Übertragungsanordnung (5) zugeordnet ist, wobei die Übertragungsanordnung (5) eine Zwischenhebelanordnung (6) und eine Schlepphebelanordnung (8) aufweist, wobei ein Zwischenhebel (12) der Zwischenhebelanordnung (6) eine Arbeitskurve (24) zur Wirkverbindung mit einem Schlepphebel (28) der Schlepphebelanordnung (8) aufweist, wobei der Zwischenhebel (12) ein erstes Rollenorgan (14) aufweist, das in Wirkverbindung mit einer Umfangskontur (16) einer Nockenwelle (18) steht und wobei der Zwischenhebel (12) ein zweites Rollenorgan (20) aufweist, das auf einer Achse (22) drehbar gelagert ist, derart, dass das zweite Rollenorgan (20) mit einer Ventilhubverstelleinrichtung (10) in Wirkverbindung steht, derart, dass verschiedene Ventilhubpositionen einstellbar sind, wobei Federmittel vorgesehen sind, die auf die Zwischenhebelanordnung (6) angreifen und wobei Führungsmittel für die Zwischenhebelanordnung vorgesehen sind, wobei die Führungsmittel (36) aus einer Kulisse (34) bestehen, auf die mindestens ein Führungsrollenorgan, das im Bereich des zweiten Rollenorgans (20) vorgesehen ist, angreift.