摘要:
An auxiliary valve actuating mechanism of an engine is provided. The engine includes a conventional valve actuating mechanism (200) and an auxiliary valve actuating mechanism (2002). The auxiliary valve actuating mechanism (2002) includes an auxiliary cam (2302), an auxiliary rocker-arm shaft (2052), an auxiliary rocker arm (2102), an eccentric rocker-arm shaft bush (188) and a shaft bush actuating mechanism (100). The eccentric rocker-arm shaft bush (188) is provided inside the shaft hole of the auxiliary rocker arm (2102). The auxiliary rocker-arm shaft (2052) is provided inside the eccentric rocker-arm shaft bush (188). The shaft center of the auxiliary rocker-arm shaft (2052) is biased from the shaft center of the eccentric rocker-arm shaft bush (188). One end of the auxiliary rocker arm (2102) constitutes a motion pair with an auxiliary cam (2302), and the other end is above the valve (300). The shaft bush actuating mechanism (100) actuates the eccentric rocker-arm shaft bush (188) to rotate between an operating position and a non-operating position. At the non-operating position, the rocking center line of the auxiliary rocker arm (2102) is away from the valve (300), and the auxiliary rocker arm (2102) is separated from the valve; and at the operating position, the rocking center line of the auxiliary rocker arm (2102) is close to the valve, the auxiliary rocker arm contacts with the valve, and the movement of the auxiliary cam is transmitted to the valve to generate the motion of the auxiliary valve. The auxiliary valve actuating mechanism is simple in structure, and easy to mount.
摘要:
A valve train assembly comprises: a rocker arm (2) comprising: a first body (10) supporting a first axle (24) on which a first roller (22a, 22b) for engaging a first rotatable cam surface (34, 36) is mounted, whereby at least part of the rocker arm (2) can be pivoted by at least the first rotatable cam surface (34, 36) acting on the first roller (22a, 22b) to move a valve (4) to cause a first valve even. The rocker arm (2) further comprises a second body (8) supporting a second axle (43) on which a further roller (26) for engaging a further rotatable cam surface (38) is mounted, whereby at least part of the rocker arm (10) can be pivoted by the further rotatable cam surface (38) to move the valve (4) to cause a second valve event. One of the first (10) and second (8) bodies is pivotally mounted with respect to the other of the first (10) and second (8) bodies. The rocker arm (2) is configurable in a first mode of operation in which one of the first and second valve events occurs and a second mode of operation in which both the first and second valve events occur or the other of the first and second valve events occurs. The rocker arm (2) further comprises a latching mechanism (40) for latching and unlatching the first (10) and second (8) bodies together and wherein which of the first and second modes the rocker arm (2) is configured in depends upon whether the first (10) and second (8) bodies are latched or are unlatched. The latching mechanism (40) comprises a latch member (80) moveable between a latched position wherein it latches the first (10) and second (8) bodies together and an unlatched position in which the first (10) and second (8) bodies are unlatched The valve train assembly further comprises a latching actuator (94) for moving the latch member (80) between the latched position and the unlatched position and wherein the latching actuator (94) comprises a rotatable shaft (96) attached to a biasing means (98), wherein rotating the rotatable shaft (96) from a first position to a second position causes the biasing means (98) to move the latch member (80) between the latched position and the unlatched position.
摘要:
The present invention provides a variable valve mechanism of an internal combustion engine, which includes a rocker arm that includes a roller arm including a roller that rotatably abuts against a cam and a side arm provided at a side of the roller arm and that drives a valve, and a switching device that includes a switching pin and a hydraulic chamber provided inside the rocker arm and that switches a drive state of the valve by displacing the switchingpin between a couplingposition at which the switching pin extends between the roller arm and the side armand a non-coupling position at which the switching pin does not extend between the roller arm and the side armbased on variations in hydraulic pressure in the hydraulic chamber. The switching pin is provided on an axis of the roller, and the hydraulic chamber is provided inside the roller arm.
摘要:
Die Erfindung betrifft einen variablen Ventiltrieb für ein Hubventil, insbesondere für ein Ladungswechselventil einer Brennkraftmaschine, das zwischen einer Schließ- und einer Öffnungsstellung mittelbar durch einen Nocken über einen Kipphebel periodisch bewegbar ist. Der variable Ventiltrieb (1) umfasst eine schaltbare Kipphebelanordnung zur Betätigung des Hubventils, aufweisend einen Übertragungskipphebel (10) und einen Ventilkipphebel (20), die auf verschiedenen Kipphebelachsen (13, 23), die jeweils parallel zur Nockenwellenachse sind, verschwenkbar gelagert sind. Der Ventilkipphebel (20) steht an einem ersten Ende (21) mit dem Hubventil in Wirkkontakt und weist an einem zweiten Ende (22) eine Rolle (26) auf. Der Übertragungskipphebel (10) steht an einem ersten Ende (11) mit einem Nocken (2) der Nockenwelle (3) in Eingriff und steht an einem zweiten Ende (12) über eine Konturfläche (16; 516) mit der Rolle (26) des Ventilkipphebels (20) in Wirkverbindung, derart, dass eine Kippbewegung des Übertragungskipphebels (10) eine korrespondierende Kippbewegung des Ventilkipphebels (20) erzeugt, bei der die Rolle (26) des Ventilkipphebels (20) auf der Konturfläche (16) abrollt. Der variable Ventiltrieb umfasst ferner eine Stelleinrichtung (30) zum Schalten der Kipphebelanordnung, mittels derer die Konturfläche (16; 516) um die Kipphebelachse (13) des Übertragungskipphebels (10) verdrehbar ist, um eine Verschiebung eines Abrollbereichs (a1, a2) der Rolle (26) des Ventilkipphebels (20) auf der Konturfläche (16; 516) zu erzeugen.
摘要:
An auxiliary valve actuating mechanism of an engine is provided. The engine includes a conventional valve actuating mechanism (200) and an auxiliary valve actuating mechanism (2002). The auxiliary valve actuating mechanism (2002) includes an auxiliary cam (2302), an auxiliary rocker-arm shaft (2052), an auxiliary rocker arm (2102), an eccentric rocker-arm shaft bush (188) and a shaft bush actuating mechanism (100). The eccentric rocker-arm shaft bush (188) is provided inside the shaft hole of the auxiliary rocker arm (2102). The auxiliary rocker-arm shaft (2052) is provided inside the eccentric rocker-arm shaft bush (188). The shaft center of the auxiliary rocker-arm shaft (2052) is biased from the shaft center of the eccentric rocker-arm shaft bush (188). One end of the auxiliary rocker arm (2102) constitutes a motion pair with an auxiliary cam (2302), and the other end is above the valve (300). The shaft bush actuating mechanism (100) actuates the eccentric rocker-arm shaft bush (188) to rotate between an operating position and a non-operating position. At the non-operating position, the rocking center line of the auxiliary rocker arm (2102) is away from the valve (300), and the auxiliary rocker arm (2102) is separated from the valve; and at the operating position, the rocking center line of the auxiliary rocker arm (2102) is close to the valve, the auxiliary rocker arm contacts with the valve, and the movement of the auxiliary cam is transmitted to the valve to generate the motion of the auxiliary valve. The auxiliary valve actuating mechanism is simple in structure, and easy to mount.
摘要:
Die Erfindung betrifft eine Übertragungsanordnung für einen mechanisch steuerbaren Ventiltrieb (2), die ein Übertragungsglied (13) aufweist, das derart ausgeführt ist, dass es direkt oder indirekt über Koppelmittel (6. 14, 16, 18) mit zumindest einem Gaswechselventil (4) in Wirkverbindung steht und das im Zylinderkopf mittels Lagermittel (22) beweglich gelagert ist, wobei das Übertragungsglied (13) desweiteren mit einer Nockenwelle (8) und einer Ventilhubverstelleinrichtung (25) in Wirkverbindung steht, derart, dass zumindest verschiedene Maximalhübe des Gaswechselventils (4) einstellbar sind, wobei die Ventilhubverstelleinrichtung (25) in dem Übertragungsglied (13) der Übertragungsanordnung (12) integriert ist.