摘要:
An internal combustion piston engine based on a four-stroke process, including a crankcase in which at least one cylinder/piston assembly is arranged, the piston being guided by a connecting rod connected to a crankshaft. At least one cylinder head closes the cylinder, each of whose intake and exhaust channels are controlled by at least one intake valve and one exhaust valve (13, 13a). The intake and exhaust valves (13, 13a) are actuable by a rocker arm (5) or a finger lever driven by a camshaft (1) through intake and exhaust cams (2). The rocker arms or finger levers are guided on at least one axle (6). A brake control device is provided which includes, in the region of the base circle of the exhaust cam (2), at least one additional cam (1) for an additional opening of at least one of the exhaust valves (13, 13a). A control element (12, 12a) is installed between the rocker arm (5) or finger lever and the exhaust valve or valves (13, 13a), which control element (12, 12a) can be connected to the pressurized oil circulation system of the internal combustion piston engine and whose length can be varied, so that the additional cam (3) is active during a braking operation and inactive during a pure engine operation. The control element (12) is arranged in a bridge (11) that is associated with a plurality of exhaust valves (13, 13a).
摘要:
A valve actuation mechanism for an internal combustion engine includes rockers moved by a camshaft, each rocker being adapted to exert a valve opening force on at least a portion of a opening actuator of each cylinder, via an activation piston of the rocker movable with respect to the rocker under action of a fluid pressure raise in a chamber, from a first position to a second position, in which a cam follower of the rocker is adapted to read at least one auxiliary valve lift sector of a cam of the camshaft so as to perform an engine operating function. Each rocker includes a valve for releasing fluid from the chamber, wherein the valve actuation mechanism includes, for each rocker, a stopper fast with a housing of the engine and adapted to exert, on a member of the rocker, a variable force for opening the fluid releasing valve.
摘要:
The present invention provides a variable valve mechanism of an internal combustion engine which includes a main arm that is capable of swinging and that drives a valve when swinging, a first sub arm that is provided on one side in the lateral direction of the main arm and that swings when driven by a first cam, a second sub arm that is provided on the other side in the lateral direction of the main arm and that swings when driven by a second cam, and a switch device that performs switching between a first coupled state where only the first sub arm of the first and second sub arms is coupled to the main arm, and a second coupled state where only the second sub arm of the first and second sub arms is coupled to the main arm.
摘要:
An oil control valve assembly for an engine is provided that has a control valve with a valve body, and a manifold that defines a control passage in fluid communication with a valve lift switching component and an exhaust passage for exhausting fluid from the valve. The control valve is controllable to selectively direct fluid from a supply source to the control passage to actuate the valve lift switching component. An elongated tubular member is positioned adjacent the engine component and is operatively connected to the exhaust passage such that fluid flows from the exhaust passage to the elongated tubular member and through the elongated tubular member onto the engine component.
摘要:
An auxiliary valve actuating mechanism of an engine includes a first valve actuating mechanism and an auxiliary valve actuating mechanism. The auxiliary valve actuating mechanism comprises an auxiliary cam, an auxiliary rocker-arm shaft, an auxiliary rocker arm, an eccentric rocker arm bushing and a bushing actuation device. One end of the auxiliary rocker arm constitutes a motion pair with the auxiliary cam and the other end is above the valve. The bushing actuation device actuates the eccentric rocker arm bushing to rotate between an operating position and a non-operating position.
摘要:
An internal combustion engine having eight cylinders in V-configuration, wherein a first cylinder bank and a second cylinder bank are disposed opposite one another. The internal combustion engine includes a cross-plane crankshaft and has a firing order of a 90° crank angle from cylinder to cylinder. An intake camshaft and an exhaust camshaft are associated with each cylinder bank for actuating at least one intake gas exchange valve and one exhaust gas exchange valve for each cylinder. The gas exchange intake valves that are actuated at a 90° crank angle in the same cylinder bank have a larger valve stroke than the gas exchange intake valves in same cylinder bank actuated immediately prior thereto. The gas exchange intake valves in the same cylinder bank actuated immediately prior thereto have a smaller valve stroke than all the remaining gas exchange intake valves of both cylinder banks.
摘要:
A switchable cam follower of a valve train of a combustion engine, which has an external lever that encompasses an internal lever. The levers are pivotably moveable relative to one another at a valve-side end. The cam follower has a stop for a gas exchange valve on an underside on the valve-side end and a complementary face on the other end for a support element. The cam follower has a start face on an upper side for at least one high-lift cam. In one receptacle of the internal lever a coupling element is seated, which is displaceable longitudinally and can be brought into engagement in sections in case of coupling with a driving surface of the external lever. Also, at least one torsion is clamped between the two levers.
摘要:
In a variably operated valve apparatus of an internal combustion engine and a start control apparatus of the same engine, the internal combustion engine being equipped with a crank position control mechanism by means of which a stop position of a piston is controllable at a time of an engine stop and the variably operated valve apparatus being capable of variably controlling at least a closure timing of an intake valve, the closure timing of the intake valve is placed at a first position which is more advance angle side than the stop position of the piston of one of engine cylinders in a compression stroke and which is stop controlled by means of the crank position control mechanism and one of the remaining cylinders which is in a suction stroke has its the intake valve open, at the time of the engine stop.
摘要:
A variable valve actuator presses rocker arms using force transmitted from a drive cam to open/close valves of an engine, and includes a swing arm, which is pivotably coupled to the engine on a first side thereof, and at least two pressing means, which come into contact with the rocker arms on first sides thereof, are pivotably coupled to a second side of a swing arm on second sides thereof, and press the rocker arms when pressed by the drive cam. Thereby, the variable valve actuator can adjust a lift time and a lift distance of each valve without changing positions of the drive cams and the camshaft, and more easily adjust the lift time of each valve, and have very excellent applicability to the engine due to simple internal configuration.
摘要:
A high-efficiency mechanism for variable valve actuation with increased engine architecture applicability is described. The high efficiency mechanism introduces an intermediate lever having a secondary cam profile forming a variable oscillating cam between a rotating camshaft and a rocker arm.