Rocker arm mechanism capable of early air valve closing and engine

Abstract

The application discloses a rocker arm mechanism capable of early air valve closing. The rocker arm mechanism capable of early air valve closing comprises a rocker arm, a rocker arm shaft, a piston and a solenoid valve. An oil charging groove and an oil discharging groove are formed in the periphery of the rocker arm shaft. A rocker arm shaft lubricating oil passage and a rocker arm shaft oil discharging passage are arranged in the rocker arm shaft. The oil charging groove communicates with an engine main oil passage by the rocker arm shaft lubricating oil passage and the oil discharging groove communicates with the solenoid valve by the rocker arm shaft oil discharging passage. Piston cavity used for containing the piston is arranged at a pushing rod supporting end and / or an air valve bridge supporting end of the rocker arm. The rocker arm is provided with an oil charging passage and oil discharging passages. A rocker arm shaft hole communicates with the piston cavity by the oil charging passage. A check valve, which is used for unilateral connecting from the rocker arm shaft hole to the piston, is arranged in the oil charging passage. Oil is charged into a piston cavity when a cam rotates to the base circle position and the solenoid valve is capable of controlling oil discharging of the piston cavity when the cam rotates to the lift position. According to the mechanism, oil charging and discharging of the piston cavity can be realized, so that lowering on the basis of original lift and early closing of an air valve can be realized, the related applications such as Millercycle of early air valve closing can be realized and the engine property can be improved. The application further discloses an engine.

Description

technical field [0001] The invention relates to the technical field of engine components, in particular to an early valve closing rocker mechanism and an engine. Background technique [0002] Traditional engines mostly use a mechanical valve mechanism in which the camshaft drives the intake valve and the exhaust valve to open. The movement of the valve is controlled by the mechanical transmission between the crankshaft and the camshaft, and between the camshaft and each valve. The cam valve phase of the mechanical valve train is tested through various valve phases, and a certain fixed valve phase is selected to take into account various working conditions, which is a compromise solution for engine performance, so it is impossible In both cases, the best performance is achieved. [0003] The existing engine rocker arm is a rigid rocker arm, and one end bears the lift transmitted by the cam-tappet-push rod, and transmits it to the valve side to control the valve movement. Th...

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Problems solved by technology

[0003] The existing engine rocker arm is a rigid rocker arm, and one end bears the lift transmitted by the cam-tappet-push rod, and transmits it to the valve side to control the valve movement. The shock is buffered, and the variable valve lift cannot be realized

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