Full-variable electro-hydraulic air valve system with buffering function

Abstract

The invention discloses a full-variable electro-hydraulic air valve system with a buffering function. The full-variable electro-hydraulic air valve system comprises a sliding sleeve, a spiral shaft, apiston and a reset spring. The sliding sleeve is fixed relative to an engine. The piston is arranged on an air valve assembly in an abutting manner. The spiral shaft is controlled by a cam face of acam shaft in the axial direction. A spiral face is arranged at the first end of the spiral shaft, and a control gear is arranged at the second end of the spiral shaft. A buffering oil hole communicating with the buffering cavity is formed in the sliding sleeve. The buffering oil hole communicates with a low-pressure oil way of the engine through a throttling device. When an air valve is going to be located, the piston firstly collides with a buffering ring, due to the effect of the throttling device, the engine oil in the buffering cavity has a damping effect on the movement of the buffering ring, the air valve is located slowly, impact damage on the sealing face of the air valve and the air valve seat is reduced, and the service life of an air valve mechanism is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of engine valve mechanism, in particular to a fully variable electro-hydraulic valve system with buffer function. Background technique [0002] Fully Variable Valve System (FVVS for short) can realize the continuous variable of the maximum valve lift, valve opening duration angle and valve timing, which is of great significance to the energy saving and emission reduction of the engine. FVVS can control the amount of working fluid entering the cylinder by means of early intake valve closing (EIVC), thereby canceling the throttle valve. This throttleless gasoline engine will greatly reduce the pumping loss and reduce the fuel consumption under small and medium loads. 10-15%. The fully variable valve mechanism is matched with supercharging and intercooling, which can solve the problems of engine deflagration and high heat load after supercharging, realize low-temperature combustion under the premise of greatly...

AI Technical Summary

Problems solved by technology

[0005] However, in the application of this device, it was found that during the process of electro-hydraulic control valve seating, the mechanism has the problem of excessive seating speed, which causes impact damage to the sealing surface of the valve and valve seat, and affects the service life

Moreover, during the engine shutdown process, the hydraulic oil in the sliding sleeve cavity will slowly leak, and when the engine is started, there may be a phenomenon of "no oil" in the sliding sleeve cavity, which will cause the system to fail

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