Fully variable electro-hydraulic valve system

Abstract

The invention discloses a fully variable electro-hydraulic valve system. The fully variable electro-hydraulic valve system comprises a sliding sleeve, a spiral shaft, a piston and a return spring; thesliding sleeve is fixed relative to an engine; the piston butts against a valve assembly; the spiral shaft is axially controlled by a cam surface of a camshaft; the spiral shaft is provided with a spiral groove and a blockage part; when the spiral groove communicates with a limiting oil hole, a sliding sleeve cavity communicates with a low-pressure oil way of the engine for pressure relief; a spiral shaft axial projection portion is arranged at a first end of the spiral shaft; a spiral shaft ejecting plane is arranged on the spiral shaft axial projection portion; a piston axial projection portion is arranged at the end, opposite to the spiral shaft, of the piston; and a piston ejecting plane is arranged at the head portion of the piston axial projection portion. The fully variable electro-hydraulic valve system solves the problem of influence on normal work of the system due to loss of machine oil in the sliding sleeve cavity, keeps the crankshaft rotating angle corresponding to the valve opening time invariable, and is particularly suitable for application to control of the variable travel of an intake valve of an engine in the scavenging process.

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. 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 increasing the avera...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a fully variable electro-hydraulic valve system to solve the problem that the normal operation of the system is affected due to the loss of oil in the sliding sleeve cavity, and to maintain the crankshaft rotation angle corresponding to the opening moment of the valve. constant

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