Variable-mode valve driving system

Abstract

The invention discloses a variable-mode valve drying system and belongs to the field of engine vale driving, cylinder stopping and auxiliary braking. The variable-mode valve driving system comprises an exhaust braking cam, an exhaust drive cam, a gas inlet drive cam and a gas inlet braking cam, wherein all the cams drive a valve through push rods, rocker arms and the like. The variable-mode valve driving system further comprises an exhaust braking fulcrum assembly, an exhaust drive fulcrum assembly, a gas inlet drive fulcrum assembly and a gas inlet braking fulcrum assembly which are arranged between all the cams and correspond valve assemblies or all the cams and corresponding valve bridge assemblies. Modes of four-stroke driving, two-stroke braking, cylinder stopping and the like are achieved by controlling the states of all the fulcrums, and the purposes of low oil consumption, low emission and efficient braking are achieved. The variable-mode valve driving system is compact in structure, high in reliability and low in cost.

Description

Technical field [0001] The invention relates to a variable mode valve drive system, which belongs to the fields of engine valve drive, cylinder deactivation and auxiliary braking. Background technique [0002] With the rapid increase in the number of engines, energy and environmental issues have become one of the major issues restricting the sustainable development of our country. Because of its ability to effectively reduce engine fuel consumption and emissions, cylinder deactivation technology has attracted much attention. Studies have shown that: completely closing the intake and exhaust valves when the cylinder is stopped can effectively reduce the pumping loss and improve the ability of the cylinder stop technology to reduce fuel consumption and emissions. [0003] People pay more and more attention to vehicle safety, and more and more countries list auxiliary braking systems as one of the necessary accessories for vehicles. However, most of the current auxiliary braking sys...

AI Technical Summary

Problems solved by technology

In addition, this mechanism also has problems such as a large number of moving parts and a large mass caused by both the drive and brake adjustment mechanisms being installed on the rocker arm, which is not conducive to the low energy consumption of the valve drive system; in addition, the motion inertia of the rocker arm is large. The contact parts of the system components are prone to damage

The drive oil of this mechanism is led from the inside of the shaft as the fixed fulcrum of the rocker arm to the movable fulcrum of the rocker arm to adjust the drive and brake adjustment mechanism. The oil circuit is relatively complicated and difficult to process.

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