Two-valve stroke synchronously-variable device

Abstract

The invention relates to a two-valve stroke synchronously-variable device which belongs to the technical field of mechanical design. The two-valve stroke synchronously-variable device comprises an inlet channel, an exhaust channel, an inlet valve lower segment, an exhaust valve, an inlet valve upper segment, a volume cavity, a movable body, a through tube, a movable block and a movable rod, wherein the movable body is arranged in the volume cavity and is hermetically contact with the inner wall surface of the volume cavity; the through tube penetrates through the upper wall surface and the lower wall surface of the movable body; the movable block is arranged in the through tube and is hermetically contact with the inner wall surface of the through tube; the lower end surface of the movable block forms a plane, and the upper end surface of the movable block forms a slope; the inlet valve upper segment penetrates through the upper wall surface of the volume cavity and extends into the through tube, and the lower end surface of the inlet valve upper segment is hermetically contact with the upper end surface of the movable block. When the movable body moves towards right, the strokes of inlet and exhaust valves are lengthened, when the movable body moves towards left, the strokes of the inlet and exhaust valves are shortened, and the continuous variation of the strokes of the inlet and exhaust valves can be realized. The two-valve stroke synchronously-variable device disclosed by the invention is reasonable in design, simple in structure and suitable for the inlet and exhaust valve stroke variable system of an engine.

Description

technical field [0001] The invention relates to an engine intake and exhaust system in the technical field of mechanical design, in particular to a synchronous variable device for lifts of two valves. Background technique [0002] The valve lift of the traditional gasoline engine is fixed and invariable, that is, there is only one cam profile of the camshaft, which makes it impossible for the lift to make the engine respond well in both high-speed and low-speed areas. The valve lift or cam profile design of a traditional gasoline engine is a balanced choice for the engine under all operating conditions. As a result, the engine can neither get the best high-speed efficiency nor the best low-speed torque, but it can get The most balanced performance under all working conditions. The adoption of variable valve lift enables the engine to obtain the required valve lift in both high-speed and low-speed areas, thereby improving the high-speed power and low-speed torque of the engi...

AI Technical Summary

Problems solved by technology

However, its design is to use a hydraulic mechanism, which requires high sealing performance. If the sealing is not tight, it will easily cause liquid leakage; and because the liquid has a certain compressibility, the response speed of the valve lift change has a certain delay.

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