Petrol engine variable valve timing device

Abstract

A gasoline engine variable valve timing mechanism, which includes a camshaft, the camshaft is provided with a plurality of cams, the camshaft is also provided with a driven disc and a driving wheel in sequence, and the driven disc is provided with a cam Correspondingly, there is an arc-shaped groove on the drive wheel, and the convex column is inserted into the arc-shaped groove and can slide in the arc-shaped groove, so that the driven plate can be displaced relative to the drive wheel; two centrifugal blocks are arranged on the outside of the drive wheel , the centrifugal block is a sheet-shaped body, and its edge contour is an irregular curve. The positioning hole is set on the centrifugal block, which is correspondingly set on the fixed column of the driving wheel. The two ends of the two centrifugal blocks are respectively connected end to end by elastic elements. A sliding groove is provided on the block, and the boss on the driven plate is inserted into the sliding groove through the driving wheel and can slide in the sliding groove. The variable valve phase mechanism provided by the present invention saves complicated and expensive components such as the existing ECU, solenoid valves and multiple sensors, and the overall mechanism has simple structure, few parts, easy processing and low cost.

Description

technical field [0001] The invention relates to a gas distribution mechanism of a gasoline engine, in particular to a variable gas distribution phase mechanism of a gasoline engine, which belongs to the technical field of gasoline engine manufacturing. Background technique [0002] Such as figure 1 Shown is the gas distribution phase diagram of an ordinary gasoline engine. From figure 1 It can be seen that α is the intake advance angle, β is the exhaust late closing angle, θ is the intake late closing angle, and γ is the exhaust advance angle. [0003] The selection of valve timing depends on the performance requirements of the engine and must be compatible with the shape and size of the engine air passage. Valve timing has a great influence on the engine's air exchange quality, pumping loss, charging efficiency, external torque characteristics, idling stability, and harmful emissions. In order to ensure that the intake valve has a large opening area and the scavenging e...

AI Technical Summary

Problems solved by technology

[0005] Now the variable valve phase mechanism that is used more often is mainly realized by the electronically controlled hydraulic mechanism to realize the change of the valve phase, which is mainly controlled and executed by the information acquisition system, that is, several speed, oil pressure, temperature sensors, and the information processing system, that is, ECU. The mechanism is composed of solenoid valves and hydraulic actuators. The structure is complex and the cost is high. This type of system is only used on some high-end cars and motorcycle engines, and it is difficult to popularize most economical cars and motorcycle engines. use on

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