Variable valve timing device

Abstract

The invention discloses a variable valve timing device. A driven gear is fixed at one end of a camshaft; an upper chain wheel is arranged on one side of the camshaft; the upper chain wheel and a driving gear are fixed to a connecting shaft; the connecting shaft is located on a fixing bracket depending on a bearing, and rotates around the axis of the camshaft; a through hole is drilled in the axisof the connecting shaft; an arm consists of a big end, a small end and screws; the big end of the arm consists of a cylinder and a long block extending in the radial direction of the cylinder; two gears different in reference diameters are fixed to a middle shaft; a section of narrow neck is formed in the middle shaft; two semicircular concave surfaces of the big end and the small end of the arm are clamped in the narrow neck; the big end can be connected with the small end through the screws; and two middle shaft gears are correctly engaged with the driving gear and the driven gear correspondingly. A cylinder of a driving arm controlled by servo motors rotates around the axis of the camshaft, and the position of the middle shaft is changed, so that the phase relation between an input gearand an output gear is changed, and valve timing is changed. By additionally adopting a servo motor, an arm, a middle shaft, middle shaft gears, a driven gear and a transmission gear, the phase of a second shaft rotating around the axis of the camshaft can be controlled.

Description

technical field [0001] The invention relates to the field of internal combustion engine valve timing control. Background technique [0002] In order to increase the torque at each speed of the internal combustion engine, the variable valve technology has appeared and developed for more than ten years. Most of the valve timing control devices on the market today use electro-hydraulic control technology, which has the problems of difficult parts processing and oil leakage. Contents of the invention [0003] The servo motor controls the position of the intermediate shaft, changes the phase relationship of the input and output gears, thereby adjusting the phase of the camshaft, and optimizes the transmission ratio between the sprockets to reduce chain vibration. The device is mainly a gear mechanism with simple control and no problem of oil leakage. Description of drawings [0004] figure 1 Assembly drawing [0005] figure 2 exploded diagram. detailed description ...

AI Technical Summary

Problems solved by technology

Most of the valve timing control devices on the market today use electro-hydraulic control technology, which has the problems of difficult parts processing and oil leakage.

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