Continuously variable valve timing mechanism adopting conical gears

Abstract

The invention discloses a continuously variable valve timing mechanism adopting conical gears. A cam shaft gear, an intermediate gear and a transmission gear are conical gears; the transmission gear and the cam shaft gear are engaged with the intermediate gear, and are oppositely arranged; the intermediate gear is fixedly connected with an intermediate gear bearing; the intermediate gear bearing is arranged on an intermediate gear shaft in a sleeving mode; the upper end of the intermediate gear shaft is fixedly connected with a control bearing; the control bearing is arranged on a cam shaft in the sleeving mode; the transmission gear is fixedly connected with a transmission gear bearing; the transmission gear bearing is arranged on the cam shaft in the sleeving mode; the cam shaft gear is arranged on the cam shaft by a cam shaft key; a chain wheel is arranged on the transmission gear in the sleeving mode, and is connected with the transmission gear by a chain wheel key; the control device comprises a motor and a one-way drive device; and the intermediate gear shaft is connected with the motor by the one-way drive device. The continuously variable valve timing mechanism adopting conical gears is stable in phase change, simple in structure, improved in transmission precision and transmission efficiency and small in noise.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to a valve timing control mechanism of an intake and exhaust system of the internal combustion engine. Background technique [0002] Under the background of high pollution and lack of energy, energy saving and emission reduction have become a new focus of social attention; as one of the protagonists of energy consumption and air pollution, the energy saving and emission reduction of internal combustion engines is particularly important; Variable valve timing (VVT) technology is favored as a recognized technology that contributes to energy saving and emission reduction of internal combustion engines; and continuously variable valve technology is certainly one of the best choices. The mechanism can realize the adjustment of the valve timing in the range of the whole working condition of the engine, so as to achieve the most ideal valve timing control scheme. [0003] There ...

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Problems solved by technology

[0003] There are many researches on the continuously variable valve timing mechanism, but there are some problems in the existing continuously variable valve timing mechanism, such as the current popular scheme of changing the phase angle between the camshaft and the transmission gear through hydraulic pressure , due to problems such as hydraulic pulsation and compressibility, the phase change is not very stable, and it also involves problems such as sealing, so the mechanism is difficult to implement

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