Timing belt automatic tension control system using oil hydraulic pressure of engine

摘要

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic tension adjusting device that always uses a hydraulic pressure generated in an oil pump to keep the tension of a timing belt constant.;According to an aspect of the present invention, there is provided a timing belt transmission apparatus for transmitting a driving force of a crankshaft to a camshaft, comprising: a tensioner bearing for pressing and urging against a surface of a timing be a rod for rotatably supporting the tensioner bearing; A cylinder for accommodating the plunger movably; an oil pump for supplying a hydraulic pressure to the cylinder; and a hydraulic pressure regulating valve which is opened to discharge the hydraulic pressure acting on the cylinder when the hydraulic pressure is higher than a reference value, And a bypass line for returning oil to the oil tank side when the hydraulic pressure adjusting valve is opened.