PURPOSE: To improve durability of a winding member and reduce noises by reducing tensile strength fluctuation of a tensioned part of the winding member wound between a timing pulley and a cam pulley for suppressing fluctuation of angle speed of a cam shaft, and preventing generation of secondary mode vibrations of the winding member.
CONSTITUTION: A rotary member D such as an eccentric pulley provided with teeth to be engaged with teeth of a winding member C is engaged with the winding member C from inside its circle, at a position distanced from a cam pulley B or a timing pulley A by a one-fourth length of the length La of a tensioned part Ca in the winding member C provided with teeth, which member C is wound between the timing pulley A and the cam pulley B in a form of circle. The tensioned part Ca of the winding member C is periodically brought under push-press in synchronization with the rotation of a crank shaft and in accordance with a loosened timing of the tensioned part Ca.
SUDO YASUHIRO
DOI NOBUO
