| 摘要 |
PURPOSE:To enable ensurance of drive of various auxiliary devices and compacting of an engine, by a method wherein the rotation force of a crank shaft is transmitted to a tappet valve mechanism and other auxiliary devices through a single flexible endless member. CONSTITUTION:In the same vertical surface as that of a drive pulley 8 formed to the front end of a crank shaft 7, a pulley 16 for driving a pump and a pulley 13 for driving a balancer are situated on the same side based on a line for interconnecting the pulley 8 and a pulley 11 for driving a cam, a tensioner 14 is situated on the opposite side, and the pulley 16 is situated further outside than the pulley 13. An endless double-toothed belt 18 is spanned such that the single endless belt makes contact with the pulleys in a way that the inner sur face of the belt 18 is brought into contact with the pulleys 8, 11, and 16 and the outer surface of the belt 18 is forced into contact with the pulleys 13 and 14. This constitution of the auxiliary devices adequately increases a winding angle of the endless double-toothed belt 18 with the pulleys 11, 16, 13, and 8, reliably transmits the power of the crank shaft 7 to each auxiliary device, simplifies a transmission mechanism, and compacts an engine. |
