CAM SHAFT DRIVE IN OHC V-TYPE ENGINE

摘要

In a cam shaft drive structure in which a toothed belt (14) passes around a pair of cam shaft pulleys (10, 20) of two cylinder banks (2a, 2b) of an OHC V-type engine (1) and a crank shaft pulley (11), it has been widely believed that the tension in the toothed belt resulting from the longitudinal vibration thereof would be minimized by reducing the masses of the cam shaft pulleys as much as possible. However, we have discovered that this is not necessarily the case and on the contrary a favorable result can be obtained by making the moment of inertia of the cam shaft pulley (10) on the tight side greater than that of the cam shaft pulley (20) on the slack side. The reverse face of the toothed belt may conveniently be utilized to drive accessory equipment (12) and for engaging a tensioning pulley (13).