LUBRICATING DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

In a lubricating device of an internal combustion engine, a crank chamber (22) and a transmission chamber (23) to the rear of the crank chamber which accommodates therein a gear transmission (26) provided with a main shaft (27) are formed in a crankcase (10). A pump shaft (85) is shared by a scavenging pump (71) and a feed pump (70) for feeding oil to a part to be lubricated, and motive power from the crank shaft (7) is transmittable to the pump shaft (85). An axis (CP) of the pump shaft (85) is arranged below an axis (CM) of the main shaft (27). A pump gear (88) located on the pump shaft (85) meshes directly with a primary driven gear (51), which meshes with a primary drive gear (50) located on the crank shaft (7) so as to form a primary gear reduction mechanism (49), the primary driven gear (51) being arranged coaxially with the main shaft (27) and larger in diameter than the primary drive gear (50). This arrangement allows an increased degree of freedom in the arrangement of the scavenging pump and the feed pump is increased.