Patent ID: 6283080
Filing Date: 2001-09-04
Classification: F01M,F01P,F02B,F02F

Abstract:
A vertical internal combustion engine having a cylinder block containing a crankshaft directed substantially in a vertical direction and a plurality of cylinders arranged along a vertical plane including the crankshaft, comprising:a pair of balancer shafts drivingly connected to said crankshaft, and being pivotally supported in said cylinder block and disposed in parallel with said crankshaft on opposite sides of said cylinders;pivot holes for pivotally supporting each balancer shaft being formed at uppermost and intermediate crankshaft supporting portions of said cylinder block passing through crankshaft supporting portions on said cylinder block;a work hole for working said pivot holes formed in a lowermost crankshaft supporting portion of said cylinder block positioned in axial alignment with a center line of said pivot holes; anda removable plug closing said work hole tightly;wherein a lowermost crankshaft supporting portion is divided into an upper wall and a lower wall between which an oil passage space is interposed, said lower wall extending radially slantingly downward and only the work hole is closed by said plug.