Lubricating oil supply device for internal combustion engine

Abstract

A lubricating oil supply device for an internal combustion engine in which a lubricating oil pump is provided to one end of a balancer shaft, but an oil conduit is not required to be provided to the balancer shaft. The lubricating oil pump is connected to one end of the balancer shaft. An intake oil conduit for directing lubricating oil to the lubricating oil pump is disposed inside a wall thickness of a crankcase. A discharge oil conduit for directing lubricating oil pressurized in the lubricating oil pump to the in-shaft oil conduit is disposed within the wall thickness of the crankcase.

1 . A lubricating oil supply device for an internal combustion engine, comprising: a crankcase; a crankshaft and a balancer shaft, both housed in the crankcase; an in-shaft oil conduit, provided in the crankshaft, for directing supplied lubricating oil to a crankshaft bearing,
 wherein the lubricating oil supply device further comprises:   a lubricating oil pump, connected to one end of the balancer shaft, for drawing in and pressurizing the lubricating oil pooled in the crankcase,   an intake oil conduit, disposed within a wall thickness of the crankcase, for directing the lubricating oil pooled in the crankcase to the lubricating oil pump; and   a discharge oil conduit, disposed within the wall thickness of the crankcase, for directing the lubricating oil pressurized by the lubricating oil pump to the in-shaft oil conduit.   
     
     
         2 . The lubricating oil supply device of  claim 1 , wherein the lubricating oil pump is disposed within the wall thickness of the crankcase. 
     
     
         3 . The lubricating oil supply device of  claim 1 , wherein the lubricating oil pump comprises an inner rotor having a plurality of teeth, and an outer rotor having a greater number of teeth than the number of teeth of the inner rotor, and a seal plate is disposed between a bearing for rotatably supporting one end of the balancer shaft and the inner and outer rotors.