Lubrication mechanism

Abstract

The lubrication mechanism comprises a vertically disposed crank shaft, a laterally movable piston, a connecting rod connecting the crank shaft and the piston, a cylinder barrel housing the crank shaft and the piston, a crank case containing the crank shaft together with the cylinder barrel, a cylinder head forming a combustion chamber, the combustion chamber connecting to a piston movable part end face of the cylinder barrel, an oil filter, and an oil filter installation member in which the oil filter is vertically installed, and the oil filter installation member includes a lubricant detour structure.

What is claimed is: 
     
         1 . A lubrication mechanism comprising:
 a vertically disposed crank shaft,   a laterally movable piston,   a connecting rod connecting the crank shaft and the piston,   a cylinder barrel housing the crank shaft and the piston,   a crank case containing the crank shaft together with the cylinder barrel,   a cylinder head forming a combustion chamber, the combustion chamber connecting to a piston movable part end face of the cylinder barrel,   an oil filter, and   an oil filter installation member in which the oil filter is vertically installed, wherein the oil filter installation member includes a lubricant detour structure.   
     
     
         2 . The lubrication mechanism according to  claim 1 , wherein the lubricant detour structure comprises a lubricant detour route formed in the oil filter installation member, and an oil relief valve installed in the lubricant detour route. 
     
     
         3 . The lubrication mechanism according to  claim 2 , wherein the lubricant detour route follows a route other than a filtered lubricant route of the oil filter to return lubricant to an engine. 
     
     
         4 . The lubrication mechanism according to  claim 2 , wherein the oil relief valve allows residual lubricant to reflow to the engine, when the oil filter is removed. 
     
     
         5 . The lubrication mechanism according to  claim 2 , wherein the oil relief valve comprises a cylindrical valve guide, a spring, and a piston part, the valve guide has an outer circumference formed with a spiral guide hole, the piston part includes a guide pin that fits into the guide hole,
 with movement of the piston part in an up-down direction, the guide pin moves through the guide hole, the valve guide rotates within a range of 90°, the valve guide has a lower end in which a communication hole opens, and the communication hole is disposed in a relief oil path.   
     
     
         6 . The lubrication mechanism according to  claim 1 , wherein the oil filter installation member has a flange shape with respect to the oil filter. 
     
     
         7 . The lubrication mechanism according to  claim 6 , wherein the flange shape is a shape surrounding the oil filter. 
     
     
         8 . An outboard motor comprising the lubrication mechanism according to  claim 1 . 
     
     
         9 . A ship comprising the outboard motor according to  claim 8 .