| 摘要 |
PURPOSE:To reduce a friction loss of an operating valve system during a low speed operation of an engine and improve durability of the moving valve system by a method wherein a lubricant oil circulation system is divided into a cylinder block and a cylinder head system, respectively, and the latter is circulated with lubricant oil having a higher viscosity than that of the latter. CONSTITUTION:In a lubricating device, a circulation system for lubricant oil is divided into a cylinder block 7 and a cylinder head 9. In the cylinder block 7, pressurized lubricant oil supplied by an oil pump 2 is fed to a sliding part or bearing part of a crank shaft 1 through an oil filter 5 and a main oil passage 6 and at the same time a piston 12 or cylinder bore 11 etc. are lubricated by lubricant oil injected from a splashing bore 10a. In turn, the cylinder head 9 supplys pressurized lubricant oil fed by the oil pump 2A to the sliding part or bearing part of the cam shaft 14. The lubricant oil applied in the cylinder head 9 has a higher viscosity than that applied in the cylinder block 7. |
