Patent ID: 7584736
Filing Date: 2009-09-08
Classification: F01M

Abstract:
1. A lubrication device of a four-stroke engine having a cylinder, a crank case, a rocker arm room connected to a cam room and a breathing pipe, the crank case comprising a crankshaft first section and a crankshaft second section connected to each other via a connection portion and move simultaneously, the cylinder having a piston connecting rod connected to the connection part, the lubrication device comprising: a lubricant tank connected to a bottom of the crank case, for containing lubricant; a stirring chamber disposed beneath the crank case and partially disposed inside the lubricant tank, and the stirring chamber having a long, narrow concave disposed in the lubrication tank and being disposed with at least one oil hole connected to the lubricant tank, each of the oil holes is at least disposed on two sides and a bottom end of the long, narrow concave; an oil stirring rod disposed at one end of the piston connecting rod and received in the stirring chamber, for stirring the lubricant to form oil mists; an oil supply path comprising a pipeline connected to the rocker arm room and the crank case, and an oil supply channel disposed inside the crankshaft first section and correspondingly connected to the pipeline and an interior of the crank case, and the oil supply channel being open when the crankshaft first section rotates to a first rotation angle in the crankshaft first section, so as to supply the oil mists through the rocker arm room to the cam room; an oil recycling path comprising an oil recycling channel disposed inside the crankshaft second section and correspondingly connected to interiors of the cam room and the crank case, and the oil recycling channel being open when the crankshaft second section rotates to a second rotation angle different from the first rotation angle in the crankshaft second section, so as to re-absorb the oil mists into the crank case; and an exhaust channel comprising a third axial aperture disposed on the camshaft and connected to the breathing pipe, and a third radial aperture connected to the third axial aperture and the cam room.