Patent ID: 9598988
Date: 2017-03-21
CPC Classifications: F01M,F02B,F16N

Claim:
1. A four-stroke engine lubricating system, wherein the four-stroke engine comprises: an oil pan for storing lubricating oil; a crankcase; a cam box; a rocker chamber; and a distribution chamber communicated with the oil pan and used for separating oil & gas mixture into oil mist and liquid oil; a cylinder, and a cylinder block, the four-stroke engine lubricating system is characterized in that the lubricating system is as follows: the oil pan and the crankcase are communicated through an oil supply passage, and a first one-way valve is disposed in the oil supply passage; the oil supply passage includes an annular passage which is respectively spliced by recesses disposed on the cylinder and the cylinder block; the crankcase and the distribution chamber are communicated through a first oil conveying passage, and a second one-way valve is disposed in the first oil conveying passage; the distribution chamber and the cam box are communicated through a second oil conveying passage; the cam box and a rocker chamber are communicated through a third oil conveying passage; the rocker chamber and the crankcase are communicated through at least one oil return passage, and a third one-way valve is disposed in the oil return passage.