Lubrication system of handheld air-cooled four-stroke gasoline engine and gasoline engine

Abstract

The invention relates to a lubrication system of a handheld air-cooled four-stroke gasoline engine and a gasoline engine. The lubrication system comprises a cylinder block, a crankshaft connecting rodgroup, a piston, a crankcase formed by a front box body and a rear box body and a cylinder cover; the lubrication system furhter comprises a crankshaft chamber and an oil storage chamber which communicate with each other, an oil feeding channel and an oil returning channel which form a circulation and are provided with a one-way valve; through the change of pressure in a rotary crank chamber of the crankshaft, lubricating oil mist lubricates all parts in a valve chamber, a tappet chamber, a cam chamber and the crank chamber. a first-stage oil-gas separation channel and a second-stage exhaustchannel are arranged to discharge the burnt waste gas which enters the crank chamber from the gap between the piston and the cylinder body out of the crankcase; The scheme provided by the invention has the beneficial effects of smooth circulation of lubricating oil, reliable separation of the oil-gas separation device, effective control of waste gas timing, unidirectional discharge, stable operation of products at any angle, etc.

Description

technical field [0001] The invention relates to the technical field of gasoline engines, in particular to a hand-held air-cooled four-stroke gasoline engine lubrication system and a gasoline engine. Background technique [0002] With the enhancement of people's awareness of environmental protection and the continuous strengthening of exhaust emission control at home and abroad, it is an inevitable trend to replace two-stroke gasoline engines with hand-held air-cooled four-stroke gasoline engines that are more in line with environmental protection requirements. Most of the hand-held tools need to be able to work smoothly at any angle, but the hand-held air-cooled four-stroke gasoline engines currently on the market mostly recover the lubricating oil through gravity to make the oil flow back into the lubricating oil chamber, which causes the gasoline engine to be turned upside down Or when the inclination angle is too large, the engine oil cannot be recovered, which will affec...

AI Technical Summary

Problems solved by technology

Although it can lubricate the components in the gasoline engine, it uses a reed-type check valve to achieve one purpose, which increases the difficulty of manufacturing the whole machine and increases the manufacturing cost of the whole machine

In addition, it uses the top part of the cylinder cover to separate the oil and gas. When the gasoline engine is inverted for a long time, the oil will fill the cylinder cover, and the oil and gas separation mechanism will lose its function, which will affect the performance of the gasoline engine.

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