Four-stroke engine

Abstract

The invention discloses a four-stroke engine which comprises an oil tank, a crankshaft chamber, a distribution chamber, a rocker chamber, a combustion chamber and a lubricating system. The four-stroke engine is characterized in that the oil tank is communicated with the crankshaft chamber through an oil supply channel, the crankshaft chamber is communicated with distribution chamber through a first oil channel, a one-way valve is disposed in the first oil channel, the rocker chamber is communicated with the crankshaft chamber through at least one oil return channel, a one-way valve is disposed in each oil return channel, the distribution chamber is communicated with the oil tank and used for separating oil-gas mixture into oil mist and fluid oil. The four-stroke engine further comprises a cam and a transmission mechanism connected between the cam and a crankshaft of the crankshaft chamber in a matched manner. The cam is matched with a rocker of the rocker chamber and located above the combustion chamber. The four-stroke engine is simple in lubricating system arrangement, good in operation stability, low in noise, and simple in structure.

Description

[0001] This patent application may refer to two invention patent applications previously submitted by the applicant of this patent, the application numbers of which are: 201210198826.4 and 2013102076373 respectively. technical field [0002] The invention relates to a four-stroke engine. Background technique [0003] Four-stroke engines are now widely used in various small tools, such as hand-held lawn mowers, shearers or other backpack working machines. Therefore, in addition to stricter requirements on the running stability, low vibration and lubrication system of the engine, the demand for simplified components and light weight of the overall structure is becoming increasingly strong. [0004] The existing four-stroke engines generally have two problems: on the one hand, the oil pipeline of the lubrication system is relatively complicated, which makes the processing complicated and the cost increases; on the other hand, the structure of the parts is relatively complicated...

AI Technical Summary

Problems solved by technology

[0004] The existing four-stroke engines generally have two problems: on the one hand, the oil pipeline of the lubrication system is relatively complicated, which makes the processing complicated and the cost increases; on the other hand, the structure of the parts is relatively complicated and the quality is not light enough, such as , the cam chamber and the rocker arm chamber of the existing four-stroke engine are set separately and the distance is relatively far, so the cam in the cam chamber needs to transmit power to the rocker arm of the rocker chamber through a relatively long metal tappet, so high-speed The running tappet will produce relatively large jitter and negatively affect the running stability and noise performance of the engine. Moreover, the separate cam chamber and rocker chamber will also make the engine more parts and increase its own weight. , higher manufacturing cost

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