US 10,267,223 B2Granted

Portable four-stroke engine

AssigneeChongqing Rato Technology Co., Ltd.

InventorsKe Chen, Heguangnan Zhi, Jianguo Bai, Tao Jiang

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Abstract

The present utility model discloses a portable four-stroke engine, comprising: an engine body, a flywheel and an oil storage tank, wherein an air valve distribution chamber and a crank shaft chamber are arranged in the engine; a crank shaft is arranged in the crank shaft chamber, and is connected to the flywheel; the oil storage tank is arranged on the engine body, located above the flywheel, and configured to store lubricating oil; a cam and a rocker arm mechanism are arranged in the air valve distribution chamber; and the cam is configured to drive the rocker arm mechanism. The portable four-stroke engine provided by the present utility model has a small volume and therefore has better operation performance.

Claims9

Dependent claims

A portable four-stroke engine, comprising:

an engine body, a flywheel, an oil storage tank, and a cylinder head cover, wherein an air valve distribution chamber, a crank shaft chamber, and a valve chamber are arranged in the engine, a check valve, a value hole, and a circulation flow passage are arranged in the valve chamber, the value chamber is communicated with the crank shaft chamber via the valve hole, the circulation flow passage of the valve chamber is communicated with the air valve distribution chamber;
a crank shaft is arranged in the crank shaft chamber, and is connected to the flywheel;
the oil storage tank is arranged on the engine body, located on a side of the flywheel which is closer to the cylinder head than to the side opposite that, and configured to store lubricating oil;
a cam and a rocker arm mechanism are arranged in the air valve distribution chamber;
and the cam is configured to drive the rocker arm mechanism;
an oil mist generation device is arranged in the oil storage tank, the oil mist generation device comprises a rotating shaft, several oil stirring plates, and a reducing sleeve, the reducing sleeve is arranged on the rotating shaft in a sleeving manner, the rotating shaft is rotatable relative to the reducing sleeve, the oil stirring plates are fixed to the rotating shaft, the rotating shaft and each oil stirring plate are provided with oil outlet passages, each oil outlet passage on the oil stirring plate is communicated with the that on the rotating shaft, and the oil outlet passage on the rotating shaft is connected to the oil outlet pipe via the reducing sleeve, the oil outlet pipe is connected to the crank shaft chamber;
the cylinder head cover is arranged at the upper end of the engine body, the cylinder head cover is communicated with atmosphere and the air valve distribution chamber, such that the air valve distribution chamber is communicated with the atmosphere.

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Dependencies are inferred from the claim text.

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Abstract

A portable four-stroke engine, comprising:

an engine body, a flywheel, an oil storage tank, and a cylinder head cover, wherein an air valve distribution chamber, a crank shaft chamber, and a valve chamber are arranged in the engine, a check valve, a value hole, and a circulation flow passage are arranged in the valve chamber, the value chamber is communicated with the crank shaft chamber via the valve hole, the circulation flow passage of the valve chamber is communicated with the air valve distribution chamber;
a crank shaft is arranged in the crank shaft chamber, and is connected to the flywheel;
the oil storage tank is arranged on the engine body, located on a side of the flywheel which is closer to the cylinder head than to the side opposite that, and configured to store lubricating oil;
a cam and a rocker arm mechanism are arranged in the air valve distribution chamber;
and the cam is configured to drive the rocker arm mechanism;
an oil mist generation device is arranged in the oil storage tank, the oil mist generation device comprises a rotating shaft, several oil stirring plates, and a reducing sleeve, the reducing sleeve is arranged on the rotating shaft in a sleeving manner, the rotating shaft is rotatable relative to the reducing sleeve, the oil stirring plates are fixed to the rotating shaft, the rotating shaft and each oil stirring plate are provided with oil outlet passages, each oil outlet passage on the oil stirring plate is communicated with the that on the rotating shaft, and the oil outlet passage on the rotating shaft is connected to the oil outlet pipe via the reducing sleeve, the oil outlet pipe is connected to the crank shaft chamber;
the cylinder head cover is arranged at the upper end of the engine body, the cylinder head cover is communicated with atmosphere and the air valve distribution chamber, such that the air valve distribution chamber is communicated with the atmosphere.

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