Cylinder cover of natural gas engine

Abstract

The invention discloses a cylinder cover of a natural gas engine. The cylinder cover is of a frame type cavity structure and comprises an air inlet passage, an air exhaust passage, valve seat ring holes, a saucer-shaped combustion chamber and a spark plug mounting hole. The frame type cavity structure comprises a bottom plate, side plates and a top plate, the air inlet passage and the air exhaust passage are arranged in the middle of a cavity and are respectively communicated with the combustion chamber via valves; the valve seat ring holes are respectively formed in positions among the air inlet passage, the air exhaust passage and the combustion chamber and are used for mounting valve seat rings and forming sealing strips for the heads of the valves; the saucer-shaped combustion chamber is in the shape of an inverted saucer, the size of the outer edge of the saucer-shaped combustion chamber is matched with that of the outer edge of a piston-cup-shaped combustion chamber, and the saucer-shaped combustion chamber and the piston-cup-shaped combustion chamber form an apple-shaped combustion chamber; the spark plug mounting hole is formed in a position between the air inlet passage and the air exhaust passage and is communicated with the saucer-shaped combustion chamber. The cylinder cover has the advantages that owing to the structural design of the saucer-shaped combustion chamber at the bottom of the cylinder cover, the radiating performance of the cylinder cover can be improved, and the reliability of a piston can be effectively enhanced.

Description

technical field [0001] The invention relates to the field of engines, in particular to a cylinder head of a natural gas engine. Background technique [0002] The cylinder head of a traditional natural gas engine usually adopts an open combustion chamber. Due to the small compression ratio of a gas engine, the volume of the combustion chamber is larger than that of a diesel engine. Arranged on the side of the cylinder head, the common practice is to adopt a V-shaped valve arrangement, and set an inverted bowl-shaped combustion chamber at the bottom of the cylinder head. The structure of the cylinder head and valve chain of this structure is complex, and the cylinder head is manufacturable and reliable. sex is relatively poor. However, if a similar diesel engine adopts a vertical valve arrangement, it is necessary to dig deep into the piston and increase the combustion chamber to reduce the compression ratio, which has a great impact on the reliability of the piston, and the ...

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Problems solved by technology

[0002] The cylinder head of a traditional natural gas engine usually adopts an open combustion chamber. Due to the small compression ratio of a gas engine, the volume of the combustion chamber is larger than that of a diesel engine. Arranged on the side of the cylinder head, the common practice is to adopt a V-shaped valve arrangement, and set an inverted bowl-shaped combustion chamber at the bottom of the cylinder head. The structure of the cylinder

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