Water jacket structure of cylinder heads of parallel double-cylinder two-stroke engine

Abstract

The invention discloses a water jacket structure of cylinder heads of a parallel double-cylinder two-stroke engine. The water jacket structure comprises a water jacket body which is arranged on a left cylinder head and a right cylinder head of parallel double cylinders, wherein the water jacket body corresponds to the left cylinder head and the right cylinder head; water inlets are formed in the water jacket body; the water jacket body comprises a left cylinder head cooling water channel and a right cylinder head cooling water channel which are mutually independent inside; the left cylinder head cooling water channel and the right cylinder head cooling water channel are respectively relative to the cylinder heads of a left cylinder and a right cylinder; the left cylinder head cooling water channel and the right cylinder head cooling water channel have a same main water outlet; the number of the water inlets in the corresponding water jacket body on the same exhaust side of the left cylinder head and the right cylinder head is larger than the number of the water inlets in the corresponding water jacket body on the same air inlet side of the left cylinder head and the right cylinder head; and combustion chambers of the left cylinder and the right cylinder and circulation water channels which perform vortex cooling along mounting positions of spark plugs are arranged on the left cylinder head cooling water channel and the right cylinder head cooling water channel. According to the water jacket structure, the structure design is reasonable, turbulence of all regions of the water jacket is strengthened, and the cooling efficiency is improved.

Description

technical field [0001] The invention relates to a cylinder head water jacket structure of a parallel twin-cylinder two-stroke engine, which belongs to the technical field of engine cooling. Background technique [0002] As an important part of the sealed combustion chamber, the cylinder head of a parallel twin-cylinder two-stroke engine is subjected to the action of hot gas and bears the mechanical load formed by the pressure of the cylinder block. It is required that the temperature of each part of the cylinder head be evenly distributed as much as possible, and the working temperature should not exceed the temperature of the cylinder head material. Critical temperature, and requires sufficient strength in the entire working temperature range, when the cooling of the cylinder head is insufficient, it will cause local overheating, and the cylinder head is prone to cracks and engine damage under the action of thermal fatigue. Therefore, it is required that the cooling water c...

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Problems solved by technology

[0003] In the water jacket of the cylinder head of a traditional parallel twin-cylinder two-stroke engine, a special cooling water channel is arranged around the combustion chamber of each cylinder, but the water outlet is arranged on the engine side, and the same cooling water channel is set on the intake side and the exhaust side. , which leads to roughly the same cooling water flow rate on the intake side and exhaust side, because the temperature on the exhaust side is higher than that on the intake side, the cooling effect on the exhaust side is poor, and the shared water outlet causes the temperature of the two cylinder heads to be uneven, and the cylinder heads are prone to thermal fatigue failure

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