Piston cooling device of motorcycle engine

Abstract

The invention relates to a piston cooling device of a motorcycle engine. The piston cooling device comprises a cylinder body, a piston, a crankshaft connecting rod assembly and a crankcase, wherein the piston is arranged in the cylinder body, the piston is connected with the crankshaft connecting rod assembly, the crankshaft connecting rod assembly is arranged in an inner cavity of the crankcase, an annular oil pipe is arranged in the crankcase and is positioned above the piston, and a plurality of oil injection nozzles are arranged on the annular oil pipe; the annular oil pipe is connected with an oil injection control valve, the oil injection control valve comprises a valve body with a cavity, an oil inlet passage is formed in one end of the cavity, an oil outlet is formed in the other end of the cavity and is communicated with the annular oil pipe, an annular plug is arranged at the oil inlet passage, and a spring is arranged between the annular plug and the oil outlet. According to the piston cooling device, the purpose of controlling to inject cooling oil can be achieved according to engine speed, so that the piston cooling effect can be greatly increased, and additionally, the lubricating effect between the piston and the inner wall of the cylinder body can be increased.

Description

Technical field [0001] The invention relates to a piston cooling device for a motorcycle engine. Background technique [0002] The Chinese patent No. 201320352629.3 discloses a motorcycle engine piston cooling device, including a cylinder block, a piston, a crankshaft connecting rod assembly and a crankcase. The piston is arranged in the cylinder, the piston is connected to the crankshaft connecting rod assembly, and the crankshaft connecting rod The components are arranged in the inner cavity of the crankcase, and the oil injection nozzle connected with the oil circuit is arranged in the crankcase. When the engine is working, the oil injection nozzle injects cooling oil to the piston to cool the piston. Although the cooling device has a certain cooling effect on the piston, because there is only one fuel injection nozzle to spray cooling oil, the cooling oil is unevenly distributed on the piston, so the cooling effect is not good; at the same time, the fuel injection device of t...

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Problems solved by technology

Although the cooling device has a certain cooling effect on the piston, since there is only one oil injection nozzle spraying cooling oil, the cooling oil is unevenly distributed on the piston, so the cooling effect is not good; at the same time, the oil injection device with this structure can only be intermittent Type oil injection, when the engine is running at low speed, the piston heat load is low, no oil injection is required, at this time, the piston is still sprayed with cooling oil, thereby reducing the engine oil pressure when running at low speed

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