Connection structure of low-emission double-stroke gasoline engine silencer

Abstract

The invention discloses a connection structure of a low-emission double-stroke gasoline engine silencer. The structure comprises a venting flange, a silencer pad, a silencer, a flat washer, a spring washer, a bolt and a nut. The connection structure is characterized in that the venting flange is symmetrically provided with two bolt holes; one side of the venting flange, which faces to a cylinder body, is provided with two nut arrangement chambers; the center line of the nut arrangement chambers and the center line of the bolt holes are coincident; and the bolt passes through the spring washer, the flat washer, the silencer and the spring washer to be connected with the nut to fix the silencer on the venting flange. According to the connection structure, the problem that the bolt is loosened because the temperature of the silencer side is overhigh can be effectively solved.

Description

technical field [0001] The invention relates to a low-emission two-stroke gasoline engine, in particular to a muffler connection structure for a low-emission two-stroke gasoline engine. Background technique [0002] Due to its working principle, the emission of the two-stroke gasoline engine is difficult to meet the requirements of the emission regulations that have just been promulgated, so it must be purified outside the machine. Secondary combustion, therefore, in the case of meeting the emission requirements, the temperature of the flange surface of the cylinder block on the muffler side reaches between 300°C and 400°C, and the exhaust flange surface of the cylinder block is processed according to the traditional connection method. Two threaded holes, use bolts to pass through the muffler and the muffler pad to fix it on the exhaust flange of the cylinder body. However, during the operation of the machine, due to the addition of a catalyst in the muffler, the exhaust gas...

AI Technical Summary

Problems solved by technology

[0002] Due to its working principle, the emission of the two-stroke gasoline engine is difficult to meet the requirements of the emission regulations that have just been promulgated, so it must be purified outside the machine. Secondary combustion, therefore, in the case of meeting the emission requirements, the temperature of the flange surface of the cylinder block on the muffler side reaches between 300°C and 400°C, and the exhaust flange surface of the cylinder block is processed according to the traditional connection method. Two threaded holes, use bolts to pass through the muffler and the muffler pad to fix it on the exhaust flange of the cylinder body. However, during the operation of the machine, due to the addition of a catalyst in the muffler, the exhaust gas will flow in the muffler. The secondary combustion is carried out inside, and the temperature on the side of the muffler and the exhaust flange reaches above 300°C. However, the current cylinder body is made of aluminum alloy, and its tensile strength is reduced by 70% under long-term high temperature, so the tightening torque is kept at 20 % or so, it cannot meet the requirements of anti-loose use, and the phenomenon of muffler looseness often occurs

Images