A muffler is a device that allows airflow to pass through and attenuates noise. It is one of the important parts of motorcycles. The quality of the energy produced by the muffler not only affects the noise of the motorcycle, but also has a great influence on the performance of the engine such as power, fuel consumption, and torque. Therefore, it is necessary for every motorcycle user to understand the noise reduction principle, structure and maintenance of motorcycle mufflers.
Maintain:
1. When it is difficult to start a cold car in winter, close the choke valve to start the engine. Pay attention to open the choke door in time after warming up the car. It is forbidden to drive at high speed for a long time when the choke valve is closed;
2. It is forbidden to install a windshield or other decorations in front of the engine and muffler in the vehicle (male car), which will affect the heat dissipation of the engine and muffler;
3. Do not drive in low gear and heavy load for a long time, which will cause damage to the engine and muffler;
4. Do not step on the accelerator at high speed for a long time;
5. When there is oil stain on the surface of the muffler, the color of the surface will change color, yellow or blue after heating the car. In addition, when there is a lot of dirt on the surface of the muffler, please clean it in time to avoid affecting its heat dissipation;
6. When installing the muffler, pay attention to install the muffler pad in place and tighten it to prevent air leakage, which will affect the muffler effect and cause yellowing at the muffler interface.
Types of mufflers: According to different muffler principles, motorcycle mufflers can be divided into the following three types:
1. Negative muffler: This kind of muffler uses the sound absorption effect of sound-absorbing materials or sound-absorbing structures to attenuate the noise propagating along the pipeline with distance, so as to achieve the purpose of noise reduction. Commonly used sound-absorbing materials include glass fiber wire, low-carbon steel wire mesh, felt, etc. This type of muffler has a good noise reduction effect on high-frequency noise, but poor noise reduction performance at low frequencies. In addition, because the sound-absorbing material is easily melted by the high-temperature exhaust gas discharged from the engine, the service life is short, and the muffler effect is easily reduced or lost by the cold such as carbon deposits and sludge. Therefore, a single resistive muffler is rarely used on motorcycles. .
2. Resistant muffler: This kind of muffler is based on the sudden expansion (or contraction) of the pipe section or the side-connected resonant cavity, so that the sound waves of certain frequencies propagating along the pipe are reflected back to the direction of the sound source at the sudden change, so as to achieve noise reduction. Purpose. It is more suitable for eliminating low and medium frequency noise, but has a poor effect on high frequency noise.
3. Impedance compound muffler: This kind of muffler is composed of the muffler principle of resistive muffler and resistive muffler through the structure, and has the muffler characteristics of both. Due to the wide frequency band of noise produced by motorcycle engine noise sources, in order to obtain better noise reduction effects in the low, medium and high frequency ranges, most motorcycles use this type of negative-resistance compound noise reduction.
Speakers, such as: Nanya ny125, honda cbx250, etc.
Chongqing xinzhongxin machinery co., ltd. (the original zhongxin machinery factory co., ltd. Has been established for more than 20 years), the main business is the research and development and production of mufflers and fuel tanks (side covers, fenders, water tanks) for three-wheeled motorcycles and sales, the products are widely used in the field of three-wheeled motorcycles and atvs. The annual production capacity can reach 300,000 sets. With the advantage of high cost performance, the company's products have been affirmed by users and sold to domestic and foreign markets.
Chen tao
384841866@qq.com