How to save fuel for motorcycle with bent beam

(1) adopt new materials. On the premise of ensuring mechanical strength and service life, a large number of lightweight materials are used. For example, the cylinder block, cylinder head and flywheel shell of the engine made of aluminum alloy and magnesium alloy replace the original iron castings; The frame and rear shelf made of aluminum alloy and magnesium alloy have replaced the original steel pipes and plates. Plastics and composite materials are also widely used in motorcycles, such as plastic front and rear fenders and ABS cushion floors. Using these materials can reduce the weight of motorcycles. (2) Improve the structure to reduce the weight. The finite element analysis method is used to optimize the size and related structure of motorcycle parts, and reduce the weight while meeting the strength and use requirements. 2. Reduce the motorcycle driving resistance. Motorcycle running resistance consists of air resistance, wheel rolling resistance, acceleration resistance and climbing resistance. Among them, air resistance and rolling resistance have great influence on fuel consumption. (1) Reduce air resistance. The air resistance of motorcycle is related to the shape of the vehicle, the air resistance coefficient is directly proportional to the square of the speed, and the power required to overcome the air resistance is cubic with the speed. According to the data, if the motorcycle runs at a speed of 20km/h, about 50% of the power generated by the engine is consumed in overcoming air resistance; When the vehicle speed is greater than 70km/h, the energy consumed to overcome the air resistance will account for about 90% of the engine work. When the motorcycle runs at high speed, the air resistance has a very significant impact on fuel economy. The reduction of air resistance is achieved by studying the shape of the car body and obtaining reasonable streamline, especially on scooters. In 1970s, the air drag coefficient of scooters was 0.58-0.78, but by the beginning of 20th century, it had been reduced to about 0.3. When riding a motorcycle, fairings and streamlined peripheral guards are usually used to reduce the drag coefficient. (2) Reduce the wheel rolling resistance. Wheel rolling resistance is related to road surface, vehicle speed, tire structure, material and air pressure. On good roads, the fuel consumption of motorcycles is less than that on poor roads 15%-30%. Therefore, improving the road surface will save considerable fuel. Radial tire is a kind of tire that can reduce rolling resistance, which can effectively reduce the rolling resistance coefficient at various speeds. Generally speaking, the fuel consumption of motorcycles using radial tires can be reduced by 3%-5% compared with those using bias tires. 3, engine power matching According to the load characteristics of the engine, we can know that only when the throttle opening is large and the load power is high, the fuel consumption rate of the engine is the lowest and the fuel economy of the motorcycle is the best. Therefore, the power selection should be as small as possible. As long as the power requirements of motorcycles can be met, the resistance power of the highest gear will account for about 80%-90% of the engine power. Under the same driving conditions, the economic fuel consumption of 125mL motorcycle can be reduced by 5%-150mL compared with150ml motorcycle. Good engine matching is one of the most practical methods to effectively reduce fuel consumption. 4. The improved design of motorcycle engine (1) adopts secondary air intake and fuel injection technology. The optimal control of air-fuel ratio and ignition timing can make the engine realize lean combustion, which can not only ensure the maximum power of the engine, but also save fuel and reduce emissions. Electronic gas supply and electronic fuel injection of engines belong to this kind of technology. Relevant comparative tests show that the fuel consumption can be reduced by 15%-20% by using this technology. (2) Improve the structure of the engine. Under the condition of no obvious increase in pollutant emission, improve the compression ratio and the combustion system of the engine, such as optimizing the combustion chamber structure, rationally arranging spark plugs, adopting multi-valve structure, increasing the intake and exhaust structure, improving the intake and exhaust ports of the engine, improving the formation conditions of mixed gas, improving the intake and exhaust efficiency of the engine, etc., so as to effectively improve the thermal efficiency of the engine, increase the power output of the engine and reduce the fuel consumption rate of the engine. Second, take measures to save fuel 1 and drive the motorcycle at a reasonable speed and gear (1). Reducing the number of stops and accelerations, maintaining a relatively stable vehicle speed and choosing an appropriate economic vehicle speed are important ways to reduce the operating fuel consumption. According to statistics, if you drive at a steady speed, the fuel consumption per kilometer is only 30%-40% of that of accelerated driving. According to the fuel consumption curve of the engine, it can be seen that the economic fuel consumption of the engine is in the range of medium speed, generally between 3000 r and 4000 r/min. Below this speed, the flow rate of mixed gas will decrease, resulting in uneven mixing, poor combustion and high fuel consumption. Above this range, in order to give full play to the maximum power of the engine, the carburetor will supply more concentrated gas and the fuel consumption will increase. Therefore, in order to save fuel, it is necessary to always control the engine speed in the middle speed range and control the throttle in the middle position during operation. It is necessary to choose a suitable gear while ensuring the stability of the vehicle speed as much as possible. Under the same road conditions and speed, although the power released by the engine is the same, the lower the gear, the greater the reserve power, the lower the engine load rate and the higher the effective fuel consumption rate. At this time, if you use high gear, the opposite is true. The economical driving method is: don't shift to low gear when the possibility of driving in high gear is not exhausted. (2) When riding a motorcycle, some good driving habits can also save fuel. Soft start, step-by-step shift control from low to high, makes the engine output power match the load, and the engine has good atomization effect and good operation, which is conducive to full combustion of fuel, so that the engine can obtain the best working condition, thus saving fuel. When the motorcycle stops or slows down, slowly return to the throttle. If the throttle is suddenly turned off, it is easy to cause the engine speed to suddenly decrease, resulting in drag torque and consuming part of the driving kinetic energy. Moreover, due to the inertia, the gasoline sprayed from the throat will enter the cylinder under the inertia, which will inevitably lead to an increase in fuel consumption. In addition, when driving, reducing good driving habits such as braking and wearing tight clothes can reduce fuel consumption. 2. Correct maintenance and adjustment of motorcycles. Whether the maintenance and adjustment of motorcycles are timely and correct will affect the working performance of engines and the running performance of motorcycles, and have a direct impact on the fuel consumption of motorcycles. (1) To ensure the motorcycle has good ignition performance, the spark plug should have enough sparks. Select the appropriate spark plug model, remove the carbon deposit on the spark plug, and check the electronic igniter and ignition coil. (2) Clean the air filter in time. Every 4000km, use compressed air to blow off the dust on the filter element of paper core air filter or clean the sponge filter element of sponge air filter, so that enough air can enter the cylinder to participate in combustion, improve air intake efficiency and reduce power loss. (3) Cleaning and adjustment of carburetor. The ideal air-fuel ratio (also called air-fuel ratio) is 14.9: 1. A good carburetor should adjust the air-fuel ratio to 22: 1 when supplying fuel at medium speed, and the fuel can't burn completely at this time. Only by providing more air can the fuel burn completely, thus achieving the purpose of saving fuel. Three measures can be taken to adjust the fuel supply of carburetor: one is to reduce the oil level in the float chamber, the other is to reduce the diameter of the main metering hole, and the third is to reduce the position of the main oil needle to reduce the cross-sectional area through which fuel passes. When reducing the fuel supply, we should give consideration to the acceleration and maximum speed of the motorcycle to make it have a considerable level, and then the fuel consumption will be reasonable and economical. The rest, such as the adjustment and good lubrication of the engine, the lubrication of the front and rear wheel bearings, the positioning of the front and rear wheels, the adjustment of the chain tightness, and the adjustment of the braking clearance of the front and rear wheels, can reduce the power loss during the running of the motorcycle, thus achieving the purpose of saving fuel. To sum up, reducing fuel consumption is closely related to the motorcycle's dynamic performance, emission status, structural design, new technology, new materials, maintenance adjustment and service conditions. Motorcycle designers and users should try their best to take measures to tap the potential of reducing fuel consumption in order to cope with the current situation of fuel shortage.