New Law for Fuel Saving of Belt Drive Motorcycles
With the increasing shortage of oil resources, “fuel saving” has become an important theme all over the world, especially those with huge fuel consumption The automobile and motorcycle industry is continuously improving through technical means in order to control the fuel consumption to a minimum. Here, let’s take a look at the results of motorcycle fuel saving.
The scooter is very popular among urban motorcycle enthusiasts, especially women, because of its convenient operation and comfortable riding. With the gradual improvement of road conditions in my country, most areas are already connected to roads from villages to villages, and scooters have entered the countryside one after another. In addition, some companies have gradually improved the off-road performance of scooters, so the demand for scooters is increasing. . However, most of the scooters are belt-driven and infinitely variable. Coupled with the characteristics of the final transmission mechanism, the fuel consumption is generally large. Although there are many kinds of fuel-saving devices on the market, their promotion is often limited due to complicated installation and short lifespan. Through theoretical analysis and a large number of experiments, the author has obtained a fuel-saving method, which is now recommended to the majority of motorcycle enthusiasts.
1 Theoretical analysis
It can be seen from the principle of belt drive and infinitely variable speed change: at low speed, as shown in Figure 1, the diameter of the front pulley is smaller, and the diameter of the rear pulley is smaller. Larger, the transmission is relatively large to ensure that the vehicle starts quickly. With the increase of the engine speed, the six balls in the front pulley move outward along the inclined slide on the moving plate under the action of centrifugal force, because the support plate on the right side of the moving plate is fixed and can only be 6 The ball pushes the moving plate to the left, and because the fixed plate is not moving, the left movement of the moving plate causes the distance between the fixed plate and the moving plate to narrow. Because the belt width is constant, the belt will be squeezed out of the pulley. Round (a bit wider here), the front pulley gets bigger. And because the length of the belt is fixed, when the front pulley becomes larger, the belt will overcome the pressure of the rear pulley spring and move along the inner circle of the pulley, the rear pulley becomes smaller, the transmission ratio becomes smaller, and the vehicle becomes high speed, as shown in Figure 3. shown. Conversely, when the engine speed decreases, the ball moves inward, the moving plate moves to the right, the front pulley becomes smaller, and the rear pulley becomes larger, the transmission ratio becomes larger, and the vehicle becomes low-speed, which is the infinitely variable transmission principle of belt drive.
It can be concluded from the above analysis that if the diameter of the front pulley increases in the initial state (idle speed), then in each speed section of the motorcycle engine, the diameter of the front pulley increases accordingly, and the rear pulley increases accordingly. The diameter of the pulley is correspondingly reduced, thereby reducing the transmission ratio of each speed section, that is, under the same number of revolutions of the engine, the improved vehicle should travel more distance, which is to save fuel.
2 Scheme Design
The size of the initial state of the diameter of the front pulley is actually determined by the length of the sliding sleeve in the middle of the moving plate. In order to increase the diameter of the front pulley in the initial state, the moving plate must be moved to the left, but at the same time the position of the fixed plate cannot be changed, because the change of the position of the fixed plate will affect the front and rear pulleys in the same plane, which may be damaged. belt. To achieve the above two points, the only way is to shorten the length of the sliding sleeve, let the moving plate move to the left with the left movement of the supporting plate, and add a thickness of the same thickness as the shortened length of the sliding sleeve on the right side of the supporting plate. Spacers, but not too many, so as not to affect the performance of the original car, and the length of the sliding sleeve should not be shortened too much.
3 Scheme Implementation
According to the different fixing methods of the support plate, it can be roughly divided into two methods:
a) gy6 , honda dio50 and other models, the support plate is firmly pressed on the boss of the crankshaft by the sliding sleeve, the fixed plate, and the fastening nut of the crankshaft power output end. This kind of model is more convenient to improve. Remove the front pulley, measure the length of the original sliding sleeve, remove it on the lathe by 3mm, and install a gasket with a 3mm inner hole slightly larger than the diameter of the crankshaft on the crankshaft during installation, and reassemble the components.
b) Jinan Qingqi ag series, because the support plate is fixed by the pressure of the spline and the tightening nut transmitted from the sliding sleeve, so the operation is a little more complicated. When installing, first add a gasket with a thickness slightly larger than the length of the exposed spline at the spline at the installation position of the support plate to fasten the electric starter plate, add another gasket to make the sum of the thickness of the two gaskets equal to 3mm, and then re-install All parts are sufficient.
No matter which method is used, it should be noted that the clearance between the inner hole of the gasket and the crankshaft should not be too large, so as not to affect the dynamic balance of the original crankshaft.
4 Test fuel consumption
The two cars I tested were the original imported honda dio50 produced in 1986 and the Qingqi ag50 produced in 1993 , The fuel consumption of the two cars before the improvement is very large. After the latter two cars are shortened by 3mm through the sliding sleeve, some parameters of the two cars are compared.
The data shows that despite the loss of some climbing ability after the improvement, the acceleration of the vehicle becomes smooth, especially the fuel consumption problem that the majority of motorists are concerned about has been greatly improved. This improvement is simple to operate, and the majority of motorcycle enthusiasts may wish to try it.
honda dio50 car
Project fuel consumption per 100km l Maximum speed km/h 0~40km/h acceleration time, s gradeability
Before improvement 5.66 Approx. 62 11 Good
After improvement 4.4 about 71 9 Slightly worse than before improvement
Qingqi ag50
Project fuel consumption per 100 kilometers l Maximum speed km/h 0~ 40km/h acceleration time, s gradeability
before improvement 6.1 about 40 15
after improvement 4.8 about 52 16 slightly worse than before improvement
