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Calculation method of automobile driving force  (Dieselpartsworld) 2016-01-17   

Calculation method of automobile driving force:
Will torque divided by the radius of the wheels can be by the engine horsepower - torque output graphs found that had a relative torque values at each speed. These values tohow to convert the force to promote the actual car? The answer is very simple, that is, "divided by a length", we can get the data. Maximum torque, for example, a 1.6 liter engine is about to play a 15.0kg-m, at this time if directly even on the size of 185/ 60R14 tires, has a radius of about 41 cm, is through wheel plays a driving force for the 15/0.41=36.6 kg (in kilograms and is not the strength of the unit force, but the weight of the unit, must be multiplied by the acceleration of gravity 9.8m/sec2 is the standard unit of force "Newton").
36 kilograms force how to promote a ton of weight? And at the turn of the engine speed is not more likely to become a tire speed, otherwise the car does not fly up? Fortunately, the smart man invented the "gear", the use of different size of the gear connected to collocation, you can reduce the speed of rotation, while the torque amplification. Due to the circumference of the gear ratio is the radius ratio, therefore, small gear transmission gear to large power, rotation speed reduction ratio and torque amplification factor, is exactly equal to the two gear tooth number ratio. This ratio is called "gear ratio.


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