Torque is a special kind of torque that causes an object to rotate. The torque of the engine is the torque that the engine outputs from the crankshaft end. It is inversely proportional to the engine speed under the condition of fixed power. The faster the speed, the smaller the torque, and vice versa, it reflects the load capacity of the car within a certain range.
The external torque is called torque or external force moment, and the internal one is called internal torque or torque.
Basic Information
Chinese name:Torque
Foreign name:Torque
Force and:Engine torque
Pound ruler:Crankshaft output
weight:Range of load capacity
product:External force moment
Formula calculation
Overall, the driving force of a car can be calculated by the following formula:
formula
Driving force=torque×transmission gear ratio×final gear ratio×mechanical efficiency÷tire radius (unit: meter)
Summary: 1kgm=9.8Nm1lb-ft=0.13826kgm1lb-ft=1.355Nm
In the case of a certain displacement, the cylinder diameter is small, and the cylinder with a long stroke pays more attention to the torque, and the rotation speed is not too high, and is suitable for a vehicle that requires a large load. The cylinders with large bore diameter and short stroke are more focused on power output, and the rotational speed is usually higher, which is suitable for fast running vehicles. Simply put: power is proportional to torque × speed.
Calculation
Why is the power of the engine calculated from the torque?
Power P = work W ÷ time t work W = force F × distance s, so P = F × s / t = F × speed v
Here v is the linear velocity, and in the engine, the linear velocity of the crankshaft = the angular velocity of the crankshaft ω × the crankshaft radius r, substituted into the above formula: power P = force F × radius r × angular velocity ω; and force F × radius r = Torque
It is concluded that the power P = torque × angular velocity ω so the power of the engine can be calculated from the torque and the rotational speed.
The unit of angular velocity is radians/second. In the arc system, a π represents 180 degrees.
