May 17, 2022

Due to its own characteristics, the diesel engine has a large torque, but the power cannot go up, and the maximum speed of the machinery and equipment is determined by the maximum power of the engine, so the diesel engine is more used by people for heavy work.

The torque output from the flywheel of the diesel engine is called the effective torque, referred to as torque, which is represented by the letter Me, and the unit is N m. It refers to the heat generated by the combustion of fuel after mixing with air in the cylinder, the rotational torque generated by the expansion of the gas to do work, and the removal of the frictional resistance torque of various parts and the driving of auxiliary devices (such as fuel injection pumps, water pumps, charging generators, etc. ), the torque consumed by the crankshaft is finally transmitted to the flywheel to provide the torque used.

The force required by the diesel engine to drive or tow the chassis of the equipment is transmitted to the flywheel and becomes the counter torque that hinders the rotation of the flywheel, which is usually called the load of the diesel engine. In actual work, the torque from the flywheel of the diesel engine should be equal to the load of the diesel engine.

At the same speed, the greater the power of the diesel engine, the greater the torque. At the same power, the lower the output speed, the greater the torque. This is the key to increasing the torque by changing the output ratio when the vehicle is climbing.

For a diesel engine, the rated torque is: Me=K(Ne/n) (unit: N m).

In the formula, K is the coefficient (K=9545.50); N is the effective power of the diesel engine (kW); n is the speed of the diesel engine I (r/min).

The ratio of the maximum torque value of the diesel engine to the torque value at rated operating conditions is called the torque coefficient of the diesel engine, that is, Ki=Mz/Me ruler. In the formula, Ki is the torque coefficient of the diesel engine; Mz is the maximum torque of the diesel engine (N m); Me is the rated torque of the diesel engine (N m).

The torque coefficient represents the ability of the diesel engine to overcome external resistance. The larger the torque coefficient, the greater the ability of the diesel engine to overcome the external resistance, the stronger the climbing ability and the better the acceleration. On the contrary, it is bad.