What are the two major mechanisms of an engine?
2 Answers
The two major mechanisms of an engine are the crank-connecting rod mechanism and the valve train. The valve train mainly includes components such as the camshaft, valves, valve springs, tappets, and push rods, while the core components of the crank-connecting rod mechanism are the piston, connecting rod, and crankshaft. Function of the valve train: According to the working cycle and firing order requirements of each cylinder in the engine, the valve train opens and closes the intake and exhaust valves of each cylinder at the right time, allowing fresh air to enter the cylinder promptly and exhaust gases to be expelled from the cylinder in a timely manner. During the compression and expansion strokes, it ensures the sealing of the combustion chamber. Function of the crank-connecting rod mechanism: It provides a combustion space, converts the expansion pressure of the gas generated after fuel combustion acting on the piston top into the rotational torque of the crankshaft, transforms the thermal energy released by fuel combustion into mechanical energy, and continuously outputs power. Engine working principle: The working chamber of a reciprocating piston internal combustion engine is called the cylinder, with the inner surface of the cylinder being cylindrical. The piston that reciprocates inside the cylinder is hinged to one end of the connecting rod via the piston pin, while the other end of the connecting rod is connected to the crankshaft. The crankshaft is supported by bearings on the cylinder block and can rotate within the bearings, forming the crank-connecting rod mechanism. When the piston reciprocates inside the cylinder, the connecting rod drives the crankshaft to rotate.
I often get asked this question, and as someone who frequently deals with engine repairs, I clearly understand that the two core mechanisms of an automobile engine are the crank-connecting rod mechanism and the valve train. The crank-connecting rod mechanism includes the piston, connecting rod, and crankshaft, and its function is to convert the thrust generated when you press the accelerator pedal from up-and-down motion into rotational motion, driving the wheels forward. The valve train involves components such as valves and camshafts, responsible for timing the opening and closing of the intake and exhaust valves, ensuring the engine inhales fresh air and expels exhaust gases for efficient combustion. These two parts work in coordination: without the crank-connecting rod, the engine wouldn't move; without the valve train, fuel wouldn't burn smoothly. I believe that while driving, you should pay attention to changes in the engine's sound—if the noise increases, it might indicate wear in these mechanisms. I recommend regularly changing the engine oil to lubricate critical parts, reducing component friction and overheating issues, which can extend the engine's lifespan and prevent unexpected failures. From my experience, neglecting these can lead to a sharp increase in fuel consumption or even breakdowns on the road—don't underestimate these fundamental principles.
