Two institutions
Generally speaking, the engine can be divided into two major mechanisms and five systems in the mechanical structure.
Gas distribution mechanism
Composition
Most gas distribution mechanism adopts the top valve type gas distribution mechanism, which is generally composed of a valve group, valve transmission group, and valve drive group. The distribution mechanism mainly includes a camshaft, valve, valve spring, straight column, putter, etc.
Role
According to the requirements of the working cycle and firing order of each cylinder of the engine, the inlet and exhaust doors of each cylinder are opened and closed at a time, so that the fresh charge can be entered into the cylinder in time, and the exhaust gas can be discharged from the cylinder in time.
Frequently asked questions
Why is there the front gear transmission part?
First of all, we need to know that when the engine is working, the valve will be periodically opened and closed, and the valve will remain closed under the action of the valve spring, The valve needs to start with the drive of the camshaft, and the drive of the camshaft comes from the crankshaft.
In the structure, the camshaft is the lower type. In the process of camshaft rotation, the CAM of the camshaft ACTS on the supporting column, and then the bolt pushes the rocker arm through the push bar, and finally, the rocker’s arm ACTS directly on the valve, which opens the valve. Cummins engine has high quality. In LandKingParts we sell Cummins engine parts for tractors, farm machinery, heavy trucks, and other large machinery. The Cummins engine has superb quality if there is a need, welcome to consult to buy.
Extended concept
Here we’re going to mention two concepts, the first one is that the camshaft that we just mentioned is the lower one, and when you look at this one, you should guess that since there’s a lower one, there should be other arrangements, yes, in general, there are three forms of camshaft layout, the lower one, the middle one and the upper one.
The second concept is the valve clearance, and we can see that the rocker arm shown in the above moving diagram is from the side of the valve and there is an adjusting bolt, which can adjust the clearance between the rocker arm and the valve. Why do you need to adjust this clearance? In the process of use, there is an appropriate value, because if the valve clearance is too large, it may lead to an insufficient stroke of the valve opening, which may affect the efficiency of the inlet, and also may increase the wear of the swingarm and valve, and affect the service life of the parts; If the air gate clearance is too small, when the engine temperature is relatively high, due to the effect of hot expansion and cold shrinkage, the rocker arm will affect the valve for a long time, so that the valve is closed strictly. Based on these reasons, it is necessary to have appropriate valve clearance to be able, of course, the better design now is to use a hydraulic support column, the advantage of a hydraulic support column is to automatically adjust valve clearance, and does not need manual adjustment, at present use this kind of design is also more.
Crank linkage mechanism
The crank linkage mechanism is the main moving part of the engine to realize the working cycle and complete the energy conversion.
Core parts of crank connecting rod mechanism: piston, connecting rod, and crankshaft
Composition
It consists of a body group, piston link group, and crankshaft flywheel group. There are also some small parts: piston pin, connecting rod tile, crankshaft tile, and piston ring. The crankshaft has crankshaft gears and flywheels on both sides.
Role
The combustion site is provided to convert the expansion pressure generated by the fuel combustion on the top of the piston into the torque of the crankshaft, and the heat generated after the fuel combustion is converted into mechanical energy, and the power output is continuously output.
