Are cylinders equal to combustion chambers?

The cylinder is basically equivalent to the combustion chamber, but not completely equivalent. How to explain it?

Simply put, the section recorded as "compression ratio" inside the cylinder can be said to belong to the combustion chamber, but what about the back of the piston? There are a series of important objects such as lubrication system and connection system behind the piston. . Of course, it can also be said that the combustion chamber is absolutely in the cylinder.

Of course, the cylinder is not a place where oil and gas are mixed. Except for the new "gasoline direct injection" engine accident, the throttle is mixed with oil and gas.

Maybe people upstairs don't quite understand, if there is no combustion, where can work be done? Cylinders have many functions. Our common "four-stroke" engine refers to: suction, compression, work and exhaust. . Then these functions are completed by the cylinders in the engine in the throttle, camshaft, connecting rod and so on. . Doing work requires the cooperation of the piston, that is, at the same time of doing work, it is necessary to burn (combustion of oil-gas mixture) to expand the air and push the piston to do work.