A hundred years ago cars didn't have engine mounting. People directly calculate the location, put the engine on the chassis, bolted up, simple and lightweight, but also cost savings. But over time, people realized that this approach was unreliable.
We know that the piston moves in a straight line in the engine and the crankshaft rotates. The movement of the connecting rod is more complex. The small head of the connecting rod moves up and down with the piston while the big head of the connecting rod pushes the crankshaft to rotate. This will lead to the internal imbalance of the engine, especially the three-cylinder machine (the first and second moment imbalance) and the four-cylinder machine (the second order force imbalance). Combined with the internal combustion pressure of the cylinder, the dynamic force transmitted by the powertrain and so on, the engine will produce violent vibration.
It would be fine if the vibrations only affected comfort, but the problem is that these vibrations often tear the retaining bolts or the engine/body connection, and that's a big problem. What if an unpowered car breaks down in the middle of nowhere, where there are wild animals and bad people? .
So, in the 1930s, engineers set out to solve this problem. "Since the vibration is big, how about adding some sponge?" "Sponges are too soft, add rubber instead." In this way, engineers use vulcanized rubber blocks as a bridge between the engine and the body, trying to avoid a collision between the two through the flexibility of rubber.This was the most widely used rubber engine mounting and is still widely used today.
