What is the purpose of a torque strut mount?

Basically, the purpose of the torque strut mount is to keep the engine and transmission from vibrating excessievely. This smooths the ride, keeps the engine/transmission from excessivel stressing the engine/rtansmission mounts on the frame, and provides for a smoother ride and better drivability. Without the torque strut mount, the top of the engine would be unsupported and damage to the drive train would occur.