Subframe
From Wikipedia, the free encyclopedia
A subframe is a structural component of a vehicle, such as an automobile or an aircraft, that uses a discrete, separate structure within a larger body-on-frame or unit body to carry certain components, such as the engine, drivetrain, or suspension. The subframe is bolted and/or welded to the vehicle. When bolted, it is sometimes equipped with rubber bushings or springs to dampen vibration.
The principal purpose of using a subframe is to isolate vibration and harshness from the rest of the body. For example, in an automobile with its powertrain contained in a subframe, forces generated by the engine and transmission can be damped enough that they will not disturb passengers.
The principal disadvantage is that dividing the vehicle into several large components or subframes, rather than a single unit, reduces the overall strength and rigidity of the assembly. This is exacerbated if the subframe is used to contain heavy components like an engine.
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