Simply put, the subframe assembly is the skeleton of the front and rear axles, and is also an integral part of the front and rear axles. The sub-frame is not a complete frame, but a bracket that supports the front and rear axles and suspension, so that the axle and suspension are connected to the "positive frame" through it, which is traditionally called the "sub-frame". The role of the subframe is to block vibration and noise and reduce its direct entry into the car, so most of them appear in luxury cars and off-road vehicles, and some cars are also equipped with subframes for the engine. We know that the traditional load-bearing body without sub-frame, the suspension is directly connected to the body steel plate. Therefore, the suspension rocker mechanism of the front and rear axles are all loose parts, not an assembly. After the subframe is born, the front and rear suspensions can be assembled on the subframe first to form an axle assembly, and then the assembly is installed on the body together. We know that the traditional load-bearing body without sub-frame, the suspension is directly connected to the body steel plate. The main purpose of the sub-frame is to reduce the introduction of road vibration and improve the connection rigidity of the suspension system. Therefore, the car with the sub-frame will feel very solid and compact when driving.
Real picture of subframe assembly:
|Rear subframe||Front subframe|
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