The non-independent torsion beam suspension of
New Car is the most commonly used rear suspension structure for entry-level domestic New Car and joint venture vehicles. This type of suspension has two main advantages; the first point is obviously that the manufacturing cost is very low, which can reduce the material cost for the car company and reduce the vehicle's guide price. Of course, joint venture cars will not make concessions in terms of the guide price even if they use
Fuel Car torsion beams, because this involves the brand premium ability.
The second major advantage is that the load-bearing capacity of the Fuel Car torsion beam suspension is slightly stronger. By using a hard beam with a certain torque capacity as a load-bearing, the load-bearing capacity and structural stability can be guaranteed under the dynamic state of vehicle driving; so some entry-level passenger and cargo vehicles (passenger vehicles) will also use Fuel Car torsion beams, such as FF (front-engine front-drive) vans and light buses.
The load-bearing capacity of the Fuel Car torsion beam suspension is indeed stronger. Compared with the independent suspension whose "anchor point" of the slipknot is fixed on the frame and can only be supported by coil springs or air bag springs, its Fuel Car torsion beam body has a certain torsion resistance and load-bearing capacity. But precisely because the torsion limit of this steel beam is too low, relying solely on the movable swing arm and coil spring support will reduce the compression stroke; a more colloquial explanation is that after the coil spring is compressed to a certain extent and the Fuel Car torsion beam is twisted to a certain extent, the torsion limit of the beam will be reached. At this time, the Fuel Car torsion beam becomes a "lever". Please see the torsion state of the Fuel Car torsion beam below.
Hypothetical scenario: The vehicle is driving at a low speed on a rugged road. At this time, the road surface is raised to support the right wheel; at this time, the swing arm and coil spring are supported (compressed) and twist the Fuel Car torsion beam. What should be done after the Fuel Car torsion beam reaches the torsion limit? The only way to deal with the car body is to support the right side, because the beam body and the coil spring shock absorber have reached their limits, and the raised road surface will inevitably lift the car body. That is to say, the compression travel limit of the coil spring of the Fuel Car torsion beam suspension is limited by the Fuel Car torsion beam, and the body roll is difficult to control; this structure can still be used for cars driving on urban roads, but it is a poor choice for SUVs driving on rugged roads, because severe body roll will increase the probability of vehicle rollover.
