What does a Twist Beam Rear Suspension mean?
2 Answers
Twist Beam Rear Suspension, also known as 'Torsion Beam Rear Suspension,' is a suspension structure specifically designed for the rear wheels. Its composition is very simple: it uses robust swing arms to achieve a rigid connection between the wheels and the body or frame, while hydraulic shock absorbers and coil springs provide a flexible connection to absorb shocks and support the body. A cylindrical or square torsion beam connects the left and right wheels. Currently, most domestic A-segment and below and low-end SUV models generally use this type of suspension system for the rear suspension, mainly because it occupies relatively little body space, has low manufacturing costs, and does not cause changes in the camber angle of the body during movement. Additionally, the shock absorbers do not experience stress bending, which would otherwise exacerbate tire wear.
The twist-beam rear suspension is a common type of automotive rear suspension, and I often encounter it when servicing compact cars. Simply put, it consists of a U-shaped or tubular crossbeam connecting both wheels. When the wheels hit bumps, the beam twists to absorb shocks instead of working independently like in independent suspensions. Its advantages include an extremely simple structure, low cost, and compact installation space, which allows for a larger trunk—making it popular in budget-friendly cars like the Volkswagen Polo or Toyota Yaris. The downside is reduced comfort; if one wheel hits a pothole, the other side also jolts, creating a slightly bumpy ride. Overall, it's an economical and practical choice for daily commuting, but cars aiming for a luxurious ride typically use more sophisticated systems.
