The Difference Between Compound Torsion Beam and Torsion Beam
3 Answers
The main difference between a compound torsion beam and a torsion beam is that the compound torsion beam rear suspension includes an additional composite torsion beam, which ensures comfort while providing optimal handling performance. Most new car models now adopt this type of suspension. Below is an introduction to shock absorbers and suspension systems: 1. Introduction to Shock Absorbers: Shock absorbers are primarily used to dampen the oscillations from the rebound of springs after absorbing shocks and impacts from the road. When driving on uneven surfaces, although the shock-absorbing springs can filter out road vibrations, the springs themselves still undergo reciprocating motion, and the shock absorbers are designed to suppress this spring bounce. If the shock absorbers are too soft, the car body will bounce up and down; if they are too hard, they will create excessive resistance, hindering the normal operation of the springs. 2. Introduction to Suspension Systems: A car's suspension system is divided into two types: non-independent suspension and independent suspension. In a non-independent suspension, the wheels are mounted at both ends of a solid axle, so when one wheel moves, the other wheel also moves accordingly, causing the entire car body to vibrate or tilt. In an independent suspension, the axle is split into two sections, with each wheel independently installed under the frame via a coil spring. When one wheel moves, the other wheel is unaffected, allowing both wheels to move independently, thereby improving the car's stability and comfort.
When studying car structures, I found that the torsion beam is a simple form of rear suspension, using a single beam to connect both wheels. It offers basic shock absorption but is low-cost and easy to repair, making it suitable for urban commuter cars. The compound torsion beam adds some linkage systems, such as a Watt's linkage or auxiliary arms, which better control wheel bounce, improve cornering stability, and reduce body roll, making it ideal for vehicles that prioritize driving enjoyment. The difference lies in structural complexity—the former is affordable and practical for daily driving, while the latter offers finer handling but at a higher price, with noticeable differences when driving on bumpy roads. For car selection, a standard torsion beam is sufficient for those on a budget, while those seeking more comfort should consider the compound version.
After driving for a long time, I feel that the torsion beam suspension has obvious shaking on bumpy roads, making the rear of the car unstable and prone to swaying from side to side. Its simple design saves money and is quick to maintain. The compound torsion beam, by adding links, makes the body more solid, much more stable during high-speed turns, and provides more precise steering feedback. The main differences lie in handling and comfort. The standard version is suitable for city commuting on flat roads, while the compound version ensures better safety on long-distance or winding roads. However, I should mention that the compound version is slightly more complex to repair. When choosing a car, just pick based on the roads you frequently drive on.
