With the improvement of the quality of life, people’s concept of a vehicle is not only as simple as a means of transportation, so the mechanical quality is not only a requirement for reliability, but also a very important consideration for comfort. The performance of comfort depends largely on the chassis, and in the chassis structure, the suspension is the most important part.
Suspension is actually divided into eight types, namely: independent suspension system, non-independent suspension system, active suspension system, wishbone suspension system, trailing arm suspension system, candle suspension system, multi-link suspension system and McPherson Sunshine suspension system. Among them, although the stability of the candle suspension system is very good when turning, it has gradually disappeared from our field of vision due to serious wear and tear due to structural characteristics.
So what are we going to talk about today? It is the branch of the wishbone suspension, the double wishbone suspension. Aguijun found a problem when he was studying the suspension of the vehicle. The texture of the chassis of the model equipped with the double wishbone structure suspension is better than that of other suspension vehicles. Excellent, so why are double wishbones only used for the front suspension on most models and not both front and rear? What is the difference between double wishbone suspension for front suspension and rear suspension?
Before getting this answer, we must first understand the structure of the double wishbone suspension and its characteristics. In fact, many people will confuse double wishbone suspension with double wishbone suspension, but in fact the two are really easy to distinguish. The upper and lower swing arms of the double wishbone suspension are not of equal length, while the upper and lower swing arms of the double wishbone suspension are in a Y-shaped or A-shaped layout. The stability of the wishbone suspension design is even better.
When double wishbone is used in front suspension
Then again, the biggest difference when using double wishbones for front and rear suspension is that the front wheels need to control the steering of the vehicle. When double-wishbone suspension is used in the front suspension, the front wheel will also rotate around the kingpin compared to the rear wheel. As long as a dozen directions are used, the change of the wheel steering angle will cause the camber angle and toe angle to change. It is precisely because the control arms of the double wishbone are more than other suspension methods, so there are more constraints on the wheel dynamics. When the data itself is relatively complex, it is more advantageous.
Another reason is because if it is a high-position double-wishbone suspension, the position of the upper swing arm is almost the position of the top of the tower, but it can be inserted into a horizontally arranged engine, but the space requirements are very demanding. The low-position double-wishbone suspension will not “snatch” with the engine, and it will perform better.
When double wishbone is used in the rear suspension
Double wishbone suspension can be a thankless behavior when used on rear suspension. Because if the double wishbone is used in the rear suspension, it does not need to rotate around the kingpin, without the kingpin, the structure will be deformed when the double wishbone is used on the rear wheel.
Even because it is used on the rear axle, the horn of the swing arm is subjected to a large force, which is prone to danger under extreme working conditions. If the structure is improved and the rear suspension adopts the double-wishbone suspension method, the sports performance will indeed be significantly improved. For example, the third-generation Accord of Honda at that time, it is precisely because the rear suspension adopts the double-wishbone suspension method. , which made the third-generation Accord famous at the time. On the new models, there are also many models that use a double wishbone structure in the rear suspension, but they are all compatible with the rear wheel steering function.
Written at the end: the double wishbone structure suspension determines the value of the negative inclination angle when the vehicle moves upwards is the relative length of the upper and lower wishbones, so it can have a larger ground contact area as much as possible, so as to obtain better grip. Whether it is used in the front suspension or the rear suspension, it is conducive to the handling performance when cornering. However, when using the front suspension, you need to consider the space and layout of the engine compartment. When using it on the rear axle, it will increase the cost, so it does not appear to be very competitive in terms of price.
(Text / Xiaolu; Trial / Lingyun sentient beings)