The trailer axle can be integral, just like a huge barbell, with the body supported by the suspension system on both sides. Therefore, the integral axle usually cooperates with the dependent suspension; The axle can also be disconnected, like two umbrellas inserted on both sides of the car body, and then supported by the suspension system respectively. Therefore, the disconnected axle is matched with the independent suspension.
According to the different driving forms, the trailer axle is also divided into steering axle, drive axle, steering drive axle and support axle. The steering axle and the support axle belong to the driven axle. Most cars use front rear drive (FR), so the front axle is used as the steering axle and the rear axle as the drive axle; For front front drive (FF) cars, the front axle becomes the steering drive axle and the rear axle serves as the support axle.
The structure of the steering axle is basically the same, consisting of 2 steering knuckles and a beam.
The difference between the steering drive axle and the steering axle is that they are all hollow. The cross beam becomes the axle housing, and the steering knuckle becomes the steering knuckle housing, because there is a drive shaft inside.
According to the structure type of suspension, the trailer axle can be divided into two types: disconnected type and integral type. The disconnected axle is a movable joint structure, which is used together with independent suspension; The middle of the integral axle is a rigid solid or hollow beam. It is mostly equipped with dependent suspension. According to the different motion modes of wheels, the axles can be divided into four types: steering axle, drive axle, steering drive axle and support axle. Among them, the steering axle and the supporting axle belong to the driven axle. The steering axle is common to the front axle of ordinary cars, and the drive axle is common to the rear axle or the middle and rear axles; The front axle of off-road vehicles or most cars is both a steering axle and a drive axle, so it is called a steering drive axle; Some single axle drive three axle sedans (6 × 2) The middle axle (or rear axle) of is a drive axle, and the rear axle (or middle axle) is basically a supporting axle.
