What is the rear towing arm of a car
The Trailing Arm is a suspension system designed for the rear wheels, which connects the main shaft of the vehicle in front of the axle to the axle through the arm. The towing arm suspension system can be divided into full towing arm and half towing arm, the former spindle moves perpendicularly to keep the axle parallel to the body, the tilt Angle is constant and the shock absorber has no bending stress, it has the advantages of high space utilization, low friction and strong braking stability, but has the disadvantages of insufficient geometric control accuracy, weak anti-roll ability .
Structure and working principle
The core structure of the trailing arm suspension system is formed by welding the left and right longitudinal arms together through torsion beams. It belongs to the category of non-independent suspension but possesses some characteristics of independent suspension. The suspension connects the wheels to the body with a rigid drag arm and buffers with shock absorbers and springs .
Full towing arm (straight to the rear) and half towing arm (oblique to the rear) are the main forms. The main shaft rotation axis of the former is perpendicular to the centerline of the vehicle body, while that of the latter is inclined to the centerline .
Advantages, disadvantages and application scenarios
The advantages of the trailing arm suspension system include high space utilization, low friction and strong braking stability. However, it also has disadvantages such as insufficient geometric control accuracy, weak anti-roll ability, and relatively weak comfort and handling .
This suspension system is mainly used in the rear suspension systems of small cars and lower end SUVs .
Historical background and technological development
The trailing arm suspension system holds an important position in the history of automobiles, especially in the era when independent rear suspensions were not yet widespread. It was a common form of rear suspension for many mid-range and high-end models. With the development of technology, some models have been improved to a multi-link structure by adding linkages to enhance comfort and handling .
The main functions of the rear towing arm include supporting the body, filtering out vibrations, connecting the wheels to the body, and providing a certain degree of handling and comfort. Specifically:
Youdaoplaceholder0 Support the vehicle body : The towing arm rigidly connects the wheels to the vehicle body to ensure that the vehicle can stably support the vehicle body during driving and prevent excessive shaking of the vehicle body .
Youdaoplaceholder0 Filter out vibrations : The towing arm, in combination with shock absorbers and springs, can effectively filter out some minor bumps on the road, providing a relatively comfortable driving experience. However, under high shock, some of the vibrations can be transmitted into the vehicle and affect ride comfort .
Youdaoplaceholder0 Connecting the wheels to the body : The towing arm, as a component connecting the wheels to the body, ensures that the vehicle maintains a stable geometric relationship during driving and prevents excessive relative motion between the wheels and the body .
Youdaoplaceholder0 Handling and comfort : The trailing arm rear suspension is average in terms of handling and comfort. It can provide stable support when driving in a straight line, but the body roll phenomenon may be more obvious in curves. By adjusting the hardness of springs and shock absorbers, handling can be improved to some extent and roll can be reduced .
In addition, the arm is compact and does not take up too much interior space, making it suitable for small cars and rear space-oriented models .
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