
The automotive running system consists of four main components: the frame, axles, suspension, and wheels. The frame serves as the foundational base for the entire vehicle assembly. The axles are connected to the frame via the suspension, and the wheels are mounted on the axles. The automotive suspension refers collectively to all power-transmitting connecting devices between the frame and axles. It elastically connects the axles to the vehicle body, mitigating the impact forces caused by uneven road surfaces during driving, thereby ensuring passenger comfort and cargo integrity. The primary functions of the automotive running system are to integrate the entire vehicle into a cohesive unit, support the total vehicle weight, receive torque from the transmission system, and generate traction between the driving wheels and the road surface.

The automotive running system mainly consists of four major components: First is the suspension, which acts like the 'legs and feet' of the car, absorbing vibrations from bumpy roads. After I replaced the springs on my car, it became noticeably more stable when going over potholes. Next is the wheel assembly, where tires and rims are responsible for transmitting power to the ground. When I switched to wider tires, the mechanic specifically mentioned the need to match the suspension parameters. The body structure serves as the 'skeleton,' with unibody being the current mainstream. My car's body is made of stamped steel plates welded together. Finally, there are the axles and steering knuckles, which you can clearly feel working in tandem with the tire's steering angle during turns. Poor coordination among these components can lead to issues like uneven tire wear or pulling to one side. Last time I got a wheel alignment, it took the whole afternoon to meet the standards.

After driving for over a decade, I finally grasped the intricacies of the running gear system. It boils down to four core components: The wheels make direct contact with the road surface, where tire pressure significantly impacts fuel efficiency and traction. The axles and drive shafts transmit power – when the CV boot tears on a front-wheel-drive car, the entire half-shaft needs replacement. Suspension is paramount; double-wishbone and multi-link setups each have merits – during a recent test drive, the electromagnetic suspension notably provided superior cornering support. The chassis bears all structural loads, with body-on-frame designs maintaining rigidity better on rough terrain. The rubber bushings in these components are particularly prone to deterioration – replacing them on my older vehicle eliminated creaking noises over speed bumps and markedly improved ride refinement.

The running system can actually be broken down into three fundamental components. The chassis frame bears the weight, with unibody now dominating the mainstream. The suspension system includes springs and shock absorbers, where independent suspension offers significantly better comfort than torsion beam setups. The wheel assembly comprises components like hubs, tires, and bearings. What the tuning community often refers to as the 'running gear' precisely denotes this section. Many overlook the impact of ride height adjustments on suspension geometry when upgrading to coilovers. Pay special attention to ball joint play—last inspection revealed loose steering ball joints that nearly caused steering wheel vibrations.

The drivetrain system is more complex than imagined. The main framework is the chassis, which carries all components including the engine. Tires and wheels are responsible for rolling operations, with winter snow tires featuring deeper tread patterns for anti-slip performance. The suspension is most critical – my SUV's double-wishbone setup allows independent wheel movement over bumps for enhanced stability. The drivetrain's axles and half-shafts determine the drive configuration, where rear-wheel-drive vehicles only use front wheels for steering. Steering knuckles enable angle changes, determining turning radius. The rigidity of these components directly affects handling – track-modified vehicles reinforce all connecting parts. Regular four-wheel alignment prevents uneven tire wear.

I deal with the four major components of the running gear system every day when repairing cars. The body serves as the foundational framework, and nowadays, monocoque structures are more commonly used for enhanced safety. Worn bearings in the wheel assembly produce a humming noise. If the shock absorbers in the suspension system leak oil, they lose their vibration-damping effectiveness—last week, I replaced the control arm bushings to restore elasticity. The axle bears power transmission, with both front and rear axles in four-wheel-drive vehicles equipped with differentials. Twenty years ago, vehicles used leaf springs, but now air suspension can automatically adjust the vehicle's height. Pay special attention to suspension rubber components; when they age, they not only cause strange noises but also lead to abnormal tire wear.


