Top Strut Mounting (Shock Absorber Mounting)

Top strut mountings, also known as shock absorber mounts, are critical components of a vehicle's suspension system. They connect the coil spring/damper strut assembly to the vehicle's chassis, allowing for smoother and more stable driving by absorbing road shocks and vibrations. These mounts serve as a rebound stop for the shock absorber, guaranteeing proper handling and managing the camber and caster settings on the front axle. They are critical for maintaining a comfortable and safe ride since they influence the overall function of the suspension system.

Function

The function of top strut mounts is critical in the suspension system of a vehicle. They connect the shock absorber to the chassis of the vehicle, providing stability and support. These mounts allow for smooth suspension movement, absorbing road shocks and vibrations to improve ride comfort. They also help to maintain proper alignment between suspension components and wheels, which contributes to smooth steering and handling. They ensure proper vehicle handling by absorbing forces during the shock absorber's rebound and affect the front axle settings for the camber and caster, influencing the vehicle's alignment and handling characteristics.

Components

Top strut mounts are made up of the following components:

Rubber or Polyurethane Mount: This component acts as a cushion, absorbing shocks and vibrations between the strut and the vehicle's chassis.
Bearing: As a pivot point, the bearing allows the strut to rotate in relation to the chassis, allowing for smooth steering.
Plate: Performing as the framework to fix components like bolts, bearings or rubber. It could be categorized into Upper/Lower, Inner/Outer, and Bearing Plate based on their structure and method.
Nuts and bolts: These are used to hold the top strut mount to the chassis and the strut assembly.

The structure of the products can vary depending on the suspension method and the designs of the vehicles. The modern top strut mount is typically made of a strong rubber-metal element. Its primary functions are shock absorption and support, while the ball bearing allows the strut to rotate in relation to the chassis. These components work together to provide proper suspension performance and overall vehicle stability.

Failure

A Top strut mounting can fail for various reasons, but mostly by aging or mishandled condition. Road debris and pollutants can make the part start to rust; harsh vibrations and excessive pressure due to aggressive driving can stress out the system.

Symptoms of Failure

Strange Noise: A bad strut mount bearing can result in popping or cracking noises, including squeaks or clunks, especially when going over bumps or making slow steering wheel turns. This would increase noise while driving, as they usually isolate the vehicle's chassis from disturbances. Checking both mounts is advised, with a common tendency for the passenger side to fail more often than the driver's side.
Strange vibrations: The Top strut mounting is responsible to blocking suspension, and it shouldn’t be worn out, of course. However, when these parts wear and tear, the struts and chassis that were connected together will rub against each other and cause irregular vibrations.
Poor steering and handling: This part is also important in steering because it works as a pivot for the steering system. When the main system malfunctions, steering will not be as smooth as it used to be and take longer than usual. The wheel might not be aligned properly since the measurement will be disturbed. With all the conditions above, the car will bounce harder and, in the worst case, get out of control.