Automobile powertrain - Rear suspension - Supporting components function
The supporting components between the automotive powertrain and the rear suspension serve as the "bridge" to connect the upper and lower parts: they transfer the weight and dynamic loads of the powertrain to the vehicle body, isolate the road impact, and ensure the stability of the relative positions.
Let's break it down into two parts:
Powertrain suspension (supporting the engine/motor)
Supporting and positioning: Bearing the weight of the powertrain and maintaining the position stable during driving, avoiding interference with surrounding components.
Vibration isolation and noise reduction: Rubber, hydraulic or air suspension reduces the vibration from the engine/motor and attenuates the noise and shake inside the vehicle.
Limitation and protection: Acceleration, deceleration, and cornering inhibit excessive displacement of the powertrain to prevent collisions with other components.
Rear suspension supporting components (supporting the wheels and the vehicle body)
Supporting the vehicle body: The rear tie rod, support arm, etc. connect the vehicle body and the rear axle, providing structural support and maintaining the stability of the vehicle body.
Transmission and buffering: Transfer the road impact force to the spring shock absorber, buffer the vibration, and attenuate the impact, improving the comfort.
Guidance and positioning: Control arm, knife arm, etc. guide the wheels to move along the trajectory, maintaining the positioning angle (inclination, camber), ensuring straight driving and corner stability.
In summary, the side supporting components of the powertrain mainly address "no shaking of power, no displacement of position", while the side supporting components of the rear suspension address "no jolting on the road, no swaying during cornering". Together, they determine the smoothness and handling of the vehicle.
Faults in the powertrain components, rear suspension, and supporting components of the vehicle usually indicate abnormal power output from the engine/motor and transmission system. When combined with the structural or performance failure of the rear suspension supporting components (springs, shock absorbers, bushings, etc.), both may occur independently or influence each other.
Powertrain faults are often caused by problems in the fuel/ignition/lubrication system, sensor or ECU control abnormalities, etc.; faults in the rear suspension supporting components are often manifested as oil leakage in the shock absorber, spring fracture or fatigue, wear of the bushing, aging and wear of the support arm/axle housing, etc., resulting in vehicle body tilting, abnormal noise, tire wear unevenly, and unstable driving.
Powertrain faults
Common manifestations: The dashboard lights up the powertrain fault indicator, accompanied by power loss, weak acceleration, gear shifting judder, increased fuel consumption or engine shaking.
Main causes: Problems in the fuel system (fuel pump, injector, filter), ignition system (spark plug, ignition coil), sensor or wiring, and mechanical component wear (piston ring, valve, etc.).
Handling suggestions: First, read the fault codes to determine the direction; if the power suddenly drops while driving, slow down and stop safely in a safe area, restart and if the light is still on, it is recommended to contact a tow truck for repair, do not force drive.
?? Faults in the rear suspension supporting components
Common manifestations: One side of the vehicle sinks or the height is inconsistent on both sides, obvious jolting sensation, abnormal noise from the chassis (creaking/creaking sound), tire wear unevenly (scratching), swaying or fishtailing at high speed.
Main causes: Oil leakage or failure of the shock absorber, fracture or fatigue of the suspension spring, wear or aging of the control arm/axle housing, deformation of the stabilizer bar link.
Handling suggestions: Visual inspection of the oil stains in the shock absorber and the deformation of the spring; measure the height of the vehicle body; if the bushing is damaged, raise the vehicle to observe for cracks, bulges or aging of the rubber. After replacing the spring, it is recommended to redo the four-wheel alignment to avoid continued uneven tire wear.
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