Shanghai Siken Industries Inc.

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Accumulator Suspension Function

In a vehicle suspension system (especially hydropneumatic or hydraulic active/semi-active suspensions), the accumulator has several important functions:

1. Acts as a Gas Spring

•  The nitrogen gas inside the accumulator is compressed when the suspension compresses (wheel hits a bump).

•  This compressed gas provides the spring force that supports the vehicle weight.

•  It creates a progressive spring rate: soft for small bumps and firmer for larger impacts.

2. Shock Absorption / Energy Absorption

•  Absorbs sudden pressure spikes and impact energy from road irregularities.

•  Reduces harsh shocks transmitted to the vehicle body, improving ride comfort.

•  Protects the hydraulic cylinders, valves, and other suspension components from high-pressure peaks.

3. Volume Compensation

•  Compensates for changes in hydraulic fluid volume caused by temperature variations or minor leakage.

•  Helps maintain consistent system pressure and ride height.

4. Improves Responsiveness and Damping Control

•  Quickly absorbs excess fluid during compression and releases it during rebound.

•  Helps the suspension respond faster to changing road conditions.

•  In active systems, it supports rapid pressure adjustments for better handling and stability.

5. Pressure Stabilization

•  Smooths out pressure fluctuations in the hydraulic circuit.

•  Maintains more consistent damping force and system performance.

 

These functions are why suspension accumulators (often diaphragm or bladder type) are essential in systems like Citroën hydropneumatic suspension, truck/bus hydraulic suspensions, and modern active suspension systems.