1. Load & Stiffness Design

Calculate static load from vehicle curb weight, payload and axle load distribution.

Determine spring rate (stiffness) to match ride comfort and handling performance.

Ensure linear or progressive stiffness as required by suspension layout.

Verify working load under full load, empty load and extreme driving conditions.

2. Deflection & Working Stroke

Design total deflection within allowable range to avoid solid height contact.

Match spring stroke with suspension travel (jounce and rebound).

Control free length, solid length and working height strictly for assembly clearance.

3. Material Selection

Prefer silicon manganese steel (65Si2Mn) or chromium vanadium steel (50CrVA) for fatigue resistance.

Select materials with high tensile strength, good toughness and anti-fatigue performance.

Ensure resistance to vibration, impact and long-term cyclic loading.

For harsh environments, adopt surface anti-corrosion treatment.

4. Fatigue & Dynamic Performance

Analyze cyclic fatigue under continuous road vibration.

Limit maximum shear stress to prevent fatigue fracture.

Optimize wire diameter and coil diameter to reduce stress concentration.

Meet long service life requirements for vehicle durability standards.

5. Structural Parameters

Reasonably design wire diameter, mean coil diameter and total coils.

Control pitch to ensure uniform force during compression.

Design closed and ground ends for stable seating and vertical force bearing.

Keep proper coil clearance to avoid coil friction during operation.

6. Stability & Anti-Side Deflection

Calculate slenderness ratio to prevent spring buckling under compression.

Match spring guide and seat structure to reduce lateral offset.

Optimize spring geometry to adapt to suspension swing angle.

7. Surface Treatment & Environmental Resistance

Apply shot peening to improve fatigue strength.

Use electrophoretic painting, powder coating or zinc plating for anti-rust and anti-corrosion.

Resist mud, water, dust and temperature variation in road conditions.

8. Assembly & Matching Tolerance

Control dimensional tolerances for fit with spring seats, shock absorbers and brackets.

Guarantee perpendicularity and flatness of spring ends.

Match installation space of the suspension module.

9. Noise & Vibration Suppression

Avoid abnormal collision and friction between coils.

Cooperate with rubber buffer pads to reduce vibration and squeaking noise.

Concise Short Version (for catalog / technical sheet)

Rational load calculation and proper spring rate

Sufficient working stroke without solid contact

High-grade spring steel for fatigue durability

Optimized structure to lower stress concentration

Good vertical stability and anti-buckling ability

Reliable anti-corrosion & surface strengthening treatment

Precise dimensions for suspension assembly matching

Low noise and stable dynamic performance