Preload Spring: Preload Force 10-1000 N, Spring Rate 5-200 N/mm

Component Specifications

Definition

A preload spring is a critical component in piezoelectric actuator assemblies designed to apply a constant compressive force to the piezoelectric stack or elements. This initial preload eliminates mechanical backlash, maintains electrical contact stability, prevents tensile stress during operation, and ensures consistent performance by keeping the piezoelectric material under compression even during dynamic cycling. It compensates for thermal expansion differences and mechanical tolerances within the actuator system.

Working Principle

The preload spring operates on Hooke's law (F = kx), where it applies a controlled compressive force to the piezoelectric stack. This force ensures the piezoelectric elements remain in constant contact with electrodes and mechanical interfaces, preventing separation during rapid expansion/contraction cycles. The spring maintains this force throughout the actuator's operational range, typically using coil, disc, or wave spring configurations calibrated to specific load requirements.

Materials

Stainless steel (AISI 302/304/316), music wire (ASTM A228), beryllium copper (C17200), Inconel (for high-temperature applications), titanium alloys. Material selection depends on corrosion resistance, fatigue life, temperature stability, and magnetic properties.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Spring Rate	5-200 N/mm
Fatigue Life	>10^7 cycles
Preload Force	10-1000 N
Corrosion Resistance	Salt spray test >500 hours
Operating Temperature	-40°C to +150°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10243, DIN 2093, ASTM A228

Parent Products

This component is used in the following industrial products

Piezoelectric Actuator

A precision actuator that converts electrical energy into mechanical displacement using the piezoelectric effect.

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Preload Mechanism

A mechanism that applies controlled axial force to eliminate internal clearance and ensure precise positioning in linear motion systems.

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Engineering Analysis

Risks & Mitigation

Spring fatigue failure
Corrosion in harsh environments
Creep at elevated temperatures
Resonance at specific frequencies

FMEA Triads

Trigger: Material fatigue from cyclic loading
Failure: Loss of preload force leading to actuator backlash
Mitigation: Use high-cycle fatigue materials, implement regular maintenance checks, design with safety factors

Trigger: Corrosion in humid/chemical environments
Failure: Spring stiffness degradation and eventual fracture
Mitigation: Select corrosion-resistant materials, apply protective coatings, control operating environment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% on spring rate, ±2% on preload force

Test Method

ISO 10243 compression testing, fatigue testing per ASTM E466, salt spray testing per ASTM B117

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Preload Spring

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Frequently Asked Questions

Why is preload necessary in piezoelectric actuators?

Preload prevents tensile stress on brittle piezoelectric ceramics, eliminates mechanical backlash, maintains electrical contact, and ensures consistent displacement output during dynamic operation.

What happens if preload spring force is incorrect?

Insufficient preload causes chatter, reduced precision, and potential piezoelectric element damage. Excessive preload reduces displacement range and may cause premature spring fatigue.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Preload Spring