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Clutch piston Component – Motor Vehicle Manufacturing

Component Specifications

Definition

A precision-engineered cylindrical component within automotive and industrial clutch assemblies that converts hydraulic pressure into mechanical force to compress clutch plates, enabling torque transfer between rotating shafts. It operates within sealed hydraulic circuits and requires exact dimensional tolerances for proper sealing and pressure application.

Working Principle

The clutch piston operates on hydraulic pressure principles. When pressurized fluid enters the piston chamber, it forces the piston to move axially against return springs, compressing the clutch pack friction plates against reaction plates. This creates frictional engagement that transfers torque from the input to output shafts. Pressure release allows springs to retract the piston, disengaging the clutch.

Materials

Typically aluminum alloys (A356, 6061) for lightweight applications or steel alloys (4140, 8620) for high-pressure systems. Sealing surfaces often feature hard anodizing or chrome plating. Seals are made of nitrile rubber (NBR), fluorocarbon (FKM), or polyurethane for hydraulic compatibility.

Technical Parameters

Hardness 70-90 Shore A (seals), 80-100 HRB (metal)
Stroke Length 5-25 mm
Diameter Range 50-200 mm
Surface Finish Ra 0.4-0.8 μm
Temperature Range -40°C to 150°C
Operating Pressure 10-30 bar

Standards

ISO 3601, DIN 3771, SAE J514

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Clutch piston.

Parent Products

This component is used in the following industrial products

Clutch Pack

A multi-plate friction assembly within an automatic transmission that engages and disengages power flow between rotating components.

View Product Details

Engineering Analysis

Risks & Mitigation

Hydraulic fluid contamination
Seal extrusion under high pressure
Thermal expansion mismatch
Cavitation damage during rapid disengagement

FMEA Triads

Trigger: Seal hardening from elevated temperatures
Failure: Fluid leakage leading to insufficient clutch engagement pressure
Mitigation: Use high-temperature resistant seal materials (FKM) and implement cooling circuits

Trigger: Abrasive particles in hydraulic fluid
Failure: Scoring of piston sealing surfaces causing leakage paths
Mitigation: Install fine filtration (10μm) and regular fluid analysis

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Diameter: ±0.02 mm, Concentricity: 0.05 mm TIR, Surface finish: Ra 0.4-0.8 μm

Test Method

ISO 3601 for seal compatibility, SAE J514 for hydraulic fittings, pressure testing per ISO 6605

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes clutch piston failure?

Common failures include seal degradation from heat/contamination, scoring of sealing surfaces, corrosion from moisture in hydraulic fluid, and fatigue cracking from pressure cycling.

How do you test clutch piston performance?

Testing involves pressure decay tests for seal integrity, stroke measurement under load, leakage rate verification, and endurance cycling under operational temperature ranges.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Clutch piston