Industry-Verified Manufacturing Data (2026)

Clutch Pack

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Clutch Pack used in the Motor Vehicle Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Clutch Pack is characterized by the integration of Friction plates and Steel separator plates. In industrial production environments, manufacturers listed on CNFX commonly emphasize Sintered bronze/copper friction material construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

Product Specifications

Technical details and manufacturing context for Clutch Pack

Definition
A clutch pack is a critical sub-assembly in automatic transmissions, consisting of alternating friction plates and steel separator plates stacked together. When hydraulic pressure is applied, the pack compresses to lock the plates together, transferring torque between the transmission's input and output shafts or holding planetary gearset elements stationary. It enables smooth gear shifts by selectively connecting or disconnecting power paths.
Working Principle
Hydraulic pressure from the transmission valve body acts on a piston, compressing the alternating friction and steel plates in the clutch pack. The friction material creates a bond between plates, locking them together to transfer torque. When pressure is released, return springs separate the plates, disengaging the clutch and interrupting torque flow.
Common Materials
Sintered bronze/copper friction material, High-carbon steel separator plates, Steel housing/piston
Technical Parameters
  • Overall pack thickness (compressed) (mm) Per Request
Components / BOM
  • Friction plates
    Provide friction surface for torque transfer when compressed against steel plates
    Material: Sintered metal (bronze/copper) with friction material
  • Steel separator plates
    Alternate with friction plates to create friction interfaces and dissipate heat
    Material: High-carbon steel
  • Clutch piston
    Applies hydraulic pressure to compress the plate stack
    Material: Steel or aluminum
  • Return springs
    Separate plates when hydraulic pressure is released
    Material: Spring steel
Engineering Reasoning
0.8-1.2 MPa hydraulic pressure, 80-120°C operating temperature, 0.1-0.3 mm plate clearance
1.5 MPa hydraulic pressure causes seal rupture, 150°C temperature initiates thermal glazing, 0.5 mm clearance induces chatter vibration
Design Rationale: Amontons-Coulomb friction law breakdown at 150°C causes coefficient drop from μ=0.12 to μ=0.04, Hertzian contact stress exceeding 800 MPa yields steel plates
Risk Mitigation (FMEA)
Trigger ATF degradation below JASO 1A specification (kinematic viscosity <5.5 cSt at 100°C)
Mode: Plate adhesion and torque transfer failure during 2-3 shift transition
Strategy: Integrate in-line viscometer with 0.1 cSt resolution and automatic bypass to auxiliary cooler
Trigger Piston seal leakage exceeding 15 mL/min at 1 MPa differential pressure
Mode: Incomplete clutch pack engagement causing 300-500 rpm slip during lockup phase
Strategy: Dual-lip fluorocarbon seals with 0.05 mm radial interference and laser-welded retainer rings

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Clutch Pack.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 20 bar hydraulic actuation pressure, 0-15 bar clutch apply pressure
other spec: Maximum slip speed: 5000 RPM differential, Torque capacity: 50-800 Nm depending on plate count and diameter
temperature: -40°C to 150°C (operating), up to 200°C (peak transient)
Media Compatibility
✓ Automatic Transmission Fluid (ATF) ✓ Synthetic gear oils (75W-90, 80W-140) ✓ Dexron/Mercon type hydraulic fluids
Unsuitable: Abrasive slurry environments or dry operation without lubrication
Sizing Data Required
  • Required torque capacity (Nm)
  • Available package diameter (mm)
  • Maximum allowable slip energy (J/engagement)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Friction Material Degradation
Cause: Excessive heat generation from prolonged slipping or overload conditions, leading to glazing, cracking, or complete wear of friction plates, reducing torque transmission capacity.
Hydraulic/Pneumatic Actuation Failure
Cause: Contamination (e.g., debris, moisture) or seal degradation in the actuation system, causing pressure loss, delayed engagement/disengagement, or complete failure to operate.
Maintenance Indicators
  • Burning odor or visible smoke during operation, indicating overheating and material breakdown.
  • Unusual grinding, slipping noises, or delayed/vibratory engagement, suggesting worn plates or actuation issues.
Engineering Tips
  • Implement regular fluid analysis and filtration for hydraulic/pneumatic systems to prevent contamination and maintain clean actuation.
  • Adhere to manufacturer-specified torque limits and avoid prolonged slipping; use thermal monitoring to prevent overheating and schedule cooling intervals.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems ISO 26262 - Road Vehicles Functional Safety SAE J2489 - Clutch System Performance Test Procedure
Manufacturing Precision
  • Friction Plate Thickness: +/-0.05mm
  • Pressure Plate Flatness: 0.08mm
Quality Inspection
  • Hardness Testing (Rockwell C Scale)
  • Surface Roughness Measurement (Ra ≤ 1.6μm)

Factories Producing Clutch Pack

Verified manufacturers with capability to produce this product in China

✓ 92% Supplier Capability Match Found

P Procurement Specialist from United States Feb 24, 2026
★★★★★
"Testing the Clutch Pack now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
T Technical Director from United Arab Emirates Feb 21, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
P Project Engineer from Australia Feb 18, 2026
★★★★★
"As a professional in the Motor Vehicle Manufacturing sector, I confirm this Clutch Pack meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

13 sourcing managers are analyzing this specification now. Last inquiry for Clutch Pack from Brazil (1h ago).

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Frequently Asked Questions

What is the primary function of a clutch pack in automatic transmissions?

A clutch pack engages and disengages power flow between rotating components within an automatic transmission, enabling smooth gear shifts and torque transfer.

Why are sintered bronze/copper materials used for friction plates?

Sintered bronze/copper friction materials provide excellent heat dissipation, consistent friction coefficients, and durability under high-pressure conditions in transmission systems.

How do high-carbon steel separator plates improve clutch pack performance?

High-carbon steel separator plates offer superior strength and wear resistance, maintaining precise plate alignment and preventing deformation during repeated engagement cycles.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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