Clutch Assembly

Product Specifications

Technical details and manufacturing context for Clutch Assembly

Definition

The clutch assembly is a critical component within the clutch/brake system that enables smooth engagement and disengagement of power flow from the engine to the transmission. It allows for gear changes, vehicle starting from rest, and temporary disconnection of power during braking or idling. This directory entry covers the general scope of clutch assemblies used in motor vehicle manufacturing, focusing on friction-type clutches. The assembly typically includes a friction disc, pressure plate, diaphragm spring, and cover, operating in conjunction with the flywheel and release mechanism. Key selection inputs include clutch disc diameter (180–430 mm), torque capacity (150–1200 N·m), maximum engine speed (6000–8000 rpm), operating temperature range (-40 to 120°C), clutch pedal effort (100–150 N), disc runout (≤0.15 mm), facing coefficient of friction (0.35–0.45), diaphragm spring load (4000–8000 N), weight (4–15 kg), and spline size (20–50 mm). These parameters are reference ranges and must be verified for the specific vehicle model and application. The assembly interfaces with the engine flywheel and transmission input shaft, and its spline must match the transmission. Verification questions include confirming the clutch disc diameter and spline size against the transmission, checking torque capacity against engine peak torque, and ensuring operating temperature limits are not exceeded. Maintenance signals include clutch slippage, shudder, or abnormal noise, which may indicate worn friction material or excessive runout. Failure boundaries include exceeding the maximum engine speed or operating temperature, which can degrade friction material and reduce torque capacity. Standards such as ISO 2685, ISO 12214, ASTM D1894, and DIN 5480 are referenced for dimensional and performance verification, but compliance must be confirmed with the legal manufacturer or supplier.

Working Principle

The clutch assembly operates on the principle of friction. When engaged, pressure plates clamp the friction disc against the flywheel, transmitting torque through friction. When disengaged (clutch pedal depressed), the pressure is released, separating the friction disc from the flywheel and interrupting power transmission. The diaphragm spring provides the clamping force, and the release mechanism (e.g., throw-out bearing) overcomes this force to disengage. The friction material, which may be organic, ceramic, or metallic, provides the necessary coefficient of friction. The assembly must be balanced to avoid vibration at high speeds, and the disc runout must be minimized to ensure smooth engagement.

Common Materials

Steel, Friction material (organic, ceramic, or metallic), Cast iron

Technical Parameters

Parameter	Typical range	Notes & selection driver
Clutch Disc Diameter	180–430 mm	Determines torque capacity; larger for heavy-duty applications.ISO 2685
Torque Capacity	150–1200 N·m	Must exceed engine peak torque with safety margin.ISO 2685
Max Engine Speed	6000–8000 rpm	Balanced for high-speed operation without vibration.
Operating Temperature	-40–120 °C	Friction material degrades above 120°C.
Clutch Pedal Effort	100–150 N	Higher effort reduces driver comfort.ISO 12214
Disc Runout	≤0.15 mm	Excessive runout causes shudder and wear.ISO 2685
Facing Coefficient of Friction	0.35–0.45	Lower values reduce torque capacity.ASTM D1894
Diaphragm Spring Load	4000–8000 N	Ensures proper clamp load on disc.
Weight	4–15 kg	Lighter reduces rotating mass and inertia.
Spline Size	20–50 mm	Must match transmission input shaft.DIN 5480

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

Components / BOM

Friction Disc Part
Provides friction surface to transmit torque between flywheel and pressure plate

Material: Steel core with friction material facing
Pressure Plate Part
Applies clamping force to engage the friction disc against the flywheel

Material: Cast iron or steel
Clutch Cover
Houses the pressure plate and spring mechanism, mounts to the flywheel

Material: Pressed steel
Release Bearing
Transmits force from the clutch fork to disengage the pressure plate

Material: Steel with bearing material
Diaphragm Spring
Supplies the clamping load that holds the disc against the flywheel.

Applied To / Applications

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

Clutch/Brake System

View system integration details

Manufacturers of Clutch Assembly

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Frequently Asked Questions

What is the typical torque capacity range for a clutch assembly?

The torque capacity range is 150–1200 N·m, but this is a general reference. The required capacity must exceed the engine's peak torque with a safety margin, so verify the specific value for your application with the manufacturer.

What are the common materials used in clutch friction discs?

Friction materials can be organic, ceramic, or metallic. The choice affects the coefficient of friction and wear characteristics. The facing coefficient of friction is typically 0.35–0.45, but confirm the material grade and performance with the supplier.

How do I know if my clutch disc needs replacement?

Signs include clutch slippage (engine revs without speed increase), shudder during engagement, or unusual noise. These may indicate worn friction material, excessive runout, or other issues. Check disc runout (≤0.15 mm) and operating temperature limits.

What standards apply to clutch assemblies?

Relevant standards include ISO 2685 for disc dimensions and runout, ISO 12214 for pedal effort, ASTM D1894 for friction coefficient, and DIN 5480 for spline size. These are verification references; ensure compliance with the legal manufacturer.

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pressure:	Up to 10 bar
temperature:	-40°C to 150°C
torque capacity:	50-500 Nm
engagement speed:	Up to 6000 RPM

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