Release Bearing for Motor Vehicle Clutch Systems

Product Specifications

Technical details and manufacturing context for Release Bearing

Definition

The release bearing is a critical component within the clutch assembly that facilitates the disengagement of the clutch. It is mounted on the clutch fork and, when actuated, presses against the diaphragm spring or release levers of the pressure plate. This action moves the pressure plate away from the clutch disc (friction disc), interrupting the power transmission from the engine to the transmission, allowing for gear changes. The release bearing is a thrust bearing that transmits axial force while accommodating the relative rotation between the stationary fork and the rotating pressure plate. It is typically made of high-carbon chromium steel (e.g., GCr15) with a polyamide cage and is pre-lubricated with synthetic grease. The bearing's bore diameter ranges from 25 to 120 mm, outer diameter from 50 to 200 mm, and width from 15 to 60 mm, matching common clutch shaft sizes and housing fits. Dynamic load ratings range from 10 to 100 kN, static load ratings from 15 to 150 kN, and maximum speeds from 3000 to 10000 rpm, depending on lubrication. Operating temperatures range from -40°C to 150°C, with radial clearance between 0.010 and 0.060 mm. Axial displacement during clutch travel is typically 5 to 15 mm. Sealing type is often 2RS (contact seal) per ISO 6194. The material grade is GCr15 per GB/T 18254. Weight ranges from 0.5 to 5.0 kg. These values are reference ranges; actual specifications must be verified with the manufacturer for the specific vehicle application. The release bearing is essential for smooth gear shifting and clutch operation, and its proper functioning is critical for vehicle drivability.

Working Principle

The release bearing is a thrust bearing. When the clutch pedal is depressed, hydraulic or cable force moves the clutch fork, which pushes the release bearing forward against the rotating pressure plate assembly. The bearing's inner race rotates with the pressure plate while its outer race is pushed by the stationary fork, allowing it to apply axial force to disengage the clutch with minimal friction. This axial force moves the pressure plate away from the friction disc, interrupting power flow. The bearing's design accommodates the relative motion between the stationary fork and the rotating pressure plate, ensuring smooth operation and reduced wear.

Common Materials

High-carbon chromium steel (e.g., GCr15), Polyamide (for cage/retainer), Synthetic grease

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	25–120 mm	Matches clutch shaft sizeISO 15
Outer Diameter	50–200 mm	Housing fitISO 15
Width	15–60 mm	Space constraintISO 15
Dynamic Load Rating	10–100 kN	Higher for heavy-dutyISO 76
Static Load Rating	15–150 kN	Peak load capacityISO 76
Max Speed	3000–10000 rpm	Depends on lubricationISO 15312
Operating Temperature	-40–150 °C	Grease degradation aboveISO 492
Radial Clearance	0.010–0.060 mm	Affects noise and lifeISO 5753-1
Axial Displacement	5–15 mm	Clutch travel
Sealing Type	2RS	2RS = contact sealISO 6194
Material Grade	GCr15	Bearing steelGB/T 18254
Weight	0.5–5.0 kg	Affects handling

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

Inner Race Part
The rotating ring that contacts the pressure plate's release fingers or diaphragm spring. It is often integrated with a contact surface or collar.

Material: Hardened high-carbon chromium steel
Outer Race Part
The stationary ring that is pressed by the clutch fork. It houses the rolling elements.

Material: Hardened high-carbon chromium steel
Rolling Elements (Balls) Part
Reduce friction between the inner and outer races, allowing the inner race to rotate while axial force is applied.

Material: Hardened high-carbon chromium steel
Cage/Retainer Part
Maintains even spacing and prevents contact between the rolling elements.

Material: Steel stamping or polyamide (plastic)
Seal Part
Retains lubricating grease and excludes contaminants like dirt and moisture.

Material: Synthetic rubber (e.g., NBR)

Applied To / Applications

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

Clutch Assembly

View system integration details

Manufacturers of Release Bearing

Manufacturer profiles associated with Release Bearing.

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Frequently Asked Questions

What is the function of a release bearing?

The release bearing disengages the clutch by moving the pressure plate away from the friction disc, interrupting power transmission from the engine to the transmission, allowing gear changes.

What materials are commonly used for release bearings?

Common materials include high-carbon chromium steel (e.g., GCr15) for the bearing races, polyamide for the cage, and synthetic grease for lubrication.

What are typical bore diameter ranges for release bearings?

Typical bore diameters range from 25 to 120 mm, matching clutch shaft sizes. Always verify the exact size for your application.

How should I verify the correct release bearing for my vehicle?

Check the vehicle manufacturer's specifications for bore diameter, outer diameter, width, load ratings, and other parameters. Confirm with the supplier that the bearing meets the required standards.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 MPa (100 bar)
other spec:	Axial load capacity: 2-15 kN, Speed: Up to 6000 rpm
temperature:	-40°C to 150°C

Release Bearing

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards