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Automotive Bearings - Clutch Release Bearings
A car's clutch release bearing is a key component of a car's transmission. It is installed between the clutch and transmission and, by coordinating the rotational and axial movements of the release levers, ensures smooth engagement and disengagement of the clutch, reduces wear and extends transmission life.
Description
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Product Description
A car's clutch release bearing is a key component of a car's transmission. It is installed between the clutch and transmission and, by coordinating the rotational and axial movements of the release levers, ensures smooth engagement and disengagement of the clutch, reduces wear and extends transmission life. Structurally, the bearing is freely seated on the bearing cap of the gearbox input shaft and, due to the return spring, maintains a gap with the ends of the release levers, which guarantees stable operation.
This bearing must meet the technical standards: axial clearance ≤ 0.60 mm, wear of the inner ring ≤ 0.30 mm. Malfunctions usually manifest themselves in the form of unusual noises or binding and are mainly caused by insufficient lubrication, frequent operation of the clutch half-depressed, or incorrect free play adjustment. Maintenance requires periodic lubrication with lithium grease, adjusting the evenness of the release levers and maintaining free play within 30-40 mm.
The bearing consists of an outer ring, an inner ring, rolling elements, a cage and contact surfaces. Chromium steel, stainless steel or special high-quality bearing steels are used. Modern designs often use angular contact ball bearings and raceways made of high chromium hardened steel. They have self-lubricating, low vibration and automatic self-aligning features. The internal design includes a triple lip seal and high temperature grease. The main function of the bearing is to control the separation or connection of the clutch pressure plate and the flywheel through axial movement, which switches power transmission between the engine and transmission, ensuring smooth traction of the vehicle and gear changes. Its self-aligning design provides smooth on/off control.
The clutch bearing is usually installed between the clutch and the transmission. In normal condition, a certain gap is maintained between it and the release levers (for example, 3–4 mm or about 2.5 mm) to reduce wear. When you press the pedal, the release fork pushes the bearing against the pressure plate, disengaging power transmission; When the pedal is released, the bearing is returned by a spring, restoring the clearance. Typical problems include abnormal noise, burning and premature wear, which are mainly caused by deterioration of the lubricant, improper free play adjustment or deformation of the release levers. Maintenance requires periodic (for example, every 300–500 hours of operation) replenishment of lubricant and avoidance of prolonged operation of the clutch in a half-pressed state. This component is widely used in passenger cars, commercial vehicles and engineering equipment and, according to operating conditions, is divided into ball and roller types.
The release bearing requires regular maintenance. After every 300–500 hours of operation, it should be removed, washed in diesel fuel, then placed in molten grease, heated to a liquid state, and kept until completely saturated; After cooling and hardening of the lubricant, the bearing is installed in place. It is also necessary to regularly clean and lubricate the screw bevels of the release cams and bearing caps, and add engine oil into the small oil holes on the release cams. After washing or replacing the clutch bearing, apply an appropriate amount of grease, and when installing, ensure that the side with the dust cover faces the clutch.
To avoid abnormal wear of the release bearing, the driver should avoid operating the clutch in a half-depressed state for a long time or keeping his foot on the clutch pedal for a long time while driving. The clutch pedal play should be regularly checked and adjusted to within 30-40mm to ensure proper clearance of approximately 2.5-4mm between the release bearing and the release levers.
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