Hydraulic Throwout Bearing

I. Hydraulic Throwout Bearing Definition and Function

The Hydraulic Throwout Bearing, or clutch hydraulic release bearing, is a key component in the clutch system, especially in manual transmissions. It is located between the clutch pressure plate and the clutch pedal, and transmits the force generated when the driver depresses the clutch pedal through hydraulic action, thus separating the clutch pressure plate from the clutch disc and achieving power interruption. The hydraulic throwout bearing is designed to provide smooth, low-noise clutch operation and extend clutch life.

II. Principle of operation of hydraulic throwout bearing

The hydraulic throwout bearing contains a hydraulic cylinder, piston, seals and other components. When the driver depresses the clutch pedal, the pedal pushes the piston in the hydraulic cylinder forward through the linkage mechanism. This movement compresses the hydraulic fluid inside the cylinder, generating hydraulic pressure. The hydraulic pressure is transmitted through a specific oil circuit to the inside of the bearing, which pushes the piston or similar mechanism inside the bearing, which in turn disengages the clutch pressure plate from the clutch disc. When the clutch pedal is released, the hydraulic pressure decreases and a reset mechanism (such as a spring) inside the bearing re-engages the clutch.

Causes of non-disengagement of the hydraulic throwout bearing

When the hydraulic throwout bearing does not disengage (i.e., the clutch cannot be disengaged), the possible causes include:

1. Hydraulic system failure: such as hydraulic oil leakage, hydraulic cylinder damage, there is air or seal failure, resulting in hydraulic pressure can not be transmitted or insufficient transmission, can not push the bearing to disengage.

2. Mechanical failure: such as the internal mechanism of the bearing is stuck, the linkage mechanism is broken or loose connection, etc., resulting in the force can not be effectively transmitted.

3. Improper operation: such as the driver half-pressing the clutch pedal for a long time, resulting in overheating or increased wear of the clutch, which in turn affects the disengagement effect.

4. Worn clutch disc: If the clutch disc is badly worn, even if the clutch pressure plate is separated from the clutch disc, the power transmission may not be completely interrupted due to excessive friction.

5. Damage to the hydraulic cylinder: Internal wear or damage may cause the hydraulic cylinder to fail to operate properly.

6. Improperly Adjusted Clutch Pedal Stroke: Incorrectly set pedal stroke may prevent the hydraulic system from reaching sufficient pressure to disengage the bearing.

7. Plugging or contamination: Impurities in the hydraulic system may clog the oil lines and affect pressure transfer.

8. Bearing seizure: After prolonged use, the bearings may become worn internally or jammed with foreign objects, preventing them from moving properly.

9. Bearing damage: long time use or improper operation may cause bearing wear or damage, making it unable to work normally.

10. Clutch pressure disc problem: If the clutch pressure disc is excessively worn or stuck, the bearing may not be able to disengage it.

Fourth, hydraulic throwout bearing maintenance

In order to keep the hydraulic throwout bearing in good working condition and prolong its service life, the following maintenance measures can be carried out:

1. Regularly check the hydraulic oil: ensure the cleanliness and adequacy of the hydraulic oil, and timely replacement of aged or contaminated hydraulic oil.

2. Check seals: Regularly check whether the seals of the hydraulic cylinder and bearings are intact, if damaged, they should be replaced in a timely manner.

3. Cleaning and lubrication: Clean the clutch pressure plate, clutch disc and bearing regularly to reduce wear and pollution. Keep the hydraulic throwout bearing and its surroundings clean and lubricate the related parts regularly to reduce wear and tear.

4. Correct operation: Drivers should operate the clutch pedal correctly and avoid half-pressing the clutch pedal for a long time or pressing it frequently.

5. Regular inspection of the clutch disc: check the wear of the clutch disc regularly, and replace it in time if it is badly worn.

6. System check: During the vehicle's major maintenance, check the hydraulic throw-out bearing for wear or damage, and replace it promptly if necessary.

7. Pedal Stroke Adjustment: Adjust the pedal stroke according to the vehicle manufacturer's instructions to ensure correct operating pressure.

8. Professional Inspection: When problems are encountered, the clutch system, including the wear of the hydraulic throwout bearing, should be inspected by a professional technician.

9. Avoid Air Entry into the System: When servicing the hydraulic system, operate with care to prevent air from entering the oil circuit.

10. Operating precautions: Avoid pressing the clutch pedal quickly and frequently to reduce unnecessary wear.

Summarising

The hydraulic throwout bearing is a high-tech component in the clutch system of modern automobiles, which achieves smooth clutch disengagement through hydraulic force, and its working condition directly affects the clutch disengagement effect and vehicle performance. When non-disengagement problems are encountered, they are usually related to hydraulic system failure, mechanical wear or improper adjustment. Maintenance focuses on keeping the hydraulic system clean and intact, as well as timely professional inspections to ensure that the clutch system works efficiently and reliably. Proper maintenance will extend its service life and avoid unnecessary trouble during driving. In the event of non-disengagement, it should be checked and repaired immediately to avoid greater damage and higher repair costs.