Clutch system function introduction

The function of the clutch system is to ensure a smooth and reliable engagement of the engine with the drive train and to allow temporary and complete separation. Joining refers to the generation of friction torque, separation refers to the lifting of friction torque. Clutch work frequently, when driving in the car, due to the role of sliding friction of various parts easy to wear, deformation or rupture, the corresponding reduction in friction torque, resulting in clutch system failure. In order to extend the service life of the clutch as much as possible, it is quite important how to properly maintain the clutch system.

Clutch in use, the main problems are often heavy clutch pedal, skidding, separation is not complete (hanging file difficult), trembling, break, abnormal sound and so on. 1, clutch pedal heavy fault phenomenon, reason, test method and maintenance Fault phenomenon: foot clutch pedal heavy, easy to fatigue foot relative to the same other vehicle clutch pedal force have significant differences. Failure reasons: (1) Into: Improper adjustment, the pedal is too high, and no free travel (2) Driven disc (friction plate) Assembly: friction plate wear (wear to friction rivets Department) (3) (4) flywheel face, pressure plate face wear large (wear more than 0.5mm). (5) separation refers to excessive wear (finger arc has been polished), separation Bearing excessive wear (thrust plane grinding concave arc).

Maintenance methods:

The first step: check whether the clutch pedal is too high, air travel is appropriate, adjusted to normal. If the symptoms do not eliminate the next step.

The second step: Check the clutch pedal, master cylinder, sub-pump, separate fork, separate bearings and other cards involved, the phenomenon of movement is not flexible, whether the clutch pedal back to normal. Exclusion can not be resolved after the next step.

The third step: Check the clutch plate assembly, cover assembly, flywheel is excessive wear, pressure plate separation refers to the separation of the bearing thrust plane is worn excessive. Disk assembly friction plate wear should not leak rivets; measured with a vernier caliper, cover assembly Of the pressure plate working surface wear should not be greater than 0.3mm; flywheel installation depth with a depth gauge measurement, the depth of wear should not exceed 0.5mm above; pressure plate finger arcuate surface separation should not be polished; Grind out concave arc; does not meet the size should be replaced. However, during the repair process should pay attention to a part of the non-compliance should be replaced separately, do not replace the general set (for example: clutch disc assembly wear too much, only for the disc assembly, do not also replace the cover assembly) 2, slip phenomenon, reason, test methods and maintenance of the fault phenomenon: start a serious tremor, the car does not go on speed, slow acceleration, weakness, fuel consumption, etc., mainly due to smaller clutch torque, serious can not Torque transmission. Fault reasons: 1) Clutch sub-pump no free travel, when the clutch is slightly worn, the top of the separation mechanism separation means that the clutch does not return to the space that the pressure reduction of the clamping force, resulting in clutch slippery, severe wear and tear. 2) Driving operation problem: The clutch pedal is not completely released, the semi-clutch state is used excessively, the overloaded operation is performed and the steep slope is climbed so that the clutch is worn seriously. Slipping test method: hand brake to make the car in a fully braking state, step on the clutch pedal, and then start in a gear, and then release the clutch pedal, if the engine can stop, indicating no fault clutch. On the contrary, there is a clutch slippery, to be disassembled, check the clutch. Clutch slippage, can find the reasons from the following aspects: 1) driven plate (steel) assembly: viscous friction plate, friction plate carbonization, burning, friction plate damage, friction plate wear to rivets Department. 2) cover (platen) assembly: diaphragm spring breakage, the pressure plate working face wear larger than 0.3mm, deformation, mounting screw loose, separation finger jump more than 1mm. 3) Flywheel: flywheel face wear more than 0.5mm. 4) Separation mechanism: no shifting margin for the shift fork, no free stroke on the clutch pedal and no movement allowance for the separation bearing. 5) Braking system: Brake system is improperly adjusted, too tight, and the rear hub is hot after being repaired. Maintenance method: According to the above five reasons, skid can be repaired referring to the following sequence: Step 1: Confirm that there is no clutch slip Of the case, the driving process should pay attention to the driving method.Second step: In the slippery test method to confirm a clutch slippage, first check the clutch pedal with or without free travel, travel to meet the requirements of the vehicle manufacturer's maintenance manual;

Check the clutch release fork with or without free travel (7 ~ 8mm) .If not meet the requirements should be adjusted to the required range, if still can not rule out the fault to the next step .Third step: check and adjust the brake system, if still can not rule out the fault The next step: The fourth step: remove the transmission, check the separation of bearings, split the fork there is no card-related phenomenon, if there is a need to replace the same time check whether the phenomenon of clogging oil clutch, if necessary to confirm the oil source, and repair. Remove the clutch, check the disk assembly, cover assembly, flywheel wear is excessive, if the wear should be replaced. Check the friction plate for burning phenomenon, if the minor burn can be used coarse sandpaper grinding continue to use, if the burn is serious replace. 3, poor separation (hanging file difficult) failure phenomenon, reason, inspection methods and maintenance Fault phenomenon: clutch separation bad, resulting in hanging file difficult, serious only by engine stop to hang file .Testing inspection method: the clutch In the event of poor separation can be confirmed by the following methods to separate points, joints:

1) Set the engine to idle speed. (Transmission in neutral)

2) Pull the handbrake safely and depress the foot brake.

3) Slowly move the shift lever to the reverse gear without engaging the clutch pedal (clutch engaged state), and stop the operation of the shift lever when hearing the sound of the gear, keeping the sound of the gear squeal.

4) While keeping the gear ringing, slowly depress the clutch pedal and look for the position where the gear's chirp disappears. The position where the gear's chirping disappears is called the "separation point".

5) Depress the clutch pedal in this state to completely disengage the clutch, keep the shift lever still, slowly release the clutch pedal and hear the sound of the gear again. This position is called "joint point". If the separation point and the engagement point can not be found without the normal separation mechanism, it is determined that the clutch is not properly separated.