Support from the body with a lift, four-wheel off the ground simulation test, feeling the sound from the site of the transaxle differential outgoing, similar to bearing wear noise emitted. Lift and decompose under the transmission and remove the differential assembly, check the bearing and race found no scratches and spots. Toggle pinion shaft by hand, you could feel the amount of radial movement of about 0.10mm, while the two side gears, there are nearly axial movement of 1.0mm. But through the planetary gear engagement surface between its point of view, with the gap but it is excellent. After a comprehensive analysis, that the differential assembly is good. Hand rotation bearings, there are "imperfections" friction sound, decided to replace. And later checked the clutch, clutch plate, within two axle, outside the Cage, were not found anomalies.
If only isolated bearing wear, the noise emitted by it should appear in the clutch pedal stage, it is impossible to produce when the throttle is in motion, indicating that did not find a real point of failure. At this point if refitted transmission, its result will have to repair, so he carefully reviewed again. Perhaps intuitive factor, I picked up the clutch plate inspection, according to rivet currently wear depth, indeed can continue to use, but a closer look and found a small strip of bright printed between the driven plate against the driven plate steel drum, Hold the friction linings other hand to rotate the driven hub, found to have serious Songkuang.
Follower plate steel and driven hub by elastic damping spring coupled together, the hub is sandwiched between steel sheet and the damping plate, and in which there are the friction plates. And damping steel plate with riveted middle set aside a certain distance, so that the hub can be rotated slightly relative. Entire clutch plate from torque. When that is the torque is transmitted through friction linings first steel sheet and the damping plate, and then transmitted to the hub by spring, when the spring is compressed, in order to absorb the impact on, and use of steel and damping between the plates, the friction between the hub and the friction plate to torque vibration energy consumption, the rapid decay of the vibration.
Because the engine reached the car driveline torque is changing periodically, which makes the driveline torque is generated vibration, if the frequency and drivetrain natural frequencies coincide, that lead to resonance. Combined damping spring not only slow the impact load, can reduce the natural frequency to avoid resonance. While the vehicle damping spring due to frequent operation of the clutch, the high temperature annealing shortened lose elasticity connection with damping effect. Close slick line, torque is transmitted by the wheels via the drive train engine, between the engine brake, steel and driven disc hub due to the force of change, reversing an opposite point of view, giving rise to the fight against the phenomenon, but also because periodic torque variation will have a similar bearing wear "slightly luo la la," sound.
