Transmission shaft bolt loosening performance is bolt loosening, re tightening soon, there has been loose. The failure of the drive shaft bolt is caused by the following reasons:
(1) unbalanced transmission shaft. Transmission shaft imbalance of more than 100 g cm, resulting in the operation of the drive shaft jitter, due to jitter caused by the transmission shaft bolts loose. Because there is no fundamental problem, only for simple fastening, use not long time and appeared loose.
Baotou beiben heavy truck accessories balance shaft and the following aspects: transmission shaft radial runout is too large; because the parts size does not meet the accuracy requirements, resulting in forks positioning port too tight or too loose, so that the two flange axis in the installation is not easy to coincide; transmission shaft tube bending deformation, sag cardan shaft center line; both ends of the transmission shaft is not in the same plane, not uniform rotation.
(2) Baotou beiben heavy truck parts transmission shaft connections do not meet the requirements. The diameter of the flange on the flange does not match; the diameter of the flange bolt hole is too large; the use of unqualified transmission shaft bolts, these unqualified parts will make the gap is too large. When the engine speed changes, bolt shear stress caused by the swinging in the hole, bolt loosening phenomenon. In particular should not be allowed to use ordinary bolts.
Fault judgment and elimination
(1) use the jack to lift the rear wheel of the car to make it off the ground; start the engine to hang the low speed gear, if the drive shaft has obvious jitter phenomenon, namely the transmission shaft rotation is unbalanced. The drive shaft should be removed for balance check.
(2) if the Baotou beiben heavy truck parts transmission shaft without chattering phenomenon obviously, should focus on checking the connections, such as flange, flange fork, drive shaft bolts, for unqualified parts, determined not to prevent the occurrence of serious accidents of transmission shaft off.