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Failure analysis Because the E704 bearing speed on the 138 gear is up to 14000r/min, the bearing cage speed has reached 5576~5625r/min. For the ML15 rivet and the wavy cage of the 10th sheet steel, the working conditions are extremely demanding. And the maximum speed of the bearing is close to the limit speed of the bearing is 14516r/min, the strength of the rivet and cage material is low, and the rivet and the cage are easily broken at high speed. Depending on the position of the device, the bearing is on the top and the gear is on the bottom. When the rivet breaks, the cage falls down, just between the teeth that are rotating, causing the gear to fail. In the case of another Type III engine, it can be seen that another E704 bearing cage rivet on the 138 gear shaft that is far from the gear also breaks. The two halves are separated, half of the cage is intact, and the other half of the cage breaks at the rivet holes of the lintel. Since the gear end bearing is blocked, the separated cage fails to enter the tooth. It can be judged that the bearing cage separation is caused by the rivet breaking. The gear failure process can be described as: high-speed rotation of the bearing rivet breaks ※ The cage is detached from the cage and enters the teeth to crush the teeth ※ Gear failure.
Analysis of failure causes of a type of engine centrifugal ventilator transmission gear. Conclusion a. The failure of the centrifugal gear of the pumping unit reducer centrifugal drive is independent of the gear quality and lubrication. b. Centrifugal ventilator drive The failure of the bevel gear is caused by entering the foreign object. c. The failure of the E704 bearing cage is due to the rupture of the rivet of the bearing cage under high-speed rotation, causing the two halves to separate and fall off. The detached cage enters the rotating gear and crushes the teeth, causing the gear to fail. Improvement measures a. On the three types of engine accessory transmissions, centrifugal fan driven bevel gear shafts, the E704 bearing wave cage is replaced by the E704Q bearing of the solid structure bronze cage. The dimensions of the two bearings, the diameter and number of the balls are all the same, only changing the structure and material of the cage, and does not affect the assembly and use. b. It is recommended that the bearings on the gear shafts of the engine accessories in other similar structures should be selected for the high speed limit and the strength of the cage material. The structure is the bearing of the solid cage to improve the work of the bearings in the transmission mechanism. reliability.