Motorcycle the functioning framing conjuration gear trouble inquest

1 gear trembling sign origin

Of rotary motion of the bearings, speed gears and else mechanistic defect detecting the shaking process typically applied. By the time-domain sign feature parameters and spectrum psychoanalysis to decide the running posit. The bearings and gears mounted up on the same axis, just one measuring aim detecting, the trembling of the 2 superposed conjointly were gathered, and the organization of sign intervention. In order to apart detecting gear trembling, bearing trembling sign asks to be eliminated as much as possible.

The trembling of the bearing is a high up frequence trembling, normally numerous than 4000Hz.planetary gear reducer

While the wheel speeding inward 400r/min while, bearing trembling sign under 8000Hz, so the cut out frequence of the sign noticed bearing set at 8000Hz.

And the gear trembling reflected inward its meshing frequence, the meshing frequence accounted as comes:

Fm = frN

Where Fm meshing frequence; fr axis frequence; N is the amount of gear teeth.

The detecting of the machine roof wheel, wheel speeding at 400r/min of DF4B and cargo locomotive engine gear ratio is 6314 (the amount of dentition of the heavy gear 63, a motor shaft gear 14), so mesh frequences FM = (400/60) 63 = 420Hz; for DF8B the gear ratio is 7717, its mesh frequence Fm = (400/60) 77 = 513Hz.

Hence apart the gear examining, both the cut frequence to be admitted in the gear trembling, only besides to keep off the trembling of the bearing, allowing the observance mesh frequence multiplier 34 times the meshing frequence, the cut out frequence, choice, so collection the cut out frequence of the gear trembling sign 2000Hz, you are able to except the intervention of the bearing trembling.

2 gear defect case and diagnosing

2.1 extravagant wear on the tooth superficial or the gap is overlarge

The gear average trembling mesh frequence amplitude is little, such as. Gear after years usage of extravagant outwear of tooth superficial, resultant backlash is overlarge, operated extra affect to gain. Reflect the trembling sign is the meshing frequence harmonical amplitude gains, particularly high harmonical bounty gains larger. Sign acquisition, spectrum analysis, discovered mesh frequence height, can decide whether extravagant wear equated with convention.

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