What factors are related to the vibration frequency of ZDY315-4.5-I gear reducer

ZDY315-4.5-I is a single-stage hard tooth surface cylindrical gear reducer, and its vibration frequency core is directly related to input speed, transmission parameters, and structural component status. At the same time, it is affected by external factors such as installation and working conditions. The points are clearly explained and adapted for practical operation reference:

1. Core transmission parameters (determining the fundamental characteristic frequency, which is the fundamental factor of vibration frequency)

One is the input speed, which directly determines the high-speed shaft rotation frequency. The formula f ₁=n ₁/60 (n ₁ is the input speed r/min), the higher the speed, the higher the high-speed shaft rotation frequency, and the synchronous increase of the meshing frequency, which is the benchmark for all vibration frequencies; The second is the transmission ratio (fixed at 4.5), which determines the low-speed shaft rotation frequency. The formula is f ₂=f ₁/4.5. If the transmission ratio is fixed, the ratio of high-speed to low-speed shaft rotation frequency remains constant and will not change with operating conditions; The third is the number of teeth on the gear, which determines the meshing frequency. The formula f ₘ=z ₁ × f ₁=z ₂ × f ₂ (z ₁/z ₂=4.5) is used. If the number of teeth is fixed, the meshing frequency is proportional to the input speed and is the dominant vibration frequency of gear transmission, with no room for variation.

2. Internal core component status (determining whether abnormal vibration frequency occurs and related fault determination)

One is the state of the gear pair. When the gears mesh normally, only the meshing frequency is stable. If the tooth surface is corroded, peeled off, or worn, sidebands will appear on both sides of the meshing frequency; If there is a broken tooth or a broken tooth surface angle, there will be a significant peak in the superposition of rotational frequency and meshing frequency; If the meshing gap is too large, it will cause unstable meshing frequency, accompanied by low-frequency fluctuations; The second is the bearing status. If the bearing model is fixed, it corresponds to a fixed characteristic frequency (including inner ring, outer ring, roller, and cage frequencies). When the bearing has no faults, this frequency has no obvious peak. If the raceway is worn, the roller is deformed, or the cage is damaged, the characteristic frequency of the bearing will be highlighted, accompanied by a doubling peak; The third is the shaft system state. When the high-speed shaft/low-speed shaft is not bent and the keyway is not worn, only the rotation frequency is stable. If the shaft is bent or the keyway is deformed, it will cause the peak value of the rotation frequency to increase by 2 times or 3 times, which will also affect the stability of the meshing frequency.

3. Installation accuracy (affecting vibration frequency amplitude and stability, easily causing abnormal frequency doubling)

One is coaxiality. If the motor is not aligned with the reducer, or the reducer is not aligned with the load coupling (radially or diagonally), it can lead to a significant increase in the second harmonic of the high and low speed shaft rotation frequency, and in severe cases, it can superimpose the meshing frequency, causing composite abnormal frequencies; The second issue is the fixation of the foundation. Loose foundation bolts and weak foundations can cause irregular fluctuations in vibration frequency, as well as irregular fluctuations in peak values of frequency conversion and doubling, which can amplify the amplitude of all vibration frequencies; The third issue is installation clearance. If the clearance between the bearing end cover is too large and the joint surface of the box is loose, it will generate additional low-frequency vibration and interfere with the basic characteristic frequency.