What specific impact does the oil level of BWEY131-289-1.5KW cycloidal pinwheel reducer have if the oil level is too high or too low on the noise level of the reducer?

Abnormal oil level will directly change the fluid dynamics state inside the reducer: if the oil level is too high, it will produce a high-frequency 'buzzing' sound accompanied by a temperature rise due to violent stirring of the oil. If the oil level is too low, it will cause lubrication failure at the gear mesh, causing a dull 'clicking' sound or sharp friction sound, both of which will make the noise level significantly exceed the normal range.

1. The oil level is too low (below the center line of the oil mirror or the lower limit of the oil mark)

The core problem of low oil level is lubrication failure and dry friction, which will cause high-frequency, sharp and unstable noise.

1. Types and characteristics of noise

(1) High-frequency sharp whistling/squeaking sound (above 5000Hz): Because a complete oil film cannot be formed between the cycloidal wheel and the pin teeth, the bearing rolling element and the raceway, boundary friction or dry friction occurs, resulting in high-frequency squealing.

(2) Metal impact/clicking sound: The buffering effect of the oil film is lost, direct metal impact occurs at the meshing gap, and the sound is a periodic, intermittent crisp knocking sound.

(3) The overall noise decibel surges: the noise is about 70-75dB (A) under normal working conditions. When the oil level is too low, it usually increases by 8-15dB (A), and the sound is rough and harsh.

(4) Vibration intensifies synchronously: friction and impact cause the body to vibrate, and the vibration amplifies the noise, forming a vicious cycle of 'vibration-noise'.

2. Specific impact on BWEY131 model

This model has a double-stage cycloidal pinwheel structure (BWEY structure), which contains a high-speed eccentric bearing, a cycloidal wheel, a pin gear shell, and a low-speed stage output mechanism. When the oil level is too low:

(1) The high-speed eccentric bearing is the first to run out of oil, making a continuous 'buzzing' sound, and the temperature rises rapidly.

(2) The meshing area between the cycloidal wheel and the pin teeth is insufficiently lubricated, causing periodic meshing impact noise.

(3) The output shaft pin and sleeve have friction and abnormal noise due to poor lubrication.

The noise continues to worsen as the running time increases, along with the increase in oil temperature and power loss.

2. The oil level is too high (higher than 2/3 of the oil gauge or the upper limit of the oil level)

The core problem of excessively high oil level is violent oil churning and fluid resistance, resulting in low-frequency, dull fluid noise and bubble impact noise.

1. Noise types and characteristics

(1) Squeaking/boiling sound of violent oil stirring: The rotating parts (eccentric sleeve, cycloid wheel) are deeply immersed in the oil, and the lubricating oil is stirred at high speed, producing a continuous and low churning sound of the fluid.

(2) The crackling sound of bubble bursting: Vigorous stirring causes the oil to mix with a large amount of air, forming foam; the bubble bursts at the meshing surface and bearing, producing a high-frequency, fine popping sound.

(3) Dull low-frequency roar: The oil stirring resistance increases, and the load of the motor and reducer fluctuates, causing low-frequency resonance of the body, making the sound low and 'stuffy'.

(4) Overall noise increase: The decibel value increases by 5-10dB(A), and the sound changes from a uniform 'buzzing sound' to a noisy sound mixed with fluid sound and bubble sound.

2. Specific impact on BWEY131 model

This model has limited box space and compact internal structure (double-level nesting). When the oil level is too high:

(1) The eccentric sleeve and the cycloidal wheel are completely submerged, the oil stirring resistance is much greater than that of a single-stage reducer, and the noise and power consumption increase simultaneously.

(2) The upper part of the needle gear housing and the output bearing are wrapped in oil, which results in poor heat dissipation and an increase in oil temperature, further aggravating oil oxidation and noise deterioration.

(3) The risk of leakage at the oil seal increases, accompanied by a slight 'hissing' sound of oil leakage.