Abnormal noise from gearbox
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This post was last edited by yxmqh on 2010-3-18 at 13:38. The circulating gas compressor in our facility is driven by an electric motor; the gearbox is used to increase the speed of the motor, which in turn drives the compressor. During testing, from the moment the unit started up until it stopped, there was continuous abnormal noise coming from the gearbox. The noise was intermittent and sounded like a problem with gear engagement. The vibration and temperature levels of the unit were normal. Experts, what possible problems could there be with the gearbox?
When servicing the gearbox, it is necessary to ensure the following technical parameters: the meshing clearance of the gear teeth, the contact area, and the axial offset between the high-speed and low-speed gear teeth. Does the original owner’s transmission use bushings or bearings?
What was said upstairs is correct; when the driven wheel and the driving wheel engage, it is essential to ensure an appropriate meshing clearance first. The machine makes noise when it is in operation, and it should be inspected: 1. The condition of gear meshing – whether there are any defects such as wear, bonding, pitting, or flaking on the large and small gears ； 2. Check whether the gear meshing line is skewed or the meshing is poor, etc. A precision dummy shaft is also used to check the parallelism of the two gears, ensuring that the parallelism deviation remains within 0.025 MM, while the maximum allowable deviation in center distance should not exceed 0.10 MM. 3. Check the alignment of the centers on both sides of the motor and the compressor.
If there is meshing in the gearbox, then vibration should be reflected, right?
In the case of meshing problems, vibrations and temperature will both be reflected, right? Is there any pattern in the intermittent sound? If there is no regular pattern, the oil leakage might not be thorough. Personally, I infer that if the moderators think there is a problem, please don’t be offended, and don’t doubt my professionalism.
This post was last edited by wenlky2008 on 2010-3-10 at 17:46. The gearbox features a bushing structure with thrust bearings; during testing, the temperatures of these bearings were normal. However, according to the data from the online monitoring system, the trajectory of the axis was very chaotic and irregular. I’ve already taken a screenshot of the image, but I can’t upload it!
According to what you described, there should be no problems; domestic reducers are all like that. Low gear meshing precision, low viscosity of the lubricating oil, improper bearings, large radial and axial runout – all of these, along with collisions from auxiliary devices such as oil slinger rings, can cause the problems you’re describing. Run it for a while, change the oil, and then see
Some abnormal conditions can also be identified by checking the lubricating oil.
Are there any signs of pitting or increased clearance in the bearings?