Grease is widely used in bearings, motors and some gears. If the grease is added, the lubrication is not enough. It seems that everyone understands, and this has caused a misunderstanding: add more, add more. In fact, it is not good to add more grease. Let's discuss together how much grease should be added? What's the harm in adding more?
Too much grease has the following hazards: the temperature rises during operation, which causes sealing problems, increases energy consumption, and is not good for the grease itself. For example, adding more grease to the motor will lead to increased power consumption and, in serious cases, the motor will malfunction.
Take the bearing as an example. Excessive grease is violently stirred in the bearing cavity, which increases bearing rotation resistance, and increases temperature and energy consumption. The increase in temperature will also cause the grease to oxidize faster (premature deterioration and shortened service life). The increase in temperature causes accelerated precipitation of the base oil contained in the grease-and the grease can play a lubricating effect, mainly because of the oil contained in it. After the base oil is lost from the grease, the thickening agent is left, which will dry and harden, causing the newly added grease to not fully flow to the bearing core, resulting in poor lubrication, bearing wear and even failure. In addition, hard blocks of dry grease may fall off, break and then be carried into the bearing.
Too much grease can also cause sealing problems. The pressure on the seals will increase, causing the seal to rupture and fail, resulting in a weak seal, introducing impurities and permeation, and causing damage to the bearing. Pay attention to the pressure of the seal when using grease guns for grease. Some grease guns can reach a pressure of 15,000 psi, while general lip seals can withstand about 500 psi. Therefore, the pressure of the grease gun should be reasonably controlled when greased.
For motors, the harmful effects of extra grease are similar to those of bearings, but there is also a possible consequence of excessive grease leaking to the motor windings and drying on the surface, causing poor heat dissipation in the windings.
How to prevent excessive grease?
First, determine the reasonable amount of grease. In addition, work out the operating specifications for the amount of grease to be added. After adding or replacing grease, pay attention to temperature, noise, vibration, etc., and pay attention to whether there is oil leakage. For important equipment, you can also use some special monitoring tools.
How to prevent excessive grease addition?
1. In addition to knowing the amount of grease added, certain methods can also help prevent excessive grease.
2. When adding fat, if you feel the addition is difficult, the addition is blocked, or you start to feel a large reaction force, you should stop adding the fat.
3. When adding grease, the oil outlet of the grease should be kept unobstructed to prevent the dry grease from blocking the holes.
4. If necessary, some small accessories can also have a very convenient effect, such as grease gun pressure gauge, grease nipple with pressure relief function and so on.
5. Adding grease slowly, too fast and too fast can easily cause sealing problems, and it is also not conducive to the uniform distribution of grease in the bearing.
