How to choose oil according to the Dn value of the rolling bearing

The recommended oil viscosity according to dn value / temperature is as follows:

Dn value <10000mm.r/min, oil viscosity 60mm2/s for bearing working temperature 0-30°C, suitable oil 37.8°C viscosity 115mm2/s at 30-60°C, suitable viscosity 37.8°C at 60-90°C 360mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 750mm2 / s;

The dn value is 10000-25000mm.r/min, the oil viscosity is 35mm2/s when the bearing working temperature is 0-30°C, the applicable oil is 37.8°C viscosity 95mm2/s at 30-60°C, and the applicable oil is 37.8°C at 60-90°C. Viscosity 270mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 550mm2 / s;

The dn value is 25000-60000mm.r/min, the oil viscosity is 35mm2/s when the bearing working temperature is 0-30°C, the applicable oil is 37.8°C viscosity 70mm2/s at 30-60°C, and the applicable oil is 37.8°C at 60-90°C. Viscosity 270mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 550mm2 / s;

Dn value is 60000-75000mm.r/min, oil viscosity is 20mm2/s when bearing working temperature is 0-30°C, suitable viscosity is 37.8°C 60mm2/s at 30-60°C, and suitable oil is 37.8°C at 60-90°C Viscosity 220mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 360mm2 / s;

Dn value is 75000-100000mm.r/min, oil viscosity is 20mm2/s when bearing working temperature is 0-30°C, viscosity is 60wt2/s at 30-60°C, viscosity is 60mm2/s at 60-90°C, and suitable oil is 37.8°C at 60-90°C Viscosity 160mm2 / s, suitable oil at 30-120 ° C 37.8 ° C viscosity 3600mm2 / s;

Dn value 100000-250000mm.r/min, oil viscosity 9mm2/s for bearing working temperature 0-30°C, 37.8°C viscosity 35mm2/s for 30-60°C, 37.8°C for oil at 60-90°C Viscosity 115mm2 / s, suitable oil at 90-120 ° C 37.8 ° C viscosity 270mm2 / s;

Dn value is more than 250,000 mm.r/min, oil viscosity is 9mm2/s when the bearing working temperature is 0-30°C, 37.8°C viscosity is 35mm2/s at 30-60°C, and suitable oil is 37.8°C at 60-90°C. The viscosity is 95 mm 2 /s, and the applicable oil at 90-120 ° C is 37.8 ° C viscosity 270 mm 2 / s.

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Calculation method of rolling bearing fault frequency

Rolling bearing outer ring fault frequency: BPFOr≌0.4Nn
Rolling bearing inner ring fault frequency: BPFIr≌0.6Nn
Rolling bearing cage failure frequency: FTFr≌0.4N

The above symbols:

n = number of rolling elements.
N = speed of the shaft.

Note: 1. The rolling bearing does not slide; 2. The rolling bearing geometry does not change; 3. The bearing outer ring is fixed and does not rotate.

Rolling bearing outer ring fault frequency: BPFOe≌N (0.5n-1.2)
Rolling bearing inner ring fault frequency: BPFIe≌N (0.5n+1.2)
Rolling bearing rolling element failure frequency: BSFe≌N (0.2n-1.2/n)
Rolling bearing cage failure frequency: FTFe≌N (0.5-1.2/n)

The above symbols:

n = number of rolling elements.
N = speed of the shaft.

Note: 1. The rolling bearing does not slide; 2. The rolling bearing geometry does not change; 3. The bearing outer ring is fixed and does not rotate.

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Regular lubrication maintenance of running bearings

Core Tips: 1. Grease Lubrication Relubrication of bearings is best carried out during planned equipment downtime and is periodically replenished. At the same time, the old grease is removed or the old oil is drained through the drain.
1, grease lubrication
Relubrication of the bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.
2, lubricating oil lubrication
Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.
Check and replenish the oil method, take a small amount of lubricating oil as a sample and compare it with fresh oil. The competent unit can consider the oil quality test to ensure the oil quality is qualified. If the sample looks cloudy, it may be the result of mixing with water, which is commonly referred to as oil emulsification. At this point, the lubricant should be replaced.
If the sample is darkened or thickened, it may indicate that the lubricant has begun to carbonize and the old lubricant should be completely replaced. If possible, flush the oil line with fresh oil. When changing the lubricating oil, make sure that the new and old models of the replaced oil are the same and supplement the required oil level.
Use an oil bath type lubrication system. If the oil temperature is below 60 ° C (140 ° F) and the lubricant is not contaminated, replace the lubricant once a year. If the oil temperature is between 60-100 ° C (140-210 ° F), the lubricant needs to be replaced four times a year. If the oil temperature is between 100 and 120 ° C (210-250 ° F), the lubricant needs to be replaced once a month. If the oil temperature is above 120 ° C (250 ° F), the lubricant needs to be replaced once a week.
Proper installation and maintenance are important factors in the normal operation of the bearing. At the same time, care must be taken to maintain the cleanliness of the bearing. Bearings must be protected from contaminants and moisture and must be properly installed and lubricated. In addition, the design of the bearing arrangement, the condition of the oil seal, the form of the lubricant and the replacement cycle and the special maintenance also play an important role and must be paid attention to.

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Troubleshooting FAG bearing clutch failure method

Core Tip: Move the split fork under the car so that the front end of the split FAG bearing gently rests on the inner end of the split lever and rotate the clutch for one week. If the inner end of the separation lever cannot be simultaneously
Move the split fork under the car so that the front end of the split FAG bearing gently rests on the inner end surface of the split lever, and rotate the clutch for one week to view. If the inner end of the separating lever cannot be in contact with the separated FAG bearing at the same time, the height of the separating lever is inconsistent and should be adjusted. If the separation levers are of the same height and are still not completely separated, check the lever height and adjust the separation levers to the same height.

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