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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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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How to maintain the water pump bearing

(1) The pump that is newly put into use must be replaced with grease (oil) after 100 hours of operation, and then replaced once every 500 hours.

     (2) Lubricating grease-lubricated flow bearings should be replaced after 1500 hours of operation. The amount of oil to be filled should not be too much or too little, because too much or too little grease will cause the bearing to heat up. It is preferably 1/2 to 2/3 of the volume of the bearing chamber.

     (3) For bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.

     (4) The container containing lubricating oil or grease should be clean and should be sealed properly. There should be no dust, iron filings and other debris to avoid damage to the bearing.

     (5) Motor bearings generally use sodium-based grease, which is characterized by high temperature resistance (125 ° C), but is easily soluble in water, so it can not be used for lubrication of water pump bearings.

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Inspection, maintenance and maintenance of wheel bearings

Hub bearings are important moving parts for automobiles. The hub axle bears the burden of reducing the frictional resistance during the operation of the chassis and maintaining the normal driving of the car. If the hub bearing fails, it may cause noise, bearing heat, etc., especially the front wheel is more obvious, which may lead to dangerous phenomena such as out of control. Therefore, the hub bearings must be maintained on schedule.

1. Inspection of the hub bearing

(1) When checking the tightness of the hub bearing, firstly, the axle of the wheel at one end of the wheel of the car to be inspected is erected, and the vehicle is safely framed by means of a vehicle stool, a wooden cover, and the like.

(2) Turn the number of wheels to be inspected by hand to see if the rotation is stable and there is abnormal noise. If the rotation is not smooth and there is friction, the brake part is not normal; if there is no noise, the rotation is not smooth and it is loose when it is tight, indicating that the bearing part is not normal. The hub should be removed when the above abnormality occurs. For small cars, when inspecting the hub bearings, hold the upper and lower sides of the tires with both hands, and pull the tires back and forth with both hands and repeat them many times. If it is normal, there should be no feeling of looseness and blockage; if the swing has a feeling of looseness, the wheel should be removed.

(3) Inspection of the brakes. Usually when inspecting the hub bearing, check the wheel brake device. If there is oil on the inside of the tire, it may be caused by oil leakage from the brake cylinder or brake hose. The cause should be identified and eliminated.

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