6200 Series Bearing

The lubrication method of 6200 Series Bearing is divided into grease lubrication and oil lubrication. In order to make the 6200 Series Bearing function well, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the 6200 Series Bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. When lubricating, pay special attention to the amount. Whether it is oil lubrication or grease lubrication, too little amount will affect the life of the 6200 Series Bearing, and too much amount will cause great resistance and affect the rotation speed.

odel	Dimension			Basic Load Roting		Balls		Limiting Speed (r/min)		Weight (approx.)
	d	D	B	Cr	Cor	Qty	Dia.	Grease	Oil	g
	mm	mm	mm	N	N	PCS	mm	Grease	Oil	g
623	3	10	4	582	196	6	φ1.588	40000	48000	1.6
624	4	13	5	1355	480	7	φ2.381	40000	48000	3.2
625	5	16	5	1470	600	8	φ2.381	36000	43000	5.1
626	6	19	6	2590	1037	7	φ3.500	32000	40000	8.6
627	7	22	7	3300	1370	7	φ3.969	30000	36000	13.1
628	8	24	8	3350	1430	7	φ3.969	28000	34000	17.0
629	9	26	8	4557	1953	7	φ4.763	28000	34000	19.1
6200	10	30	9	5110	2380	8	φ4.763	24000	30000	32.0
6201	12	32	10	6808	3051	7	φ5.953	22000	28000	37.0
6202	15	35	11	7450	3700	8	φ5.953	20000	24000	45.0
6203	17	40	12	9560	4780	8	φ6.747	17000	20000	65.0
6204	20	47	14	12840	6553	8	φ7.938	15000	18000	106.0
6205	25	52	15	14020	7930	9	φ7.938	13000	15000	128.0
6206	30	62	16	19460	11310	9	φ9.525	11000	13000	199.0
6207	35	72	17	25670	15300	9	φ11.112	9500	11000	288.0
6208	40	80	18	29520	18140	9	φ12.000	8500	10000	366.0
6209	45	85	19	31663	20736	10	φ12.000	7500	9000	380.0
6210	50	90	20	35065	23225	10	φ12.700	7100	8500	450.0

FAQ

How to judge the ultimate temperature resistance of motor bearings

Recently, a customer asked “how high is the ultimate temperature resistance of general motor bearings”? In fact, this problem needs to be analyzed from four aspects, namely the bearing body, cage, seals and grease. Because of it is different temperature limits for the four components. Let us make up for you to briefly talk about it.

First, the body of bearings

Bearing body is bearing inner ring, outer ring and rolling body. These parts are usually made of bearing steel and need to go through the corresponding heat treatment in the production process of motor bearings. Because of its size and accuracy will be relatively stable for the motor bearing in this temperature range. However, the size and stability of bearing parts may change if higher than this temperature. And the internal metal structure of the bearing will also change at the same time, which leads to corresponding changes in the hardness of the bearing. But different manufacturers have certain differences in the default stable temperature of heat treatment for different types of motor bearings.It is recommended to consult corresponding manufacturers for detailed limits.

Second, the cages of bearings

The most commonly used cage materials for motor bearings are steel, copper (mainly brass) and nylon. Steel and brass material temperature limits do not need to be considered separately of the three materials, and can be almost equal to the temperature limits of the ring. The default temperature range for nylon cages is -30℃~120℃. It is necessary to change the motor bearing selection or other calculations to comprehensively consider its availability if the temperature is higher than this environment for a long time.

Third, the seals of bearings

Usually the seals of sealed bearings are more often used when there are no special requirements. The temperature range of seals made of this material is also between -30℃ and 120℃. Fluorine rubber seals can withstand temperature up to 180℃, but it is very expensive. (Please consult the corresponding manufacturer for the temperature limit of seals of other materials.)

Fourth, the grease

The viscosity of grease will be affected if the temperature of motor bearing rises. And it is necessary to carry out the corresponding check the grease after the viscosity change can meet the application condition. Generally, the temperature range of grease in sealed bearings is about -30℃~120℃. Technicians can choose to use low temperature grease, high temperature grease, wide temperature grease and so on according to working conditions.

HUCK Bearing is an enterprise focusing on the research and manufacture of ball bearings with high precision and low noise, and has rich experience in the production and sales of bearings. At present, our products are widely used in motor, automobile, household appliances, power tools, garden tools, fitness equipment, medical equipment, water pumps, mechanical equipment and other fields. We have been well received by many customers adhering to the business philosophy of “the real quality is more durable, so that the bearing rotation is quieter”. Welcome to inquiry and feel free let me know if you any interesting.

Causes of motor bearing rust

The deep groove ball bearing often appears poor operation and increased noise used by the motor. It is found that the bearing has rusted under the microscope after removing the seals, cleaning and drying.

We will discuss the causes of motor bearing rust today:

(1) It will often appear, when the motor is placed in the warehouse where the humidity is relatively large and the temperature is relatively high in one week.

(2) Block rust often appears on the surface layer near the motor rotor side, and black spot-like rust often appears on the outer surface layer of bearings with serious conditions.

(3) Oil color changes, while there is a pungent paint odor.

(4) Rust spots loose and porous, very easy to fall off automatically for very serious cases.

This rusting phenomenon of motor bearings is very similar to the “lacquer rust” reported abroad.

The rust occurs frequently in sealed ball bearings for medium and small motors according to market feedback. Therefore, it is necessary to find out the root cause and take certain effective measures to prevent it.

Principle and characteristics of bearing paint rust:

Lacquer rust is affected by internal and external overall factors: motor stator insulation paint volatilized acid molecules and moisture together by grease absorption reaction caused. This phenomenon is related to the type of insulating paint, the drying process of the stator and the storage environment of the motor.

The use of amino or phenolic insulating paint, paint in the hardening process of molecular chain instability will have low molecular substances escape: such as formaldehyde, in the temperature and humidity of the appropriate time, formaldehyde and water molecules in the weather reaction to produce formic acid, formic acid will make grease hydrolysis, corrosion bearing paint rust.

Paint rust mainly often appears in enclosed motor or enclosed packaging placed motor. This is mainly closed motor paint gas is not easy to escape the reason. The characteristics of paint rust are as follows:

Usually in the high temperature and high humidity of southern areas and high humidity of coastal areas. In the muggy season, most of the motors are placed within 1 ~ 3 months after production, and some serious motors are placed 2-3 weeks after painting rust phenomenon; Paint rust is generally manifested as normal noise during motor assembly test, and noise is unqualified after being placed for a period of time or sent to the customer for detection; Lacquer rust phenomenon mostly appears in the case of solvent-based insulating paint, sometimes the use of solvent-free paint will also appear (insufficient drying time or drying temperature).

What is the difference between precision bearings and ordinary bearings

What is the difference between precision bearings and ordinary bearings? The performance of precision bearings requires that small friction when the rotating body has high run out precision and high speed rotation. In this case, precision bearings are divided into P0, P6, P5, P4 and P2 according to ISO classification standards. P0 bearing is normal precision.

The size requirements is different. The size error (inner diameter, outer diameter, ellipse, etc.) of products with high precision grade is smaller than that of products with low precision grade.

The requirements of rotation accuracy are different. The rotation accuracy of products with high precision (inner radial run out, outer diameter run out, end run out facing raceway, etc.) is stricter than that of products with low precision.

The requirements of surface shape and surface quality are different. The surface shape and surface quality (surface roughness of raceway or groove, circular error, groove shape error, etc.) of products with high precision are stricter than those of products with low precision.

Technical requirements for the deep groove ball bearings (motor bearings)

It is a comprehensive and systematic inspection and acceptance of deep groove ball bearings (motor bearings) to the noise detection analysis and sealing performance test for micro and small deep groove ball bearings. The quality of bearings which we produced has been greatly improved after 20 years of technical research and development, process improvement and continuous updating of equipment. It is including vibration (noise detection), indistinguishable sound pass rate, accuracy reserve rate and other major performance indicators have been significantly improved.

It has good vibration performance. The vibration (velocity and acceleration) value was low, the pass rate of Z4 and V3 grade was high, the peak value of vibration acceleration was small, the mean peak factor of wave was less than 5, the statistical results of vibration velocity and acceleration were normal distribution, and the dispersion was small.

The qualified rate of the no abnormal sound bearing has reached a high level. The qualified rate of the no abnormal sound bearing is no less than 92%. Now we are trying to control the qualified rate to a higher level, and strive to control it at 99%.

Excellent sealing performance. It is 100% qualified of grease leakage rate when the temperature rise for the ordinary sealing performance, but the dust proof effect is not necessarily 100% qualified. On the contrary, dust proof, grease leakage and temperature rise three indicators are 100% qualified for the good sealing performance.

It has a good accuracy reserve rate. The dimensional accuracy and rotation accuracy of our bearings reach 100% to P6 level, and more than 90% to P5 level, and P4 level also occupies a high proportion. The statistical results of dimensional accuracy and rotation accuracy are normal distribution, and the process capability index is good.

Radial clearance control is reasonable. The clearance value is reasonably selected according to the requirements of low-noise bearings and the requirements of application scenarios and motor speed. The clearance of finished bearings is uniform and consistent, and the clearance process ability index is good.

The surface quality of parts is good. The finished bearing was dissected to test the roundness, corrugation and roughness of the raceway of the ring. The test results showed that the roundness (2-15) was within 0.5μm, the roundness (15-500) was within 0.06μm, and the roughness was within 0.03μm, and the surface quality was all at a high level.