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Bearing inner and outer ring raceway tested arc-shaped channel, the channel radius slightly larger than the radius of the sphere, mainly used to bear the load, but also bear certain axial load. When the bearing radial clearance increased, with rolling bearings can bear large axial load, but also for high-speed rotation. Still work, but the impact of its service life. Should not be used in high speed thrust ball bearing is available under the bearing to withstand pure axial load.
Bearings generally use two semi-riveting steel stamping cage, known as wave-shaped cage, but the size or speed is used solid cage, this cage with stamping cage as guided by the ball, bearing inner ring retainer or outer wall to guide. With the same size compared to other types of bearings, bearing friction, vibration and noise is low, limit, high precision, however, the impact of intolerance, not suited to withstand heavy loads.
Lubricated bearings, oil coated the better, this is a common misconception. Rolling and bearing interior excess grease will cause excessive oil mixing, resulting in extremely high temperatures. Filling the number of rolling lubricant inside the bearing space to fill 1/2 to 1/3 is appropriate, high-speed should be reduced to 1/3.
Not all bearings require minimal clearance work, you must choose the appropriate clearance conditions. GB 4604-93, the bearing radial clearance is divided into five groups Group 2, 0, group 3, group 4 and group 5, clearance value of the order from small to big, where 0 is the standard clearance group. Basic radial clearance group for general operating conditions, temperature, and commonly used conventional interference fit; in high temperature, high speed, low noise, low friction bearings operating under special conditions are advised to use a large radial clearance; right precision spindle, machine tool spindle bearings should choose a smaller radial clearance; bearing can be maintained for a small amount of clearance work. In addition, separate bearings are indifferent clearance; Finally, the bearing clearance work after installation, pre-installation of the original than the clearance is small, because the bearings to withstand a certain load rotation, as well as load bearing fits and the resulting elastic deformation.
After bearing installation, in order to check for proper installation, operation should be checked. Small machines can be rotated by hand to verify rotate smoothly. Check the project due to nick, indentation caused by dysfunctional, because poor installation, mount the torque generated by poor processing unstable, because clearance is too small, the installation error, seal friction torque caused by too large and so on. Without exception, you can begin powering.
Power operation, no-load speed began to slowly improve the conditions stipulated in rated operation. Commissioning items to check whether there is abnormal sound, bearing temperature, lubricant leakage or color and so on. If abnormal, should immediately suspend operation, inspection machinery, if necessary, to remove the bearing inspection.
Rolling install the basic conditions and routine maintenance points
If there is iron bearing, burrs, dust and other foreign matter to enter, will generate noise and vibration during operation rolling, even damage the raceways and rolling elements. So, before installing the bearing, you must ensure that the mounting surface and installation environment clean.
Lubrication of the bearing operation and life has a very important influence, here to brief you choose the general principles of grease. Grease from the base oil, thickener and additives made of different types and different brands of the same type of grease performance varied widely, allowing different rotation limit, the choice is important to note. The performance of the grease base oil, typically in a low viscosity base oil for low temperature, high speed, high viscosity suitable for high temperature, high load. Between the lubrication performance thickeners, grease thickeners water determines the water resistance. In principle, you can not mix greases of different brands, and even the same kind of grease thickener, also due to the different additives adversely affect each other.
1) bearing the mounting space in the bearing installation space can accommodate a bearing shaft due to the design type by focusing on the rigidity and strength of the shaft, it is generally first determine the shaft, the bearing diameter. But bearing a variety of sizes and types of series, should choose the most suitable bearing type.
2) Load bearing load size, direction and nature of [the load bearing capacity of a basic rated load, said its value in the bearing dimension table] Rolling load full of changes, such as the size of the load, whether only radial load, axial load is one-way or two-way, and so the degree of vibration or shock. After considering these factors, again select the most suitable bearing type.
3) Speed can adapt to mechanical speed bearing types [bearing speed limit value basis using the speed limit, said its value in the bearing dimension table] bearing speed limit not only take on the bearing type is also limited to the bearing size, cage type, accuracy class , load conditions and lubrication methods, therefore, must be considered when selecting these factors.
4) with the required precision rotation rotation precision bearing types [bearing dimensional accuracy and precision rotation by bearing type has been standardized GB] machine tool spindles, respectively, gas turbine and control the machine requires high rotational accuracy, high speed and low friction, which should be used when more than five precision rolling bearings.
5) Just performance to meet the required mechanical rigidity of the bearing shaft type [bearings under load, the rolling element and raceway contact portion is elastically deformed. "High rigidity" refers to the amount of deformation that the elastic deformation is small] in the machine spindle and the last stage deceleration devices, automotive parts, to improve the rigidity of the shaft must also improve the bearing stiffness. Students bear the load bearing deformation smaller than ball bearings. The bearing preload (negative clearance) can improve rigidity. This method is suitable for angular contact ball bearings and tapered roller bearings.
6) The inner and outer rings relative inclination of the bearing inner and outer rings relative inclination produced factors (such as deflection caused by the load shaft, the shaft and the housing or the installation error in accuracy), and choose to adapt this Conditions of Use bearing type. If the inner and outer rings relative inclination is too large, due to an internal load bearing damage. So should choose can withstand this tilt bearing type.
7) Installation and removal of detachable periodic inspection frequency and method of assembly and disassembly frequent disassembly, use separable inner ring and outer ring cylindrical roller bearings, needle roller bearings and tapered roller bearings is more convenient. Tapered hole aligning ball bearings and tapered bore spherical roller bearings through the use of fasteners or withdrawal sleeve facilitates assembly and disassembly.
Bearing surface is coated with anti-rust oil, you must use clean gasoline or kerosene carefully cleaned, and then coated with a clean high-quality or high-temperature grease before installation. Cleanliness on bearing life and vibration noise is very large. But we want to remind you is: do not be fully enclosed bearing cleaning refueling.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7014ADB NSK | 70 | 110 | 20 |
| 7914CDB NSK | 70 | 100 | 16 |