Linear bearings are linear motion systems that are produced at low cost and are used with infinite strokes in conjunction with cylindrical shafts. Because the bearing ball is in point contact with the shaft, the use load is small. The steel ball rotates with a small frictional resistance so that a high-precision smooth motion can be obtained.
Linear bearings are widely used in electronic equipment, tensile testing machines and digital three-dimensional coordinate measuring equipment and other precision equipment, as well as multi-axis machine tools, presses, tool grinders, automatic gas cutting machine, printers, card sorters, food packaging machines and other industrial machinery sliding part.
* Lubrication and friction
* Grease-lubricated linear bearings are internally filled with anti-corrosion oil. If grease is used, first remove the anti-corrosion oil with kerosene or organic solvent, and then add grease after air drying.
It is recommended to use a lithium soap grease with a sticky label of N0.2.
* Oil Lubrication When using oil lubrication, it is not necessary to remove the anti-corrosion oil. According to the temperature change, the lubricant with ISO viscosity class VG15-100 can be used. Shaft lubrication can be given from the oil supply pipe or from the oil hole on the outer bearing seat. oil. Since the seal ring scratches the lubricating oil, oil lubrication does not apply to non-porous bearings with seal rings.
*Friction coefficient As can be seen from Figure 5, the coefficient of motion friction is in the range of 0.001-0.004. The energy loss due to friction is small. When the speed is less than 60m/min, the temperature effect is negligible. The friction force can be derived from the following equation:
F=ц.·P+fs
F: friction force (N) *: sealing resistance (2 to 5N)
P: Load (N) ц: Coefficient of friction
*installation
* Coordinating clearances are recommended for use with the bearing housing bore and optical axis diameter. In general, bearings cannot be preloaded, but high precision and light preload can be added to the bearings. However, the negative diameter tolerance should not exceed the data in the table.
Bearing box and shaft and bearing clearance.
Precautions during installation:
When the linear bearing is installed in the bearing seat, auxiliary work shall be used to avoid direct striking of the end face or the seal ring, the bearing shall be used to be evenly introduced, and the buffer plate shall be used to insert the optical axis into the linear bearing by gently tapping and loading. Center the axis of the shaft and the bearing. If the shaft is inserted obliquely, the balls may come off, or the cage may be deformed, and the linear bearing may be damaged. The applied load should be evenly distributed over the entire bearing. Especially when subjected to momentary loads, two or more bearings should be used. Linear bearings do not withstand rotating loads or they can cause accidents.
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