NEWS

Linear bearings are a low-cost linear motion system designed for use with infinite travel and cylindrical shafts. Due to the point contact between the bearing ball and the shaft, a small load is used. The steel ball rotates with minimal frictional resistance, allowing for high-precision and smooth motion.

Linear bearings are widely used in precision equipment such as electronic devices, tensile testing machines, and digital 3D coordinate measuring devices, as well as sliding parts of industrial machinery such as multi axis machine tools, punch presses, tool grinders, automatic gas cutting machines, printers, card sorting machines, and food packaging machines.

.Lubrication and Friction

.Lubricating with grease

Inject anti-corrosion oil into the interior of linear bearings. If lubricating with grease, first remove the anti-corrosion oil with kerosene or organic solvent, air dry, and then add lubricating grease.

It is recommended to use lithium soap grease with viscosity marked as N0.2

.Oil lubrication

If lubricating with oil, it is not necessary to remove the anti-corrosion oil. According to temperature changes, ISO viscosity grade VG15-100 lubricating oil can be selected

Shaft lubrication can be supplied from the oil supply pipe or from the oil hole on the outer bearing seat. Due to the fact that the sealing ring will scrape off the lubricating oil, oil lubrication is not suitable for bearings with sealing rings without holes.

.Coefficient of friction

It can be seen that the range of motion friction coefficient is 0.001-0.004. The energy loss caused by friction is minimal. When the movement speed is less than 60m/min, the temperature effect can be ignored. The friction force can be obtained by the following equation:

F=ц.·P+fs

F： Friction force (N) *: Sealing resistance (2-5N)

P: External load (N) ц: Friction coefficient

.Installation

.fit clearance

Suggest using the fitting tolerance with the inner hole of the bearing seat and the diameter of the optical axis.

Usually, bearings cannot be preloaded, but high-precision and light preloading can be applied to bearings. However, the negative diameter tolerance should not exceed the data in the table.

The clearance between the bearing box, shaft, and bearing

Installation of bearing box

.Standard type

Several methods for installing bearing housings using snap rings and fixed plates.

Installing bearings with positioning screws can cause deformation of the bearing sleeve, which should be avoided as much as possible.

.Flange type

When installing flange type linear bearings, the surface accuracy of the holes in the bearing housing that match it must be precise.

.Adjustable type (small opening type)

By aligning the openings on the bearing with those on the bearing housing, a uniform preload in the circumferential direction can be obtained.

.Large mouth type

If used in conjunction with a suitable bearing seat, large opening bearings can also be adjusted for clearance and even preloaded lightly.

.Precautions during installation

When installing a linear bearing into the bearing seat, auxiliary work should be used to avoid directly tapping the end face or sealing ring. The bearing should be evenly introduced, and a buffer plate should be used to gently tap and install it

To insert the optical axis into a linear bearing, the centerline of the shaft and bearing must be aligned. If the shaft is inserted at an angle, the ball may detach or cause deformation of the cage, resulting in damage to the linear bearing

The external load should be evenly distributed throughout the entire bearing, especially when subjected to instantaneous loads, two or more bearings should be used. Linear bearings do not bear rotational loads, otherwise accidents may occur.