NSK expands size of high-load ball screw support bearings

Written by: Tom Austin-Morgan | Published:

NSK is expanding the size range of its NSKTAC03 high-load ball screw support bearings from 120 to 180mm to help OEMs produce larger, electrically operated injection moulding machines.

In comparison with self-aligning thrust roller bearings (the conventional solution to date), the higher limiting speed of NSKTAC03 angular ball bearings leads to a quicker injection process and faster machine operation. Additionally, only half the torque is required, which is caused by reduced bearing inertia that supports smooth rotation.

Angular contact ball bearings are also easier and quicker to assemble, and there is no need to adjust the preload, unlike with high-load roller bearings. Similarly, a shaft sleeve is not required.

A further important feature is that switching from self-aligning thrust roller bearings to NSKTAC03 ball bearings enables users to change from oil to grease, eliminating continuous oil refilling. In addition, lifting bolt holes now come as standard. The bolt holes facilitate the use of cranes to assemble the heavy bearings into the injection moulding machines, improving production efficiency at OEM plants.

The demand for ball screws with a higher load capacity stemmed from the need for ever-larger electrically operated injection moulding machines and servoless machines. This in turn has driven the requirement for support bearings able to offer greater performance under high loads.

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