As shown in Fig. 5, the cross-sectional area of 9 series angular contact ball bearings (often used in the European market) is smaller compared with 0 series angular contact ball bearings (commonly used in Japan). As a result, the same size spindle can be used in a more compact housing, or alternately, a larger, more rigid spindle can be used in an equivalent sized housing. One disadvantage is that the load capacity of the 9 series bearings are smaller compared with the 0 Housing 0 series 9 series 0 series 9 series Fig. 5 High-speed angular contact bearings new 9 series
Main spindle Main spindle Main spindle series bearings due to their smaller cross-sectional area. To address this drawback, NTN has developed the“HSE9xxU bearings” that feature the high-speed
performance of the HSE9 series bearings. Optimal specifications for bearing internal design have led to 50% increase in dynamic load rating and 20% increase in axial load rating relative to conventional
similar bearing products.
Thanks to this engineering development, it is now possible to design compact, high-speed, high-rigidity main spindles employing 9 series angular contact ball bearings.
Detailed information about the high-speed angular contact bearings—9 series HSE9xxU bearings will be provided in a separate article within this technical review.
Ball screw supporting bearings
In the Asian machine tool industry, ball screw supports employ duplex angular contact ball bearings.
In the same application, European machine tool industries use double-row angular contact ball bearings whose outer rings have mounting holes. The advantages of this bearing type include a simpler mounting procedure, a decreased number of parts since the bearing can be mounted directly to the bearing housing, and no need to match bearing pairs. To its ULTAGE series of bearing product, NTN has added the “double row angular contact ball bearings BSTU for supporting ball screws”schematically illustrated in Fig. 6. This bearing type is essentially double-row angular contact ball bearing with the outer ring having mounting holes mentioned above, except that the BSTU bearing has a uniquely shaped seal. Features of this bearing include highload capacity, low contact pressure and low torque, as well as long-life grease.
Detailed information about the double-row angular contact ball bearings BSTU bearings will be provided in a separate article within this technical review.
Next Stafford Expands Shaft Collars and Couplings for Mechanical Drive Systems
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