Design of bearing arrangements
Location of bearingsFor moderate loads (0,035 C < P ≤ 0,05 C), the shaft seats for Y‑bearings should be machined to an h7 tolerance. For light loads and low speeds, an h8 shaft tolerance is sufficient.
Operating environmentSince high temperature bearings are supplied without preservative oils and must be used without grease or oil lubrication, the anti-corrosion property of the bearings is limited. Therefore, the bearings should be used in a dry environment or with a proper sealing arrangement to keep the bearings dry.
Axial shaft elongation
To accommodate axial shaft elongation, the shaft on the non-locating side should be provided with either one groove, or two grooves located 120° apart, to engage a modified grub screw:
- Hexagon socket grub (set) screws with a dog point, in accordance with ISO 4028:2003, but with a fine thread according to the product table. The grub screw should be secured by a nut and spring washer or star lock washer (fig. 1).
Slotted pan head screws in accordance with ISO 1580:2011, but with fine thread according to the product table, locked with a spring or star lock washer (fig. 2).
The screws and groove(s) accommodate changes in shaft length and prevent the shaft from turning independently of the bearing. The ends of the grub screws should be ground and the sliding surfaces in the shaft grooves coated with a lubricant paste suitable for the operating temperature.