Page 1015 - Rollingbearings

Design considerations
Design Axial displacement Table 5

considerations To accommodate axial displacement, the Requisite basic static load rating for
applied equivalent static bearing load
shaft at the non-locating bearing position of Equivalent static Requisite basic static
high temperature insert bearings should be bearing load P 0 load rating C 0req for
Location of bearings provided with one or two grooves, 120° operating temperatures
apart, to engage a modiied grub screw: up to
250 °C 350 °C
Deep groove ball bearings (480 °F) (660 °F)
• Hexagon socket grub (set) screws with a
The selection of shaft and housing its dog point, in accordance with ISO 4028, kN kN
depends on the bearing operating condition but with a ine thread according to
and bearing size An appropriate it is needed table 10, page 357 The grub screw 2 6 9
18
4
11
to locate the shaft, provide satisfactory sup- should be secured by a nut and a spring or 6 16 27
port and allow for thermal expansion up to star lock washer (ig. 10)
the stated maximum operating bearing tem- 8 22 36
10 27 45
perature (table 6) The screws and groove(s) accommodate 15 40 67
changes in shaft length and prevent the
Insert bearings shaft from turning independently of the 20 54 90
25
67
120
bearing The sliding surfaces between the 30 80 140
For moderate loads (0,035 C < P ≤ 0,05 C), shaft and inner ring and those in the shaft
40 110 180
the shaft seats should be machined to an grooves should be coated with a lubricant
50 140 230 18
h7� tolerance For light loads and low paste suitable for the operating 60 160 270
speeds, an h8� shaft tolerance is suficient temperature
70 190 320
80 220 360
90 240 400
Symbols
100 270 450
125 340 560
C basic dynamic load rating [kN] 150 400 670
(page 1012)
200 540 890
P equivalent dynamic bearing load [kN] 300 800 1 400
(Loads for standard insert bearings, 400 1 100 1 800
page 353) 500 1 400 2 300
600 1 600 –
Operating
environment

SKF high temperature bearings are designed
to provide solutions to common issues in
high temperature applications In addition to
operations involving high temperatures and
low rotational speeds, it is important to con-
sider environmental conditions in the process
area
Since high temperature bearings are sup- Table 6
plied without preservative oils and must be Fits for high temperature deep groove ball bearings on solid steel shafts or in cast iron or
used without grease or oil lubrication, the steel housings
anti-corrosion property of the bearings is
Conditions Shaft Shaft Housing
limited Therefore, the bearings should be diameter tolerance tolerance
used in a dry environment or with a proper
sealing solution to keep the bearings dry – mm – –

Rotating inner ring load all k6 F7
Stationary inner ring load all g6 J7

1013