Page 34 - Y-bearing-units

Selection of Y-bearing unit size

Equivalent dynamic Fig. 1
bearing load
The equivalent dynamic bearing load is defined
as that hypothetical radial load, constant in
magnitude and direction, which, if applied,
would have the same influence on bearing life as
the actual load to which the bearing is subjected
(† fig. 1).
If the bearing load F is constant in magnitude
and direction and acts radially, then P = F and
the load can be inserted directly into the life
equation. In all other cases, the equivalent
dynamic bearing load must be calculated.

Constant bearing load
Y-bearings and Y-bearing units are often
subjected to simultaneously acting radial and Table 2
axial loads. If the resultant load is constant in Calculation factors
magnitude and direction, the equivalent dynam- Relative Y-bearing series
ic bearing load P can be obtained from the gen- thrust YAT, YAR, YET, 17262(00),
eral equations load YEL, YSA, YSP 17263(00)
f 0 F a /C 0 e X Y e X Y
P = F r when F a /F r ≤ e 0,172 0,29 0,46 1,88 0,19 0,56 2,30
P = X F r + Y F a when F a /F r > e 0,345 0,32 0,46 1,71 0,22 0,56 1,99
0,689 0,36 0,46 1,52 0,26 0,56 1,71
where 1,03 0,38 0,46 1,41 0,28 0,56 1,55
P = equivalent dynamic bearing load, kN 1,38 0,40 0,46 1,34 0,30 0,56 1,45
1,31
0,34
0,56
0,46
0,44
2,07
1,23
F r = actual radial bearing load, kN
F a = actual axial bearing load, kN 3,45 0,49 0,46 1,10 0,38 0,56 1,15
0,54
5,17
0,46
1,04
0,56
1,01
0,42
X = radial load factor for the bearing 6,89 0,54 0,46 1,00 0,44 0,56 1,00
Y = axial load factor for the bearing
e = limiting value for F a /F r
and with reference to tables 2 and 3
C 0 = basic static load rating, kN Table 3
f 0 = bearing-dependent calculation factor Calculation factor f 0
Y-bearing series Factor f 0
The limiting value e and the load factors X and Y (sizes)
required to calculate the equivalent bearing load
for Y-bearings and Y-bearing units can be found YAT, YAR, YET, YEL, YSA, YSP
in table 2. As for deep groove ball bearings, it 203 – 204 13
205 – 212
14
depends on the value of the relative thrust load 213 – 218 15
f 0 F a /C 0 . 220 14
17262(00)
03 – 04 13
05 – 12 14
17263(00)
05 12
06 – 10 13
32