Spherical roller bearings are principally provided with two rows of symmetrical spherical rollers and a common sphere raceway in out ring, the two inner ring raceways are included at an angle to the bearing axial. The bearings have good self-aligning ability and can operate when the shaft deflection under load or the shaft deflection under load or the shaft misaligningment in mounting, and their permissible aligning angle is 1 to 2.5 degree. This type of bearings has heavy load carrying capacity and anti-impact ability, in addition to radial loads, they also can carry axial loads in two directions. In general, this type of bearings permit a low limiting speed.
Boundary dimensions(mm) |
Basic load ratings(N) |
Limiting speeds(rpm) |
Mass(g) |
Bearing Number |
||||||
d |
Fw(F) |
D |
B(C) |
D1 |
S1 |
Cr |
Cor |
Oil |
(Approx.) |
XLB |
12 |
15 |
28 |
12 |
24.5 |
0.5 |
4660 |
5700 |
24000 |
37 |
PNA12/28 |
15 |
18 |
32 |
16 |
27 |
0.5 |
9800 |
14000 |
22000 |
62 |
PNA15/32 |
17 |
20 |
35 |
16 |
30.5 |
0.5 |
10500 |
15500 |
21000 |
73 |
PNA17/35 |
20 |
25 |
42 |
20 |
36.5 |
0.5 |
14900 |
27800 |
18000 |
136 |
PNA20/42 |
22 |
28 |
44 |
20 |
38.5 |
0.5 |
20500 |
31900 |
16000 |
145 |
PNA22/44 |
25 |
30 |
47 |
20 |
42 |
0.5 |
20980 |
33500 |
15000 |
157 |
PNA25/47 |
30 |
35 |
52 |
20 |
47.5 |
0.5 |
21500 |
39600 |
13000 |
181 |
PNA30/52 |
35 |
40 |
55 |
20 |
50.5 |
0.5 |
24000 |
44700 |
11000 |
177 |
PNA35/55 |
40 |
45 |
62 |
20 |
58 |
0.5 |
24800 |
50900 |
10000 |
227 |
PNA40/62 |