7216 CD/P4AQBCB
Matched set of four super-precision, high-capacity, D design, single row angular contact ball bearings
These sets of four matched super-precision angular contact ball bearings are available as universally matchable bearings or in preconfigured arrangements.
Sets of four bearings arranged in tandem need to be mounted against a single bearing, or a set of bearings in tandem, to achieve the desired preload. All the other arrangements are available in different preload classes and correct mounting results in preload within a predetermined range, without the need for shims or similar devices. The bore and outside diameters of the bearings are matched to within a maximum of one-third of the permitted diameter tolerance, to provide better load distribution than single universally matchable bearings.
- Very high running accuracy
- High axial and radial stiffness
- High axial and radial load carrying capacity
Dimensions
| d |
80 mm
|
Bore diameter |
| D |
140 mm
|
Outside diameter |
| B |
104 mm
|
Width |
| d1 |
99.5 mm
|
Shoulder diameter of inner ring (large side face) |
| r1,2 |
min.2 mm
|
Chamfer dimension |
| r3,4 |
min.1 mm
|
Chamfer dimension |
Abutment dimensions
| da |
min.91 mm
|
Diameter of shaft abutment |
| Db |
max.134.4 mm
|
Diameter of housing abutment |
| ra |
max.2 mm
|
Radius of fillet |
| rb |
max.1 mm
|
Radius of fillet |
| dn |
103.4 mm
|
Position of oil nozzle |
Calculation data
| Basic dynamic load rating |
C |
225 kN
|
| Basic static load rating |
C0 |
300 kN
|
| Fatigue load limit |
Pu |
12.2 kN
|
| Attainable speed for grease lubrication |
|
To be calculated: Single bearing (9500) x speed reduction factor (see table below)
|
| Attainable speed for oil-air lubrication |
|
To be calculated: Single bearing (16000) x speed reduction factor (see table below)
|
| Contact angle |
α |
15 °
|
| Ball diameter |
Dw |
17.462 mm
|
| Number of rows |
i |
4
|
| Number of balls (per bearing) |
z |
17
|
| Reference grease quantity (per bearing) |
Gref |
18.1 cm³
|
Preload and stiffness (back-to-back, face-to-face)
| Preload class |
|
B
|
| Preload |
G |
1 280 N
|
| Axial stiffness |
|
260 N/µm
|
Correction factors for preload calculation
| Correction factor dependent on bearing series and size |
f |
1.1
|
| Correction factor dependent on contact angle |
f1 |
1
|
| Correction factor, preload class B |
f2B |
1
|
| Correction factor for hybrid bearings |
fHC |
1
|
