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Ball Bearings: Guide to Selection, Applications & Calculations
Introduction
For Pumps used in Petroleum Industries and Gas Industries, we have some standard statements meant to be followed:-
Each Shaft shall be supported by two radial bearings and one double acting Thrust Bearing which may or may not be combined with one of the radial bearings. This means, The thrust bearing may or may not be in the same axis as the rest of the two radial bearings. In other words, it can also said as, the thrust bearing can be arranged in such an order that, it may or may not be a part of the system bearing calculation although supporting the shaft.
Here, there can be only three possible system of arrangements,
§ Rolling Element radial and Thrust.
§ Hydrodynamic radial and rolling element thrust.
§ Hydrodynamic radial and thrust.
Deep Groove Ball Bearings
Application: Deep Groove Bearings are used for small diameters with radial and axial loads.
Fig.1: Deep groove ball bearings
Bearings I.D: For any designated no. in any bearing company, the bearing I.D. is equal to 5 times the last two digits.
For example,
6208 = I.D. 40mm
2313 = I.D. 65mm
But things change when suffixes are added beyond the designation no. of the bearings.
Example:- 626z – here, 6mm is the I.D. and 6 mm is the thickness, with single shield.
627-2z – here, 7mm is the I.D. and 7 mm is the thickness, with double shield.
NOTE: For the selection of the bearing, ‘C’ is important. If it is equivalent to C/P x Fr, in terms of Newtons, then bearing matching the load bearing capacity will be suitable.
Supplementry Designations:
1. K – Roller and Cage assembly of a cylindrical roller thrust bearing. Example:- KNU07.
2. L – Removable inner and outer ring of a separate ring. Example – LNU207.
3. R – Separate bearing without removable inner and outer ring.
Suffixes:
A, B, C, D, E – Differed or modified internal design.
External Design:
|
Ref |
Description |
|
X |
Boundary dimensions altered to conform to ISO standards. |
|
RS and LS |
Rubbing seals at one side of the bearing |
|
2RS and 2LS |
Rubbing seals at both sides of the bearing |
|
Z |
Shield (Non-rubbing seals) at one end of the bearing |
|
2Z |
Shield (Non-rubbing Seals) at both sides of the bearing |
|
K |
Tapered Bore, 1:12 on diameter |
|
K30 |
Tapered bore, 1:30 on diameter |
|
N |
Snap ring groove in outer ring |
|
NR |
Snap ring groove in outer ring, with snap ring |
|
ZN |
Shield at one side of the bearing and snap ring groove in outer ring at other side |
|
ZNR |
As ZN, with snap ring |
|
N2 |
Two locating slots in outer ring |
|
G |
Single row angular contact ball bearing for paired mounting, back to back or face to face bounting |
|
Ref |
Description |
|
X |
Boundary dimensions altered to conform to ISO standards. |
|
RS and LS |
Rubbing seals at one side of the bearing |
|
2RS and 2LS |
Rubbing seals at both sides of the bearing |
|
Z |
Shield (Non-rubbing seals) at one end of the bearing |
|
2Z |
Shield (Non-rubbing Seals) at both sides of the bearing |
|
K |
Tapered Bore, 1:12 on diameter |
|
K30 |
Tapered bore, 1:30 on diameter |
|
N |
Snap ring groove in outer ring |
|
NR |
Snap ring groove in outer ring, with snap ring |
|
ZN |
Shield at one side of the bearing and snap ring groove in outer ring at other side |
|
ZNR |
As ZN, with snap ring |
|
N2 |
Two locating slots in outer ring |
|
G |
Single row angular contact ball bearing for paired mounting, back to back or face to face bounting |
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Contact
Contact: Mr.Robin
Phone: +86 15253131888
Email： sales@sdjrcd.com
Add：No.7 Shuanghe Street, Wenchang Sub-district Office, Changqing District,Jinan City, Shandong Province,China.
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