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Help CenterAbove 420mm Dimension Standard Precision Tapered Roller Ball Bearings 30220
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Certification:ISO9001, ISO14001
Above 420mm Dimension Standard Precision Tapered Roller Ball Bearings 30220
Precision Tapered Roller Bearings
WD tapered roller bearings are produced by WD in many designs and sizes to match their many uses.These can be grouped as follows
Adjustment and running-in When adjusting tapered roller bearings against each other, the bearings must be rotated, so that the rollers assume their correct position, i.e. the large end face of the rollers must be in contact with the guide flange.
Conventional tapered roller bearings normally have a relatively high friction torque during the first hours of operation, which drops to a lower level after the running-in period. During this running-in period, bearing temperature increases rapidly because of the high initial friction and falls off to an equilibrium level as the running-in phase is completed.
This running-in phase is considerably reduced with bearings made to the specification. In these bearings, the initial friction is also much lower, so that temperature increase is almost negligible. This also applies to the high-performance CL7C specification bearings, which are designed for easy adjustment.
Misalignment The ability of a conventional single row tapered roller bearing to accommodate angular misalignment of the inner ring with respect to the outer ring is limited to a few minutes of arc. Bearings have the logarithmic contact profile and can tolerate misalignments of approximately 2 to 4 minutes of arc.
These guideline values apply provided the position of the shaft and housing axes are constant. Larger misalignment is possible, depending on the load and requisite service life. For additional information, please contact the application engineering service.
Cages
WD tapered roller bearings are fitted with one of the following cages.
-A pressed window-type steel cage, roller centred.
-An injection moulded window-type cage of glass fibre reinforced polyamide 6, 6, roler centred.
-A steel pin-type cage
Minimum load In order to provide satisfactory operation, tapered roller bearings, like all ball and roller bearings, must always be subjected to a given minimum load, particularly if they are to operate at high speeds or are subjected to high accelerations or rapid changes in the direction of load. Under such conditions, the inertia forces of the rollers and cage, and the friction in the lubricant, can have a detrimental influence on the rolling conditions in the bearing arrangement and may cause damaging sliding movements to occur between the rollers and raceways.
The requisite minimum radial load to be applied to standard tapered roller bearings can be estimated from
Frm = 0, 02 C Where
| Frm |
=
|
minimum radial load, kN |
| C |
=
|
basic dynamic load rating, kN (see product table) |
When starting up at low temperatures or when the lubricant is highly viscous, even greater minimum loads may be required. The weight of the components supported by the bearing, together with external forces, generally exceeds the requisite minimum load. If this is not the case, the single row tapered roller bearing must be subjected to an additional radial load, which can be achieved easily by applying preload. For additional information, refer to the section “Bearing preload”.
Equivalent dynamic bearing load
| P |
=
|
Fr | when Fa/Fr =re |
| P |
=
|
0, 4 Fr + Yfa | when Fa/Fr >re |
| The values of the calculation factors e and Y | |||
| can be found in the product tables. |
Equivalent static bearing load
| P0 = 0, 5Fr + Y0Fa |
| When P0 < Fr, P0 = Fr should be used. The value of the calculation factor Y0 can be found in the product table. |
Determination of axial load When a radial load is applied to a single row tapered roller bearing, the load is transmitted from one raceway to the other at an angle to the bearing axis and an internal axial force will be produced in the bearing. It must be considered when calculating the equivalent bearing loads for bearing arrangements consisting of two single bearings and/or bearing pairs arranged in tandem.
The necessary equations are provided in table 3 for the various bearing arrang
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