Installation instructions for tapered roller bearings
Installation instructions for tapered roller bearings
When fitting NILOS-RINGS AV or AK to tapered roller bearings, one point in particular must be observed: For both horizontal and vertical mounting, the steering knuckle or bearing housing must be positioned exactly in the center and parallel to the axis (2). Under unfavorable circumstances, the sealing edge can be damaged if the mounting is tilted,
so that a perfect seal can no longer be guaranteed.
The dimension “w” (1) for all NILOS-RINGS type AK in the relevant dimension tables indicates the diameter of the circle on which two retaining lugs are provided to prevent rotation. When installing the NILOS-RING AK, it must therefore be ensured that the two retaining lugs engage in the corresponding recesses on the thrust ring or on the steering knuckle.
The two retaining lugs on the NILOS-RING type AK are offset by 180°, they have a diameter at the base of approx. 4 mm and a height of approx. 1.5 mm. Depending on the manufacturing options, either two matching recesses or – for easier installation – a 2 mm deep and 4.5 mm wide groove can be arranged in the bearing part that is pressed on. This groove must then be interrupted by a small hammered-in stop pin, which secures one of the two retaining lugs in the event of possible rotation.
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Different methods are used for the adjustment of tapered roller bearings from company to company.
A distinction is made, among other things:
- Tighten the bearing screw connection up to the axial play “0” (3) using a normal nut driver. Then loosen the screw connection by a certain amount (1/6 to 1/12 turn) to achieve the desired bearing play and then secure the screw connection (4).
- Tighten the screw connection with a torque wrench to a predetermined, constant torque. Then loosen and secure the screw connection as described under 1.
- Tighten the screw connection either with a normal nut wrench, then loosen the screw connection and measure the axial play of the bearing, if necessary correct the axial play by further loosening or tightening the screw connection. Once the desired axial play has been achieved, secure the screw connection.
The NILOS-RING AV or AK can be installed without hesitation for all types of adjustment. The axial forces achieved when positioning the bearing with the screw connection are many times higher than the contact pressure of the NILOS-RING sealing edges. However, the contact pressure of the NILOS-RING sealing edge can sometimes be felt when the bearing is rotated. Under no circumstances should it be concluded from this that the bearing arrangement may not have the required axial play. The NILOS-RING has run in after a very short running time at operating speed.
The elasticity of the NILOS-RING material also allows the axial play of the bearing to be measured. There is no risk of the sealing edge of the NILOS-RING lifting off the tapered roller bearing or being permanently deformed during the axial clearance measurement. The inherent elasticity of the NILOS-RING is many times higher than the normally permissible axial play of the bearing.
Important:
There must be a gap of at least 1 mm between the NILOS-RING and the adjacent machine part behind the outside diameter of the NILOS-RING.