Tapered Roller Bearings
Matched Tapered Roller Bearings
Tapered roller bearings feature a cup and cone assembly. The cup is comprised of the outer ring and the cone assembly consists of inner ring, rollers, and cage. This bearing construction accommodates combined loads and provides low friction during operation. By adjusting one single row tapered roller bearing against a second tapered roller bearing and applying a preload, a rigid bearing application can be achieved.Tapered roller bearings are separable bearings. Both the inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into single row, double row and four row tapered roller bearings according to the number of columns of rolling elements.
The tapered roller bearing is designed so that the apex of the tapered face on the raceway face of the cone cup intersects with a single point on the bearing centerline. Suitable for applications with heavy load and impact load.
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Matched single row tapered roller bearings feature angular raceways of the inner and outer ring and a resulting force-transferring contact angle. Due to this, an axial load always induces a radial load, and the other way around, so tapered roller bearings are always combined with a second bearing. Paired, they can also absorb axial and combined forces and are particularly suitable for medium to high speeds in addition to radial forces. Single row tapered roller bearings can be disassembled, facilitating a separate assembly of the inner and outer rings.
The matched single row tapered roller bearing is generally used to support high radial and bidirectional axial loads. The shaft system needs to do two-way axial positioning and achieve the given preload or clearance conditions. After matched in pair, the original axial clearance of the bearing is fixed. The user can install and use the bearing directly without adjusting the spacer, which simplifies the installation procedure and avoids installation errors. Therefore, it is widely used in rolling mills, petroleum machinery, medium and large reducers, and other equipment.
Three arrangements of matched tapered roller bearings:
Tandem arrangement:
The contact lines run parallel to each other. In contrast to an X and O arrangement, the tandem arrangement can only support axial forces in one direction. This bearing pair is generally adjusted against another tapered roller bearing, which supports axial forces in the opposite direction.
X (Face to face) arrangement:
The contact lines converge relative to the bearing axis. At the same time, axial forces can be supported from both directions. The construction of the X arrangement is simple and is the most frequently used arrangement of tapered roller bearings in a matched pair.
O (Back to back) arrangement:
The contact lines diverge relative to the bearing axis. At the same time, axial forces can be supported from both directions. The support base of the O arrangement is at its most significant, which is beneficial if the component with small bearing spacing must be guided with the smallest possible tilting clearance or tilting forces must be supported. Bearing arrangements in this arrangement is relatively rigid and can also support loads resulting from tilting moments.
Measurement requirements for matched pair tapered roller bearings:
- Â When measuring the assembly height of a single set bearing and the axial clearance of the matched pair, each set bearing should be rotated to ensure that the rolling body of each set bearing is in evenly contact with the raceway and all parts of the bearings are in the correct position. If necessary, the bearing assembly height and axial clearance shall be measured under load, with 0.1 ~ 0.5kN.
- The measuring plate shall be kept horizontal, the measuring instrument shall be fixed on it, and the measuring head shall be perpendicular to it. If the height variation of the same set of gaskets is less than 0.01mm, the instrument shall select with a range of 0.001mm.
- Three points shall be evenly distributed along 120 degrees around the circumference during the measurement, and the arithmetic means value shall be taken as the actual measurement dimension.
