Crossed Tapered Roller Bearing

Crossed Tapered Roller Bearing have two sets of raceways and rollers combined at right angles with each other, allowing the bearing to bear radial loads and axial thrust loads simultaneously. It can withstand high overturning moment and is widely used in large gear-hobbing machine, industrial robot, precision worktable, vertical boring machine and grinding machine spindle.

High Overturning Moment

Overturning moments are the forces that seek to overturn a structure and shear it away from its base. Resisting moments are those that oppose the overturning moment and help to stabilize the structure.

Unlike ball bearings, crossed rollers have a much larger contact area and therefore are less likely to deform. They also have greater rigidity, so they can support heavier loads and provide more precise movement.

Crossed roller bearings are compact precision bearings that can simultaneously carry radial, axial and tilting moment loads. They have a split outer ring and an inner ring with alternate tapered rollers in crossed position separated by nylon spacers. They are especially suitable for joint and rotating parts of industrial robots, CNC rotary tables, indexing workbenches, measuring instruments, machine tools and medical equipment.

High Rotational Accuracy

The rollers of a Crossed Tapered Roller Bearing have a full line contact with the track surface, making it difficult for them to deform. This gives the bearing high rotational accuracy.

They can handle radial, thrust and moment loads at the same time because of their special design. They feature rollers crossed at intervals between inner and outer rings, allowing one bearing to withstand multiple-direction loads (axial load or momentum load).

The split structure of the standard type allows easy handling and mounting, while the two halves are fastened together using bolts. This prevents the bearing from separating during transport or operation, and enables a stable assembly. This is particularly useful in industrial robots, working machinery and medical facilities that require compactness, rigidity and high speed.

High Rigidity

Crossed roller bearings combine the rolling elements of two separate linear bearings into a single unit. They can support radial, thrust and moment loads at the same time and have high rigidity compared with conventional bearings.

The spacers incorporated between the rollers prevent the inner and outer rings from touching each other during rotation. This improves the rigidity of the bearing and reduces mounting errors.

They can also handle a high overturning moment, making them ideal for industrial robots and machine tools. They are also used in medical equipment and IC manufacturing equipment. They are supplied in a standard version with distance cages or in the full-complement version without them (suffix V). They are ready for grease lubrication and contain fixture bores for temperature sensors.

Low Friction

Due to the X arrangement of the rollers, this bearing can support high axial forces in both directions and tilting moment loads. This allows conventional bearing arrangements that comprise two axial and one radial bearing positions to be reduced to just one.

The rolling elements are guided in V-shaped grooves in the facing circumferential surfaces of the inner and outer supporting rings. The front surfaces of consecutive roll bodies (called transition radii) lie against the V-shaped grooves, and they are reliably spaced apart by a segmented retainer.

The spacing of the rollers can be adjusted using a cage or separator. Metal cages use tabs that fit into notches in the bearing, while resin cages have disc-shaped spacers that allow more rollers to be fitted closer together and increase load capacity.

Easy Maintenance

The Crossed Tapered Roller Bearing has two sets of raceways and rollers brought together at right angles, with alternate rollers staggered. This design saves space and pedestal materials. Its steep-angle tapered geometry increases the effective bearing span several times greater than the width of the bearing. This makes it capable of handling high overturning moments and is widely used in large gear-hobbing machine, industrial robot, high speed vertical lathe, high precision worktable, vertical boring machine and grinding machine spindles etc.

The bearing should be lubricated regularly. If the lubrication is insufficient, the friction will increase, and this may cause damage to the slewing bearing. It is also important to keep the surroundings clean, because even dust that cannot be seen has a negative effect on the performance of the bearing.