German Bornebusch bearings Bornebusch models Bornebusch prices

Bornebusch bearings have raceways on both the inner and outer rings, and the inner and outer rings can move relative to each other along the bearing axis. This type of bearing is particularly suitable for combined loads, i.e., loads acting radially and axially at the same time. The axial load carrying capacity of angular contact ball bearings increases with the increase of the contact angle α. The contact angle is the angle between the line connecting the contact points of the ball and the raceway in the radial plane and the perpendicular to the bearing axis.

Bornebusch bearing classification

1) Single-row angular contact ball bearings can only withstand axial loads in one direction. When subjected to radial loads, additional axial forces are generated. They can only limit axial displacement of the shaft or housing in one direction. The contact angle of angular contact ball bearings is 40 degrees, so they can withstand large axial loads. Angular contact ball bearings have a non-separable design, with shoulders of different heights on both sides of the inner and outer rings. To improve the load capacity of the bearing, one side of the shoulder is machined lower, allowing more steel balls to be installed in the bearing. 2) Double-row angular contact ball bearings can withstand larger radial loads as well as combined radial and axial loads and moment loads, limiting axial displacement of the shaft in both directions. They are mainly used in components that limit bidirectional axial displacement of the shaft and housing. The tilting capability between the inner and outer rings of double-row angular contact ball bearings is limited; the allowable tilt angle depends on the internal clearance of the bearing, bearing size, internal design, and the forces and moments acting on the bearing. The maximum allowable tilt angle should ensure that no excessive additional stress is generated within the bearing. If there is a tilt angle between the inner and outer rings of the bearing, it will affect the bearing life, reduce operating precision, and increase operating noise. Double-row angular contact ball bearings generally use nylon cages or brass solid cages. When installing double-row angular contact ball bearings, note that although the bearing can withstand bidirectional axial loads, if one side has a filling slot, care must be taken to ensure that the main axial load does not pass through the raceway edge with the filling slot. During use, ensure that the raceway without the filling slot bears the main load.

Bornebusch bearing features

1) Universally matchable bearings: Universally matchable bearings are specially processed so that when installed close to each other, any combination can achieve the specified internal clearance or preload and average load distribution without using shims or similar devices. Paired bearings are applied when the load carrying capacity of a single bearing is insufficient (using tandem configuration) or when combined loads or axial loads acting in two directions need to be borne (using back-to-back or face-to-face configurations). Basic design bearings (not suitable for universal matching) are used for single bearing configurations. Basic design single-row angular contact ball bearings are mainly used in configurations where only one bearing is present at each position. Their width and protrusion are of normal tolerance class. Therefore, they are not suitable for installing two single-row angular contact ball bearings close together.

Bornebusch bearing installation

High-speed precision angular contact ball bearings are mainly used in high-speed rotating applications with light loads, requiring high bearing accuracy, high rotational speed, low temperature rise, low vibration, and a certain service life. They are often installed in pairs as support components for high-speed electric spindles and are key matching components for the high-speed electric spindles of internal grinding machines. The Kuai Yi You automation selection guide for angular contact ball bearings provides selection assistance. Angular contact ball bearings have three installation configurations: back-to-back, face-to-face, and tandem arrangement. In back-to-back installation (the wide end faces of the two bearings facing each other), the contact angle lines of the bearings diverge along the axis of rotation, increasing the radial and axial support angle rigidity and providing maximum resistance to deformation. In face-to-face installation (the narrow end faces of the two bearings facing each other), the contact angle lines of the bearings converge toward the axis of rotation, resulting in lower support angle rigidity. Since the inner ring of the bearing extends beyond the outer ring, when the outer rings of the two bearings are pressed together, the original clearance of the outer rings is eliminated, which can increase the preload on the bearings. In tandem arrangement (the wide end faces of the two bearings oriented in the same direction), the contact angle lines of the bearings are parallel and in the same direction, allowing the two bearings to share the working load in the same direction. However, when using this installation configuration, to ensure axial stability during installation, two pairs of tandem-arranged bearings must be mounted opposite each other at both ends of the shaft.

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