German Desch bearings Desch models Desch prices

Desch 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 withstanding 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.

Desch bearing classification

1) Single-row angular contact ball bearings can only withstand axial load in one direction. When bearing radial load, an additional axial force will be generated. And they can only limit the 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 are non-separable designs, with shoulders on both sides of the inner and outer rings at different heights. To improve the load capacity of the bearing, one side of the shoulder is processed lower, allowing more steel balls to be installed in the bearing. 2) Double-row angular contact ball bearings can withstand larger combined radial and axial loads and moment loads, mainly radial loads, and limit axial displacement of the shaft in two 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 inside 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 accuracy, 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, attention should be paid: although the bearing can withstand bidirectional axial loads, if one side has a filling slot, care must be taken not to let the main axial load pass through the raceway edge with the filling slot. During bearing use, care should be taken to let the raceway without the filling slot bear the main load.

Desch bearing features

1) Universally matchable bearings. Universally matchable bearings are specially processed. When bearings are 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). Basic design bearings (cannot be used as universally matchable) are used for single bearing configurations. Basic design single-row angular contact ball bearings are mainly applied in configurations where there is only one bearing at each position. Their width and protrusion are normal tolerance grades. Therefore, it is not suitable to install two single-row angular contact ball bearings close together.

Desch bearing installation

High-speed precision angular contact ball bearings are mainly used in high-speed rotation applications with light loads, requiring high precision, high speed, low temperature rise, low vibration, and a certain service life. They are often installed in pairs as support components for high-speed motorized spindles and are key matching components for high-speed motorized spindles of internal grinding machines. Kuaiyiyou Automation Selection Guide provides selection for angular contact ball bearings. There are three installation forms for angular contact ball bearings: back-to-back, face-to-face, and tandem arrangement. In back-to-back installation (wide ends of the two bearings facing each other), the contact angle lines of the bearings diverge along the axis of rotation, which can increase the radial and axial support angle rigidity, providing maximum resistance to deformation. In face-to-face installation (narrow ends of the two bearings facing each other), the contact angle lines of the bearings converge towards the axis of rotation, resulting in lower support angle rigidity. Since the inner ring 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 of the bearings. In tandem arrangement (wide ends of the two bearings 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 form, to ensure axial stability of the installation, two pairs of tandem-arranged bearings must be installed opposite each other at both ends of the shaft.

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