Inhaltsverzeichnis
Special designs
Features
By agreement, Schaeffler manufactures plain bearings as special designs in accordance with customer requirements.
For such special designs, please consult the Schaeffler engineering service.
ACHTUNG
The feasibility of special designs should be checked as early as possible. This applies to the geometry and also to the costs.
Plain bushes
In addition to the catalogue range of metal/polymer composite plain bearings, there are numerous special designs which are run in either a predominantly rotary direction or a predominantly linear direction. A small selection of special designs already produced is shown below, ➤ Figure to ➤ Figure.
The following special designs are possible:
- made from any plain bearing material
- with different dimensions from the catalogue products
- as combined components
- pressed into rings
- with plastic moulded parts
- in different shapes
- bushes with windows and holes
- bushes with stamped oil grooves
- blanked components
- ball cups
- bearing shells
- with the sliding layer on the outside
- with different butt joint geometries.
Swivel motion and rotation
Special designs for rotary or oscillating swivel motion are developed in accordance with customer requirements, ➤ Figure and ➤ Figure.
Plain bearings for swivel motion or rotation
Ball cups
Bush/pin system with ELGOGLIDE plain bushes
In the case of ready-to-fit bush/pin systems with a clamping device, the raceway of the pin is already integrated, ➤ Figure. The raceway and the sliding material are matched to each other to form a unit that fulfils the required specifications.
The system with the integrated ELGOGLIDE plain bushes can replace steel or bronze bushes with a relubrication facility.
These units are pressed into housings and frames and require no additional means of axial location.
Due to the very high compressive strength of the ELGOGLIDE sliding material, it can easily withstand shock loads as well as static and dynamic alternating loads. Application possibilities include articulated loaders.
Ready-to-fit system with ELGOGLIDE plain bushes
Linear motion
For linear motion, there are special designs in accordance with customer requirements, ➤ Figure, and the catalogue range of linear plain bearing units, see Catalogue WF1, Shaft Guidance Systems, ➤ Figure and ➤ Figure.
Linear plain bearings
- Linear plain bearings PAB comprise an outer ring with pressed-in plain bearing bushes EGB..-E50. The design PABO has a segment cut out for supported shafts.
- Linear plain bearing units PAGH and PAGBA comprise a housing and a pressed-in linear plain bearing PAB or PABO.
Plain bearing with external coating for linear motion
Linear plain bearing
Linear plain bearing unit
Spherical plain bearings
Special designs of spherical plain bearings are products for specific bearing arrangement problems and are manufactured exclusively for specific customers or orders. The products presented here are examples taken from a large number of such developments.
Locating bearings for articulated frame steering systems
These bearings are used as locating bearings in articulated frame steering systems for construction machinery and have a high radial and axial load carrying capacity. They have sliding zones of a special geometrical design, ➤ Figure.
This prevents edge stresses in the part of the bearing under axial load. Since the bearings are supplied preadjusted and ready for mounting, there is no need for clearance setting by the customer.
Locating bearing for articulated frame steering system
Prop shaft centring bearings
These bearings are centring elements capable of cardanic type motion and are used for the damping of vibrations in rear and four wheel drive vehicles in the centre of the coupling between the gearbox and prop shaft, ➤ Figure. They support the prop shaft mass on the coupling, thus preventing eccentricity of the elastically coupled shafts. A lamellar ring made from spring steel sets the internal clearance of the bearing automatically to zero, so the unit is permanently free from clearance.
Prop shaft centring bearing
Flanged spherical plain bearings
The maintenance-free flanged spherical plain bearings are used in clutch actuation systems, ➤ Figure.
Flanged spherical plain bearing
Joint connecting rods
Joint connecting rods with maintenance-free spherical plain bearings are used in brake actuation systems, ➤ Figure.
Joint connecting rod
Spherical plain bearings for clearance-free bearing arrangements
This design has a steel/plastic sliding contact surface and is used in clearance-free bearing arrangements such as gear levers, ➤ Figure.
The preloaded rubber elements allow compensation of the effects of wear up to 0,4 mm. As a result, the bearings can exhibit preload values comparable to those of a new bearing even after a long operating life. After initial greasing, they are maintenance-free for the entire operating life.
Spherical plain bearing for clearance-free bearing arrangement
Gear lever bearing arrangements
Gear lever bearing arrangements are developed to meet the specific requirements of the vehicle manufacturer, ➤ Figure:
- continuous compensation of operating clearance
- constant tilting moment
- maintenance-free throughout the life of the vehicle
- suitable for combination with noise and vibration damping measures.
Gear lever bearing arrangement
Spherical plain bearings with bellows
The special spherical plain bearing has a particularly large motion angle, with a swivel angle of β = ±20° and a tilt angle of α = ±19°. In addition, the bearing is sealed by means of bellows, ➤ Figure.
In comprehensive tests, reliability in terms of rating life, maximum swivel and tilt angle, seal integrity and resistance to media was successfully demonstrated.
The bearing is located in the adjacent construction by means of snap rings and spacer sleeves and contributes to cost reduction due to its ease of mounting and dismounting.
Spherical plain bearing with bellows
Central joint bearings
The central joint bearing is used to connect two carriage bodies of rail vehicles and must support not only static but also dynamic loads occurring in operation, ➤ Figure. It facilitates all necessary turning, tilting and pitching motions that occur when travelling on curved tracks, across valleys or where these are caused by the nature of the track.
The central joint bearing is based on a radial spherical plain bearing that was developed with an integral anti-lift system. The bearing is easy to mount and is screw mounted to the upper and lower housings. Due to its compact, low-section design, it can be used in low-floor vehicles as well as in other types of rail vehicle.
The bearing system is protected effectively against contamination by means of integrated seals. The inner and outer ring have special coatings in order to give very good protection against corrosion.
Central joint bearing
Rod ends
For the tip/tilt cylinder pivot on fork lift trucks, special rod ends are necessary that can support high loads despite their small design envelope, ➤ Figure.
In order to support the loads, the special rod ends are forged from high strength material. They are easy to mount and maintain. The moving part is fixed to the rod end by means of cap head screws.