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Spherical bearings

Spherical bearings

ELA spherical bearings are made of steel, a spherical hard chrome spheroid segment, the so-called convex cup, an appropriate concave captain (PTFE) and a sliding surface on the flat surface of the cap, reinforced PTFE and steel austenitic degree 1.4404.

This design is capable of taking up horizontal movements as well as rotation through two independent sliding movements. This fulfills the requirement that structure support should result in very limited restrictions. With guide elements or additional stop rings, it is even more possible to transfer the horizontal load.

Significant for the guy is a relatively compact design and quality, that virtually no vertical movement takes place. This criterion is important for certain applications.

Anchoring to the structure is generally required. If anchoring due to unusual impacts is required, it can be done by additional anchoring plates with appropriate anchoring means.

The standard bearing design does not require anchoring plates for the simultaneous effects of vertical and horizontal loads.

In general, the anchoring methods 3 are the same as the container bearings.

ELA spherical bearings are designed and manufactured in accordance with 1337-5 and are labeled with a relevant CE marking.

Types of supports

Scheme of a KGa spherical bearing

1. Sliding austenitic stainless steel plate

2. Chrome plated dome with hardened PTFE

3. Rectangular PTFE dome container

This type of bearing can transfer displacements in the longitudinal direction as well as across the bridge. But it can not transfer horizontal tasks

Bearings of this kind can move in one direction and are fixed perpendicular to the guide feathers that transfer the horizontal loads in that direction. A tilting of the guide pins perpendicular to the direction of motion caused by the rotation is compensated by the tilting bands that can be rolled.

Unidirectional Spherical Bearing Bearings are divided into two types:

  • longitudinally fixed KGI spherical bearings that can transfer horizontal loads in the longitudinal direction of the bridge and can move in the transverse direction of the bridge
  • KGI transverse spherical bearings that can transfer horizontal loads in the transverse direction of the bridge and can move in the longitudinal direction of the bridge

These bearings can transfer the horizontal load from all directions.

This is done by means of a stop ring that locks the bearing. The sliding surface between the plane of the cap and the upper part of the bearing is used to keep the horizontal forces away from the cap.

Minimum load = 0,5 x max N

Angle of rotation: tan α = 10‰

ex = permitted longitudinal displacement

Cross travel ey = ± 20 mm

Actual height can increase up to +10mm due to material and manufacturing tolerances

If necessary, the bearings may be equipped with anchor plates or dowels.

Min. load = 0,5 x max N

Angle of rotation: tan α = 10‰

ex = permitted longitudinal displacement

Actual height can increase up to +10mm due to material and manufacturing tolerances

If necessary or necessary, the bearings may be equipped with anchor plates or dowels.

External dimensions change as they are.   

“e” in KGe is replaced by “l” (longitudinally fixed) or “q” (fixed transversally).

The following assumptions are made for this table:

Min. load = 0,5 x max N

Angle of rotation: tan α = 10‰

Actual height can increase up to +10mm due to material and manufacturing tolerances

If necessary or necessary, the bearings may be equipped with anchor plates or dowels.

External dimensions change as they are.