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Design considerations

Pins

For general information, refer to Bearing interfaces.

For support rollers with an inner ring, the pin/shaft should be machined to tolerance class g6Ⓔ under the following conditions:

  • stationary inner ring load
  • where easy displacement of the inner ring is required
To exploit the full load carrying capacity of support rollers without an inner ring, the pin/shaft should:
  • be machined to tolerance class k5Ⓔ
  • be machined to a surface finish similar to a bearing raceway
  • have the same hardness as a bearing raceway
For additional information about raceways on shafts, refer to Raceways on shafts and in housings.

Support surfaces

For support rollers without flange rings, the outer ring support surfaces:
  • guide the outer ring and cage during operation
  • must be fine turned
  • must be free of burrs and clean
  • should extend to at least half the outer ring side face (fig. 1), if unhardened - hardened surfaces may be smaller
Heavily loaded support rollers with flange rings should be axially supported:

Axial gap

The following support rollers must be located without any axial gap:
  • support rollers without flange rings, with an inner ring (fig. 1)
  • support rollers with flange rings (fig. 2)
Support rollers without an inner ring must have an axial gap ≥ 0,2 mm between the outer ring and the support surfaces (fig. 3).
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