Bearing Elements

Ground raceway

Characteristics

Bearing Type

  • 4 race rings with ground raceways
  • Plastic ball cage with retained balls

Characteristics

  • Maximum possible integration capacity
  • Series application to meet cost constraints
  • Greatest possible flexibility based on preload, runnability and diameter ranges

Diameter range

  • Infinitely variable from 70 to 2000 mm

In detail

Bearing Type

Franke bearing elements in type LEL meet high standards in terms of runnability and accuracy. Their hardened and CNC-ground raceways, along with the ideal geometric adjustment of ball and raceway radius, lend them outstanding bearing properties. Bearing elements in the LEL type permit the greatest possible freedom of bearing design. The standard mounting space is between 5.9 mm and 20.9 mm. Race ring thickness of up to 20 mm and bearing sizes up to 50 mm are possible to meet special requirements.

Characteristics

Bearing elements of the LEL type consist of two inner and two outer raceways, along with a plastic cage with retained balls. The race rings are divided at one point to compensate for the temperature expansion factor. They possess compensatory properties for demanding forms of stress. LEL are generally mounted free from clearance. The preload can be defined individually to meet the specific requirement. See 'Technical information' for the adjustment methods.

Mating structure

The bearing element mounted determines the overall construction's load bearing capacity. Hence the mating construction can be made of alternative materials such as steel, aluminium or plastic. Axial and radial accuracy (see diagram below) are defined to a substantial extent by the mating components. These properties can be enhanced by boosting the accuracy of manufacture.

Constructive example

Technical details

Material Ball race rings: 54SiCr6, rolling element: 100Cr6, cage: PA12
Temperature in use –30 °C to +80 °C, briefly up to +100 °C
Circumferential speed max. 5 m/s, without seals max. 10 m/s
Lubricant grease Klüber Isoflex Topas NCA52
Lubricant schedule See 'Technical information'.
Tolerance details See 'Technical information'.