Dynamic loadsCompared to a typical rolling bearing, where the outer ring is fully supported in a housing, a track runner bearing has only a small contact area between its outside surface and the track. The actual contact area depends on the applied radial load and the profile of the runner surface. Deformation of the outer ring, caused by this limited contact, alters the load distribution in the bearing, which affects load carrying capacity. The basic load ratings listed in the product tables take this into account. The ability to accommodate dynamic loads depends on the requisite life, but it is also important to consider the strength of the outer ring. Therefore, the value of the maximum permissible dynamic radial load Fr max (→ product tables) should not be exceeded.
Static loads
The permissible static load for a track runner bearing is determined by the smaller of the values F0r max and C0 (→ product tables). If requirements for smooth running are below normal, the static load may exceed C0, but should never exceed the maximum permissible static radial load F0r max.
Axial loadsSupport rollers with flange rings can generally accommodate axial loads that are induced when operating in an inclined or tilted position. The magnitude of permissible load depends on the internal design.
Minimum load

For additional
(→ Requisite minimum load)

Frm = 0,0167 C0 

Perform calculations

The weight of the components supported by the bearing, together with external forces, generally exceed the requisite minimum load. If this is not the case, the bearing must be subjected to an additional radial load.

bearing load

For additional
(→ Equivalent dynamic bearing load)
P = Fr

Perform calculations
Equivalent static bearing load

For additional
(→ Equivalent static bearing load)
P0 = Fr

Perform calculations
C0=basic static load rating [kN] (→ product tables)
Fr=radial load [kN]
Frmax=maximum permissible dynamic radial load [kN] (→ product tables)
F0rmax=maximum permissible static radial load [kN] (→ product tables)
Frm=minimum radial load [kN]
P=equivalent dynamic bearing load [kN]
P0=equivalent static bearing load [kN]
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