Loads


Single row cam rollers
Double row cam rollers
Dynamic loadsCompared to a typical rolling bearing, where the outer ring is fully supported in a housing, a cam roller 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 table) should not be exceeded.
Static loads
The permissible static load for a cam roller is determined by the smaller of the values F0r max and C0 (→ product table). 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 loadsCam rollers are intended for predominantly radial loads. If an axial load acts on the outer ring, as when the cam roller runs against a guide flange, it produces a tilting moment and the service life of the cam roller may be reduced as a consequence.
Minimum load

For additional
information
(→ Requisite minimum load)

Frm = 0,0167 C0 


Perform calculations

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

For additional
information
(→ Equivalent dynamic bearing load)

Fa/Fr ≤ e
→ P = Fr


Fa/Fr > e
→ P = 0,46 Fr + Y Fa


Perform calculations

Fa/Fr ≤ 0,8
→ P = Fr + 0,78 Fa


Fa/Fr > 0,8
→ P = 0,63 Fr + 1,24 Fa


Perform calculations
Equivalent static bearing load

For additional
information
(→ Equivalent static bearing load)

P0 = 0,6 Fr + 0,5 Fa


P0 < Fr → P0 = Fr


Perform calculations
P0 = Fr + 0,66 Fa

Perform calculations

where
C0=basic static load rating [kN] (→ product table)
e=limit for the load ratio depending on the relationship f0 Fa/C0 (table 1)
f0=calculation factor (→ product table)
Fa=axial load [kN]
Fr=radial load [kN]
Fr max=maximum permissible dynamic radial load [kN] (→ product table)
F0r max=maximum permissible static radial load [kN] (→ product table)
Frm=minimum radial load [kN]
P=equivalent dynamic bearing load [kN]
P0=equivalent static bearing load [kN]
Y=calculation factor for the axial load, depending on the relationship f0 Fa/C0 (table 1)
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