Selecting a Link Ball
The selected bearing must meet both the permissible load obtained from equation (1) and the dynamic load capacity obtained from equation (2).
Permissible Load P
The yield-point strength indicated in the specification tables refers to the mechanical strength of the bearing. For model BL, the yield-point strength indicates the strength when a load is applied to the ball shank in a radial direction. For model RBI, it indicates the strength when a load is applied to the ball shank in an axial direction with respect to the holder. (For the load direction, see How Load Directions Are Called .)
| Type of load | Lower limit of fS |
|---|---|
| Constant load in a constant direction | 2 to 3 |
| Fluctuating load in a constant direction | 3 to 5 |
| Load in varying directions | 5 to 8 |
According to the type of the load, select a bearing that satisfies the following equation from a mechanical strength’s viewpoint.
| P | Permissible Load (N) |
|---|---|
| Pk | Yield-point strength (N) |
| fS | Safety factor (see Table1 ) |
Dynamic Load Capacity Cd
The dynamic load capacity (Cd) refers to the upper limit of load that the spherical area of the Link Ball can receive without showing seizure while the Link Ball is rotating or oscillating. The dynamic load capacity is obtained from the following approximation formula using the static load capacity (Cs) (note) indicated in the dimensional table.
| Cd | Dynamic load capacity (N) |
|---|---|
| Cs | Static load capacity (N) |
| n | Revolutions per minute (min‒1) |
- Note) Static load capacity (Cs) refers to the value obtained by multiplying the projected area on the spherical section by the permissible surface pressure, and is used to obtain the dynamic load capacity.
