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Rod end bearings / Spherical bearings -Teflon type Spherical Bearing

Teflon type Spherical Bearing

Teflon types are mainly targeted where slow fluctuation velocity applies. Under slow fluctuation velocity, Teflon abrasion determines the life of Spherical Bearings. Teflon Liner deformation also decides the performance ability under static load.


Definition of Load
Static Limit Load

This is the load, with which the permanent deformation does not exceed the value in Table 8 below.

Table 8 : Permanent deformation under static load

  Maximum value
Radial Static Limit Load 0.076mm
Axial Static Limit Load 0.127mm

Static Ultimate Load

The load 1.5 times the static limit load. It can be applied to Spherical Bearings without distracting them.


Oscillating Load

The test is conducted based on MIL-specification. After 25,000 cycles, the wear shall not exceed 0.152mm under this load. Figure 9 shows the association of surface pressure and life cycle of bearing from this test. Test conditions are ± 25° oscillation angle, 10cpm cycle, and constant load condition. Figure 9 shall be taken as a guideline, as the actual figure may be influenced by other factors such as temperature, load, velocity, oscillation angle, and so on.

Figure 9: Teflon Liner Allowable Stress


Calculation of load capacity
Radial projected area

The projected area is basically the same as of metal/metal types. The edge of Teflon Liner, however, shall be taken into consideration.


Allowable stress (σ)

Based on several examinations, the allowable stress is set as indicated in Table 9 below.


Table 9 : Teflon Liner Allowable Stress

  X-1118
X-1276
X-1276F
X-1820
Radial Static Limit Load 482N/mm2 { 49.2kgf/mm2 } 541N/mm2 { 55.2kgf/mm2 }
Axial Static Limit Load 309N/mm2 { 31.6kgf/mm2 } 309N/mm2 { 31.6kgf/mm2 }
Oscillation Load 220N/mm2 { 22.5kgf/mm2 } 275N/mm2 { 28.1kgf/mm2 }

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