SEAL SPECIFICATION GUIDE

OPERATING CONDITIONS
Eccentricity
Shaft
Centerline
Rotation
Path
de
Shaft
2de=T.I.R.
RUNOUT
(T.I.R.)
de=Dynamic Eccentricity
Center of
Rotation
Eccentricity is determined by measuring the shaft runout, TIR
and the shaft-to-bore misalignment. Combine the two results
for the total eccentricity the seal lip must follow to function
effectively. As eccentricity increases, and/or shaft speed
increases, it becomes more difficult for the lip to follow the
shaft.
Shaft
Center of
Rotation
SHAFT TO BORE
MISALIGNMENT
Bore
Centerline
Housing
Bore
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