U.S. TSUBAKI POWER-LOCK ®
Technical Notes SELECTION GUIDE AND PROCEDURE
(3) Hollow Shaft Inner Diameter Calculate the inner diameter of a hollow shaft, using the following formula.
STEP 3 Radial Load
If radial loads apply to POWER-LOCKs as in wheel applications, calculate the contact pressure on the shaft Prad, and hub P’rad. Then, compare the values with those provided in the appropriate catalog table and confirm that they fall within the allowable range.
d B : Hollow shaft inner diameter d : Shaft diameter P : Contact pressure on the shaft σ 0.2S : Yield point of shaft material K 3 : Hub configuration coefficient (Refer to the Hub Diameters table by series.)
Pr : Radial load < : POWER-LOCK width mm d : Shaft diameter D : Hub inner diameter
1.3 x Pr d x < 1.3 x Pr D x <
P rad =
P´ rad =
P : Contact pressure on the shaft MPa P´ : Contact pressure on the hub MPa
If a radial load applies, calculate the required hub outer diameter D n and inner hollow shaft diameter d B by adding Prad and P’rad to P and P’ respectively.
Accurate centering is achieved by adjusting the hub’s width to a value calculated based on the length of a centering portion, usually above d/2 (half of shaft diameter). In addition, the guide portion tolerance should be determined according to the required degree of accuracy. STEP 2 AS Series Centering Guide Portion
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