Tsubaki: The solution for shaft locking devices
Technical Notes SELECTION GUIDE AND PROCEDURE
(1) Maximum Torque and Maximum Thrust
(2) Selection by Series
(1) Material Strength Large contact pressure applies to both the shaft and hub during installation. Select shaft and hub materials that meet the following strength requirements. σ 0.2S ≧K 2 ×P σ 0.2B ≧K 2 ×P ´ STEP 1 Shaft and Hub AS, AD, ADN, AE, FL, KE, RE, EF, TF Series
Calculate maximum torque and thrust based on transmissible capacity and safety factor. When using POWER-LOCKs for servo motor or stepping motor applications, use a safety factor greater than 1 for every maximum or peak torque.
Torque T max.
5252 • HP • sf n
=
(ft./lbs.)
n: RPM sf : Safety Factor
P : Contact pressure on the shaft P ´ : Contact pressure on the hub
σ 0.2S : Yield point of shaft material σ 0.2B : Yield point of hub material K 2 : Series coefficient (Table 2)
(2) Hub Outer Diameter Refer to the Hub Diameters table provided for each series. If none of the materials listed apply, calculate the minimum hub diameter using the following formula.
If torque and thrust apply simultaneously: Calculate and compare the total load M R with the rated transmissible torque M t .
D N : Hub outer diameter D : Hub inner diameter P ´ : Hub contact pressure σ 0.2B : Yield point of hub material K 3 : Hub configuration coefficient
Compare the T max or M R obtained from the above calculation with the catalog rated transmissible torque M t . M t ≧ T max or M R → Acceptable M t ＜ T max or M R → Use larger or multiple units. *Installing multiple units is possible for some series. When installing more than one unit, multiply the Mt value with the appropriate multiplying ratio given below.
(Refer to the appropriate Hub Diameters table.)
Note: AD series is referred to as ADN and AD-N in other parts of the world. All three describe an identical product.
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