Technical Data Locking Device Sizing and procedure
To view selection procedures and precautions, please proceed to the following.
Click here to narrow down the product series or to make a tentative selection.
If you have specific conditions of use and wish to make a detailed selection, please click here.
Selection of AE series
1. Maximum Torque and Maximum Thrust
Calculate maximum torque and thrust based on transmissible capacity and safety factor f.
※For servo motor and stepping motor locking, use the maximum torque (peak torque) of each as the maximum torque to be generated (Tmax).
| SI Unit |
|---|
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Tmax = 9550 × H n ・f Tmax = Max. Generated Torque (N・m)
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| Gravity unit |
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Tmax = 974 × H n ・f Tmax = Max. Generated Torque (kgf・m)
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Pmax = Pax・f
- Pmax：Max. Thrust Load kN{kgf}
- Pax：Thrust load kN{kgf}
- f：Service factor
f：Service factor
| Load conditions | Service factor | |
|---|---|---|
| Load without shock | Low inertia | 1.5～2.5 |
| Load with minor shock | Medium inertia | 2.0～4.0 |
| Load with major shock | High inertia | 3.0～5.0 |
If only torque is applied
Compare the Tmax obtained from the above calculation with the catalog rated transmissible torque Mt.
Mt ≥ Tmax → Acceptable
Mt < Tmax → Use larger size.
If torque and thrust are applied simultaneously
Calculate the total load MR, and compare it with transmissible torque Mt.
MR = Tmax2 + (Pmax × d 2 )2
- Tmax：Max. Generated Torque N・m{kgf・m}
- Pmax：Max. Thrust Load N{kgf}
- d：Shaft diameter m
Compare the MR obtained from the above calculation with the catalog rated transmissible torque Mt.
Mt ≥ MR → Acceptable
Mt < MR → Use larger size.
*Installing multiple units is not possible for this series.
2. Shaft and Hub
(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.
σ0.2S ≧ 1.2 × P σ0.2B ≧ 1.2 × P'
- P ：Shaft-side contact pressure MPa{kgf/mm2}
- P'：Hub-side contact pressure MPa{kgf/mm2}
- σ 0.2S：Yield point of shaft material MPa{kgf/mm2}
- σ 0.2B：Yield point of hub material MPa{kgf/mm2}
Please refer to the strength table for iron and steel materials, which shows the yield point values of typical steel materials.
(2) Hub Outer Diameter
Refer to the major specifications page for AE Series.
If none of the materials listed is applied, calculate the minimum hub diameter using the following formula.
Hub outer diameter DN ≧ D σ0.2B + K3・P' σ0.2B - K3・P'
- DN：Hub outer diameter mm
- D ：Inner Hub Diameter mm
- P'：Hub-side contact pressure MPa{kgf/mm2}
- σ 0.2B：Yield point of hub material MPa{kgf/mm2}
- K3：Hub configuration coefficient (Refer to the major specifications page for each product. )
(3) Hollow Shaft Inner Diameter
Calculate the inner diameter of a hollow shaft, using the following formula.
Hollow shaft inner diameter dB ≦ d × σ0.2S - 2・P・K3 σ0.2S
- dB：Hollow shaft inner diameter mm
- d：Shaft diameter mm
- P：Shaft-side contact pressure MPa{kgf/mm2}
- σ0.2S：Yield point of shaft material MPa{kgf/mm2}
- K3：Hub configuration coefficient (Refer to the major specifications page for each product. )
3. Radial load
If radial loads are applied to the products, as in belt drive applications, calculate the contact pressure on the shaft Prad and the contact pressure on the hub P'rad. Then, catalog table and confirm that they fall within the allowable deviance range in the table3.
Prad = 1.3 × Pr d × ℓ
P'rad = 1.3 × Pr D × ℓ
- Pr：Radial load N{kgf}
- ℓ：Width of hub and outer ring contact surface mm
- d：Shaft diameter mm
- D：Inner Hub Diameter mm
- P：Shaft-side contact pressure MPa{kgf/mm2}
- P'：Hub-side contact pressure MPa{kgf/mm2}
If a radial load applies, calculate the required hub outer diameter Dn and inner hollow shaft diameter dB by adding Prad and P'rad to P and P' respectively.
| Series | Prad(P'rad)/P(P') |
|---|---|
| AE | 20% or less |
