U.S. TSUBAKI POWER-LOCK ®
Technical Notes PRECAUTIONS
Precautions
4. Ambient Temperature POWER-LOCKs must be operated in an appropriate environment with a temperature ranging from -22ºF to 392ºF. 5. Allowable Deviation of Tightening Torque M A The allowable deviation from the specified tightening torque is ±5%. If the bolts are correctly tightened within this range with a torque wrench as instructed, the unit should achieve adequate transmissible torque M A and thrust Pax . 6. Hub Movement The hub may move, depending on the type of POWER-LOCK installed. See Selection and Procedure for details. (1) RE Series Hub Movement The hub will move when installing an RE POWER-LOCK without a snap ring. This movement is caused by the deformation of the shaft and hub and varies depending on the hub's inner-to-outer diameter ratio a N . See table below. a N ＝ D N D D ：Inner Hub Diameter mm D N ：Outer Hub Diameter mm
1. Installing to Keyed Shafts Mounting to keyed shafts such as motored shafts will reduce the transmissible torque Mt and transmissible thrust Pax by 10%.
Transmissible torque：Mt ×0.9 Transmissible thrust ：Pax×0.9
2. Installation Accuracy When a POWER-LOCK is installed into a straight hub bore, the installation accuracy depends on the hub's length as shown below. Ex: Hub End Face Runout Below 0.002 x r mm Er: Outer Hub Diameter Runout Below 0.05mm
Series ADN
Hub Length B L
AE RE KE TF EF
L 2 L 2 L 2
< <
AS and EL are not self-centering. Refer to Selection Procedure for details.
3. Hub's Outer Diameter Deformation
When a POWER-LOCK is mounted onto a hub, contact pressure P' will exert on the hub's inner surface, causing the hub's outer diameter to experience a plastic deformation. The specific degree of deformation cannot be determined for it depends on the distribution of P' and the type of hub. However, the following formula can be used to obtain rough deformation values. Note: Following contains metric numbers and equations. If there are questions, contact U.S. Tsubaki.
Hub Movement inch
Model Number
a N =3
a N =2 a N =1.5
0.003
0.004
PL005X018 RE-SS 0.002
0.003
0.004
PL006X019 RE-SS 0.002
0.004
0.005
PL008X021 RE-SS 0.003
0.005
0.007
PL010X026 RE-SS 0.004
0.006
0.007
PL011X027 RE-SS 0.005
0.007
0.009
PL012X028 RE-SS 0.006
0.007
0.001
PL014X030 RE-SS 0.006
0.007
0.001
PL015X031 RE-SS 0.006
2×K 3 ×P´ ( ) 2 -1
D N E
0.007
0.001
PL016X032 RE-SS 0.006
△D N ≒
×
0.007
0.009
PL017X033 RE-SS 0.006
D N E
0.007
0.009
PL018X034 RE-SS 0.006
0.009
0.012
PL019X035 RE-SS 0.007
0.011
0.015
PL020X039 RE-SS 0.009
0.011
0.015
PL022X041 RE-SS 0.009
0.014
0.019
PL024X043 RE-SS 0.012
P´ ：Contact pressure of the hub MPa E ：Young's Modulus For steel: E=205800 MPa D ：Hub inner diameter mm D N ：Hub outer diameter mm △D N ：Hub's outer diameter deformation mm K3 ：Hub configuration coefficient (See appropriate Hub Diameters table.)
0.014
0.019
PL025X044 RE-SS 0.012
0.015
0.021
PL028X049 RE-SS 0.013
0.016
0.021
PL030X050 RE-SS 0.013
0.015
0.021
PL032X052 RE-SS 0.013
0.018
0.024
PL035X058 RE-SS 0.015
0.020
0.028
PL038X060 RE-SS 0.017
0.020
0.028
PL040X063 RE-SS 0.017
0.023
0.031
PL042X066 RE-SS 0.019
0.023
0.031
PL045X068 RE-SS 0.020
0.026
0.035
PL048X072 RE-SS 0.022
0.026
0.035
PL050X075 RE-SS 0.022
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