Transferred torque
where:
|
P |
transferred power [lb ft] |
|
|
n |
speed [min -1 ] |
Pressure on groove supporting surface
1. shaft inside diameter d h > 0
a) 
b) if d min ≤d h -> d min = 1.1 d h [mm]
c) if d min ≤ 1.5 d h -> d min = 1.5 d h [mm]
2. shaft inside diameter d h = 0
where:
|
d min |
minimal shaft diameter [in] |
|
|
d h |
shaft inside diameter [inm] |
|
|
T |
torque [lbft] |
|
|
K a |
application factor |
|
|
K f |
fatigue-life factor |
|
|
S v |
desired safety |
|
|
τ Al |
Allowable Shear Stress |
Minimum splines length to transfer the torque
|
1. Fixed connection: |
 |
|
2. Flexible connection: |
 |
|
where: |
|
T |
torque [lbft] |
|
|
K a |
application factor |
|
|
K f |
wear-life factor |
|
|
K w |
application factor |
|
|
K m |
load distribution factor |
|
|
S v |
desired safety |
|
|
d s |
middle diameter = (D + d) / 2 [in] |
|
|
D |
outside diameter of groove section [in] |
|
|
d |
inside diameter of groove section [in] |
|
|
N |
number of grooves [-] |
|
|
h |
height of groove = (D - d) / 2 [in] |
|
|
s |
chamfer |
|
|
h st |
connection height h st = h - 2 s [inm] |
|
|
p Dmin |
allowable pressure on supporting surface of shaft or groove [psi] |
Allowable pressure
|
1. Fixed connection: |
 |
|
2. Flexible connection: |
 |
|
where: |
|
T |
torque [lb ft] |
|
|
K a |
application factor |
|
|
K f |
wear-life factor |
|
|
K w |
application factor |
|
|
K m |
load distribution factor |
|
|
S v |
desired safety |
|
|
d s |
middle diameter = (D + d) / 2 [in] |
|
|
D |
outside diameter of groove section [in] |
|
|
d |
inside diameter of groove section [in] |
|
|
N |
number of grooves [-] |
|
|
h |
height of groove = (D - d) / 2 [in] |
|
|
s |
chamfer |
|
|
h st |
connection height h st = h - 2 s [in] |
|
|
l f |
active key length [in] |
Strength Check
p min ≤ p ds
p min ≤ p dh
where:
|
p min |
minimal calculated h/2 pressure [psi] |
|
|
p ds |
allowable pressure in shaft [psi] |
|
|
p dh |
allowable pressure in hub [psi] |