9 Wormgear Drives

Photos of wormgear drives.

Nomenclature

a
centre distance, mm
c
clearance, mm
d
reference diameter, mm
d a
diameter of addendum circle, mm
d f
diameter of dedendum circle, mm
E
elastic modulus, MPa
F a
axial force, N
F n
normal force, N
F r
radial force, or separating force, N
F t
tangential force, or transmitted force, N
f v
equivalent coefficient of friction
I
moment of inertia, mm4
i
speed ratio, velocity ratio
j
number of gear teeth meshing per revolution
K
load factor
K A
application factor
K v
dynamic factor
K β
face load factor
K FN
bending life factor
K HN
contact life factor
L
total contact length, mm
L h
design life in hours, h
l
span between two bearings, mm
m
module, mm
m a
axial module, mm
m n
normal module, mm
m t
transverse module, mm
N
number of cycles
n
rotational speed, rpm
P
transmitted power, kW
p a
axial pitch, mm
p t
transverse circular pitch, mm
p z
lead, mm
q
worm diameter factor, worm quotient
S
housing external surface area, m2
T
transmitted torque, N·mm
t a
ambient air temperature, °C
t o
oil operating temperature, °C
u
teeth ratio, gear ratio
v
pitch line velocity, m s−1
v s
sliding velocity, m s−1
x
profile shift coefficient
Y

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