9 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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