Worm Gear¶
Introduced in MORe v4.3
Worm gear link properties implement a worm drive. Only the linear elastic behaviour is modelled, non-linearities are neglected. The simplifications are:
any kind of backlash is neglected
the force pushing the worm and the wheel apart (due to the pressure angle of the teeth) is not modelled and has to be added as load in an analysis if desired
irregular transmission due to the teeth is not modelled
local deformations of the worm and the wheel are not modelled
Definition¶
Source and target interfaces should be chosen as shown in following figure:
Source interface¶
Type |
Stationary interface (6dof) |
Topologies |
Peripheral face of the worm |
Location |
Center of worm |
u direction |
Axial, along center line |
v direction |
Transversal |
w direction |
Normal, towards the wheel |
Target interface¶
Type |
Stationary interface (6dof) |
Topologies |
Peripheral face of the wheel |
Location |
Center of wheel |
u direction |
Axial, along center line of the worm |
v direction |
Parallel to the v-direction of the source interface |
w direction |
Parallel to the w-direction of the source interface |
Recommended link settings¶
Use ground for source |
unchecked |
Location master |
none |
Orientation master |
either source or target |
Parameters¶
Parameter |
Unit |
Description |
|---|---|---|
Worm number of starts |
Number of starts on the worm shaft |
|
Wheel number of teeth |
Number of teeth on the worm wheel |
|
Wheel radius |
m |
Radius of the pitch line of the wheel |
Contact stiffness |
N/m |
Stiffness of the contact between the teeth |
Contact viscous damping |
Ns/m |
Viscous damping of the contact between the teeth |
Contact hysteric damping |
None |
Hysteric damping of the contact between the teeth |