========== Gear drive ========== Gear drive link properties implement a toothed gear 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 gears 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 deformation of the gears is not modelled ---------- Definition ---------- Source and target interfaces should be chosen as shown in following figure: .. image:: media/lp_gear.png :alt: Gear drive link definition :scale: 100 % ^^^^^^^^^^^^^^^^^^^^ Source interface ^^^^^^^^^^^^^^^^^^^^ ============== =========================================================================================== Type Stationary interface (6dof) Topologies Peripheral face of the source gear Location Center of the source gear u direction Axial, along the axis of rotation of the source gear v direction Aligned with the v-direction of the target gear w direction Resulting direction ============== =========================================================================================== ^^^^^^^^^^^^^^^^^^^^ Target interface ^^^^^^^^^^^^^^^^^^^^ ============== =========================================================================================== Type Stationary interface (6dof) Topologies Peripheral face of the target gear Location Center of the target gear u direction Axial, along the axis of rotation of the target gear v direction Aligned with the v-direction of the source gear, pointing from the target to the source gear w direction Parallel to the w-direction of the source gear ============== =========================================================================================== ^^^^^^^^^^^^^^^^^^^^^^^^^ Recommended link settings ^^^^^^^^^^^^^^^^^^^^^^^^^ ========================== ========================== Use ground for source unchecked Location master none Orientation master either source or target ========================== ========================== ---------- Parameters ---------- ========================== ========= =========== ============================================================================== Parameter Unit Symbol Description ========================== ========= =========== ============================================================================== Source gear radius m :math:`r_S` Radius of the pitch line of the source gear Target gear radius m :math:`r_T` Radius of the pitch line of the target gear Contact stiffness N/m :math:`k` Stiffness of the contact between the gears including tooth compliance Contact viscous damping Ns/m :math:`d_v` Viscous damping of the contact between the gears including tooth compliance Contact hysteretic damping None :math:`d_h` Hysteretic damping of the contact between the gears including tooth compliance ========================== ========= =========== ==============================================================================