39. Low_torque_transmission Design

Ready-to-use parametric low-torque-transmission design. It is a reduction system based on a train of epicyclic-gearing. The design includes the electric-motor holder for a cylindric or square format. The output is an hexagon on which you can plug a gearwheel. It is a variant of Epicyclic Gearing Design

low_torque_transmission design characteristics:

To get an overview of the possible low_torque_transmission designs that can be generated by low_torque_transmission(), run:

> python low_torque_transmission.py --run_self_test

39.1. Low_torque_transmission Parameters

39.1.1. Overview

The Low_torque_transmission is composed of the following parts


The low_torque_transmission inherits the parameters from the Gearring Design. The parameter epicyclic_step_nb sets the number of epicyclic-steps.

39.1.2. z-direction parameters

The parameters related to the extrusion size in the z-direction:

_images/ltt_epicyclic_step_width.png _images/ltt_motor_side_width.png _images/ltt_output_side_width.png

39.1.3. Sun and planet parameters

_images/ltt_sun_parameters.png _images/ltt_planet_parameters.png

39.1.4. Planet-carrier parameters

_images/ltt_planet_carrier_rear.png _images/ltt_planet_carrier_middle.png _images/ltt_planet_carrier_front.png

39.2. Low_torque_transmission Parameter Dependency

39.2.1. hexagon_width

The output_hexagon must into the output_holder. But also the output_front_planet_carrier_width must be inside the output-cover to guarantee enough slack between the *output_planet and the output_cover. So we get the relations:

output_cover_width + hexagon_width > output_holder_width
hexagon_width < output_holder_width

39.2.2. input_slack

The input_slack parameter sets some play between the motor_holder and the first rear_planet_carrier. Notice that this value is affected by the length of the output axle.