# Design and Mechanics of Cable-Driven Rolling Diaphragm Transmission for High-Transparency Robotic Motion

## TL;DR

This paper introduces a novel cable-driven rolling diaphragm transmission with electronic control, enhancing reliability and scalability for high-precision robotic applications by addressing tension maintenance and system stiffness.

## Contribution

It proposes a new coaxial layout with force balancing and tension control, along with automation procedures and experimental validation for improved robotic transmission performance.

## Key findings

- Successful prototype demonstrating high stiffness and reliable tension control
- Effective force balancing reduces bearing loads and enhances system durability
- Automation procedures streamline setup and operation processes

## Abstract

Applications of rolling diaphragm transmissions for medical and teleoperated robotics are of great interest, due to the low friction of rolling diaphragms combined with the power density and stiffness of hydraulic transmissions. However, the stiffness-enabling pressure preloads can form a tradeoff against bearing loading in some rolling diaphragm layouts, and transmission setup can be difficult. Utilization of cable drives compliment the rolling diaphragm transmission's advantages, but maintaining cable tension is crucial for optimal and consistent performance. In this paper, a coaxial opposed rolling diaphragm layout with cable drive and an electronic transmission control system are investigated, with a focus on system reliability and scalability. Mechanical features are proposed which enable force balancing, decoupling of transmission pressure from bearing loads, and maintenance of cable tension. Key considerations and procedures for automation of transmission setup, phasing, and operation are also presented. We also present an analysis of system stiffness to identify key compliance contributors, and conduct experiments to validate prototype design performance.