Friction Drive System Reduces Backlash in Robotic Wheels
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Solution Overview
Problem
Robotic systems with large wheels face increased backlash due to the need for gear reduction, which compromises balance when traversing obstacles, especially in environments with varying terrain.
Innovation Solution
A drive system utilizing a frictional engagement between a motor's rotatable component and the wheel's contact surface, allowing direct torque transmission with minimal backlash, enabling larger wheels without the need for excessive gear reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional gear reduction is used to drive large wheels, then the wheel size increases for better obstacle traversal, but backlash increases compromising balance
Solution Approach 1:
The patent replaces the traditional mechanical gear reduction system with a direct-drive configuration where the motor rotates the wheel without intermediate gears. This substitution eliminates gear backlash while maintaining the ability to drive large wheels, directly resolving the contradiction between wheel size and backlash.
2Force
If gear reduction is increased for larger wheels, then torque is amplified, but the complexity of the transmission system increases
Solution Approach 1:
The patent extracts and removes the gear reduction mechanism from the transmission system, adopting a direct-drive approach. This elimination of intermediate components simplifies the transmission system while maintaining torque delivery through direct motor-to-wheel coupling, resolving the contradiction between torque and system complexity.
Solution Approach 2:
The patent replaces the complex mechanical gear transmission system with a simplified direct-drive mechanical system. This substitution eliminates multiple gear stages and associated components, reducing transmission system complexity while maintaining adequate torque for wheel propulsion.
3Power
If traditional gear reduction is used, then the motor can be smaller, but the overall device complexity increases
Solution Approach 1:
The patent extracts the gear reduction mechanism from the drive system, resulting in a direct-drive configuration. This removal eliminates the need for complex gear trains while allowing the use of a appropriately sized motor, resolving the contradiction between motor size and drive system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides a robotic system with high torque at low speeds, maintaining balance and navigating through obstacles with little to no backlash, enhancing its operational efficiency and adaptability.
Implementation Method 1
the rotatable component is frictionally engaged with the contact surface such that a rotation of the rotatable component about the respective second axis is translated to a rotation of the wheel about the first axis
Data Source
AI summary
An example implementation includes a robotic system including a first wheel and a second wheel configured to rotate about a first axis. Each wheel of the first wheel and the second wheel includes a contact surface and a motor coupled to a rotatable component. Each motor is configured to rotate the rotatable component about a respective second axis. The rotatable component is frictionally engaged with the contact surface such that a rotation of the rotatable component about the respective second axis is translated to a rotation of the wheel about the first axis. The robotic system further includes a controller configured to operate the motor of the first wheel and the motor of the second wheel in order to cause the robotic system to maintain its balance and navigate within an environment based on data received from one or more sensors.