Reconfigurable Differential Drive for Sideways Robot Motion
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Solution Overview
Problem
Conventional differential-drive systems in mobile robots lack the ability to perform sideways movement efficiently, requiring complex and costly arrangements with multiple actuators, which are difficult to control and less robust, especially in confined spaces.
Innovation Solution
A selectively reconfigurable drive assembly with two wheels and a single steering actuator that allows synchronous reconfiguration of wheel rotations around pivot axes, enabling sideways and circular movements without differing angular velocities, and includes a fault-tolerant mechanism for continued operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional differential-drive systems are used, then the mechanical structure is simple, but the robot cannot drive sideways and requires complex hybrid maneuvers
Solution Approach 1:
The patent implements dynamic reconfiguration of the differential-drive system by enabling the rotation axes to change their relative orientation. The system can switch between a parallel configuration (for conventional differential movement) and a perpendicular configuration (for sideways movement), allowing the robot to adapt its movement capabilities to different operational requirements without adding complex steering mechanisms
Solution Approach 2:
The reconfigurable differential-drive system serves multiple functions: it can perform conventional differential movement when axes are parallel, sideways movement when axes are perpendicular, and transitional movements during reconfiguration. This multi-functionality eliminates the need for separate steering mechanisms while expanding movement capabilities
2Adaptability or versatility
If multiple actuators and independent wheel steering are used to enable sideways movement, then the robot can drive sideways, but the drive arrangement becomes complex and costly
Solution Approach 1:
The patent combines the functions of multiple independent wheel actuators into a single reconfigurable differential-drive system. By merging the steering and drive functions into one integrated mechanism that can reconfigure its axis orientation, the system achieves sideways movement capability without requiring multiple separate actuators, thereby reducing complexity and cost
Solution Approach 2:
The system uses dynamic reconfiguration of the rotation axes to achieve sideways movement. Instead of using multiple actuators to independently steer each wheel, the system dynamically changes the relative orientation of the rotation axes between parallel and perpendicular positions, enabling versatile movement with a single actuator system
3Adaptability or versatility
If independent wheel steering mechanisms are implemented, then sideways movement is enabled, but the control difficulty increases
Solution Approach 1:
The reconfigurable differential-drive system provides a unified control interface for multiple movement modes. A single control system manages both conventional differential movement and sideways movement by controlling the axis reconfiguration, eliminating the need for complex independent control of multiple actuators and simplifying the overall control difficulty
4Adaptability or versatility
If multiple actuators and stability mechanisms are used, then sideways movement is possible, but the robustness during operation decreases
Solution Approach 1:
The patent merges multiple actuator functions into a single robust differential-drive mechanism. By combining the steering and drive functions into one integrated system with fewer moving parts, the design reduces potential failure points and improves operational robustness while maintaining sideways movement capability
Data Source
AI summary
There is provided a drive assembly comprising: a reconfigurable differential drive comprising a first wheel and a second wheel, wherein the first and second wheels are moveable with different angular velocities around respective first and second rotation axes; a steering actuator configured to rotate the first wheel around a first pivot axis and/or the second wheel around a second pivot axis; wherein the first and second wheels are coupled such that a rotation of the first wheel around the first pivot axis by a first adjustment angle results in a rotation of the second wheel around the second pivot axis by a second adjustment angle, the second adjustment angle being dependent on the first adjustment angle.