Ball-Caster Drive Layout for Tip-Resistant Tall Robots
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Solution Overview
Problem
Autonomous mobile robots, especially tall ones, are prone to tipping over due to their high center of gravity, which can be caused by obstacles or intentional tipping, affecting their operational stability and functionality.
Innovation Solution
A stabilizing drive system incorporating ball casters positioned at the corners of the robot base, in addition to drive wheels, to lower the center of gravity and enhance stability, allowing the robot to navigate over and around obstacles without tipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the robot is made taller to improve sensing distance and obstacle detection, then the robot's ability to see and sense obstacles is improved, but the robot becomes more prone to tipping over
Solution Approach 1:
The patent applies counterweight by adding ball casters at the corners of the robot base that extend below the main body. These ball casters act as counterbalancing elements that lower the center of gravity and provide stability against tipping forces. The ball casters function as passive counterweights that automatically adjust to maintain balance when the robot encounters obstacles or is pushed, directly resolving the contradiction between height and stability.
2Illumination intensity
If the robot is made taller to improve obstacle detection, then the robot's sensing capability is improved, but the robot is easier to tip over when striking obstacles
Solution Approach 1:
The ball casters serve as counterbalancing elements that prevent the robot from tipping when it strikes obstacles. The extended mass below the main body creates a stable base that absorbs impact forces and prevents catastrophic failures, thereby improving operational reliability while maintaining the tall sensing platform.
Solution Approach 2:
The ball casters provide beforehand cushioning by being positioned to contact the ground first when the robot encounters obstacles. This pre-contact mechanism cushions impacts before they can transfer to the main body and cause tipping, protecting the robot's operational integrity.
3Illumination intensity
If the robot is made taller to improve sensing capability, then the robot's detection range is improved, but the robot is more susceptible to tripping over floor-level objects
Solution Approach 1:
The ball casters extend below the main robot body and act as counterbalancing elements that lower the center of gravity. When the robot encounters floor-level obstacles, the ball casters contact the ground first and prevent the robot from tripping, as the extended mass provides a stable base that resists rotational forces from obstacles.
4Stability of the object's composition
If ball casters are added to stabilize the robot, then the robot's stability is improved, but the device complexity increases
Solution Approach 1:
The ball casters are designed as passive, self-service stabilizing elements that automatically adjust to maintain balance without requiring active control systems. The ball-bearing mechanism self-adjusts to surface irregularities and tipping forces, providing stability through passive mechanical means rather than complex active control, thereby minimizing the increase in device 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
The system provides enhanced stability, enabling tall robots to tilt up to 45° without falling, and maintain stability with at least two ball casters in contact with the floor, improving navigation and obstacle avoidance.
Implementation Method 1
the ball caster are positioned relative to the robot base and to the at least two drive wheels so as to lower a center of gravity of the robot
Implementation Method 2
provide stabilization of the driving
Data Source
AI summary
An apparatus, system and method capable of providing a stabilizing drive system for a robotic vehicle. The apparatus, system and method may include at least a robot body base; at least two drive wheels within the robot body base; a processing system having non-transitory computing code associated therewith which, when executed by the processing system, causes to be driven the at least two drive wheels; and a plurality of ball casters within the robot body base, wherein the ball caster are positioned relative to the robot base and to the at least two drive wheels so as to lower a center of gravity of the robot and provide stabilization of the driving.