Roller Assembly with Elastomer Layer for Robot Collision Protection
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Solution Overview
Problem
Autonomous mobile robots face challenges in collision protection and stability, particularly when operating at high speeds and navigating uneven terrain, as existing solutions fail to provide adequate cushioning against impacts and maintain low resistance to movement.
Innovation Solution
A roller assembly featuring a rotating metal shaft supported by bearings, covered by an impact-absorbing elastomer layer and a low-friction outer shell, which allows for deformation under impact and reduces stiffness, providing both stability and low sliding friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid protective structure is used for collision protection, then protection capability is improved, but resistance to movement increases
Solution Approach 1:
The patent applies a flexible elastomer layer as the outer shell of the roller assembly. This elastomer layer deforms under impact forces to absorb collision energy while maintaining flexibility that allows easy rolling motion. The flexible material provides both protection capability and low resistance to movement, resolving the contradiction between rigid protection and ease of operation.
Solution Approach 2:
The patent changes the material parameters of the roller assembly by using elastomers with specific durometer values (e.g., 60-90 Shore A) that balance protection and mobility. The elastomer layer thickness and hardness are optimized to provide adequate collision protection while maintaining low friction and easy rolling, thus resolving the contradiction between strength and ease of operation.
2Strength
If a soft impact-absorbing material is used, then collision protection is improved, but friction increases
Solution Approach 1:
The elastomer layer serves as a flexible shell that absorbs impacts while the smooth outer surface of this flexible layer maintains low sliding friction. The flexible material properties allow it to deform during impact yet slide easily over surfaces during normal operation, resolving the contradiction between impact absorption and friction.
Solution Approach 2:
The roller assembly uses a composite structure combining the elastomer layer with the underlying roller mechanism. The elastomer provides impact absorption while its surface characteristics provide low friction, creating a composite solution that resolves the contradiction between soft material benefits and friction concerns.
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 roller assembly effectively cushions against collisions, maintains stability and low resistance to movement, and allows for easy turning, reducing the risk of damage from impacts and terrain irregularities while enabling efficient operation in various environments.
Implementation Method 1
allows for deformation under impact and reduces stiffness
Implementation Method 2
impact-absorbing elastomer layer
Implementation Method 3
having a lower coefficient of friction than the impact absorbing layer for providing low sliding friction
Implementation Method 4
shaft has opposite ends configured to be supported by bearings in the robot
Data Source
AI summary
A roller assembly provides collision protection and stability to a mobile robot. The roller assembly includes a shaft forming an axis about which the roller assembly can rotate. The shaft has opposite ends configured to be supported by bearings in the robot. The roller assembly also includes an impact absorbing layer coaxially covering the shaft. It further includes a shell coaxially covering the impact absorbing layer having a lower coefficient of friction than the impact absorbing layer for providing low sliding friction.