Elastic Running Wheel Profile Blocks for Robot Vacuum Obstacle Grip
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Solution Overview
Problem
Automatically traveling floor dust collecting appliances struggle to effectively navigate obstacles due to limited traction and stability, especially when encountering edges or steps, as existing designs do not provide sufficient grip or contact area.
Innovation Solution
The design incorporates profile blocks within the tire contact area that slope downward toward the center, forming a protruding portion which, when loaded, flattens to create a larger contact surface, enhancing grip and stability. These profile blocks are made of elastic material, allowing for deformation and increased traction on obstacles, and are strategically offset to optimize contact with the floor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tire contact area design is used, then the structure is simple, but the traction and stability when encountering obstacles are insufficient
Solution Approach 1:
The tire contact area is segmented into multiple profile blocks arranged in the peripheral direction. Each profile block is a separate structural element that can independently interact with obstacles, providing distributed traction points and improving overall reliability when encountering edges or steps.
Solution Approach 2:
The profile blocks are designed with specific local geometric characteristics - sloping downward toward the center in cross-section and forming farthest protruding portions at transitions to side faces. This local quality optimization enhances grip and stability at critical contact points without requiring complete redesign of the entire tire structure.
2Reliability
If the tire contact area is increased to improve stability, then the contact surface with the floor is larger, but the ability to grip obstacles such as edges or steps is reduced
Solution Approach 1:
The profile blocks feature curved or sloping surfaces rather than flat contacts. The downward slope toward the center and the rounded protruding portions create geometric shapes that can roll over or dig into obstacles like edges and steps, converting the contact geometry to enhance gripping capability while maintaining reasonable contact area.
Solution Approach 2:
The elastic material parameter is utilized to allow dynamic deformation of the profile blocks. When loaded during obstacle interaction, the profile blocks flatten and deform to increase contact surface area with the obstacle, providing adaptive grip that responds to varying obstacle conditions without requiring a permanently larger tire contact area.
3Area of stationary object
If the profile block is made rigid to maintain structural integrity, then the shape is stable, but the contact surface area with the floor is reduced due to lack of deformation
Solution Approach 1:
The material parameter of the profile blocks is selected as elastic rather than rigid. This allows the profile blocks to deform under load, flattening during contact to maximize the contact surface area with the floor and obstacles, while still maintaining sufficient structural integrity to support the appliance weight and transmit forces effectively.
Solution Approach 2:
The tire is constructed using elastic material that combines the properties of flexibility for deformation with sufficient strength for structural support. This composite characteristic allows the profile blocks to both deform for increased contact area and maintain integrity for force transmission, resolving the contradiction between softness and strength.
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 solution provides improved traction and stability by creating a larger contact surface area with obstacles, allowing the appliance to navigate edges and steps effectively, ensuring stable travel and efficient dust collection.
Implementation Method 1
the tire, which comprises elastic material, having profile blocks... when such a profile block contacts the floor this results in a flattening of the profile, and thus a larger contact surface, due to the load which customarily acts
Data Source
AI summary
An automatically traveling floor dust collecting appliance has at least one running wheel having an axis of rotation, a hub, and a tire forming a tire contact area merging radially inwardly into two oppositely situated side faces. The tire, which includes elastic material, has profile blocks, each forming a part of the tire contact area and provided one after the other in the peripheral direction. A running wheel is also provided, in particular for a floor dust collecting appliance. The part of the tire contact area formed by a profile block has a profile which in its cross-section slopes downwardly toward the center. This profile block at the same time forms a part of an associated side face. The profile block, at this transition, radially and in the direction of the axis of rotation, forms a farthest protruding portion of the tire contact area of the tire.