Run-flat Device Axial Belt Segmentation Manual Mounting
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Solution Overview
Problem
Existing run-flat devices for multi-block rims are difficult to mount manually and do not effectively lock the beads of the tire cover against the rim flanges, limiting their ability to maintain performance during a drop in inflation pressure, especially on uneven terrain.
Innovation Solution
A run-flat device featuring an annular supporting structure with an axial belt and removable connecting means that allows manual mounting by splitting radially, along with locking means that include lateral protrusions to secure the beads against the rim flanges, providing a 'beadlock' effect and enhancing centrifugal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the run-flat device uses a complete annular supporting structure, then the structural strength and bead-locking capability are improved, but the device cannot be mounted manually inside the cover
Solution Approach 1:
The annular supporting structure is divided into multiple separable sectors that can be inserted into the cover individually or in small groups. Each sector maintains the necessary structural strength while the segmented configuration allows manual insertion through the open end of the cover, eliminating the need for complex mounting tools or procedures
2Ease of operation
If the run-flat device uses a split structure for manual mounting, then the ease of operation is improved, but the structural integrity and centrifugal resistance are reduced
Solution Approach 1:
The sectors are pre-formed with precise geometric features including locking surfaces and connection interfaces that ensure proper alignment and structural integrity when assembled. The preliminary preparation of these features allows the sectors to be manually inserted and then securely locked together, maintaining structural integrity without requiring complex assembly tools
Solution Approach 2:
The sectors are designed to nest together within the cover, with each sector fitting into the space defined by its neighbors. This nesting arrangement allows the complete annular structure to be assembled from smaller components that can pass through the cover opening, while the nested configuration maintains the overall structural integrity needed for centrifugal resistance
3Device complexity
If the locking means are separate from the supporting structure, then the device complexity is reduced, but the bead-locking effectiveness is reduced
Solution Approach 1:
The locking means are integrated as an inherent feature of the supporting structure sectors rather than being separate components. Each sector includes built-in locking surfaces and engagement features that directly interact with the tire bead and rim flange, eliminating the need for additional separate locking mechanisms while maintaining effective bead-locking capability
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
Enables the device to be mounted manually and maintain tire integrity and bead locking during high-speed travel over varied terrain, including sandy surfaces, by allowing adjustment and balancing to minimize out-of-balance issues.
Implementation Method 1
removable connecting means for fastening the belt, said supporting structure being split right through radially in line with said or each gap so as to allow the device to be mounted manually inside the cover
Implementation Method 2
locking means for locking the beads against the rim flanges and which are intended to connect the annular supporting structure to the beads
Implementation Method 3
the belt of the run-flat device according to the invention is advantageously designed both to confer upon the supporting structure incorporating it satisfactory ability to withstand the centrifugal effects encountered during driving
Data Source
AI summary
The present invention relates to a run-flat device for attaching a tubeless mounted assembly for a motor vehicle, and to such a mounted assembly incorporating said device. A device (30) according to the invention includes: a tire support structure (30), to be mounted around a rim having a plurality of pieces and comprising a reinforcing frame, and a bead lock means for locking the beads against the rim edge and connecting the support structure to the beads. According to the invention, the frame comprises an axial belt having at least one pair of ends opposite each other, separated by a connecting axial interstice, and connected therebetween by detachable connecting means (35, 36) for locking the belt, the support structure being radially split on both sides on the right of each interstice to enable the manual mounting of the device inside the casing by the gradual insertion therein of the structure, temporarily free of the connecting means.