Tubeless Wheel Valve Base and Sleeve for Cannula Access
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Solution Overview
Problem
Existing valve systems for tubeless wheels face difficulties in inserting or removing sealing fluid due to obstructions caused by puncture protection inserts, which can block the valve system and hinder the filling or extraction of sealing liquid, especially when the inserts' openings are not aligned with the valve system.
Innovation Solution
A valve system design featuring a valve base with a continuously increasing outer circumference along the valve axis, forming a thickened end that engages with the rim and a sleeve extending into the tire/rim volume, allowing for a stable and unobstructed passage for a cannula or hollow needle through the puncture protection insert, ensuring correct positioning and preventing mechanical blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a puncture protection insert is integrated into the tire/rim volume to improve stability and protection against pinch punctures, then the protection against punctures is improved, but the valve system becomes obstructed and the filling or extraction of sealing liquid becomes difficult
Solution Approach 1:
The puncture protection insert is segmented with a through-opening that separates the insert into two parts, creating a passage through the insert. This segmentation allows the cannula to pass through the insert while the insert maintains its puncture protection function in other areas.
Solution Approach 2:
A through-opening is extracted from the puncture protection insert, creating a dedicated passage. This removes the obstruction problem by providing a clear path for the cannula to reach the valve system, while the remaining structure of the insert continues to provide puncture protection.
2Ease of operation
If the puncture protection insert is made with openings or gaps to reduce weight and allow cannula passage, then the ease of operation is improved, but the insert may be displaced in azimuthal or rolling direction and block the valve system
Solution Approach 1:
The sleeve is nested within the through-opening of the puncture protection insert, with the outer circumference of the sleeve engaging the inner circumference of the opening. This nesting arrangement stabilizes the insert's position while maintaining the passage for the cannula.
Solution Approach 2:
The sleeve acts as an intermediary element between the puncture protection insert and the cannula. It provides a stable guide structure that maintains the opening's position and prevents the insert from displacing, while still allowing the cannula to pass through.
3Stability of the object's composition
If the valve base is designed with a continuously increasing outer circumference forming a thickened end, then the engagement with the rim is stabilized, but the device complexity increases
Solution Approach 1:
The valve base features a dynamically varying cross-section with a continuously increasing outer circumference that forms a thickened end. This dynamic geometry provides enhanced engagement stability with the rim while the increase in thickness is localized only where needed for engagement, rather than throughout the entire structure.
Data Source
AI summary
The invention relates to a valve system (6, 62, 64, 66) for a tubeless wheel, the wheel comprising a rim (1) and a tire (2), which form a tire/rim volume (10) that can be filled with air, and a puncture protection insert (5, 52, 54, 55, 56) positioned inside the tire/rim volume (10), the valve system comprising a valve stem body (82, 84, 86), which extends along a valve axis (A) and has a first end and a second end, and a valve base (72, 73, 74, 75, 76) adjoining said second end, the second end being positioned in the tire/rim volume (10) when the valve system (6, 62, 64, 66) is mounted on the wheel. The purpose of this is to simplify the insertion of a tube-like cannula or hollow needle of a tool for filling or extracting sealing fluid through the valve system into the tire/rim volume. According to the invention, this is achieved in that the valve base has an outer circumference that increases continuously along the valve axis (A) in the direction of the tire/rim volume, forming a thickened valve base end, and the valve system (6, 62, 64, 66) also comprises a sleeve (4, 42, 43, 44, 45, 46) having a first end and a second end, wherein the first end of the sleeve (4, 42, 43, 44, 45, 46) connects to the thickened valve base end (72, 73, 74, 75, 76) and the sleeve (4, 42, 43, 44, 45, 46) extends from there along the valve axis in a direction oriented away from the valve stem body (82, 84, 86).