Integrated Tire Valve Insert for Capless Dirt Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire valves, particularly Schrader valves, suffer from design complexities leading to high manufacturing costs, susceptibility to notch effects, and issues with dirt and foreign matter accumulation, which can impair functionality and require a valve cap for sealing.
Innovation Solution
A tire valve design featuring a valve stem with a valve insert that includes a check valve and a spring-loaded tappet, eliminating the need for a valve cap by integrating the check valve within the stem, and utilizing a taper or radially inner projection to secure the insert, providing a compact, cost-effective, and sealed housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a valve cap is added to prevent dirt accumulation, then protection against foreign matter is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the sealing function from the separate valve cap component and integrates it directly into the valve stem through the tappet mechanism. The tappet creates a sealed closure at the air inlet end, eliminating the need for an external valve cap while maintaining protection against dirt and foreign matter accumulation.
Solution Approach 2:
The invention merges the sealing function previously performed by the valve cap with the valve stem structure itself. The tappet, integrated into the valve stem, performs both the sealing and closure functions that were previously distributed between the stem and cap, reducing overall device complexity.
2Adaptability or versatility
If multiple threads are provided on the valve stem for valve core and valve cap, then functionality is improved, but notch effects and structural weakness increase
Solution Approach 1:
The invention extracts the sealing function from the valve cap thread interface and relocates it to the tappet mechanism integrated in the valve stem. This eliminates the need for one of the two threads (the external thread for the valve cap), reducing the notch effect while maintaining the internal thread for the valve core functionality.
3Device complexity
If a valve cap is removed to simplify structure, then device complexity is reduced, but sealing reliability deteriorates
Solution Approach 1:
The tappet mechanism is designed to automatically seal the air inlet end of the valve stem when the valve core closes. The spring-loaded tappet is pressed against the inlet end by spring force, creating a self-sealing mechanism that maintains sealing reliability without requiring an external valve cap.
4Ease of manufacture
If check valve is integrated into valve stem, then manufacturing cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention nests the valve insert containing the check valve mechanism directly within the valve stem structure. The valve insert is positioned and secured within the stem, allowing for integrated manufacturing or assembly that reduces overall component count and manufacturing cost while managing precision requirements through the nesting arrangement.
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 design prevents dirt ingress, reduces manufacturing complexity and costs, ensures reliable sealing without a cap, and avoids notch effects, while maintaining efficient air flow and easy installation.
Implementation Method 1
a compression spring which presses the tappet in a spring-loaded manner against the radially inner projection or the taper
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a tire valve with a valve stem and a valve insert inserted into the valve stem, wherein the valve stem and the valve insert enclose an air passage which extends in an axial direction from an air inlet end at a first axial end of the valve stem to an air outlet end at a second axial end of the valve stem; and the valve insert comprises an outer sleeve which encloses the air passage and in which a check valve with a valve body and a valve seat is arranged in the air passage, wherein the valve stem has a taper and/or a radially inner projection at the air inlet end, against which a tappet arranged in the air passage in addition to the check valve rests in a spring-biased manner.The tire valve according to the invention is characterized in that the valve stem is designed in one piece and the valve insert is arranged completely within the one-piece valve stem and is completely enclosed by it.