Valve Stem Clog Prevention with Tubular Extension
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Solution Overview
Problem
Valve stems in pneumatic tires often clog when tire sealants or other additives are introduced, leading to issues with air pressure maintenance and tire inflation, resulting in improper wear, handling hazards, and decreased fuel efficiency.
Innovation Solution
A valve stem design featuring an axial airway with a tubular extension and a clog-preventing member that extends from the output port, effectively blocking particulate material from entering and clogging the airway, ensuring airflow remains unobstructed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve stem is used to deliver air to the tire, then air pressure can be maintained, but the valve stem clogs when sealant material is introduced
Solution Approach 1:
The valve stem air passage is segmented into multiple sections: the main axial air passage, the tubular extension, and the clog-preventing member with its own air passage. This segmentation allows the clog-preventing member to act as a separate protective element that filters particulate material while maintaining air flow through the segmented passages.
Solution Approach 2:
The clog-preventing member acts as an intermediary element between the sealant injection point and the main air passage. It includes a surface to block particulate material and an air passage that allows air to pass through, serving as a mediator that prevents harmful particles from entering the main valve stem while still allowing air flow.
2Reliability
If sealant material is injected through the valve stem, then tire punctures can be sealed, but the valve stem becomes clogged
Solution Approach 1:
The clog-preventing member is pre-installed in the valve stem before sealant injection. Its air passage and blocking surface are already in position to prevent particulate material from clogging the main air passage during the sealant injection process, performing the protective function in advance.
Solution Approach 2:
The clog-preventing member serves as an intermediary that allows sealant material to pass through while blocking harmful particulate material. Its air passage permits the sealant to reach the tire interior, while its blocking surface intercepts particulate material that would otherwise clog the main valve stem.
3Ease of operation
If the valve stem air passage is blocked, then air flow is prevented, but the tire cannot be properly inflated
Solution Approach 1:
The clog-preventing member acts as an intermediary that maintains air passage patency by blocking particulate material while allowing air to pass through its air passage. This ensures the main air passage remains clear for proper tire inflation operations.
Solution Approach 2:
The clog-preventing member provides self-service protection by automatically blocking particulate material that enters the valve stem. Its blocking surface and air passage configuration allow it to self-regulate the flow, permitting air while preventing clogging without external intervention.
Data Source
AI summary
The present invention provides a tire valve stem assembly for a pneumatic tire having a valve stem for inflating the tire and having a member extending from the valve stem into an interior of the tire to prevent clogging or minimize clogging of the valve stem by leak sealing material.