Tyre Inflation Valve Guard Means for Universal Rim Compatibility
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Solution Overview
Problem
Existing tyre in tyre systems for agricultural tractors are expensive and require non-standard wheel rims, limiting their cost-effectiveness and versatility in quickly changing between field and road pressures.
Innovation Solution
A wheel with a tyre in tyre system featuring a second inflation valve with guard means, including radially extending bores or formations, ensures air can enter and leave the ground engaging tyre through an inner end, using a separate head portion and nut for secure sealing, allowing for efficient pressure adjustments without the need for non-standard rims.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tyre in tyre system is implemented to enable quick pressure changes between field and road work, then the productivity and operational efficiency is improved, but the cost of implementation increases due to requiring non-standard wheel rims
Solution Approach 1:
The invention makes the wheel rim universal by enabling it to accommodate both standard inflation valves and tyre in tyre systems. The rim is designed with a valve hole that can receive either a standard inflation valve or a specialised tyre in tyre valve assembly, allowing the same rim to serve multiple functions and be used in different configurations without requiring custom rims for each application.
Solution Approach 2:
The invention implements a nested structure where the inner inflatable member is placed inside the outer ground engaging tyre, both mounted on the same rim. The inner inflatable member is positioned within the tyre well of the rim, while the outer tyre surrounds it, creating a nested arrangement that allows independent pressure control of each layer while sharing the same mounting structure.
2Ease of operation
If a second inflation valve is added to control the outer tyre pressure separately, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The invention merges the functions of multiple valves into a single integrated valve assembly. The first inflation valve is designed to control both the inner inflatable member and the outer ground engaging tyre simultaneously through shared air passages. This combining of functions reduces the total number of separate valves needed while maintaining the ability to independently control pressures in both tyre layers.
Solution Approach 2:
The valve assembly is segmented into distinct functional zones with separate air passages - one passage leading to the inner inflatable member and another to the outer tyre. This segmentation allows independent pressure control of each tyre layer through a single valve body, reducing operational complexity while maintaining functionality.
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
This solution enables cost-effective and efficient pressure changes between field and road work conditions by ensuring reliable air flow through the tyre system, reducing the volume of air needed to be pumped or vented, and maintaining operational safety and economy.
Implementation Method 1
the head portion or separate head portion of the inflation valve may be dome shaped... the head portion including the radially extending bores or formations which communicate with the axially extending internal bore
Implementation Method 2
the valve support body is held within the valve hole by a nut which engages a thread on the exterior of the support body and is sealed to the rim by the separate head portion clamped to the rim by the nut... The valve support body may include a sealing groove for snap-in sealing engagement with the valve hole
Data Source
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AI summary
A wheel (10) is provided with a tyre in tyre installation in which an outer ground engaging tyre (13) is mounted on a rim (11) of the wheel and an inner inflatable member (14) is mounted on the rim inside the outer tyre. The wheel rim has a first inflation means (15) mounted on the rim to introduce air into and release air from the inner inflatable member, and a second inflation means (16) mounted on the rim for introducing air into and releasing air from the interior of the ground engaging tyre (13) external to the inner inflatable member (14). The second inflation means (16) is provided with guard means (40) to ensure that air can at all times enter and leave the interior of the ground engaging tyre via an inner end of the second inflation means (16). The guard means including one or more radially extending bores or formations formed in the inner end of the second inflation means or a component mounted thereon through which air can enter or leave the ground engaging tyre.