Tyre Valve Recesses for Sealing Ring Expansion

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Solution Overview

Problem

Existing tire valves face challenges in accommodating manufacturing tolerances and thermal expansion of sealing rings, leading to potential damage and reduced sealing efficiency due to precise volume matching requirements between the sealing ring and the annular groove.

Innovation Solution

Incorporating recesses in the radially outer boundary wall of the annular groove that allow the sealing ring to expand, with recesses that narrow radially outwards and are open towards the air inlet, enabling easier material expansion and reducing mechanical stress, while also allowing for flexible selection of recess dimensions and number.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the annular groove volume is precisely matched to the sealing ring volume, then sealing reliability is improved, but manufacturing complexity and cost increase due to precise dimensional control requirements

Engineering Contradiction:

Improvesealing reliabilityVSAvoidvolume matching precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The invention changes the geometric parameters of the annular groove by adding recesses to its boundary wall, transforming it from a simple cylindrical groove to a groove with expanded capacity zones. This parameter change allows the groove to accommodate volume variations of the sealing ring without requiring precise volume matching, thereby resolving the contradiction between sealing reliability and manufacturing precision requirements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The boundary wall of the annular groove is segmented by introducing recesses that create distinct zones: a primary sealing zone and expansion zones. This segmentation allows different portions of the groove to serve different functions - the main groove provides sealing while the recesses absorb excess volume, eliminating the need for precise overall volume matching

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the sealing ring volume is greater than the annular groove volume, then thermal expansion and manufacturing tolerances are accommodated, but the sealing ring may be damaged due to excessive mechanical stress

Engineering Contradiction:

Improveaccommodation of thermal expansion and tolerancesVSAvoidsealing ring integrity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The recesses in the boundary wall act as pre-designed cushioning zones that absorb excess sealing ring material before it can generate damaging stresses. By providing this cushioning capacity in advance, the invention allows the sealing ring to accommodate thermal expansion and manufacturing tolerances while protecting the sealing ring from damage

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The invention modifies the groove geometry by adding recesses, changing the volume distribution within the groove. This creates additional capacity that can absorb the excess volume from thermal expansion and tolerances without transmitting damaging stresses to the sealing ring, thus preserving sealing ring integrity

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the annular groove volume is increased to accommodate sealing ring expansion, then adaptability is improved, but the groove becomes too large requiring precise matching

Engineering Contradiction:

Improvesealing ring volume accommodationVSAvoidgroove volume control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Instead of creating one large homogeneous groove, the invention segments the groove volume into a primary sealing portion and separate recess portions. This segmentation allows the main groove to maintain precise dimensions for reliable sealing while the recesses provide additional capacity for volume accommodation without requiring the entire groove to be precisely controlled

Inventive Principle:

Principle #1Segmentation

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 design enhances sealing efficiency and durability by absorbing excess volume and reducing mechanical stress on the sealing ring, facilitating easier assembly and maintaining reliable sealing without the need for precise volume matching, thus improving cost-effectiveness.

Implementation Method 1

The excess volume of the sealing ring can be based, for example, on manufacturing tolerances or as a result of thermal expansion.

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

Material of the sealing ring can expand into the recess(es) when the sealing ring is pressed between the rim and the tire valve.

Methodology Applied

Scientific EffectElastic deformation: Deformation

Data Source

PatentEP3668727B1Tyre valve

Publication Date: 2021.06.16 HUF BAOLONG ELECTRONICS BRETTEN GMBH

Figure 1~2
Figure 3~4

AI summary

The invention relates to a tyre valve for mounting on a rim (12), having an air channel (2), which leads from an air inlet (3) to an air outlet (4), and an annular groove (6) that is open in the direction of the air inlet (3) in order to receive a sealing ring (8). According to the invention, a radially outer boundary wall (9) of the annular groove (6) has at least one cut-out (10).