Wire Mesh Puck Retention for Vibration-Resistant Exhaust Mixing

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Solution Overview

Problem

Existing exhaust treatment systems in vehicles with diesel engines face challenges in achieving a uniform mixture of exhaust gases and reactants, such as urea, which affects the efficiency of aftertreatment devices like selective catalytic reduction catalysts and lean NOx trap devices.

Innovation Solution

A wire mesh puck is axially retained within a conduit using a retaining arrangement that allows the peripheral side to float relative to the conduit's interior surface, with axial compression and optional secondary mechanisms to inhibit rotation, and can be mantle-less or with a mantle for support, reducing stress and improving reactant dispersion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the wire mesh puck is mechanically attached to the mantle at one or more points, then the structural stability is improved, but the stress on the mesh puck under vibrating conditions increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidstress on mesh puck

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

The patent removes the mechanical attachment of the wire mesh puck to the mantle, allowing the peripheral side to float relative to the conduit interior surface. This extraction of the mechanical connection eliminates the stress transmission path while maintaining positional stability through the retaining arrangement that holds the puck axially in place.

Inventive Principle:

Principle #2Taking out (Extraction)

2Stability of the object's composition

If the wire mesh puck is axially compressed to inhibit rotation, then the rotational stability is improved, but the axial force on the mesh puck increases

Engineering Contradiction:

Improverotational stabilityVSAvoidaxial force on mesh puck

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

The patent replaces the mechanical compression method with a secondary mechanism such as dimples extending into the peripheral edge of the mesh puck. These dimples engage with the conduit interior surface to prevent rotation without requiring axial compression forces, thereby eliminating the associated axial stress while maintaining rotational stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If the mantle is removed to reduce system complexity, then the device complexity is reduced, but the support structure for the mesh puck is compromised

Engineering Contradiction:

Improvenumber of partsVSAvoidsupport structure

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The patent makes the conduit serve multiple functions: it provides the flow path for exhaust gases and simultaneously acts as the support structure for the wire mesh puck through the retaining arrangement. The conduit's interior surface provides both flow guidance and mechanical support, eliminating the need for a separate mantle component while maintaining structural integrity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12359596B2Retention apparatus for wire mesh arrangement

Publication Date: 2025.07.15 DONALDSON CO INC

AI summary

An exhaust treatment device includes a dosing and mixing assembly having a wire mesh puck. A retaining arrangement holds the mesh puck and maintains the mesh puck in an axially compressed state. The compressive force may be sufficient to inhibit rotation of the wire mesh. A peripheral side of the wire mesh is allowed to float while edges of the axial ends are trapped between at least two stop members of the retaining arrangement.