Engine Fastener Limiter With Captive Retention for Flexible Assembly

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Solution Overview

Problem

Current engine component assembly methods face inefficiencies due to the need for multiple fasteners and potential misalignment or loss during assembly, leading to increased production time and risk of warped components.

Innovation Solution

A fastener retention apparatus featuring a rigid limiter with an integrated compressible fastener retention feature, allowing for limited radial and axial movement of captive fasteners, reducing the risk of misplacement and warping by providing flexibility during assembly and shipping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rigid fastener retention devices are used to hold captive fasteners, then fastener security during shipping is improved, but assembly flexibility and tolerance accommodation deteriorate

Engineering Contradiction:
Improvefastener securityVSAvoidassembly flexibility
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by transitioning from a completely rigid retention structure to one incorporating elastomeric material. This changes the physical state and mechanical properties of the retention device, allowing it to deform elastically during assembly to accommodate tolerance variations, then maintain secure retention during shipping. The elastomeric material's ability to change its deformation state resolves the contradiction between rigidity for security and flexibility for assembly.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by integrating elastomeric material within the fastener retention device structure. This creates a hybrid system combining rigid structural elements with flexible elastomeric components. The composite structure provides both the security of rigid retention and the flexibility of elastomeric deformation, simultaneously satisfying both requirements that were previously contradictory.

Inventive Principle:
Principle #40Composite materials

2Reliability

If multiple separate fasteners are used for assembly, then fastening reliability is improved, but the risk of loss and misplacement increases

Engineering Contradiction:
Improvefastening reliabilityVSAvoidfastener loss
Core Design Contradiction:
ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies merging by integrating the fastener retention function directly into the engine component structure rather than using separate, independent fastener retention devices. The retention features are formed as integral parts of the component itself, combining the structural element with the retention function. This eliminates loose retention devices that could be lost during handling while maintaining secure fastener captivity.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The patent implements self-service by designing the engine component to provide its own fastener retention capability through integrated features. The component structure itself serves the dual purpose of structural support and fastener retention, eliminating the need for separate retention devices. This self-sufficient design prevents loss of retention components during shipping and assembly while maintaining fastening reliability.

Inventive Principle:
Principle #25Self-service

3Manufacturing precision

If precision fasteners are used to ensure proper fit, then assembly accuracy is improved, but resistance to insertion increases

Engineering Contradiction:
Improveassembly accuracyVSAvoidinsertion ease
Core Design Contradiction:
Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies parameter changes by utilizing the elastomeric material's ability to change its physical state during insertion. The material transitions from a relaxed state during insertion (accommodating precision fasteners easily) to a constrained state after insertion (providing secure retention). This dynamic parameter change in the elastomeric material's deformation characteristics resolves the contradiction between precise fit and insertion resistance.

Inventive Principle:
Principle #35Parameter changes

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 enhances assembly efficiency by reducing the number of components required and minimizing assembly resistance, while maintaining fastener integrity and preventing warping, thus improving production speed and reducing the likelihood of fastener loss.

Implementation Method 1

the fastener retention feature comprising a compressible material, the fastener retention apparatus shaped to receive a fastener within the interior passage and through the fastener retention feature

Methodology Applied
Scientific EffectCompression: Compression

Implementation Method 2

By having the integrated fastener retention feature comprised of a compressible material, the captive fastener may have limited (e.g., a small amount of) radial and/or axial play within the fastener retention apparatus

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentUS11118478B2Limiter with integrated fastener retention for an engine assembly component
Publication Date: 2021.09.14 FORD GLOBAL TECH LLC
  • US11118478B2 patent drawing
  • US11118478B2 patent drawing
  • US11118478B2 patent drawing

AI summary

Methods and systems are provided for an engine component assembly having one or more fastener retention apparatuses. In one example, a system may include each of the one or more fastener retention apparatuses including a rigid limiter and an integrated fastener retention feature adhered to an inner surface of an interior passage of the rigid limiter. Further, one or more fasteners may be held captive by each of the one or more fastener retention apparatuses capturing one fastener of the one or more fasteners.