Underbody Fairing Nut Mount With Elastic Ramp Retention

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

The existing methods for mounting bottom fairings under a vehicle chassis are difficult and require pre-equipment with nuts, which complicates the installation process and may affect the robustness of the nut's retention, while also potentially increasing costs and requiring multiple nut arrangements.

Innovation Solution

A device featuring a cell with an elastically deformable member and a ramp facilitates the insertion of a nut, using flexible tabs to guide and hold the nut in place, ensuring ease of installation without compromising retention and minimizing additional costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the nut is pre-installed on the fairing, then the installation process is facilitated, but the robustness of nut retention may be compromised and additional costs are incurred

Engineering Contradiction:
Improveease of installationVSAvoidrobustness of nut retention
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The elastically deformable member is pre-formed with a ramp structure that guides the nut during insertion. This preliminary preparation of the mounting structure enables easy nut installation while maintaining retention robustness through the elastic deformation mechanism that secures the nut in place

Inventive Principle:
Principle #10Preliminary action

2Volume of stationary object

If the cell volume is reduced, then the fairing design is optimized, but the ease of nut insertion is compromised

Engineering Contradiction:
Improvecell volumeVSAvoidease of nut insertion
Core Design Contradiction:
Volume of stationary objectVSEase of operation

Solution Approach 1:

The ramp structure utilizes the vertical dimension within the cell to guide the nut horizontally into place. By creating an inclined surface that spans from the cell bottom upward, the design enables nut insertion in a compact volume while maintaining ease of operation through the guiding action of the ramp

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If multiple nut arrangements are used, then different installation needs are met, but the device complexity and referencing increase

Engineering Contradiction:
Improveadaptability to different installation needsVSAvoiddevice complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The elastically deformable member with its ramp structure serves multiple functions: it guides the nut during insertion, provides retention through elastic deformation, and accommodates various nut types and installation scenarios. This universal design eliminates the need for multiple specialized mounting arrangements

Inventive Principle:
Principle #6Universality (Multi-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

The solution simplifies the nut installation process, enhances the ease of use, maintains robust nut retention, and reduces the need for multiple nut arrangements, thereby improving operational efficiency and cost-effectiveness in the automotive industry.

Implementation Method 1

at least one elastically deformable member which is provided inside the cell overhanging the bottom and which bears against a collar which includes nut

Methodology Applied
Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP3721101B1Device for mounting a nut inside a cavity of an underbody fairing configured to be fixed under a motor vehicle chassis
Publication Date: 2023.10.25 STELLANTIS AUTO SAS
  • EP3721101B1 patent drawingFigure 1
  • EP3721101B1 patent drawingFigure 2~3
  • EP3721101B1 patent drawingFigure 4~5

AI summary

The invention relates to a device for mounting a nut (8) inside a cavity (6) of an underbody fairing (3) configured to be fixed under a platform (2) of a motor vehicle chassis (1). The device comprises said cavity (6) having a bottom (9) against which the nut is applied (8) via at least one elastically deformable member (10a, 10b, 10c) arranged inside the cavity (6) overhanging the bottom (9) and pressing against a flange (13) that includes the nut (8). The elastically deformable member has a ramp (14) for guiding the flange (13) of the nut (8) in translation under the elastically deformable member (10a, 10b, 10c).