Inflator Bracket Absorption Feature for Squeak and Rattle
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Solution Overview
Problem
Existing inflator brackets for air curtain assemblies in vehicles fail to effectively absorb energy and reduce movement relative to the vehicle body, leading to squeak-and-rattle issues and inefficient energy dissipation.
Innovation Solution
An inflator bracket with an elongate body and a cantilevered absorption feature that adjusts from an initial position to a bent and then a flattened position in response to a predefined force, providing two stages of energy absorption to reduce movement and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid inflator bracket is used to maintain spacing, then structural stability is improved, but energy absorption capability deteriorates leading to squeak-and-rattle issues
Solution Approach 1:
The bracket transitions from a static rigid structure to a dynamic structure with an absorption feature that can change its mechanical properties. The absorption feature includes a curved portion that can deform elastically under load, allowing the bracket to adapt its stiffness based on applied forces, thereby providing both spacing stability and energy absorption.
Solution Approach 2:
The bracket utilizes changes in geometric parameters of the absorption feature (curvature radius, thickness, length) to control its mechanical behavior. By carefully designing these parameters, the bracket achieves optimal balance between maintaining spacing stability and absorbing impact energy, preventing squeak-and-rattle while preserving structural integrity.
2Object-generated harmful factors
If an energy-absorbing bracket design is implemented, then noise reduction is improved, but structural strength deteriorates
Solution Approach 1:
The bracket employs a composite structure combining a rigid elongate body for structural strength with a flexible absorption feature for noise reduction. This composite design allows different portions of the bracket to serve different functions - the elongate body maintains structural integrity while the absorption feature with its curved geometry dissipates energy to reduce squeak-and-rattle noise.
Solution Approach 2:
The bracket is segmented into distinct functional zones: the elongate body portion provides structural support, while the separate absorption feature portion handles energy dissipation. This segmentation allows each component to be optimized independently - the elongate body for strength and the absorption feature with its curved portion for noise reduction through controlled deformation.
3Object-generated harmful factors
If the absorption feature is made more prominent to increase energy absorption, then noise reduction is improved, but device complexity increases
Solution Approach 1:
The absorption feature is merged with the elongate body to form an integrated bracket structure. Rather than being a separate component, the absorption feature is formed as part of the bracket itself, reducing assembly complexity while maintaining effective energy absorption capabilities through its curved geometry that provides progressive deformation.
Solution Approach 2:
The absorption feature utilizes curved geometry instead of straight lines or angular shapes. The curved portion allows for progressive deformation under load, providing smooth energy absorption while maintaining structural continuity. This curvature-based design achieves effective noise reduction without adding complex geometric features or multiple components.
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 inflator bracket effectively reduces movement and noise by absorbing energy through bi-modal deceleration, maintaining spacing and configuration between the air curtain assembly and the vehicle body, while maintaining an efficient package without impinging cabin space.
Implementation Method 1
The absorption feature is configured to adjust to at least one of a bent position and a flattened position in response to a predefined force
Data Source
AI summary
An inflator bracket includes an elongate body having a first end and a second end. The elongate body defines an aperture proximate to the first end. A hook extends from the first end. An absorption feature has a proximal end coupled to the elongate body proximate to the aperture. The absorption feature defines a curve between the proximal end and a distal end. The distal end is spaced from the elongate body and the aperture.