Dynamic Hook Insert for Vehicle Seat Back Noise
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Solution Overview
Problem
Existing movable seat back designs in vehicles generate objectionable buzzing, squeaking, and rattling (BSR) noises due to vibrations at the connection between the seat back and the cabin wall, and fail to effectively accommodate dimensional variances between the striker pin and the latch bracket, leading to partial noise reduction and premature wear.
Innovation Solution
A dynamic hook insert with a resiliently bendable section is attached to the latch bracket, forming a U-shaped channel to slidably receive the striker pin, dynamically absorbing vibrations and accommodating dimensional variances by creating a flexible interface between the seat back and the cabin wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid metallic latch bracket with a U-shaped slot is used to tether the seat back to the cabin wall, then the seat back can be securely positioned, but vibrations are transmitted directly into the seat frame causing BSR noise
Solution Approach 1:
A polymeric hook insert is introduced as an intermediary component between the rigid latch bracket and the striker pin. This insert lines the U-shaped slot and provides a compliant interface that absorbs vibrations while maintaining the tethering function, thereby reducing BSR noise without compromising secure positioning.
Solution Approach 2:
The material properties of the hook insert are specifically designed to change the vibration transmission characteristics. The polymeric material has different damping properties compared to metal, transforming the rigid connection into a vibration-absorbing connection while maintaining mechanical strength for secure positioning.
2Object-generated harmful factors
If a static vibration dampening insert is used to line the U-shaped slot, then some noise is dampened, but vibrations are still transmitted directly into the seat frame and resonate with BSR symptoms
Solution Approach 1:
The hook insert is designed with a dynamic resilient section that can flex and deform in response to vibrations. This dynamic capability allows the insert to actively absorb and dissipate vibration energy rather than merely providing static damping, thereby reducing both noise and vibration transmission to the seat frame.
Solution Approach 2:
The resilient section of the hook insert functions as a flexible element that can deform under vibrational loads. This flexibility enables the insert to conform to dimensional variances in the striker pin while simultaneously absorbing vibration energy, addressing both noise reduction and vibration isolation requirements.
3Object-generated harmful factors
If the U-shaped slot is made tight-fitting to reduce play, then BSR and premature wear are reduced, but operation becomes stiff and wear increases
Solution Approach 1:
The polymeric material of the hook insert provides a balance between fit and flexibility. The material properties can be optimized to provide sufficient friction for secure positioning while maintaining enough compliance to allow smooth operation, thereby eliminating both excessive play and stiff operation.
Solution Approach 2:
The combination of rigid latch bracket and compliant polymeric insert creates a composite connection system. The rigid bracket provides structural strength while the polymeric insert provides compliance and vibration damping, achieving both secure positioning and smooth operation without excessive wear.
4Adaptability or versatility
If dimensional variances between striker pin and slot are accommodated, then fit is improved, but play increases intensifying BSR and premature wear
Solution Approach 1:
The resilient section of the hook insert acts as a flexible element that can deform to accommodate dimensional variances in the striker pin. This flexibility allows the insert to conform to slight variations in pin diameter or slot width while maintaining sufficient contact pressure to prevent excessive play and associated BSR noise and wear.
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 dynamic hook insert significantly reduces vibration-induced noise and wear by dynamically deflecting vibrations and adjusting to dimensional variations, providing a snug and durable fit between the seat back and the cabin wall, enhancing the operational stability and longevity of the seating system.
Implementation Method 1
dynamically absorb vibrations transferred to and from the striker pin
Implementation Method 2
resiliently bendable section... dynamically deflecting in the region of abutting contact with the striker pin
Implementation Method 3
automatically accommodating dimensional variances in the striker pin
Data Source
AI summary
A device and method for reducing noises created by a movable seat back that is tethered to a cabin wall. The seat back has a latch bracket that hooks over a rigid striker pin extending from the cabin wall. A dynamic hook insert, manufactured from a polymeric material, lines the latch bracket and makes direct contact with the striker pin. The insert is provided with a resiliently bendable section spaced from direct contact with the latch bracket. The resiliently bendable section is dynamically movable for absorbing vibrations transferred to and from the striker pin and for automatically accommodating dimensional variances in the striker pin.