Segmented Resin Bracket for Vehicle Camera Thermal Expansion
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Solution Overview
Problem
Large resin camera brackets for vehicles experience reduced adhesive strength between the bracket and window glass due to thermal expansion, leading to increased shear forces that can cause the adhesive to fail, especially when attaching large onboard devices like stereo cameras.
Innovation Solution
A resin bracket design featuring multiple pieces that can move relative to each other via coupling portions, allowing for thermal expansion absorption through elastic deformation, which reduces the shear force on the adhesive and maintains adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bracket size is increased to accommodate large onboard devices, then the bracket can support larger devices, but the thermal expansion amount increases causing larger shear force on the adhesive
Solution Approach 1:
The bracket is divided into multiple separate bracket pieces that are coupled together, rather than using a single large bracket. This segmentation allows each piece to expand independently, reducing the overall shear force transmitted to the adhesive while still supporting large onboard devices.
Solution Approach 2:
The coupling portions are designed to allow relative movement between bracket pieces, creating a dynamic structure that can absorb thermal expansion. This dynamic capability enables the bracket to adapt to temperature changes without generating excessive shear force on the adhesive.
2Volume of moving object
If the bracket size is increased, then it can accommodate larger onboard devices, but the adhesive strength between bracket and window glass reduces due to thermal expansion
Solution Approach 1:
By segmenting the bracket into multiple smaller pieces, the thermal expansion of each individual piece is reduced compared to a single large bracket. This prevents excessive shear force that would compromise adhesive strength, while the overall bracket structure remains large enough to support sizable onboard devices.
Solution Approach 2:
The dynamic coupling portions enable the bracket pieces to move relative to each other during thermal expansion, preventing the buildup of stress that would otherwise reduce adhesive strength. This maintains a stable connection between the bracket and window glass even when accommodating large devices.
3Device complexity
If the bracket is made as a single piece, then the structure is simple, but it cannot absorb thermal expansion causing adhesive failure
Solution Approach 1:
The bracket is divided into multiple bracket pieces coupled together, which introduces additional structural elements but enables the system to absorb thermal expansion. This segmentation prevents adhesive failure by allowing controlled movement, thereby improving reliability despite increased complexity.
Solution Approach 2:
The coupling portions are designed with dynamic characteristics that allow relative movement between bracket pieces. This dynamic design enables the bracket to absorb thermal expansion forces, maintaining reliable adhesive connection even though the structure is more complex than a single-piece bracket.
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 bracket effectively suppresses the reduction in adhesive strength between the bracket and window glass by absorbing thermal expansion, ensuring a stable attachment of onboard devices even under temperature changes.
Implementation Method 1
even if the respective bracket pieces undergo thermal expansion accompanying an increase in the temperature of the onboard device, such thermal expansion of the adjacent bracket pieces is absorbed by the coupling portions
Implementation Method 2
the coupling portion includes a deformable portion capable of elastic deformation. In the bracket of the second aspect, the coupling portion includes the deformable portion that is capable of elastic deformation, and this deformable portion undergoes elastic deformation so as to absorb thermal expansion of the adjacent bracket pieces
Data Source
AI summary
A resin bracket for fixing an onboard device to a window glass employed in a vehicle. The bracket includes plural bracket pieces, each configured to be adhered to the window glass, a coupling portion configured to couple together adjacent bracket pieces of the bracket pieces so as to allow relative movement therebetween, and an engaging portion provided at each of the bracket pieces so as to enable plural engagement portions provided at the onboard device to engage with the respective engaging portions.