Vehicle Mounting Bracket Hole Layout for Secure In-Vehicle Assembly
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Solution Overview
Problem
Existing in-vehicle systems face challenges in aligning mounting holes on the vehicle mounting bracket with screw holes on the in-vehicle device, leading to misalignment and insufficient friction during fastening, which can result in loose screws.
Innovation Solution
The in-vehicle system incorporates a vehicle mounting bracket with mounting holes that have a larger diameter than the screw holes on the in-vehicle device, with the vertical diameter of the mounting holes increasing towards the rear side, allowing for alignment and sufficient friction to achieve necessary fastening force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mounting holes on the vehicle mounting bracket are enlarged to avoid misalignment, then the alignment between mounting holes and screw holes is improved, but the contact area between the bearing surface of the screws and the vehicle mounting bracket becomes smaller, leading to insufficient friction and loose screws
Solution Approach 1:
The patent applies local quality by making the mounting holes non-uniform in size - specifically, the mounting holes have different diameters along the vehicle longitudinal direction, with the front mounting hole having a larger diameter than the rear mounting hole. This local variation allows each mounting hole to be optimized for its specific position, accommodating misalignment at the front while maintaining sufficient contact area at the rear for reliable fastening.
Solution Approach 2:
The patent changes the parameter of mounting hole diameter from a uniform value to a variable value along the vehicle longitudinal direction. By making the diameter of mounting holes different at different positions (larger at the front, smaller at the rear), the system can simultaneously achieve misalignment accommodation and sufficient fastening reliability through adjusted friction.
2Adaptability or versatility
If the mounting holes on the vehicle mounting bracket are made with larger diameter, then the alignment tolerance is increased, but the friction force during fastening is reduced
Solution Approach 1:
The patent applies local quality by making the mounting holes non-uniform in size - specifically, the mounting holes have different diameters along the vehicle longitudinal direction, with the front mounting hole having a larger diameter than the rear mounting hole. This local variation allows each mounting hole to be optimized for its specific position, accommodating misalignment at the front while maintaining sufficient contact area at the rear for reliable fastening.
Solution Approach 2:
The patent changes the parameter of mounting hole diameter from a uniform value to a variable value along the vehicle longitudinal direction. By making the diameter of mounting holes different at different positions (larger at the front, smaller at the rear), the system can simultaneously achieve misalignment accommodation and sufficient fastening reliability through adjusted friction.
Data Source
AI summary
An in-vehicle system includes: an in-vehicle device that includes a device main unit with a panel provided on a front surface thereof; a cluster panel that is arranged on the panel; a positioning mechanism which mutually positions the panel and the cluster panel; a vehicle mounting bracket that is fixed to the cluster panel and the device main unit, and that is mounted on a vehicle; and multiple mounting holes that are aligned in a vehicle longitudinal direction in the vehicle mounting bracket and which correspond to screw holes which are provided on a side surface of the device main unit, each of which has a larger diameter than each of screw holes, and a vertical diameter of the mounting hole is formed to be larger as the mounting hole is positioned towards a vehicle front side.