Vehicle Roof Antenna Mounting Unit with Torque Grooves
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Solution Overview
Problem
Existing antenna mounting units for vehicles are complex, leading to increased manufacturing costs and weight due to multiple materials, and they fail to securely fix antennas on the roof due to torsional torque issues during nut fastening.
Innovation Solution
An integrated antenna mounting unit with a fastening member, upper cover, sealing member, and fixing nut, where the fastening member features coupling and torque grooves, and is made of polyamide, with an upper cover of ASA and sealing member of TPV, to enhance stability and reduce weight and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the antenna mounting unit uses multiple constituent elements (base, cover, holders, bolts, nuts) made of different materials, then the structural strength and fastening capability are improved, but the weight and manufacturing cost are increased
Solution Approach 1:
The base and cover are integrated into a single piece structure, eliminating the need for separate holders and reducing the number of fastening elements. This integration maintains structural strength while reducing weight by consolidating multiple components into one optimized part.
Solution Approach 2:
The single-piece mounting unit performs multiple functions: it provides structural support, acts as a mounting base, serves as a cover, and includes integrated fastening features. This multi-functionality eliminates the need for separate components while maintaining all necessary capabilities.
2Strength
If the antenna mounting unit uses multiple constituent elements (base, cover, holders, bolts, nuts), then the structural strength and fastening capability are improved, but the assembly complexity and manufacturing cost are increased
Solution Approach 1:
The base and cover are merged into a single injection-molded component, eliminating the need for separate assembly of holders, bolts, and nuts. This reduces assembly complexity from multiple steps involving multiple parts to a single integrated component installation.
Solution Approach 2:
While the overall structure is integrated, the single piece includes segmented functional features such as coupling grooves and torque grooves that provide specific mechanical functions without requiring separate components, simplifying both manufacturing and assembly.
3Reliability
If the nuts are fastened to fix the antenna mounting unit, then the antenna is secured to the roof, but torsional torque causes improper fixation
Solution Approach 1:
The problematic nut fastening step is replaced by an integrated snap-fit coupling mechanism with coupling grooves and torque grooves. This extracts the torsional torque issue from the design by eliminating the need for threaded fasteners that are susceptible to improper tightening.
Solution Approach 2:
The coupling grooves and torque grooves are designed to automatically align and engage with corresponding features on the mounting surface, providing self-aligning fixation that eliminates the need for precise manual fastening operations and prevents improper installation.
Data Source
AI summary
A roof antenna mounting unit for a vehicle is provided. The roof antenna mounting unit is mounted in a mounting aperture formed in a roof of a vehicle and fixes an antenna. The mounting unit includes a fastening member having a molding portion and a fastening portion that is inserted into the mounting aperture. An upper cover is integrally coupled to the fastening member by injection molding to surround an outer circumferential surface of the molding portion and is disposed at an upper side extraneous to the roof. A sealing member is interposed between the roof and the upper cover and a fixing nut is mounted on the fastening portion inserted into the mounting aperture at a lower side in the roof.