Antenna Unit Outer Case Mounting Gap Control
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Solution Overview
Problem
The existing antenna units with a double case structure face variations in the gap between the outer case and the vehicle roof due to accumulated dimension tolerances, leading to potential gaps and easy detachment under vibrations or shocks.
Innovation Solution
An antenna unit design where the outer case is directly attached to a base with an inner case, featuring a fitting mechanism with engaging protruding and sub-piece portions, and projecting pieces to reduce gaps and ensure secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer case is fitted to the inner case in a double case structure, then the waterproof function is achieved, but the gap between the outer case and the roof increases due to accumulated dimension tolerances
Solution Approach 1:
The patent introduces a mounting plate as an intermediary component between the base and the outer case. The mounting plate has a plate outer peripheral surface that directly contacts the roof, serving as a mediator that eliminates the gap formation issue. This intermediary structure allows the outer case to be mounted on the mounting plate rather than directly on the base, preventing the accumulation of dimension tolerances from affecting the gap between the outer case and the roof.
2Ease of manufacture
If the outer case is fitted to the inner case, then the antenna unit is assembled, but the outer case easily detaches under vibrations or shocks
Solution Approach 1:
The patent employs a clamp as a dynamic fastening mechanism that can actively adjust and maintain the outer case's position. The clamp is rotatably coupled to the mounting plate and can be rotated to clamp the outer case securely, providing dynamic adjustment capability to accommodate vibrations and shocks while maintaining reliable attachment.
Solution Approach 2:
The mounting plate is pre-installed on the base with precise positioning features before the outer case is attached. The plate outer peripheral surface is pre-formed to match the roof contour, and the clamp is pre-positioned on the mounting plate. This preliminary preparation ensures that when the outer case is installed, it immediately achieves stable attachment without requiring subsequent adjustments during vibration or shock conditions.
Data Source
AI summary
An antenna unit includes a base having a base-side fitting portion, antenna elements disposed on the base, an inner case fixed to the base and covering the antenna elements, and an outer case mounted on the base covering the inner case. The outer case 50 has an outer-case-side fitting portion fitted to the base-side fitting portion.