Coil Device Bobbin Side Opening for Impact Resistance
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Solution Overview
Problem
Conventional coil devices used in antennas, particularly in the auto industry, lack sufficient impact resistance due to the hard epoxy resin bobbin surrounding the core member, which can cause the core member to collide with the bobbin's inner wall upon impact, reducing the device's ability to absorb shocks effectively.
Innovation Solution
The coil device design features a bobbin with a longitudinal concave portion and a side surface opening portion, allowing potting resin to surround the core member without being obstructed by the bobbin, and incorporates easily deformable members between the bobbin and outer case to absorb impacts, reducing the risk of core member collision and enhancing impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bobbin is constituted by hard epoxy resin and surrounds the entire periphery of the core member, then the structural strength is improved, but the core member collides with the inner wall of the bobbin upon impact, reducing impact resistance
Solution Approach 1:
The invention introduces a cushioning resin layer between the core member and the bobbin's inner wall. This resin layer is applied in advance to the bobbin's inner surface, creating a soft cushioning layer that absorbs impact energy before the core member can collide with the hard bobbin wall, thus preventing damage while maintaining structural strength
Solution Approach 2:
The invention creates a composite structure by combining the hard epoxy resin bobbin with a softer cushioning resin material. The bobbin provides structural strength while the cushioning resin provides impact absorption, creating a multi-material system that achieves both strength and impact resistance simultaneously
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
This configuration improves impact resistance by allowing the potting resin to effectively absorb shocks and distribute the force of an impact, reducing the likelihood of core member collision and enhancing the overall durability of the coil device.
Implementation Method 1
a potting resin filled in the housing concave portion and surrounding the bobbin with the coil portion... the potting resin enters the bobbin from the side surface opening portion and surrounds the core member... even if the coil device receives an impact, the core member does not collide with the inner wall of the bobbin
Implementation Method 2
An easily deformable member may be arrange between an outer wall of the bobbin and a bottom wall of the housing concave portion, and the easily deformable member is capable of being deformed before the bobbin and the outer case are deformed when the outer case receives an impact
Implementation Method 3
When the outer case receives an impact, the easily deformable member is easily deformed elastically or plastically (may be broken), and the impact transmitted to the outer case is weakened and transmitted to the bobbin
Data Source
AI summary
A coil device includes a core member, a bobbin, a coil portion, an outer case, and a potting resin. The core member extends in a longitudinal direction. The bobbin is provided with a longitudinal concave portion communicating with a side surface opening portion open to outside and housing the core member. The coil portion is provided with a wire wound around the bobbin. The outer case is provided with a housing concave portion configured to house the bobbin housing the core member and have the coil portion. The potting resin is filled in the housing concave portion and surrounds the bobbin with the coil portion. An opening port of the housing concave portion and the side surface opening portion are open in the same direction.