Sheet Metal Retainer Clip for Automotive Headlamp Connector
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Solution Overview
Problem
Conventional electrical connectors in automotive headlamps, such as mini-bridge connectors, often provide insufficient retention force, leading to unintentional disconnection of wiring harness connectors from the printed circuit board headers, which can result in unreliable electrical connections.
Innovation Solution
A stamped sheet metal retainer clip is attached to the heat sink of the headlamp, enhancing the retention force by blocking the connector and using barbs and resilient engaging arms to secure the clip to the heat sink, thereby increasing the resistance to disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional electrical connectors with plastic latches are used, then the device complexity is low, but the retention force is insufficient (approximately 20 N)
Solution Approach 1:
The solution divides the retention system into two independent parts: the conventional plastic latch connector and the additional sheet metal clip. The clip is a separate component that attaches to the heat sink and provides additional retention force, rather than modifying the existing connector design. This segmentation allows the system to achieve higher retention force while keeping each component relatively simple.
Solution Approach 2:
The sheet metal clip acts as an intermediary element between the heat sink and the connector assembly. It provides additional retention force by mechanically engaging with both the heat sink (via resilient arms and barbs) and the connector (by blocking disconnection). This intermediary component resolves the contradiction by adding strength without requiring complex redesign of the original connector.
2Reliability
If a sheet metal clip is added to enhance retention force, then the reliability of electrical connection is improved, but the device complexity increases
Solution Approach 1:
The sheet metal clip is designed to be self-installing onto the heat sink using its own resilient arms and barbs, without requiring additional fasteners, adhesives, or complex assembly tools. The clip's own structural features provide the mounting mechanism, making installation straightforward and reducing the overall system complexity despite adding a component for improved reliability.
3Force
If the clip is secured to the heat sink using barbs and resilient arms, then the retention force is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The clip utilizes elastic deformation of the resilient arms as a key parameter to achieve secure mounting. By designing the arms with appropriate flexibility and the barbs with suitable geometry, the system achieves strong retention force through elastic recovery rather than requiring precise interference fits or high-tolerance machining. This approach to parameter selection reduces manufacturing precision requirements while maintaining high retention force.
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 retainer clip effectively enhances the retention force beyond conventional connectors, ensuring stable connections between the wiring harness and the printed circuit board headers, even under increased loads, and can be easily retrofitted onto existing lamps without disassembly.
Implementation Method 1
a pair of resilient engaging arms 164, 166 can be clipped onto a heat sink rib 22
Implementation Method 2
with one or more barbs 165 that can resist separation of the clip 100 from the heat sink rib 22
Data Source
AI summary
Retainer clip (100) attachable to automotive headlamp (10) for inhibiting second electrical connector (72) of wiring harness (44) from unintentionally separating from mating first connector (52) on the PCB (60) of the lamp. Clip (100) has central first beam (110) to contact lamp (10), lamp-retaining support base (160) depending from one end of first beam (110) to engage lamp (10), and second connector-blocking region (140) extending from an opposite end of first beam (110) that, upon assembly proximate second connector (72), inhibits separation of the connectors (52, 72). Clip (100) is stamped from sheet metal. Support base (165) has engaging arms (164, 166) joined by bight (162) either to be clipped over one fin (22) of heat sink (20) or to be squeezed between two neighboring fins (22). Engaging arms (164, 166) have protruding barbs (165) to resist separation of support base (165) from heat sink (20).