Externally Locking Adjustment Shaft for Vehicle Headlights
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Solution Overview
Problem
Conventional adjustment shafts for vehicle headlights are complex in design and production, requiring multiple components and molds, leading to issues with sealing and wear of O-rings due to high loads during adjustment.
Innovation Solution
The adjustment shaft features a latching hook with an offset opening, allowing for simpler design and production with fewer molds, improved sealing through an O-ring arrangement between circumferential shoulders, and reduced wear by eliminating axial force transfer to the O-ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional adjustment shafts use multiple components and molds for production, then the design can achieve basic functionality, but the manufacturing process becomes complex and requires a large number of molded parts
Solution Approach 1:
The patent combines multiple components (adjustment shaft, sealing ring housing, and mounting features) into a single integrated adjustment shaft component. This merging eliminates the need for separate parts and reduces the number of molds required, directly addressing the contradiction between manufacturing simplicity and device complexity
Solution Approach 2:
The adjustment shaft is designed to perform multiple functions simultaneously: it provides mechanical adjustment, houses the sealing ring, provides mounting latches, and defines the O-ring seat. This multi-functionality reduces the overall component count while maintaining all necessary functions, resolving the contradiction between ease of manufacture and device complexity
2Reliability
If axial forces during adjustment are transferred to the O-ring for sealing, then the sealing function is maintained, but the O-ring experiences high load and wears out quickly
Solution Approach 1:
The patent segments the force-bearing and sealing functions by introducing a dedicated sealing ring that sits in a circumferential groove. The sealing ring absorbs axial forces independently, preventing these forces from being transferred to the O-ring while maintaining the sealing function, thus resolving the contradiction between sealing reliability and O-ring service life
Solution Approach 2:
The sealing ring acts as an intermediary element between the adjustment shaft and the housing. It mediates the axial forces by providing a separate sealing interface that can withstand these forces, thereby protecting the O-ring from high load while maintaining the overall sealing integrity of the assembly
3Reliability
If the latching means is positioned to engage with the housing, then secure locking is achieved, but the design requires additional mold parts or slides for production
Solution Approach 1:
Instead of having the mold produce the latching features directly with complex slides or additional parts, the patent inverts the approach by designing the latching means as simple protrusions on the adjustment shaft that engage with corresponding features in the housing. This simplifies the mold design to basic injection molding without requiring complex moving parts or slides, resolving the contradiction between locking reliability and manufacturing simplicity
Data Source
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AI summary
The adjusting shaft has a head portion (11) and a pole (12) connected to the head portion. The pole has a basic shape rotationally symmetrical around a longitudinal axis. The head portion has a locking hook with a locking unit, where the locking hook outwardly projects from the longitudinal axis. A latching unit of a locking hook is oriented towards the shaft. The locking hook has an offset opening (23) through which the latching unit is exposed in the line of vision parallel to the longitudinal axis (c) of the head portion.