Adjustable Linkage Arm for Vehicle Headlamp Alignment
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Solution Overview
Problem
Variations in the length of linkage arms and mounting pivot locations in vehicle headlamp assemblies lead to misalignment of low and high beam light modules, resulting in diminished and potentially dangerous illumination due to the lack of relative adjustment between the modules.
Innovation Solution
An adjustable linkage arm with a wedge member and screw mechanism that allows translation along a first axis, enabling the arm extension members to move perpendicular to the axis, thereby allowing for precise alignment of the light modules by adjusting the distance between pivot balls coupled to the modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed-length linkage arm is used to connect light modules, then the structure is simple and manufacturing is easy, but manufacturing tolerances cause variations in pitch alignment between low and high beam modules
Solution Approach 1:
The linkage arm transitions from a fixed-length structure to an adjustable-length structure. The telescopic mechanism allows the linkage arm to extend or retract, enabling dynamic adjustment of the distance between mounting pivot locations. This dynamic capability compensates for manufacturing tolerances and ensures proper pitch alignment between light modules while maintaining a relatively simple overall structure.
2Manufacturing precision
If the linkage arm length is adjusted to compensate for tolerances, then alignment precision improves, but the device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The telescopic linkage arm employs a nested structure where one arm section is inserted within another. This nesting arrangement allows for length adjustment while minimizing the overall space required and reducing structural complexity. The nested design enables the adjustment mechanism to be compact and integrated within the linkage arm itself, rather than requiring separate external adjustment devices.
3Ease of manufacture
If mounting pivot locations vary due to tolerances, then component assembly is easier, but the relative pitch alignment between light modules deteriorates
Solution Approach 1:
The adjustable-length linkage arm changes the geometric parameter of the linkage length to compensate for variations in mounting pivot locations. By adjusting the linkage arm length, the system can accommodate different pivot positions resulting from manufacturing tolerances while maintaining the correct relative pitch alignment between light modules. This parameter adjustment restores the intended geometric relationships despite assembly variations.
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 adjustable linkage arm ensures proper alignment of light modules, enhancing illumination quality and safety by compensating for manufacturing tolerances and variations, ensuring synchronized and accurate aiming of both low and high beam light modules.
Implementation Method 1
a wedge screw rotationally coupled to the elongated housing and threadably engaged with the wedge member to provide translation of the wedge member along a first axis during rotation of the wedge screw
Implementation Method 2
translation of the wedge member along the first axis provides translation of the first arm extension member along a second axis perpendicular to the first axis
Data Source
AI summary
Provided is an adjustable linkage arm that includes an elongated housing, a wedge member situated inside the elongated housing, a wedge screw rotationally coupled to the elongated housing and threadably engaged with the wedge member to provide translation of the wedge member along a first axis during rotation of the wedge screw, and a first arm extension member situated at least partially inside the elongated housing and slidingly coupled to a first side of the wedge member, wherein translation of the wedge member along the first axis provides translation of the first arm extension member along a second axis perpendicular to the first axis.