Vehicle Lamp Optical Component Mounting Against Screw Torque Shift
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Solution Overview
Problem
Existing vehicle lamp designs experience positional deviation of optical components due to torque transmission during screw fastening, as the positioning hole diameter is larger than the positioning pin to accommodate dimensional variations.
Innovation Solution
A vehicle lamp design featuring a support member with a screw hole and two protrusions that align along a straight line, and an optical component with a screw through hole and positioning holes shifted by offset values along the rotation direction, ensuring precise alignment and preventing positional deviation during screw fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the positioning hole diameter is designed to be larger than the positioning pin to accommodate dimensional variations, then the ease of assembly is improved, but positional deviation occurs during screw fastening due to torque transmission
Solution Approach 1:
The positioning function is segmented into multiple independent positioning holes instead of a single positioning hole. These positioning holes are distributed around the screw hole, allowing the optical component to be positioned in multiple points simultaneously. This segmentation distributes the torque transmission effects and prevents rotational deviation while maintaining assembly ease.
Solution Approach 2:
The patent introduces an intermediary structure (the distributed positioning holes acting as mediators between the optical component and the support member) that transfers and distributes the positioning forces. This intermediary mechanism allows the component to be firmly positioned while accommodating dimensional variations and preventing torque-induced rotation.
2Device complexity
If a single screw member is used to fix the optical component, then the device complexity is reduced, but positional deviation occurs due to torque transmission during rotation
Solution Approach 1:
The single screw fixing system is enhanced by segmenting the positioning function into multiple positioning holes arranged in a circular pattern around the screw hole. This segmentation allows the simple single-screw structure to achieve multi-point positioning, preventing rotational deviation while maintaining low complexity.
Solution Approach 2:
The positioning holes are arranged in a circular dimension around the screw hole, adding a radial dimension to the positioning system. This circular arrangement creates a stable triangular or multi-point positioning geometry that prevents rotation in the planar dimension, effectively suppressing positional deviation without increasing structural complexity.
Data Source
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AI summary
A vehicle lamp includes: a light source unit; an optical system that irradiates the front of a vehicle with light from the light source unit; a shade that blocks part of light guided by the optical system; and a support member that supports the light source unit, the optical system, and the shade. At least one optical component among the light source unit, the shade, and the optical system is fixed to the support member with one screw member. The support member includes: a screw hole; and two protrusions provided at positions across the screw hole. The optical component includes: a screw through hole; and positioning holes that are provided at positions across the screw through hole and into which the two protrusions are inserted. The screw hole and the two protrusions are aligned in a first direction along a straight line. The two positioning holes respectively have diameters larger than the diameters of the protrusions and are disposed at positions shifted, with respect to positions in the first direction with reference to the screw through hole, by predetermined offset values along a rotation direction in fixing the screw member.