Vehicle Lamp Optical Axis Adjustment Screw Assembly
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Solution Overview
Problem
The existing vehicle lamp assembly process is hindered by the need to screw pair of protruding pieces with an optical axis adjustment screw, limiting the degree of freedom and workability during assembly.
Innovation Solution
A vehicle lamp design where the optical member is pivotable with respect to the housing, featuring an optical axis adjustment screw supported in a second direction intersecting the first direction, and a protruding piece with groove portions on its rear end surface, along with a detachment preventing portion to maintain the screwed state, allowing single-piece screwing and enhanced assembly workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of protruding pieces are screwed with the optical axis adjustment screw at groove portions, then the optical member can be pivotably supported with respect to the housing, but the assembly workability is reduced and the degree of freedom in assembling is limited
Solution Approach 1:
The optical member is divided into a main body and a separate protruding piece. The protruding piece is a standalone component that can be independently positioned and assembled, allowing the groove portion to be formed only on this single protruding piece rather than requiring symmetric features on a pair of protruding pieces. This segmentation enables simpler assembly while maintaining the pivotable support function.
Solution Approach 2:
Instead of forming groove portions on both protruding pieces and requiring symmetric screwing operations, the invention inverts the approach by forming the groove portion only on the single protruding piece. The optical axis adjustment screw engages with this single groove portion, reversing the conventional symmetric assembly approach and significantly improving assembly workability.
2Ease of operation
If the groove portion is formed on the protruding piece for screwing with the adjustment screw, then the optical member can be adjusted, but the groove portion may disengage due to vibration or bending deformation
Solution Approach 1:
The detachment preventing portion is designed to preemptively counteract the disengagement force caused by vibration or bending deformation. By positioning this preventing portion to contact the protruding piece before disengagement can occur, it applies a preliminary counteracting force that maintains the screwed state between the groove portion and optical axis adjustment screw, ensuring reliable optical axis adjustment under vibrational conditions.
3Reliability
If a pair of protruding pieces are used for screwing, then the optical member can be securely mounted, but the weight and space of the optical member increase
Solution Approach 1:
The optical member is segmented into a main body and a single protruding piece rather than requiring a pair of protruding pieces. This reduction from two symmetric protruding pieces to one allows for decreased weight and space occupation while the protruding piece maintains secure mounting through the groove portion and detachment preventing portion configuration.
Solution Approach 2:
The functions of multiple protruding pieces are merged into a single protruding piece with an integrated groove portion. This consolidation combines the mounting and adjustment functions into one component, reducing the overall weight and space requirements of the optical member while maintaining secure attachment through the screw engagement with the groove portion.
Data Source
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AI summary
In a vehicle lamp (10), an optical axis adjustment screw (40) for pivoting an optical member (30) around a pivotal axis (Ax1) extending in a vehicle width direction is supported by a lamp body (12) in a state of extending in a vertical direction on the rear side of the vehicle lamp (10) with respect to pivotal axis (Ax1). A protruding piece (34B) extending toward the rear of the vehicle lamp (10) is formed in the optical member (30), and a groove portion (34Ba) to be screwed with a threaded portion (40a) of the optical axis adjustment screw (40) is formed in the rear end surface of the protruding piece (34B). The groove portion (34Ba) of the protruding piece (34B) and the threaded portion (40a) of the optical axis adjustment screw (40) can be maintained in the screwed state.