Stepped Positioning Pin Assembly for Accurate Component Alignment
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Solution Overview
Problem
Existing component assembly structures for vehicles, such as display apparatuses, face issues with positioning accuracy due to damage from fitting holes and difficulty in securing components with conical trapezoidal projections, leading to play and improper alignment.
Innovation Solution
A component assembly structure featuring a positioning pin with a first shaft portion of larger diameter and a second shaft portion of smaller diameter, allowing the first component to be fitted without damaging the second shaft portion and enabling precise positioning of both components by fitting the first hole to the first shaft portion and the second hole to the second shaft portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hole of the light guide plate and the hole of the dial plate are fitted and assembled in that order to the projection of the support column, then the components can be assembled, but the outer peripheral surface of the projection may be scraped and damaged, leading to improper fitting and positioning inaccuracy
Solution Approach 1:
The positioning pin is segmented into two distinct portions: a first shaft portion with a larger diameter for fitting the first component's hole, and a second shaft portion with a smaller diameter for fitting the second component's hole. This segmentation allows each component to be fitted to its corresponding shaft portion without interfering with the other, preventing surface damage and ensuring accurate positioning for both components.
2Strength
If a conical trapezoidal projection is used to secure the L metal fitting, then the fitting can be secured, but accurate positioning of the L metal fitting becomes difficult
Solution Approach 1:
Different portions of the positioning pin have different diameters tailored to specific functions: the first shaft portion has a larger diameter optimized for positioning the first component, while the second shaft portion has a smaller diameter optimized for positioning the second component. This local differentiation of geometric properties allows each component to achieve both accurate positioning and secure fitting without the compromises required by a uniform conical trapezoidal projection.
Data Source
AI summary
The component assembly structure includes a component to be assembled in which a positioning pin is provided on a base, a first component with a first hole to be fitted to the positioning pin, and a second component with a second hole to be fitted to the positioning pin. The positioning pin includes a first shaft portion in the side on the base and a second shaft portion, having a diameter smaller than that of the first shaft portion, in the side on the tip end. The first component is positioned on the component to be assembled by fitting the first hole to the first shaft portion. The second component is positioned on the component to be assembled by fitting the second hole to the second shaft portion.