Vehicle Housing Screw Structure That Preserves Inner Space
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Solution Overview
Problem
In vehicle-mounted electronic apparatuses, increasing the drawing depth of a screw fastening structure to accommodate a larger outer edge for screw seating narrows the inner space of the metal housing, which is undesirable when the screw fastening structure cannot protrude from the housing.
Innovation Solution
A screw fastening structure with a drawn portion protruding into the metal housing and a bent portion outside, featuring a flat first receiving surface and a protruded second receiving surface perpendicular to the housing, which together form a screw receiving portion with sufficient area without requiring increased drawing depth, thus minimizing space narrowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the drawing depth of the drawn fastening portion is increased to provide a larger outer edge for screw seating, then the seating area for the screw is improved, but the inner space of the metal housing is narrowed
Solution Approach 1:
The invention transitions from a single-plane drawing structure to a three-dimensional bent structure. The outer edge is bent to extend in a direction substantially perpendicular to the normal direction of the bottom surface, creating a multi-dimensional configuration that provides sufficient screw seating area without increasing the drawing depth into the housing interior.
Solution Approach 2:
The outer edge is divided into multiple functional segments: a first outer edge portion that forms the bent structure for screw seating, and a second outer edge portion that extends from the bent portion. This segmentation allows each portion to serve specific functions - the bent portion provides seating area while the extended portion maintains the outer dimension without protruding from the housing.
2Ease of manufacture
If the drawing depth is increased to accommodate a larger outer edge, then the screw fastening structure is improved, but the inner space of the metal housing is reduced
Solution Approach 1:
Instead of increasing drawing depth in the vertical direction, the invention utilizes the horizontal dimension by bending the outer edge outward and extending it perpendicular to the housing normal. This dimensional shift provides adequate screw access and seating area while preserving the inner housing volume.
Solution Approach 2:
Rather than drawing the fastening portion deeper into the housing to increase seating area, the invention inverts the approach by bending the outer edge outward and extending it in a direction that provides seating area without increasing drawing depth, effectively working outward rather than inward.
Data Source
AI summary
A drawn portion having a shape protruding from a side face to a space inside a housing is provided at an end to which a rear surface cover is fastened of the side face. On a side to which the rear surface cover is fastened of the drawn portion, a bent portion having a shape bent toward a space outside the housing is provided. A screw receiving portion including a screw hole includes a first receiving surface, which is a flat surface portion on an end of the bent portion, and a second receiving surface having a shape protruding from a base of the bent portion.