Segmented Projection Ribs for Backlash Suppression in Connection Boxes
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Solution Overview
Problem
Conventional clearance filling structures in accommodation boxes and electric connection boxes face challenges in effectively suppressing backlash between the casing and the accommodation target object as the length of the installation target wall surface increases, leading to reduced adhesion and enhanced backlash suppression difficulties.
Innovation Solution
The proposed clearance filling structure incorporates a plurality of projecting portions on the internal and external wall surfaces of the accommodation chamber and the accommodation target object, which extend along the insertion direction and are formed to correspond with the demolding direction from a molding die, allowing for division into multiple regions with at least one projecting portion in each region, and are disposed with varying orientations to enhance contact and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the length of the installation target wall surface is increased to enhance backlash suppression, then the adhesion between the rib and counterpart deteriorates due to larger height difference
Solution Approach 1:
The single continuous rib structure is divided into multiple discrete ribs arranged along the insertion direction. Each rib has a controlled length that maintains adequate adhesion, while the collective arrangement of multiple ribs covers the entire wall surface to suppress backlash effectively. This segmentation allows each rib to maintain strong adhesion individually while the group provides comprehensive backlash suppression.
2Ease of manufacture
If the rib is made inclined with height difference for demolding, then the adhesion on one end improves but adhesion on the other end deteriorates
Solution Approach 1:
By dividing the rib structure into multiple segments, each rib can be designed with optimal inclination for demolding while maintaining adequate adhesion. The segmentation allows each individual rib to have controlled dimensions where the height difference is manageable, preventing adhesion failure at the lower end while still enabling demolding.
Solution Approach 2:
Different ribs can have different local characteristics including varying heights, inclinations, and positions. This allows optimization of each rib's adhesion properties according to its specific location, while the overall arrangement maintains effective backlash suppression across the entire accommodation chamber.
Data Source
AI summary
An accommodation chamber includes an internal wall surface to be disposed to face an accommodation target object at an interval, the accommodation target object includes an external wall surface to be disposed to face the internal wall surface at an interval, one wall surface of the internal wall surface and the external wall surface includes a plurality of projecting portions that project toward another wall surface thereof, and extend along an insertion direction of the accommodation target object to the accommodation chamber, and contact the other wall surface, and the projecting portions are formed so that a demolding direction from a molding die forming the one wall surface corresponds to an extending direction, and the one wall surface is divided into a plurality of regions along the insertion direction.