Fastener Engaging Hole Structure for Anti-Slip Torque Transfer
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Solution Overview
Problem
Conventional fasteners with polygonal engaging holes and grooves suffer from weak structural strength and inadequate torque transmission due to obtuse and acute angles, leading to potential slipping disengagement and damage.
Innovation Solution
A fastener design featuring a driving end with three radially and angularly arranged rectangular slots, each with two right angles, forming ribs between adjacent slots, which enhances structural strength and torque transmission by distributing stress evenly and providing a large abutment area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grooves are formed on the engaging side faces to prevent slipping engagement, then the anti-slip performance is improved, but the structural strength deteriorates due to obtuse and acute angles causing weak structures
Solution Approach 1:
The engaging side face is segmented into multiple planar surfaces (first, second, third, and fourth planes) instead of using a single grooved surface. This segmentation eliminates weak corner structures while maintaining anti-slip capability through the multi-plane configuration that provides friction surfaces for the wrench.
2Reliability
If grooves are formed on the engaging side faces to prevent slipping engagement, then the anti-slip performance is improved, but the torque transmission capability deteriorates due to inadequate force transmission from obtuse and acute angles
Solution Approach 1:
The engaging side face is divided into multiple planar surfaces that can independently transmit torque forces. The first plane receives torque from the wrench and transmits it through the second and third planes to the fourth plane, creating efficient force transmission paths without the weakness of grooved corner structures.
3Reliability
If conventional grooved design is used, then the anti-slip function is achieved, but the structure becomes complex and more prone to damage
Solution Approach 1:
Instead of adding grooves to a simple polygonal structure, the invention segments the engaging side face into multiple planes, achieving anti-slip functionality through geometric configuration rather than additional features. This reduces structural complexity while maintaining the anti-slip function.
Data Source
AI summary
A fastener is provided, including: a driven end including an engaging hole which includes three slots recessed radially and angularly arranged in intervals, each of the three slots being formed as a part of a rectangle and including two right angles, every adjacent two of the three slots defining a rib therebetween.