Hand Tool Mounting Structure Torque Bearing
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Solution Overview
Problem
Conventional mounting structures for hand tools are limited in their ability to bear large torques due to the small area of the inclined face that bears the stress, leading to inefficient torque transfer and potential structural failure.
Innovation Solution
A mounting structure with a cylindrical body featuring multiple protrusions and recesses, where the first and second inclined faces intersect at different angles, allowing for a support portion to extend and absorb torque, enabling the transfer of larger torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mounting portion uses a conventional inclined face with limited area, then the structure is simple and easy to manufacture, but the torque-bearing capacity is insufficient
Solution Approach 1:
The mounting portion is segmented into multiple functional elements: the inclined face for stress reception, the support portion for torque bearing, and multiple protrusions with recesses for mechanical interlocking. This segmentation allows each element to specialize in a specific function, enabling the overall structure to bear larger torques while maintaining manufacturing simplicity.
Solution Approach 2:
The invention transitions from a two-dimensional inclined face to a three-dimensional structure by adding the support portion that extends axially from the inclined face. This dimensional extension creates additional load-bearing surface area and allows torque to be distributed along the axial direction, significantly improving torque-bearing capacity without proportionally increasing complexity.
2Strength
If the inclined face area is increased to bear larger torque, then the torque-bearing capacity improves, but the mounting portion becomes more complex and the hand tool becomes larger
Solution Approach 1:
Instead of uniformly increasing the inclined face area throughout the entire mounting portion, the invention applies local quality enhancement by adding the support portion only where needed - extending axially from the inclined face at the stress concentration area. This localized addition provides the necessary torque-bearing capacity without proportionally increasing the overall length of the mounting portion.
Solution Approach 2:
The mounting portion combines multiple structural features (inclined face, support portion, protrusions, recesses) into a composite structure where each feature contributes differently to torque bearing. This composite approach allows efficient use of material and space, achieving high torque capacity without excessive size increase.
3Reliability
If the mounting portion bears maximum stress at the end, then the stress concentration is high leading to potential failure, but distributing stress would require a more complex structure
Solution Approach 1:
The support portion acts as an intermediary element between the inclined face and the mounting portion body. It receives the stress from the inclined face and distributes it axially along its length, preventing stress concentration at any single point. This intermediary structure improves reliability while adding minimal complexity compared to a completely redesigned stress distribution system.
Solution Approach 2:
The mounting portion is designed to dynamically distribute stress along the axial direction through the support portion rather than having static stress concentration at the end. The multiple protrusions and recesses provide dynamic mechanical interlocking that adapts to load variations, improving reliability under varying torque conditions.
Data Source
AI summary
A mounting structure of a hand tool includes a cylindrical body which has a mounting portion formed on one open end thereof. Multiple protrusions and recesses are formed in the inner periphery of the mounting portion. Each protrusion is connected to each of the adjacent recesses by a first conjunction line. A first face is defined annularly in the mounting portion. A second face is defined in one end of each protrusion. The first face intersects the second faces. The first face is located closer to the open end of the body than the second faces. The first and second face each are an inclined face relative to the open end of the body. The first angle is different from the second angle. A support portion extends from an edge of the first face so as to bear a larger torque.