Single-Shaft Rotary Friction Structure for Adjustable Torque and Lower Wear
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Solution Overview
Problem
Conventional pivot shaft devices suffer from excessive wear due to frictional forces and design limitations that protrude ends, restricting their application and aesthetics in electronic devices.
Innovation Solution
A torque-variable single-shaft rotary shaft structure with multiple frictional pairs, featuring a pivot shaft with an adjustment wheel assembly, frictional assembly, and elastic assembly on one end, allowing for variable torque distribution and reduced wear through alternating frictional contacts and elastic fastening, while being compact enough to be concealed within electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the torque is provided by frictional force between the recessed wheel and the raised wheel, then the torque device can achieve torque transmission, but the recessed wheel and the raised wheel are subject to serious wear
Solution Approach 1:
The invention divides the single frictional pair into multiple frictional pairs by introducing additional frictional members (first frictional member and second frictional member) that contact the recessed wheel and raised wheel respectively. This segmentation distributes the normal force and frictional force across multiple contact points, reducing wear on each individual contact surface while maintaining the required torque transmission capability.
2Force
If the first and second supports are disposed at the middle section of the pivot shaft with elastic bodies on two sides, then the pivot shaft structure can provide torque, but two ends of the pivot shaft will outward protrude requiring additional concealment design
Solution Approach 1:
The invention merges the torque provision function and the support function into a single integrated structure where the first support and second support are disposed at the ends of the pivot shaft rather than at the middle section. This consolidation eliminates the need for separate concealment designs for protruding ends, as the supports themselves form the external boundaries of the device.
Solution Approach 2:
Instead of placing the supports at the middle section of the pivot shaft as in conventional designs, the invention inverts the arrangement by positioning the first support and second support at the two ends of the pivot shaft. This inverted configuration naturally conceals the pivot shaft ends within the support structure, eliminating the need for additional concealment designs.
3Reliability
If multiple frictional members are alternately arranged in frictional contact, then the normal action force is distributed and wear is reduced, but the device structure becomes more complex
Solution Approach 1:
The frictional members are designed to serve multiple functions: they provide torque transmission through frictional contact, distribute the normal force to reduce wear, and simultaneously act as structural components that maintain the relative positions of the pivot shaft, recessed wheel, and raised wheel. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides adjustable torque and reduced wear, enhancing the device's functionality and aesthetics by minimizing external protrusions and distributing normal contact forces effectively.
Implementation Method 1
an elastic assembly fitted on one end of the pivot shaft distal from the first support, the elastic assembly serving to elastically fasten the adjustment wheel assembly and the frictional assembly
Implementation Method 2
the first and second frictional members, which are alternately arranged in frictional contact with each other for effectively distributing the normal action force between the first and second adjustment wheels so as to reduce the wear thereof
Data Source
AI summary
A torque-variable single-shaft rotary shaft structure with multiple frictional pairs includes a pivot shaft. A first support is secured to a pivot shaft and a second support is disposed on the pivot shaft. An adjustment wheel assembly, a frictional assembly and an elastic assembly are fitted on the pivot shaft. The adjustment wheel assembly and the frictional assembly have a first adjustment wheel and a second frictional member synchronously movable with the first support and a second adjustment wheel and a first frictional member synchronously movable with the second support. When the first and second supports are rotated, the first and second adjustment wheels are driven to contact and abut against each other so as to provide axial action forces. The frictional assembly has multiple first and second frictional members, which are alternately arranged in frictional contact with each other to form multiple frictional pairs.