Dual-Shaft Parallelism Fixing Device with 8-Shaped Unit
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Solution Overview
Problem
Conventional pivot pin structures and rotary shafts in dual-shaft systems face challenges in maintaining parallelism, leading to deflection issues during rotation, which complicates assembly and increases manufacturing costs due to the need for high precision in assembling retainer rings and plates.
Innovation Solution
A parallelism fixing device comprising first and second rotary shafts with a fixing unit, featuring a substantially 8-shaped cross section with chambers and a link unit, minimizes deflection by synchronously rotating the shafts and stabilizing their parallelism through a torque module with spring gaskets and fixing plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If retainer rings and retainer plates are assembled at two ends of the rotary shaft with high precision, then the parallelism of the two rotary shafts is maintained, but the difficulty in assembling and processing increases and manufacturing cost increases
Solution Approach 1:
A fixing device is introduced as an intermediary component between the two rotary shafts. This fixing device includes a fixing body with a through hole and a fixing protrusion that engages with corresponding structures on the rotary shafts, serving as a mediator to maintain parallelism without requiring high-precision assembly of the shafts themselves
Solution Approach 2:
The fixing device uses a standardized structure that can be replicated and applied to different rotary shaft assemblies. The fixing body with its specific geometry (through hole and protrusion) creates a reusable template for maintaining parallelism across multiple assemblies, reducing the need for custom high-precision work
2Manufacturing precision
If retainer rings and retainer plates are assembled at two ends of the rotary shaft with high precision, then the parallelism of the two rotary shafts is maintained, but the manufacturing cost increases
Solution Approach 1:
The fixing device employs simple, easily manufactured components (fixing body, through hole, protrusion) that can be produced at low cost. Rather than investing in expensive high-precision machining for the rotary shafts themselves, the solution uses inexpensive fixing elements that achieve the parallelism function without requiring costly manufacturing processes
Solution Approach 2:
By introducing the fixing device as an intermediary, the need for expensive high-precision assembly equipment and processes is eliminated. The fixing device performs the parallelism-maintaining function through its simple geometry, allowing standard manufacturing processes to be used throughout
3Ease of operation
If the fixed end of the rotary shaft serves as a rotational support point, then the rotary shaft can rotate, but the other end or the pivoted end of the rotary shaft deflects
Solution Approach 1:
The fixing device acts as an intermediary that connects both rotary shafts and maintains their parallel alignment during rotation. The fixing body with its through hole and protrusion structure provides a stable reference framework that prevents deflection while allowing the shafts to rotate freely
Solution Approach 2:
The fixing device uses an asymmetric structure where the fixing body has a specific orientation with the through hole and protrusion positioned to engage with the rotary shafts in a way that maintains parallelism. This asymmetric geometry provides directional stability during rotation
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 effectively maintains the parallelism of rotary shafts during rotation, simplifies the assembly process, and reduces manufacturing costs by eliminating the need for high-precision assembly of components.
Implementation Method 1
a torque module composed of multiple gaskets with through holes and recessed/raised locating sections and multiple frictional plates
Implementation Method 2
multiple gaskets with through holes and recessed/raised locating sections and multiple frictional plates
Data Source
AI summary
A parallelism fixing device applied to dual-shaft system for fixing the parallelism of the rotary shafts and facilitating the assembling process. The parallelism fixing device includes a first rotary shaft, a second rotary shaft and a fixing unit, which are assembled with each other. Each of the first and second rotary shafts has a fixed section mounted on an electronic apparatus, a pivoted section assembled with a torque module and a middle section positioned between the fixed section and the pivoted section. The fixing unit is assembled with the middle sections. The fixing unit has a substantially 8-shaped cross section and includes a first chamber, a second chamber and a belly section in connection with the first and second chambers. The middle sections of the first and second rotary shafts are respectively fixedly assembled in the first and second chambers.