Eccentric Double-Shear Fastener for Misalignment-Free Assembly
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Solution Overview
Problem
Existing connecting devices fail to quickly and cleanly assemble mechanical components with play due to imperfect geometries and misalignments, requiring adjustment operations or drillings.
Innovation Solution
A connecting device featuring an eccentric pin and eccentric sleeves with adjustable tolerance, allowing rotational positioning to compensate for play between mechanical components, secured by blocking elements, enabling a clean and quick assembly without adjustments or drillings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional connecting devices are used to assemble mechanical components with play, then the assembly operation becomes complex requiring adjustment operations or drillings, but the connection quality improves
Solution Approach 1:
The patent changes the geometric parameters of the connecting device by introducing eccentricity in the pin and sleeves. The eccentric pin has its rotation axis offset from the centerline, and the eccentric sleeves have their inner and outer surface axes offset. This parameter change allows the device to compensate for misalignments and play between components while maintaining fast assembly without adjustments or drillings.
2Reliability
If conventional connecting devices are used to assemble mechanical components with play, then the assembly process requires adjustment operations or drillings, but the connection becomes secure
Solution Approach 1:
The eccentric connecting device is designed to self-adjust and self-align during the assembly process. The eccentric geometry automatically compensates for play and misalignments between components as the parts are brought together, eliminating the need for external adjustment operations or drillings. The device serves itself to achieve secure connection without requiring complex assembly procedures.
3Manufacturing precision
If conventional connecting devices are used, then the assembly requires adjustment operations or drillings to achieve clean connection, but the manufacturing time increases
Solution Approach 1:
The eccentric geometry of the pin and sleeves is pre-configured during manufacturing to anticipate and compensate for potential misalignments and play between components. This preliminary design feature is built into the device itself, so that during assembly, no additional adjustment operations or drillings are needed. The clean connection is achieved automatically through the pre-engineered eccentric geometry, saving manufacturing time.
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 device allows for a fast, clean connection that compensates for play between mechanical components, ensuring a secure assembly without the need for adjustments or drillings, facilitating efficient assembly in applications like aircraft manufacturing.
Implementation Method 1
an eccentric pin comprising at least first and second coaxial cylindrical sections having a first axis of revolution and, between these first and second cylindrical sections, a third cylindrical section having a second axis of revolution, the first and second axes of revolution being different
Data Source
AI summary
A double shear attachment device with an eccentric axis and eccentric sleeves, mechanical assembly including such a device and assembling process. The attachment device comprises an eccentric axis and two eccentric sleeves to mount on the eccentric axis to correct, by an appropriate positioning in rotation of the eccentric sleeves on the eccentric axis, the possible clearances between superposed circular holes of mechanical components that have to be linked together by the attachment device, the attachment device including also blocking structure configured to block in rotation the eccentric sleeves, the attachment device thus allowing to generate a quick and clear attachment, that is able to correct clearances locally.