Offset Dual-Cylinder Pin for Shear Load Transfer and Retention
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Solution Overview
Problem
Conventional pins used in mechanical assemblies often become loose or slide out of position when significant forces are applied, due to inadequate fixation methods such as soldering, which can lead to mechanical failure.
Innovation Solution
A pin design featuring two cylindrical portions with a common end plane and offset areas that provide structural integrity and locking mechanisms, allowing for precise placement and effective force transmission through shear forces, preventing the pin from sliding out of its lodgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pins are used with soldering or simple fixation, then the pin can be easily installed, but the pin becomes loose or slides out when significant forces are applied
Solution Approach 1:
The pin is divided into multiple cylindrical portions (first cylindrical portion, second cylindrical portion, third cylindrical portion) with different diameters and functions. Each portion serves a specific purpose: the first portion fits in the first plate with a gap for shock absorption, the second portion fits in the second plate for primary load bearing, and the third portion provides additional locking. This segmentation allows the pin to handle significant forces while maintaining ease of installation.
Solution Approach 2:
The pin features asymmetric cylindrical portions with different diameters along its length. The first cylindrical portion has a larger diameter than the second cylindrical portion, creating an asymmetric profile that provides different clearance characteristics in each plate. This asymmetry enables the pin to be retained in both plates simultaneously with appropriate gaps for shock absorption while maintaining structural integrity under load.
2Reliability
If the pin is tightly fitted in both plates, then the pin is securely positioned, but the pin cannot effectively transmit shear forces from shock loads
Solution Approach 1:
Different regions of the pin have different clearance characteristics. The first cylindrical portion has a larger diameter creating a gap with the first plate, allowing shock absorption and shear force transmission. The second cylindrical portion has a smaller diameter for a tighter fit in the second plate, providing positioning stability. This local differentiation of clearance quality enables the pin to simultaneously achieve secure positioning and effective shear force transmission.
Solution Approach 2:
The first cylindrical portion is designed with a larger diameter than the second cylindrical portion, creating a predetermined gap between the first cylindrical portion and the first plate. This gap acts as a cushion that absorbs shock loads and allows the pin to transmit shear forces effectively without being constrained by a tight fit, while the second cylindrical portion maintains positioning stability.
3Ease of manufacture
If the pin has a single cylindrical shape, then the manufacturing is simple, but the pin cannot provide both centering and locking functions
Solution Approach 1:
The pin is designed as a single multi-functional element with three distinct cylindrical portions. The first cylindrical portion provides shock absorption and shear force transmission, the second cylindrical portion provides positioning stability, and the third cylindrical portion provides additional locking. This multi-functionality is achieved within a single pin component, maintaining manufacturing simplicity while providing versatile functionality that a single cylindrical shape cannot achieve.
Data Source
AI summary
A system, including a pin having a first cylindrical portion defining a first central axis and a second cylindrical portion defining a second central axis that is parallel to and offset from the first central axis, a first plate with a first aperture matching with the cross section of the first cylindrical portion; a second plate with a second aperture matching with the cross section of the second cylindrical portion, the second plate lying against the first plate where the first cylindrical portion of the pin is inserted in the first aperture and includes a first surface that axially abuts against the second plate and wherein the second cylindrical portion of the pin is inserted in the second aperture and includes a second surface that axially abuts against the first plate.