Self-Locking Nut With Ridges And Tabs Prevents Backing Off
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Solution Overview
Problem
Conventional nuts are prone to loosening during use, known as 'backing off,' which can lead to accidents, especially in applications like securing a truck's wheel-end, as they fail to provide adequate resistance against rotation.
Innovation Solution
A self-locking nut design featuring a washer with a locking feature comprising ridges and locking tabs that slidably couple with the nut, providing resistance to rotation and preventing loosening by engaging with the washer's ridges, allowing for secure attachment without additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional nut is used, then the structure is simple, but the nut is prone to loosening during use
Solution Approach 1:
The patent combines multiple functional components (nut body, locking tabs, ridges, and engagement features) into a single integrated self-locking nut assembly. The locking tabs are formed as integral parts of the nut body, and the ridges are molded into the nut structure, creating a unified component that provides both fastening and locking functions simultaneously, thereby improving reliability without requiring separate locking mechanisms
Solution Approach 2:
The nut body is divided into distinct functional segments including locking tabs with engagement features and ridges with specific geometries. Each segment performs a specific function: the locking tabs provide rotational resistance, the ridges guide assembly and provide structural support, and the engagement features interact with corresponding features on the fastened component. This segmentation allows each part to be optimized for its specific function while working together as a cohesive system
2Reliability
If a self-locking mechanism is added to prevent loosening, then reliability improves, but device complexity increases
Solution Approach 1:
The self-locking nut is designed to automatically lock itself during the tightening process without requiring additional tools, components, or manual intervention. As the nut is threaded onto the fastener, the locking tabs automatically engage with the ridges on the fastened component, and the engagement features interact with corresponding features to create a self-locking mechanism that prevents backing off solely through the act of tightening, thereby improving reliability without adding complex external locking devices
Solution Approach 2:
The locking tabs and engagement features are pre-configured in specific positions and orientations during manufacturing. The geometry of the locking tabs, ridges, and engagement features is predetermined to ensure that when the nut is tightened, the locking action occurs automatically at the appropriate moment. This preliminary configuration of locking elements ensures reliable self-locking behavior without requiring complex control mechanisms or additional components during operation
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 self-locking nut effectively prevents unintended loosening by providing directional resistance through the interaction of locking tabs and ridges, ensuring the nut remains securely attached even under operational stress, thus enhancing safety and reliability.
Implementation Method 1
locking tabs for slidably coupling the nut to the washer and engaging with the locking feature to resist rotation of the nut with respect to the washer
Data Source
AI summary
A self-locking nut includes a nut; a washer having a locking feature, the locking feature having a plurality of ridges; and at least one locking tab for slidably coupling the nut to the washer and engaging with the locking feature to resist rotation of the nut with respect to the washer.