Dual-Nut Locking Assembly for Precise Bolt Tension Under Vibration

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Solution Overview

Problem

Existing locking nuts in bolted joints struggle to maintain precise tension due to vibrational forces, making it difficult to secure them in the exact position.

Innovation Solution

A nut locking assembly comprising a first nut, a second nut, and a locking structure interposed between them, with aligned internal threading and recessed portions to prevent separation and compression, allowing simultaneous wrench engagement for precise positioning and tension maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a locking nut is used to prevent loosening under vibrational forces, then the reliability of the bolted joint is improved, but the manufacturing precision and ease of positioning the nut in the exact desired position deteriorates

Engineering Contradiction:
Improvejoint stabilityVSAvoidpositioning precision
Core Design Contradiction:
ReliabilityVSManufacturing precision

Solution Approach 1:

The locking nut is divided into two separate nuts: a first locking nut and a second locking nut. Each nut has its own recessed portion and internal threading. This segmentation allows each nut to be independently positioned and secured, enabling precise positioning of the first nut while the second nut provides additional locking. The separation resolves the contradiction by allowing precise positioning (improving manufacturing precision) while maintaining joint stability through the dual-nut locking mechanism (preserving reliability).

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The bolt serves as an intermediary element between the two locking nuts. The bolt threads through both nuts, and the internal threadings of both nuts are substantially aligned, allowing them to be secured to the same bolt. This intermediary connection enables the first nut to be positioned with precision while the second nut provides additional locking force, resolving the contradiction between positioning precision and joint stability.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If a locking nut is used to maintain tension, then the reliability is improved, but the device complexity increases due to additional components and installation steps

Engineering Contradiction:
Improvetension maintenanceVSAvoidassembly complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The locking function is segmented into two separate nuts, each with its own recessed portion for tool engagement. This segmentation allows the nuts to be installed and secured independently, providing redundancy for tension maintenance (improving reliability) while keeping each individual nut relatively simple in design (managing device complexity).

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Both the first and second locking nuts serve multiple functions: they provide locking force to prevent loosening under vibration, maintain tension on the bolted joint, and can be independently positioned using a wrench engaged with their respective recessed portions. This multi-functionality improves reliability through redundant locking mechanisms while the standardized design of both nuts helps manage assembly complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260009421A1Jam nut assembly
Publication Date: 2026.01.08 DASH LLC
  • US20260009421A1 patent drawing
  • US20260009421A1 patent drawing
  • US20260009421A1 patent drawing

AI summary

A nut locking assembly is disclosed. The nut locking assembly includes a locking structure, a first nut, and a second nut. The first nut includes a first body, a first nut internal threading formed in the first body, and a first nut recessed portion formed in the first body. The first nut recessed portion receiving a first end of the locking structure therein. The second nut including a second body, a second nut internal threading formed in the second body, and a second nut recessed portion formed in the second body. The second nut recessed portion receiving a second end of the locking structure therein. The second nut internal threading substantially aligns with the first nut internal threading.