Multi-Point Threaded Fastener Profile for Vibration Resistance
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Solution Overview
Problem
Existing threaded fasteners often loosen under vibration and may strip easily during installation, leading to reduced clamping and premature assembly failure, especially in applications requiring high vibration resistance, and they often require additional coatings like nylon patches which increase costs and complexity.
Innovation Solution
A threaded fastener design featuring a threaded portion with specific angle configurations for the crest, leading flank, root, and trailing flank, providing multi-point contact with a mating thread to enhance vibration resistance, thereby reducing the need for additional coatings and improving clamping forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional threaded fasteners are used, then installation is simple, but they loosen under vibration and fail prematurely
Solution Approach 1:
The thread profile employs asymmetric angle configurations where the leading flank angle (20°-30°) and trailing flank angle (15°-25°) differ, creating unequal load distribution that enhances vibration resistance while maintaining installation simplicity
Solution Approach 2:
The invention modifies standard thread parameters by adjusting the crest portion angle (10°-20°), root portion angle (25°-35°), and flank angles to achieve multi-point contact, thereby improving vibration resistance without adding coatings or complex structures
2Reliability
If thread coatings like nylon patches are applied, then vibration resistance improves, but material cost and application cost increase
Solution Approach 1:
The invention extracts and eliminates the need for external thread coatings by integrating vibration resistance directly into the fastener's thread geometry through optimized angle configurations, thereby reducing material and application costs
Solution Approach 2:
The fastener's own thread profile serves the dual function of fastening and vibration resistance through its asymmetric geometry, making the system self-sufficient without requiring additional coating materials or application processes
3Ease of manufacture
If standard thread profiles are used, then manufacturing is simple, but they strip easily during installation
Solution Approach 1:
The thread profile applies localized quality variations through different angle configurations in specific regions: the crest portion (10°-20°) and root portion (25°-35°) have optimized angles that locally enhance strength and distribute installation loads more effectively
Solution Approach 2:
The thread structure creates a composite effect through multi-point contact geometry, where the interaction between the asymmetric flanks and mating thread surfaces generates enhanced mechanical interlocking that resists stripping during installation
4Reliability
If multi-point contact thread profile is implemented, then vibration resistance improves, but thread geometry complexity increases
Solution Approach 1:
The thread profile is segmented into distinct functional portions with specific angle ranges: crest portion (10°-20°), leading flank (20°-30°), root portion (25°-35°), and trailing flank (15°-25°), where each segment contributes to multi-point contact and vibration resistance
Data Source
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AI summary
Disclosed are new thread profiles that provide multi-point contact improving the vibration resistance of the threaded fastener, and thereby greatly reducing the need for fastener coatings, such as nylon patches. In various embodiments, the threaded faster may have a threaded portion configured to engage two or three points of a mating thread, and the threaded portion has a thread defined by a crest portion, a leading flank, at least one root portion, and a trailing flank, all of which may be oriented at angle relative to the normal axis.