Left-Right Screw Fastening Structure for Vibration Locking
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Solution Overview
Problem
Conventional fastening structures using bolts and nuts often loosen due to vibration, and existing methods with left-right screw intersection forming bolts lack reliability and complexity in preventing screw loosening.
Innovation Solution
A fastening structure that uses a left-right screw intersection forming bolt with a right screw nut, an elastic member having a rotation-preventing protrusion and tongue portion, and a left screw nut with a tapered surface, where the elastic member is tightened between the nuts to prevent rotation, ensuring secure fastening without complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional bolts and nuts are used for fastening, then the fastening structure is simple, but the fastening portion loosens due to vibration
Solution Approach 1:
The fastening system is segmented into multiple functional components: a left screw nut with external thread, a right screw nut with internal thread, and an elastic member with rotation-preventing protrusions. This segmentation allows each component to perform a specific function - the nuts provide fastening force while the elastic member prevents rotation, resolving the contradiction between simplicity and reliability
Solution Approach 2:
The elastic member acts as an intermediary between the left and right screw nuts. It transmits the tightening force from the left nut to the right nut while simultaneously preventing rotation through its rotation-preventing protrusions. This intermediary component enables reliable vibration-resistant fastening without requiring a complex integrated structure
2Reliability
If left-right screw intersection forming bolt with elastic member is used, then loosening is prevented, but the structure becomes too complicated
Solution Approach 1:
The elastic member incorporates local quality features - rotation-preventing protrusions at specific locations that engage with corresponding features on the nuts. This localized anti-rotation mechanism provides reliable loosening prevention without requiring the entire structure to be complex. The rest of the fastening system maintains simple nut-and-bolt geometry
Solution Approach 2:
The fastening system uses asymmetric threading - a left-handed screw on the bolt shaft and a right-handed screw on the nut interior. This asymmetric configuration, combined with the elastic member's rotation-preventing protrusions, creates a mechanically interlocked system that prevents loosening while maintaining overall structural simplicity through the use of standard nut and bolt forms
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 structure effectively prevents loosening, allows for easy unfastening, and can be reused, providing a reliable and straightforward method for securing the bolt without the need for excessive complexity.
Implementation Method 1
an elastic member (3) having a rotation-preventing protrusion (3a) and a tongue portion (3b)
Data Source
AI summary
To provide a fastening structure for fastening a left-right screw intersection forming bolt, which has a simple structure and does not loosen. A right screw nut having a recess, an elastic member having a rotation-preventing protrusion and a tongue portion, and a left screw nut having a tapered surface and a recess are included. After the bolt is tightened with the right screw nut and the elastic member is mounted, the tongue portion of the elastic member is tightened while being pressed with the left screw nut, so that the tongue portion jumps up to the recess of the left screw nut, and the left screw nut is locked and fastened. As illustrated in FIG. 9, the fastening structure can also be configured by changing the right screw nut to a left screw nut, the elastic member to an elastic member, and the left screw nut to a right screw nut.