Threaded Fastener Clamper Restraint for Preload Retention
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Solution Overview
Problem
Threaded fasteners experience relative angular displacement due to external factors, leading to axial displacement and loosening of the fastened objects, resulting in a reduction in preload.
Innovation Solution
A fastener system comprising a body with discontinuous raised ribs, a clamper with annular recesses, and a restraint that restricts the clamper's position, along with a supporting part that applies and transmits preload to the fastened object, limiting axial movement and maintaining the preload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded fastener is used to connect fastened objects, then the fastening function is achieved, but relative angular displacement causes axial displacement and loosening, reducing preload
Solution Approach 1:
The clamper is designed to rotate together with the threaded fastener during tightening, dynamically adapting to the fastener's angular position. The restraint mechanism then locks this dynamic position, preventing subsequent relative angular displacement and maintaining preload stability.
Solution Approach 2:
The clamper acts as an intermediary component between the threaded fastener and the fastened objects. It transfers and maintains the preload by mechanically coupling to the fastener's threads and restraining its rotational movement, thereby preventing axial displacement and loosening.
2Ease of operation
If the clamper is allowed to rotate freely with the fastener, then proper clamping engagement is achieved, but axial displacement occurs due to relative angular displacement
Solution Approach 1:
The system transitions from a static restraint to a dynamic one: the clamper rotates freely during initial engagement to achieve proper clamping, then the restraint mechanism activates to lock the position, preventing further angular and axial displacement while maintaining the achieved preload.
Solution Approach 2:
The clamper is designed to perform preliminary rotation and engagement with the fastener threads before the restraint mechanism activates. This preliminary action ensures proper clamping engagement, after which the restraint prevents any further displacement that would reduce preload.
Data Source
AI summary
This invention is a fastener. The fastener has a body, a clamper and a restraint. The body is provided with a coupling part, which comprises a discontinuous raised rib going around an outer surface of the coupling part; the clamper is fitted over the coupling part; a recess going around an inner surface of the clamper; the raised rib is fitted to the recess; the restraint is arranged to surround the clamper, so the restraint is capable of restricting the clamper in a certain position range of the body.