A Novel Prevailing Torque Threaded Fastener and Its Analysis

Ranjan, BSC and Vikranth, HN and Ghosal, Ashitava (2013) A Novel Prevailing Torque Threaded Fastener and Its Analysis. In: JOURNAL OF MECHANICAL DESIGN, 135 (10).

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Abstract

We present a novel concept of a threaded fastener that is resistant to loosening under vibration. The anti-loosening feature does not use any additional element and is based on modifying the geometry of the thread in the bolt. In a normal nut and bolt combination, the axial motion of the nut or bolt is linearly related to the rotation by a constant pitch. In the proposed concept, the axial motion in the bolt is chosen to be a cubic function of the rotation, while for the nut, the axial motion remains linearly related to the rotation. This mismatch results in interference during the tightening process and additional torque required to overcome this interference gives rise to the enhanced anti-loosening property. In addition, the cubic curve is designed to ensure that the mismatch results in stresses and deformation in the elastic region of the chosen material. This ensures that the nut can be removed and reused while maintaining a repeatable anti-loosening property in the threaded fastener. A finite element analysis demonstrates the feasibility of this concept.

Item Type:	Journal Article
Publication:	JOURNAL OF MECHANICAL DESIGN
Publisher:	ASME
Additional Information:	Copyright for their article belongs to ASME, TWO PARK AVE, NEW YORK, NY 10016-5990 USA
Keywords:	threaded fasteners; loosening; cubic curve; interference; prevailing torque
Department/Centre:	Division of Mechanical Sciences > Centre for Product Design & Manufacturing Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	16 Dec 2013 06:30
Last Modified:	16 Dec 2013 06:31
URI:	http://eprints.iisc.ac.in/id/eprint/47895

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