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Technical Briefs

Involute-Based Screw Driver Profiles With High Load Capacity

[+] Author and Article Information
Shih-Hsi Tong

 Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095-1597shihhsi@yahoo.com

Daniel C. H. Yang

 Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095-1597dyang@seas.ucla.edu

J. Mech. Des 134(3), 034501 (Feb 18, 2012) (4 pages) doi:10.1115/1.4005618 History: Received March 02, 2011; Revised December 02, 2011; Published February 17, 2012; Online February 18, 2012

In this paper, involute profiles are used for the design of screw driver and screw heads instead of traditional straight line profiles to increase their load capacity and durability. New screw driver profiles have lower contact stress than traditional screw drivers due to the surface contact between screw driver and screw head. This enables the involute screw drivers to sustain higher load capacity than traditional screw drivers and reduce the material failure at the tip portions for both screw drivers and screw heads. Four different designs of screw driver profiles are provided for illustration.

FIGURES IN THIS ARTICLE
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Copyright © 2012 by American Society of Mechanical Engineers
Topics: Screws , Stress , Design
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References

Figures

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Figure 1

Traditional screw heads

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Figure 2

Contact patterns between screw driver and screw head

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Figure 4

4-Tooth single-stage involute drive pattern

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Figure 5

4-tooth multistage involute drive pattern

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Figure 6

3D solid of 3-tooth multistage involute drive pattern with lofted cone profile

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Figure 7

Possible variation of 4-tooth involute drive pattern

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Figure 8

Another possible variation of 4-tooth involute drive pattern

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Figure 9

3D solid of design case 4 with prismatic cross-section

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