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TECHNICAL PAPERS

Quasi-Kinematic Couplings for Low-Cost Precision Alignment of High-Volume Assemblies

[+] Author and Article Information
Martin L. Culpepper

Precision Systems Design & Manufacturing Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139e-mail: culpepper@mit.edu

Alexander H. Slocum

Precision Engineering Research Group, Massachusetts Institute of Technology, Cambridge, MA 02139e-mail: slocum@mit.edu

F. Zafar Shaikh, Gary Vrsek

Scientific Research Laboratory, Ford Motor Company, Dearborn, MI 48120

J. Mech. Des 126(3), 456-463 (Nov 01, 2003) (8 pages) doi:10.1115/1.1701882 History: Received September 01, 2002; Revised November 01, 2003
Copyright © 2004 by ASME
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References

Figures

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Common types of kinematic couplings
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Quasi-kinematic coupling (contact arcs shown as dotted lines)
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Mating cycle of a QKC joint
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QKC joint designs and corresponding contact imprint patterns
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Case study: Duratec™ engine’s journal bearing alignment
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Cross section through conventional journal bearing assembly (Section A-A in Fig. 5b)
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Assembly error loads on the bedplate and their position/orientation of application
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Position and orientation of QKC joints in the Duratec engine’s block and bedplate
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Form tool used with cast features to make a groove with side-reliefs and a thru-hole
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Stiffness characteristics of a Duratec QKC joint
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Test stand for Duratec alignment experiments
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Alignment hysteresis at journals 1 and 4 for competing QKC joint designs
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Kinematic elements after 60,000 miles in test car
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Results of statistical alignment analysis (α=1)
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Statistical analysis spread sheet

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