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TECHNICAL PAPERS

Valve Gear Refinement

[+] Author and Article Information
Jurij Avsec, Milan Marcic, Maks Oblak

University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, P.O. BOX 224, Slovenia

J. Mech. Des 124(1), 86-90 (Feb 01, 2000) (5 pages) doi:10.1115/1.1425812 History: Received February 01, 2000
Copyright © 2002 by ASME
Topics: Gears , Valves , Design
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References

Kahrs,  M., 1995, “Hydraulische Verstellungen für Variable Ventiltriebe,” Motortech. Z., 56, No. 7/8, pp. 413–417.
Bensinger, W., 1995, Die Steuerung des Gaswechsels in Schnelllaufenden Verbrennungsmotoren, Springer, Berlin.
Küntscher, V., 1987, “Kraftfahrzeugmotoren,” VEB Verlag Technik Berlin.
Kümpel,  G., 1986, “Anwendung der Elastohydrodinamik auf Nocken-Stössel Systeme,” Tribologi-Schmierungstechnik, 33, No. 5, pp. 299–308.
Williamson, B. P., and Bell, J. C., “The Effects of Engine Oil Rheology on the Oil Film Thickness and Wear Between a Cam and Rocker Follower,” SAE 962031.
1998, “Die Verbrennungsentwicklung der neuen Mercedes-Benz Nutzfahrzeug, Dieselmotoren OM 442A und OM 442LA,” ATZ (Automobiltechnische Zeitschrift), 98, No. 2, pp. 23–54.
Hardenberg,  H., 1969, “Die Berechnung des freien Öffnungquerschnittes von Kegelventileen,” Motortech. Z., 30, No. 2, pp. 59–64.
Kanesaka, H., Ahila, K., and Sahai, H., “A New Method of Valve Cam Design HYSDYNE CAM,” SAE 770777.
Stochowiak, G. W., and Batchelor, A. W., 1993, Engineering Tribology, Elsevier, Amsterdam.

Figures

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Acceleration diagram for new cam MULTICAM
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Comparison of cam profiles
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Cam velocity, acceleration, lift
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Radius of curvature of cam
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Hertz pressures between cam and cam follower at 500 rpm of camshaft (at idling)
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Hertz pressures between cam and cam follower at 2800 rpm (exceeded by 30 %)
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Geometrical cross sections of valves 7
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Coefficient of lubrication (KM=vHD
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Ratio between inertia and spring force at 2800 rpm.

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