This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Automotive Cam Profile Synthesis and Valve Gear Dynamics from Dimensionless Analysis
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1966 by SAE International in United States
Annotation ability available
The Fourier Series is used in the development of a continuous function to express cam lifts and accelerations. The mathematics is extended to generate an acceleration response curve which includes the effect of valve linkage flexibility. When a standardized acceleration diagram is established, the variables can be summarized in dimensionless design parameters. Design charts for a parabolic-shaped acceleration curve, suitable for automotive applications, are included. The variables listed as dimensionless parameters include lift, half angle of event, ramp velocity, flow factor, maximum positive acceleration, maximum negative acceleration, acceleration positive pulse width, minimum tappet diameter, base circle diameter, and minimum radius of curvature. Methods of profile synthesis for unsymmetrical half angles of event and matching of profiles to flexible linkages are explained. A dimensionless design chart for valve springs is also included.
CitationErisman, R., "Automotive Cam Profile Synthesis and Valve Gear Dynamics from Dimensionless Analysis," SAE Technical Paper 660032, 1966, https://doi.org/10.4271/660032.
- Nourse, J. H. Dennis, R. C. and Wood, W. M. “Recent Developments in Cam Design.” SAE Progress in Technology, Vol. 5, “Application of Computers in Valve Gear Design” (1963).
- Beard C. A. and Hempson, J. G. G. “Problems in Valve Gear Design and Instrumentation.” SAE Progress in Technology, Vol. 5, “Application of Computers in Valve Gear Design” (1963).
- Johnson, G. I. “Studying Valve Dynamics With Electronic Computers.” SAE Progress in Technology, Vol. 5, “Application of Computers in Valve Gear Design” (1963).
- Hundal, M. S. “Aid of Digital Computer in the Analysis of Rigid Spring Loaded Valve Mechanisms.” SAE Progress in Technology, Vol. 5, “Application of Computers in Valve Gear Design” (1963).
- Dudley, W. M. “New Methods in Cam Design.” SAE Quarterly Trans., Vol. 2, No. 1 (January 1948), 19.
- Thoren, T. R. Engemann, H. H. and Stoddart, D. A. “Cam Design as Related to Valve Train Dynamics.” SAE Quarterly Trans., Vol. 6, No. 1 (January 1952), 1.
- Warming, T. “Dynamic Analysis of Valve Springs.” Proc. National Oil and Gas Power Conference, ASME, 1949.
- Olmstead E. H. and Taylor, E. S. “Poppet Valve Dynamics.” J. Aer. Sci., Vol. 6, July 1939.
- Horan, R. P. “Overhead Valve Gear Problems.” SAE Trans., Vol. 61 (1953), 678.
- Wylie, C. R. Jr., “Advanced Engineering Mathematics” (Text), McGraw-Hill Co., 95.
- Barkan, P. “Calculation of High Speed Valve Gear Motion with Flexible Overhead Linkage.” SAE Trans., Vol. 61 (1953), 687.
- Turkish, M. C. “Relationship of Valve-Spring Design to Valve Gear Dynamics and Hydraulic Lifter Pump-Up.” SAE Trans., Vol. 61 (1953), 706.
- Bishop, J. L. H. “An Analytical Approach to Automobile Valve Gear Design.” Proc. Inst. Mech. Eng., Automobile Div., Part IV (1950-1951), 150.
- Erisman, R. J. “Dimensionless Parameters for Helical Compression Springs.” ASME Trans., Series B, J. Engrg. for Industry, Vol. 82 (1960), 439.