This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Variable-Stroke Engine
Annotation ability available
Sector:
Language:
English
Abstract
A new type of variable-stroke engine, or compressor, is presented in this paper. The stroke is adjusted by changing the length of the ground link using an auxiliary mechanism. Adjusting the ground link, changes the rotation angle and the effective length of the connecting rod, which in turn controls the pumping volume of the engine. The pumping action is caused by the motion of the piston which oscillates relative to the frame as the input crank rotates through a complete cycle. The motion of the piston induces a transverse force and a bending moment in the connecting rod but no axial force or static buckling load. Since swirl combustion is known to improve thermal efficiency, this variable-stroke engine was designed to induce high swirl rates. It is believed that this type of variable-stroke engine has not previously appeared in the literature and so a complete kinematic and dynamic force analysis is included in the paper.
Authors
Citation
Pennock, G. and Beard, J., "A Variable-Stroke Engine," SAE Technical Paper 880577, 1988, https://doi.org/10.4271/880577.Also In
References
- Beard, J. E. Hall, A. S., Jr. Soedel, W. “On The Classification of Compressor, Pump or Engine Designs Using Generalized Linkages,” Proceedings of the 1982 Purdue Compressor Technology Conference July 21-23 1982 166 172
- Ferguson, C. R. Internal Combustion Engines, Applied Thermosciences John Wiley and Sons 1986 45 47
- Freudenstein, F. Maki, E. R. “Development of an Optimum Variable Internal-Combustion Engine Mechanism From the Viewpoint of Kinematic Structure,” Journal of Mechanisms, Transmissions, and Automation in Design Trans. ASME 105 2 June 1983 259 266
- Hall, A. S., Jr. Mechanism Analysis Balt Publishers Lafayette, Indiana 1981
- Pouliot, H. N. Delameter, W. R. Robinson, C. W. “A Variable Displacement Spark-Ignition Engine,” International Automotive Engineering, Congress and Exposition Detroit SAE Paper No. 770114 February 28 March 4 1977
- Reuleaux, F. The Kinematics of Machinery Macmillan, London 1963
- Setright, L. J. K. Some Unusual Engines Mechanical Engineering Publishing Ltd. I. Mech. E. London 1975
- Siegla, D. C. Siewert, R. M. “The Variable Stroke Engine - Problems and Promises,” Society of Automotive Engineers, West Coast Meeting San Diego August 7-10 1978 Technical Paper Series, Paper No. 780700
- Welsh, H. W. Riley, C. T. “The Variable Displacement Engine: An Advanced Concept Power Plant,” Paper 710830 SAE National Combined Fuels and Lubricants, Powerplant and Truck Meetings St. Louis October 26-29 1971