Pushrod-type valve trains are still found in many engines. Since a vertical pushrod causes interference with the intake port, which reduces engine power, the pushrod is sometimes tilted to increase the available cross-sectional area of the intake port. In order to analyze this mechanism, a three-dimensional valve train model was developed. The model is then verified through experimention. Simulation and experimental results agree that valve train dynamic performance is not significantly affected by pushrod angles less than 20 degrees.
Issue Section:
Technical Papers
1.
Scholes
, G. E.
, 1922
, “Experiments on Cams and Poppet Valves
,” The Institution of Automobile Engineers
, 16
, Part II. pp. 325
–329
.2.
Olmstead
, E. H.
, and Taylor
, E. S.
, 1939
, “Poppet Valve Dynamics
,” J. Aeronaut. Sci.
, 6
, pp. 370
–375
.3.
Hrones
, J. A.
, 1948
, “An Analysis of the Dynamic Forces in a Cam-Driven System
,” Trans. ASME
, 70
, pp. 473
–482
.4.
Mitchell
, D. B.
, 1950
, “Tests on Dynamic Response of Cam-Follower Systems
,” Mech. Eng. (Am. Soc. Mech. Eng.)
, 72
, pp. 467
–471
.5.
Barkan
, P.
, 1953
, “Calculation of High-Speed Valve Motion with a Flexible Overhead Linkage
,” SAE Trans.
, 61
, pp. 687
–700
.6.
Mahig, J., 1970, “Spring and Follower Characteristics Due to Internal Damping and Cam Actuation,” ASME paper 70-Mech-76.
7.
Koster, M. P., 1974, “Effect of Flexibility of Driving Shaft on the Dynamic Behavior of a Cam Mechanism,” ASME paper 74-DET-48.
8.
Akiba, K., Shimizu, A., and Sakai, H., 1981, “A Comprehensive Simulation of High Speed Driven Valve Trains,” SAE Technical Paper 810865.
9.
Pisano
, A. P.
, and Freudenstein
, F.
, 1983
, “An Experimental and Analytical Investigation of the Dynamic Response of a High-Speed Cam-Follower System, Part 1 & 2
,” ASME Journal of Mechanisms, Transmissions, and Automation in Design
, 105
, pp. 699
–704
.10.
Kosugi, T., and Seino, T., 1985, “Valve Motion Simulation Method for High-Speed Internal Combustion Engines,” SAE Technical Paper 850179.
11.
Phlips, P. J., Schamel A. R., and Meyer J., 1989, “An Efficient Model for Valvetrain and Spring Dynamics,” SAE Technical Paper 890619.
12.
Kim, D., and David, J. W., 1990, “A Combined Model for High Speed Valve Train Dynamics (Partly Linear and Partly Nonlinear),” SAE Technical Paper 901726.
13.
Rob, J., and Arnold, M., 1993, “Analysis of Dynamic Interactions in Valve Train Systems of IC-Engines by Using a Simulation Model,” SAE Technical Paper 930616.
14.
David, J. W., and Kim, D., 1994, “Optimal Design of High Speed, Valve Train Systems,” SAE Technical Paper 942502
15.
Lee, J., and Patterson D. J., 1995, “Nonlinear Valve Train Dynamics Simulation with a Distributed Parameter Model of Valve Spring,” ASME publication, ICE-Vol. 23, Engine Modeling, pp. 51–58.
16.
David, J. W., Kelley, C. T., and Cheng, C. Y., 1996, “Use of an Implicit Filtering Algorithm for Mechanical System Parameter Identification,” SAE Technical Paper 960358.
17.
Gast, G. J., and David, J. W., 1996, “Pushrod Modeling and Valve Train Dynamics of High Speed IC Engines,” SAE Technical Paper 960352.
18.
Kim, D., 1990, “Dynamics and Optimal Design of High Speed Automotive Valve Trains,” PhD. Thesis, North Carolina State University, Raleigh, NC.
19.
Freudenstein
, F.
, Mayourian
, M.
, and Maki
, E. R.
, 1983
, “Energy Efficient Cam-Follower Systems
,” T ASME Journal of Mechanisms, Transmissions, and Automation in Design
, 105
, pp. 681
–685
.20.
Seidlitz S., 1989, “Valve Train Dynamics—A Computer Study,” SAE Technical Paper 890620.
Copyright © 2001
by ASME
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