Designing passenger vehicle diesel engine cams with enhanced dynamic characteristics
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- Category: Content №6 2025
- Last Updated on 25 December 2025
- Published on 30 November -0001
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Authors:
I. F. Alrefo*, orcid.org/0000-0002-5626-7121, Al-Balqa Applied University, Al Salt, Jordan, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
M. O. Rawashdeh, orcid.org/0000-0001-7241-5000, Al-Balqa Applied University, Al Salt, Jordan, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
O. Matsulevych, orcid.org/0000-0001-5553-709X, Dmytro Motornyi Tavria State Agrotechnological University, Zaporizhzhia, Ukraine, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
O. Vershkov, orcid.org/0000-0001-5137-3235, Dmytro Motornyi Tavria State Agrotechnological University, Zaporizhzhia, Ukraine, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
S. Halko, orcid.org/0000-0001-7991-0311, Dmytro Motornyi Tavria State Agrotechnological University, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
O. Suprun, orcid.org/0000-0003-4369-712X, Dmytro Motornyi Tavria State Agrotechnological University, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2025, (6): 061 - 068
https://doi.org/10.33271/nvngu/2025-6/061
Abstract:
Purpose. Automating the design of working profiles for cam mechanisms in heavy-, medium- and light-duty internal combustion engines with enhanced dynamic characteristics.
Methodology. By applying discrete differentiation to the tabulated law of tappet displacement, non-oscillatory graphs for velocity and acceleration were obtained. These graphs served as the basis for determining the polar coordinates of the cam profile. The SolidWorks CAD system was employed to generate a 3D computer model of the camshaft with enhanced dynamic characteristics.
Findings. Tuning camshafts ensure the optimum supply of a full charge of the mixture to the cylinder by increasing the height and speed of valve lift. A notable characteristic of these camshafts is their ability to extend the threshold of detonation at lower crankshaft speeds. The cam profiles of these camshafts are characterised by exceptional smoothness, ensuring reliable operation of the valve timing mechanism. The performed calculations show that the tuning cam profile has a greater radius of curvature at the cam-tappet contact point compared to the conventional profile. This provides more favourable conditions for hydrodynamic oil wedge formation between the contact surfaces due to an increase in the hydrodynamic effective velocity.
Originality. Implementing a novel approach to camshaft design enabled the creation of tuning camshafts, ensuring optimal cylinder filling by maximising valve lift height and speed. A key original feature is their capacity to raise the detonation limit at lower RPMs, complemented by exceptionally smooth profiles that contribute to reliable valve timing.
Practical value. A universal methodology for profiling the functional surfaces of tuning camshafts intended for heavy-, medium- and light-duty engines has been developed, ensuring their operational reliability and durability.
Keywords: internal combustion engine, tuning camshaft, cam, valve timing mechanism
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