Modelling the Valvetrain of the Car Engine to Study the Effects of Valve Rotation
Abstract
:Featured Application
Abstract
1. Introduction
2. Multibody Model of the Valvetrain System
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- Motion equation:
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- Natural frequency of the system:
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- Damping factor:
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- Critical damping coefficient, considering ζ = 1:
3. Results
3.1. Influence of Camshaft Rotation Speed
3.2. Influence of Friction Coefficient
3.3. Influence of the Cam Position to the Axis of Symmetry of the Tappet
3.4. Influence of the Spring
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Material 1 | Material 2 | Type of Contact | μ Static | μ Dinamic |
---|---|---|---|---|
Steel | Steel | dry-dry | 0.7 | 0.57 |
Steel | Steel | lubricating-dry | 0.23 | 0.16 |
Steel | Steel | Lubricating—lubricating | 0.23 | 0.16 |
Case No. | Bodies in Liaison | Rigidity [N/m] | Damping [Ns/m] |
---|---|---|---|
1 | Camshaft–Outer tappet housing | 7 × 107 | 420 |
2 | Tappet Housing–Valve | 4 × 107 | 250 |
3 | Valve–Valve seat | 10 × 107 | 520 |
4 | Valve–Valve retainer | 3 × 107 | 100 |
5 | Valve retainer–Spring retainer | 3 × 107 | 100 |
6 | Spring washer–Valve guide | 4 × 107 | 250 |
Free height | Ho [mm] | 44.5 |
Diameter | d [mm] | 4 |
External diameter | D [mm] | 28 |
Internal diameter | Di [mm] | 20 |
Average diameter | Dm [mm] | 24 |
The slope of the arch | α0 [°] | 6 |
Number of spirals | nt | 6.75 |
Spring Length [mm] | Spring 1 | Spring 2 | Spring 3 | Spring 4 | Average Force [N] | ||||
---|---|---|---|---|---|---|---|---|---|
Mass [kg] | Force [N] | Mass [kg] | Force [N] | Mass [kg] | Force [N] | Mass [kg] | Force [N] | ||
44.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
44 | 7 | 68.67 | 6 | 58.86 | 5.5 | 53.95 | 6.3 | 61.80 | 60.82 |
42 | 14 | 137.34 | 14 | 137.34 | 14 | 137.34 | 15 | 147.15 | 139.79 |
40 | 27.5 | 269.77 | 22.5 | 220.72 | 21 | 206.01 | 22.6 | 221.70 | 229.55 |
38 | 31 | 304.11 | 31.5 | 309.01 | 31.5 | 309.01 | 31 | 304.11 | 306.56 |
36 | 40.4 | 396.32 | 40 | 392.4 | 39.5 | 387.49 | 40 | 392.4 | 392.15 |
34 | 50 | 490.5 | 52.5 | 515.02 | 50.0 | 490.5 | 49 | 480.69 | 494.17 |
32 | 59.5 | 583.69 | 62.5 | 613.12 | 59.5 | 583.69 | 58.5 | 573.88 | 588.6 |
30 | 71 | 696.51 | 71 | 696.51 | 69.6 | 682.77 | 70 | 686.7 | 690.62 |
28 | 80.5 | 789.7 | 81 | 794.61 | 80 | 784.8 | 81 | 794.61 | 790.93 |
27 | 101 | 990.81 | 101 | 990.81 | 101 | 990.81 | 101 | 990.81 | 990.81 |
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Jelenschi, L.; Scutaru, M.L.; Marin, M.; Cofaru, C. Modelling the Valvetrain of the Car Engine to Study the Effects of Valve Rotation. Appl. Sci. 2022, 12, 3393. https://doi.org/10.3390/app12073393
Jelenschi L, Scutaru ML, Marin M, Cofaru C. Modelling the Valvetrain of the Car Engine to Study the Effects of Valve Rotation. Applied Sciences. 2022; 12(7):3393. https://doi.org/10.3390/app12073393
Chicago/Turabian StyleJelenschi, Liviu, Maria Luminita Scutaru, Marin Marin, and Corneliu Cofaru. 2022. "Modelling the Valvetrain of the Car Engine to Study the Effects of Valve Rotation" Applied Sciences 12, no. 7: 3393. https://doi.org/10.3390/app12073393