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A Study of Wear in Engine Exhaust Valve Depending on Valve Materials Using a Laboratory Simulator
Technical Paper
2007-01-0944
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Engine valve and seat insert wear is one of the most important factors affecting engine performance. The engine valve and seat insert must be able to withstand the severe environment that is created by: high temperature exhaust gases generated while the engine is running, rapid movement of the valve spring, high pressure generated in the explosive process. In order to study such problems, a simulator has been developed to generate and control high temperatures and various speeds during motion. The wear simulator is considered to be a valid simulation of the engine valve and seat insert wear process with various speeds during engine activity.
This work focuses on the various degrees of wear of five different test exhaust valve materials such as HRV40, STL #6, STL #32, HRV40-FNV (face nitrided valve), NBW-FNV (face nitrided valve). Throughout all tests performed in this study, the outer surface temperature of the seat insert was controlled at 350°C, the cycle number was 4.0×106, the test load was 6860N, the fuel was LPG, the test speed was 20Hz (2400RPM) and the seat insert material was HVS1-2.
The mean (standard deviation) maximum roughness of the exhaust valve and seat insert was 25.44 (3.16) μm and 27.53 (3.60) μm at the HRV40, 36.73 (8.98) μm and 61.38 (7.84) μm at the STL #32, 73.64 (23.80) μm and 60.80 (13.49) μm at the STL #6, respectively. The mean (standard deviation) maximum roughness of the face nitrided exhaust valve and seat insert was 21.88 (2.38) μm and 25.94 (3.07) μm at the HRV40-FNV, 24.52 (2.77) μm and 40.38 (11.33) μm at the NBW-FNV, respectively.
It was discovered that the maximum roughness of exhaust valve was lower as the high temperature hardness of the valve material was higher under the same test conditions such as temperature, test speed, cycle number, test load and seat insert material. The set of the HRV40-FNV exhaust valve and the HVS1-2 seat insert group showed the best wear resistance.
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Authors
- Keyoung Jin Chun - Korea Institute of Industrial Technology
- Yang Soo Kim - Korea Institute of Industrial Technology
- Jae Soo Hong - Korea Institute of Industrial Technology
- Jae Hak Kim - Korea Institute of Industrial Technology
- Sung Jeon Hyung - Anjun Industrial Co., Ltd.
- Chung Sik Shin - Anjun Industrial Co., Ltd.
Citation
Chun, K., Kim, Y., Hong, J., Kim, J. et al., "A Study of Wear in Engine Exhaust Valve Depending on Valve Materials Using a Laboratory Simulator," SAE Technical Paper 2007-01-0944, 2007, https://doi.org/10.4271/2007-01-0944.Also In
References
- 1 Kim E. S. et al. “Automobile Technology Handbook,” Korean Society of Automobile Engineers 1966
- Chun K. J. Hong J. S. “A Study on Wear of Engine Valve and Seat Insert Depending on Speed Change” Korean Society of Automobile Engineers 6 11 14 20 2003
- Chun K. J. Hong J. S. Kim J. H. Hyung S. J. Shin C. S. “Comparison of Wears in the Engine Valve and Seat Insert Depending on Valve Materials,” IPC-13 26 2005
- Lewis R. Dwyer-Joyce R.S. Josey G. “Investigation of Wear Mechanisms Occurring in Passenger Car Diesel Engine Inlet Valves and Sear Inserts” SAE Paper 1999-01-1216 1999
- Chun K. J. Hong J. S. Lee H. J. “A Study on Engine Valve and Seat Insert Wearing Depending on Speed Change,” SAE International 2004-01-1655 2004
- Giles W. “Valve Problems with Lead Free Gasoline,” SAE Technical Paper 710368 1971
- Kimihiko A. Akira M. Akio Y. “Hardfaced Valve and P/M Valve Seat System for CNG and LPG Fuel Engines,” SAE Technical Paper 2005-01-0718 2005
- Godfrey D. Courtney R. L. “Investigation of the Mechanism of Exhaust Valve Seat Wear in Engines Run on Unleaded Gasoline,” SAE Technical Paper 710356 1971
- Pyle W. R. Smrcka N. R. “The Effect of Lubricating Oil Additives on Valve Recession in Stationary Gaseous-Fueled Four-Cycle Engine,” SAE Technical Paper Series 932780 1993
- Zhao R. Barber G. C. Wang Y. S. Larson J. E. “Wear Mechanism Analysis of Engine Exhaust Valve Seats with a Laboratory Simulator,” STLE 40 209 218 1997
- Malatesta M. J. Barber G. C. Larson J. M. Narasimhan S. L. “Development of a Laboratory Bench Test to Simulate Seat Wear of Engine Poppet Valves,” STLE 36 627 632 1993
- Lewis R. Dwyer-Joyce R.S. Josey G. “Design and Development of a Bench Test-Rig for Investigation Diesel Engine Inlet Valve and Seat Inset Wear” Proceedings of the 5th International Tribology Conference in Australia Institution of Engineers Australia 365 370
- Yang L.C. Hamada A. Ohtsubo K. “Engine Valve Temperature Simulation System,” SAE, 2000-01-0564