Development of Supercarburized Tappet Shim to Improve Fuel Economy 2000-01-0613
A newly developed surface hardening process, supercarburizing, has been developed for the application of tappet shim to improve fuel economy. Supercarburizing has been introduced to increase resistance of wear and pitting performance and was designed to have supersaturated carbon surface layer and further to have spheroidized carbide morphology. In this presentation, the process variables, such as surface microstructure, morphology and distribution of carbide precipitation, will be discussed via the results of friction loss tests. At an entire speed range investigated, the application of supercarburized tappet shim improved fuel economy with 25∼30% in terms of valve train itself and with 4∼5% concerning on the gross engine performance. The fuel economy analysis showed that the improved surface hardening process of tappet shim increased fuel economy of vehicle about 1.4∼3.6%.
Citation: Ahn, S., Ban, H., Jo, B., Kim, S. et al., "Development of Supercarburized Tappet Shim to Improve Fuel Economy," SAE Technical Paper 2000-01-0613, 2000, https://doi.org/10.4271/2000-01-0613. Download Citation
Author(s):
Seung Gyun Ahn, Hyung Oh Ban, Bong Lae Jo, Seung Cheal Kim, Seung Cheal Jung
Affiliated:
Hyundai Motor Co.
Pages: 13
Event:
SAE 2000 World Congress
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Sensors and Transducers-PT-68, SAE 2000 Transactions Journal of Materials & Manufacturing-V109-5
Related Topics:
Fuel economy
Valve trains
Hardening
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