Development of Supercarburized Tappet Shim to Improve Fuel Economy

2000-01-0613

03/06/2000

Event
SAE 2000 World Congress
Authors Abstract
Content
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%.
Meta TagsDetails
DOI
https://doi.org/10.4271/2000-01-0613
Pages
13
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.
Additional Details
Publisher
Published
Mar 6, 2000
Product Code
2000-01-0613
Content Type
Technical Paper
Language
English