Fig. 23 Anti Polishing Ring
In princip the liner insert (antipolishing ring) limits the bult up of carbon on the top land to a specific diameter, which is always less than the bore diameter. There is then no possibilty of top land contact with the bore over the effective Stroke of the piston rings, so that the surface finish of the bore is not harmed. A different pressure regime above the top ring may also occur after the top land enters the restricted portion of bore, due to compression of the gas in the volume formed between the lower end of the liner insert and the top ring.
As also the honing structure of the cylinder is cutted by the ring no oil can flow through the honing channels into the combustion chamber.
Lubricating oil consumption has been significantly reduced, as already mentioned, by this means and kept stable over long running periods.
7. CONCLUSIONS
The centenary of the Diesel engine patent was commemorated in 1993 with genuine pride and expressions of confidence in the future prospects [7]. The growing number of new genera-tion engines launched in the last years and the high level of development activity, restructuring and investment being made by the major companies substantiate the view that the industry has a secure future.
The Federal-Mogul companies have a long tradition in this engine sector and have established a worldwide reputation for innovation, product development and high quality cylinder components. This record of achievement acts as a springboard giving advantage and elegance to satisfy market needs in the challenging years ahead.
REFERENCES
I. Mierbach, Dueck and Newman Heat flow through piston rings and ist influence on shape, SAE paper 831283
2. Dueck, G E and Newman, B A, 'Piston Ring Develop- ment - Trends in Europe for Off-Highway Applications'. SAE paper 810934 (SP-494)
4. Braendel, Modern Ring Design for High Output Engines 10 th Internatinai Congress on Combustion Engines Washington 1973
5. Avezou, Ongetta, Philby and Risch, Development of Light Vehicle Diesel Piston Systems T&N Symposium 1995 Paper 21
6. Mierbach, Hildyard, Parker and XU, Piston Ring Performance Modelling T&N Symposium 1995 Paper 15
7. 'Diesel Technology Today and Tomorrow'. Special Issue commemorating the 100th anniversary of the Diesel patent. Diesel and Gas Turbine Publications, May, 1993.
