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1997
Conference Paper
Title
Bemessung von Keramikventilen für eine Serienfertigung
Other Title
Assessment of ceramic valves for mass quantity production
Abstract
The substitution of metal valves by ceramic valves in automobiles promises: I. Reduction of valve weight by about 60 per cent. II. Improvement of driving efficiency of the valve. III. Reduction in fuel consumption and C02 emissions. Ceramic valves have been already used in racing cars. However, the production costs especially the costs for the surface treatment are very high, therefore a mass production of ceramic valves is uneconomical. If a greater tolerance of material defects is permitted and the surface treatments are optimized, economic fabrication is obtainable. In this context, the following informations are required: I.Loading conditions of the valve. II. Endurable fatigue strength (dependent on geometry, loading mode and surface state). III. Models for the determination of loads and fatigue life assessment. IV. Scatter of endurable fatigue strength in mass production. V. Behaviour of valves under service conditions. Based on this background theoretical and experimental invest igations for assessment and series production of ceramics valves are carried out on car engines of Adam Opel AG and Daimler Benz AG.
Author(s)
Language
German
Keyword(s)
Bemessung
Betriebsbeanspruchung
ceramics
design
driving test
Fahrversuch
Fahrzeugbau
fatigue loading
fatigue strength test
Fertigung
Gewichtsreduzierung
keramischer Werkstoff
Lastfall
load case
manufacturing process
Motor
Oberflächenbehandlung
Oberflächenbeschaffenheit
operational loading
passenger car
Personenkraftwagen
Schwingbeanspruchung
Schwingfestigkeitsversuch
surface finish
surface treatment
Temperatur
temperature
valve
vehicle construction
Ventil
weight reduction