Untersuchung Des Festigkeits- Und Verschleißverhaltens Von Polyamidzabnrädern Zur Schaffung Von Berechnungs- Und Konstruktionsunterlagen
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Polyamide eignen sich auf Grund ihrer günstigen mechanischen Eigenschaften, ihrer guten Gleiteigenschaften, ihres geringen Verschlei es, ihrer hohen Dämp- fungsfähigkeit und ihrer Korrosionsbeständigkeit sehr gut als Zahnradwerk- stoffe und haben als solche auch schon in zahlreichen Fällen Anwendung in Leistungsgetrieben gefunden. Sie unterscheiden sich jedoch in ihrer Zusammensetzung und ihrem molekularen Aufbau weitgehend von den Metallen. Dadurch ist auch ihr andersartiges Ver- halten bei mechanischer Beanspruchung und gegenüber Temperatur und Feuch- tigkeitseinflüssen bedingt. Ihre Wärmeleitfähigkeit ist geringer, und sie neigen bei statischer Belastung bereits bei Raumtemperatur zum Flie en, was bei Metallen erst bei weit höheren Temperaturen beobachtet wird. Alle diese Erscheinungen führen dazu, da man bei Polyamidzahnrädern nicht einfach die für Stahlzahnräder aufgestellten Berechnungsverfahren - natürlich mit weit geringeren zulässigen Festigkeitswerten - anwenden kann. Für die Berechnung können Einzelnachweise über Zahnfu festigkeit und Flanken- beanspruchung bisher noch nicht voneinander getrennt geführt werden, weil die Firmenangaben bezüglich der Festigkeitswerte weit streuen. Hingegen werden von vielen Firmen Berechnungsmethoden angegeben, die zum Teil auf Versuchen basieren, und bei denen die oben erwähnten Einzel- beanspruchungen zusammengefa t berücksichtigt werden. Die wichtigsten dieser Berechnungsverfahren sind in dieser Arbeit aufgeführt, und es ist mit allen das gleiche Beispiel durchgerechnet worden. Die übertragbaren Leistungen, die sich dabei ergaben, schwanken zwischen 1,26 und 2,9 PS.
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