Planetary gearboxes are becoming more popular due to their high-power density and potentially high efficiency. When the planet bearings are internally mounted, the body of the planet gear has to be hollow. The demand for large outer diameters due to high-load requirements might result in a small planet rim thickness. Depending on the rim thickness, its rigidity may become very low. Due to the low stiffness and the special load conditions caused by the double meshing, the deformation of the planet and its bearings are unique. In this paper, the influence of rim thickness on bearing load and lifetime is examined. The analysis is performed with a finite element method (FEM) model of a planet rim with a built-in cylindrical roller bearing. With the resulting planet deformation from the FEM calculation, the load distribution on the rolling elements in the bearing and the bearing lifetime according to ISO/TS 16281:2008 has been evaluated.
Planetary gearboxes are often used for their efficiency and high torque density. In large-scale wind turbine gearboxes with a rotating planet carrier, an effect called contact pattern movement was discovered where the contact pattern moves in the width direction of the mesh while the carrier rotates. A coefficient to evaluate this behavior was previously defined but its calculation requires a lot of computation time and accurate measurements can potentially be very expensive. Therefore in this publication an approach is developed to calculate an approximate contact pattern coefficient from a limited amount of data.
Planetary gearboxes are becoming more popular due to their high power density and potentially high efficiency. When the planet bearings are internally mounted, the body of the planet gear has to be hollow. The demand for large outer diameters due to high load requirements might result in a small planet rim thickness. Depending on the rim thickness, its rigidity may become very low. Due to the low stiffness and the special load conditions caused by the double meshing, the deformation of the planet and its bearings are unique. In this paper, the influence of rim thickness on bearing load and lifetime are examined. The analysis is performed with an FEM model of a planet rim with a built-in cylindrical roller bearing. With the resulting planet deformation from the FEM calculation, the load distribution on the rolling elements in the bearing and the bearing lifetime according to ISO/TS 16281:2008 have been evaluated.
Planetary gearboxes are often used for their high power density. Designs featuring a rotating carrier are popular because of their high gear ratio and potentially good efficiency. Especially in bigger constructions as in wind turbine gearboxes, it has been observed that the contact pattern moves in the width direction while the carrier rotates. This may lead to higher damage on the tooth flanks or reduced lifetime of the planet bearings underneath the mesh due to oscillating loads. The main influences on this phenomenon have yet to be investigated and no characteristic value has been defined to describe the moving contact pattern. It is only with this type of coefficient that the complex results of contact analysis can be evaluated clearly so that disadvantageous constructions can be distinguished from better ones. Therefore in this paper a coefficient to evaluate moving contact pattern is defined and used in a theoretical study about the influence of a radially displaced sun shaft on the contact pattern movement.
INHALT Die Notwendigkeit für Verzahnungskorrekturen im Hinblick auf die Flankentragfähigkeit ergibt sich in Leistungsgetrieben maßgeblich aus den lastbedingten Verformungen der umliegenden Bauteile sowie der Zahn- und Radkörperverformung selbst. Unter Lastkollektivbelastung sind auch diese Verformungen im Betrieb nicht konstant. In dieser Veröffentlichung wird ein Verfahren gezeigt, mit dem eine Flankenkorrektur ermittelt werden kann, die hinsichtlich der Flankentragfähigkeit unter Lastkollektivbelastung optimiert ist. Die gezeigte Methode wurde im Rahmen des FVA- Vorhabens 722/I entwickelt. Die Ergebnisse der Korrektur- bestimmung wurden anhand von Industriebeispielen validiert und weisen eine hohe Übereinstimmung mit den in der Praxis auf Basis von Erfahrungswissen ausgeführten Zahnflanken-korrekturen auf. A Method to Determine Toothing Corrections under Variable Load Conditions
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