Abstract
Transmission efficiency and refinement of planetary wheel hub gearing system are key design attributes for heavy and off-highway vehicles. Reduction of power loss, directly leading to the development of new generation ECO-axles requires analysis of gear contacting conditions for lubricated conjunctions to determine frictional performance. This is also affected by gear dynamics, which is a prerequisite for assessment of noise, vibration and harshness performance. Therefore, a combined tribo-dynamic analysis is essential. There is a dearth of such holistic analysis, particularly for the case of wheel hub planetary systems. The paper presents such an analysis, which has not hitherto been reported in literature. The inexorable interplay of transmission efficiency and noise, vibration and harshness refinement is demonstrated. The key attributes of noise, vibration and harshness refinement and transmission efficiency can pose contrary requirements and near-optimal conditions can be highlighted by mesh phasing of gearing contacts, thus alleviating the need for more complex gear teeth modifications entailing prohibitive manufacturing costs.
Highlights
Planetary gears have a wide range of application, including in vehicular drive trains
Mesh phasing of gear pairs is investigated to ascertain its effect upon both NVH refinement as well as transmission efficiency under representative in-field operating conditions
The wheel hub planetary gear set of the JCB MaxTrac rear differential is studied here
Summary
Planetary gears have a wide range of application, including in vehicular drive trains. Keywords Wheel hub, planetary gear set, transmission efficiency, gear dynamics, mesh phasing The study validated the effectiveness of lumped parameter modelling for the analysis of planetary gear dynamics.
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Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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