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Abstract: Gear and transmission efficiency is one of the major issues in the automotive and aerospace industries. Both fuel economy and emission characteristics of vehicles are influenced by the efficiency of the drive trains and transmissions. The literature on gear efficiency is limited to few models. Accuracy of these models was not demonstrated, mainly due to the lack of experimental data, especially under high-speed conditions. Recent experiments by Chase [1] and Petry-Johnson [2] provided an extensive set of experimental data on efficiency for unity-ratio, precision spur gears operating at high- power conditions, representing racing applications. This experimental database was instrumental in validating the efficiency model of Xu, et al [3] for spur gears. This study presents experiments with the aim of extending this jet-lubricated spur gear efficiency database to non-unity ratio, production quality gear pairs having various surface treatments and operating with different lubricants under typical passenger vehicle conditions. As a separate study, it also provides a complete spin loss database for unity-ratio gears operating under dip-lubricated conditions. Direct comparisons between the two lubrication methods are also presented. Lastly, details of a design study for development of a test machine for efficiency measurements for helical gears is presented.
This book comprises the selected contributions from the 2nd World Congress on Condition Monitoring (WCCM 2019), held in Singapore in December 2019. The contents focus on digitalisation for condition monitoring with the emergence of the fourth industrial revolution (Industry 4.0) and the Industrial Internet-of-Things (IIoT). The book covers latest research findings in the areas of condition monitoring, structural health monitoring, and non-destructive testing which are relevant for many sectors including aerospace, automotive, civil, oil and gas, marine, and manufacturing industries. Different monitoring systems and non-destructive testing methods are discussed to avoid failures, increase lifespans, and reduce maintenance costs of equipment and machinery. The broad scope of the contents will make this book interesting for academics and professionals working in the areas of non-destructive evaluation and condition monitoring.
Includes the institute's Proceedings.
Abstract: An experimental investigation of high-speed spur gear efficiency was conducted for both jet-lubricated, dry sump conditions and dip-lubricated conditions. Inspection methodologies were developed for the documentation of gear surface roughness and wear after each test. An experimental test matrix including gears of two different modules and surface roughness levels operating under jet-lubrication conditions with four different gear lubricants was developed to quantify the influence of these parameters on load- dependent (mechanical) and load-independent (spin) power losses. The spur gear efficiency test machine was modified for dip-lubricated load independent power loss measurements, allowing direct comparison to jet-lubricated conditions using the same test fixtures. An experimental test matrix including unity ratio gears of different module and face width operating in an oil bath of four different levels for a range of rotational speed and oil viscosity was developed. The influence of rotational speed, oil viscosity, oil bath level, and rotational direction on load independent power loss was quantified.