MT21-1 AUTOMOTIVE MANUAL TRANSMISSION EFFICIENCIES : AREAS FOR IMPROVEMENTS AND FUTURE CONFIGURATIONS(ASPECTS FOR MECHANICAL TRANSMISSIONS IN THE 21^<ST> CENTURY)
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概要
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In 1949, the first engine dynamometer was installed at Southwest Research Institute (SwRI), thereby initiating an automotive research program that today exceeds $100 million USD in annual revenues. This program has grown to include virtually all things automotive. One of the fastest growing areas of automotive research at SwRI is in transmission design. Great advances have been made in automotive transmission design, yet there is still much room for improvement. The current production, multi speed manual transmission, used in automotive applications represents a very mature technology. A typical transmission consists of a dual shaft configuration, containing five pairs of gears in rotating contact with each other through which various load paths are selected. Supporting this system is a multiplicity of bearing sizes, types and locations. The challenge to the transmission designer is to provide a system that can provide high efficiency across a wide range of operating speeds and torque, under continually changing conditions. Yet based upon dynamometer test results, efficiency values for transmissions used in similar sized vehicles, but produced by different manufacturers, have been found to vary greatly. This paper will provide efficiency trends and values associated with current production manual transmissions and how they are affected by mounting angle and operating temperatures. Areas in which improvements to efficiency can be realized will be discussed including lubrication, windage, bearings, supports, and gear tooth modifications.
- 一般社団法人日本機械学会の論文
- 2001-11-15
著者
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Downing Walter
Southwest Research Institute
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KLUGER Michael
Department of Vehicle Research Systems Southwest Research Institute