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The manufacturer of an air-cooled four-stroke engine contracted with Southwest Research Institute (SwRI) to design an automatic compression release device. The purpose of the device was to reduce initial cranking torque and the tendency of the starter to stall. Requirements included:
The last requirement proved most difficult, because many similar devices have been patented. SwRI conceptualized a device actuated by the centrifugal force of the rotating camshaft. The device was modeled using Pro/ENGINEER™, and extensively simulated using ADAMS to prove its dynamic performance. The intricate, small parts involved dictated further analysis to validate the durability, including finite element analysis. Concerns about sticking friction and failure to actuate because of oil deposits were considered.
For more information about this engine design project, or how you can contract with SwRI, please contact Mark Tussing at mtussing@swri.org or (210) 522-2628.
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| Design and Development | Engine, Emissions & Vehicle Research Division | SwRI Home | |
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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions. |
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December 28, 2012 |
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