Variable Speed Transmission

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Summary Most vehicles today use transmissions that provide three or four specific speed ratios, but do not necessarily allow the car engine to operate at optimum speed. To increase the efficiency of vehicle operation, ISU researchers have developed a continuously variable speed transmission that can improve performance. Development Stage Pilot/Pre-Commercial Description Most cars on the road today use transmissions that supply three or four specific speed ratios, but do not automatically optimize vehicle operation. Some vehicles today use variable speed belt drives or toroidal, continuously variable speed transmissions. However, these transmissions typically use traction drive elements that transmit forces and motion through friction, and larger loads require larger drive packages. To overcome these limitations, ISU researchers have developed a geared continuously variable speed transmission that produces continuously variable speeds by using gears instead of friction elements. As a result, higher loads can be managed than with traction drives of the same size. In addition, this continuously variable speed transmission can help vehicles run more efficiently and save fuel costs. Advantage Enables smooth vehicle operation (eliminates shift shock) Permits operation at optimum throttle position (or optimum engine speed) which allows for peak torque and improved acceleration Improves automobile efficiency, resulting in fuel savings Application Automotive transmissions, bicycle transmissions, machine tool transmissions Patent Information Country           Serial No.        Patent No.       Issued Date United States  11/828,621      7,938,033*       5/10/2011 United States  12/851,670      8,534,146*       9/17/2013 Direct Link http://isurftech.technologypublisher.com/technology/19302 Category(s) Engineering & Physical Sciences ISURF #3131