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A Geared, Continuously Variable Speed Transmission
Category(s):
For Information, Contact:
Jay Bjerke
Commercialization Manager, Engineering
515-294-4740
licensing@iastate.edu
Web Published:
5/8/2015
ISURF #
3131
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:

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:
*To see the full version of the patent(s), follow the link below, then click on "Images" button.
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


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