A novel infinitely variable transmission (IVT) based on scotch yoke systems is designed to provide a continuously varied output-to-input speed ratio from zero to a specified value. By changing the crank length of scotch yoke systems, the speed ratio of the IVT can be continuously adjusted. The IVT consists of a pair of noncircular gears and two modules: an input-control module and a motion conversion module. The input-control module employs two planetary gear sets to combine the input speed of the IVT with the control speed from the stepper motor that changes the crank length of scotch yoke systems. The motion conversion module employs two scotch yoke systems to convert the combined speeds from the input-control module to translational speeds of yokes, and the translational speeds are converted to output speeds through rack–pinions. The speed ratio between the output of the motion conversion module and the input of the input-control module has a shape of a sinusoidal-like wave, which generates instantaneous variations. Use of scotch yoke systems provides a benefit to isolate the interaction between the crank length and the shape of the speed ratio, and a pair of noncircular gears can be used to eliminate the instantaneous variations of the speed ratio for all crank lengths. A prototype of the IVT was built and instrumented, and its kinematic behavior was experimentally validated. A driving test was conducted to examine the performance of the IVT.
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January 2016
Design Innovation Paper
Design, Modeling, and Experimental Validation of a Novel Infinitely Variable Transmission Based on Scotch Yoke Systems
X. F. Wang,
X. F. Wang
Department of Mechanical Engineering,
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
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W. D. Zhu
W. D. Zhu
Professor
Fellow ASME
Division of Dynamics and Control,
School of Astronautics,
Harbin Institute of Technology,
Harbin 150001, China;
Fellow ASME
Division of Dynamics and Control,
School of Astronautics,
Harbin Institute of Technology,
Harbin 150001, China;
Department of Mechanical Engineering,
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
Search for other works by this author on:
X. F. Wang
Department of Mechanical Engineering,
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
W. D. Zhu
Professor
Fellow ASME
Division of Dynamics and Control,
School of Astronautics,
Harbin Institute of Technology,
Harbin 150001, China;
Fellow ASME
Division of Dynamics and Control,
School of Astronautics,
Harbin Institute of Technology,
Harbin 150001, China;
Department of Mechanical Engineering,
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250
1Corresponding author.
Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received July 25, 2014; final manuscript received August 21, 2015; published online November 16, 2015. Assoc. Editor: Shapour Azarm.
J. Mech. Des. Jan 2016, 138(1): 015001 (8 pages)
Published Online: November 16, 2015
Article history
Received:
July 25, 2014
Revised:
August 21, 2015
Citation
Wang, X. F., and Zhu, W. D. (November 16, 2015). "Design, Modeling, and Experimental Validation of a Novel Infinitely Variable Transmission Based on Scotch Yoke Systems." ASME. J. Mech. Des. January 2016; 138(1): 015001. https://doi.org/10.1115/1.4031499
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