Research Papers

Design, Modeling, and Simulation of a Geared Infinitely Variable Transmission

[+] Author and Article Information
X. F. Wang

Department of Mechanical Engineering,
University of Maryland,
Baltimore County,
1000 Hilltop Circle,
Baltimore, MD 21250

W. D. Zhu

Fellow ASME
Department of Mechanical Engineering,
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 August 19, 2013; final manuscript received February 20, 2014; published online May 8, 2014. Assoc. Editor: Qi Fan.

J. Mech. Des 136(7), 071011 (May 08, 2014) (9 pages) Paper No: MD-13-1366; doi: 10.1115/1.4026950 History: Received August 19, 2013; Revised February 20, 2014

An infinitely variable transmission (IVT) to provide a continuous output-to-input speed ratio from zero to a certain value is designed, and its working principle is illustrated. It is a geared IVT (GIVT), since its function to achieve the continuously varied speed ratio is implemented by gears. Crank-slider systems are used in the GIVT; the output-to-input speed ratio is changed with the crank length. Racks and pinions, whose motion is controlled by planetary gear sets, are used to change the crank length when the cranks rotate. One-way bearings are used to rectify output speeds from different crank-slider systems to obtain the output speed of the GIVT. Since the crank-slider systems can introduce variations of the instantaneous speed ratio, a pair of noncircular gears is designed to minimize the variations. A direction control system is also designed for the GIVT using planetary gear sets. Finally, a vehicle start-up simulation and a wind turbine simulation to maintain a constant generator speed are developed based on a GIVT module in the Matlab Simulink environment.

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Fig. 1

Schematic for the basic principle of the GIVT and the process to change the output-to-input speed ratio

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Fig. 2

Layout of the GIVT

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Fig. 3

Motion flow of the GIVT; connecting gears 1 through 5 are numbered in the figure

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Fig. 4

(a) Three-dimensional (3D) model of the input-control module and (b) the schematic of the input-control module

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Fig. 5

(a) Schematic of the motion conversion module and (b) the 3D model of the motion conversion module

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Fig. 6

Schematic of the crank motion when (a) the control speed is zero or (b) the input speed is zero; and (c) the 3D model of the crank and crank gears

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Fig. 7

3D model of the driver part and output part

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Fig. 8

Schematic of the crank-slider motion

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Fig. 9

(a) Speed ratios of a crank-slider system and the motion conversion module and (b) the average speed ratio of the GIVT

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Fig. 10

Reduced speed ratios with and without noncircular gears when r = 10 mm and r = 5 mm

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Fig. 11

Pitch profiles of NG1 and NG2 with D = 10 mm

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Fig. 12

(a) Schematic of the direction control and (b) the 3D model of the direction control

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Fig. 13

Block diagram of a vehicle model in the Matlab Simulink environment

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Fig. 14

Desired speed ratios for the vehicle start-up simulation

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Fig. 15

(a) Engine speed and (b) the vehicle velocity in the vehicle start-up simulation

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Fig. 16

Block diagram of the control system of the GIVT

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Fig. 17

Block diagram of the wind turbine simulation in the Matlab Simulink environment

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Fig. 18

(a) Turbine speed as the input speed of the GIVT module and (b) the generator speed as the output speed of the GIVT module, whose desired value is 1200 rpm




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