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Research Papers: Power Transmissions and Gearing

MG-IVT: An Infinitely Variable Transmission With Optimal Power Flows

[+] Author and Article Information
Francesco Bottiglione

Dipartimento di Ingegneria, dell’Ambiente e per lo Sviluppo Sostenibile, Politecnico di Bari, Viale del Turismo 8, 74100 Taranto, Italyf.bottiglione@poliba.it

Giacomo Mantriota

Dipartimento di Ingegneria, dell’Ambiente e per lo Sviluppo Sostenibile, Politecnico di Bari, Viale del Turismo 8, 74100 Taranto, Italymantriota@poliba.it

J. Mech. Des 130(11), 112603 (Sep 30, 2008) (10 pages) doi:10.1115/1.2976802 History: Received October 11, 2007; Revised June 09, 2008; Published September 30, 2008

The infinitely variable transmissions (IVTs) allow the transmission ratio to vary with continuity, offering the possibility of also reaching zero values for the transmission ratio and the motion inversion. In this paper an original infinitely variable transmission system is described (MG-IVT). MG-IVT is made up of the coupling of a continuously variable transmission, a planetary gear train, and two ordinary transmissions with a constant transmission ratio. By means of two frontal clutches, the MG-IVT is allowed to get two different configurations. The main purpose is to get the configurations that make the optimal efficiency of the transmission at different transmission ratios. Kinetic characteristics of single component devices are obtained, and the MG-IVT system’s performance is determined by considering how the efficiency of the component devices change as a function of operating conditions. The advantages of the MG-IVT are therefore shown in terms of power and efficiency in comparison to the traditional IVT.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of a parallel-IVT

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Figure 2

Schematic of a series-IVT

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Figure 3

Power flows in IVT

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Figure 4

Normalized power as a function of τIVT with no losses

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Figure 5

Schematic of the MG-IVT

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Figure 6

L phase of the MG-IVT

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Figure 7

Power flow in the L phase

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Figure 8

H phase of the MG-IVT

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Figure 9

Power flow in the H phase

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Figure 10

MG-IVT transmission ratio as a function of τCVT

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Figure 11

IVT and CVT power ratios as a function of τIVT (no losses)

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Figure 12

Nondimensional angular velocities of the planetary gears (a and d, shown in Fig. 5)

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Figure 13

IVT and CVT output torque ratios as a function of τIVT

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Figure 14

Efficiency of the MG-IVT as a function of τIVT(TCVT=1)

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Figure 15

Efficiency of the MG-IVT as a function of τIVT(TCVT=0.7)

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Figure 16

Efficiency of the MG-IVT as a function of τIVT(TCVT=0.4)

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Figure 17

MG-IVT output and input torque ratios as a function of τIVT

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