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Research Papers

Continuous Variable Transmission With an Inertia-Regulating System

[+] Author and Article Information
G. Centeno, F. Morales, F. B. Perez

Transportation Engineering, Faculty of Engineering, University of Sevilla, Camino de los Descubrimientos, Sevilla 41092, Spain

F. G. Benitez1

Transportation Engineering, Faculty of Engineering, University of Sevilla, Camino de los Descubrimientos, Sevilla 41092, Spainbenitez@esi.us.es

1

Corresponding author.

J. Mech. Des 132(5), 051004 (Apr 30, 2010) (13 pages) doi:10.1115/1.4001378 History: Received July 14, 2009; Revised March 02, 2010; Published April 30, 2010; Online April 30, 2010

This article describes a power transmission system applicable to vehicles. It consists of an oscillating, ratcheting-type, continuously variable transmission (CVT) system governed by an inertia mechanism. The inertia-regulating mechanism adds an additional degree of freedom and gives the system a dynamic character. The transmission consists of three different subsystems. The first of these converts the rotation of the engine or motor into an oscillating angular velocity movement and regulates the amplitude of this movement. The oscillating rotation from the first subsystem is used to drive a second subsystem, which acts as a regulating device by means of an inertial mechanism. The oscillating movement at the output of the second subsystem is rectified in the third, resulting in a unidirectional angular velocity. As a result, a unidirectional torque is generated at the output of the CVT, commensurate with the operating condition of the transmission, and this is capable of overcoming a torque resistance. A prototype of this transmission was built and tested to check the experimental results against those predicted by a series of computational simulations. As a result, the experimental graphs that characterize the operation of this type of transmission system were obtained, demonstrating its ability to function in an efficient manner.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Reverse epicyclic gear train

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Figure 2

(a) Reaction of the ring gear when planet carrier accelerates and sun gear is immobilized. (b) Torque transmitted to the sun gear.

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Figure 3

Variations in angular velocity of elements in the epicyclic gear train

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Figure 4

Variations in power in elements of the epicyclic gear train

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Figure 5

Rectifying mechanism

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Figure 6

Angular velocity of the output shaft

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Figure 7

Power flow with sun gear turning in (a) positive sense and (b) negative sense

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Figure 8

Variation of amplitude of angular velocity as a function of crank radius

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Figure 10

Scheme of the transmission system

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Figure 11

Mathematical model of the transmission system

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Figure 12

Maximum velocities for different levels of motor throttle

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Figure 13

Output velocity for different road gradients at full throttle

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Figure 14

Input angular velocity with and without flywheels

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Figure 15

Arrangement of prototype

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Figure 16

Prototype of dynamic CVT

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Figure 17

Test bench setup for dynamic CVT

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Figure 18

Torque recorded by an output torque-meter

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Figure 19

Angular velocity of the output shaft

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Figure 20

Input and output powers

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Figure 22

Transmission ratio

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Figure 23

Transmission ratio in the presence of increasing output torque at different input angular velocities

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Figure 24

Efficiency against transmission ratio at different input angular velocities

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Figure 25

Efficiency as a function of transmission ratio and output torque

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