A Review of Dynamic CVT-IVT Transmissions

Morales, Francisco J.; Benítez, Francisco G.

doi:10.4271/2014-01-1734

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The main characteristics that determine the performance of the pulsed variable-speed drive aregear ratio, efficiency, reliability of the free-wheel mechanisms [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Research of working capacity of pulsed variable-speed drives

2019

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The paper presents the results of experimental researches of the basic working capacity characteristics of pulsed variable-speed drivesgear ratio, efficiency factor, and reliability of the eccentric free-wheel mechanisms When conducting research, the main working capacity parameters of the pulsed variable-speed drive (independent factors) changed according to the design of experiment in the range: the load applied to the output shaft was from 250 to 2.750 N·m; adjustable gear ratiofrom 20 to 180. It was established that the reliability of the eccentric free-wheel mechanisms is guaranteed when making mechanisms of 100Cr6 steel with hardness not lower than HRC Э 58…62 with a module of at least 0.75 mm. It was shown that the yield surface, which characterizes the change in the gear ratio of the pulsed variablespeed drive, can be described by a model using first-order polynomials. It was established that with increasing load, a slight increase (at 1.0...9.9%) occurs in the adjusted gear ratio, which has a character close to linear. It was concluded that with an increase in load, the increase in efficiency factor is non-linear and equals 1.8...2.6 times, an increase in the gear ratio causes its linear decrease by 1.13...1.64 times in the dependence close to a linear one. Empirical dependences are obtained to determine the magnitude of the gear ratio and efficiency factor.

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Section: Introductionmentioning

confidence: 99%

Research of working capacity of pulsed variable-speed drives

2019

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“…Despite the inherent benefits of CVTs, step-gear transmissions are traditionally used more widely in most of the industries. Besides, in applications where the power source is flexible enough to provide a wide variation of operational torque and rotational speed, a CVT would not provide a significant benefit (Morales and Benitez, 2014). The CVT system enhances the fuel economy and acceleration performance of a vehicle by better matching the engine operating conditions to the variable driving scenarios (Sun and Hebbale, 2005).…”

Section: Introductionmentioning

confidence: 99%

Modelling and validation of a novel continuously variable transmission system using slider crank mechanism

Rahman

Hudha

Kadir

et al. 2018

IJESMS

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Vehicle transmission system transfers torque and speed from the power source to drive wheels. Continuously variable transmission (CVT) system offers smooth ratio transition where it improves acceleration performance and reduces fuel consumption. Currently, most of the CVT system is actuated by the internal hydraulic circuit where compressibility of oil introduces non-linearity to the system causing difficulty in controlling CVT response. Therefore, a new free-hydraulic CVT system is developed to overcome the shortcomings in existing CVT. The proposed CVT system is designed based on belt-driven type which consists of two sets of variable pulley. Each set of variable pulleys is actuated by an electric motor using slider crank mechanism. The mathematical modelling of CVT mechanism is developed by using Lagrange formulation. The results from this study show that the simulation model of CVT mechanism can produce good performance behaviour in following desired radius position of the real CVT mechanism.

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Considerations on the operation of inertial continuous variable transmissions

Morales

Benítez

2020

Mechanism and Machine Theory

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A Review of Dynamic CVT-IVT Transmissions

Cited by 4 publications

References 2 publications

Research of working capacity of pulsed variable-speed drives

Research of working capacity of pulsed variable-speed drives

Modelling and validation of a novel continuously variable transmission system using slider crank mechanism

Considerations on the operation of inertial continuous variable transmissions

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