Half toroidal continuously variable transmission: Trade-off between dynamics of ratio variation and efficiency

Verbelen, Florian; Derammelaere, Stijn; Sergeant, Peter; Stockman, Kurt

doi:10.1016/j.mechmachtheory.2016.09.013

Cited by 15 publications

(8 citation statements)

References 31 publications

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“…Besides, there is a significant difference between the two loading methods. A sharp drop occurs in the overall efficiency during the constant loading that also appears in (Verbelen et al, 2017). Moreover, the smaller the loading force is, the earlier the efficiency will drop.…”

Section: Solving the Equilibrium Equationsmentioning

confidence: 85%

Adaptive loading ball traction drive reducer: modeling and efficiency performance

Luo

Wang

Jiang

et al. 2021

JAMDSM

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In this paper, a novel type of adaptive loading ball traction drive reducer (AL-BTDR) is proposed and investigated in modeling and efficiency performance. A combination of power flow and equal linear velocity method is developed to evaluate the speed ratio for the first time. Meanwhile, the spin loss at contact areas is also analyzed based on the Hertz contact theory, and a new approach depended on power flow is introduced to establish the efficiency model. By applying the efficiency model, the performance of efficiency with different output torque is calculated, and the distinctions under adaptive loading and constant loading are investigated. The results show that AL-BTDR has an excellent efficiency performance under adaptive loading with a maximum of 91%. Additionally, efficiency is higher under adaptive loading and will not sharply drop when compared with constant loading.

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Section: Solving the Equilibrium Equationsmentioning

confidence: 85%

Adaptive loading ball traction drive reducer: modeling and efficiency performance

Luo

Wang

Jiang

et al. 2021

JAMDSM

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“…The power split in (5) and (6) shows that only a fraction of the mechanical power is converted in an electrical way.…”

Section: Stator Outer Rotormentioning

confidence: 99%

“…The other way around, the EVT can also produce an overload torque which is thermally limited in time, as can also be seen in Table I. This feature, which can be used for short (but hard) accelerations, is an advantage compared to mechanical transmissions for which the rated torque is equal to the maximum torque and is limited by the maximum allowable clamping force [6].…”

Section: Overload Protection and Overload Capabilitymentioning

confidence: 99%

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Efficiency of a CVT-Operated EVT Experimentally Evaluated Against Half-Toroidal and Push-Belt CVTs

Druant

Vansompel

Belie

et al. 2018

IEEE Trans. Ind. Electron.

Self Cite

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This article describes how an electrical variable transmission (EVT) can be used as alternative for mechanical continuously variable transmission (CVT) systems. An EVT is an electromagnetic power split device having two mechanical and two electrical ports. The speed ratio between both mechanical ports (rotors) can be varied in a continuously variable way, so that this machine can be used as electromagnetic alternative for the mechanical pushbelt and half-toroidal CVT. Its operating principle is based on splitting the power into an electromagnetic direct path and an electrical path involving two inverters connected back-to-back. Its potential use as CVT is investigated by comparing experimental data against toroidal and belt CVT data from literature having comparable power ratings. To this end measurements are performed on a prototype 120 kW permanent magnet EVT.

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“…Tomaselle et al [21] analyzed the Nu Vinci drive and concluded that slight adjustments in geometry can improve the efficiency. Verbelen et al [22] analyzed half-toroidal CVT and concluded that an increase in clamping force improves the dynamics of CVT but degrades its efficiency. Toroidal CVT is an important type of CVT, which can be classified into full-toroidal and half-toroidal CVT.…”

Section: Introductionmentioning

confidence: 99%

A Novel Continuously Variable Transmission with Circumferentially Arranged Disks (CAD CVT)

Bilal,

Zhu,

Qureshi

et al. 2024

Actuators

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This paper presents a novel Continuous Variable Transmission (CVT) design. CVT is highly beneficial for actuators with rotary output as it can improve the energy efficiency of the actuators by providing an optimum transmission ratio. This property of CVT is highly beneficial for fossil-fuel-based vehicles, electric vehicles, wind turbines, industrial robots, etc. With the exception of Spherical CVT and DH CVT, all known CVTs like push belt CVTs, toroidal CVTs, Milner CVTs, etc., require additional gear sets and clutches for direction reversal and neutral gear ratio. However, Spherical CVT and DH CVT have low torque capacity due to a single traction point constraint. Foregoing in view, a new CVT named CAD CVT has been developed. The paper presents the design conception, the operating principle, the transmission ratio, the torque capacity, frictional losses, and experimental verification of the basic functionality by manufacturing a Proof of Concept (PoC). The proposed CVT is the only CVT capable of independent direction reversal and high torque capacity as it can transmit torque through multiple traction points. The new CVT will significantly impact high-torque applications in different engineering applications, especially land transport consisting of heavy vehicles like trucks, buses, and trailers.

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Half toroidal continuously variable transmission: Trade-off between dynamics of ratio variation and efficiency

Cited by 15 publications

References 31 publications

Adaptive loading ball traction drive reducer: modeling and efficiency performance

Adaptive loading ball traction drive reducer: modeling and efficiency performance

Efficiency of a CVT-Operated EVT Experimentally Evaluated Against Half-Toroidal and Push-Belt CVTs

A Novel Continuously Variable Transmission with Circumferentially Arranged Disks (CAD CVT)

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