Performance Evaluation of Ball CVT and Comparison with Half Toroidal CVT

Afrabandpey, Arian; Ghariblu, H.

doi:10.1007/s12239-018-0052-x

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…The power and motion in traction drives are transmitted by the film in the gap of the rolling element and disks, and recent developments have heightened the need for increasing the transmission performance, especially in terms of the transmission efficiency. [6][7][8][9] Florian et al 10 studied the trade-off behavior of half-toroidal CVT between the dynamics of ratio variation and efficiency performance. In a later study, the trade-off behaviors of the full-toroidal and half-toroidal CVT were compared, and the results showed that the half-toroidal configuration outperforms the full-toroidal one over the entire operating range.…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation robot joint performance evaluation of a zero-spin traction drive with non-Newtonian fluid considered

Shuaidong,

Guanghui,

Renqiang

et al. 2024

Advances in Mechanical Engineering

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In this study, a zero-spin cone-roller traction drive (CRTD) is presented for the joints transmission system in rehabilitation robots due to its high transmission performance and characteristics of overload protection. It can achieve safe interactions among humans, rehabilitation robots, and the environment, making it a potential substitute for traditional gear-based transmission systems. The performance of CRTD, especially efficiency, is studied in this paper based on an elastohydrodynamic lubrication (EHL) model with the considerations of the non-Newtonian effect. The results demonstrate that the overall efficiency differs in different stages, reaching a maximum value of 95%. The overload protection activates when there is a sharp drop in efficiency, and the overload threshold can be identified by the efficiency, which may provide guidance for operation and optimization.

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Section: Introductionmentioning

confidence: 99%

Rehabilitation robot joint performance evaluation of a zero-spin traction drive with non-Newtonian fluid considered

Shuaidong,

Guanghui,

Renqiang

et al. 2024

Advances in Mechanical Engineering

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show abstract

“…The result of their work showed that half toroidal CVT was more superior to the full one. Afrabandpey (Afrabandpey and Ghariblu, 2018) studied the contact performance between traction parts to evaluate the efficiency of ball CVT and half toroidal CVT. Tomaselli (Tomaselli et al, 2019;Tomaselli et al, 2020) established the efficiency model of NuVinci with slip and spin considered to evaluate the performance of single-idler and double-idler geometries.…”

Section: Introductionmentioning

confidence: 99%

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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Multi-Speed Transmission Mechanism Using a Compound Planetary Gear Set and Brakes

Bang

2019

Int.J Automot. Technol.

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Performance Evaluation of Ball CVT and Comparison with Half Toroidal CVT

Cited by 8 publications

References 23 publications

Rehabilitation robot joint performance evaluation of a zero-spin traction drive with non-Newtonian fluid considered

Rehabilitation robot joint performance evaluation of a zero-spin traction drive with non-Newtonian fluid considered

Adaptive loading ball traction drive reducer: modeling and efficiency performance

Multi-Speed Transmission Mechanism Using a Compound Planetary Gear Set and Brakes

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