Efficiency Estimation of Roller Chain Power Transmission System

Zhang, Sheng-Peng; Tak, Tae-Oh

doi:10.3390/app10217729

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…The sprocket system is an essential part of the rotary transmission in cycling. It has high reliability, flexibility, cost efficiency, and slip elimination (Ji et al, 2021;Lee et al, 2020;Zhai et al, 2019;Zhang and Tak, 2020). Several studies have sought to improve the sprocket system's mechanical efficiency, such as developing a new pedal-crank system (Hyeong et al, 2017;Ismail et al, 2020;Zamparo et al, 2002), investigating sprocket tooth profile to reduce chain friction and energy impact (Seller and Mezeix, 2019;Wang et al, 2013), investigating an optimized tooth model for chain shifting (Kim, 2013;Lai et al, 1998;Lin and Tseng, 1998;Ma and Chiou, 2017).…”

Section: Introductionmentioning

confidence: 99%

Computer-aided design of bi-ellipse bicycle sprocket

Lesmawanto

Hsu

Chang

2022

JAMDSM

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In cycling, pedaling is a combination of two pedal strokes by the left and right legs with different power. The pedaling power is transmitted from the human leg to the bike through the sprocket mechanism. However, research on sprocket design that considers the combination of two pedal strokes is limited. This paper proposes a CAD method to design a bi-ellipse sprocket that combines half different ellipses. The ellipses combination is used to accommodate the different torque between two pedals. Here, we built a sprocket prototype by adjusting the two vertical axes ratio on the bi-ellipse sprocket to be equal to the maximum torque ratio on the left and right crank. Then, we performed a pedaling comparison test between the circular sprocket and bi-ellipse sprocket prototype at the same rear-wheel rotational speed using a mountain bicycle mounted on an indoor bike trainer. In the test, the bi-ellipse prototype was also set up in eight different positions to the crank. Crank meter systems were installed on the bike to obtain the pedaling torque data and the pedaling power data on the left and right crank every 0.005 seconds. The result showed that the comparison parameter related to crank torque and power had smaller values on the bi-ellipse prototype than pedaling on the circular sprocket. Moreover, the asymmetry index of maximum torque in a specific position on the crank was lower than the circular sprocket. It can be concluded that using the bi-ellipse sprocket prototype makes pedaling more efficient, lighter, and safer to use. The proposed method can also be used as a guidance procedure to make countless bi-ellipse sprocket models.

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Section: Introductionmentioning

confidence: 99%

Computer-aided design of bi-ellipse bicycle sprocket

Lesmawanto

Hsu

Chang

2022

JAMDSM

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“…In [5], non-linear stiffness properties are exploited to dampen cable vibrations. Finally, in [8], non-linear effects are estimated to find chain transmission efficiency.…”

Section: Non-linear Analysismentioning

confidence: 99%

“…A novel approach for estimating the efficiency of roller chain power transmission systems is proposed in [8]. It is based on sliding friction losses and damping force.…”

Section: Machine Elementsmentioning

confidence: 99%

Advances in Mechanical Systems Dynamics 2020

2021

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“…Although the method [6] using hardware-in-the-loop simulation for the electric bicycle driven on a motor dynamometer shows an energy efficiency error rate of 0.06% between the simulation and field test, it does not take into consideration the transmission system of the electric bicycles. When only the chain drive system estimation is considered [11], it is reported that the transmission efficiency error rate of the chain drive system itself is 0.23-3.77%; thus, the error rate is expected to increase significantly when other transmission components are considered. It can be concluded that the estimated transmission efficiency in this study can evaluate the performance of electric bicycles with reasonable accuracy considering all the components of transmission systems.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…However, there was no experimental validation to support the results. In Zhang et al [11], the transmission efficiency of the chain drive system was calculated considering the sliding friction force of pin articulation and bush articulation, lateral offset due to the derailleur system, and damping force between two sprockets. The transmission efficiency was computed considering the rotational speed of the sprocket, lateral offset angle, and torque.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Evaluation of Electric Bicycle Power Transmission Systems

Zhang¹,

Tak²

2021

Sustainability

Self Cite

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In this study, a method for estimating the efficiency of electric bicycle power train systems consisting of typical components, such as an electric motor, gears, sprockets, and chains is presented. In order to calculate the efficiency of a power train system, the relationship between the drive motor torque and the road-load that is exerted on the rear wheel was derived, considering kinematic inertia effects and friction losses between power transmission elements. Among the factors that influence efficiency, it was found that friction losses play a dominant role, while the effects of inertia are insignificant. The factors that influence the efficiency of electric bicycles due to friction losses, such as the transmission efficiency of the chain system and the bearing in the sprocket and wheel, were quantified. To validate the proposed efficiency calculation procedure, an experimental electric bicycle was used, in which the driving torque and road-load could be quantitatively assessed, and the actual efficiency was measured on a chassis dynamometer. It is shown that for a given motor torque, a measured and estimated dynamometer torque obtained by the proposed method exhibits a good correlation, and the transmission efficiency of each component was quantified. This method provides a practical and accurate means to calculate the drive train efficiency of electric bicycles at the design stage to improve the efficiency of electric bicycles.

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Efficiency Estimation of Roller Chain Power Transmission System

Cited by 9 publications

References 18 publications

Computer-aided design of bi-ellipse bicycle sprocket

Computer-aided design of bi-ellipse bicycle sprocket

Advances in Mechanical Systems Dynamics 2020

Efficiency Evaluation of Electric Bicycle Power Transmission Systems

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