Bicycle chain efficiency

Kidd, M. D.

doi:10.1201/9781003078098-37

Cited by 6 publications

(7 citation statements)

References 17 publications

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“…These rigs [2] [3] set a mass swinging in a pendulum motion either from the end of a chain wrapped around a sprocket or, in a tensioned low-friction dual sprocket set-up, from the centre of the upper sprocket. A laser interferometer is used to measure the oscillatory decay of the pendulum, where the decay rate is a function of the friction within the chain / sprocket interfaces.…”

Section: Pendulum Rigsmentioning

confidence: 99%

Guidance document on physical testing of chain lubricants

Davidson¹,

Kamps²,

Knott³

et al. 2023

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Section: Pendulum Rigsmentioning

confidence: 99%

Guidance document on physical testing of chain lubricants

Davidson¹,

Kamps²,

Knott³

et al. 2023

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“…2). In this study, the differences between pin and bush articulations are neglected [5,6,15] and Coulomb's law of friction is assumed. Therefore, the losses associated with the meshing motion can be estimated with the following expression:…”

Section: Loss Calculation 431 Meshing Lossmentioning

confidence: 99%

“…Although chain drives are known for their high energetic efficiency (about 99% for single speed transmissions, [4,5]), several studies have been presented to explain the phenomena responsible for power losses [4][5][6][7][8][9]. Among these works, different potential sources of dissipation have been considered.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary modelling of power losses in roller chain drive: application to single speed cycling

Lanaspeze

Guilbert

Manin

et al. 2022

Mechanics & Industry

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A quasi-static chain drive model is proposed. This model, consistent with single speed cycling application, applies to simple two sprocket drives. The kinematics of the transmission is determined, including the capture and release positions of the rollers and the influence of the polygonal effect. The tensions into the links and the contact forces (between rollers and sprocket) are then calculated based on the results of the kinematic analysis. Both chain strands are assumed to be straight and their tension are considered as imposed. An estimate of the roller displacement is proposed using existing studies on the relationship between loading conditions and roller positions along the sprocket tooth profile. The presented model, is then used to assess the contribution of both meshing and roller motion on the global efficiency of the drive. Calculations show that the magnitude of both loss sources is similar for a wide range of gear ratios and loading conditions. According to the presented results, the relative motion between the rollers and the sprocket tooth profile should be considered in future studies dedicated to chain drive efficiency.

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“…This setup represents the maximum angle between smallest driving sprocket on the front and the largest driven sprocket on the back of the derailleur system. This offset results in a lateral force in axial direction of the component, 17 calculated as: Thereby, a combination of an axial load with the torsional load resulting from the application of force via a lever arm of r = 42.0 mm is indicated. The components are subsequently tested until dismantling of the steel ring, thus resulting in a prompt drop of the transmittable torque.…”

Section: Fundamental Analysis Of the Interdependencies Between Joint ...mentioning

confidence: 99%

Joining of hybrid semi-finished products from sheet metal by orbital forming

Hetzel

Lechner

Merklein

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Contrary demands like a reduction of carbon dioxide emissions and an increase in functionality are facing the manufacturing industry with growing challenges. When processing functional components, like synchronizer rings, conventional process chains, like shearing and subsequent joining, are reaching their limits due to an increased complexity of the components and a lack in efficiency, referring to the long process time. To meet these challenges, the strategy of lightweight construction combines the application of lightweight materials with efficient manufacturing processes and an innovative product design. One possibility within lightweight construction is the utilization of load-adapted hybrid components, featuring different material strength classes. In previous research, the process of orbital forming is used to manufacture semi-finished products with a varying thickness profile due to the specific radial material flow. This material flow should now be used to realize a permanent joint between materials of two different strength levels. Therefore, the process of orbital forming is modified to manufacture hybrid semi-finished products from a dual-phase steel DP600 and a naturally rigid aluminum alloy EN AW 5754, both with an initial thickness of 2.0 mm. Different joint geometries are cut by laser into a steel ring and the part is coaxially positioned around a basic aluminum disc inside a die and subsequently formed. The joint is investigated regarding the geometrical and mechanical properties, comparing a radial cross-section and the micro hardness distribution. In order to reveal the potential of orbital forming for a combined forming and joining operation, the axial as well as the peeling strength of the multi-material components are investigated and evaluated.

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Bicycle chain efficiency

Cited by 6 publications

References 17 publications

Guidance document on physical testing of chain lubricants

Guidance document on physical testing of chain lubricants

Preliminary modelling of power losses in roller chain drive: application to single speed cycling

Joining of hybrid semi-finished products from sheet metal by orbital forming

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