Theoretical Efficiency of a Cranked Link Chain Drive

Hollingworth, N E; Hills, D.A.

doi:10.1243/pime_proc_1986_200_141_02

Cited by 19 publications

(15 citation statements)

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“…M easurement of the tension in a chain link on a quasi-static sprocket [3] showed this model to be reasonably accurate for slow drives with a signi cant slack span or back tension. At approximately the same time, H ollingworth and H ills used a similar force model [4] to formulate equations for the ef ciency of a chain drive by calculating the losses due to sliding friction between the pin, bush and roller during articulation [5]. H owever, the origin of these equations is unclear.…”

Section: Introductionmentioning

confidence: 99%

A model of the tension and transmission efficiency of a bush roller chain

Lodge

Burgess

2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper describes an improved chain link tension model for a simple two-sprocket roller chain drive. The model includes modi ed versions of previous models of the tension in the chain links, together with a new model for low-slack span tensions. The model allows the tension of a link to be calculated at any point in the chain drive more quickly and for a wider range of tight and slack span tensions than before. A new chain ef ciency model is formulated, based on the losses due to sliding friction. Coupled with the chain link tension model, this can be used to predict the transmission ef ciency of a chain. Experimental work undertaken on 0.5 in pitch industrial roller chains and bicycle chains has demonstrated that the chain ef ciency model is accurate for moderate and high torque transmissions. At low torque, losses due to impact, adhesion and/or vibration become more signi cant and impair the accuracy of the model, particularly for heavier, industrial roller chains. The chain ef ciency model enables certain design trade-offs to be carried out, such as the selection of the size of the overall system to achieve the right balance of transmission ef ciency and weight.

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Section: Introductionmentioning

confidence: 99%

A model of the tension and transmission efficiency of a bush roller chain

Lodge

Burgess

2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Most publications indicate that the relative motion in the chain joint (articulation) is too complex to be simulated by pin-on-disc or other similar standard wear models and characterization methods [9][10][11][12]. Experiments performed in [9] indicate that wear was observed on most of the pin circumference and that the wear pattern was more equiaxial pitting indicating that the surface has experienced mild fretting in addition to abrasive wear.…”

Section: Wear and Efficiency Modelingmentioning

confidence: 99%

Novel Low Cost, High Reliability Wind Turbine Drivetrain

Chobot¹,

Das²,

Mayer³

et al. 2012

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EXECUTIVE SUMMARYClipper Windpower, in collaboration with United Technologies Research Center, the National Renewable Energy Laboratory, and Hamilton Sundstrand Corporation, developed a low-cost, deflection-compliant, reliable, and serviceable chain drive speed increaser.This chain and sprocket drivetrain design offers significant breakthroughs in the areas of cost and serviceability and addresses the key challenges of current geared and direct-drive systems. The use of gearboxes has proven to be challenging; the large torques and bending loads associated with use in large multi-MW wind applications have generally limited demonstrated lifetime to 8-10 years [1]. The large cost of gearbox replacement and the required use of large, expensive cranes can result in gearbox replacement costs on the order of $1M, representing a significant impact to overall cost of energy (COE). Direct-drive machines eliminate the gearbox, thereby targeting increased reliability and reduced life-cycle cost. However, the slow rotational speeds require very large and costly generators, which also typically have an undesirable dependence on expensive rare-earth magnet materials and large structural penalties for precise air gap control. The cost of rare-earth materials has increased 20X in the last 8 years representing a key risk to ever realizing the promised cost of energy reductions from direct-drive generators. A common challenge to both geared and direct drive architectures is a limited ability to manage input shaft deflections.The proposed Clipper drivetrain is deflection-compliant, insulating later drivetrain stages and generators from off-axis loads. The system is modular, allowing for all key parts to be removed and replaced without the use of a high capacity crane. Finally, the technology modularity allows for scalability and many possible drivetrain topologies. These benefits enable reductions in drivetrain capital cost by 10.0%, levelized replacement and O&M costs by 26.7%, and overall cost of energy by 10.2%.This design was achieved by: (1) performing an extensive optimization study that determined the preliminary cost for all practical chain drive topologies to ensure the most competitive configuration; (2) conducting detailed analysis of chain dynamics, contact stresses, and wear and efficiency characteristics over the chain's life to ensure accurate physics-based predictions of chain performance; and (3) developing a final product design, including reliability analysis, chain replacement procedures, and bearing and sprocket analysis. Definition of this final product configuration was used to develop refined cost of energy estimates. Finally, key system risks for the chain drive were defined and a comprehensive risk reduction plan was created for execution in Phase 2.

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“…If the lubrication, rotational speed, and torque of the transmission are measured to be fixed characteristics of the transmission, and not design parameters, then the transmission efficiency of the transmission is decided principally by selection of the chain and sprocket size. It has been revealed that larger sprockets can increase the transmission efficiency 3–6.…”

Section: Introductionmentioning

confidence: 99%

Chain gear design using artificial neural networks

Toktaş

Başak

2012

Comp Applic In Engineering

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In this study, the analytical calculation and analysis for the data corresponding to these gears have been made to obtain alternative test and training data sets to be used at the artificial neural networks (ANNs) with the constraints and requirements for the design of chain gears of power and motion transmission mechanisms are determined. In the input layer, the constraints and requirement values (input power, number of revolution of the pinion, number of revolution of the gear and center distance) of chain gears are used while at the output layer chain code (i.e., the chain gear type and chain sequence number), specifying the functional and physical properties, is used. Then the network is tested with the test data. The analytical calculation results and ANN predictions are compared by using statistical error analyzing methods such as absolute fraction of variance (R 2 ), root mean square error (RMSE), and mean error percentage (MEP) for the training and test data. The chain code has been determined by the ANN with an acceptable accuracy. It is concluded that ANNs can be used as an alternative method in chain gear design. ß

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Theoretical Efficiency of a Cranked Link Chain Drive

Cited by 19 publications

References 0 publications

A model of the tension and transmission efficiency of a bush roller chain

A model of the tension and transmission efficiency of a bush roller chain

Novel Low Cost, High Reliability Wind Turbine Drivetrain

Chain gear design using artificial neural networks

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