Experimental Determination of the Roller Chain Load Distribution

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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“…H owever, it does not seem to be supported by experimental measurement of the chain link tension [3,10].…”

Section: Tension In a Chain Link On A Sprocketmentioning

confidence: 88%

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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“…Naji and Marshek [1] made an analysis to determine the load distribution of the elastic roller chain on an elastic sprocket. An experimental study was also conducted to determine the effect of elastic properties, geometric variations, and lubrication on roller chain load distributions [2]. Conwell and Johson [3] designed a unique machine capable of measuring the bearing force of a sprocket and the strain of the moving chain at the mid-point of a chain link.…”

Section: Introductionmentioning

confidence: 99%

A Refined Numerical Simulation on Dynamic Behavior of Roller Chain Drives

Zheng

Wang

Quek

2004

Shock and Vibration

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A refined numerical analysis of the dynamic behavior of roller chain drives is performed considering the roller assembly as a three-layer structure with mechanical clearance between each two of the mechanical components. Instead of using analytical method, explicit finite element technique is utilized for modeling and simulating the dynamic behavior of chain drives. The complete standard geometry of sprockets and all components of chain links are used in the developed model with minor geometry simplification. A primary goal is to achieve a more complete understanding of the dynamic behavior of chain drives especially in the transient vibration response of the engaging rollers, which is crucial for noise emission calculation. The simulated velocity response of the engaging rollers and roller-sprocket contact forces achieved using the full model are compared with what found by the simple model which has been adopted in analytical study of chain roller dynamics.

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“…In the 1950s and 1960s, Binder [1] and Rachner [2] presented the ® rst step to an analysis of forces and stresses in a chain drive, by assuming that the contact angle relative to the symmetry line of each tooth was constant. In the early 1980s, Naji [3] and Naji and Marshek [4,5] complemented Binder' s and Rachner' s research by theoretical and experimental investigations studying contact phenomena under quasi-static conditions due to non-trivial geometry of the sprocket tooth. In the 1990s, Kim and Johnson [6,7] improved the model employed by Naji [3] and Naji and Marshek' s [4,5] model using the full ANSI standard geometry.…”

Section: Introductionmentioning

confidence: 99%

A method to determine the dynamic load distribution in a chain drive

Troedsson¹,

Vedmar²

2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents a method to calculate the forces in a chain and, thus, the resulting load distribution along the sprockets in a chain transmission working at a moderate or high speed. When the chain drive is loaded, the rollers that contact the sprockets will move along the flanks to different height positions. There are mainly two different ways to determine the actual positions: to assume the positions or to use force equilibrium and to calculate the positions. To find the correct solution the geometry and the force equilibrium are used which will give each roller's position, along the flank. This method demands knowledge of all parts of the chain, even the slack part. Therefore it has been necessary to model both the connecting tight and the slack spans in which power between the two sprockets is transmitted. The gravitational force acting at the chain has been included in the complete model so that the position of the rollers and the forces in the links at the slack span can be calculated. The elastic deformation in the chain has also been included. The moment of inertia in the two sprockets and in the outer geometry has been taken into account, but not the inertia forces in the chain.

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Experimental Determination of the Roller Chain Load Distribution

Cited by 23 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

A Refined Numerical Simulation on Dynamic Behavior of Roller Chain Drives

A method to determine the dynamic load distribution in a chain drive

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