Teeth contact behavior and load distribution of gear couplings.

Nakashima, Katuhiro

doi:10.1299/kikaic.54.1302

Cited by 12 publications

(4 citation statements)

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“…Ma and Hou [10] derived the relative displacement and tooth load distribution of a crowned gear coupling at different misalignments. Alfares et al [11] developed a computational contact algorithm to calculate the clearance distribution of misaligned gear couplings, and results were correlated with those in Nakashima [12] and Heinz [13]. Tjernberg [14] found that tooth-spacing errors affected the number of teeth in contact during operation.…”

Section: Meaningmentioning

confidence: 99%

Theoretical and experimental study on gear-coupling contact and loads considering misalignment, torque, and friction influences

Guo

Lambert

Wallen

et al. 2016

Mechanism and Machine Theory

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A new analytic model addresses the tooth contact and induced loads of gear couplings that are affected by misalignment, torque, and friction. The contact model accounts for Hertzian, bending, and shear deformations of coupling teeth considering crown modifications. For a specified torque and shaft misalignment, the model calculates the number of teeth in contact, tooth load, stiffness, stress, deformation, and safety factors. The tooth load distribution around the circumference compares well with high fidelity finite-element/contact-mechanics analyses. Simulation time with the analytic model is orders of magnitude less. Using the local contact characteristics, the model computes coupling loads that are primarily caused by the disrupted tooth contact and sliding friction caused by axial motions. This analytic model was validated by experiments. The load amplitude depends on the misalignment, torque, and friction. At low torque, coupling motion was induced by the eccentricity between the hub and sleeve even with nearly perfect alignment. This eccentricity was caused by its self-weight. When torque was larger than a threshold, the motion amplitude was greatly reduced. This torque threshold was analytically derived and validated by experiments.

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Section: Meaningmentioning

confidence: 99%

Theoretical and experimental study on gear-coupling contact and loads considering misalignment, torque, and friction influences

Guo

Lambert

Wallen

et al. 2016

Mechanism and Machine Theory

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show abstract

“…In addition, the uneven clearance distribution will cause the number of teeth in contact to vary as a function of the applied torque and misalignment angle, resulting in a variation of the coupling stiffness [15]. To determine the number of teeth in contact, the scientific literature shows finite element models [16,17] and unloaded tooth contact analysis algorithms [3,18]. However, the standards [7,9,19,20] do not include the effect of geometry or loading conditions in their equations.…”

Section: Introductionmentioning

confidence: 99%

Geometry optimisation of highly crowned gear couplings working in high misalignment applications to reduce tooth root stresses

Iñurritegui,

Larrañaga,

Arana

et al. 2023

MATEC Web Conf.

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Crowned gear couplings are mechanical components used to transmit power between misaligned rotating shafts. Their geometry is characterised by a significant longitudinal crowning to accommodate angular misalignment. Recent studies reveal that high misalignments drastically reduce the number of teeth in contact and lead to an uneven load distribution among engaged teeth. Consequently, tooth root fracture becomes a common failure mode. Current standards only address misalignment angles below 1.5°, treating applications with greater misalignments as special cases without design guidelines or stress prediction methods. This study proposes a procedure to optimize the design of crowned gear couplings working in high misalignment applications by determining tooth root stress distribution. The geometry is analytically generated, while finite element models are used to calculate the stress distribution. Experimental validation is performed using a dedicated test rig. The obtained results are very close to the ones from the numerical model, demonstrating the suitability of the method for crowned gear couplings operating under significant angular misalignments. The optimized design reduces tooth root stress by 50%, which will increase the fatigue life of the component or enable the application of higher torque values.

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“…14 calculated load sharing between meshing teeth of crown gear coupling due to angular misalignment based on the clearance distribution and tooth stiffness. Nakashima 15 derived the amount of minimum clearance at any rotated angle and obtained a path of contact on a tooth surface, which was used to calculate the number of teeth in contact and the load distribution, assuming that the hub surface was formed by a positive continuous modification along the hub rotation axis. A disadvantage of these models is that they cannot capture complicating effects such as tooth surface modifications and assembly errors.…”

Section: Introductionmentioning

confidence: 99%

“…The shape of the surface is a vital factor in the accuracy of the loaded contact analysis of crown gear coupling. Using a similar geometric model of crown gear coupling to Nakashima’s, 15 Alfares 17 studied the influence of the gear modulus, pressure angle, crown amount, and profile geometry on the minimum clearance distribution along the circumferential direction of each gear tooth when misaligned by dividing the hub surface into several nodes. The result showed that misalignment was the main factor for determining the clearance distribution and that proper crowning could improve the clearance distribution.…”

Section: Introductionmentioning

confidence: 99%

Effects of misalignment and crowning on contact characteristics of crown gear coupling

Guan

Fang

Yang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Although crown gear couplings are widely used in rotating machinery, very little is known about their contact behavior and load distribution characteristics. In this study, the manufacturing methods are presented for crown gear coupling. Complete geometrical mathematical models from tools to crown gear coupling are proposed based on the theories of differential geometry and gear mesh. Then, a high-fidelity finite element model verified by tooth contact analysis under light load is employed to investigate load distribution along the crown gear coupling interfaces. The effects of meshing position, torque, and angular misalignment are investigated on load distributions along with crowning amount depending on the displacement circle radius. Finally, it is observed that when the contact position is 0.2 times the width of the tooth, the radius of the displacement circle is the optimal result for the performance of the crown gear coupling.

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Teeth contact behavior and load distribution of gear couplings.

Cited by 12 publications

References 0 publications

Theoretical and experimental study on gear-coupling contact and loads considering misalignment, torque, and friction influences

Theoretical and experimental study on gear-coupling contact and loads considering misalignment, torque, and friction influences

Geometry optimisation of highly crowned gear couplings working in high misalignment applications to reduce tooth root stresses

Effects of misalignment and crowning on contact characteristics of crown gear coupling

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