Study on Tooth Contact of Gear Couplings

Ohshima, Fumihiro; Hirata, Susumu; Yoshino, Hidehiro

doi:10.1299/kikaic.78.639

Cited by 11 publications

(7 citation statements)

References 5 publications

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“…The test results show that temperature rises, vibration and noise increase, and both tooth ends are seriously worn in a short time when misalignment angle reaches the maximum. Ohshima et al (2012) presented a new hub tooth surface interpolated from many section parabolic profiles to bring good tooth contact for gear couplings, and verified by the meshing test of the crown gear coupling. However, the test principle and device were not given.…”

Section: Introductionmentioning

confidence: 96%

An experimental investigation of contact characteristics of crown gear coupling with angular misalignment

Guan

Chen

et al. 2021

JAMDSM

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Crown gear couplings are commonly applied to transfer rotary motion and torsion from one rotating component to another under a certain misalignment angle. While computational models for contact analysis have recently been proposed, there is no validated contact analysis model of crown gear coupling with angular misalignment due to lack of experimental data. Accordingly, this study proposes to establish an extensive experimental database on contact characteristics of the conventional and novel crown gear couplings with different misalignment angles. A dedicated test rig, which can adjust misalignment angle, is designed and set up. A test matrix covering various misalignment angle conditions is executed in order to form a meshing contact database for crown gear coupling. The experimental data illustrates the variety of contact positions on the hub tooth surface caused by rotational position and misalignment angle. Simulation results obtained by loaded tooth contact analysis are compared to the experimental results for the conventional and novel crown gear couplings with different misalignment angles. The results show that the simulation model used to calculate contact analysis is effective, and the meshing performance of the innovative hub tooth profile is better than that of the conventional one.

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Section: Introductionmentioning

confidence: 96%

An experimental investigation of contact characteristics of crown gear coupling with angular misalignment

Guan

Chen

et al. 2021

JAMDSM

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“…Alfares et al, 16 Lei et al 17 optimized the design of key parameters such as the displacement circle radius, clearance and number of teeth of the gear couplings in order to improve the performance of the hub tooth. To meet the large misalignment design of the gear coupling, Ohshima 18 gave a new tooth profile with good contact and machined gear couplings capable of the meeting misalignment angle attention, 19 In˜urritegui et al 20,21 investigated spherical couplings capable of achieving isometric height misalignment angle (3°-10°) transmissions and gave design guidelines for the basic parameters of highly crowned spherical gear coupling. However, relatively little research has been done on how to effectively improve the load-carrying capacity and wear performance through the design of hub tooth.…”

Section: Introductionmentioning

confidence: 99%

Three-arc gear coupling design analysis for high load-carrying applications

Guan

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Three-arc gear couplings are machine elements which can meet the requirements of high load-carrying capacity. Effectively enhancing the load-carrying capacity of gear couplings has been an important research objective. Three-arc tooth design solution is proposed that effectively improves tooth performance, an analytical model of the three-arc tooth geometry parameters is given, and a functional relationship between key design parameters and load-carrying capacity and wear performance is established in this paper. The radius of the displacement circle and the radians of the three arc segments are used to design the three-arc tooth, the working domain coefficient and the radians of large arc are constructed and used as core variables. Through the Hertz theory and numerical simulation model, the contact theory of the hub tooth surface with modified drum coefficient is proposed, and the clearance, equivalent stress and surface contact stress of the tooth under the action of misalignment angle are studied, and then the evaluation model of the load-carrying capacity and wear performance of the three-arc hub tooth is established. Compared with the single-arc tooth, the three-arc tooth can improve the load-carrying capacity under the premise of ensuring the strength, misalignment angle and size, and at the same time, the reasonable design of the three-arc tooth can improve the wear performance.

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“…For this reason, an analytical generation model that takes into account the thread surface of the hob during generation has recently been developed [3] and experimentally validated [4]. This model has advantages over other published models [5,6], because it is able to generate tooth surfaces with a large amount of crowning and to produce undercut sections. Moreover, none of the models present in the literature were experimentally validated, as is the case of the proposed model [4].…”

Section: Introductionmentioning

confidence: 99%

“…The gear couplings must have a specific amount of backlash to avoid interference and, at the same time, enable the angular misalignment [6][7][8][9]. Angular clearance is the angle of rotation that exists when rotating the teeth on the hub while keeping the sleeve stationary, i.e.…”

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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Study on Tooth Contact of Gear Couplings

Cited by 11 publications

References 5 publications

An experimental investigation of contact characteristics of crown gear coupling with angular misalignment

An experimental investigation of contact characteristics of crown gear coupling with angular misalignment

Three-arc gear coupling design analysis for high load-carrying applications

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

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