Measurement of Helical Gear Transmission Error and Improvement of Analytical Method.

Yoshikawa, Kunihiko; Tani, Hirofumi; Tarutani, Ichiro; Suzuki, Akira; Maki, Hiroki; Ueda, Yoshihisa

doi:10.1299/kikaic.63.1775

Cited by 9 publications

(3 citation statements)

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“…For k ci , the Hertzian contact theory of cylindrical contact (Fig. 5) was used (Yoshikawa et al, 1997), and for the rolling radii used in the theoretical formula (R i in Fig. 5), the rolling radii of both gears at each Gaussian quadrature node were applied.…”

Section: Meshing Analysis Theory For Laminated Gearmentioning

confidence: 99%

Basic study on transmission error for gear made from different metals laminated in width direction to provide rigidity distribution

YOSHIZUMI,

AOYAMA,

SHIBATA

2023

Mechanical Engineering Journal

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To improve the load characteristics of the transmission error for helical gears, a gear made of laminated materials is proposed. The gear has three layers in which metals with different rigidities are laminated in the tooth width direction. The layers on both sides are made from the same metal, and a different metal is used for the central layer. A theoretical analysis was performed to investigate the effects of arranging high-and low-rigidity layers and changing the width of the central layer. The laminated gear has load characteristics different from the transmission error for a conventional homogeneous material gear. The transmission error can be reduced with the combination of a high-rigidity central layer and a low-rigidity side layers, and a low transmission error can be maintained over a wide load range by adjusting the central layer width appropriately. The principle of the reduction in the transmission error is that, by changing the rigidity along one-pitch meshing progress with laminated materials, the elastic deformation of the teeth can largely cancel out the rotational fluctuations caused by the tooth flank shape over the wide load range. A pair of laminated gears was manufactured, and testing confirmed that the laminated gear has a transmission error lower than that for a gear made from a homogeneous material. The laminated gear has the potential to achieve the lower vibration/noise generation for the wider load range than the homogeneous gear.

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Section: Meshing Analysis Theory For Laminated Gearmentioning

confidence: 99%

Basic study on transmission error for gear made from different metals laminated in width direction to provide rigidity distribution

YOSHIZUMI,

AOYAMA,

SHIBATA

2023

Mechanical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…Recently, to meet user needs, making the vehicle room quieter has become a big challenge [1].The gear noise is especially problematic. The tooth surface accuracy greatly affects vibration of the gears [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

Contact Analysis of Tooth Surface in Gear Meshing Based on Infrared Ray Imagery

Nakajima

Hirogaki

Aoyama

et al. 2013

MSF

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Improving accuracy ofthe gear tooth surface has become an important challenge, because the toothsurface accuracy greatly influences vibration of gears. However, for the spiralbevel gear, the tooth surface accuracy is considered to be very difficult toevaluate because the geometrical theory is difficult. Generally, the managementof tooth surface accuracy has conventionally been substituted by the toothsurface contact evaluation with red lead, which is a kind of paint. However,the results of visual examinations are too subjective. We therefore focused onthe infrared ray imagery to investigate the gear tooth meshing. In this research,a high response infrared thermography was used to estimate the tooth contact ofa hypoid gear under running conditions. Specifically, we looked at the increasein temperature on the tooth surface caused by gear meshing. The results clearlyshowed that the temperature was affected by load, sliding speed between toothsurfaces, and the average peripheral speed of tooth surface. We also proposedan equation that predicts tooth surface temperature rise and showed its utility.Thus, the proposed method effectively evaluates the tooth surface accuracy ofhypoid gear.

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“…Demand is also increasing for less gear noise, which is almost a pure tone, that is severely offensive to the human aural. The frequency of gear noise equals the reciprocal frequencies of the teeth during the meshing cycle, and meshing transmission error becomes a factor in generating noise (1)～ (3) . A previous method for improving the contact ratio was devised by increasing the number of teeth to decrease the meshing transmission error, which also decreased the gear noise (4) (5) .…”

Section: Introductionmentioning

confidence: 99%

Design Method of Number of Teeth for Low Noise Gears Considering Human Aural Characteristics

Araragi

Uenishi²,

Hirogaki

et al. 2008

JAMDSM

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Recently, increased user demand for quiet vehicle environments has resulted in the need to develop low-noise gears that do not generate noises that are harsh on to the human aural. The principal method for reducing meshing transmission error has been to gear design with as many teeth as possible. However, while these design methods have focused on decreasing gear noise, they have not considered the relationship between gear noise and the background noise of vehicle interiors. In fact, it would appear that no research considering the human aural characteristics associated with gear noise under these conditions has been conducted to date. Furthermore, the problem of gear noise on background noise in vehicle has increased as the use of hybrid engine technology in vehicle has become more pervasive in recent years. The proposed technique for reducing gear noise involves gear design that frequency control of gear noise by changing the number of teeth. The technique described here considers human aural limit and the influence of masking, and how these are affected by the tooth settings of low noise gear. This was achieved by assessing human aural characteristics in the unique acoustic environment of the vehicle interior. Then, the relationship between the number of teeth and the sound pressure level of gear noises was investigated. It was found that the proposed method of varying the number of teeth was effective for designing gears with optimal human aural characteristics.

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Measurement of Helical Gear Transmission Error and Improvement of Analytical Method.

Cited by 9 publications

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Basic study on transmission error for gear made from different metals laminated in width direction to provide rigidity distribution

Basic study on transmission error for gear made from different metals laminated in width direction to provide rigidity distribution

Contact Analysis of Tooth Surface in Gear Meshing Based on Infrared Ray Imagery

Design Method of Number of Teeth for Low Noise Gears Considering Human Aural Characteristics

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