Effects of Prestressing of the Ring Gear in Interference Fit on Flexural Fatigue Strength of Tooth Root

Yang, Shiping; Ji, Yixing; Xia, Tianyu

doi:10.1186/s10033-019-0381-3

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…They determined the friction coefficients of assembly for static and dynamic conditions. Yang et al 4 studied the effect of pre-stressing a tooth in a ring gear and the fatigue strength of the tooth root. They proposed a correction factor to determine the stress occurring on the tooth.…”

Section: Overviewmentioning

confidence: 99%

Effect of design parameters on stresses occurring at the tooth root in a spur gear pressed on a shaft

Güven

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Gears are commonly used in transmission systems to adjust velocity and torque. An integral gear or an interference fit could be used in a gearbox. Integral gears are mostly preferred as driving gear for a compact design to reduce the weight of the system. Interference fit makes the replacement of damaged gear possible and re-use of the shaft compared to the integral shaft. However, internal pressure occurs between mating surfaces of the components mated. This internal pressure affects the stress distribution at the root and bottom land of the gear. In this case, gear parameters should be re-considered to assure gear life while reducing the size of the gear. In this study, interference fitted gear-shaft assembly was examined numerically. The effects of rim thickness, profile shifting, module and fit tolerance on bending stress occurring at the root of the gear were investigated to optimize gear design parameters. Finite element models were in good agreement with analytical solutions. Results showed that the rim thickness of the gear is the main parameter in terms of tangential stress occurring at the bottom land of the gear. Positive profile shifting reduces the tangential stress while the pitch diameter of the gear remains constant. Also, lower tolerance class could be selected to moderate stress for small rim thickness.

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Section: Overviewmentioning

confidence: 99%

Effect of design parameters on stresses occurring at the tooth root in a spur gear pressed on a shaft

Güven

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…They determined the friction coefficients for the fit under static and dynamic conditions. Yang et al 21 investigated the effect of prestressing on the fatigue strength of tooth in a ring gear. They proposed a correction factor to determine the load on the tooth.…”

Section: Introductionmentioning

confidence: 99%

An XFEM-Based Approach to Fatigue Crack Growth in Press-Fit Spur Gears

Güven

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Gears mounted on a shaft via interference fit are the subject of an internal pressure which is essential for power transmission between gear and shaft. The pressure between shaft and gear is responsible for additional stresses occurring both in shaft and gear. This study examines the effect of stresses arising due to the interference on the crack growth that exists at the root of the gear tooth. The numerical analyses were conducted on models having different rim thicknesses by using the extended finite element method that allows mesh-independent crack modeling and does not need re-meshing. The results showed that internal pressure yields additional stresses in the tangential direction. The increment in tangential stress changed the location and intensity of the maximal 1st principal stress and accelerated crack growth. As the tightness of the fit increased, the crack turned towards the rim rather than towards the tooth. As the crack growth through the rim may cause a catastrophic failure of gear, the increment in tangential stress due to internal pressure is crucial for the fatigue life of the gear.

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“…Yang et al [2] combined theoretical analytical calculations and finite element analysis methods to study the law of stress distribution between interference fit surfaces. Frederic et al [3,4] used the contact finite element method to analyze the relationship between dimensions and end contact stress and proposed a verification method for interference fits.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of influencing factors on assembly accuracy of casings with interference fit rabbet

Guan

et al. 2022

International Symposium on Robotics, Artificial Intelligence, and Information Engineering (RAIIE 2022)

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At present, in the assembly of casings with interference fit rabbet, there is a common phenomenon that the design tolerance and machining accuracy of each group of casings are the same, but the actual assembly accuracy of the casings is different. This is due to the small differences in the geometrical error of the interference fit rabbet within the allowable tolerance range. The coupling effect of these errors directly affects the assembly accuracy of the casings and even affects the service life of the casings. In this paper, six influencing factors are selected to deal with this phenomenon. The degree of influence of each factor on the assembly accuracy is analyzed using the finite element analysis method based on the error model. The research objects are selected as a combustor casing and a compressor casing of a type of turbofan engine, and the two casings are connected by an interference fit rabbet. The evaluation index of assembly accuracy is selected as assembly coaxiality. These six influencing factors are selected as follows: rabbet coaxiality error, rabbet interference, rabbet fitting length error, flange surface perpendicularity error, flange surface flatness error and bolt pretightening force. Based on the orthogonal test method, the sensitivity values of each factor are calculated, and the degree of influence of each factor is ranked.

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Effects of Prestressing of the Ring Gear in Interference Fit on Flexural Fatigue Strength of Tooth Root

Cited by 7 publications

References 13 publications

Effect of design parameters on stresses occurring at the tooth root in a spur gear pressed on a shaft

Effect of design parameters on stresses occurring at the tooth root in a spur gear pressed on a shaft

An XFEM-Based Approach to Fatigue Crack Growth in Press-Fit Spur Gears

Sensitivity analysis of influencing factors on assembly accuracy of casings with interference fit rabbet

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