Effective production techniques designed to improve the contact fatigue strength of automatic transmission gear teeth

Watanabe, Youichi

doi:10.1016/s0389-4304(03)00010-9

Cited by 3 publications

(7 citation statements)

References 1 publication

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“…Gears are among the most important components of mechanical systems for power transmission. The main design trend of gear transmission systems is to maintain a highload and high-speed operation capacity to ensure a light weight [1][2][3][4][5]. The failure of key components, such as gears, in the transmission chain, results in the breakdown of the entire system.…”

Section: Introductionmentioning

confidence: 99%

“…There are two methods to extend the service life of gears. One is to enhance the strength of the material used for gear manufacturing, and the other is to reduce the stress that it endures [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Many factors, including material properties, working conditions, and stress state, can influence the occurrence of different gear-failure modes [3,4]. Despite many techniques such as case hardening (including carburization and nitridation, surface finishing, and profile modification), the most frequent failures, especially pitting, micropitting, and flank fracture, cannot be avoided.…”

Section: Introductionmentioning

confidence: 99%

“…Despite many techniques such as case hardening (including carburization and nitridation, surface finishing, and profile modification), the most frequent failures, especially pitting, micropitting, and flank fracture, cannot be avoided. High-performance alloy steel with a surface case-hardening process is the basic requirement for gears in transmission systems such as those for wind turbines, ships, automobiles, and helicopters [3,6]. Moreover, different terminal processes are adopted according to the design requirements and process conditions to improve the service properties by prolonging the fatigue life of gears [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces

Huang

Gao³

et al. 2022

Metals

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Pitting, which results from contact fatigue, is a common failure mode in gear transmission systems and is influenced by the material strength and stress state of the contact area, which is further influenced by lubrication and roughness because of stress fluctuations. In this study, a comparative contact-fatigue test was conducted on two types of gears with different terminal machining processes. The contact stress of the tooth surface considering the microtopography was analyzed using the fractal method based on surface microtopography data measured from the surface formed by the two processes. Test results show that the average service life of gears machined using the barrel-finishing process was approximately 5–7 times that of gears machined using grinding. The pitting morphologies of gears fabricated using different processes exhibited evident differences. The maximum stress level of the gears machined with barrel finishing was approximately twice that of the gears machined through grinding. Different stress levels resulted in different micropitting load-bearing capacities, which could be attributed to the different service lives of gears manufactured through different machining processes. The different presence features of the pitting morphology were due to the different micromorphologies of the surface formed by the different finishing processes. In particular, the randomly distributed pitting morphology of the gear surface machined using the barrel-finishing process was due to its flattening and polishing effect. Optimization of the surface-microgeometry distribution via the finishing process is an effective method for prolonging the service life of gears.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces

Huang

Gao³

et al. 2022

Metals

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“…Its use has been reported after machining processes or after heat treatments in order to reduce the possibility of the cracks resulting from these processes advancing, leading the material to fracture failure 17 . At the industrial level, SP has been used to increase fatigue resistance in the aerospace industry 18 , as well as in engine components like connecting rods and crankshafts 19 , 20 ; at the medical and dental level, it has been used to increase fatigue fracture resistance in titanium implants 21 and in dental prosthesis cast clasps 22 .…”

Section: Introductionmentioning

confidence: 99%

Shot peening increases resistance to cyclic fatigue fracture of endodontic files

Nino-Barrera

Sanchez-Aleman

Acosta-Humánez

et al. 2021

Sci Rep

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The objective of this study was to assess the resistance to fatigue fracture of conventional nickel–titanium files after undergoing shot peening. Forty NITIFLEX endodontic files, number 30, were divided into two groups; one was submitted to shot peening treatment and the other was not. All instruments were tested for fatigue fracture in simulated canals with a TRI-AUTO ZX endodontic motor. One file of each group was subjected to a residual stress analysis by XRD. Finally, the fractured surface was observed and elemental analysis performed by means of SEM and EDX. Roughness analysis was made by focal variation microscope. The shot peening group showed greater resistance to fatigue fracture; there was no difference in the length of the fractured fragments. XRD results showed the presence of residual compression stresses in the file submitted to shot peening, a decrease in the interplanar spacing, and an increase in the full-width-at-half-maximum and the microstrains. SEM and EDX showed a ductile fracture with zones of fatigue and an equiatomic ratio between the nickel and titanium. Surface roughness increased after the file was subjected to the shot peening procedure. In conclusion, shot peening increases the resistance to fatigue fracture due to the presence of residual compression stresses in files manufactured from a conventional nickel–titanium alloy.

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Twin disc micropitting tests

Ahlroos¹,

Ronkainen²,

Helle³

et al. 2009

Tribology International

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Effective production techniques designed to improve the contact fatigue strength of automatic transmission gear teeth

Cited by 3 publications

References 1 publication

Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces

Influence of the Machining Process on the Service Life and Pitting Morphology of Gear-Tooth Surfaces

Shot peening increases resistance to cyclic fatigue fracture of endodontic files

Twin disc micropitting tests

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