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After a period of operation high speed turbo gears may exhibit a change in the longitudinal tooth contact pattern reducing full face width contact and thereby increasing the risk of tooth distress due to the decreased loaded...

Micropitting occurs in gears and rolling-element bearings that operate in the mixed or micro EHL lubrication regime. It manifests in many different ways depending on the loads, speeds, rolling and sliding velocities, macrogeometry, surface topography, edge effects,...

Different high-performance gear oils were examined on an FZG back-to-back gear test rig to determine if changeover to these high-performance gear oils could stop micropitting formation which occurred with other industrial gear oils. The test results showed...

This paper presents the AGMA925-A03 scuffing risk predictions for a series of spur and helical gear sets of transmissions that are used in commercial vehicles ranging from SAE class 3 through class 8. Contact temperature was calculated...

Micropitting, pitting and wear are typical gear failure modes, which can occur on the flanks of slowly operated and highly stressed internal gears. However the calculation methods for the flank load carrying capacity have mainly been established...

The first edition of the international calculation method for micropitting, ISO TR 15144-1:2010, was just published last December. It is the first official international calculation method to check for the risk of micropitting ever published. Years ago,...

The number of repetitions of these three different loading cycles varies with the vessel duty cycle and life. The published values of allowable design stress for teeth are based on pulsing loads, which must be modified for...

Hypoid gears are bevel gears with non-intersecting axes where the hypoid ofset is defined as the shortest distance between these two axes. Hypoid gears are preferred over bevel gears without offset if aspects of gear noise or...

The load distribution measurement of gear teeth and the determination of the face load factor for contact stress KHβ are of fundamental importance for the gear manufacturing industry. The factor KHβ is a measure for the uniformity...

Once the assembly has been described, an algebraic model is created, in which each dimension is represented by a vector, with a nominal length +/- a tolerance. The vectors are linked into chains or loops, describing each...