Load Carrying Capacity of Spur Gears : A New Gear-Load Testing Machine and Running-in and Failure of Gears Having a Lengthwise Tooth Error

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A new type of power-circulating, four square gear-load-testing machine in which the test gears can be loaded while they are rotating is introduced. This machine, having a capacity of 200 horse power at 1800 rpm, was designed by the authors and made in their laboratory. The results obtained were as follows : (1) The testing machine was simple in mechanism and gave no trouble during lengthy running tests of over 2×10^7 rotations because it was designed such that the gear load could be applied mechanically using a pair of circular-arc-tooth-trace cylindrical gears (having advantageous properties such as self-centering action, due to which the load applying mechanism became very simple), oil lubricated helical and spur splines, etc.(2) Test gears could be operated beyond 5×10^6 rotations producing only a very small number of pits (pitting area ratio less than 0.1%) at a Hertzian stress of 0.42 H_B which was greater than the Hertzian stress 0.4 H_B corresponding to the tangential load which produced the maximum reversed shear stress at the subsurface nearly equal to the endurance limit in reversed twisting (where, H_B is Brinell hardness before running).(3) It seems that past discussions made on the mechanism of pitting occurring on gear tooth surfaces must be re-examined fully using the data obtained by the authors.(4) It was clarified that the equations given by D.W. Dudley for calculating the allowable tangential load on spur gears with tooth-end contact were very insufficient in practice and that new equations based on the authors' experiments gave good results because the effects of running-in were taken into account.
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Load Carrying Capacity of Spur Gears : A New Gear-Load Testing Machine and Running-in and Failure of Gears Having a Lengthwise Tooth Error

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