Study on Load Bearing Capacity of Gears with Smaller Number of Teeth : 1st Report, Surface Durability of Normalized Steel Spur Gears

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This paper presents a study on the surface durability and pitting failure of normalized steel spur gears with a smaller number teeth (z=13) from the viewpoints of the Hertz stress, specific sliding and position of pitch point in the range of engagement. The contact fatigue life of a normalized steel spur gear pair is governed by the pitting of a driver when the pitch point lies in the range of single tooth pair contact, which is common in practice. But when the pitch point lies in the range of double tooth pairs contact, the life is governed by the pitting of a driver or follower depending on the Hertz stress and specific sliding. The contact fatigue limit load of a pinion (driver) can be raised considerably by locating a pitch point in the range of double tooth pairs contact in the dedendum region of the driver.
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