GSD-3 INVESTIGATION OF THE PITTING RESISTANCE OF WORM GEARS(GEAR STRENGTH AND DURABILITY)

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During the last decades synthetic oils have become more and more common for worm gear lubrication. Because of their lower wear rate in comparison to mineral oils the pitting resistance becomes increasingly important. During the last years a large number of worm gear tests were carried out at the FZG-worm gear test rigs to investigate the pitting phenomena of worm gears. These tests showed, that even with pitting areas up to 60 % the end of the life of a worm gear drive is not reached. Furtheron a continuous pitting growth during the total life time of a worm gear drive was not confirmed. The life time of a worm gear drive can be devided into three characteristic stages : 1. Stage of no pittings and low wear rates 2. Stage of pitting growth 3. Stage of decreasing pitting areas and comparably high wear The first stage is characterized by very low wear rates and no visible pittings. At the beginning of the second stage first pittings usually occur in the outlet area. Then the pitting area is steadily rising to a maximum. In the third stage the pitting area is decreasing because of increased wear rates. The third stage can last even multiple times of the first two stages. The end of the life time is reached, if consequential damages like transmission error because of wear or tooth breakage occur. Based on these tests a new calculation procedure was developed. In comparison to existing methods the new method allows the calculation of the pitting growth and the life time for all three stages along with the total life time of the gear drive.
一般社団法人日本機械学会の論文
2001-11-15

GSD-3 INVESTIGATION OF THE PITTING RESISTANCE OF WORM GEARS(GEAR STRENGTH AND DURABILITY)

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