GSD-15 PITTING AT CONTACT END CHANGING IN CONTACT AND LUBRICATING CONDITION DUE TO PLASTIC DEFORMATION(GEAR STRENGTH AND DURABILITY, INCLUDING GEAR MATERIALS AND HEAT TREATMENT TECHNIQUES)

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  • MATSUMOTO Susumu
    The Graduate School of Information, Production and Systems, Waseda University
  • YASUE Yuko
    The Graduate School of Information, Production and Systems, Waseda University
  • TSURUTA Yusuke
    The Graduate School of Information, Production and Systems, Waseda University
  • YAMAGUCHI Toshihiko
    The Graduate School of Information, Production and Systems, Waseda University
  • YOSHIMI Takeshi
    The Graduate School of Information, Production and Systems, Waseda University

抄録

To explain the causes of pitting at contact end of gear teeth and rolling bearing race, the changing in shape and lubricating condition at contact end of rolling contact surfaces due to plastic deformation by local high contact pressure are investigated. By the in-situ observation used the EHL optical interference tester, the move of position where contact pressure shows maximum value was observed from the contact end to inside. And new contact end is produced. In order to confirm the position that rolling fatigue pit (pitting) occurs, 4-discs rolling contact machine was used under the contact condition in presence of plastic deformation at initial contact end. As results of rolling fatigue tests, fatigue pits arise at inside of contact. The pitting position is influenced considerably by the contact pressure, oil film thickness and number of revolutions under shake-downed surface profile due to plastic deformation. So to make the prevention measure at rolling contact end, it is necessary to predict the relation profile change and the pitting position.

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