抄録
Tapered roller bearings on running provide heat. As a result, bearing, shaft and housing perform thermal expansion, and the axial load is different from the first preload. I have made researches experimentally how the axial load is changed by a difference of the housing material in the tapered roller bearing. And the purpose of this research is to clear up the relationship between the linear expansion coefficient of the housing material and axial load. I prepared several kinds of materials for the housing of the experimental device and measured a change of the axial load due to the difference of linear expansion coefficient. I used tapered roller bearings of the 30306 series for an experiment. In addition, I calculated life of bearing from average axial load. From those things, Research revealed that bearings are over preload when the housing linear expansion coefficient is smaller than the linear expansion coefficient of the bearing material, or much bigger than it, bearings lose preload.
