To suppress a bearing internal gap or changes in preload to be caused by a temperature decrease in a use environment.
A bearing mounting structure includes: a rolling bearing 10 having an outer ring 11 which supports only an axial load; a shaft 20; a housing 30 having an inner radial surface 31 fitted to the outer ring 11; a spacer 40; and a second spacer 50. The housing 30 is formed of a material having a positive linear expansion coefficient greater than that of the bearing 10 and the shaft 20. The spacer 40 is made of a material having a negative linear expansion coefficient. The second spacer 50 is made of a material having a positive linear expansion coefficient. In the bearing mounting structure, the spacer 40 is disposed at the front side of the outer ring 11, the second spacer 50 is disposed at the back side of the outer ring 11, and the outer ring 11 accepts the spacer 40 or the second spacer 50 which is expanded thermally, thereby moving in a direction where a bearing internal gap (δr) is increased or reduced.
Takayoshi Tagawa
Higashio Masahiro
Tounaga Mitsuhiro