SUPPORT STRUCTURE OF ROLLING BEARING, AND ACTUATOR OF VARIABLE COMPRESSION RATIO MECHANISM OF INTERNAL COMBUSTION ENGINE

To provide a support structure of a rolling bearing capable of suppressing increase of friction even at low temperature.SOLUTION: A support structure of a rolling bearing has an outer ring made of a material with a coefficient of linear expansion different from that of a fixing member and arranged in a recess part provided in the fixing member, an inner ring supporting a rotational shaft, and a rolling body arranged between the inner ring and the outer ring, where an annular portion forming an inner peripheral surface of the recess part of the fixing member supporting a rolling bearing arranged so that a radial preload can be generated by temperature change between the outer ring, the inner ring and the rolling element, has a thick part with a long radial distance from the inner peripheral surface, and a thin part with a short radial distance from the inner peripheral surface.SELECTED DRAWING: Figure 7 【課題】 低温時であってもフリクションの増加を抑制可能な転がり軸受の支持構造を提供する。【解決手段】 固定部材と異なる線膨張係数の材料からなり、固定部材に設けられた凹部に配置された外輪と、回転軸を軸支する内輪と、内輪と外輪の間に配置された転動体と、を有し、外輪と内輪と転動体との間に温度変化によって径方向の予圧が発生し得るように配置された転がり軸受を支持する固定部材の凹部の内周面を形成する環状部分は、内周面からの径方向距離が長い厚肉部と、内周面からの径方向距離が短い薄肉部と、を有する転がり軸受の支持構造とした。【選択図】 図７