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Spiral groove thrust bearings are self-acting bearings used to reduce friction and wear without the use of pressurized lubricants. They have this ability due to special patterns of grooves. Spiral groove bearings are self-acting because their own rotation builds up the pressure needed to separate the bearing surfaces. For this reason, they are also 'contact-less' bearings. ==Operation== Spiral groove bearings produce the required pressure to keep the bearing surfaces lubricated and separated by the wedging and pumping effect. When the parts of the bearings are rotated with respect to each other the grooves push the lubricants towards the small apertures between the surfaces causing an overall rise in the pressure. The motion of the surfaces will then cause the fluid to flow over the grooves and a pressure ripple, perpendicular to the direction of the motion, is formed. Between the flat surface of the bearings and the fluid, a pressure rise occurs because this flow is limited. At sufficient speeds and thicknesses of the film of fluid, the bearing surfaces are completely separated. It is the pressure acting perpendicular to the direction of motion that supports the bearing load. This explanation neglects the effects of inertia, compressibility of the lubricant and other factors.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Spiral groove bearing」の詳細全文を読む スポンサード リンク
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