Abstract: An operation device including a combination of a rotation unit and a linear motion unit. The rotation unit includes a link actuation apparatus and a rotation actuator. The link actuation apparatus includes a proximal end side-link hub, and a distal end side-link hub coupled thereto through three or more link mechanisms so as to enable a varying attitude relative thereto. The link actuation apparatus is mounted to an output shaft of the rotation actuator such that a central axis of the proximal end side-link hub forms an angle relative to an axis of rotation of the rotation actuator. The linear motion unit includes a linear actuator serving as an output portion thereof, and the rotation unit is mounted to this linear actuator.

Abstract: Provided is a foil bearing, an air film is formed in a radial bearing gap between a first bearing surface arranged on a top foil and a second bearing surface along with rotation of a shaft, and the shaft is supported with a pressure of the air film. Lubricating powder is interposed between the bearing surfaces. The top foil is partially elastically deformed in a width direction of the radial bearing gap in accordance with the pressure of the air film generated in the radial bearing gap, thereby being alternately shifted between a first state in which a retaining portion capable of retaining the lubricating powder is formed and a second state in which the retaining portion substantially disappears, and shifted from the second state to the first state along with an increase in the pressure of the air film.

Abstract: Provided is a foil bearing, an air film is formed in a radial bearing gap between a first bearing surface arranged on a top foil and a second bearing surface along with rotation of a shaft, and the shaft is supported with a pressure of the air film. Lubricating powder is interposed between the bearing surfaces. The top foil is partially elastically deformed in a width direction of the radial bearing gap in accordance with the pressure of the air film generated in the radial bearing gap, thereby being alternately shifted between a first state in which a retaining portion capable of retaining the lubricating powder is formed and a second state in which the retaining portion substantially disappears, and shifted from the second state to the first state along with an increase in the pressure of the air film.