Abstract: Provided are a magnetic coupling as an axial bearing including a driven magnet (11B3) that is a permanent magnet provided to a rotating body (11) inside a casing (12) and a drive magnet (23A) that is a permanent magnet placed face to face with the driven magnet in a radial direction of the rotating body outside the casing to be magnetically coupled with the driven magnet, a driving motor (22) that rotatably drives the drive magnet about an axis (P) of the rotating body, a radial bearing that is a dynamic bearing having annular bearing surfaces (12B1, 11B1) centering on the axis on an inner wall of the casing and the rotating body, each of the annular bearing surfaces being arranged with a gap between the drive magnet and the driven magnet in the radial direction of the rotating body, and a closed impeller (11A) including a front shroud (11A1) arranged on a front side in the axis direction in the rotating body, a rear shroud (11A2) arranged on a rear side in the axis direction of the front shroud, and a vane (

Abstract: A travel energy learning device includes: a road section identifying unit that identifies a road section where a host vehicle is currently located; a travel condition information obtaining unit that obtains travel condition information that indicates a travel condition when the host vehicle traveled the road section; a work rate deriving unit that derives information indicating work rate of a transmission shaft based on rate of rotation of the transmission shaft and torque transmitted by the transmission shaft; and an energy information accumulating unit that derives required energy information indicating the energy required for traveling the road section based on the derived information that indicates the work rate during travel of the road section, links the derived required energy information to the road section and the travel condition information, and accumulates the required energy information.

Abstract: In order to optimize the clearances between both end surfaces of a sleeve 5 and each of the end surfaces of the fixed bodies 3 and 5, respectively, magnetic forces of repulsion being caused by each of the permanent magnets 3a, 5b, 5c and 8a is adjusted. At this time, by adjusting each of the distances between the permanent magnets 3a, 5b, 5c, 8a, respectively, by adjusting the quantity of the adjustment rings 9, the magnetic force of repulsion being caused by each of the permanent magnets 3a, 5b, 5c and 8a is adjusted.

Abstract: A road section where the host vehicle is currently located is identified and the work rate of a transmission shaft, which transmits a driving force from a drive source of a host vehicle to a wheel, is derived based on a rotational speed and the torque transmitted by the transmission shaft. The energy required to travel through the road section is linked to the road section and accumulated based on the work rate derived while the host vehicle travels through the road section.

Abstract: By inserting a protruding portion 8b, which is installed to a center position of a rear end surface 8x of a fixed body 8, into a hole 4a, which is provided to a center position of an end surface 4x on a side of a fixed body 8 of a fixed shaft 4 that is connected to a fixed body 3, the fixed bodies 3 and 8 and the fixed shaft 4 are connected. As a result, a sleeve 5 can be removed only by dismantling the fixed body 3.