The provided is a bearing device for a crankshaft of an internal combustion engine including: a crankshaft having a plurality of journal portions; main bearings for supporting the crankshaft; and a bearing housing, wherein a range in which the oil groove of the upper-side halved bearing of the second main bearing is formed in the circumferential direction includes at least a range of a circumferential angle of 20° within the ±45° region, a circumferential end portion of the oil groove on a rotationally forward side communicates with the crush relief at a minimum, and is open to a circumferential end face at a maximum, and a circumferential end portion of the oil groove on the rotationally backward side of the journal portion is positioned on a circumferential center portion side of the upper-side halved bearing from a circumferential end face of the upper-side halved bearing.

A sleeve of a steering column includes (i) an outer tube and an inner tube that are movable relative to each other, and (ii) an adjustment system. The adjustment system includes a screw for adjusting the axial position along an adjustment axis constrained to move in translation with a first of the two elements by at least two guide bearings for rotationally guiding the adjusting screw about the adjustment axis. At least one of the bearings supporting the adjusting screw is a guide bearing with axial force take-up for blocking the translational movement of the adjusting screw.

A bicycle bearing system comprising: an integrated cup, the integrated cup having a non-flanged outer diameter; a plurality of rolling elements configured to abut and rotate against an inner surface of the cup race; an inner race configured to abut and rotate about the plurality of rolling elements, the inner race having an inner diameter; wherein the rolling elements do not have a separate outer race, but rather the inner surface of the integrated cup acts as the outer race to the rolling elements; wherein the rolling elements' sizes are maximized to the limitation that the non-flanged outer diameter is smaller or equal to a first maximum diameter, and wherein the rolling elements sizes are maximized to the limitation that the inner diameter is greater or equal to a first minimum diameter.

A bicycle bearing system comprising: an integrated cup, the integrated cup having a non-flanged outer diameter; a plurality of rolling elements configured to abut and rotate against an inner surface of the cup race; an inner race configured to abut and rotate about the plurality of rolling elements, the inner race having an inner diameter; wherein the rolling elements do not have a separate outer race, but rather the inner surface of the integrated cup acts as the outer race to the rolling elements; wherein the rolling elements' sizes are maximized to the limitation that the non-flanged outer diameter is smaller or equal to a first maximum diameter, and wherein the rolling elements sizes are maximized to the limitation that the inner diameter is greater or equal to a first minimum diameter.

Provided is a rotational positioning device capable of positioning a rotational angle at a target angle position with high precision. A rotational positioning device is provided with: a housing; a rotational member which is rotatable about a rotational member axial line and at least a part of which is accommodated in the housing; and at least one sensor installed in the housing. A graduated scale with a plurality of scale marks is formed integrally with the rotational member along the circumferential direction of the rotational member. The at least one sensor detects an angle change amount due to rotation of the rotational member on the basis of the plurality of scale marks. The rotational member is positioned at the target angle position on the basis of the angle change amount.

Provided is a rotational positioning device capable of positioning a rotational angle at a target angle position with high precision. A rotational positioning device is provided with: a housing; a rotational member which is rotatable about a rotational member axial line and at least a part of which is accommodated in the housing; and at least one sensor installed in the housing. A graduated scale with a plurality of scale marks is formed integrally with the rotational member along the circumferential direction of the rotational member. The at least one sensor detects an angle change amount due to rotation of the rotational member on the basis of the plurality of scale marks. The rotational member is positioned at the target angle position on the basis of the angle change amount.

Example aspects of a rotating machine, a method for pre-loading a rotating machine, and a method for using a rotating machine are disclosed. The rotating machine can comprise a stator; a rotor, wherein one of the stator and the rotor comprises a mounting flange formed monolithically therewith; a bearing directly mounted to the mounting flange; and the other of the stator and the rotor directly mounted to the bearing.

Example aspects of a rotating machine, a method for pre-loading a rotating machine, and a method for using a rotating machine are disclosed. The rotating machine can comprise a stator; a rotor, wherein one of the stator and the rotor comprises a mounting flange formed monolithically therewith; a bearing directly mounted to the mounting flange; and the other of the stator and the rotor directly mounted to the bearing.

A slewing bearing providing a first ring, a second ring, the rings being concentric around a central axis (X1), at least one row of rolling elements arranged between the rings in order to form an axial thrust that can transmit axial forces, at least one row of rolling elements arranged between the rings in order to form a radial thrust that can transmit radial forces, and at least one sealing assembly arranged between the first ring and the second ring. The sealing assembly provides first sealing means being arranged outside second sealing means, an annular sealed chamber being defined between the first sealing means and second sealing means.

A slewing bearing providing a first ring, a second ring, the rings being concentric around a central axis (X1), at least one row of rolling elements arranged between the rings in order to form an axial thrust that can transmit axial forces, at least one row of rolling elements arranged between the rings in order to form a radial thrust that can transmit radial forces, and at least one sealing assembly arranged between the first ring and the second ring. The sealing assembly provides first sealing means being arranged outside second sealing means, an annular sealed chamber being defined between the first sealing means and second sealing means.