A bearing cage for a rotor bearing of a turbomolecular pump. The bearing cage includes a plurality of bearing pockets each of which, in use, houses a bearing ball such that the bearing ball operably engages an inner race and an outer race of the rotor bearing. Each bearing pocket of the bearing cage has a primary chamber for housing the bearing ball and each bearing pocket further includes a sump.

A bearing cage for a rotor bearing of a turbomolecular pump. The bearing cage includes a plurality of bearing pockets each of which, in use, houses a bearing ball such that the bearing ball operably engages an inner race and an outer race of the rotor bearing. Each bearing pocket of the bearing cage has a primary chamber for housing the bearing ball and each bearing pocket further includes a sump.

A full-floating bearing includes: an outer peripheral groove having a groove width larger than a value of 0.69, which is a value obtained by subtracting a chamfer width as a width of a chamfered portions in a center axis direction and the groove width as a width of the groove in the center axis direction from a total width being a width of a main body in the center axis direction and dividing a net width by a total width.

A full-floating bearing includes: an outer peripheral groove having a groove width larger than a value of 0.69, which is a value obtained by subtracting a chamfer width as a width of a chamfered portions in a center axis direction and the groove width as a width of the groove in the center axis direction from a total width being a width of a main body in the center axis direction and dividing a net width by a total width.

A blower includes a rotor, a motor adapted to drive the rotor, at least one bearing to rotatably support the rotor, a stationary component, and a bearing sleeve provided to the stationary component. The bearing sleeve is structured and arranged to support and retain the bearing to the stationary component. The bearing sleeve comprises an elastomeric material, and the bearing sleeve comprises one or more bumps or ribs configured to engage along an outer ace of the bearing.

A blower includes a rotor, a motor adapted to drive the rotor, at least one bearing to rotatably support the rotor, a stationary component, and a bearing sleeve provided to the stationary component. The bearing sleeve is structured and arranged to support and retain the bearing to the stationary component. The bearing sleeve comprises an elastomeric material, and the bearing sleeve comprises one or more bumps or ribs configured to engage along an outer ace of the bearing.

A compressor system includes a compressor including a rotary shaft, an impeller, and a casing, a motor including a motor rotor disposed coaxially with the rotary shaft, and a coupling shaft coupling the motor rotor to the rotary shaft. The compressor includes a compressor bearing that rotatably supports the rotary shaft, and a compressor connecting hub that is fixed to the rotary shaft at a position where the compressor connecting hub overlaps the compressor bearing in the axial direction and at a position on an inner side in the radial direction. The coupling shaft is allowed to alleviate misalignment with the compressor connecting hub. The compressor bearing rotatably supports an outer peripheral surface of the compressor connecting hub.

A compressor system includes a compressor including a rotary shaft, an impeller, and a casing, a motor including a motor rotor disposed coaxially with the rotary shaft, and a coupling shaft coupling the motor rotor to the rotary shaft. The compressor includes a compressor bearing that rotatably supports the rotary shaft, and a compressor connecting hub that is fixed to the rotary shaft at a position where the compressor connecting hub overlaps the compressor bearing in the axial direction and at a position on an inner side in the radial direction. The coupling shaft is allowed to alleviate misalignment with the compressor connecting hub. The compressor bearing rotatably supports an outer peripheral surface of the compressor connecting hub.

Provided is an axial fan including a pair of fan units, wherein each of the pair of fan units includes a rotor, a motor, and a housing, the rotor includes an impeller cup configured to rotate about a rotation axis, and a fan extending radially from the impeller cup, the motor is provided inside the impeller cup, the housing includes a housing portion housing the rotor, and a base portion supporting the motor, a connection portion is provided to an axial end surface of the base portion and on an inner peripheral side relative to the impeller cup, and the pair of fan units is connected to each other via the connection portions in a direction of the rotation axis.

Provided is an axial fan including a pair of fan units, wherein each of the pair of fan units includes a rotor, a motor, and a housing, the rotor includes an impeller cup configured to rotate about a rotation axis, and a fan extending radially from the impeller cup, the motor is provided inside the impeller cup, the housing includes a housing portion housing the rotor, and a base portion supporting the motor, a connection portion is provided to an axial end surface of the base portion and on an inner peripheral side relative to the impeller cup, and the pair of fan units is connected to each other via the connection portions in a direction of the rotation axis.