A pump device is provided. In the pump device, a bottom portion of a case body with a suction port formed therein is provided with a through-hole through which a fluid sucked through the suction port passes, and the case body is provided with a shaft holding portion holding the lower end of the fixed shaft and a plurality of connection portions disposed with a space interposed therebetween in the circumferential direction of the rotor so as to surround the through-hole and connecting the shaft holding portion and the bottom portion. The upper end side of the connection portion is provided with a protrusion protruding upward beyond the upper end surface of the shaft holding portion, and at least one of the protrusions is a rotation preventing portion that prevents rotation of the thrust bearing in the circumferential direction of the rotor.

A pump device is provided. In the pump device, a bottom portion of a case body with a suction port formed therein is provided with a through-hole through which a fluid sucked through the suction port passes, and the case body is provided with a shaft holding portion holding the lower end of the fixed shaft and a plurality of connection portions disposed with a space interposed therebetween in the circumferential direction of the rotor so as to surround the through-hole and connecting the shaft holding portion and the bottom portion. The upper end side of the connection portion is provided with a protrusion protruding upward beyond the upper end surface of the shaft holding portion, and at least one of the protrusions is a rotation preventing portion that prevents rotation of the thrust bearing in the circumferential direction of the rotor.

A variable mass flywheel arrangement comprising a shaft with a flywheel fixedly connected thereto. The flywheel comprises a cavity with at least one inlet thereto. The inlet into the cavity is in fluid communication with a source of particulate matter and the particulate matter is able to pass into the cavity of the flywheel via the inlet.

A process fluid lubricated pump includes a pump having a pump shaft extending from a drive end to a non-drive end, first and last stage impellers, a drive unit exerting torque on the drive end to rotate the pump shaft, a balance drum connected to the pump shaft between the pump and the drive end, the balance drum defining a drum front side facing the pump and a drum back side, a relief passage between the balance drum and a first stationary part configured to be stationary with respect to a housing, the relief passage extending from the drum front side to the drum back side, the pump shaft radially supported in a non-contacting manner during operation of the pump, and a hydrodynamic radial pump bearing supporting the pump shaft, the radial pump bearing arranged at the non-drive end or at the drive end of the pump shaft.

A bearing system includes a first bearing, a second bearing, and a rotating member. The first bearing is hollow and has a first inner face. The second bearing is located in the first bearing. The second bearing includes a second inner face axially aligned with the first inner face. A partitioning space is formed between the first inner face and the second inner face. The rotating member has a shaft and a protruding portion coupled to the shaft. The protruding portion is located in the partitioning space. A dynamic pressure gap is formed between the protruding portion and the first inner face during rotation. Another dynamic pressure gap is formed between the protruding portion and the second inner face during rotation.

A hydrodynamic thrust bearing pad includes a composite laminate including at least one ply including a plurality of fibers oriented in at least one direction, and a bearing surface configured to confront a rotating thrust surface of a rotating shaft for transmitting axial thrust loads from the rotating shaft to the composite laminate. The bearing pad also includes a support surface configured to confront a stationary surface of a stationary housing for transmitting the axial thrust loads from the composite laminate to the stationary housing, and at least one side surface extending between the bearing and support surfaces. The at least one ply is configured to expand non-uniformly when heated from a first temperature to a second temperature for causing the composite laminate to warp from an unstressed state to a stressed state.

A hydrodynamic thrust bearing pad includes a composite laminate including at least one ply including a plurality of fibers oriented in at least one direction, and a bearing surface configured to confront a rotating thrust surface of a rotating shaft for transmitting axial thrust loads from the rotating shaft to the composite laminate. The bearing pad also includes a support surface configured to confront a stationary surface of a stationary housing for transmitting the axial thrust loads from the composite laminate to the stationary housing, and at least one side surface extending between the bearing and support surfaces. The at least one ply is configured to expand non-uniformly when heated from a first temperature to a second temperature for causing the composite laminate to warp from an unstressed state to a stressed state.

A bearing includes a shaft which pivots in the bearing. The shaft includes, at at least one end thereof, a shoulder via which the shaft is in contact with an opposite surface of the bearing. The shoulder is extended by a pivot engaged in a hole provided in the bearing. The opposite surface of contact of the bearing includes at least one hollow in order to reduce the surface of contact between the shoulder of the shaft and the bearing. Application is made to the production of a bearing for a shaft of a horology movement.

A rotating device according to the present invention includes a motor including an outer shell, a rotating shaft protruding from the outer shell, a first inner bearing supporting the rotating shaft, and a second inner bearing supporting the rotating shaft, a plurality of gears configured to transmit rotation of the motor to an external device, and a casing. A first outer bearing and a second outer bearing are arranged at the casing, and the first outer bearing and the second outer bearing rotatably support portions of the rotating shaft protruding from end surfaces at both sides of the outer shell in a longitudinal direction of the rotating shaft.

An adjustable axial gap of the thread rod assembly has a brace, a thread rod rotationally deployed onto the brace, a thread bearing for gripping one end of the thread rod is screwed into the first positioning hole of the brace, and one side of the thread bearing withstands against the thrust washer. The user may rotate the thread rod by applying force passing through the thrust washer onto the thread rod and shifting an axial moving of the thread rod to adjust the axial gap of the thread rod assembly which attains the merits of simple installation and easy application.