Abstract: A temperature control system for a machine tool is equipped with a first temperature control device configured to control the temperature of gas supplied to a gas bearing, a second temperature control device configured to control the temperature of a room interior and to issue a notification of its own operation state to the outside, a gas supply section configured to supply gas whose temperature has been controlled by the first temperature control device, and a gas supply control section configured to perform the gas supply control of the gas supply section so that gas is distributed to both of the gas bearing and an interior space, when receiving the notification that the operation state of the second temperature control device is abnormal.

Abstract: In a mud-lubricated bearing assembly for a downhole motor, a mechanical seal is provided between the mandrel and the lower end of the bearing housing to prevent discharge of drilling fluid (mud) from the bearing assembly into the wellbore annulus. The mechanical seal is effected by mating wear-resistant annular contact surfaces provided on the mandrel and the bearing housing, with biasing means preferably being provided to keep the contact surfaces in sealing engagement during both on-bottom and off-bottom operational modes. The diverted drilling fluid passing through the bearings is redirected into the bore of the mandrel via ports through the mandrel wall to rejoin the main flow to the drill bit, such that substantially all of the drilling fluid flows through the bit.

Abstract: There is provided a spindle motor including: a hub moving together with a shaft; a sleeve supporting the shaft with oil; a stopper provided in the hub to thereby prevent excessive floating of the shaft; and oil storage parts formed on the stopper so as to be in communication with the outside, providing a storage space for the oil, and allowing an oil interface to be formed therein.

Abstract: A shock absorption device for a motor bearing system, including a washer, an end cover, a bearing, a rotating shaft, a retaining ring, a cap, and a shock absorption pad. The bearing is disposed in a bearing seat of the end cover. The rotating shaft abuts against the bearing. The washer is disposed on the rotating shaft and on one side of the bearing. The retaining ring is buckled on the rotating shaft and axially positions the washer. The cap is disposed on the periphery of the washer, and on the end cover. The shock absorption pad is disposed on the end cover. The washer is disposed between the shock absorption pad and the retaining ring. The shock absorption pad axially separates the washer from the bearing, and end surface of the bearing seat.

Abstract: A system for cooling a bearing of a shaft of a motor comprises an oil sump adapted to collect oil that contacts a bearing enclosed within the sump; and a heat exchanger physically separated from the sump and the bearing, the heat exchanger adapted to be in fluid communication with the sump and the bearing.

Abstract: The invention relates to a fluid dynamic bearing, particularly for rotatably supporting a spindle motor comprising: a first bearing part (16) having a substantially cylindrical bore, a substantially cylindrical second bearing part (20) that is disposed in the bore of the first bearing part (16) and rotatably supported about a rotational axis (50) with respect to the first bearing part, the bearing parts having associated radial bearing faces and axial bearing faces, or tapered bearing faces, a bearing gap (22) filled with bearing fluid that separates the mutually facing surfaces of the two bearing parts (16, 20) from one another and has an open end and a closed end remote from the open end, a sealing gap (40) that is disposed between an outside circumference of the first bearing part (16) and an inside circumference of a part connected to the second bearing part (20) and connected directly or indirectly to the bearing gap (22), a recirculation channel (44) that is disposed in the first bearing part (16) an

Abstract: A MacPherson strut tube having an upper spring seat, a spring, a strut tube, and a ring bearing disposed for engaging the spring seat, the spring and the strut tube. The ring bearing comprises an upper casing, a lower casing, and a plastic ring engaged between the upper and lower casings, thereby forming said ring bearing.

Abstract: A ring spindle assembly and process for re-lubricating a ring spindle having a vertically arranged bearing housing with a closed bottom. A step bearing is arranged in an oil-bath of the bearing housing for a rotating shaft. In the bearing housing, at least two lubricating channels are provided above the desired oil level of the oil-bath. When the shaft remains in the bearing housing, oil is filled into one lubricating channel until oil comes out of the other lubricating channel. A certain amount of oil is subsequently sucked out through the lubricating channel, so that the oil reaches the desired level.

Abstract: A spindle of a machine center is held in a spindle sleeve directly straightly driven by a servo-controlled motor aligned with the spindle axis for preventing any bending or twisting caused to the rotating spindle during cutting operation and having a plurality of longitudinal cooling passages parallelly longitudinally formed in the spindle sleeve proximate to an upper and a lower bearings disposed around the spindle for enhancing the cooling effect of the running spindle, and having a direct application of cooling oil mist or gas stream into the bearing systems of the spindle to greatly minimize any frictional heat or temperature raise caused from the running spindle to prevent a thermal expansion influencing the processing precision of the cutting operation.

Abstract: A bearing assembly for a spinning or twisting spindle shaft is provided which includes at least one support bearing device for supporting a shaft. A lubricant feeding and discharging duct member is provided for feeding and discharging lubricant to and from the support bearing device. The lubricant feeding and discharging duct member includes an outlet discharging member for discharging lubricant out of a bearing housing.