Abstract: Damping devices, turbomachines, and methods of damping vibration are provided. For example, a damping device for damping vibration of a shaft rotatable about an axis of rotation is provided. The damping device defines radial and axial directions. The damping device comprises a bearing, a housing, and a damper element. The housing and damper element define a cavity therebetween for receipt of a damping fluid. The cavity has a length along the axial direction that is curved away from the axis of rotation. As another example, a turbomachine comprising a shaft rotatable about an axis of rotation includes a damping device positioned annularly about the shaft. The damping device comprises a housing and a damper element defining a cavity therebetween for receipt of a damping fluid that has a curved shape. The cavity is curved in a plane extending along the radial and axial directions and including the axis of rotation.

Abstract: The present invention provides a rotating-layering mold whereby a punched sheet is rotated according to a prescribed angle and layered by an upper mold and a lower mold working in tandem, and provides a press apparatus comprising the rotating-layering mold. A rotating-layering mold comprises a squeeze ring in which is provided a holding hole for holding a punched sheet, the squeeze ring being capable of rotating with respect to a lower mold so that an upper outer circumferential surface of the squeeze ring lies along an inner circumferential surface of the lower mold. The rotating-layering mold further comprises a first thrust bearing, a second thrust bearing, and a radial bearing in order to support the rotation of the squeeze ring with respect to the lower mold.

Abstract: A positioning system moves an object in two generally orthogonal directions using a rotationally adjustable bearing system that connects the object to two pairs of non-parallel rails, the bearing system permitting the object to be smoothly translated in one or two directions to a desired position in planar space. This translation is performed smoothly notwithstanding a lack of parallelism between the linear rails.

Abstract: Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.

Abstract: The present invention relates to the use of a diester of the following formula (I): Ra—C(O)—O—([C(R)2]n—O)s—C(O)—Rb??(I), as an additive to improve the anti-wear properties of a lubricant composition comprising one or more anti-wear additive(s).

Abstract: The present disclosure relates to gearboxes for aircraft gas turbine engines, in particular to arrangements for journal bearings such gearboxes, and to related methods of operating such gearboxes and gas turbine engines. Example embodiments include a gearbox for an aircraft gas turbine engine, the gearbox comprising: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.

Abstract: Provided is a main bearing for a wind turbine, including a stationary ring and a rotating ring to be coupled to a rotor, whereby the main bearing is a fluid film bearing including several bearing units arranged at the stationary ring around the circumference on both sides of the rotating ring, for radially and axially bearing the rotating ring, and further including a load measurement arrangement for determining measurement data which are a measure for the load applied to or resting on at least one of the axial or radial bearing units.

Abstract: The present invention relates to a mechanical system (1), comprising a bearing (4) and a shaft (10) coupled to the bearing (4), especially for an internal combustion engine, being subjected to average contact pressures of less than 200 MPa. The shaft (10) has at least one area (12) provided with an anti-seizing surface coating (20), having a surface hardness at least twice that of the bearing (4), and a microtexturation (30) comprised of a set of individual microcavities (31), distributed in said area (12). The invention also relates to a method for manufacturing such a mechanical system (1).

Abstract: A device for clamping a rotatably mounted shaft element including: a housing element having an annular housing portion wherein the shaft extends in the axial direction; an elastically deformable annular clamping ring element arranged in the annular housing portion, wherein the clamping ring has a cross-sectional profile with a first profile portion, extending radially inward and protrudes radially through an annular circumferential opening; and a pressure chamber formed in the annular housing has at least one pressure chamber portion arranged radially on the inner side adjacently to at least one second profile portion of the clamping ring; wherein the rotatably mounted shaft in a rest state clamped by frictional engagement with the first profile of the clamping ring protruding toward the shaft, and wherein the frictional engagement between the shaft and the first profile is releasable, the clamping ring is elastically deformable radially outward by pneumatic or hydraulic pressure chamber.

Abstract: A mechanical gearbox for aircraft includes a sun gear with an external toothing, a ring gear with an internal toothing, and planet gears which are meshed with the sun gear and the ring gear and which each have a first toothing of average diameter D32 meshed with the toothing of the sun gear, and a second toothing of average diameter D28, different from D32, meshed with the internal toothing of the ring gear. The planet gears are guided by hydrodynamic bearings which each include a first smooth guiding surface extending at least partly under the first toothing, and a second smooth guiding surface extending at least partly under the second toothing.

Abstract: A method for monitoring a condition of a sliding bearing operated with lubricating oil for a rotating component includes calculating, by a control unit as an output variable of a sliding bearing model, a calculated value of a minimum gap thickness of the sliding bearing. The calculated value is calculated by orbit analysis from at least one physical sliding bearing model to which at least a rotational speed of the rotating component, a bearing load, and a temperature of the sliding bearing are supplied as input variables. The method further includes measuring, with at least one sensor, a minimum gap thickness to provide a measured value of the minimum gap thickness, and comparing the measured value of the minimum gap thickness with the calculated value of the minimum gap thickness for the purpose of adjustment.

Abstract: A vehicle-use resin module including a strength member made of synthetic resin and including a mounting hole, and an attachment member attached to the mounting hole and configured to be subjected to an external force. The attachment member includes an outer fitting having a tubular part arranged in the mounting hole in an inserted state. The outer fitting includes an outer circumferential projection projecting to a radially outer side of the tubular part. The strength member is an insertion-molded component having a structure in which the outer circumferential projection of the outer fitting is embedded so as to be inserted inside a circumferential wall of the mounting hole. A surface of the tubular part of the outer fitting and a surface of the outer circumferential projection are each directly fixed to the strength member with an adhesive.

Abstract: A method of manufacturing a rotational electric machine rotor includes: forming a rotor shaft having a non-circular sectional outer shape; forming a rotor core by stacking a predetermined number of magnetic body thin plates each including a center hole having a non-circular shape corresponding to the non-circular sectional outer shape of the rotor shaft; and forming a protruding part for fixing the rotor core and the rotor shaft to each other by inserting the rotor shaft into the non-circular center hole of the rotor core and squashing the rotor shaft extending out of an axial-direction end face of the rotor core by using a predetermined swaging jig to expand the rotor shaft outward beyond an outer periphery of the non-circular section along the axial-direction end face of the rotor core.

Abstract: A processing apparatus includes a processing unit. The processing unit includes a spindle, a spindle housing having an air bearing for rotatably supporting the spindle by using air, and a tool mounted on the front end of the spindle. The spindle housing has an air supply passage for supplying air to the air bearing, an air supply port connected to the air supply passage, an air discharge passage, and an air discharge port. The air supply port is connected through an air supply line to an air source. The air supply line is provided with a pressure gauge and a flowmeter. A first allowable value is previously set for the pressure to be detected by the pressure gauge, and a second allowable value is previously set for the flow rate to be detected by the flowmeter.

Abstract: The invention relates to a bearing device comprising a first surface and a second surface which are moveable relative to one another, wherein the first and second surfaces are separated by a bearing gap filled with a lubricant, which is a magnetorheological or electrorheological liquid, or a lubricant having a temperature dependent viscosity, or a lubricant having a controllable slip velocity. The bearing device further comprising one or more supply inlets in the first or second surface, and one or more activators embedded in the first surface or second surface and configured to locally increase a viscosity or decrease the slip velocity of the lubricant in at least one obstruction zone, thereby inhibiting a flow of the lubricant in the obstruction zone.

Abstract: A resolver that ensures improvement in a detection sensitivity is provided. The resolver according to the present disclosure includes a rotor and a stator arranged to surround an outer peripheral surface of the rotor. The rotor includes a rotor core, the stator includes a stator core and a coil, the stator core includes a plurality of teeth disposed at intervals along a circumferential direction, the plurality of teeth project toward the outer peripheral surface side of the rotor, and the coil is wound around the plurality of teeth. A gap permeance between the rotor and the stator varies in association with a rotation around a rotation axis of the rotor. The rotor further includes a porous machinable film containing a magnetic metal, and the porous machinable film is disposed on a projecting portion on an outer peripheral surface of the rotor core.

Abstract: A method of manufacturing a rotational electric machine rotor includes: forming a rotor shaft having a non-circular sectional outer shape; forming a rotor core by stacking a predetermined number of magnetic body thin plates each including a center hole having a non-circular shape corresponding to the non-circular sectional outer shape of the rotor shaft; and forming a protruding part for fixing the rotor core and the rotor shaft to each other by inserting the rotor shaft into the non-circular center hole of the rotor core and squashing the rotor shaft extending out of an axial-direction end face of the rotor core by using a predetermined swaging jig to expand the rotor shaft outward beyond an outer periphery of the non-circular section along the axial-direction end face of the rotor core.

Abstract: A bearing device, a compressor and a method, in which a first radial bearing element is measured in at least the radial direction, an axial distance of the first axial bearing element from the first radial bearing element being measured, the second radial bearing element being measured in at least the radial direction, the first radial bearing element being positioned with respect to the second radial bearing element as a function of the predefined first width of the radial gap, the adjustment arrangement being situated in such a way that the axial gap has the predefined second width.

Abstract: A gas dynamic pressure bearing includes a shaft centered on a central axis extending in an up-down direction, and a sleeve that faces at least a portion of the shaft in a radial direction. The portion in which the sleeve and the shaft face each other in the radial direction includes a first dynamic pressure portion at each of both ends in the axial direction, and a second dynamic pressure portion between the first dynamic pressure portions. In the first dynamic pressure portion, one of the sleeve and the shaft includes dynamic pressure grooves arranged in a circumferential direction. A sum of center angles of groove widths of the dynamic pressure grooves in a cross-section cut along a plane orthogonal to the central axis is about 144° or more and about 216° or less.

Abstract: A rotary machine include: a rotational shaft; an impeller mounted to the rotational shaft; an impeller housing accommodating the impeller; a bearing housing accommodating a bearing which supports the rotational shaft rotatably, the bearing housing being fastened to the impeller housing; and a fastening member fastening the impeller housing and the bearing housing in an axial direction of the rotational shaft. The impeller housing, the bearing housing, and the fastening member each includes a contact surface in a direction intersection with an axial direction of the rotational shaft. A thin-plate member formed separately from the impeller housing, the bearing housing, and the fastening member is interposed between at least two of the contact surfaces.

Abstract: A lubricating agent including an ionic liquid formed from a Bronsted acid (HX) and a Bronsted base (B), wherein the Bronsted base has a linear hydrocarbon group having 10 or more carbon atoms and the difference between the pKa value of the Bronsted acid in water and the pKa value of the Bronsted base in water is 12 or more.

Abstract: A motor includes a shaft, a shell, a sleeve, an abrasion-resistance piece, a bearing, an oil seal, and several compressed springs. The shaft has an axial line. The shell is connected to the shaft. The sleeve has an accommodating space, and the wall of the accommodating space forms a first inclined surface which is inclined at an angle with respect to the axial line. The abrasion-resistance piece is disposed at the bottom of the accommodating space. The bearing is disposed in the accommodating space, and the outer wall of the bearing forms a second inclined surface corresponding to the first inclined surface. The shaft passes through the bearing and abuts the abrasion-resistance piece. The oil seal is affixed to the wall of the accommodating space and covers the bearing. The compressed springs are connected between the oil seal and the bearing.

Abstract: A camera lens suspension assembly includes a support member including a support metal base layer formed from a first unitary metal component, comprising a bearing plate portion in the support metal base layer. The assembly also includes a moving member including a moving metal base layer formed from a second unitary metal component and mounted to the support member, comprising a moving plate portion in the moving metal base layer, and flexure arms in the moving metal base layer extending from the moving plate portion and coupled to the support member. The assembly further includes a plurality of bearing-retaining recess between the bearing plate portion of the support member and the moving plate portion of the moving member, and ball-bearings within the bearing-retaining recesses, and between and engaging the bearing plate portion and the moving plate, to enable movement of the moving member with respect to the support member.

Abstract: The axial bearing arrangement comprises a first axial bearing plate (12) and a second axial bearing plate (13) each having an annular ring shape, the first axial bearing plate (12) having a first surface (12.1) axially facing the second axial bearing plate (13) and a second surface (12.2) opposite to the respective first surface (12.1), the second axial bearing plate (13) having a first surface (13.1) axially facing the first axial bearing plate (12) and a second surface (13.2) opposite to the respective first surface (13.1); a spacer ring (14) clamped between the first surfaces (12.1, 13.1) of the first and second axial bearing plates (12, 13), the spacer ring (14) defining an axial distance between the first and second axial bearing plates (12, 13); and a bearing sleeve (15) abutting the second surface (13.2) of the second axial bearing plate (13) and being secured to a compressor block (16).

Abstract: A sliding member (1) is formed of a sintered compact. The sintered compact includes: a base layer (3), which mainly contains an Fe-based structure and further contains 1.0 wt % to 5.0 wt % of Cu, a metal having a melting point lower than a melting point of Cu, and C; and a sliding layer (2), which is sintered together with the base layer (3) in a state of being held in contact with the base layer (3) and has a sliding surface (A). The sliding layer (2) mainly contains an Fe-based structure containing at least one kind of alloy element selected from Ni, Mo, Mn, and Cr and further contains Cu and C, and the content of Cu in the sliding layer (2) is larger than the content of Cu in the base layer.

Abstract: A system includes a monitoring system to monitor an operational parameter of a bearing assembly within a hydraulic turbocharger. The bearing monitoring system includes at least one sensor to monitor a relative position or operational parameter of one or more rotating components of the bearing assembly.

Abstract: In a fan motor, a stator unit of a motor that rotates an impeller includes a cylindrical bearing holder that extends in an axial direction, a cover that covers an end of the bearing holder on one side in the axial direction, and a seal provided between the bearing holder and the cover. The cover has a disc portion that is provided on the end on the one side in the axial direction and extends in the radial direction, and a cylindrical portion that extends from the disc portion to the other side in the axial direction, and is located inside of the end. The seal has a first seal portion located between an inner side face of the end and an outer side face of the cylindrical portion in the radial direction.

Abstract: A displaceable carriage (10) and a linear guide for guiding the carriage, which includes a first guide path slideway (13, 31) and a second guide path slideway (32). To form the first slideway (13, 31), the carriage (10) includes at least one pocket (13), which slides along the first guide path part (31) and can hold lubricant under pressure to create a relieving force on the carriage (10). The second guide path part (32) includes an island-shaped surface to create a frictional force on the carriage (10). A pressure medium held in the at least one pocket (13, 14, 15) creates the relieving force, whereby the first slideway (13, 31) relieves the load on the second slideway (11a, 12a, 12b, 32).

Abstract: A fluid dynamic bearing device includes a shaft disposed along a center axis, a sleeve cylindrically extending around the shaft, a thruster that closes a lower end of the sleeve, dynamic pressure grooves in the shaft or the sleeve, and a lubricating oil present therebetween. The shaft includes a shaft main body and a shaft flange extending radially outward from a lower end of the shaft main body. An inner peripheral surface of the sleeve includes a first inner peripheral surface that faces an outer peripheral surface of the shaft main body in the radial direction and a second inner peripheral surface that faces an outer peripheral surface of the shaft flange in the radial direction. The sleeve includes a sleeve inner lower surface and a circulation hole.

Abstract: A method of monitoring the amount of lubricant inside a bearing of a wind turbine is provided. The bearing includes a lubricant for reducing wear and fatigue of the bearing, a seal for minimizing the amount of lubricant which is leaking out of the bearing, a ventilation device with at least one pressure compensation hole for enabling a pressure compensation between the sealed bearing and the ambient, and a lubricant drain hole for enabling lubricant to exit the bearing in a controlled manner. The method includes the steps of blowing a compressed medium through the pressure compensation hole into the bearing; measuring the pressure inside the bearing; and determining the amount of lubricant inside the bearing based on the measured pressure.

Abstract: In an exhaust gas turbocharger, comprising a first radial bearing and a second radial bearing configured for the radial support of a shaft of the exhaust gas turbocharger, wherein the first radial bearing comprises a bearing axis extending in alignment with the bearing axis of the second radial bearing which is arranged spaced from the first radial bearing, a third radial bearing with a third bearing axis, which is extends parallel to, but at a distance (E) from, the first bearing axis and the second bearing axis is arranged between the first and second radial bearings.

Abstract: An auxiliary compressor for a gas turbine engine is disclosed. The auxiliary compressor includes a first axial rotor, a second axial rotor positioned downstream of the first axial rotor, and a centrifugal impeller positioned intermediate the first axial rotor and the second axial rotor and operably coupled to the first axial rotor.

Abstract: A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.

Abstract: A method for lubricating a radial bearing of a food cutter assembly is disclosed. The method can include receiving a supply of water at a housing for rotationally mounting a spindle body having a rotational axis, where the housing includes a radial bearing proximate to a thrust disc of the spindle body. The thrust disc can include opposing surfaces extending radially from the rotational axis of the spindle body and a circumferential surface between the opposing surfaces. The water can be directed through fluid passages extending from a port in the housing through the radial bearing to the spindle body and across the opposing surfaces and the circumferential surface to the spindle body. The spindle body may be rotated while the water is directed through the fluid passages to create a water film between the housing and the spindle body that reduces friction between the housing and the spindle body.

Abstract: A squeeze film damper bearing device includes an inner race that is fitted around an outer periphery of a rotating shaft, an outer race that is supported on an inner periphery of a bearing retaining member via an annular space, a plurality of rolling bodies that are disposed between the inner race and the outer race, and an oil supply source that supplies oil to the annular space via an oil passage so as to form a squeeze film. The device further includes an open/close valve that opens and closes the oil passage. When a rotational speed of the rotating shaft reaches a predetermined rotational speed, the open/close valve is controlled so as to change oil pressure of the squeeze film, thus changing vibration characteristics of the rotating shaft.

Abstract: A linear guide includes an elongate guide body and a bearing cage, on the inner sides of which fluid pressure bearings are provided. The bearing cage moves along the guide body via the bearings. The bearing cage includes at least three interconnected plates. The plates each have an inner surface facing the guide body, an outer surface facing away from the guide body and side surfaces between the inner and the outer surface. Each plate is connected to a first other plate in a first end region and connected to a second other plate in an opposite second end region. For each of the plates: the first other plate, with its inner surface, abuts against a side surface of the considered plate, while the considered plate, with its inner surface, abuts against a side surface of the second other plate in the second end region of the considered plate.

Abstract: An apparatus is provided including a shaft, wherein the shaft is stationary. A rotatable component is configured to rotate with respect to the shaft. A fluid is operable to flow between the shaft and the rotatable component. A limiter is at a first axial end of the shaft, and a cup is at a second axial end of the shaft. An axially extending grooved region is between the limiter and the rotatable component.

Abstract: A bearing assembly is provided. The bearing assembly includes an inner race configured to couple to a shaft, an outer race disposed around the inner race, and a housing disposed around the outer race. The housing and the outer race define an annulus and a buffer region, and the buffer region defines an axial boundary of the annulus.

Abstract: A non-contact bearing is provided. In a suspended state, the non-contact bearing is disposed with a predetermined spacing to a first guide surface. The non-contact bearing includes: a bearing body and a micro electro mechanical layer. The bearing body includes a second guide surface, wherein the second guide surface is opposite to the first guide surface. The micro electro mechanical layer is disposed on the second guide surface, and includes at least one micro sensor and/or at least one micro actuator.

Abstract: In certain embodiments, a motor includes a shaft positioned adjacent a sleeve for relative rotation. The sleeve includes a first radial recirculation channel. The shaft and sleeve form first and second gaps. The first gap is configured to form a pump seal, is positioned above the first radial recirculation channel, and has a width measured between the shaft and sleeve. The second gap is configured to form a journal bearing, is positioned below the first radial recirculation channel, and has a width measured between the shaft and sleeve. The width of the first gap is greater than the width of the second gap.

Abstract: A bearing structure includes: a shaft; an oil-impregnated bearing that supports the shaft to be rotatable and includes a first sintered metal material having a first density; a bearing holder that supports an outer circumferential surface of the oil-impregnated bearing; and a seal member that is provided at an opening of the bearing holder, wherein the shaft is provided with an annular groove having a side surface portion that has an outer diameter that decreases as the side surface portion separates away from one end surface of the oil-impregnated bearing, and wherein the seal member includes a second sintered metal material having a second density that is lower than the first density of the first sintered metal material.

Abstract: Disclosed is a yarn management device in a yarn treatment line downstream of a crimping box and upstream of a thermofixing means for crimping, said device including a fixed support and at least one axial drum positioned upstream of the thermofixing means. In some cases, the inlet of the crimping box is formed by one or more crimping rollers for feeding at least one yarn into the crimping box. The drum is traversed by a yarn in the crimping box and mounted on the fixed support of the device so as to perform a substantially axial rotation, allowing the generation of at least one false twist on the treated yarns.

Abstract: A bushing is provided for adjusting to differences in diameter between concentric elements of an assembly. The bushing may be provided with a plurality of leaf springs coupled to one another to form parts of a wall. The bushing wall may have a first contact face and a second contact face opposite the first contact face. The bushing wall may also be configured to be positioned in a generally annular shape. Each of the leaf springs forming part of the bushing wall may be radially deflectable relative to each of the other leaf springs in order to self-align the bushing by the resilient response of each leaf spring.

Abstract: A cooling sleeve for a bearing as well as a corresponding bearing, the cooling sleeve including a radial flange having a central passage opening, in which a bearing sleeve may be accommodated, in particular with the aid of a press-fit. In order to keep a mechanical stress at a low level, slits extending radially outwardly originate from the central passage opening.

Abstract: The positioning of a cylindrical workpiece (that has to be machined by grinding) can be performed particularly precisely if the workpiece abuts to at least one, preferably two, static supporting elements and is fixed in a collet of a spindle, which allows a wobble compensation as well as a radial displacement of the spindle axis relative to the longitudinal axis of the workpiece.

Abstract: An aerostatic bearing includes a base having a foundation layer and a plurality of ventilation bodies protruding from the foundation layer, the ventilation bodies being made of a porous material; and a sealing layer covering the base and revealing at least one of the ventilation bodies.

Abstract: Provided is a fluid dynamic bearing device (1) including a rotary body (2A), a bearing member (22) (sleeve portion) made of a sintered metal arranged on the rotary body (2A), having end surfaces (22b, 22c), a thrust bearing gap formed by a lower end surface (22c) of the bearing member (22), filled with lubricating oil (11), and a thrust dynamic pressure generating portion (B). A dynamic pressure generating action is caused in the lubricating oil in the thrust bearing gap along with rotation of the rotary body (2A) to support the rotary body (2A) in one thrust direction in a non-contact manner. The bearing member (22) has an oil permeability of 4% or more with respect to a mass flow rate of the lubricating oil (11) flowing along the thrust dynamic pressure generating portion (B) during the rotation of the rotary body (2A).

Abstract: A compressor includes a plurality of gas bearing conduits and a plurality of gas bearing control valves. Each gas bearing control valve of the plurality of gas bearing control valves is coupled to a respective one of the plurality of gas bearing conduits. The gas bearing control valves are configured for permitting fluid flow through the gas bearing conduits when a piston of the compressor is positioned adjacent the gas bearing conduits in a chamber of the compressor.

Abstract: The present invention discloses an active airbearing device, including a airbearing body, a gas film active adjusting unit, a support body detection unit and a drive control unit, wherein the support body detection device measures a state of airbearing, the drive control system generates a control signal according to a detection signal, drives and controls the gas film active adjusting device to generate an active action, and dynamically adjusts the form of gas films on a airbearing surface, so as to dynamically adjust pressure distribution of gaps between the gas films of the airbearing device, thereby improving dynamic stiffness characteristics of the airbearing.

Abstract: A motor includes a shaft, a rotor shell, a bushing, a bearing, and a thrust plate. The rotor shell is connected with the shaft. The bushing has an accommodating space. The bearing is disposed in the accommodating space, and the shaft is disposed through the bearing. The thrust plate is connected with the shaft, and is disposed between a bottom of the accommodating space and a bottom of the bearing. At least one surface of the thrust plate is formed with a plurality of grooves tapering off from an edge to a center.