774results about "Elastic bearings" patented technology

The invention discloses a thrust bearing tilting pad structure and an injection system, a tilting pad comprises a pad seat and a filling medium, the pad seat comprises a supporting part, an elastic part and a mounting part which are sequentially arranged from bottom to top and are connected with one another, and the elastic part comprises a plurality of hollow pipes which are arranged side by side and are sequentially connected with one another; each hollow tubular structure is filled with the filling medium, the filling medium is formed by mixing a main agent and an auxiliary agent, the main agent has elasticity, and the auxiliary agent has viscidity. The tilting pad has the beneficial effects that when the hollow tubular structure encounters external impact, the filling medium can better buffer and disperse pressure, vibration generated in the working process of the tilting pad is effectively absorbed and attenuated, noise generated in the working process of the tilting pad is reduced, and by changing the preparation proportion of the main agent and the auxiliary agent, the tilting pad can be effectively prevented from falling off. The damping coefficient of the filling medium can be adjusted, and damping adjustability is achieved.

The utility model discloses a shockproof bearing, which belongs to the technical field of bearings and comprises a bearing body and a damping pad, the damping pad is arranged on the outer diameter of the bearing body, lock sleeves are arranged at two ends of the bearing body, exhaust holes are arranged on the outer diameters of the bearing body and the damping pad, and the exhaust holes are communicated with the lock sleeves. The outer diameter of the bearing body and the outer diameter of the damping pad are each provided with an oil injection hole, meanwhile, the outer diameter of the bearing body and the outer diameter of the damping pad are each provided with an oil outlet hole, four first fixing columns are fixedly installed on the outer diameter of the damping pad, and meanwhile the other ends of the first fixing columns are connected with second fixing columns in a sliding mode. In the actual use process, the stress borne by the bearing in the operation process can be dispersed, and when vibration or impact occurs, the stress can be absorbed and dispersed to a larger area by the buffering part instead of being concentrated on a certain part, so that the fatigue damage risk of the bearing part is reduced, and the service life of the bearing part is prolonged. And the bearing is not easy to generate fatigue cracks and other failure forms in the long-time use process.

The batten type water lubricated bearing comprises a shaft sleeve and a plurality of composite battens which are installed on the inner wall of the shaft sleeve at intervals in the circumferential direction of the shaft sleeve, and the composite battens comprise the first battens installed in a bearing area of the bearing and the second battens installed in a non-bearing area of the bearing. A through type variable cross-section groove is formed in the side, away from the ship stern shaft, of the first batten in the length direction of the first batten, and the cross-section area of the variable cross-section groove is gradually increased from the bow to the stern. The invention further discloses an assembly method of the batten type water lubricated bearing. The first batten is arranged in the bearing carrying area and provided with the variable cross-section groove, so that the rigidity of the first batten is gradually reduced in the direction from the bow to the stern, axial gradient rigidity distribution is formed, the low-rigidity area at the stern end can adapt to deformation of the stern shaft to be adjusted in a self-adaptive mode, local stress concentration is reduced, and the stability of the stern end is improved. And a high-rigidity area at the bow end maintains necessary bearing strength, so that the axial load of the bearing is homogenized as a whole.

A linear drive includes an output member which is linearly movable with respect to a drive housing, and which has a spindle nut and a hollow output rod connected thereto. The output member is linearly displaceable by means of a rotationally drivable threaded spindle, which is inserted through the spindle nut into the output rod. To support the threaded spindle, a support apparatus is provided at its anterior end section, which has a rolling bearing and a sliding sleeve seated thereon. The sliding sleeve is divided into sliding sleeve segments, which are connected to one another by resilient joints and are each prestressed with a support area section against the inner peripheral surface of the output rod.

The invention discloses an aero-engine impact load deformation self-adaptive rotor-supporting structure, and belongs to the technical field of aero-engine bearing structure design. Comprising a rotor journal, a bearing, a bearing seat, a turn-back bushing, metal rubber and a sleeve. The rotor journal is used for transmitting rotor load, the bearing outer ring is installed on the bearing seat, the section of the turn-back lining is in a U shape, one end of the inner layer of the turn-back lining abuts against a shaft shoulder of the rotor journal, the other end of the turn-back lining presses and fixes the bearing inner ring through the nut and the sleeve, and the metal rubber is arranged in an interlayer of the turn-back lining. The turn-back bushing can reduce the rotor-bearing angular rigidity, allows larger angular misalignment, and reduces the load transmitted to the bearing and a force bearing system; the metal rubber can dissipate impact energy when the turn-back lining deforms. The turn-back lining and different inner rings can be combined in various modes, for example, the turn-back lining and the first inner ring can be manufactured into a whole, and when the turn-back lining is matched with the second inner ring or the third inner ring, a flexible lining can be matched to further reduce rigidity. By means of the structure, the safety and reliability of the aero-engine under the impact load are effectively improved.

The invention relates to the technical field of steel bar machining and shearing equipment, and discloses a lifting roller bed before cold shearing, which comprises a bottom frame, a comb plate assembly and a plurality of groups of lifting roller bed assemblies, the comb plate assembly is installed on the upper end face of the bottom frame and comprises a plurality of comb tooth parts, and a first gap used for lifting of the lifting roller way assembly is formed between every two adjacent comb tooth parts. The lifting roller way assemblies are arranged on the bottom frame at intervals and correspond to the first gaps in a one-to-one mode, and each lifting rail assembly comprises a roller way, a bearing seat, a driving mechanism and a lifting mechanism. The two ends of the roller way 3 are arranged on the bottom frame in a liftable mode through bearing seats, the roller way protrudes out of the first gap so as to make contact with steel on the comb plate assembly, the driving mechanism is used for driving the roller way to rotate around the axis of the roller way, and the lifting mechanism is used for driving the bearing seats to ascend and descend so as to adjust the height of the roller way. The high-low position of the single-set roller way can be independently adjusted, the height of the roller way can be adjusted in time according to different steel incoming conditions, and it is guaranteed that steel smoothly runs on the roller way.

The invention provides a gas dynamic pressure bearing. The gas dynamic pressure bearing comprises a top foil, a fixed foil piece, a first supporting foil piece, a second supporting foil piece and a bearing sleeve, wherein the fixed foils are composed of fixed foil arc foils and fixed foil flat foils, the fixed foils distributed in the circumferential direction are fixed to the outer surface of the top foil through the flat foils, the first supporting foil and the second supporting foil are arranged in the space defined by the two adjacent fixed foil arc foils and the top foil, the second supporting foil is arranged in the first supporting foil, and the first supporting foil and the second supporting foil are arranged on the outer surface of the top foil. And the fixed foil and the first supporting foil jointly support the top foil, and the arc-shaped foil of the fixed foil is arranged in the arc-shaped groove of the bearing sleeve to limit the circumferential movement of all the foils. The arc-shaped foil of the fixed foil surrounds the supporting foil to jointly support the top foil, and the flat foil of the fixed foil is fixed on the outer surface of the top foil, so that the processing technology of the foil gas dynamic pressure bearing is simplified; meanwhile, the multi-layer structure can provide good rigidity and damping characteristics for the bearing.

A bearing bush for movably holding a generator-side component and a foundation-side component of a wind turbine may include an elastomer body having a cavity for receiving a foundation-side or generator-side bearing bolt defining a longitudinal direction, and a tensioning assembly adapted to compress the elastomer body on both sides in the longitudinal direction in such a way that it exerts a pretensioning force directed in the longitudinal direction on both sides of the elastomer body when compressing the elastomer body.

A bearing system may include a bearing. A bearing system may include an elastomer ring surrounding the bearing, the elastomer ring contacting the bearing with a ring inner surface, the elastomer ring maintaining a position of the bearing. A bearing system may include a biasing element positioned to apply a biasing force to the elastomer ring, the elastomer ring transferring at least a portion of the biasing force to a radial force on the bearing.

A squeeze film damper includes a first component configured to be rigidly coupled to a support structure of a rotating machinery; a second component extending between first and second axial ends, the first axial end facing the first component, the second component having an outer surface configured to be at least partially surrounded by a squeeze film annulus; a journal bearing coupled to the second component for pivoting a rotary shaft; a flexible spoke, wherein the flexible spoke has first and second ends, the first end being rigidly coupled to the first component; the second component including a clearance hole extending in axial direction of the second component starting from the first axial end of the second component, wherein the flexible spoke second end is rigidly coupled to the second component and the flexible spoke extends through the clearance hole.

The application provides a novel high-temperature-resistant small-hole tilting-pad bearing which is mainly composed of a bearing shell and a metal wire mesh structure, adopts a tilting-pad structure with S spring flexibility, is provided with micro grooves on each pad, and is provided with small holes on the micro grooves as working surfaces for supplying gas to form a gas film. The left and right two parts of the bearing shell are integrally machined by using electric spark technology and are connected and fixed by using cylindrical pins. Since the throttler, the flow channel and the shell are integrally machined, the bearing has the characteristics of high-temperature resistance. The metal wire mesh structure is embedded in the gap between the bearing body and the pad, the metal wire mesh structure provides flexible support for the pad, and can keep the performance stable at high and low temperatures. Therefore, the bearing structure provided by the application can provide higher damping characteristics for the bearing and has the characteristics of high-temperature resistance.

The universal coupling protection device comprises an intermediate shaft arranged in the middle and connecting fork heads installed at the two ends of the intermediate shaft through cross shafts, and further comprises a protection assembly, and the protection assembly is arranged in the middle of the intermediate shaft; the protection assembly comprises a bearing bush, a fastening bolt, a guide hole and a shaft hole, the bearing bush is installed in the middle of the middle shaft, a bearing bush seat is arranged at the bottom end of the bearing bush, first connecting blocks are arranged on the two sides of the bottom end of the bearing bush seat, supporting rods are installed on the first connecting blocks through first rotating shafts, and moving blocks are installed at the bottom ends of the supporting rods through second rotating shafts. The universal coupling is novel in structure, ingenious in conception and capable of supporting the intermediate shaft, keeping balance of the intermediate shaft and conducting buffering balance on the height and the inclination angle of the intermediate shaft, and can prevent the intermediate shaft from swinging easily along with rotation of the connecting fork head when a cross shaft of the running universal coupling is broken, so that the service life of the intermediate shaft is prolonged. And finally, the equipment is damaged and even operators are harmed.

The invention discloses a magnetic bearing falling protection device based on extrusion oil film damping. The magnetic bearing falling protection device comprises a damper base, a damper inner ring, a damper outer ring and a squirrel-cage elastic support. The damper outer ring is located at the top end of the damper base. The damper inner ring is mounted at an outer side port of the magnetic bearing outer ring in an interference fit manner through the squirrel-cage elastic support; the squirrel-cage elastic support is vertically mounted on the inner side of the damper base; an annular oil supply groove is formed in the inner wall of the damper outer ring, and an oil film is formed in the area defined by the outer wall of the damper inner ring, the inner wall of the damper outer ring and the groove wall of the annular oil supply groove. The damper inner ring has elastic damping, and stress is evenly distributed under the load effect so as to resist reverse vortex motion and forward vortex motion of the rotor in the rotating speed decreasing process. Through the damping effect of the oil film in the arch-shaped structure, vibration and noise of a bearing rotor system are reduced, and meanwhile the stability and accuracy of the rotor are improved.

The present invention provides a centrifugal separator (1) for separating at least one liquid phase from a liquid feed mixture. The separator is comprising a rotatable portion (10), a stationary portion (2) and a drive motor (4) arranged for rotating the rotatable portion (10) relative said stationary portion (2) around an axis of rotation (X). The rotatable portion (10) comprises a centrifuge bowl (10a) and a rotatable shaft (7) onto which said centrifuge bowl (10) is mounted. The centrifuge bowl (10a) comprises a separation space (9a), in which surface enlarging inserts (17) are arranged, an inlet (11) for supply of the liquid feed mixture, at least one liquid outlet (12, 13) for discharge of a separated liquid phase. At least one bearing (5, 6) is mounted to the rotatable portion (10) to facilitate its rotation, wherein said at least one bearing (5,6) is a grease-lubricated bearing.

A bearing system for a rotatable shaft includes a bearing shaft (18) coaxial with the rotatable shaft, a bearing coaxial with the bearing shaft (18), a bearing housing surrounding the bearing and having a plurality of retention channels disposed axially along the bearing housing, and a dampening assembly comprising a plurality of circumferential seal elements disposed within each of the plurality of retention channels. A first subset of the plurality of seal elements is formed from a first material and a second subset of the plurality of seal elements is formed from a second material.

The invention relates to the technical field of air bearings, in particular to an air flexible supporting tilting pad bearing with an interlayer type damping structure and a manufacturing method, the air flexible supporting tilting pad bearing comprises a bearing outer ring, and four tilting pads are connected to the inner side of the bearing outer ring through four sets of damping structures; the damping structure comprises a swing spring, and an interlayer type damping layer is arranged in the swing spring. An air inlet hole communicated with an external air supply channel is formed in the end face of the tilting pad, a pressure equalizing groove is formed in the inner side face of the tilting pad, and a capillary throttling hole communicated with the air inlet hole is formed in the pressure equalizing groove; the high-strength and high-toughness alloy steel and the nitrile rubber with good elasticity and oil resistance are effectively combined, so that the bearing capacity and the overall stability of the bearing structure are enhanced, and meanwhile, the vibration reduction and buffering characteristics of the bearing structure are remarkably improved; the multi-material collaborative design is beneficial to improving the operation reliability and prolonging the service life of a bearing system, and the comprehensive performance requirement for a high-performance vibration reduction supporting component under the complex working condition is met.

The invention provides a main bearing of a CT machine, and belongs to the technical field of bearing manufacturing. The CT machine main bearing comprises an inner ring, an outer ring and two rows of balls provided with retainers, one of the inner ring and the outer ring is provided with a raceway in contact with the two rows of balls, the other of the inner ring and the outer ring comprises a first split ring and a second split ring, the first split ring is provided with a boss used for temporarily supporting the first row of balls when the first row of balls are installed, and the second split ring is provided with a boss used for temporarily supporting the second row of balls when the second row of balls are installed. Gaskets are fixed on the two split rings through ferrules respectively, the two ferrules are integrated annular rings and are provided with raceways in contact with the balls, and the two split rings are provided with inner diameters or outer diameters matched with the corresponding ferrules so that the corresponding ferrules can be directly installed on the split rings in the axial direction. A supporting ring used for temporarily supporting the second row of balls when the second row of balls are installed is arranged between the two split rings in a clamped mode. Compared with an existing steel wire with a notch, the integrated annular ring is higher in structural strength, the problem of abnormal sound of the bearing is completely eradicated, and meanwhile it is guaranteed that the bearing can be smoothly assembled through the supporting ring.

The invention relates to the technical field of spherical elastic bearings, in particular to a multi-layer rubber bearing for a vehicle body hinging device and an application and design method of the multi-layer rubber bearing. The multi-layer rubber bearing for the vehicle body hinge device comprises an upper connector, a plurality of spacers and a lower connector which are sequentially arranged and a rubber layer integrally formed among the upper connector, the spacers and the lower connector, the upper connector comprises a convex spherical surface end, the lower connector comprises a concave spherical surface end, the spacers are hemispherical spacers, and the rubber layer is arranged between the upper connector and the lower connector. The convex spherical surface end of the upper connector, the concave spherical surface end of the lower connector and all the spacers share the same sphere center, and the convex spherical surface end of the upper connector extends into the concave spherical surface end of the lower connector. The application method of the multi-layer rubber bearing for the vehicle body hinging device comprises the step that the far ends of the upper fixed hinge and the lower fixed hinge are connected with adjacent vehicle bodies respectively. The design method of the multi-layer rubber bearing for the vehicle body hinge device comprises the step of adjusting the product performance by changing the characters of the rubber layers and the spacers.

The invention belongs to the technical field of rotary mechanical system supporting damping, and particularly relates to a throttling ring type elastic supporting structure suitable for an aero-engine rotor system, the throttling ring type elastic supporting structure mainly comprises a bearing, an inner throttling ring, an elastic ring, an outer throttling ring and a bearing seat, and a plurality of staggered bosses are uniformly distributed on the inner surface and the outer surface of the elastic ring and matched with the two throttling rings; and a plurality of oil film cavities which are not directly communicated are formed. After entering the oil cavity through the oil supply channel of the bearing seat, lubricating oil circumferentially flows through the throttling grooves of the inner throttling ring and the outer throttling ring to generate required damping force, so that the vibration amplitude of the rotor when the rotor crosses the critical rotating speed is effectively reduced. Meanwhile, the elastic ring does not need to be provided with a small hole, so that the stress concentration risk is greatly reduced, and the fatigue life and the reliability are remarkably improved. According to the structure, the shape and the size of the throttling groove can be flexibly adjusted to meet different damping requirements, the manufacturing cost is low, and the structure is easy to popularize and apply in high-speed rotating machines such as aero-engines and gas turbines.

The invention relates to a bearing (21) for a turbine engine comprising an oil film compression damper, including an inner sleeve (22) intended to receive an outer ring of a rolling bearing, an outer sleeve (23) surrounding the inner sleeve (22) and delimiting, with this inner sleeve (22), an axisymmetric cavity (27) supplied hydraulically in order to form a film of damping oil, this cavity (27) being closed at its ends by two segments (24, 26). According to the invention, the cavity (27) comprises a first portion (31) and a second portion (32) separated from one another by a movable segment (29) able to occupy a closed position in which it forms a controlled sealing barrier between the two portions (31, 32), and an open position in which the two portions (31, 32) communicate with one another, and it is the first portion (31) that is supplied hydraulically to form the film of oil.

The present invention provides a main bearing for a CT machine, belonging to the technical field of bearing manufacturing. The main bearing for a CT machine includes an inner ring, an outer ring, and two rows of balls each equipped with a cage. One of the inner ring and the outer ring is provided with a raceway in contact with the two rows of balls, and the other includes a first split ring and a second split ring. The first split ring is provided with a boss for temporarily supporting the first row of balls when installing the first row of balls. Gaskets are respectively fixed on the two split rings through retaining rings. Both retaining rings are integral annular rings and are provided with raceways in contact with the balls. Both split rings have an inner diameter or an outer diameter adapted to the corresponding retaining ring for the corresponding retaining ring to be directly installed on the split ring along the axial direction. A support ring for temporarily supporting the second row of balls when installing the second row of balls is clamped between the two split rings. Compared with the existing steel wire with a notch, the integral annular ring has higher structural strength, eliminating the problem of abnormal noise of the bearing. At the same time, the use of the support ring ensures the smooth assembly of the bearing.

The invention provides a high-stability bearing seat based on elastic buffering, the axis of the high-stability bearing seat is in the vertical direction after installation, the high-stability bearing seat comprises a seat body, an annular cavity is formed in the seat body, a plurality of fan-shaped damping units which are evenly arranged in the circumferential direction are arranged in the annular cavity, and the fan-shaped damping units are filled with magnetorheological fluid. Each fan-shaped damping unit comprises an outer cavity and an inner cavity which are sequentially arranged from outside to inside in the radial direction, the outer cavities and the inner cavities are connected through radial straight-through flow channels, a plurality of honeycomb hole plates are arranged in the inner cavities, and honeycomb holes of the honeycomb hole plates are staggered in the radial direction so that labyrinth flow channels can be formed in the inner cavities. A connecting pipe is arranged between every two adjacent fan-shaped damping units so that a circumferential straight-through flow channel can be formed between the fan-shaped damping units, the inner side wall and the outer side wall of each fan-shaped damping unit have the micro-deformation capacity, the preset pre-deformation amount of the outer side wall is larger than that of the inner side wall, and the yield strength of the inner side wall is larger than that of the outer side wall.

An aircraft engine, comprising: a shaft; a bearing housing extending around the shaft and defining a bearing cavity; a bearing in the bearing cavity and rotatably supporting the shaft; a squeeze film damper including: a first seal proximate a first end of the bearing, and a second seal proximate a second end of the bearing; an annulus between the first seal and the second seal, the annulus having a damping fluid in the annulus; and wherein at least the first seal includes a sealing ring received within a groove extending axially from an outer groove wall to an inner groove wall, the inner groove wall located axially between the outer groove wall and the annulus, the sealing ring having an outer ring face facing the outer groove wall and an inner ring face facing the inner groove wall, the inner ring face being movable relative to the outer ring face.

The invention relates to the technical field of bearing covers, and discloses a micro-motion bearing sleeve structure which comprises an inner sleeve and an outer sleeve, and the top ends of the inner sleeve and the outer sleeve are connected into an integrated structure through a transition connecting part, so that the inner sleeve can perform micro-motion relative to the outer sleeve; the inner side of the inner sleeve is fixedly connected with a bearing outer ring, and the outer sleeve is connected with an external machine body to limit the position of the bearing sleeve; the inner sleeve and the outer sleeve are arranged into an integrated structure, and the top ends of the inner sleeve and the outer sleeve are connected through the transition connecting part and the sealing part, so that a space for the inner sleeve to slightly move is formed between the outer side of the inner sleeve and the inner side of the outer sleeve, and the inner sleeve can slightly move relative to the outer sleeve; due to the fact that the material of the bearing sleeve has certain elasticity, the bearing can slightly move on the inner side of the outer sleeve together with the inner sleeve through the inner sleeve, the steering wheel shaft sleeve cannot be abraded for a long time due to vibration of a vehicle in the vehicle running process, and the integrated bearing sleeve structure does not have the risk of splitting.

The utility model belongs to the technical field of CT machine main bearing damping, and particularly relates to a high-speed CT machine main bearing damping device which comprises a limiting block. Connecting blocks are fixedly connected between the multiple limiting blocks. Inner rings of double-row angle bearings are fixedly connected to the side walls of the multiple connecting blocks. A connecting rod is slidably connected into the limiting block. The ends of the two connecting rods are fixedly connected with fixing blocks, and the other ends of the two connecting rods are fixedly connected with centrifugal blocks. A fixed convex block is fixedly connected to the side wall of the centrifugal block; clamping wheels are fixedly connected between the corresponding fixing protruding blocks, and the multiple clamping wheels are arranged corresponding to the size of the double-row angle bearing. According to the utility model, the plurality of clamping wheels are arranged to extrude the inner ring of the double-row angle bearing which rotates at a high speed, so that the inner ring and the outer ring of the double-row angle bearing are tightly attached, the vibration condition caused by a raceway structure error and a ball size error is further reduced, the negative influence of bearing vibration on CT imaging is favorably relieved, and the imaging quality of a CT machine is improved.

The invention relates to a device (30) for centring and guiding the rotation of a turbine engine shaft, the device comprising a rolling bearing (32), a bearing support (34) and an annular damping cavity (52) formed between an inner annular surface (50) of the bearing support (34) and an outer annular surface (48) of an outer ring (38) of the bearing. A discharge duct (70) formed in the outer ring (38) connects a fluid inlet (72) that opens into the annular damping cavity (52) to a fluid outlet (74) that opens through an inner annular surface (44) of the outer ring (38) and is inclined towards an annular row of rolling elements (40) of the bearing in order to lubricate these elements using liquid lubricant discharged from the annular damping cavity (52). A location at which a supply duct (60) opens through the inner annular surface (50) of the bearing support (34) is axially offset relative to the fluid inlet (72).

The present invention relates to a press-fit ring (1) for supporting an inner element (10) in an outer element (11), an electric machine (12), and a muscle-powered vehicle (12). The press-fit ring (1), for supporting an inner element (10) in an outer element (11), comprises a radially inner cover layer (2a), a radially outer cover layer (2b), and a first viscoelastic intermediate layer (3a), wherein, in the radial direction (4), the first viscoelastic intermediate layer (3a) is arranged between the radially inner cover layer (2a) and the radially outer cover layer (2b), and wherein the radially inner cover layer (2a), the radially outer cover layer (2b), and the first viscoelastic intermediate layer (3a) are arranged concentrically.

The invention provides an anti-impact bearing structure and a brushless motor, and relates to the technical field of brushless motors. The shock-resistant bearing structure comprises a rotating shaft body, a bearing, a base, a bearing cover, a shaft end cover and a buffer assembly, the shaft end cover is arranged on the outer side of the rotating shaft body in a sleeving mode, the shaft end cover and the rotating shaft body are each provided with a corresponding threaded section, and the shaft end cover is in threaded connection with the rotating shaft body through the threaded sections; the bearings are arranged on the outer sides of the shaft end covers in a sleeving mode, the bases are arranged on the outer sides of the bearings in a sleeving mode, the multiple bearings are arranged at intervals in the axial direction of the rotating shaft body, and the buffering assemblies are arranged between the adjacent bearings; the bearing cover is connected with the base, in the axial direction of the rotating shaft body, the bearing cover and the base clamp outer rings of the multiple bearings, and the rotating shaft body and the shaft end cover clamp inner rings of the multiple bearings. The impact resistance of the brushless motor is further improved on the premise that the structure of the brushless motor is kept compact and the cost is controlled.

The application relates to the technical field of air bearings, in particular to an air bearing based on a bottom plate embossed boss. The air bearing comprises a bottom plate, a plurality of supporting wave foils and a top foil, the bottom plate is provided with bosses protruding towards the supporting wave foils at positions corresponding to the supporting wave foils, the bosses are integrally embossed and formed with the bottom plate, and the bosses are fixedly connected with the top foil; one side of the supporting wave foil is provided with a clamping hole matched with the shape of the boss, the supporting wave foil is fixedly connected with the boss through the clamping hole, and the pre-tightening assembly is arranged between the positioning clamping boss and the positioning clamping groove. The spot welding process between the supporting wave foil and the bottom plate is cancelled, the unstable size tolerance caused by multiple weldings is avoided, the qualified rate of the product is greatly improved, the processing cost is reduced, the problem that warping deformation caused by too many spot weldings affects the flatness is avoided, the qualified rate of the finished product is improved, the welding spots on the contact surface between the top foil and the thrust disc are reduced, and the flatness and smoothness of the top foil are improved.

A support mechanism (30) for rotatably supporting both axial ends of a screw shaft (21) is provided with: a bearing unit (41) provided with a moving-side bearing housing (51) and a pair of angular ball bearings (33B); a support table (43); and a housing position adjustment mechanism (44) disposed between the bearing unit (41) and the support base (43). The housing position adjustment mechanism (44) has: a support table-side member (61) provided on the support table (43) side; a bearing housing-side member (62) provided on the bearing housing (51) side and capable of moving relative to the support base-side member (61) in the axial direction; a working fluid housed in a pressure chamber (66) formed between the support table-side member (61) and the bearing housing-side member (62), a reservoir chamber (71) formed in either the support table-side member or the bearing housing-side member, and a damping hole (72) connecting the pressure chamber (66) and the reservoir chamber (71); a belleville spring (80) disposed in a compressed state within the pressure chamber (66) between opposing axial end surfaces of the support table-side member (61) and the bearing housing-side member (62); and a hollow member (90) housed in the storage chamber (71). Thus, even if the axial lengths of the screw shaft and the rotating shaft change due to the influence of heat, the axial support rigidity can be continuously and stably maintained.