124results about "Hydrostatic bearings" patented technology

A gyratory crusher includes a crushing head on which a first crushing shell is mounted, and a frame on which a second crushing shell is mounted. The crusher has a thrust bearing which is made up of horizontal bearing plates and which is located between a vertical shaft and a piston arranged vertically below the vertical shaft. The crusher further has a first space, which is adapted to receive a variable amount of pressurized liquid, the first space being defined by the piston and a piston housing formed in the frame, and a second space which is adapted to receive, by way of a duct, pressurized liquid from the first space, the second space being located between the vertical shaft and the piston and at least partly accommodated in an opening in at least one of the bearing plates. The first space and the second space are adapted, by the liquid, to transmit forces from the crushing head to the piston housing, in order that the load on the thrust bearing is relieved.

A bearing device of a gas turbine power generation equipment provides damping vibration of a shaft and lubricates and cools the bearing main body.

The bearing devices have sleeves provided on the outer circumference sides of the bearing main bodies and bearing housings holding the respective sleeves via O-rings while each forming an annular clearance passage between each of the outer circumferences of the sleeves and a corresponding one of the bearing housings. The bearing housing has a feed-water hole communicating with the clearance passage and adapted to feed water thereto. The sleeve has a lead water hole communicating with the clearance passage and is adapted to lead water to the bearing main body, and a discharge hole which communicates with the clearance passage and is adapted to discharge water therefrom.

A machine tool assembly includes a high speed rotating spindle for forming extremely precise surface contours on a work piece. The spindle is supported on a spherical air bearing about its center of gravity. The spindle can be rotated through an air turbine drive system incorporated into the spherical air bearing to eliminate any undesirable moments about an axis perpendicular to the long spindle axis. The spindle is adjustable in pitch and yaw directions through the influence of X-Y actuators. The X-Y actuation system is preferably electromagnetic and provides a non-contact method of displacing the spindle shaft in a controlled manner at any speed.

In order to effect a seal; a porous material which comprises one side of two opposing surfaces is used to restrict and evenly distribute externally pressurized gas, liquid, steam, etc. between the two surfaces, exerting a force which is opposite the forces from pressure differences or springs trying to close the two faces together and so may create a non contact seal that is more stable and reliable than hydrodynamic seals currently in use.

A method for ascertaining a correction value for monitoring a fluid bearing of a coordinate measuring machine or other machine tool. Also disclosed is a coordinate measuring machine having at least one fluid bearing. The machine further includes a first element and a second element which are supported against each other by means of at least one fluid bearing. In addition, a control device is provided for controlling the machine. A quantity representing a pressure in the at least one fluid bearing is ascertained as a function of a position and/or orientation of the first element relative to the second element. A correction value for a pressure in the at least one fluid bearing is determined for the position and/or orientation of the first element relative to the second element. The correction value is then stored in the control device, and subsequently used for machining or measuring a workpiece.

To reduce the amount of lubricating oil released (supplied) between the outer circumferential surface of a rotation shaft and the inner circumferential surfaces of pads, so as to reduce the churning loss, and to reduce the bearing loss. The journal bearing comprises: a plurality of pads arranged radially inside a lower half-carrier ring at intervals, for receiving load from the rotation shaft; and a plurality of pad stops respectively arranged at the circumferentially opposite ends of the respective pads, for restraining circumferential movements of the respective pads, wherein, among these pad stops, the pad stops other than the pad stop located in the most forward position in the axial rotation direction of the rotation shaft have functions as oiling nozzles for releasing lubricating oil between the outer circumferential surface of the rotation shaft and the inner circumferential surfaces of the pads.

A gas bearing spindle includes a rotation shaft, a sleeve, and a housing. The sleeve includes a bearing portion formed of a nonmetallic sintered body; and a retaining ring formed of a metal. Further, the retaining ring and the bearing portion are in contact with each other at a first fit surface that is a boundary surface between the outer circumferential surface of the bearing portion and the inner circumferential surface of the retaining ring, as well as at a second fit surface that is a boundary surface between the outer circumferential surface of the bearing portion and the inner circumferential surface of the retaining ring, is distant further away from the sleeve through hole relative to the first fit surface, and is formed adjacent to a center of the sleeve through hole in a direction in which the sleeve through hole extends, when viewed from the first fit surface.

A rotation shaft supporting structure with which the radial clearance between the bearing surface of an upper tilting pad on which self weight of the rotation shaft does not exert and rotating surface of the journal of the rotation shaft can be adjusted so that a high pressure oil film is formed in the clearance and carryover of lubrication oil from an upstream pad to its adjacent downstream pad is prevented.

A plurality of bearing pads (40) are disposed in a bearing housing (30) to surround coaxially a journal j of a rotation shaft, a spring (80) is disposed between the bearing housing (30) and an upper pad (40a, 40b) near downstream side end of the pad in relation to the rotation direction of the journal to push the end part of the pad radially inward, and an oil supply nozzle (50) is mounted to the bearing housing (30) to be located adjacent to the upstream and downstream side end of each pad (40), the upstream side nozzle is to supply lubrication oil to the bearing surface of the pad and the downstream side nozzle is to inject oil toward the journal surface to prevent carryover of lubrication oil from the bearing surface of the upstream pad to that of the downstream pad dragged by the rotating surface of the journal, the nozzles also serving as stoppers to prevent rotational movement of the pad (40).

The present invention relates to a new kind of foil bearing. The present invention relates to a bearing comprising a flexible foil with a self-aligning mechanism. The present invention furthermore relates to a foil bearing enabling a linear and/or rotary movement along/around an axis (i.e. a shaft). The present invention also relates to a foil gas/air bearing with a self-aligning mechanism. The present invention furthermore relates to the use of said foil bearing in machines, more specifically in precision and/or high-speed machines and in high-speed precision spindles.

A method for adjusting a fluid gap in fluid film bearings comprising the steps of applying a load to the bearing, measuring fluid pressure of the fluid film, determining the fluid gap using a known relationship between the bearing load applied versus gap and corresponding fluid pressure and adjusting the gap to a desired width using the known relationship between the bearing load applied versus gap and corresponding fluid pressure. Predetermined measurements of film gage pressure, supply gage pressure and gap distance can be used to determine the ratio of absolute film pressure to absolute input pressure which, in turn, can be used to determine a formula for calculating unknown gap distances.

The invention provides a gas film pressure vector control device for an aerostatic bearing. The control device comprises a main shaft and a bearing, wherein the bearing is arranged outside the main shaft, an air film is formed in a gap area between the main shaft and the bearing, and throttling holes are uniformly distributed in the bearing; an air chamber coat sleeves outside the bearing, a closed area formed between the air chamber coat and the bearing is the air chamber, and the throttling holes communicate the air film and the air chamber; a flow control valve is arranged on the wall surface of the air chamber coat opposite to the throttling holes in a penetrating mode, the flow control valve is coaxially arranged with the throttling holes, and the valve element of the flow control valve is used for adjusting the opening degree of the throttling holes; an air inlet hole penetrates through the wall surface of the air chamber coat and is externally connected with an air inlet pipe; awireless pressure sensor is arranged in a groove formed in the inner wall of the bearing, the shape, close to one side of the main shaft, of the wireless pressure sensor is consistent with the shapeof the inner wall surface of the bearing, and namely the wireless pressure sensor and the gas film flow field do not interfere with each other; the flow control valve is connected with a wire collecting terminal through a wire harness; the control device is connected with the wire collecting terminal through an anti-interference bus; and the vector control of the gas film pressure of the aerostatic bearing can be realized.

The invention discloses a split type static pressure gas bearing device with an adjustable swing angle and for rotor static balance, and belongs to the field of rotor static balance detection. The split type static pressure gas bearing device with the adjustable swing angle and for rotor static balance is used for solving the problems that an existing rotor static balance device uses a rolling bearing as a support, due to the fact that the frictional resistance is high, rolling balls can be worn after the rolling bearing is used for a long time, the rotor measurement accuracy is reduced, and most of existing static pressure gas bearings are integrally manufactured and cannot be applied to the existing rotor static balance device. The split type static pressure gas bearing device with the adjustable swing angle and for rotor static balance comprises a bearing pedestal, an upper supporting base, a lower supporting base, a base and a gas inlet channel. A first semi-cylindrical face whichis inwards concave is processed on the bearing pedestal, and multiple gas holes are formed in the first semi-cylindrical face. The bearing pedestal is fixed to the upper supporting base, a sealed gascavity is formed between the bearing pedestal and the upper supporting base, the multiple gas holes communicate with the sealed gas cavity, and the sealed gas cavity is connected with an external gassupply device through the gas inlet channel. The upper supporting base and the lower supporting base are hinged so that the axis of the semi-cylindrical face can swing by a certain angle in the vertical direction. The lower supporting base and the base are connected together. The split type static pressure gas bearing device with the adjustable swing angle and for rotor static balance is suitablefor rotor static balance detection.

The invention discloses an air flotation main shaft bearing compensation device and method. Bearing compensation is conducted on rotation errors of existing air flotation bearings through weights or springs, and real-time detection and bearing compensation cannot be achieved. When an air flotation main shaft generates rotation errors, a control valve adjusts the output gas pressure under the control of a controller, bearing compensation is conducted on the side, with a thin air film, of the air flotation main shaft, and adjustment of the controller is not stopped until displacement sensors ofthree air flotation support assemblies detect that the radial clearances between the air flotation support inner ends of the three air flotation support assemblies and the air flotation main shaft arethe same. The air flotation main shaft returns to the air floatation support centering position of the three air flotation support assemblies, and air flotation main shaft bearing compensation is achieved. By means of the air flotation main shaft bearing compensation device and method, real-time compensation of bearing force is achieved, and a pressure sensor displays air flotation support bearing force; and the radial clearances between the air flotation support inner ends and the air flotation main shaft are adjustable, and therefore the device can better adapt to different rotating speedsand machining of different parts.

The invention discloses a static pressure type radial gas bearing structure. The static pressure type radial gas bearing structure mainly consists of components such as a fixing bearing seat, metal rubber, bearing bushes and bearing bush baffles, wherein the fixing bearing seat adopts a circular ring design, and achieves a fixing effect on the bearing bushes and the metal rubber; and an annular high-pressure gas cavity is formed inside the fixing bearing seat, anti-rotation grooves extend on the inner surface in the axial direction, and the bearing bush baffles are fixedly arranged at the endsurfaces of the two ends. Each bearing bush is processed and manufactured by carbon-graphite alloy materials, anti-rotation grooves are formed in the outer surface in the axial direction, and annulargrooves are designed at the end surfaces of the two ends of the bearing bush and are used for installing a meal sealing ring. The meal sealing ring is arranged between the bearing seat and the bearingbushes, and is provided with position limiting bulges corresponding to the anti-rotation grooves of the fixing bearing seat and the bearing bushes. The bearing bush baffles are arranged at the fixingbearing seat, form a sealing surface by cooperating with the end surfaces of the two ends of the bearing bushes, and are used for sealing of high-pressure gas supply of a bearing.

The invention provides an elastic foil sheet gas bearing and an elastic foil sheet gas bearing friction pair. The elastic foil sheet gas bearing comprises a bearing block, arch foil and a porous lining sleeved with the part between the bearing block and the arch foil. The bearing block is provided with a plurality of gas supply holes evenly arranged in the circumferential direction, and the gas supply pressure of the gas supply holes can be adjusted. The porous lining is provided with a plurality of pressure equalizing holes communicating with the gas supply holes and the arch foil. High-pressure gas in the gas supply holes directly acts on the arch foil through the pressure equalizing holes. During work, high-pressure gas inflation is conducted from the gas supply holes of the bearing block, the high-pressure gas directly acts on the arch foil through the pressure equalizing holes of the porous lining, and additional rigidity and damping are provided for the arch foil. Meanwhile, thevibration situation of a rotor system is analyzed according to the feedback result of the gas supply pressure of the gas supply holes, the gas supply pressure of various gas supply holes is adaptivelyadjusted, accordingly accurate regulation and control over the arch foil rigidity and damping can be achieved, the flexibility of the arch foil is good under the light load condition, the arch foil is not crushed under the heavy load condition, and stability of the rotor system is guaranteed.

The invention discloses a static pressure air floatation thrust bearing based on multi-ring exhaust, and belongs to the technical field of gas bearings and gas lubrication. According to the static pressure air floatation thrust bearing, through a combined type flow control structure of small hole throttling at an air film inlet and porous throttling at an exhaust inlet, the effect of homogenizing pressure is achieved while it is guaranteed that the air flow is not lost, and the rigidity of the bearing is improved; small hole throttling is adopted in a throttler in the thrust bearing, diffusion flow of the throttler is guided in three different modes, namely first-stage pressure equalizing, second-stage pressure equalizing and porous ring pressure control, and the adjustable composite diffusion flow can improve the bearing capacity and rigidity of the bearing; according to the multi-ring exhaust structure in the thrust bearing, a gas film far away from a natural pressure boundary has a stable and adjustable pressure boundary, so that the static pressure gas thrust bearing has better self-adaptability and can adapt to various gas supply conditions and variable loads, the bearing, rigidity and stability of the static pressure gas bearing are considered, and the purpose that one shaft has multiple purposes is achieved.