119 results about "Aerostatic bearing" patented technology

The invention provides an ultraprecise aerostatic electric spindle system which relates to an electric spindle system. The invention solves the problems that in the spindle system of current ultraprecise processing devices, rotation accuracy is poor; direct drive can not be realized and transmission effects of the power of an electric motor and a spindle are unfavorable. A motor shaft (14) on a DC brushless drive motor (15) is fixedly connected with the upper end face of an upper thrust plate (3); the spindle (4) and a spindle sleeve (5) are positioned between the upper thrust plate (3) and a lower thrust plate (6); the spindle sleeve (5) is sleeved on the spindle (4); the lower end face of the upper thrust plate (3) is fixedly connected with the upper end face of the spindle (4); the lower end face of the spindle (4) is fixedly connected with the upper end face of the lower thrust plate (6). The motor shaft (14) and the spindle (4) are coaxial; the spindle sleeve (5) is opened with a plurality of radial restriction orifices (8-1) and a plurality of axial restriction orifices (8-2). In the invention, an aerostatic bearing is used as an axial support and a radial support, which guarantees the rotation accuracy of the spindle; the aerostatic bearing has the effect for homogenizing the geometric accuracy of the spindle and the spindle sleeve so that shafting has extremely high rotation accuracy.

The invention relates to control moment gyro using moment testing gas floating rotate table that includes air hydrostatic bearing, main shaft encoder, workbench and torquer. The main shaft encoder is used to testing the angle location; the workbench is used to install testing object and the torguer is installed on the bottom of the air hydrostatic bearing to drive main shafting. The pressure of air hydrostatic bearing would be adjusted by pressure adjustor. The invention has the advantages of low attrition disturbance, easy to operate, convenience and high accuracy.

An automatically programmable tilting mechanism for holding a scribe tool at varying angles using an aerostatic bearing. The air bearing secures the scribe tool about its longitudinal shank and generally allows for free axial movement while the tool holding structure prevents rotation of the scribe tool, thus providing extremely fine compliance and force application of the scribe tool point against the substrate. During a scribing process, the tilting mechanism regularly adjusts the angle of the scribe tool relative to the substrate so that a fresh cutting edge is always being employed in the scribing process.

A planar positioning system having a rigid base, and first and second linear actuator means mounted to the rigid base, the first and second linear actuator means being arranged orthogonal to one another. A rigid reference surface (2A, 2B) is mounted to the base, (1) and a moveable platform (17) for holding a workpiece is supported for movement on the rigid reference surface (2A, 2B). First and second guiding means are coupled to moveable portions of the respective first and second actuator means, the first and second guiding means being arranged to bear on the moveable platform for transmission of forces thereto from the respective first and second actuator means to effect movement of the platform (17) on said rigid reference surface (2A, 2B). The first actuator means may comprise two linear actuators (4A, 4B) parallel to one another and spaced apart with the second linear actuator means (8) orthogonal thereto and arranged in an H-shaped configuration. The first and second guiding means and/or the components of the moveable platform (17) against which they bear are preferably constructed for low frictional movement in the direction orthogonal to the transmission of forces therefrom, such as by the use of non-contact aerostatic bearings (16A, 16B, 16C) or the like. Similarly, low friction bearings are utilised between the moveable platform (17) and the reference surface (2A, 2B).

A device having a directly driven rotating body (1), its circumference (11) being radially seated on radial bearings (4, 4′) in relation to the stationary body (2), and its at least one first face side (10) being axially seated in relation to the stationary body (2), wherein aerostatic bearings (5, 5′, 5″) are provided for the axial support mounting, characterized in that the first face side (10) has an annular magnet arrangement (32), which is configured coaxially to the axis of rotation (X) of the rotating body (1), and that the stationary body (2) has at least one electric coil arrangement (30), which is located opposite the annular magnet arrangement (32) in the axial direction and which forms together with the annular magnet arrangement (32) the components of an electrical direct drive (3) for the rotating body (1).

The invention belongs to the technical field of precision machining and measurement, which relates to a technology of a pneumatic bearing. The aerostatic bearing comprises a main shaft, a bearing sleeve and an external exhaust manifold. A closed zero-pressure trough loop is equipped in the bearing sleeve to collect all exhaust gas, the zero-pressure trough loop on both ends of the bearing sleeve further is located in the high-pressure region between two components and separated from the external environment; the zero-pressure trough loop is connected with the external exhaust manifold through an exhaust manifold or an air vent directly, and all exhaust gas is inducted out and recycled by the external exhaust manifold. The invention firstly proposes that a closed zero-pressure trough loop is arranged in the aerostatic bearing to lead the exhaust gas and separate the exhaust gas from the measurement environment. Therefore, the influence of the measurement environment caused by the gas turbulence due to the discharge of the exhaust gas is eliminated, the measurement precision of the measuring system is remarkably improved, the structure of the aerostatic bearing is optimized, and dust is effectively from entering the bearing from the air vent, thereby the exhaust gas recycling aerostatic bearing can be widely applied to the precision machining and measurement devices.

The invention discloses a radial contained squeeze-film aerostatic bearing, which comprises a rotating shaft, piezoelectric patches, an inner sleeve, fastening screws and an outer sleeve, wherein the rotating shaft is arranged in the inner sleeve, a piezoelectric transducer is composed of the inner sleeve and the piezoelectric patches, the piezoelectric transducer is composed of three groups of piezoelectric patches which are uniformly distributed on the outer circumference of the inner sleeve, wherein the interval of each group of piezoelectric patches is 120 degree, the outer sleeve is sleeved outside the inner sleeve, the inner sleeve is fastened on the outer sleeve by screws. Each group of piezoelectric patch is composed of at least one sheet, which is pasted along the axial directionor radial direction of the inner sleeve. The present invention has the characteristics of uniform radial force of the rotating shaft, and has the advantages of non-contact, low wear, high precision, simple structure, no required affiliated gas source equipment and the like, and is capable of raising the bearing capacity and the rotation precision of the bearing. The present invention can be widely applied to equipments such as precision machine, instruments and meters, pneumatic suspension positioning equipments and the like.

A spindle apparatus includes a rotatable first spindle (5, 32) to which a tool can be attached. The first spindle is supported in a base with high precision using an air hydrostatic bearing. The spindle apparatus further includes a second spindle (6, 33) capable of rotation about an axis substantially aligned with the axis of the first spindle, first connection means for electrically connecting a base side and the second spindle, and second connection means for electrically connecting the first spindle and the second spindle. Electrical connection between the base side and the first spindle is carried out via the first and second connection means. The first connection means is, for example, a brush (15, 36). The second connection means has a degree of mechanical freedom and is, for example, a flexible electrical wire (17, 39) or a helical spring (51).

The invention discloses a bionic air spring system which comprises a passive vibration reduction component, a variable-rigidity variable-damping component, an anti-torsion vibration component, an aperture regulating mechanism and a bearing platform. The passive vibration reduction component is mounted on an environmental foundation; the variable-rigidity variable-damping component is arranged on the upper portion of the passive vibration reduction component; the anti-torsion vibration component is disposed on the periphery of the variable-rigidity variable-damping component; the lower end of the anti-torsion vibration component is fixed into the passive vibration reduction component, the bearing platform is sleeved at the upper end of the anti-torsion vibration component, and the upper end of the variable-rigidity variable-damping component is in contact with the lower surface of the bearing platform. By regulating a lead-screw transmission mechanism, aperture openness of damping holes is regulated, flow rate and velocity of fluid between a main air chamber and an auxiliary chamber are changed, and the rigidity value and the damping value of the air spring system are quantitative and adjustable. Meanwhile, three aerostatic bearings are uniformly distributed along the axis of the bionic air spring system to form the anti-torsion vibration component to simulate the three-point support attitude of both claws and the tail of a woodpecker, so that engineering adaptability and vibration reduction efficiency of bionic air springs are improved.

The invention provides a non-touch intraocular pressure measuring method and a device thereof, relating to the ophthalmology field of intraocular pressure measurement. The air-float intraocular pressure measurement module is placed inside the shell, the measurement module is designed according to the theory of the aerostatic bearing in the aerodynamic lubrication technology, the pressure sensor is installed in the back wall of the shell, and the shell is fixed on the micromatic setting. The air-float intraocular pressure measurement module reaches the rated measuring distance by adopting the micromatic setting. When the air-float measurement module of the intraocular pressure is on the force balance stage, the rated area of the cornea pressure sprayed from the foreside of the spray nozzle of the air-float intraocular pressure measurement module is balanced with the applied force which is produced by the pressure sprayed from the back spray nozzle of the air-float intraocular pressure measurement module; the processor is controlled by the microprocessor, the applied force is measured by the information processing device and then the intraocular pressure value is displayed. The intraocular pressure value can be directly measured by the invention, at the same time, the whole structure design is simple, the cost of the production is low, and the invention is portable and can be utilized in various intraocular pressure measurements.

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.

This invention refers to a process for manufacturing a porous component (1) to be used as flow restrictor, whose basic foundations include the metal injection molding process, which has been enhanced in order to obtain a component with open porosity homogeneously distributed. Such flow restrictor comprises at least one porous component (1), having at least one restricting portion with some porosity dimensioned to regulate the flow of gas that flows to an aerostatic bearing of a mechanical system, such as a hermetic compressor comprised by a piston at motion in relation to a cylinder, for instance. This invention also refers to the use and production of a porous component (1) obtained by powder injection molding or powder injection molding of multi-material parts, the porous component being (1) a flow restrictor with a layer of dense material; that is, with no open pores, on the outer surface parallel to the flow direction in which the flow through the porous component (1) shall occur, allowing it to be inserted into the bearing system without interfering with the porous structure of the core (dual porosity). The invention also refers to the sealing existing between the porous component (1) and its housing.

An aerostatic bearing spindle comprising a shaft (2) journalled within an aerostatic bearing (204), the bearing comprising at least one supply port (241) for supplying gas to generate a journal gas film between the shaft and the bearing, wherein the spindle is arranged in such a way as to cause, in use, an unequal pressure profile around the bearing for causing a damping effect to control orbiting of the shaft (2) within the bearing (204) An aerostatic bearing spindle arrangement comprising an aerostatic bearing spindle and an active control system (1001) for controlling at least one of the supply of gas to the journal gas film and exit of gas from the journal gas film to controllably alter the pressure profile around the bearing (104) in use.

A high-speed permanent magnetic motor assembly generates a magnetic field to produce mechanical output power. The assembly comprises a motor, a motor housing, and a radial bearing block. A motor housing supports a rotor and the radial bearing block with a left radial aerostatic bearing, a right aerostatic bearing, and an axial thrust aerostatic bearing. The bearings are porous aerostatic bearings that use a low-viscous vapor-liquid two-phase fluid as a lubricant, which penetrates through a porous bushing. The liquid vaporizes from pressure reduction, and part of the liquid arrives at a clearance between each of the bearings and the rotor. The liquid of the two-phase fluid is vaporized during discharge along an axial direction from the bearing. This increases the vapor in the clearance, improve a bearing capacity, retain position accuracy of an aerostatic bearing, and cool the aerostatic bearings and the rotor.

A modal analysis method of a static pressure main spindle under a micro scale includes: selecting and researching a flow factor in a rarefaction effect which can embody characteristics of air in a bearing at the micro scale; establishing an equation of pressure distribution of the aerostatic bearing, wherein the equation considers the case of the flow factor in the rarefaction effect at the micro scale; solving the equation to obtain the pressure distribution of the bearing, and then obtaining a rigidity and damping value of the bearing; taking the rigidity and damping value of the bearing calculated at the micro scale as a rigidity and damping value of a spring element, and thus embodying an effect of the bearing on a main spindle; establishing a main spindle model by a finite element analysis software ANSYS; and determining material properties and boundary conditions, and solving the model and obtaining a mode of the main spindle. According to the invention, the influences of the rarefaction effect are considered, the accuracy of the calculation is improved, so that the invention has certain theoretical guidance meaning in the research of dynamic performance of the main spindle.