Abstract: A device is proposed for centering a bearing bushing on a shaft wherein the bushing is made of a material, such as a ceramic, that is sensitive to tensile stress. At lower operating temperatures the bushing exhibits a degree of play relative to the shaft, but is play-free relative thereto at high operational temperatures. Correct centering of the bushing is ensured even in the higher temperature range by the provision of a pair of centering rings which are connected to the shaft without play and act on the bushing to center it. The centering rings are made of a material which, in comparison to the bushing, is not sensitive to tensile stress. It is expedient to provide the two centering rings at the end faces of the bushing. The clamping action of the centering rings on the bushing assures rotational pull of the bushing at low operating temperatures.

Abstract: A self-acting gas- dynamic or hydrodynamic bearing support for units rotating with a speed of about 10,000 rpm or higher consists of a stationary shaft (16) and a rotating bearing member (20) put on shaft with a radial gap of about 1 to 2 .mu.m. A distinguishing feature of the bearing support of the invention consists in that bearing member (20) is made of a wear-resistant ceramic and the thrust members (12 and 14) and the shaft (16) are made of steel with wear-resistant coating. The difference in coefficients of linear thermal expansion of steel and ceramic is advantageously used in assembling for self-positioning of the thrust members strictly perpendicular to the shaft and strictly parallel to each other and to the end surfaces of the bearing member. The invention also concerns a method of assembling of the bearing support.

Abstract: A one piece, molded plastic roller clutch cage has the heavy, rigid cross bars of adjacent pockets joined together by circumferentially flexible connecting members. The connecting members are located entirely within the space between pockets, and have no effect of the shape or structure of either the side rails or the cross bars of the pockets. When the cage expands or contracts with rising or falling temperatures, the curved connecting members can open or close, allowing the adjacent cross bars of adjacent pockets to move together or apart, thereby avoiding excess compression or tension in the cage.

Abstract: A fluid dynamic bearing is described having an inner element made of a first material with a first coefficient of thermal expansion, an outer element made of a second material with a second coefficient, and a layer of viscous fluid in contact with and separating the inner element from the outer element such that said outer element is capable of rotation around said inner element. By choosing particular materials, the difference between the first and second coefficients of thermal expansion can be controlled, and the thickness of the layer of viscous fluid can be made to vary with temperature. This allows for some degree of control over the temperature dependence of the stiffness and drag of the fluid dynamic bearing. In particular, the coefficients of thermal expansion can be chosen so as to cancel out any temperature dependence of stiffness and/or drag due to a temperature dependence of the viscosity of the viscous fluid.

Abstract: A generating head assembly for cutting or machining a surface on a workpiece and including a generating head mounted for relative rotation with the workpiece and with cutting or machining members having a radially advanced cutting or machining position for cutting or machining the surface of the workpiece and a radially retracted non-cutting on non-machining position; the generating head assembly includes an actuating structure for providing relative rotation between the generating head and the workpiece and a rotary motor mounted with the generating head; the rotary motor is selectively operable to rotate an actuating shaft relative to the generating head to actuate the cutting or machining members to their radially advanced and retracted positions without axial thrust loads being applied to the generating head.

Abstract: An improved structure supports a bearing in a bore provided in a portion of a transmission case and prevents relative rotation therebetween. In a preferred embodiment, the clutch housing portion of a transmission case is made from aluminum and includes an interior wall having a bore formed therein. A circumferential groove is formed in the side wall of the bore, and a compressible or elastomeric O-ring is disposed in the groove. A bearing is made from steel and includes an inner race, an outer race, and a plurality of rollers disposed between the races. As the bearing is pressed into the bore, the O-ring is compressed completely within the groove. So long as both the aluminum clutch housing and the steel outer race of the bearing remain in a relatively cold condition, the outer race will frictionally engage the inner surface of the bore, thus preventing any relative rotational movement therebetween.

Abstract: A bearing assembly comprises a piston mounted within and capable of reciprocating movement with respect of a fixed bearing shell. The bearing shell is provided with openings for the supply of a bearing medium, such as compressed air, into a clearance between the piston and the bearing shell. The bearing shell is resilient so that as the diameter of the piston increases due to thermal expansion, the diameter of the bearing shell changes to automatically maintain the clearance therebetween.

Abstract: A combination of a fixed and moving surface, which may in a common example comprise a rotating journal facing a thrust plate, characterized in that both parts are made of materials or material combinations chosen such that, as the temperature rises, the gap between the bearing surfaces becomes smaller due to the different thermal expansion of the relevant parts.The high coefficient expansion material includes a relatively shallow recess near the center of the bearing. This recess allows the expansion material to expand with temperature in order to decrease the gap and maintain the stiffness of the bearing. As the temperature rises, the fluid is forced out of the recess region and into the effective bearing gap thereby maintaining the overall stiffness of the bearing, which would otherwise fall as fluid viscosity drops.

Abstract: A circular knitting machine is provided that has a bed member and a needle cylinder including a cylinder base rotatably mounted to the bed member. The knitting machine also has a bearing assembly positioned between the bed member and the cylinder base for rotatable mounting of the bed member to the cylinder base. First and second tracks are respectively mounted to the first and second races, and bearings are positionally supported by and between the first and second tracks so that the cylinder base freely rotates about the bed member. A thermal-expansion compensator is preferably integrally formed with either the cylinder base or the bed member and is positioned closely adjacent the corresponding race respectively connected to either the cylinder base or the bed member. The compensator is adapted for compensating for thermal expansion in the cylinder base during heating and cooling thereof.

Abstract: A roll press with two press rolls which together form a press gap and whose axes are situated in a press plane. A journal is disposed on the ends of each roll, with pillow blocks for receiving the journals, with a rack for supporting the pillow blocks, and with tie rods which are arranged on both sides of the press plane and at least approximately parallel to it. Cradles are provided which support the pillow blocks. Between the cradles and the pillow blocks is an articulated joint which enables the pillow blocks to pivot about an axis which extends perpendicularly to the press plane and essentially in the axial plane of the respective roll.

Abstract: A bearing for a heated calendar roll comprises a bearing ring having a first surface. The bearing is rotatable about an axis. A first radially fixed hydrostatic bearing arcuate segment has a first surface which mates with the first surface of the bearing ring. The hydrostatic bearing has at least one bearing pocket. The bearing pocket has a device for permitting hydraulic fluid to flow into the at least one bearing pocket. The hydrostatic bearing is disposed substantially at a circumferential position with respect to the bearing which corresponds to a bearing load from the calendar roll. A second hydrostatic bearing arcuate segment has a first surface which mates with the first surface of the bearing ring. The second hydrostatic bearing has a first radially adjustable bearing pocket. The radially adjustable bearing pocket has a device for permitting hydraulic fluid to flow into the radially adjustable bearing pocket.

Abstract: An arrangement for concentrically positioning a first part relative to a second part, for example, a casing, or sleeve, (2) relative to a shaft (1), when the parts are made from materials with different coefficients of thermal expansion, provides a radial clearance (4) between the first and second parts. The first part (2) is supported along its length by portions facing radially away from the second part, at an abutment arrangement (7, 8) having the same or similar thermal expansion characteristics as the first part (2). The abutment arrangement (7, 8) is held concentric relative to the second part (1).

Abstract: The ball bearing assembly has a total stroke range comprising a first portion where a clearance fit is applied and a second range where an interference fit is applied. The interference stroke range is used to, for example, carry a platform where precise alignment is necessary, and deflections or other movement of the platform must be minimized. Use of the ball bearing assembly to carry a platform holding a semiconductor wafer to be probed is illustrated. After each wafer is probed, the ball cage is reset such that any migration of the ball cage is eliminated so that the clearance and interference stroke ranges return to predetermined values. Further provided are means for rotationally resetting the ball cage, providing for even wear over the entire surfaces of the shaft and housing in their working zones to increase the useful lifetime of the assembly.

Abstract: A method for improving the transient thermal properties of hydrostatic air main spindles for precision machine tools comprises the steps of installing an entire precision machine tool that has a main spindle with an air-lubricated hydrostatic bearing in a temperature-controlled constant-temperature environment, and raising the temperature of the lubricating air supplied to the air-lubricated hydrostatic bearing above the temperature of the constant-temperature environment until the thermal displacement of the main spindle reaches a target value, and thereafter lowering it below the temperature of the constant-temperature environment.

Abstract: A combination section consisting of a base section (1) and a covering section (2). The covering section (2) is of an anti-friction material having a coefficient of expansion deviating from that of the material of the base section (1), and is divided between fastening points into partial lengths (4). The partial lengths (4) are interconnected by deformable bridges (6). This makes it possible for the partial lengths (4) to expand essentially unhindered, independent of the expansion of the base section (1) to a different extent.

Abstract: A bearing assembly is disclosed in which a bearing having inner and outer races is seated in a manner which accommodates thermal expansion and contraction without allowing radial pressure to constrict the bearing. Two materials of differing coefficients of thermal expansion form the seat for the outer bearing race such that temperature variations cause the race to tilt around the ball of the bearing. The bearing assembly is particularly useful in rotary drive assemblies for antenna pedestals.

Abstract: A method of treating a surface of a machine element to permit the outer layers thereof to freely expand when repeatedly subjected to sudden temperature variations without thermal stressing the inner layers thereof.

Abstract: An anti-friction bearing unit, particularly for use in an exhaust gas turbo charger. The unit includes two anti-friction bearings axially spaced apart from each other on a shaft. High temperature occurs on one end of the shaft. A precise mounting is provided which is not sensitive to high temperatures on at least the axial side exposed to high temperature. The bearing outer ring, which is the ring not subject to high temperatures, consists of one piece. The bearing inner ring is widened and divided into two sections at its axial middle. The axial portion of the divided inner ring which is exposed to high temperature consists of material of high heat resistance. The high heat resistance material is, for example, 80 MoCrV 42 16 (M 50) or X 102 CRMo 17 (AISI 440 C). An additional intermediate ring around the shaft at the high temperature and helps reduce heat transmission.

Abstract: A feed-screw support structure is adapted to absorb thermal expansion of a feed screw in a machine tool. It comprises a main-body member, a bearing-holder at the one end of the feed screw slidably arranged in the main-body member, a clamping member provided between the bearing-holder member and the main-body member and adapted to fix these members, and a device for operating the clamping member in accordance with factors and matters related to heat generation in the feed-screw. The bearing-holder member being normally held in a stationary condition by the clamping member, the feed screw being allowed to relieve thermal expansion by temporarily releasing the stationary condition when heat generation in the feed screw takes place to a relatively large degree.

Abstract: A sealed anti-friction bearing including an outer ring and inner shaft and two axially spaced sets of races defined in them for rolling element balls, and a respective seal between the outer ring and the shaft axially outward of each of the sets of rolling for elements defining an enclosed space between the seals. A die cast housing cast outside the outer ring. In the axial region of each set of races and their respective adjacent seal, the cast housing including a plurality of axially extending, circumferentially spaced apart, radially projecting ribs generally arranged in a "star shape". The ribs at one set of races open radially outward of the housing and the ribs at the other set of races open radially outward into the remaining solid body of the housing.

Abstract: The monitoring device is constructed in such a way that the temperature measurement takes place directly at the bearing and there is no need for detaching connecting lines during changing of rolls. The main features of the monitoring device for roll bearings, installed, for example, in the chock (1) of the work roll (3) of a roll stand, reside in a thermal limit value pickup (6) in contact with the roll bearing (7), as well as in a mechanical, spring-loaded transmission member (8) locked in place in the chock (1) by way of the limit value pickup, for acting on a signal generator (9) arranged outside of the chock (1) in the roll stand, this signal generator being actuated to shut down the rolling mill by automatic outward movement of the transmission member (8) after releasing its locking device by the limit value pickup (6) upon reaching a limit temperature of the roll bearing (7). The monitoring device is preferably intended for use in thin-gage strip and foil rolling mills having high rolling speeds.

Abstract: The vertical-axis electrical machine of umbrella design has a disc-shaped rotor (4), the combined thrust and guide bearing (12) which is mounted at the disc underside. The bearing rests on a bearing support structure (17), which has the shape of a hollow truncated cone and is supported directly on the foundation (1). This arrangement is distinguished by low design height. Elongations of the bearing support structure (17) caused by temperature are converted without loss of stiffness and centering into axial displacement of the end of the hollow truncated cone (17) on the bearing side.

Abstract: A plastic roller clutch cage has centrally located rigid connectors joining roller pockets together at symmetrically deformable portions of the roller pockets to allow the cage to adapt itself to differentially expanding and contracting clutch races without distorting the cages.

Abstract: An adapter element that allows machine elements to be accommodated in a centered manner with zero play, with these machine elements having different thermal expansions over broad temperature ranges. The adapter element has a sleeve-like portion that has tongue-like regions defined therefrom. Flattened or planar regions are provided on the inner and/or outer surface of the sleeve-like portion, with these planar regions at least partially overlapping the tongue-like regions.

Abstract: The fluid friction clutch, suitable especially for the cooling fan of an internal combustion engine, has an aluminum housing mounted rotatably by means of a rolling bearing on a drive shaft. The outer race ring of the bearing is seated directly in a tubular bearing extension piece of the aluminum housing. A ring part, held on the bearing extension piece, of a material with lower coefficient of thermal expansion than aluminum, is secured on the bearing extension piece and prevents its widening with rising working temperature.

Abstract: A flexible liner for bearing assemblies and the like including a flexible sleeve having first and second sides and a plurality of first and second slots formed therein. The first slots are positioned adjacent the first side of the flexible sleeve. The second slots are disposed adjacent the second side of the flexible sleeve. The first slots are offset from the second slots such that no other first slot is aligned with a second slot. The first and second slots form a plurality of first and second tabs positioned on opposing sides of the flexible sleeve. The first tabs are offset from the second tabs so that the flexible liner exerts a continuous force about the outer periphery. The flexible liner further includes first and second layers. The first layer is formed from a material having a coefficient of expansion greater than material forming the second layer.

Abstract: A tilt pad bearing assembly for use in supporting a rotating shaft is disclosed. The bearing assembly includes lubricant means for effectively cooling separate individual bearing pads, and separate cooling channels for selectively cooling a portion of the bearing pad. The bearing pads each have a specific end treatment to act in combination to provide an anti-spragging effect. Additionally by selectively cooling a portion of the bearing pad, the bearing pad may have separate configurations for low speed and high speed applications such that boundary lubrication is achieved under low speed conditions and dynamic lubrication is achieved under high speed conditions.

Abstract: Fluid-cooled electrical apparatus characterized by a new and improved pump for circulating the fluid within the apparatus. The pump has a motor portion in fluid communication with a pump portion, non-electrically conductive bearings supporting a common shaft between the two portions. The bearings being comprised of a polyamideimide thermoplastic resin.

Abstract: A cage assembly for an overrunning clutch is formed with a cage body of molded plastic that is initially unitary, and which can therefore be easily handled. The joinder of metal end rings to the cage body serves to fracture it into a plurality of separate pieces, which are maintained in substantially their original positions by their joinder to the end rings. The completed cage assembly can also, therefore, be handled with the ease of a unitary structure. After installation, the fracture of the cage body allows its separate pieces, which include support portions, to maintain the races of a clutch coaxial to one another, but to operate independently, substantially like a conventional, separate piece cage assembly.

Abstract: A conveyor roller and bearing assembly designed to rotate around a fixed shaft in a conveyor frame is disclosed having a polymeric roller constructed and arranged to minimize the generation of production noise and static electricity, a polymeric spherical bearing capable of freely rotating within a shaft subjected to more than the normal degree of deflectional rotation while generating a minimum of friction and heat, and a spring loaded shaft designed for easy installation in a conveyor frame.

Abstract: A positioning apparatus for accurately positioning an object such as a work has a guide track secured to the associated frame by a plurality of tightening devices each having a tightening force adjusting member. The guide track is also pressed laterally against a vertical face portion formed on the associated frame by means of a plurality of pressing plates which are affixed to the frame by other tightening devices each having a pressing force adjusting member. Both the tightening devices securely holds the guide track on the frame while allowing relative movement therebetween caused by a difference in the amount of thermal expansion.

Abstract: An antifriction bearing having inner and outer race rings and a seal ring featuring a multiplicity of resilient seal ring retaining projections for compressive wedging engagement within a retaining groove of the outer bearing ring.

Abstract: The shaft of a dressing tool for grinding wheels is rotatable in two spaced-apart sets of roller bearings each of which is mounted in the radially extending leg of a discrete housing section. The two sections are connected to each other by two packages of leaf springs which extend radially of and are disposed at one side of the shaft and allow for uninterrupted thermally induced changes in the length of the shaft while preventing appreciable radial movements of the two sets of bearings relative to each other. One radially extending leg is integral with a third leg which is spaced apart from and is parallel to the shaft and is connected with the other radially extending leg by the two packages of leaf springs.

Abstract: A mounting of a shaft in the bore of a housing by two antifriction bearings mounted in a sleeve at a distance from each other, the said sleeve being arranged in the bore of a housing having a higher coefficient of thermal expansion than the mounting elements and being provided with a radially outwardly directed flange, the flange being pressed by elastic spring means against a contact surface of the housing traversed by the bore whereby frictional engagement exists between the said surface and the flange characterized in that the sleeve and housing are axially braced with the elastic spring means preferably yielding axially and abutting a housing surface plane parallel to the contact surface and radially supporting the sleeve in relation to the housing, and a method of assembling the said mounting.

Abstract: A rectilinear guide comprises a first member with a second member coaxially movable in the first member. One of the members comprises bearing elements and the other member comprises axial guide surfaces on which the bearing elements are movable, and which are disposed in planes containing the coinciding central axes of the two members.