Showing papers on "Bearing (mechanical) published in 1979"

Surgical power tool

Abstract: A surgical power tool in which a quick-lock latch mechanism permits attachment and removal of the drive shaft assembly with one hand and a seal arrangement effectively seals moisture from the bearing and motor compartments, yet creates only minimal drag on the motor. The power unit portion has a female end which receives the male end of the drive shaft assembly. Outwardly extending pins from the male portion pass through aligned notches in a rotatable cap portion and in the female end, and are locked in place by rotation of the cap. The seal consists of a nylon bushing on the shaft, slightly less in diameter than the internal bore of the tool, and a mica seal fitted within the bore but loosely on the shaft, the bushing and mica seal seating on each other when the tool is shut off to maintain an effective seal while the tool is inoperative.

Emergency oil/mist system

Abstract: An emergency oil/mist system is embodied in the main lubrication system for a bearing or gear box assembly of a gas turbine engine, and includes an auxiliary reservoir interconnected between the main source of pressurized lubricant and an air aspirating nozzle which is capable of either providing a stream of oil to the bearing, or a mist of lubricant to the bearing. A source of pressurized air is connected to the air aspirating nozzle through a control piston valve, and the latter also is provided in a vent line extending between the auxiliary reservoir and the atmosphere. During normal operation of the main lubrication system, the source of pressurized oil is connected through the auxiliary reservoir to the nozzle for providing a stream of lubricant to the bearing. Upon failure of the source of pressurized lubricant, the control piston valve is actuated so as to connect the auxiliary or emergency lubricant reservoir to the atmosphere by the vent conduit, and simultaneously connect the source of pressurized air to the air aspirating nozzle. The pressurized air passing through the nozzle aspirates or draws oil from the emergency reservoir to provide a spray or mist of lubricant to the bearing. The vent assures that the oil in the auxiliary reservoir is withdrawn at a controlled rate, thereby providing a spray of lubricant to the bearing for a limited period of time to enable the engine to maintain its operation. The emergency system produces an ultrasonic impingement of the oil as it leaves the air aspirating nozzle so as to create extremely small droplets of uniform distribution of oil on the bearing.

System for monitoring bearings and other rotating equipment

Abstract: A self-powered monitor unit with a tuned mechanical resonator power unit and a radio transmitter is mounted on every piece of rotating equipment being monitored, such as machinery with ball bearings. Bearing vibrations are sensed and the generation of a defect signal triggers the transmission of a radio signal modulated to identify the source. A central station receives and demodulates an emitted radio signal and displays the location with a fault condition. Large numbers of equipment can be monitored conveniently by unattended units.

Stiffness and Damping Coefficients for the Five-Pad Tilting-Pad Bearing

Abstract: Stiffness and damping coefficients are presented for the 5-pad tilt-pad bearing for various preloads, offsets, length to diameter ratios and pad loadings (on and between pad) Finite elements and the pad assembly method are used to calculate these coefficients and the effects of the unloaded pads are included Design curves suitable for tilt-pad bearings in widespread industrial use are presented Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Kansas City, Missouri, October 3–5, 1977

The Relative Thickness of Grease and Oil Films in Rolling Bearings

Abstract: A method for measuring the thickness of grease films between the rollers and rings of rolling bearings is described. Measurements in two designs of bearing show that a grease can initially form thi...

Linear rolling bearing

Abstract: A linear rolling bearing has an outer housing with a central bore. A plurality of radially inwardly directed axially extending projections in the bore form races for rolling elements under load, and surfaces between the projections serve as return races. A cage within the bore has a plurality of axially extending guide channels, and semicircular guide channels interconnect pairs of the guide channels to form endless channels for the rolling elements. The outer housing has inclined surfaces joining the corresponding races for loaded and unloaded rolling elements, whereby the inclined surfaces steplessly interconnect the respective races and extend radially outwardly from each of these races.

Apparatus for perforating oil and gas wells

Abstract: A system for perforating the subsurface formation located in the area of an oil or gas bore hole in which a high powered coherent light beam axially is directed along the bore hole to a predetermined depth therein from a surface location, the beam is deflected at said depth along a deflected beam axis. The beam is focused at said depth to concentrate the beam at each of a plurality of spaced focal points along the deflected beam axis. There is provided (1) a significant increase in the distance (length) to which the calculated oil or gas bearing formations can be perforated (from a present nominal 18 inches to 200 feet or more), thus providing the opportunity for increased yield; and (2) an accurate determination of the exact near horizontal plan orientation of such perforations so that each can be aimed in the direction of the most promising formation pay zone.

Compliant journal bearing with angular stiffness gradient

Abstract: A hydrodynamic compliant journal bearing for dynamically supporting a rotating shaft in a journal sleeve, includes three pads, each having a flexible bearing sheet attached to the sleeve along one edge and a resilient supporting structure attached to the sleeve under the bearing sheet for compliantly supporting the bearing sheet to support the shaft. The resilient support has a series of resilient elevations which increase in stiffness in the direction of shaft rotation so that the pad assumes a profile under hydrodynamic loading which increases in inclination with increasing shaft speed to maintain bearing stability over the full load range.

Bearing structure for a rotary rock bit

Abstract: A rotary rock bit is disclosed having bearing surfaces utilized therein which have extremely long wear resistant properties. The rock bit comprises a plurality of legs extending downwardly from a main bit body. A cone cutter is rotatively mounted on a journal formed on each leg. One or more of the interengaging bearing surfaces between the cone and the journal includes a layer of diamond material mounted on a substrate of carbide. In one embodiment, the bearing material forms the thrust button adjacent the spindle located at the end of the journal. In another embodiment, the bearing material is located on the interengaging axial faces of the journal and cone. In still another embodiment, the bearing material is a segmented cylindrical bearing located in a circumferential groove formed in the journal.

Oil cooling for an electrical generator

Abstract: For more effective cooling of directly driven claw-pole, typically automotive alternators, a system of internal passageways is provided through which cooling oil is forced from the pressurized engine oil supply system. The oil flows directly over surfaces of the rectifiers or their heat sink, the exciter core, and the stator housing. A portion of the oil is branched off in a metered quantity at the inlet directly to a shaft bearing, which it cools and lubricates. Various passageways systems are described, including one which permits electrical feed-throughs and the diodes to be mounted dry. A particular configuration is described for a shaft bearing, in which between an armor bushing and a cast bearing support hub there are annular oil channels connected to longitudinal oil channels to evenly distribute the pressurized oil around the bearing.

Vacuum-sealed gas-bearing assembly

Abstract: An integral vacuum-sealed gas-bearing assembly comprising a combination of gas-bearing elements and vacuum plenums such that a gas seal is maintained across the bearing separating two assemblies to allow one assembly to be moved relative to the other in finite increments while maintaining an internal vacuum environment.

Cushioning material construction

Abstract: A cushioning material system or construction having at least one module comprising balanced levers and displaceable bearing means, as incorporated in footwear, and such a cushioning material further comprising bearing plates attached to a plurality of said modules which may be made in sheet form for various cushioning purposes.

Bearing damper system

Abstract: Apparatus for supporting a rotating member such as a shaft associated with a gas turbine engine, is provided wherein the relative movement between a bearing assembly and a bearing support is prevented during a first mode of operation wherein the rotating member is rotating in a normal balance condition and relative movement is permitted during a second mode of operation wherein the rotating member is rotating in an abnormal balance condition.

Fastener, esp. for ski boots, with rotary drum and tie - has self-locking eccentric bearing for fine adjustment

Abstract: The self-locking eccentric gear forms the reduction gear set between the rotary member mounted on the bearing element (18) mounted on one of the boot parts and the drum set in the bearing element (18). A drive shaft (32) connected to the rotary member is also rotatably mounted in the bearing element while the eccentric pin (34) is set eccentric relative to the axis of the drive shaft (32). An inner wheel (35) with inner wheel gearing (38) is rotatably mounted on the eccentric pin (34) while a bearing element gearing (42) is fixedly mounted on the bearing element (18). The drum (44) itself is connected fixed against rotation to the inner wheel (36).

Filtration Effects on Ball Bearing Life and Condition in a Contaminated Lubricant

Abstract: Ball bearings were fatigue tested with a noncontaminated lubricant and with a contaminated lubricant under four levels of filtration. The test filters had absolute particle removal ratings of 3, 30, 49, and 105 microns. Aircraft turbine engine contaminants were injected into the filter's supply line at a constant rate of 125 milligrams per bearing hour. Bearing life and running track condition generally improved with finer filtration. The experimental lives of 3 and 30 micron filter bearings were statistically equivalent, approaching those obtained with the noncontaminated lubricant bearings. Compared to these bearings, the lives of the 49 micron bearings were statistically lower. The 105 micron bearings experienced gross wear. The degree of surface distress, weight loss, and probable failure mode were dependent on filtration level, with finer filtration being clearly beneficial.

Composite material compliant bearing element

Abstract: A compliant fluid film bearing includes a thin, flexible bearing sheet supported on a resilient bump-form support member which is divided into multiple adjacent strips. The bearing sheet and support member are each formed of a composite material made of Inconel X-750 and copper. The Inconel sheet, in annealed condition, is cut and formed in the desired shape and is coated with copper. The sheet is heat treated in an oxygen-free atmosphere to give the Inconel the small grain size for the desired properties of strength and hardness. During the heat treatment, the copper diffuses into the Inconel, producing at the end a composite material of Inconel X-750 having a diffusion of copper into its top portion such that the top surface is about 100% copper, and the copper fraction decreases exponentially with the depth into the Inconel sheet. The bearing elements formed of this composite material provide improved coulomb and viscous damping and improved bearing load capacity and stability at high temperature and speed.

Rocker-sliding bearing assembly and a method of lining the assembly

Abstract: A rocker-sliding bearing for bridges or similar structures and a method of lining the concave top side surface of a curved baseplate of a rocker-slider bearing wherein the rocker-slider bearing includes a flat top plate, an intermediate plate having a flat top side and a convex curved underside surface, a bedplate and a baseplate having a correspondingly concave curved top side surface in turn secured to the bedplate, the curved surface on the top of the baseplate including a lining of corrosion-resistant material and the curved surface of the intermediate plate including a lining with a low coefficient of friction relative to the highly corrosion-resistant material on the curved surface of the baseplate wherein the lining on the curved surface of the baseplate includes a preformed curved disc positioned on the baseplate and secured to the concave top side thereof.

Geometry Effects in Tilting-Pad Journal Bearings

Abstract: A theoretical study has been undertaken to show the influence of bearing geometry on the steady-state and dynamic behavior of tilling-pad journal bearings. The computer model used takes into account a different viscosity on each pad, turbulence in the oil film and pad inertia. The geometric changes considered include the pad clearance and the bearing clearance, the length/diameter ratio, the number of pads, and the orientation of the bearing with respect to the load direction. The major operating characteristics which have been examined are oil film thickness, pad temperature, power loss, and oil film stiffness and damping. The basic form of bearing against which changes in geometry are compared has 5 centrally pivoted pads with a length/diameter ratio of 0.4. The bearing diameters considered in the theoretical study are 160 mm and 400 mm. Comparisons with experiment are also made for bearings having diameters of 160 mm and 430 mm. Presented at the 33rd Annual Meeting in Dearborn, Michigan, April 17–20, 1978

Method and apparatus for preventing contamination of a rotating magnetic disc

Abstract: A method and apparatus are provided for preventing contamination of a rotating magnetic disc by particles outgassed from or through the bearings upon which the disc is mounted for rotation. This is accomplished by maintaining a differential pressure aross the bearing nearest the magnetic disc compartment with the higher pressure inside the compartment so that any particles outgassed from the bearing or bearing chamber are constrained to migrate toward a region of lower pressure within the bearing chamber and therefore away from the magnetic disc compartment.

Camera film magazine

Abstract: A film magazine contains a roll of film wound on a core with a journal rotatable in a split bearing. The journal and the bearing have complementary, non-circular cross-sectional surfaces which inhibit unwinding rotation of the core until the bearing halves are separated by insertion into a camera.

Exhaust gas turbocharger

Abstract: An apparatus for turbocharging an internal combustion engine, and which is characterized by the ability to avoid excessive heat transfer to the bearings and any other heat sensitive components. In the preferred embodiment, the lubricating oil for the bearings in the turbocharger housing is directed through a passageway in the bearing shaft and is discharged onto the end wall of the bearing housing in a circular pattern, to thereby cool the end wall and minimize heat transfer from the turbine to the bearings in the housing. Also, the end wall of the bearing housing is spaced from the adjacent rear wall of the turbine housing to define a cooling air gap therebetween, and apertures are provided in the housing for permitting air to flow through the cooling gap to cool the opposing surfaces of the two adjacent walls and thereby minimize heat transfer therebetween. Still further, the turbocharger of the present invention may include an air duct for conveying a portion of the compressed air into the turbine housing, to thereby lower the temperature of the exhaust gases and thus also the temperature of the turbine.

Well riser support having elastomeric bearings

Abstract: A well riser support for supporting and guiding an assembly of well riser pipe through a rotary table to facilitate coupling or uncoupling joints of riser pipe to the riser assembly. The support includes a spider assembly containing a plurality of hydraulically actuated dogs for supporting the riser and a plurality of resilient bearings supporting the spider assembly. Each bearing is configured to absorb and distribute loads applied parallel to and transversely of the riser axis, and comprises alternating layers of elastomeric and non-elastomeric materials with the compression axis of the bearing being inclined with respect to the riser axis.

Drill bit bearing

Abstract: The bearing surface of a cone cutter bit is hard-faced by forming a substantially cylindrical bearing structure on the drill bit leg having a diameter less than that of the mating bearing on said cone cutter. A cylindrical tubular sleeve of hard low friction metal which has an inner diameter greater than the diameter of said cylindrical bearing structure is inserted over said bearing structure, and a disc is placed over the end and inside said tubular metal sleeve. Solder is flowed between the sleeve and the disc to attach the sleeve and disc to the bearing structure to create a hard-faced bearing. Openings can be preformed in the sleeve or disc to match fluid cooling holes in the drill bit leg.

Double-seat valve

Abstract: The invention relates to a double seat valve with a housing part in which there are two mutually adjacent valve seats and with two valve elements, which can be pressed alternately onto the two valve seats by a lever pivotable about a rocker bearing. The solution according to the invention essentially comprises a first bearing rib, which is arranged in the first housing part, between the valve seats, a second bearing rib, which is arranged on the lever, and an elastic second housing part, which connects the first housing part and the lever to one another in such a way that the bearing ribs are held in the correct position relative to one another. The second housing part also carries the valve elements. The purpose of the invention is to simplify a double seat valve to such an extent, in particular by virtue of the configuration of the rocker bearing and the arrangement of the valve elements, in such a way that the required overall volume is reduced and the effort involved in manufacture and the costs are reduced. The two bearing ribs of the rocker bearing roll on one another virtually without friction, with the result that only small actuating forces are required for the actuation of the double seat valve.

Stepped, split, cantilevered compliant bearing support

Abstract: A compliant hydrodynamic fluid film bearing made of three or more pads, each having a thin, flexible bearing sheet supported by a resilient support element fastened to a mount. A set of split, tiered stiffener sheets is fastened between the bearing sheet and the support element to provide an increasing stiffness gradient to the pad from its leading to trailing edges. The support element includes a plurality of resilient elevations that also increase in stiffness toward the trailing edge for the same purpose. The pad profile changes with changing hydrodynamic loading to present an optimal profile for maximal load carrying over the full speed range of the bearing.

Floating seal for drill bits

Abstract: A rolling cone cutter earth boring bit is provided with a floating seal for sealing the bearings of the bit from the abrasive materials in the borehole and retaining lubricant within the bearing area. At least one cantilevered bearing pin extends from the arm of the bit. A cutter receiving surface is located on the arm. A first shallow annular groove is located in said cutter receiving surface. A rolling cone cutter is adapted to be rotatably mounted on the bearing pin with said rolling cone cutter having a cone mouth. A second shallow annular groove is located within said cone mouth. Bearing and cutter retaining means are located between the bearing pin and the cone cutter. A first seal unit is positioned around the bearing pin between the cutter receiving surface and the rolling cone cutter. The first seal unit includes a first annular rigid ring positioned around the bearing pin and a first resilient ring located in the first shallow annular groove between the first annular rigid ring and the cutter receiving surface. A second seal unit is positioned around the bearing pin and located within the cone mouth. The second seal unit includes a second annular rigid ring positioned around the bearing pin within the cone mouth and a second resilient ring located in the second shallow annular groove between the second annular rigid ring and the cone mouth. The first and second seal units cooperate when the rolling cone cutter is mounted on the bearing pin so that the first and second resilient rings urge the first and second annular rigid rings into sliding contact as the cone cutter rotates about the bearing pin.