Abstract: A bearing has a composite elastic member, which supports a shaft. The composite elastic member comprises an elastic cylinder, which is made of an elastic material such as rubber and is provided at a bearing body section; and a spiral member, which projects from the circumferential surface of the elastic cylinder and is spirally assembled on the elastic cylinder. A lubricant is supplied to a spiral gap, which is divisionally formed between threads of the wire material forming the spiral member. When the shaft rotates, leakage of the lubricant is prevented by pumping operation and leakage of a fluid is prevented.

Abstract: A sliding bearing of a cylindrical shape which bearing is adapted to support a rotation shaft through a lubricant film, comprising a plurality of fine grooves juxtaposed on an inner peripheral face of said sliding bearing in a circumferential direction of the bearing, each of said grooves extending from a backward position of a minimum lubricant film thickness portion at which the lubricant film becomes minimum in thickness on the rotation of said shaft, to a forward position of said minimum lubricant film thickness portion.

Abstract: A disk driving apparatus using a dynamic pressure-type bearing device of an oil lubrication type, wherein the bearing device includes a housing main body, a sleeve part fixed to the housing main body, a rotor part relatively rotatable to the housing main body, a shaft having a spherical front end clamped to the rotor part, a bottom plate at an end face of the shaft and a thrust member interposed between the shaft and the bottom plate has a dynamic pressure radial bearing constructed by the shaft and the sleeve part and having herringbone grooves formed at either of the shaft and sleeve part, the thrust member being formed of a high polymer, and a thrust pivot bearing constructed by the thrust member set at the bottom plate secured to one side of the sleeve part and one end of the shaft.

Abstract: A roller supporting device comprises a pair of supporting arms, a supporting shaft attached between the pair of supporting arms in a non-rotatable manner, and a roller having an inner hole in the central part thereof, the roller being disposed between the pair of supporting arms and being supported in a rotatable manner by the supporting shaft inserted through the inner hole, the roller being arranged to rotate along with the relative movement with a mating member by making the roller contact with the mating member, wherein a cut out portion, which extends in the axial direction on the outer circumferential surface of the supporting shaft, is formed at an appropriate portion except the portion on which the inner circumferential surface of the inner hole of the roller is pressed due to the load applied to the roller from the mating member, thereby defining an oil passage which extends in the axial direction between the supporting shaft and the inner circumferential surface of the inner hole of the roller.

Abstract: A hydrodynamic bearing apparatus comprises a shaft and a bearing having facing hydrodynamic surfaces therebetween. Hydrodynamic pressure generating grooves are disposed on at least one of the facing hydrodynamic surfaces of the shaft and bearing. The apparatus relatively rotatably supports the shaft and bearing by the hydrodynamic pressure from a lubricant fluid filled between the facing hydrodynamic surfaces. One of the shaft and bearing, on which the hydrodynamic pressure generating grooves are formed, are made of a metallic material whose thermal expansion coefficient is smaller than that of a copper containing material. A working layer made of the copper containing material is formed on the hydrodynamic surface side of the metallic material. The surface of the working layer functions as the hydrodynamic surface. The hydrodynamic pressure generating grooves are formed on the working layer.

Abstract: The invention provides a dynamic pressure bearing capable of generating enough dynamic pressure even with the use of a porous material. Dynamic pressure grooves at an inner circumferential surface of a sleeve made of porous material are formed by rolling process. Voids of the porous material at a surface of the dynamic pressure grooves are crushed by this rolling process, making the dynamic pressure grooves airtight. Further, the inner circumferential surface at which the dynamic pressure grooves are formed is subject to a sizing process, by which a bearing surface of the sleeve is crushed so that substantially no voids are present.

Abstract: A water lubricated bearing or water lubricated seal using water as a lubricant. The bearing or seal has: a rotary member secured directly or indirectly to a rotary side, and a stationary member secured directly or indirectly to a stationary side and facing the rotary member for making sliding contact therewith. A substrate of either one of the rotary member and the stationary member is a metallic material and a thin titanium nitride film is formed on the sliding surface thereof. The other member is made of a non-brittle material or a film of hard material is formed on the sliding surface thereof. Thereby, a coefficient of friction of the bearing or seal is reduced and a wear resistance of the same is improved.

Abstract: A pinch roller type tape drive assembly which is one of the elements composing a tape driving system of a VCR and ensures stable running of a tape. The pinch roller type tape drive assembly has a capstan for rotating at a constant velocity and a pinch roller which self-aligns, for pressing a tape against the capstan so as to drive the tape at the constant velocity together with the capstan. When the pinch roller is pressed against the capstan, an annular self-aligning member disposed between an inner sleeve and an outer sleeve is compressed in the direction of the contact point of the capstan and the pinch roller toward a pinch roller shaft, thereby holding the gap between the capstan and the pinch roller.

Abstract: A rotary drum assembly is arranged so that upper and lower drums can rotate about a central shaft with respect to each other via a dynamic-pressure bearing. In the rotary drum assembly, the central shaft is press-fitted into the rotary upper drum, a sleeve which is formed so that the central shaft can be rotatably fitted thereinto is supported by the fixed lower drum, and a dynamic-pressure generating groove is formed in either one of the central shaft and the sleeve, whereby a dynamic-pressure bearing is formed between the central shaft and the sleeve.

Abstract: An improved porous bearing and a motor which is provided with the porous bearing in which the friction losses and reflection of shaft are reduced, noises caused by the vibrations are avoided with low cogging or low jitter, and in addition, the manufacturing process is simplified to obtain long-life products at low cost. The number (C) of grooves of the porous bearing meets at least one of the following equations:nA+mB-C.noteq.0, nA-C.noteq.0 and mB-C.noteq.0wherein A is the number of magnetic poles of the motor magnet, B is the number of the slots of the armature, and n and m are integers, respectively.

Abstract: A positioning pivot including a shaft, at least one sleeve and at least one hinge butt is able to prolong its lifespan by inserting the sleeve between the shaft and the hinge butt after a combination of the shaft and the hinge butt is accomplished. Due to an opposite difference between an orientation of a helical slit defined in the sleeve and a helical groove defined in an outer periphery of the shaft, lubricant added to the helical groove is able to be disperse to other portions of the shaft when the sleeve is securely retained within the hinge butt and the shaft is rotated. Additionally, a portion of the shaft is configured to be hollow, so that even when a relationship between the portion and the sleeve is loosened, a dimension of the portion of the shaft is able to be enlarged by an adjusting element to regain tight relationship between the portion of the shaft and the sleeve again.

Abstract: A self pressurizing journal bearing assembly includes a tubular housing having a bore defining a plain cylindrical journal bearing, and a cylindrical rotary shaft disposed coaxially therein. The shaft includes a plain cylindrical journal spaced radially inwardly of the bearing to define a journal bearing gap. A screw pump is defined in part by a portion of the shaft, and is disposed inside the housing bore in flow communication with the journal bearing for continually circulating a lubricant thereto under pressure upon rotation of the shaft for accommodating lubricant end leakage from the journal bearing.

Abstract: The invention provides a bearing including an inner bearing surface that is formed by a layer of self-lubricating material and that contains axially extending and circumferentially spaced apart lubrication grooves. The inner bearing surface and the grooves therein are formed by conforming the self-lubricating material to the outer surface of a mandrel that has elongated members supported thereon so that the elongated members form the lubrication grooves. An overlayment is then applied on the layer of self-lubricating material, the overlayment including a plurality of filaments wound around the layer of self-lubricating material, and a hardenable liquid to bond the layer of self-lubricating material to the overlayment.

Abstract: The present invention includes four sections or partitions: two thrust bearings which are formed by the sides of a grooved thrust plate and corresponding countersurfaces, the thrust bearings designed to cause fluid flow in a single direction up around the rotating thrust plate and upward along the surface of a rotating journal, and two journal bearings formed side-by-side on the journal formed between a rotating shaft and a bushing with multiple spiral-grooved sections being formed on the rotating shaft or in the stationary bushing. The two journal bearings are separated by a circumferential groove in the shaft which is connected by a radial bore to a hollow reservoir in the shaft for providing fluid to the journal bearing and the thrust bearing. By providing this bore and a second bore located near to the thrust bearing, the boundary conditions for the combined journal bearings and thrust bearings are fixed and a stable rotating shaft is achieved.

Abstract: A rotating polygon mirror driving apparatus has a rotor having a rotating polygon mirror fixed thereto, a rotational shaft and a rotor magnet; a bracket having a base plate provided opposite to the rotor magnet and a collar forming a bearing holding portion of a resin outserted to the base plate and made; and a bearing fitted to the bracket so as to support the rotational shaft. The driving apparatus can be decreased in cost and thickness while maintaining excellent rotational precision and mechanical precision.

Abstract: A hydrodynamic bearing journaling a shaft includes a rotatable bushing journaling the shaft and thrust plates on the shaft at opposite ends of the bushing. The bushing is encased in a cylindrical sleeve. Lubricant containing clearance spaces are formed between the shaft, bushing, sleeve, and thrust plates. One or more internal helical passages are formed between the bushing and sleeve and open into the axial ends thereof adjacent to the thrust plates. An internal radial chamber between the bushing and sleeve opens into the helical channel through radial ports for providing lubricant between the journal bearing and the shaft and thrust plates.

Abstract: Disclosed is the improvement in a dynamic air pressure bearing in which a rotor is supported at high speed in the non-contact state. In an optical deflector, a stationary shaft is planted at the center portion of a housing. A stator core is disposed on a stud. A magnet yoke is integrated with a sleeve rotated relative to the stationary shaft. The magnet yoke contains an inner magnet and an outer magnet. A rotary polygonal mirror is mounted on a flange fixed on the sleeve by means of a center screw and a mirror cap. The rotary polygonal mirror is rotated at high speed together with the sleeve relative to the stationary shaft, thus constituting a dynamic air pressure bearing between the shaft and the sleeve. The stationary shaft is constituted of a main body and a ring-like bearing member fitted in the main body. The bearing member is formed of a ceramic material and formed with grooves for generating dynamic air pressure. The sleeve is preferably constituted of a main body and a bearing member of ceramic.

Abstract: A cylindrical bearing with a solid lubricant embedded and fixed in a plurality of first and second helical grooves formed in an inner peripheral surface thereof, wherein each first helical groove is formed with a rightward rising inclination at an angle .theta..sub.1 of more than 0.degree. and not more than 45.degree. with respect to a reference line, while each second helical groove is formed with a leftward rising inclination at an angle .theta..sub.2 of more than 0.degree. and not more than 45.degree. with respect to the reference line, a line which connects shorter diagonal lines of parallelograms each formed by connecting points of intersection of adjacent ones of the first helical grooves and adjacent ones of the second helical grooves intersecting with the adjacent ones of the first helical grooves forms an angle .theta..sub.3 of less than 90.degree. with respect to the reference line.

Abstract: An oil scavenge assembly for small gas turbine engine. The assembly includes a rolling element bearing, for supporting a rotating shaft, slip fit within a bearing liner. The bearing liner has a plurality of helical grooves along its surface. A plurality of circumferentially spaced scoops extend inward from the liner and direct the oil expelled from the bearing into the helical grooves.

Abstract: A dynamic fluid bearing rotating apparatus comprises a shaft, a sleeve rotatably fitted to the shaft, a fixed member formed of a resin material, the fixed member being molded integrally with the sleeve, and a driver for rotating the shaft.

Abstract: A pneumatic and magnetic bearing type motor provides a hollow rotary member fitted rotatably on a stationary shaft, radial pneumatic bearings having dynamic pressure generating grooves formed on one of the stationary shaft and hollow rotary member, supporting the hollow rotary member in a radial direction with the aid of dynamic pressures generated, and a thrust magnetic bearing supporting the hollow rotary member in a thrust direction thereof. In the motor, the position where the hollow rotary member is supported by the thrust magnetic bearing is substantially coincident with the equilibrium point where moments of the pressures are equal, whereby the motor is substantially free from vibration during operation, and the bearings are substantially prevented from being damaged when the motor is started or stopped.

Abstract: An electric motor construction includes a rotor housing and sleeve which surrounds a shaft/thrust plate. The thrust plate is enclosed in a dead end cavity and is surrounded by a fluid which forms a fluid bearing. The shaft has asymmetrical grooves which create a net pressure gradient from a capillary seal formed near the bottom of the shaft toward the dead end cavity. This helps maintain the capillary seal and reduce the risk of cavitation.

Abstract: In a dynamic pressure bearing having a sleeve and a shaft fitted in the sleeve, dynamic pressure generating grooves are formed on an outer cylindrical surface of the shaft. The dynamic pressure generating grooves consist of first oblique grooves disposed in a first cylindrical zone of the outer cylindrical surface, second oblique grooves disposed in a second cylindrical zone spaced from the first cylindrical zone in an axial direction, and cross grooves (or generally X-shaped grooves) disposed in an intermediate cylindrical zone between the first and second cylindrical zones. The first oblique grooves are oblique in a direction with respect to a generating line of the cylindrical surface and the second oblique grooves are oblique in a direction opposite to the direction in which the first oblique grooves are oblique.

Abstract: A main bearing for an internal combustion engine includes a top half and a bottom half joined along edges to from a sleeve for surrounding a main bearing of a crankshaft. A pair straight recesses, parallel to the bearing axis and the joining edges, are disposed on an internal surface of the bottom half of the bearing so that oil can puddle there, capture debris, and prevent dry starts of the internal combustion engine. A separate set of oppositely angled grooves are disposed on the internal surface of the bottom half of the bearing and outside the pair of straight recesses. The first angled groove removes excess oil from the front or back of the bearing and the second angled groove returns sufficient oil to maintain adequate surface bearing lubrication.

Abstract: A hydrodynamic gas bearing includes a cantilevered shaft having a free end, a fixed end, and a communicating hole for communicating with a passage formed at an end surface of the free end of the shaft. A cover member is rotatably arranged around the shaft to cover a periphery of the shaft. One of an inner surface of the cover member which faces the fixed end of the shaft and an outer surface of the fixed end of the shaft has herringbone-configured hydrodynamic pressure generating grooves for preventing gas from being fed from a fixed end side to a free end side of the shaft. One of the inner surface of the cover member which faces the free end of the shaft and an outer surface of the free end of the shaft has helical-configured hydrodynamic pressure generating grooves for feeding gas from the free end side to the fixed end side of the shaft.

Abstract: A sliding bearing for an internal combustion engine; the sliding bearing having a groove formed substantially circumferentially on an inner circumferential face of the sliding bearing; the width of the groove being smaller than 0.6 mm, and the ratio of the width of the groove to depth of the groove being larger than 40.

Abstract: A bearing structure suitable for a spindle motor or the like, which enables such a motor to rotate with minimal vibrations. The bearing structure comprises a stator including a support shaft which is disposed on a base, and a rotor which is rotatably disposed around the support shaft. A radial hydrodynamic bearing and a thrust hydrodynamic bearing are disposed between the stator and the rotor. The stator has the support shaft, a thrust plate and a radial cylindrical member which is concentric with the support shaft. The thrust plate is secured to an end surface of the radial cylindrical member. The support shaft extends through the centers of the radial cylindrical member and the thrust plate. The rotor has a radial sleeve. The radial hydrodynamic bearing is formed from the inner peripheral surface of the radial sleeve and the outer peripheral surface of the radial cylindrical member, which face each other and either of which is formed with herringbone-shaped grooves for generating dynamic pressure.

Abstract: A bearing with dynamic pressure grooves includes an outer cylinder made of a metal and a resin sheet bonded to the inner peripheral surface of the outer cylinder. The resin sheet is made of a thermoplastic resin, for example, a polytetra fluoroethylene, as a main component mixed with a wear-resistant improving material, for example, graphite or the like. The resin sheet is formed with a pattern of dynamic pressure generating grooves formed in an inner surface by plastic work. The pattern of grooves is varied depending on the types of relative movement between the outer cylinder and a shaft body, i.e., whether an axial linear movement, a rotational movement, or a spiral movement.

Abstract: Elastic bearing comprising an inner bushing and an outer bushing located at some distance from it, and an elastic part inserted between them, whereby between the elastic part and at least one surface of one of the bushings, there is lubricant in a cavity, the bushings and elastic part being rotatable relative to one another. To increase the useful life and to guarantee correct lubrication, in the cavity the elastic part has elevations on its surface, which are arranged to guarantee a proper distribution of the lubricant.

Abstract: A hydrodynamic bearing system comprises a shaft, a sleeve rotatably fitted on the shaft and a thrust plate fixed to the sleeve and acting to support one end of the shaft in a thrust direction. First shallow grooves are formed in at least one of fitted surfaces of the shaft and of the sleeve to support one of the shaft and the sleeve with respect to the other in a radial direction, and a second shallow groove is formed in at least one of the shaft and the thrust plate with respect to the other in a thrust direction. The thrust plate is made of material including resin material as a main component and has an outside periphery portion with a thickness thicker than that of an inside periphery portion thereof.

Abstract: A dynamic pressure bearing device induced a housing having a sleeve and a thrust receiver and a shaft fit into the sleeve. Herringbone-shaped grooves for generating dynamic pressure comprising outer groove segments and inner group segments are disposed to at least one of the inner cylindrical surface of the sleeve and the outer cylindrical surface of the shaft at two axially spaced apart positions. The axial length of the outer groove segment is longer than that of the inner groove segment, and the difference of the axial length for the outer and the inner groove segments is greater in the lower herringbone-shaped grooves than in the upper herringbone-shaped grooves.

Abstract: A rotary machine for handling a fluid includes a housing having a rotor chamber and a rotor rotatably mounted in the chamber. The rotor has a plurality of generally radially disposed vane slots, and a plurality of vanes are slidably mounted in the vane slots and operable to define variable volume chambers for the fluid as the rotor rotates and the vanes move generally radially in and out of the vane slots. The vanes have projections projecting from the longitudinal ends thereof, and the housing has annular rings having inner cylindrical surfaces disposed to be engaged by projections. Grooves on the outer surface of the rings are operable to produce a layer of fluid between such outer surface and the housing to thereby minimize the frictional rotational resistance of the rings on the housing, the rings thereby being rotated in approximately synchronization with the rotor.

Abstract: A rotary machine for handling a fluid includes a housing having a rotor chamber and a rotor rotatably mounted in the rotor chamber. The rotor has a plurality of generally radially disposed vane slots and a plurality of vanes are slidably mounted in the vane slots and operable to define variable volume chambers as the rotor rotates and the vanes move generally radially in and out of the vane slots. Rotatable retainer plates are disposed between the housing and the longitudinal ends of the vanes, the retainer plates having stoppers extending axially into recesses in the vanes, the stoppers being operable to limit the extent of outward radial movement of the vanes to preclude sliding contact between the vanes and the inner peripheral surface of the rotor chamber.

Abstract: A vane pump in which a projection is provided on the end of a vane which radially slides as a rotor rotates, and an annular race concentric with an inner peripheral surface of a housing is provided in the inner surface of the end wall of the housing, the projection being brought into engagement with the annular race to control the slide of the vane.

Abstract: A hydrodynamic grooved bearing device in which a shaft is inserted into a hole formed in a bearing housing and one of the shaft and bearing housing is rotated, thereby the rotated member being supported includes a plurality of grooves formed on the shaft or an inner peripheral surface of the bearing housing for generating a dynamic pressure of fluid filled between the shaft and the bearing housing. The plurality of grooves are arranged side by side with a substantially certain pitch in a direction of rotation. Each of the grooves comprises a pair of groove portions slanted relative to the direction of rotation such that a distance between the pair of groove portions becomes narrower towards the direction of rotation and a connecting groove portion connecting the narrowest distance between the slanted groove portions. The connecting groove portion is extended in a direction substantially perpendicular to the direction of rotation.

Abstract: A roller element for a powered-roller tarnsfer system has a plurality of lubricant pressure relief areas about or in the bearing surface to increase and provide consistent rotary drive power transmitted from a powered axle to the roller.

Abstract: The invention relates to a process and a device for the production of drilling holes from an angled position with respect to the drilling axis, wherein the system has a free-moving drilling support with a drilling machine axially movable thereon. According to this process the drilling rod is provided with a flexible configuration that is diverted by passing through a bend guide affixed to a drilling support, from the rotation axis of the drilling machine to the axis of the drill hole. According to this device, the flexible drilling rod system consists of a tubular core and of wires or rods twisted around this core.

Abstract: A flexible line trimmer is provided with an automatic line feeding cutting head portion which utilizes a generally U-shaped, centrifugally actuated balancing arm member to maintain the free end cutting length of the line at a predetermined length during trimmer operation. The balancing arm is rotatably mounted within the head by means of a coil spring element which is installed on one of the leg portions of the balancing arm and press-fitted into a plastic pocket portion of the head to serve as a bearing for the balancing arm. The outer end of the spring-carrying leg has a transverse pigtail portion which may be selectively sized to predeterminably vary the controlled cutting length of the line. The opposite leg of the balancing arm, which is engaged by the line during trimmer operation, is received within spool flange notches when the arm is in its line locking position to prevent undesirable bending of the arm due to cutting line forces thereon.

Abstract: Improved blade-type, air dielectric switchgear apparatus is provided having spring loaded, fast acting, operator independent mechanism for selective opening and closing of internal switch contacts. Preferably, the operating mechanism includes a pair of opposed, pivotal, notched, scissor-like arms with a rotatable latch plate therebetween; a pair of latching pins are carried by the plate, and the latter is operably connected with a power spring assembly. A trip element is also provided which, upon rotation thereof in either a clockwise or counterclockwise direction, serves to shift a corresponding arm away from the latch plate to disengage the latching components. At this point a high velocity rotational movement is imparted to the latch plate by the spring assembly to rotate the latch plate to a second position wherein the plate and the opposed arm come into latching engagement.

Abstract: A scanning mechanism for a recording apparatus having a carriage for scanning with a bearing portion at which the carriage is engaged on a guide shaft, whereby a dynamic pressure bearing is used in the above-defined bearing portion, and a lubricant supply member is provided on the guide shaft in a position at which the carriage arrives selectively.

Abstract: A slitted tubular valve guide is provided with a substantially spiral groove along its entire length. At each point of intersection between the spiral groove and the slit, the ends of the groove segments immediately adjacent the slit are offset by an amount sufficient to create a discontinuity in the groove. The spiral groove is, therefore, divided into a number of inclined, decoupled groove segments incapable of flowing lubricating oil along their linear extent to the combustion chamber. The tubular valve guide is rolled from flat stock having inclined parallel groove segments preformed in the surface.

Abstract: A precision hydrodynamic bearing which has a rotatable shaft disposed in the bore of a housing to form an annular gap. The annular includes a journal zone for containing and pressurizing lubricant to facilitate low friction rotation of the shaft and to maintain the annular gap as the shaft rotates.

Abstract: A radial bearing comprising a cylindrical bearing member and a shaft arranged therein, the member and the shaft being rotatable with respect to each other and one of the cooperating bearing surfaces of the member and the shaft being provided with a pattern of shallow lubricant-pumping grooves which, during relative rotation between the member and the shaft, build up a pressure in a lubricant present between the shaft and the member. In one axial zone of the member or the shaft the relevant bearing surface is provided along one half of its circumference with a groove pattern which is arranged to pump in one circumferential direction, and along the other half of its circumference with an identical groove pattern which is arranged to pump in the opposite circumferential direction.

Abstract: A hydrostatic bearing 20 for a rotatable shaft 18 of the type in which lubricating fluid is fed through orifices 12 in the bearing to a plurality of recesses 14 and finally to a land 16. Land 16 comprises grooves 22 directed toward recesses 14 in the direction of the shaft's rotation so that lubricating fluid is pumped back toward recesses 14.

Abstract: A bearing and seal structure and a vertical slurry pump incorporating such bearing and seal are provided including a housing surrounding a shaft for submerged operation comprising a housing surrounding a shaft, a rotatable sleeve removably fixed on said shaft and rotating therewith in said housing, a stationary sleeve fixed in said housing surrounding and in bearing contact with said rotatable sleeve, passage means in said housing and stationary sleeve carrying lubricant to the interior of the stationary sleeve in contact with the rotatable sleeve and a continuous pressure lubricant source supplying continuous lubrication to said passage means and between the rotatable and stationary sleeves.

Abstract: The invention relates to a magnetic-tape-cassette apparatus comprising at least one capstan (6a, 6b) which in conjunction with a pressure roller (4a, 4b) drives the magnetic tape (12). The capstan is journalled in a bearing (19) which is mounted in a deck plate (15) of the apparatus by means of a lower sleeve part (18). The lower part (18) is formed with a bore through which the capstan extends and adjoins an upper sleeve part (17) which at least at the capstan side which is remote from the pressure roller (4a, 4b) surrounds the capstan (6a, 6b) above the deck plate (15), to strip off the tape. The lower part (18) and the upper part (17) are formed in one piece of a plastics material. The bearing (19) is formed as a spiral-groove bearing in the inner wall (18a) of the bore in the lower sleeve part.

Abstract: In order to prevent the escape of metal lubricant in a helical-groove bearing, the helical-groove bearing is provided with an anti-wetting layer on the surfaces which adjoin the helically grooved surfaces and which could act as a creepage path for the metal lubricant. An extremely accurate definition of the bearing portions to be wetted by the lubricant is also obtained by means of these layers. Thus, more complex bearings can also be locally provided with a metal lubricant.

Abstract: The invention provides a radial friction bearing assembly, particularly for rotatably mounting the rolls of a paper or textile material processing machine, which will give a stable rotational movement without any vibrations and ensures that always an uninterrupted lubrication film is available, even at very low rotational speeds. A preferred embodiment of the bearing assembly comprises a stationary shaft member and an annular sleeve member rotatably mounted on the shaft member. The latter one comprises on its outer surface a plurality of equidistantially arranged longitudinal grooves which extend parallelly to the axis of the shaft member. A plurality of trapezoidally shaped recesses or pockets, having a substantially smaller depth than the longitudinal grooves, extend from and communicate with said grooves, the base edge of the trapezoid adjoining the leading edge of the longitudinal grooves.

Abstract: A friction bearing assembly for a roller cutter drill bit, comprising a first bearing member of cylindrical configuration and a second bearing member having an opening of generally circular section therein receiving the first member for enabling relative rotation of the members. A bushing is fitted between the bearing members, the bushing being of annular configuration and having an inner and an outer diameter so related to the diameter of the first bearing member and the diameter of the opening in the second bearing member as to enable the bushing to rotate relative to both members. The bushing is of width substantially greater than its thickness, and comprises a plurality of relatively thin, narrow elongate metal members, each metal member being of generally circular configuration and constituting a ring.

Abstract: In accordance with an illustrative embodiment of the present invention, a bearing positioned between the rolling cutter or cone and the bearing pin of a rock bit comprises wound wire such as a closed helical coil spring that provides spaced-apart bearing surfaces with open areas therebetween. The flexibility of the helical spring tends to spread the load between several bearing areas to thereby reduce concentrations of stress and the occurrence of localized high temperatures and wear, and the spacing of the bearing surfaces provides wear and contamination particle traps as well as lubricant reservoirs, to significantly increase the useful life of the bearing.