Bearing-surface Treatment Patents (Class 384/625)
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Patent number: 5507580Abstract: The ball raceways on the inside surface of the outer ring of a rod end bearing to be used on aircraft is hardened by a nitriding process while at the same time leaving the remainder of the ring soft and ductile to resist fracture.Type: GrantFiled: December 16, 1994Date of Patent: April 16, 1996Assignee: The Torrington CompanyInventors: Michael M. Dezzani, Philip K. Pearson
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Patent number: 5498086Abstract: This invention relates to an oil film-deposit bearing, the oil film-deposit bearing being composed of an outer ring, an inner ring and a plurality of rolling means, the inner circumference of the outer ring and the inner ring having respectively an arc groove, on the surface of the arc grooves having a plurality of capillary holes, the rolling means being installed between the arc grooves of the outer ring and the inner ring and can roll between them, on the outer surface of the rolling means having a plurality of capillary holes, the oil or grease added on the contacting surface between the rolling means and the arc grooves would deposit in these capillary holes, once the oil film-deposit bearing rotating with shaft, the oil or grease deposited in the capillary holes would flow out to form an oil film on the contacting surface between the rolling means and the arc grooves, thus the oil film-deposit bearing can lubricate itself and prevent the oil or grease from throwing out in high speed rotation.Type: GrantFiled: January 31, 1995Date of Patent: March 12, 1996Inventor: Chin-Sung Ou
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Patent number: 5482382Abstract: A thrust ball bearing in which the lives of a power roller and an outer ring can be ensured without increasing a rotational resistance. The thrust ball bearing can thus be improved in durability without impairing the performance of a toroidal type continuously variable transmission having such a thrust ball bearing built thereinto. Fracture toughness K.sub.1c of a material forming the power roller is made higher than fracture toughness K.sub.1c ' of a material forming the outer ring (K.sub.1c >K.sub.1c '). Further, the maximum contact surface pressure P.sub.max between an inner ring raceway and the respective balls is made smaller than the maximum contact surface pressure P.sub.max ' between an outer ring raceway and the respective balls (P.sub.max <P.sub.max ').Type: GrantFiled: March 8, 1995Date of Patent: January 9, 1996Assignee: NSK Ltd.Inventors: Takanobu Sato, Hirotoshi Takata, Ryo Goino
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Patent number: 5456538Abstract: The surface roughness of the rolling surface 2 of the roller 1 along both the axial and circumferential direction is 0.06 .mu.m RA or less, while the surface roughness of the opposing inner ring raceway 4 is 0.08 to 0.15 .mu.m Ra along the axial direction, and 0.04 or less along the circumferential direction, whereby the heat generated by the roller bearing is kept to a minimum, and the danger of burning of the roller bearing is reduced.Type: GrantFiled: August 4, 1994Date of Patent: October 10, 1995Assignee: NSK Ltd.Inventors: Toshiharu Honda, Hiroshi Iwasa, Moichi Chiba, Yasuo Murakami, Toshiyuki Yamamoto, Yasuyuki Shimazaki
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Patent number: 5439300Abstract: An object of this invention is to provide a rolling bearing having an inner race which can be used under a high fitting stress over 130 MPa, and can be processed more quickly than the conventional one. In a rolling bearing, according to the present invention, including an inner race which is used with a fitting stress applied between bore of said inner race and shaft, the inner race is formed by an alloy steel whose carbon content is ranged from 0.3 to 0.7% by weight, the inner race is subjected to a carburizing or carbonitriding treatment, and the carbon content (C.sub.1) of the surface layer of the raceway track of the inner race is at most 1.3% by weight, and the inner race has the difference (.DELTA.C=C.sub.1 -C.sub.2) between the carbon content (C.sub.1) of the surface layer and the carbon content (C.sub.2) of the core of the inner race being at least 0.4% by weight. When the amount of residual austenite of the inner race is 4.Type: GrantFiled: February 28, 1994Date of Patent: August 8, 1995Assignee: NSK Ltd.Inventors: Kiyoshi Hirakawa, Toichi Kondo, Shigeru Okita
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Patent number: 5433531Abstract: A dispersion of hard, wear-resistant particles such as aluminum oxide is embedded within a shaft-engaging surface of a bearing such that the service life of a shaft and bearing assembly is extended. The relatively hard aluminum oxide particles exert a polishing action on the shaft surface to improve the wear resistance and seizure resistance of the bearing and shaft system. A tumbling barrel, vibratory bowl, air jet, brush or similar apparatus can be used to apply and embed tumbling media particles within the shaft-engaging surface. During the application period, aluminum oxide particles are transferred to the bearing member surfaces by the sliding, rubbing contact between the abrasive bodies and the individual bearing members.Type: GrantFiled: September 21, 1993Date of Patent: July 18, 1995Assignee: Federal-Mogul CorporationInventor: Ronald J. Thompson
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Patent number: 5426988Abstract: A device for reciprocating a plunger according to the present invention comprises: an electric motor; a drive shaft rotated by the electric motor; an inner race fixedly mounted on the drive shaft, the inner race having an inner race track which is formed on the outer cylindrical surface of the inner race in such a manner that the inner trace track is not coaxial with the inner cylindrical surface of the inner race and the drive shaft; an outer race provided around the inner race, the outer race having an outer race track which is coaxial with the inner race track; a plurality of rolling members provided between the outer race track and the inner race track; and a plunger member movably supported in an axial direction thereof, one end of the plunger member being elastically abutted against the outer cylindrical surface of the outer race. According to the present invention, it is possible to make a manufacturing cost lower, to make the whole of the device smaller in weight, and to make a quality higher.Type: GrantFiled: January 14, 1993Date of Patent: June 27, 1995Assignee: NSK Ltd.Inventors: Toshihisa Ohata, Takayuki Yatabe
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Patent number: 5415258Abstract: In a one-way clutch, an outer ring has an internal portion whose hardness is substantially the same as that of its periphery, both hardnesses preferably being HRC 55 or more. When sprags interposed between the outer ring and inner ring are engaged with an inner peripheral surface of the outer ring and press the inner peripheral surface radially outwardly, the internal portion having the hardness of HRC 55 or more backs up the inner peripheral surface to prevent the inner peripheral surface from being deformed radially outwardly. Therefore, "roll-over" can be prevented and the maximum transmission torque is increased.Type: GrantFiled: September 21, 1993Date of Patent: May 16, 1995Assignee: Koyo Seiko Co., Ltd.Inventor: Tetsuaki Numata
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Patent number: 5397188Abstract: A rolling member which has improved strength and permits stable formation of oil films between its rolling surface and its mating surface and which shows a long life even under unfavorable lubricating conditions. The surface of the rolling member is subjected to heat treatment while nitriding. The rolling member is then treated to form minute recesses in its surface so that such surface has a surface roughness parameter RMS of not less than 0.10 .mu.m and a negative SK value. Thus, the surface strength of the rolling element increases and the oil film forming rate improves. The surface of the rolling member is less likely to suffer peeling damage and wear. Its life is prolonged.Type: GrantFiled: August 25, 1993Date of Patent: March 14, 1995Assignee: NTN CorporationInventors: Noriyoshi Yoshizuka, Yoshinobu Akamatsu, Kazuyoshi Harimoto
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Patent number: 5387461Abstract: To enhance the seizure resistance of sliding bearing material which has a layer (4) of aluminum-oxide (1) on the surface of the lining (5) consisting of aluminum-alloy bearing, the layer (4) consists of mixed phase of aluminum oxide (1) and tin oxide (2).Type: GrantFiled: July 28, 1992Date of Patent: February 7, 1995Assignee: Taiho Kogyo Co., Ltd.Inventors: Soji Kamiya, Yuji Yokota
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Patent number: 5352046Abstract: A rolling element bearing includes a first ring having a first raceway; a second ring having a second raceway, and rolling elements between the two raceways. The first and second rings are positioned and configured so that the first and second raceways form a channel which retains the rolling elements. A first zinc alloy plated layer is on the first ring including at the first raceway, and a second zinc alloy plated layer is on the second ring including at the second raceway. The rolling elements may also be plated with a zinc alloy layer. The layers are porous and thus permit hydrogen to escape from the rings and rolling elements when baked, so that the rings and rolling elements possess low hydrogen embrittlement. The layers provide physical and galvanic protection to the underlying substrates for the rings.Type: GrantFiled: July 31, 1992Date of Patent: October 4, 1994Assignee: MPB CorporationInventor: Peter C. Ward
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Patent number: 5352541Abstract: An aluminum bearing alloy sliding member excellent in anti-seizure property, of which sliding surface is coated with a film of aluminum fluoride or manganese phosphate formed by a chemical conversion process and having a thickness ranging from 0.1 .mu.m to 10 .mu.m.Type: GrantFiled: September 23, 1992Date of Patent: October 4, 1994Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Tsukimitsu Higuchi
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Patent number: 5352303Abstract: An object of this invention is to provide a rolling bearing which is increased in rolling fatigue life when used with a lubricant contaminated by foreign matters, and which is improved in wear resistance and in seizure resistance. In a rolling bearing, at least one of the inner race, outer race and rolling elements thereof is made of an alloy steel which contains 0.10 to 1.0 wt of C, 0.50 to 3.0 wt % of Cr, 0.10 to 2.0 wt % of Mo, 0.15 to 1.0 wt % of Si, 0.20 to 1.5 wt % of Mn, and 0.2 to 1.0 wt % of Ni, and which is carbo-nitrided so that the sum (C+N) of the contents of carbon (C) and nitrogen (N) in the surface layer thereof is 1.0 to 2.0%, and the ratio (N/C) of the content of nitrogen (N) to the content of carbon (C) is 0.8 to 2.0.Type: GrantFiled: November 24, 1993Date of Patent: October 4, 1994Assignee: NSK Ltd.Inventors: Yasuo Murakami, Yasuo Utsumi, Toichi Kondou
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Patent number: 5333954Abstract: A part with excellent wear resistance when subjected to both sliding friction and rolling friction has a layer in the range from 0 to 50 microns beneath the surface with a maximum compressive residual stress of at least 90 kgf/mm.sup.2, and a hardness of at least Hv 780. The average radius of curvature of tips of minute protrusions existing on the surface is made at least 90 microns.Type: GrantFiled: April 5, 1993Date of Patent: August 2, 1994Assignee: NSK Ltd.Inventors: Shoji Noguchi, Satoru Aihara
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Patent number: 5322735Abstract: A roller body or plain bearing component exhibits a core body (1) of ceramic material which is coated with a lapped hard layer (3) (e.g. titanium carbide, Diamond . . . ).Type: GrantFiled: September 7, 1993Date of Patent: June 21, 1994Assignee: Saphirwerk Industrieprodukte AGInventors: Jean-Daniel Fridez, Georges W. Keller
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Patent number: 5322370Abstract: Linear sliding guides with rolling elements for translating couplings or the like, which include by a pair of contoured elements suitable for being fitted one with the other wherein rolling elements are interposed between the contoured elements, and wherein both of the contoured elements are provided with seats for at least partially housing the rolling elements. The rolling elements are retained by an intermediate cage element. Inside the seats the contoured elements have at least one mutually opposite face treated by high-thickness hard anodizing. The rolling elements are made of a plastic material and the contoured elements are manufactured from an extruded light alloy material.Type: GrantFiled: January 25, 1993Date of Patent: June 21, 1994Assignee: T.M.T. Transmissioni Meccaniche Torino S.R.L.Inventor: Fiorenzo Gallone
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Patent number: 5292200Abstract: At least one of the inner race, the outer race and rolling elements in the improved ball-and-roller bearing is made of an alloy steel that contains 0.1-1.2 wt % of C, 3.0-18.0 wt % of Cr, 0.01-1.5 wt % of Si, 0.3-1.5 wt % of Mn, up to 2.5 wt % of Mo, up to 0.002 wt % of O.sub.2 and up to 0.015 wt % of S and which is subjected to plasma-assisted carburization to such an extent that the relative surface carbon area is at least 15% the surface carbon concentration is in the range of 1.6-3.5 wt % and the amount of surface retained austenite is in the rang of 20 vol %-45 vol %. The bearing can work effectively for a prolonged lifetime even if it is placed under hostile conditions as exemplified by an increased areal pressure of load and entrance of foreign matter into lubricating oils.Type: GrantFiled: June 28, 1993Date of Patent: March 8, 1994Assignee: NSK Ltd.Inventors: Yoichi Matsumoto, Kenji Yamamura, Kousuke Nonaka
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Patent number: 5290070Abstract: The carriage guides for head disk actuator assemblies of the present invention include bearings and guide rails which reduce the problems associated with the wear between the bearings and rails. The bearings and guide rails of the present invention have nitrided outer contact surfaces with improved wear characteristics while the inner surfaces are not affected. Further, the bearings have radiused outer edges to reduce the point contact caused by misalignment between the bearings and the rails. The apparatus of the present invention is manufactured using an electro-polishing process to remove the amounts of embedded non-metallic surface contaminants present on the outside surface of the bearings.Type: GrantFiled: January 14, 1992Date of Patent: March 1, 1994Assignee: Storage Technology CorporationInventors: Scott H. Deits, Gary T. Krech, Robert D. Turner, Ronald B. Warner
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Patent number: 5255592Abstract: A wrist pin is provided for connecting a connecting rod to a piston, comprising a cylindrical aluminum pin having an outer cylindrical surface, the pin being matingly insertable into a bore of a piston, the outer cylindrical surface having an anodized coating applied thereto. A process for manufacturing a wrist pin is also provided, comprising the steps of machining a cylindrical pin, having an outer cylindrical surface, from aluminum stock; and applying an anodized coating to the outer cylindrical surface. The preferred anodized coating comprises a hardcoat anodized coating.Type: GrantFiled: February 5, 1992Date of Patent: October 26, 1993Assignee: W. A. Thomas Co.Inventor: Arthur J. Lewis, Jr.
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Patent number: 5249868Abstract: The invention relates to a track bushing having an outer peripheral surface, an inner peripheral surface, a longitudinal bore, first and second end portions, and a center portion. The outer peripheral surface and the inner end portions have a preselected hardness greater than the center portion.Type: GrantFiled: January 27, 1993Date of Patent: October 5, 1993Assignee: Caterpillar Inc.Inventor: Kenneth R. Watts
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Patent number: 5150974Abstract: The grease-sealed bearing is formed on rolling surfaces (4) of rings (2, 2) of the bearing (1) with oxide layers (5) having a thickness of 0.1-2.5 microns, the development of peculiar peeling on the rolling surfaces of the bearing can be prevented. If it is used as a bearing for an alternator or the like, its duration can be increased.Type: GrantFiled: September 10, 1990Date of Patent: September 29, 1992Assignee: NTN CorporationInventors: Kenji Tamada, Hirokazu Nakajima, Akio Okayama, Takahiro Mizutani
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Patent number: 5122000Abstract: A rolling bearing in which a bearing ring and/or a rolling element comprises an alloy steel wherein the hardness of a surface layer over a thickness corresponding to greater than 2% of a mean diameter of a rolling element is equal to or greater than 60 HRC and the hardness at least of the raceway surface or the rolling contact surface is equal to or greater than 64 and equal to or less than 69 HRC, and carbides of equal to or greater than 6 .mu.m converted as the diameter of a circle are not contained in a range from the raceway surface of the rolling contact surface as far as the depth corresponding to 2% of the mean diameter of the rolling element.Type: GrantFiled: April 24, 1991Date of Patent: June 16, 1992Assignee: Nippon Seiko Kabushiki KaishaInventors: Yoichi Matsumoto, Yasuo Utsumi
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Patent number: 5116144Abstract: In a plane bearing comprising a lining having first concavities on the surface thereof, and an overlay formed on the bonding layer, the seizure resistance of the bearing with worn overlay is enhanced by determining the first length of first concavities as seen in a direction perpendicular to a sliding direction non-equal to the second length of said first concavities as seen in the sliding direction.Type: GrantFiled: September 9, 1991Date of Patent: May 26, 1992Assignee: Taiho Kogyo Co., Ltd.Inventors: Soji Kamiya, Yuji Yokota
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Patent number: 5087132Abstract: A method for manufacturing a resin impregnated cloth bearing surface wherein the resin impregnated cloth is deaerated to reduce air bubbles in the finished bearing.Type: GrantFiled: January 4, 1991Date of Patent: February 11, 1992Assignee: Tsubakimoto Chain CompanyInventors: Kouji Tanaka, Masaaki Ikeda, Yasumasa Tsubakimoto, Takashi Koizumi, Takerou Nakagawa, Makato Kanehira
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Patent number: 5084116Abstract: A rolling contact element steel has C: 0.2-0.6 wt %; Si: 0.5-2.0 wt %; Cr: 5.0-8.0 wt %; Mo: 3.0 wt % or less; Mn: 1.6 wt % or less; O: 12 ppm or less; and the balance of Fe and an inevitable impurity. A rolling bearing made of this steel will not soften even at high temperature. The dimensional stability at high temperature and wear-resistance of the steel are superior. The steel can produce a fine carbide without the need for a separate heat treatment. A rolling bearing has at least one of the races and the rolling element made of the steel, the steel being carburized or carbonitrided, then quenched and finally high-temperature tempered.Type: GrantFiled: July 31, 1990Date of Patent: January 28, 1992Assignee: Nippon Seiko Kabushiki KaishaInventor: Nobuaki Mitamura
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Patent number: 5064298Abstract: A machine part having a rolling or sliding surface formed with a plurality of minute recesses at random with the SK value less than zero in both the longitudinal and circumferential directions, and the area ratio of the recesses to the whole rolling surface being 10-40 percent.Type: GrantFiled: November 29, 1990Date of Patent: November 12, 1991Assignee: NTN CorporationInventors: Kenji Hibi, Toshihide Goto
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Patent number: 5038640Abstract: An improved hardfacing composition and method are shown for use in manufacturing an earth boring bit. The hardfacing composition is formed by combining titanium carbide with a hard-metal alloy of the iron or cobalt family. The hardfacing composition is then applied to the friction bearing surface of the rock bit.Type: GrantFiled: February 8, 1990Date of Patent: August 13, 1991Assignee: Hughes Tool CompanyInventors: Eric C. Sullivan, Louis H. Barnard
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Patent number: 5030017Abstract: A rolling bearing has races and a rolling element. At least one of the races and the rolling element is made of a carburized or carbonitrided alloy steel. The content of a fine carbide present in the surface layer of the one element of the rolling bearing is 20-50 vol %. The content of retained austenite in the surface layer is 10-25 vol %. The rolling bearing provides a long-life rolling bearing suitable for use in a transmission and engine.Type: GrantFiled: July 24, 1990Date of Patent: July 9, 1991Assignee: Nippon Seiko Kabushiki KaishaInventors: Yasuo Murakami, Nobuaki Mitamura
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Patent number: 5019738Abstract: A self-pressurizing gas supported bearing includes a cylindrical bearing sleeve having a longitudinal axis and a cylindrical inner surface forming a first bearing surface with a random surface texture having a first R.sub.a roughness profile. A cylindrical bearing shaft is positioned coaxially within the bearing sleeve and includes a cylindrical outer surface forming a second bearing surface with a random surface texture having a second R.sub.a roughness profile. The sum of the first and second R.sub.a roughness profiles falls within the range of from about eighteen to sixty. A drive system establishes a relative rotational velocity between the bearing sleeve and the bearing shaft, generating a bearing stiffness force which causes the overlapping bearing surfaces to lift off and break contact. The bearing sleeve and shaft are dimensioned to maintain a predetermined means spacing between the sleeve and shaft. The bearing may also take the form of a linear bearing or other cylindrical configurations.Type: GrantFiled: July 16, 1990Date of Patent: May 28, 1991Assignee: Lincoln Laser CompanyInventors: August O. Weilbach, Derald F. Hanson, C. Dwight Smith
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Patent number: 5017095Abstract: A bearing comprising a body of polymeric material and a reinforcing member embedded in the body and having a plurality of perforations throughout which are affixed in the reinforcing member. The polymeric material extends through the perforations. The bearing may have various configurations. The reinforcing member may comprise a thin metal sheet having perforations therein, a woven metal body defining the perforations, or adjacent woven metal bodies each having perforations. In one form, a backing member is adhered to on one side of said reinforcing member. Where a thin metal sheet is used, it has a roughened surface finish at the interface with the plastic body.Type: GrantFiled: July 17, 1989Date of Patent: May 21, 1991Assignee: Vickers, IncorporatedInventors: Roy T. Burgess, Gregory P. Campau, Leslie M. Claar, Robert C. Hodges, Douglas G. Snow, Roy Taylor
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Patent number: 5004357Abstract: A bearing part for a gas bearing comprising two bearing parts, said bearing part formed of a granite-like or metal substance with pores or gas leakage channels and means for injecting a gas between the bearing parts (2, 3) for forming a gap (7) therebetween. The pores (10) in the surfaces of the granite material of these bearing parts are sealed by a non-brittle, transparent, mechanically, machinable pore sealing material (9, 12) for forming gas bearing parts having a non-porous surface. Examples of pore sealing materials (9, 12) for sealing the pores of the bearing parts and bearing part material are polyurethanes, acrylic polymers, epoxy resins, silicone resins, polyvinylidenefluoride resins, aramide resins etc. Preferably the pore sealing material consists of a polymer being curable at low temperatures, particularly below 30.degree. C.Type: GrantFiled: August 10, 1989Date of Patent: April 2, 1991Assignee: Pelt & Hooykas B.V.Inventor: Hooykaas, Carel W. J.
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Patent number: 4973172Abstract: A product for use in a power train such as a bearing assembly, a reducer, a coupling or the like and which is suitable for use in a wet or harsh chemical environment including a housing, exterior surfaces of said housing having tough, durable coatings of fluorocarbon polymers to render same resistant to corrosion or chemical attack during usage in the food and chemical industry, and the method of making the same. A first polymer is present in a thickness of from about 0.5 to about 0.8 mill and exhibits thermoset characteristics for bonding to the housing. A second polymer is applied over the first polymer on all exterior surfaces to be protected in a thickness of up to about 4.0 mils and is bondable to said first polymer coating.Type: GrantFiled: March 29, 1990Date of Patent: November 27, 1990Assignee: Reliance Electric Industrial CompanyInventors: Donald L. Nisley, Randall H. Alvis
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Patent number: 4973068Abstract: This invention relates to a dynamic seal or bearing interface having areas with different roughnesses. The different surface areas both provide asperity tip load support for the opposing interface.Type: GrantFiled: May 26, 1989Date of Patent: November 27, 1990Assignee: University of New MexicoInventor: Alan O. Lebeck
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Patent number: 4956858Abstract: A method of applying solid lubricant to a bearing with rolling surfaces which comprises the steps of sputter cleaning the bearing substrate and implanting ions of the solid lubricant to a shallow depth in the surface of the substrate to improve the bonding of the solid lubricant plating which is subsequently deposited by plasma-assisted ion plating in a thin layer of approximately 1000 .ANG. directly over the implanted substrate and wherein the plating is applied to the bearing substrate at high temperature and in the presence of low pressure inert gas ions to improve surface structure and wherein the bearing element is then cooled in a vacuum.Type: GrantFiled: February 21, 1989Date of Patent: September 11, 1990Assignee: General Electric CompanyInventor: Kamleshwar Upadhya
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Patent number: 4953989Abstract: A gas bearing part is provided, having gas supply means which open out into a recessed working surface which can be placed opposite a carrier plate to permit formation of a gas bearing relative to the carrier plate.To obtain a friction-free movement, also with application of higher gas pressures the roughness of the working surface is less than 10 ru, preferably less than 4 ru. The working surface is further essentially conically recessed, whereby the tip of the conical recess is essentially in the centre of the surface.Type: GrantFiled: January 26, 1989Date of Patent: September 4, 1990Assignee: Pelt & Hooykaas B.V.Inventor: Carel W. J. Hooykaas
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Patent number: 4930909Abstract: A rolling bearing having an inner ring, outer ring and rolling element, at least one of these elements being made of one of the following first, second or third medium-carbon manganese steels. The first medium-carbon manganese steel includes C: 0.4 to 0.7 wt. %, Si: 0.15 to 1.2 wt. %, Mn: 1.2 to 1.7 wt. %, Al: 200 to 300 ppm, Ti: up to 40 ppm, N: 100 to 200 ppm, S: up to 80 ppm, O: 9 ppm and the balance of Fe. The second steel includes at least one of Nb: 0.03 to 0.08 wt. % and V: 0.1 to 0.15 wt. % in addition to the elements of the first medium-carbon manganese steel. The third medium-carbon manganese steel includes at least one of Nb: 0.03 to 0.08 wt. % and V: 0.1 to 0.15 wt. % instead of Al and N and includes the other elements of the first medium-carbon manganese steel. Each medium-carbon manganese steel is subject to carburizing or carbo-nitriding so as to include a case with a 25 to 45 vol. % retained austenite.Type: GrantFiled: July 7, 1989Date of Patent: June 5, 1990Assignee: Nippon Seiko Kabushiki KaishaInventors: Yasuo Murakami, Youichi Matsumoto, Kazuhiro Uemura
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Patent number: 4916981Abstract: A hollow roller which comprises a hardened outer surface, and a non-hardened inner surface which has not been subjected to carburization process, whereby soft portions remain at the inner surface of the hollow roller in order to prevent the inner surface from being cracked in response to external shock. Preferably, the hollow roller is applied to a planet roller or a cylindrical roller.Type: GrantFiled: November 18, 1988Date of Patent: April 17, 1990Assignee: Koyo Seiko Co., Ltd.Inventors: Keiji Suzuki, Kouichi Ueda
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Patent number: 4904094Abstract: A rolling bearing, comprising an inner race, an outer race and rolling members which roll therebetween, at least one of the inner and outer races being subjected to carburizing and heating treatment, is characterized in that:the one race comprises a carbon steel containing 0.1 to 0.7 wt. % of carbon, with the residual austenite content on the track surface layer being 20 to 45 vol. % and the rolling members comprise a carbon steel containing 0.7 to 1.1 wt. % of carbon having carbonitriding and heating treatment applied on the surface layer, with the residual austenite content in such surface layer being 20 to 45 vol. % and the carbonitride in such surface being 3 to 15 vol. %.In another form of the bearing, the rolling members may comprise a carbon steel containing 0.1 to 0.7 wt. % of carbon, with the surface layers thereof being subjected to carburizing and heating treatment and having a residual austenite content of 20 to 45 vol. %.Type: GrantFiled: July 29, 1988Date of Patent: February 27, 1990Assignee: Nippon Seiko Kabushiki KaishaInventors: Kyozaburo Furumura, Yasuo Murakami, Youichi Matsumoto, Kenji Takei, Takaaki Shiratani, Soji Nishida
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Patent number: 4878768Abstract: Disclosed is a bearing having an improved corrosion resistance, which comprises: a base metal; and, a bearing layer of Cu-series alloy having a skeleton structure of Cu alloy. The clearance of the skeleton structure are filled essentially with Pb-containing phase. The deterioration of corrosion resistance due to dissolution of Pb in the clearances into degraded engine oil is prevented by including into the Pb-containing phase In at a depth exceeding approximately 20 .mu.m mearued from the surface of the bearing layer.Type: GrantFiled: August 4, 1988Date of Patent: November 7, 1989Assignee: Taiho Kogyo, Ltd.Inventors: Tatsuhiko Fukuoka, Takashi Suzuki
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Patent number: 4862789Abstract: A variable speed pressure energy translating device including a plurality of axially extending pistons and associated cylinders and a yoke engaged by the pistons and pivoted on a transverse axis for varying the displacement thereof, and a housing having spaced saddle bearing seats. The yoke has spaced complementary saddle bearing engaging portions and an arcuate bearing is seated in each of said seats. Each bearing comprises an arcuate body of polymeric material and an arcuate reinforcing member embedded in the body and having a plurality of perforations throughout which are fixed in the reinforcing member with the polymeric material extending through said perforations.Type: GrantFiled: February 1, 1988Date of Patent: September 5, 1989Assignee: Vickers, IncorporatedInventors: Roy T. Burgess, Gregory P. Campau, Leslie M. Claar, Robert C. Hodges, Douglas G. Snow, Roy Taylor
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Patent number: 4848934Abstract: A combination of a sliding-contact race (12) and bearing (10) in which a generally ring-shaped race member (12) and a generally ring-shaped bearing member (10) are fitted for relative sliding-rotation, the bearing member being within the race member. One of the members is comprised substantially of copper and the other of the members is comprised substantially of titanium. The members (10, 12) have lubricated contact surfaces (16, 18) for sliding-rotation, the member being comprised substantially of titanium having its lubricated contact surface being coated with chromium oxide (16).Type: GrantFiled: January 11, 1985Date of Patent: July 18, 1989Assignee: The Boeing CompanyInventors: Lawrence A. Blakely, Rodney R. Boyer, Lawrence B. Dalzell
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Patent number: 4838710Abstract: A static pressure gas bearing assemby having a gaseous fluid discharging bearing member for supporting a shaft by the discharged gaseous fluid is disclosed. The bearing member is made of porous graphite. For the manufacture, carbon particles approximately 80% of which have particle diameters not greater than approx. 40 microns, more particularly, particle diameters ranging from 1-20 microns are used. The carbon particles are subjected to molding, calcination and graphitization, whereby a porous graphite member having pores distributed substantially uniformly is obtained. In another aspect of the invention, the bearing member is made of a porous graphite material having a specific degree of swelling. Also, in another aspect, the surface of the shaft to be supported by the bearing member is coated with titanium nitride by ion plating treatment. In this manner, a high-precision and high-prerformance bearing assembly can be provided with reduced manufacturing costs.Type: GrantFiled: September 29, 1987Date of Patent: June 13, 1989Assignee: Canon Kabushiki KaishaInventors: Jiro Ohta, Sadamu Tozawa, Koichi Matsushita, Yutaka Maruyama
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Patent number: 4834400Abstract: A dynamic seal or bearing interface having areas with different roughnesses. The different surface areas both provide asperity tip load support for the opposing interface.Type: GrantFiled: March 15, 1988Date of Patent: May 30, 1989Assignee: University of New MexicoInventor: Alan O. Lebeck
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Patent number: 4824262Abstract: An unlubricated sliding member composed of a pair of sliding bodies. The sliding part of one sliding body is composed of a ceramic base portion and a thin film of, for example, Nb, which is integrally provided on the surface of the base portion. The sliding part of the other sliding body is composed of a diamond containing surface.The sliding member enables the coefficient of the friction caused when the pair of sliding bodies slide to be reduced, thereby keeping a long life of the sliding member.If the ceramic base portion is further subjected to ion implantation, the wear resistance of the sliding member is enhanced.Type: GrantFiled: September 25, 1987Date of Patent: April 25, 1989Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Osami Kamigaito, Haruo Doi, Shoji Noda, Masao Kouzaki
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Patent number: 4813795Abstract: The outer ring of the support roller mounted on an anti-friction bearing of a rolling mill has a soft core that is case hardened on its inner bore surface and on its outer peripheral surface, while not being case hardened at its axial end face sides, so that the outer ring will retain a cylindrical shape both for the inner bore surface, which rides on the rollers of the bearing, and the outer peripheral surface which supports the roll in a rolling mill.Type: GrantFiled: June 22, 1988Date of Patent: March 21, 1989Assignee: FAG Kugelfischer Georg Schafer (KGaA)Inventors: Oswald Bayer, Martin Grehn
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Patent number: 4741629Abstract: A gas bearing (1) comprising two bearing parts (2, 3) of granite type material and similar natural stone materials and means for injecting a gas between the bearing parts (2, 3) for forming a gap (7, 11) therebetween. The pores (10) in the surfaces of the granite material of these bearing parts are sealed by a non-brittle, transparent, mechanically, machinable pore sealing material (9, 12) for forming gas bearing parts having a non-porous surface. Examples of pore sealing materials (9, 12) for sealing the pores of the bearing parts and bearing part material are polyurethanes, acrylic polymers, epoxy resins, silicone resins, polyvinylidenefluoride resins, aramide resins etc. Preferably the pore sealing material consists of a polymer being curable at low temperatures, particularly below 30.degree.C.Type: GrantFiled: September 17, 1986Date of Patent: May 3, 1988Assignee: Pelt & Hooykaas B.V.Inventor: Carel W. J. Hooykaas
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Patent number: 4735862Abstract: A gas bearing is formed of a bearing member of sintered material. Sintered grains of a layer forming a desired bearing surface are deformed into the shape of a honeycomb in non-cutting fashion and are subsequently finely worked in cutting fashion, so that super-fine pores formed at corners of the honeycomb arise and which form nozzles.Type: GrantFiled: May 5, 1987Date of Patent: April 5, 1988Assignee: Dr.-Ing. Rudolf Hell GmbHInventors: Joachim Heinzl, Manfred Lehmann, Hans Zehentbauer
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Patent number: 4696581Abstract: An improved rolling bearing is proposed which has a longer life under heavy load and under lubrication with oil containing foreign matters. Its bearing rings and rolling elements are made of carburized steel having an oxygen content of 15 PPM or less and have a deeper surface hardened layer and a higher core hardness. It has a longer life even under lubrication with oil containing foreign matters.Type: GrantFiled: December 2, 1986Date of Patent: September 29, 1987Assignee: NTN Toyo Bearing Co., Ltd.Inventors: Noriyuki Tsushima, Hirokazu Nakajima
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Patent number: 4666318Abstract: A bearing, such as a plain spherical self-aligning bearing, has a reinforced low-friction woven plastics element (for example comprising ptfe) which is in sliding contact with a very hard, very smooth counterface. The bearing exhibits reduced wear when subjected to low-stress, small-amplitude motions.Type: GrantFiled: August 21, 1985Date of Patent: May 19, 1987Assignee: Ampep, plcInventor: Michael B. Harrison
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Patent number: 4659241Abstract: A rolling element bearing member designed for use in a preselected bearing operation, such as a gas turbine engine, which develops a predetermined operating hoop tensile stress in the member includes a hardened layer contiguous with a ductile core having a hardness less than 50 Rockwell C. For example, the hardened layer is a carburized layer of high hardness in the range of 58-66 Rockwell C. The hardened layer has improved resistance to crack initiation and propagation as a result of providing the layer with compressive residual stress in an amount greater than the predetermined operating hoop tensile stress, for example in the range of about 10-60 ksi to a depth up to about 0.06 inch. Such a member is made by providing a member of a metal alloy having the capability of developing such a hardened layer, and then processing the member to develop the layer in the amount of compression.Type: GrantFiled: February 25, 1985Date of Patent: April 21, 1987Assignee: General Electric CompanyInventors: Eric N. Bamberger, John C. Clark, Jr., Alexander H. Nahm