With Wear Surface Treatment Or Integrally Plated Wear Layer Patents (Class 418/178)
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Patent number: 6142755Abstract: An oil-free scroll compressor used for compression of air or the like, comprises an orbiting scroll having a spiral-shaped lap or laps formed on one or both sides of an end plate, and a stationary scroll having a lap or laps adapted to mate with the orbiting scroll to define a compression chamber or chambers.Grooves are formed on tips of the respective scroll laps, and elastic tip seals are fitted into the grooves in order to prevent leakage of compressed gas from between the laps and the end plates. Those surfaces of the orbiting scroll and of the stationary scroll or scrolls, which define the compression chamber or chambers, are subjected to surface treatment in order to prevent seizure or the like caused by sliding of the tip seals and the laps. The stationary scroll or scrolls are subjected to an anodizing coating treatment while the orbiting scroll is subjected to Ni--P--B treatment.Type: GrantFiled: July 2, 1998Date of Patent: November 7, 2000Assignee: Hitachi, Ltd.Inventors: Kazuaki Shiinoki, Isamu Kawano, Natsuki Kawabata, Akira Suzuki, Tatsuo Natori, Muneo Mizumoto, Shigeru Machida
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Patent number: 6139296Abstract: The present invention is to provide a refrigerant compressor comprising a compressing element driven by a rotary shaft, for compressing and discharging a sucked HFC type refrigerant or refrigerant mainly comprising the HFC type refrigerant by the compressing element, where a rotary shaft applied with the plasma sulphonitriding treatment on the surface is used as the rotary shaft. Or a vane applied with the plasma sulphonitriding treatment on the surface of a vane made of a steel equivalent to a high speed tool steel vane or a steel equivalent to a stainless steel is used. Accordingly, a refrigerant compressor comprising a rotary shaft or a vane having a low friction coefficient in a sliding portion on the surface of the rotary shaft or the vane and a high wear resistance can be provided even in the case an ester type refrigerator oil or an ether type refrigerator oil is used as the refrigerator oil and an HFC type refrigerant is used.Type: GrantFiled: October 9, 1997Date of Patent: October 31, 2000Assignee: Sanyo Electric Co., Ltd.Inventors: Masazo Okajima, Ayumi Mori, Kazuhisa Ishikawa, Takeo Komatsubara, Masahiko Kamata, Sachimine Suga, Hiroyuki Suma, Kyoji Itou
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Patent number: 6135737Abstract: A scroll hydraulic machine comprising a housing having a key groove, a fixed scroll disposed in said housing, a swirling scroll having a key groove disposed in said housing, engaging with said fixed scroll, and moving in a swirling motion, and an Oldham ring provided with a swirling key engaging, in a freely sliding manner, with said key groove formed on said swirling scroll, and a fixed key engaging, in a freely sliding manner, with the key groove formed on said housing, and Sn plated on at least one side surface of the swirling key and the fixed key.Type: GrantFiled: June 24, 1998Date of Patent: October 24, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shigeki Miura, Kimiharu Takeda, Kazuhide Watanabe, Takeshi Hirano
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Patent number: 6126421Abstract: In a scroll type compressor in which bottom plates (2, 3) are disposed on bottoms of involute grooves formed on scroll members (20, 30), respectively, each of the bottom plates has a thickness becoming gradually larger from an outer circumferential portion of each of the involute grooves towards a central portion thereof. The scroll members confront with each other in an axial direction with each of the bottom plates being interposed between the scroll members in the axial direction.Type: GrantFiled: June 10, 1999Date of Patent: October 3, 2000Assignee: Sanden CorporationInventors: Takayuki Matsumoto, Saori Shimizu
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Patent number: 6116876Abstract: A fixed scroll (16) and a movable scroll (18) cooperatively define compressing chambers therebetween. The movable scroll is driven by a crank pin (12) eccentrically attached to a shaft (11) which is rotated by an external driving source. A surface treatment for abrasion resistance is applied to at least one of an end surface of the crank pin and a confronting end plate of the movable scroll. It may also be arranged that an abrasion-resistant plate is interposed between the end surface of the crank pin and the confronting end plate of the movable scroll.Type: GrantFiled: May 17, 1999Date of Patent: September 12, 2000Assignee: Sanden CorporationInventors: Norio Kitano, Yuji Yoshii
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Patent number: 6106257Abstract: A hydraulic power transmission system including a stationary inner barrel connected between a hydraulic oil inlet pipe and a hydraulic oil return pipe and having a plurality of openings spaced around the periphery and a plurality of movable blocks moved in and out of the opening, and two outer barrels fixedly connected together with a gasket ring mounted there between and having a respective series of involute arched guide planes space on the inside and raised one behind another, wherein when a hydraulic oil is forced through the hydraulic oil inlet pipe into the inner barrel, it forces the arched movable blocks out of the opening of the inner barrel and flows through the involute arched guide planes of the outer barrel to push the vertical steps between each two arched guide planes, causing the outer barrels to rotate.Type: GrantFiled: July 10, 1998Date of Patent: August 22, 2000Inventor: Jen-Hsin Chen
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Patent number: 6093004Abstract: A pump or motor having a three-lobed rotor capable of being used within a hypocycloidal two-lobed stator that is designed primarily for use with a one-lobed rotor. The three-lobed rotor design allows for interchangeability with the two-lobed stator to provide for varying fluid displacements to meet particular demands. A specific application allows for the combination of both the three-lobed rotor along with a one-lobed rotor within the same two-lobed stator, thereby improving the efficiency of the pump or motor.Type: GrantFiled: February 12, 1998Date of Patent: July 25, 2000Assignee: Zenergy LLCInventors: Rajan Varadan, Richard Bach
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Patent number: 6079963Abstract: A scroll type compressor comprises a stationary scroll and a rotary scroll which is assembled with the stationary scroll so as to define a closed space, the outer surface of the rotary scroll 22 is formed thereon with a tin compound film containing a tin compound and having a thickness of 50 .mu.m. Such a coating film is never peeled off from a member even after long time operation, and is excellent in sealability and conformability, in the displacement type compressor.Type: GrantFiled: September 4, 1997Date of Patent: June 27, 2000Assignee: Hitachi, Ltd.Inventors: Yoshishige Endo, Eiichi Satoh, Akihiko Yamamoto, Yuji Yoshitomi, Koichi Inaba, Koichi Sekiguchi
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Patent number: 6071103Abstract: A member is disclosed which includes a hard carbon film provided through an interlayer or directly on a main body such as a vane. A mixed layer is formed within the main body or interlayer adjacent to an outer surface of the main body or interlayer. The mixed layer contains carbon and a constituent element of either the main body or the interlayer. The mixed layer has a carbon content gradient in its thickness direction so that a carbon content in a thickness portion thereof closer to an outer surface of the mixed layer is higher than in a thickness portion thereof remoter from the outer surface of the mixed layer.Type: GrantFiled: July 17, 1997Date of Patent: June 6, 2000Assignee: Sanyo Electric Co., Ltd.Inventors: Hitoshi Hirano, Keiichi Kuramoto, Yoichi Domoto, Naoto Tojo
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Patent number: 6062832Abstract: A scroll compressor having an extended life due to the support structure for the orbiting scroll, even when using a chlorine-free substitution refrigerant. The support structure includes an Oldham ring for supporting an orbiting scroll so as to allow the orbiting scroll more orbiting motion without rotating about a fixing scroll. The Oldham ring is formed of a different material from both a fixing member and the orbiting scroll. Hence, if a boundary lubrication state occurs in mutually sliding parts, only sliding between different materials occurs, and mutual adhesion in the portion of the boundary lubrication state is avoided. As a result, the shortening of the life due to the wearing of the support structure of the orbiting scroll is prevented.Type: GrantFiled: August 13, 1997Date of Patent: May 16, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroyuki Kawano, Hideo Hirano, Hideto Oka
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Patent number: 6053716Abstract: Vane for use in a rotary vane compressor or other rotary expansible chamber device and process for making the vane in which the vane comprises a vane body having a first tip, a second tip, and a vane body interconnecting the tips. At least one of the first and second tips comprises a metal alloy and a lubricating agent provided in admixture with the metal alloy. The vane body comprises a metal alloy and a plurality of inorganic particles provided in admixture with the metal alloy. The inorganic particles have a coefficient of thermal expansion which is less than the coefficient of thermal expansion of the metal alloy.Type: GrantFiled: January 14, 1997Date of Patent: April 25, 2000Assignee: Tecumseh Products CompanyInventors: Otto K. Riegger, Robert B. Weatherwax, III
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Patent number: 6033194Abstract: A scroll-type fluid displacement apparatus includes a pair of scroll members, each having a circular end plate and a spiral wrap element extending from an axial end surface of the circular end plate. An anti-wear plate member is disposed in the inner surface of the end plate of at least one of the scroll members and extends from a first place adjacent the radial center of the end plate to a second place positioned radially and spirally inward of the outer terminal end of the spiral wrap element of the scroll member. An axial gap is formed between the radial center of the inner surface of the end plate of the scroll member and the radial inner end of the spiral wrap element of the opposite scroll member. The radial inner end of the spiral wrap element of one scroll member is thereby prevented from contact with the radial center of the inner surface of the end plate of the other scroll member.Type: GrantFiled: June 19, 1997Date of Patent: March 7, 2000Assignee: Sanden CorporationInventor: Jiro Iizuka
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Patent number: 6030191Abstract: A suction pump (22) suitable for use in a fuel dispensing system (20) or other fluid delivery system for volatile liquids. The suction pump includes a pump casing that defines a pump chamber (52) with inlet and outlet ports. A rotor (54) with vanes (58) is seated in the pump chamber. The vanes define fluid cavities (96a, 96b, 96c, . . . 96f) that rotate between the inlet and outlet ports. During each turn of the rotor, each fluid cavity passes through a section of the pump chamber in which it is isolated from both the inlet port and outlet port. A bleed duct (102) extends from the outlet port. A bleed port (104) extends from the bleed duct to the section of the pump chamber that defines the isolated position of the fluid cavities. During operation of the pump, pressurized fluid discharged from the outlet port flows through the bleed duct and bleed port into the isolated fluid cavity.Type: GrantFiled: August 20, 1997Date of Patent: February 29, 2000Assignee: Delaware Capital Formation, Inc.Inventors: Gregory P. Wood, Michael D. Walters
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Patent number: 6019583Abstract: A downhole submersible fluid pump having a progressive cavity motor section driving a rotary pump such as a centrifugal or axial pump. In the motor section an inner helical member is fixed relative to an outer rotatable member having helical threads. By forcing power fluid into the motor chamber between the inner and outer member causes the outer member to rotate relative to the fixed inner member. This rotary motion is transmitted to a rotary member of a centrifugal pump, for example, drawing fluids from the subterranean formation upwardly as produced fluids.Type: GrantFiled: March 14, 1997Date of Patent: February 1, 2000Inventor: Steven M. Wood
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Patent number: 5993183Abstract: Gears for pumping non-lubricating fluids at high pressure are provided which include special coatings. One of the gears is coated with a combination of nickel and polytetrafluoroethylene; the other gear is coated with a combination of carbon and tungsten carbide. Because the coatings are different and have different hardnesses, galling is prevented. Preferably, the gears are fabricated from stainless steel and, therefore, in the event a scratch or nick in the coating is produced, corrosion is prevented. The gears are useful for gear pumps used to pump fire fighting liquids and foam at high pressures.Type: GrantFiled: September 11, 1997Date of Patent: November 30, 1999Assignee: Hale Fire Pump Co.Inventors: Michael A. Laskaris, Frank C. Keirsey, Jr.
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Patent number: 5951273Abstract: A tip of a vane slid with a rolling piston is mechanically finish-ground in the direction of the sliding movement between the vane and the rolling piston, and provided with a protective coating film being proof against abrasion which is composed of non-ferrous metal formed by a physical vapor deposition method, or composed of a chromium nitride compound formed by an ion plating method. Hydrofluorocarbon is employed as a refrigerant, and ester oil being compatible with the refrigerant is used as a lubricating oil.Type: GrantFiled: June 17, 1997Date of Patent: September 14, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Matsunaga, Shigeru Muramatsu
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Patent number: 5947710Abstract: Lubrication deficiencies related to the use of lubricants in HFC refrigeration compressors can be mitigated by providing a diamond-like-carbon coating on a member subject to wear due to lubrication deficiencies. Specifically, the tip of the vane of a rotary compressor is coated with a diamond-like-carbon coating made up of alternating layers of tungsten carbide and a lubricious material 0.5 to 5.0 microns thick.Type: GrantFiled: June 16, 1997Date of Patent: September 7, 1999Assignee: Carrier CorporationInventors: Clark V. Cooper, Paul J. Bushnell, Martin M. Mertell
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Patent number: 5888057Abstract: A scroll-type refrigerant fluid compressor includes a fixed scroll having a first circular end plate from which a first spiral wrap extends, and an orbiting scroll having a second circular end plate from which a second spiral wrap extends. The spiral wraps interfit each other at an angular and radial offset to form line contacts defining a pair of sealed-off fluid pockets. An anti-wear plate is disposed on one end surface of the second circular end plate of the orbiting scroll that engages with the second spiral element of the orbiting scroll. An annular boss is formed at a central portion of the other end surface of the second circular end plate of the orbiting scroll. An inner end of a drive shaft is operatively connected to the orbiting scroll through a bushing which is rotatably disposed within the boss. An axial hole is centrally formed through the second circular end plate of the orbiting scroll.Type: GrantFiled: June 10, 1997Date of Patent: March 30, 1999Assignee: Sanden CorporationInventors: Norio Kitano, Takeo Takahashi, Tamaki Yamamoto
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Patent number: 5876192Abstract: A differential expansion control assembly is provided for a pump. The pump has a pump body with a base portion and cover portion of a first material with a first thermal expansion coefficient and a pumping mechanism of a second material with a second thermal expansion coefficient different from the first thermal expansion coefficient. The differential expansion control assembly includes at least one member disposed between the base portion and cover portion to negate a difference between the first thermal expansion coefficient and the second thermal expansion coefficient and maintain a relative controlled clearance between the cover portion and the pumping mechanism. The differential expansion control assembly also includes a seal disposed between the cover portion and base portion to allow for differential expansion of the pump body without leakage of fluid between the cover portion and base portion.Type: GrantFiled: November 8, 1996Date of Patent: March 2, 1999Assignee: Ford Global Technologies, Inc.Inventor: William Calvin Follmer
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Patent number: 5797366Abstract: An internal combustion engine comprises a toroidal combustion chamber housing within which slides at least one piston. The combustion chamber housing has a circumferential longitudinal slot sealed by a ring seal to which the pistons are rigidly attached. A mechanism is provided for reversibly creating one or more transverse seals within the combustion chamber housing. The space between the transverse seals constitutes one or more combustion chambers. The simplest embodiment of the engine has one combustion chamber and one piston. The combustion chamber is operationally divided by the piston into two regions. The space between the transverse seal and a trailing surface of the piston defines a combustion region. The space between the transverse seal and a leading surface of the piston defines an exhaust region. In each power cycle of the engine, compressed air, fuel and steam are injected into the combustion region and ignited.Type: GrantFiled: November 1, 1996Date of Patent: August 25, 1998Assignee: New Devices Engineering A.K.O. Ltd.Inventor: Victor Isaevich Adamovski
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Patent number: 5791886Abstract: A scroll type fluid displacement apparatus includes a pair of scrolls having a circular end plate and a spiral element extending from an axial end surface of the circular end plate. An involute slit is formed in an involute plate. The spiral elements are inserted into the involute slit so that the involute plate and axial end plate adjoin one another. The involute slit includes an inner edge, an outer edge and an extreme line joining the inner edge with the outer edge. A first radial gap is formed between the extreme line and radial ends of the spiral element. The first radial gap is greater than a second radial gap formed between the inner and outer edges of the radial ends of the spiral element. First portions of the inner edge and outer edge are prevented from contacting the end of a spiral element even if the end of the spiral element thermally expands more than other portions of the spiral element.Type: GrantFiled: October 17, 1996Date of Patent: August 11, 1998Assignee: Sanden CorporationInventors: Yasuo Kikuchi, Yoshitaka Koitabashi, Shigeru Ito
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Patent number: 5759019Abstract: The stator, rotor and/or flex shaft of a progressive cavity pump is made up of composite materials, e.g., fiberglass and resin, in a variety of combinations with and without bonded resilient elastomers. The composites are formulated to provide resiliency and non-resiliency where needed. The flex shaft between the rotary power source and the rotor is made of composite materials and designed to absorb the orbital and gyrational movement of the rotor.Type: GrantFiled: April 24, 1996Date of Patent: June 2, 1998Assignee: Steven M. WoodInventors: Steven M. Wood, Brian E. Spencer
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Patent number: 5741127Abstract: A vane for a vane compressor comprises an aluminum based metal and a clad of a ferrous metal provided on the surface of the aluminum base metal. The vane is formed by joining a pipe of the ferrous metal onto the surface of the aluminum based basis pressing process.Type: GrantFiled: December 5, 1995Date of Patent: April 21, 1998Assignee: Zexel CorporationInventors: Toshihiro Murayama, Tadashi Saito
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Patent number: 5727934Abstract: A scroll fluid machine has a stationary scroll having a first end plate and a first spiral wrap projecting from one side of the first end plate. The first spiral wrap has a tip end. A swivel scroll has a second end plate and a second spiral wrap that projects from the one side of the second end plate. The second spiral wrap has a second end tip, and the first and second spiral wraps are engaged with each other. A first thin steel plate is provided on one side of the end plate between the first end plate and the second tip end. A first thin steel plate has a surface side that faces the second tip end. Further, a second thin steel plate is on one side of the second end plate between the second end plate and the first tip end. The second thin steel plate has a surface side that faces the first tip end. Both of the first and second thin steel plates are provided with conformable layers on the surfaces facing the tip ends.Type: GrantFiled: October 1, 1996Date of Patent: March 17, 1998Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Masumi Sekita, Makoto Takeuchi, Yasuharu Maruiwa, Tetsuo Shigeoka, Tetsuzo Ukai, Mikihiko Ishii
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Patent number: 5722820Abstract: A progressing cavity pump is provided in which the compressive fit between the rotor and stator is gradually reduced with the distance from the suction end of the pump. This gradual decrease in compressive fit allows for increased slippage near the discharge end of the pump, resulting in better distribution of the internal differential pressure along the length of the pump. The differential pressure distribution in turn reduces heat build-up near the discharge end, increasing the life of the elastomeric stator or rotor.Type: GrantFiled: May 28, 1996Date of Patent: March 3, 1998Assignee: Robbins & Myers, Inc.Inventors: Alan G. Wild, Kamran Z. Mirza
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Patent number: 5672054Abstract: Lubrication deficiencies related to the use of synthetic lubricants such as POE oils in refrigeration compressors can be mitigated by providing a diamond-like-carbon coating on a member subject to wear due to lubrication deficiencies. Specifically, the tip of the vane of a rotary compressor is coated with a diamond-like-carbon coating made up of alternating layers of tungsten carbide and a lubricious material 0.5 to 5.0 microns thick.Type: GrantFiled: December 7, 1995Date of Patent: September 30, 1997Assignee: Carrier CorporationInventors: Clark V. Cooper, Paul J. Bushnell, Martin M. Mertell
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Patent number: 5645896Abstract: A hardfacing for downhole progressing cavity pumps is disclosed as well as a method for producing same. The hardfacing consists of a metal carbide layer applied to the ferrous pump rotor body by way of plasma spraying and a top layer of metallic material having a lower hardness than the metal carbide. The metal carbide layer has a grainy surface with a plurality of peaks and intermediate depressions, the peaks being formed by metal carbide grains at the surface of the metal carbide layer. The thickness of the top layer is adjusted such that the depressions between the peaks of the metal carbide layer are completely filled thereby providing the rotor with a metal carbide hardfacing of significantly reduced surface roughness. In the process of the invention, the pump rotor, which may be provided with a molybdenum bonding layer, is plasma coated with the metal carbide and the resulting carbide layer is covered with the metallic material top layer.Type: GrantFiled: January 18, 1996Date of Patent: July 8, 1997Assignee: Kudu Industries Inc.Inventor: Robert A.R. Mills
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Patent number: 5616017Abstract: A rotary compressor comprises an outer casing, a rotary type compression mechanism accommodated in the outer casing in a sealed manner, and an electric motor for driving the rotary type compression mechanism. The rotary type compression mechanism is provided with a cylinder having an inner peripheral surface to which a discharge port is formed, and the inner peripheral surface of the cylinder has a portion formed of a valve sheet to which said discharge port is formed.Type: GrantFiled: September 12, 1995Date of Patent: April 1, 1997Assignee: Kabushiki Kaisha ToshibaInventors: Hirokazu Iizuka, Masashi Ohmura, Masataka Kondo, Hideki Kobayashi, Hiroyuki Mizuno, Takaya Yamazaki, Kazuo Shibata
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Patent number: 5609479Abstract: A forced compression type pump including a cylindrically shaped pump case, an eccentric rotating body shaft-supported on said pump case at an eccentric position relative to said pump case and a compressing and forcibly sending member movable in a radial direction or said eccentric rotating body and adapted to be brought into press contact with the interior wall of said pump case, characterized in that the interior space is formed at the central part of said eccentric rotating body, a plurality of guide grooves are formed in a radial direction from said interior space to the circumferential surface of said eccentric rotating body, a plurality of circumferentially contacting cylindrical body inserted in said guide grooves and movable freely in a radial direction are formed, said plurality of circumferential contacting cylindrical body are in a planetary relationship relative to said central cylindrical body and the outer circumferential surfaces of said circumferentially contacting bodies are brought into pressType: GrantFiled: August 30, 1995Date of Patent: March 11, 1997Assignee: Japan I.D. Tech. Inc.Inventor: Hirokazu Yoshida
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Patent number: 5584678Abstract: A scroll type fluid machine has a pair of mutually engaged scrolls, one being made of an aluminum material, and the other being made hard. A wear amount of an engaging tip seal and end plate is reduced, and the growth of wear of both elements is equalized. Tip seals (47, 48) are provided at the tips of wraps (12, 16) of the pair of scrolls (10, 14) and are made of a composite plastic material composed of a polyphenylene sulfide as a base material and a carbon fiber, and other materials as filler. The carbon fiber composition rate of the tip seal material of the scroll (10) made of an aluminum material is made higher than the carbon fiber composition rate of the tip seal material of the other scroll (14) made of an aluminum material having a surface treatment or of a ferrous metal or of a ferrous metal having a surface treatment. Thereby the wear amount of each engaging tip seal (47, 48) and end plate (11, 15) is reduced, and simultaneously the growth of wear of both elements is equalized.Type: GrantFiled: September 13, 1995Date of Patent: December 17, 1996Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Katsumi Hirooka, Hiroyuki Kobayashi, Susumu Matsuda
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Patent number: 5584677Abstract: A base plate 41 of a movable scroll member 4 has, at its outer periphery, a section 44 with no scroll wall, while a scroll wall 22 of a stationary scroll member 2 has a section 24 for connecting to an outer cylindrical shell 22. These sections 44 and 24 make a relative lateral slide movement during an orbital movement of the movable scroll member 4 with respect to the stationary scroll member 2. These sections 44 and 24 have axially faced inner and outer edges 44-1 and 24-1, over which the relative lateral movement occurs. These inner and outer edges 44-1 and 24-1 are bevelled, the bevelling being such that any skewed movement of the movable scroll member with respect to the stationary scroll member does not cause locally increased contact pressure, thereby preventing galling as well as seizing.Type: GrantFiled: March 14, 1995Date of Patent: December 17, 1996Assignees: Nippondenso Co., Ltd., Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kimihiro Ishikawa, Takashi Miyakawa, Tetsuhiko Fukanuma, Tetsuo Yoshida
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Patent number: 5573390Abstract: In order to prevent the cracking of a coating of sliding material, in which an electroless Ni-B plating coating layer is formed on the surface of aluminum alloy, an electroless Ni-P plating coating layer is provided on the aluminum alloy.Type: GrantFiled: January 27, 1995Date of Patent: November 12, 1996Assignees: Surtec Kariya Co., Ltd., Taiho Kogyo Co., LtdInventors: Katsuhiro Takeuchi, Shogo Muramatsu, Yoichiro Toyama, Hirokazu Kondo
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Patent number: 5567140Abstract: A rotary lobe pump comprises a pump housing defining an obround pump chamber and a pair of lobe rotors in the pump chamber. The rotors are mounted on rotatable shafts which are connected by timing gears such that the rotors rotate to cause a fluid to displace through the chamber. The pump chamber is defined in the pump housing by opposed front and rear end walls which are perpendicular to the axes of the rotors and by arcuate side walls with which the rotors make sealing contact and which gradually wear out thereby reducing the tightness of the seal and thus the pumping efficiency of the rotary lobe pump. The rear end wall includes two removable end wear plates which each include a rearwardly projecting key engaged in a corresponding keyway defined in the pump housing with bolts extending from outside of the housing inwardly towards the end wear plates and engaging the keys thereof for securing the end wear plates to the housing.Type: GrantFiled: April 24, 1995Date of Patent: October 22, 1996Assignee: ITT CorporationInventor: Ian Dodd
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Patent number: 5560741Abstract: A non-contact vane-type fluid-displacement machine includes a stator housing having an annular interior surface defining an interior bore and a rotor supported in an eccentric position in the interior bore of the stator housing relative to the annular interior surface thereof to undergo rotation relative to the stator housing about a central rotational axis. The rotor has a plurality of slots radially defined therein relative to the rotational axis. The machine also has a plurality of vanes disposed in the radial slots of the rotor. The vane is mounted to the rotor to undergo reciprocable movement in a radial direction relative to the rotational axis of the rotor such that an outer tip portion of the vane is maintained in a non-contacting substantially sealed relationship with the annular interior surface of the stator housing.Type: GrantFiled: June 28, 1994Date of Patent: October 1, 1996Inventor: Thomas C. Edwards
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Patent number: 5554020Abstract: A high efficiency pump having relatively-moving parts constituted of a light weight material and a coating on at least one of the parts to effect essentially zero clearance between the parts where they merge together. The coating is comprised of solid lubricants in a polymer resin matrix stable up to 700.degree. F.Type: GrantFiled: October 7, 1994Date of Patent: September 10, 1996Assignee: Ford Motor CompanyInventors: V. Durga N. Rao, Carlo A. Fucinari
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Patent number: 5509388Abstract: A rotary engine includes a cylindrical rotor having four spaced apart vanes therein mounted in a stator housing having an oblong perimeter casing which defines generally crescent shaped, diametrically opposite first and second working chambers in which the rotor vanes travel. Inlet and outlet ports are disposed at respective ends of the working chambers, and a flow chamber is joined to the casing between the working chambers. The flow chamber temporarily stores compressed fluid from the first working chamber and discharges it into the second working chamber wherein combustion takes place for rotating the rotor.Type: GrantFiled: December 30, 1994Date of Patent: April 23, 1996Assignees: Robert W. Burnett, Kathleen C. BarryInventor: David C Andres
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Patent number: 5498142Abstract: A hardfacing for downhole progressing cavity pumps is disclosed as well as a method for producing same. The hardfacing consists of a metal carbide layer applied to the ferrous pump rotor body by way of plasma spraying and a top layer of metallic material having a lower hardness than the metal carbide. The metal carbide layer has a grainy surface with a plurality of peaks and intermediate depressions, the peaks being formed by metal carbide grains at the surface of the metal carbide layer. The thickness of the top layer is adjusted such that the depressions between the peaks of the metal carbide layer are completely filled thereby providing the rotor with a metal carbide hardfacing of significantly reduced surface roughness. In the process of the invention, the pump rotor, which may be provided with a molybdenum bonding layer, is plasma coated with the metal carbide and the resulting carbide layer is covered with the metallic material top layer.Type: GrantFiled: May 30, 1995Date of Patent: March 12, 1996Assignee: Kudu Industries, Inc.Inventor: Robert A. R. Mills
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Patent number: 5496159Abstract: A rotary displacement pump including an external member or housing having inlet and outlet channels and a cavity. The pump also includes an internal member or housing having a shell with an inlet opening and an outlet opening therein, the shell being received in the cavity so that the inlet opening and the outlet opening is aligned with the inlet and outlet channels. Further included is a fluid drive member received within the shell for moving fluid from the inlet to outlet channels. The inlet opening and the outlet opening in the shell define fluid flow transition regions.Type: GrantFiled: March 22, 1994Date of Patent: March 5, 1996Assignee: Xerox CorporationInventor: Ronald D. Devore
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Patent number: 5492460Abstract: In a scroll type machine, such as a scroll compressor, the difference in level between the axial end surface of a wear-resistant plate (40) installed at the periphery of the end plate (17) of an orbiting scroll (16) and the axial end surface of the end plate (17) is set within 0.+-.10 .mu.m. This difference in level (.delta.) is set to this range to prevent wear of the wear-resistant plate and the end plate of the orbiting scroll and to prevent deterioration in the performance of the scroll-type compressor so that a scroll-type compressor with high performance and high reliability can be realized.Type: GrantFiled: March 8, 1994Date of Patent: February 20, 1996Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Kimiharu Takeda, Tetuzou Ukai, Masumi Sekita
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Patent number: 5474043Abstract: An internal combustion engine has a ring-shaped stator with a plurality of thin slits. A rotor, having a plurality of helicotoroidal troughs formed on its inner surface, encloses the stator. A planar vane wheel, having a plurality of radially extending vanes, is resident in each of the thin slits, with the vanes communicating with the respective helicotoroidal troughs. Rotation of the rotor imparts rotation to the vane wheels. The interaction of the stator, troughs, and vanes produces a plurality of sequential intake, compression, combustion, expansion, and exhaust chambers.Type: GrantFiled: June 17, 1994Date of Patent: December 12, 1995Assignee: Mallen Research Ltd. PartnershipInventor: Brian D. Mallen
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Patent number: 5470213Abstract: A scroll type compressor has a movable scroll which is supported by a drive shaft by way of an eccentric pin in a housing. The movable scroll engages in an orbital movement for defining a compression chamber with a fixed scroll which is disposed opposite to the movable scroll. The compression chamber decreases in size in accordance with the orbital movement of said movable scroll for compressing gas in the compression chamber. A first ring orbits together with the movable scroll between the movable scroll and the housing, for receiving compressive reaction force acting on the movable scroll. A second ring which is secured to the housing receives the compressive reaction force received by and acting on the ring.Type: GrantFiled: April 13, 1994Date of Patent: November 28, 1995Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Masao Iguchi, Tetsuhiko Fukanuma, Tetsuya Yamaguchi, Tetsuo Yoshida
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Patent number: 5468130Abstract: A movable member slides on a fixed member. The movable member is made of aluminum alloy. An inner layer coats the movable member. The inner layer is made of a material capable of adhering to the aluminum alloy. An outer layer coats the inner layer and contacts the fixed member. The outer layer has greater hardness than the hardness of the inner coating layer.Type: GrantFiled: August 22, 1994Date of Patent: November 21, 1995Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kiyohiro Yamada, Masao Iguchi, Izuru Shimizu, Yasushi Watanabe
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Patent number: 5419690Abstract: A scroll type refrigerant compressor having an aluminum or aluminum alloy housing unit in which a stationary scroll unit having a stationary spiral member and a movable scroll unit having a movable spiral member are encased in such a manner that the movable spiral member moves along a predetermined orbiting path without rotating about an axis thereof, and a reinforcing ferric metal liner fixedly attached to an inner cylindrical face of a cylindrical wall portion of the aluminum or aluminum alloy housing unit so as to prevent the inner cylindrical face of the housing unit from being mechanically cracked by the movable spiral member of the movable scroll unit during the running of the compressor even if the movable scroll unit jams due to entrance of foreign materials between the outer face of the movable spiral member and the inner face of the housing unit.Type: GrantFiled: February 3, 1994Date of Patent: May 30, 1995Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kunifumi Goto, Tetsuhiko Fukanuma, Tetsuo Yoshida, Shinya Yamamoto
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Patent number: 5401149Abstract: Compressor bodies, an accelerator and a main motor are disposed on a base, while an intercooler, an aftercooler, an oil cooler and a coolant cooler are disposed perpendicular to the axial direction of the motor so that the directions, in which the tube nests of the gas coolers are drawn out, are made to be the same. A control panel having a maintenance display is mounted on a front panel composed of panel portions which are mounted pivotally around respective remote or opposite side ends. Portions to be inspected daily are disposed near the front panel and one side panel adjacent thereto. The compressor bodies including rotors that have been coated with a melted and solidified substantially homogeneous and continuous layer of a tetrafluoroethylene-perfluoroalkylvinylether copolymer that is substantially devoid of pinholes.Type: GrantFiled: September 7, 1993Date of Patent: March 28, 1995Assignee: Hitachi, Ltd.Inventors: Seiji Tsuru, Shinichi Hirose, Junji Okita, Tadashi Kaneki, Katsuaki Kikuchi
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Patent number: 5395221Abstract: A rotor for a positive displacement motor or pump in which the rotor is coated with a metal carbide and metal alloy coating or a metal boride and metal alloy coating to impart excellent wear-resistance and corrosion-resistance properties to the rotor when used in abrasive and/or corrosion resistance environmental.Type: GrantFiled: March 18, 1993Date of Patent: March 7, 1995Assignee: Praxair S.T. Technology, Inc.Inventors: Robert C. Tucker, Jr., Melvin D. Mendenhall, Madapusi K. Keshavan
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Patent number: 5382144Abstract: Wear resistance, seizure resistance, durability and corrosion resistance of an Oldham ring made of an aluminum alloy engaging with a swivel scroll made of an aluminum alloy are improved. The Oldham ring comprises a substrate made of an Al--Si alloy which has a light weight and a high strength, a bond layer of a multiplex zinc base alloy containing Cu and Ni as a primary plating layer which is formed on the substrate, and an electroless Ni--P plating layer having a hardness of MHV550 which is formed on the outermost surface of the Oldham ring.Type: GrantFiled: January 18, 1994Date of Patent: January 17, 1995Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Tohru Kato, Yoshiaki Sato
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Patent number: 5364248Abstract: The object of the present invention is to provide sliding members having preferable lubrication and seizure resistance. Sliding members comprising a columnar texture which is composed from at least one of metal nitrides, metal oxides, metal carbides, and metals on a base member, wherein the columnar texture is composed of assemblies of fine columnar asperities, with intervals formed between the columnar asperities being connected to each other so as to form a net work, and with gaseous, liquid, or solid lubricants being maintained in the intervals. The mutually connected intervals in the columnar texture are superior in filling and holding of lubricants, and the above described superiorities improve lubrication and seizure resistance and extend sliding life.Type: GrantFiled: March 23, 1993Date of Patent: November 15, 1994Assignee: Hitachi, Ltd.Inventors: Shoichi Nakashima, Yukiko Fukaya, Katsuhiro Komuro, Tadashi Iizuka
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Patent number: 5364250Abstract: A method of producing an oil-free screw compressor has the following steps: preparing a semi-finished metallic female rotor which has a spiral profile, and a semi-finished metallic male rotor which has a spiral profile; forming a metallic coating film containing particles of grinding material on the surface of the semi-finished female rotor; forming, on the surface of the semi-finished male rotor, a coating film of a material softer than the metallic coating film on the female rotor; grinding the surfaces of the semi-finished rotors into predetermined configurations; mounting the ground rotors on bearings so that the rotors are assembled in a rotor casing with a substantially constant spacing held between the axes of the semi-finished rotors; mounting timing gears on the rotors so as to drivingly connect the rotors each other; and driving the rotors by driving means while restraining the back lash in the rotating direction by means of the timing gears and applying a compression load to the rotors so that theType: GrantFiled: September 14, 1993Date of Patent: November 15, 1994Assignee: Hitachi, Ltd.Inventors: Masakazu Aoki, Tatsuo Natori, Hidetomo Mori
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Patent number: 5356277Abstract: A rotary vane compressor comprises a cylinder having two closed ends defining a cylinder chamber in which is rotatably mounted a rotor. The rotor carries a plurality of radially movable vanes which move radially into sliding contact with the inner surface of the cylinder chamber during rotation of the rotor to compress a refrigerant gas. The rotor is rotationally driven by a rotor shaft rotatably mounted by bearings in the cylinder ends. To prevent destruction of the ozone layer, a refrigerant containing no chlorine, such as HFC-134a (1,1,1,2-tetrafluoroethane; CH.sub.2 FCF.sub.3) is used, and to compensate for the inferior lubricating properties of the chlorine-free refrigerant, the bearings are provided with a manganese phosphate coating of 10 .mu.m-15 .mu.m thickness to prevent cohesion and seizure of the mutually contacting surfaces of the bearings and rotor shaft.Type: GrantFiled: February 11, 1993Date of Patent: October 18, 1994Assignees: Seiko Seiki Kabushiki Kaisha, Calsonic Corp.Inventors: Masaru Yamaguchi, Makoto Ijiri, Shuji Yamane, Yutaka Shimizu
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Patent number: 5314321Abstract: A screw-type rotary fluid machine such as a compressor or a vacuum pump has male and female rotors which rotate within a casing, with or without mutual contact. At least one of the male and female rotors being surface-treated to have a treated surface structure. The treated surface structure is a multi-layered structures composed of a plurality of layers including a non-electrolytic Ni plating layer and at least one covering layer of organic resin. The organic resin may be one or more kinds selected from a group of engineering plastics, so as to improve mechanical strength.Type: GrantFiled: October 28, 1992Date of Patent: May 24, 1994Assignee: Hitachi, Ltd.Inventors: Akihiko Yamamoto, Toshihiro Yamada, Tatsuo Natori, Kotaro Naya, Motohiro Satoo, Mitsuru Fujiwara, Katsumi Matsubara, Kazuaki Shinoki, Hirotaka Kameya