Patents by Inventor Masaaki Sakamoto
Masaaki Sakamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5334460Abstract: A Cu-Pb system composite bearing has three layers including a backing metal, a bearing alloy layer formed on the backing metal, and an overlay formed on the bearing alloy layer. The Cu-Pb bearing alloy contains 2 to 10% Ni and 0.05 to 1.0% B. An example of the composition of the Cu-Pb system bearing alloy consists of 0.5 to 8% Sn, 15 to 30% Pb, 0.2% or less P, 2 to 10% Ni, 0.05 to 1.0% B and the balance of Cu and unavoidable impurities. The Cu-Pb bearing alloy must have a hardness over HV80. Ni and B contained in the bearing alloy decrease the affinity of the Cu-Pb bearing alloy for tin in the overlay of a tin-containing lead alloy. The corrosion resistance of the bearing is improved by plating the both surfaces of the composite bearing with Sn, Pb or an alloy thereof.Type: GrantFiled: December 2, 1992Date of Patent: August 2, 1994Assignee: Daido Metal CompanyInventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Kenji Sakai
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Patent number: 5328772Abstract: A multilayer sliding material for high-speed engine, comprising a steel back metal, a Cu or Cu-base alloy plating layer, a Cu-Pb bearing alloy layer, and an overlay, said steel back metal having 155 or more of Vickers hardness and 42 kgf/mm.sup.2 or more of 0.2% yield strength, a Cu-Pb bearing alloy layer containing 15-30 wt % of Pb and 0.5-2.0 wt % of Sn and having 0.25 cal/cm.s..degree. C. or more of thermal conductivity, 75 or more of Vickers hardness and 18 kgf/mm.sup.2 or more of tensile strength, said overlay of a lead base alloy containing 2-8 wt % of Sn and 3-11 wt % of In and having more than 250.degree. C. of melting start temperature. The material has a superior antiseizure property at high speed of engine. In particular, the rising of the melting start temperature of the metal of the overlay and the thermal conductivity of the bearing alloy provides a superior sliding property of plain bearing at high speed of engine.Type: GrantFiled: February 12, 1992Date of Patent: July 12, 1994Assignee: Daido Metal CompanyInventors: Tadashi Tanaka, Masaaki Sakamoto, Motomu Wada, Koichi Yamamoto, Hideo Ishikawa, Youji Nagai, Kenji Sakai
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Patent number: 5298336Abstract: The present invention provides a multilayer composite sliding material with excellent seizure resistance property having a steel plate or a steel plate having surfaces plated with copper or the like; a bond layer having a thickness of 0.05 to 0.5 mm, formed on the steel plate, and made of a sintered powder material consisting of 5 to 16% Sn, 0 to 15% Pb, 0 to 0.5% P and balance essentially Cu; and an alloy layer having a thickness of 0.1 to 1.0 mm, formed on the bond layer, and made of a sintered powder material consisting of 5 to 16% Sn, 1 to 12% MoS.sub.2 and balance essentially Cu. In a modified form of the alloy layer, not more than 20% Pb, not more than 1% P or not more than 12% Ni may be added. MoS.sub.2 powder may be coated with Cu or Ni.Type: GrantFiled: February 17, 1993Date of Patent: March 29, 1994Assignee: Daido Metal Company, Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Tsukimitsu Higuchi
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Patent number: 5298052Abstract: An Ni-based bearing alloy consisting, by weight, of 9-30% Cr, 5-19% Fe, 0.1-1.5% Si, 2-22% Co, 1.4-11.0% Mo, and the balance Ni and incidental impurities, said alloy having a matrix in which hard particles of a Co-Mo-Cr-Si alloy and/or BN are uniformly dispersed in weight ratios of 5 to 35% and not more than 5.0, respectively. The Ni-based alloy matrix provides superior heat resistance. Hard particles of Co-Mo-Cr-Si alloy uniformly dispersed in the matrix improve sliding characteristic with or without uniform dispersion of Bn as a solid lubricant, whereby the bearing alloy exhibits superior heat resistance and sliding characteristic when used in high temperature oxidizing atmosphere.Type: GrantFiled: June 11, 1992Date of Patent: March 29, 1994Assignee: Daido Metal Company, Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Kenji Sakai
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Patent number: 5275543Abstract: An Oldham ring of a scroll type compressor having a swivel scroll of aluminum alloy. The Oldham ring is of cast aluminum alloy and has a pair of projections (a) serving to engage with a pair of guide grooves formed in a surface of the swivel scroll adjacent to a crankshaft. Sliding surfaces of the projections which are to be brought into contact with inner surfaces of the guide grooves are each covered with a metal sheet made of a metal which is different from aluminum and aluminum alloys. It is recommended that the metal sheet has the following thickness (t): t=0.5-2.5 mm, T/20.ltoreq.t.ltoreq.T/4 (where, T represents the widthwise dimension of the projection in the circumferential direction of the Oldham ring). The metal sheet is united with the Oldham ring by insert casting.Type: GrantFiled: September 16, 1992Date of Patent: January 4, 1994Assignee: Daido Metal Company, Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Toshio Egami, Izumi Maruyama, Yoshiaki Sato
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Patent number: 5256494Abstract: The sliding member of the invention comprises a steel backing and a sintered Cu-alloy layer mounted integrally on one surface of the backing metal, wherein the sintered Cu-alloy comprises 1 to 15% Sn, 1 to 20% Ni-B compound, 1% or less phosphorus, and the balance of Cu and impurities. Cu-alloy may further contain 1 to 30% Pb and/or 0.5 to 8% graphite. Pb and graphite provide the sliding alloy layer with good lubrication property. Preferably the Ni-B compound is used, which is composed of 7 to 15% B and the balance of Ni and impurities.Type: GrantFiled: November 26, 1991Date of Patent: October 26, 1993Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Tsukimitsu Higuchi
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Patent number: 5246509Abstract: A copper base alloy suitable for use as a material of a sliding member, superior in seizure resistance, wear resistance and corrosion resistance. The alloy comprises 1.0 to 3.5 wt % Mn, 0.3 to 1.5 wt % Si, 11.5 to 25 wt % Zn, 5 to 18 wt % Pb and the balance substantially Cu and incidental impurities, the lead being uniformly distributed through the structure of the alloy. The alloy has a microstructure of which matrix is composed of .alpha.-phase alone. The alloy can further contain at least one selected from the group consisting of 0.02 to 1.5 wt % Mg and 0.1 to 1.5 wt % Te and/or at least one selected from the group consisting of 0.5 to 3.0 wt % Ni and 0.3 to 3.0 wt % Al.Type: GrantFiled: July 21, 1992Date of Patent: September 21, 1993Assignee: Daido Metal Company Ltd.Inventors: Tohru Kato, Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto
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Patent number: 5242717Abstract: The present invention relates to a composite sliding member having a backing metal and a sliding layer consisting of lead-containing copper alloy and being bonded to the backing metal, and to the method of producing the same. The present invention resides in more superior sliding performance exhibited due to uniform and fine distribution of lead particles in the copper alloy matrix. The method of the present invention to produce composite sliding members comprises using the atomized powder in which lead particles are finely and uniformly distributed in the alloy matrix and forming a cladding layer as the sliding layer through a plasma arc welding apparatus.Type: GrantFiled: November 20, 1992Date of Patent: September 7, 1993Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Hideyuki Kidokoro
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Patent number: 5200048Abstract: There is disclose a method of and apparatus for surface-treatment of half sliding bearings having a multi-layer construction including a steel backing, a bearing alloy layer of copper alloy or aluminum alloy, an intermediate plating layer and a surface layer. A plurality of half sliding bearings are attached to a support member in such a manner that the half sliding bearings are arranged end-to-end into a semi-cylindrical configuration. The support member is transferred to be sequentially inserted into a plurality of openable and closable plating cases mounted respectively within pretreatment tanks and plating tanks, thereby sequentially forming the intermediate plating layer and the surface layer on the half sliding bearings.Type: GrantFiled: May 27, 1992Date of Patent: April 6, 1993Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Motomu Wada, Hideo Ishikawa
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Patent number: 5185216Abstract: Disclosed is a composite plating film for sliding members, essentially containing at least one of the alloy elements selected from tin, indium, antimony, and copper; inorganic particles; and lead; the composition of the composite plating film being:a) at least one of the alloy elements selected from tin, indium, antimony, and copper . . . 2 to 30 weight % in total;b) inorganic particles . . . 0.3 to 25 volume %; andc) lead . . . the balance.Type: GrantFiled: August 29, 1990Date of Patent: February 9, 1993Assignees: Daido Metal Company Ltd., C. Uyemura & Company, Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Motomu Wada, Hideo Ishikawa, Sowjun Matsumura, Tadashi Chiba, Kiyoshi Asakawa, Syoichi Oohora
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Patent number: 5183637Abstract: A wear-resistant copper alloy containing 1.2 to 8.5% Mn, 0.3 to 2.5% Si, 3.0 to 8.0% Al, 20 to 40% Zn, 0.05% to 1.5% Te, and the balance of Cu and unavoidable impurities. The alloy includes other variations based on by adding (1) 0.5 to 3% Ni, (2) 0.5 to 13% Pb, (3) 0.5 to 3% Ni and 0.5 to 13% Pb or (4) 0.5 to 13% Pb and 0.02 to 1.5% Mg. Lead provides the self-lubricating property to the alloy. Magnesium disperses lead finely and uniformly in the alloy.Type: GrantFiled: February 6, 1992Date of Patent: February 2, 1993Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Tohru Kato
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Patent number: 5162100Abstract: An aluminum-based bearing alloy of the invention comprises 3-40% Sn, 0.1-10% Pb, 0.1-5% Cu, 0.1-3% Sb, total 0.05-1% of Ti and B which satisfy the equation: B/Ti+B=0.1 to 0.35, and the balance being essentially Al. The aluminum-based bearing alloy according to the present invention has excellent fatigue resistance and anti-seizure property.Type: GrantFiled: August 27, 1991Date of Patent: November 10, 1992Assignee: Daido Metal Company, Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Yoshiaki Sato, Tohru Kato
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Patent number: 5141626Abstract: There is disclose a method of an apparatus for surface-treatment of half sliding bearings having a multi-layer construction including a steel backing, a bearing alloy layer of copper alloy or aluminum alloy, an intermediate plating layer and a surface layer. A plurality of half sliding bearings are attached to a support member in such a manner that the half sliding bearings are arranged end-to-end into a semi-cylindrical configuration. The support member is transferred to be sequentially inserted into a plurality of openable and closable plating cases mounted respectively within pretreatment tanks and plating tanks, thereby sequentially forming the intermediate plating layer and the surface layer on the half sliding bearings.Type: GrantFiled: November 28, 1990Date of Patent: August 25, 1992Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Motomu Wada, Hideo Ishikawa
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Patent number: 5128213Abstract: A sliding material of a single substance made by extruding powder comprises aluminum as a main constituent, and at least one metal compound of 0.5 to 30 wt. % in total selected from the group consisting of metal nitride, metal carbide, metal phosphide, and metal boride, each of which has a hardness not less than 200 in Vicker's hardness, the metal compound being uniformly and finely dispersed in aluminum.Type: GrantFiled: September 20, 1991Date of Patent: July 7, 1992Assignee: Daido Metal Company LimitedInventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Yoshiaki Sato
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Patent number: 5116692Abstract: A multi-layer type sliding bearing of aluminum alloy and a method of producing the same are disclosed. The multi-layer type sliding bearing includes a mixture layer which has a thickness of not more than 0.5 microns and which is constituted by a mixture of the constituents of the overlay and one element selected from the group consisting of Ni, Co and Fe. The mixture layer is provided between the overlay and a bearing layer of aluminum alloy. In order to prevent fretting, a 0.1 to 5 micron thick plating layer may be provided on the surface of a backing layer of steel which is located on the rear-face side of the bearing. This plating layer consists of the constituents which are the same as those of the overlay.Type: GrantFiled: June 1, 1989Date of Patent: May 26, 1992Assignee: Daido Metal Company Ltd.Inventors: Sanae Mori, Masaaki Sakamoto, Hideo Ishikawa, Yoji Nagai
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Patent number: 5112416Abstract: Disclosed is an aluminum based alloy bearing having a strengthened intermediate bonding layer, which comprises a backing steel, an intermediate bonding layer and an aluminum based bearing alloy layer. In this alloy bearing, the intermediate bonding layer has a hardness ranging from 40% to 70% of that of the aluminum based bearing alloy layer in terms of Vicker's hardness.Type: GrantFiled: November 13, 1990Date of Patent: May 12, 1992Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Yoshiaki Sato, Tohru Kato
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Patent number: 5074458Abstract: There is disclosed a method of producing a bimetal for use as a material for a plain bearing. A copper alloy powder is placed on a back steel. The back metal and the copper alloy powder are preheated to a temperature near a Curie point of the steel in a reducing atmosphere by high-frequency induction heating. The preheated back steel and copper alloy powder are heated to a temperature of 770.degree. C. to 950.degree. C. in one of an electric resistance furnace and a gas furnace in a reducing atmosphere so that the copper alloy powder is sintered to form a sintered copper alloy layer and at the same time the sintered copper alloy layer is bonded to the back steel, thereby producing the bimetal.Type: GrantFiled: February 15, 1991Date of Patent: December 24, 1991Assignee: Daido Metal Company, Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Hideyuki Kidokoro
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Patent number: 5075177Abstract: An aluminum alloy bearing for use in a low-rigidity housing, includes a bearing aluminum alloy, and a steel back metal bonded to the bearing aluminum alloy. The steel back metal contains 0.16 to 0.35 wt. % of carbon, and the steel back metal has a hardness of Hv 200 to 280 and has an elastic limit of not less than 40 kgf/mm.sup.2. For producing the aluminum alloy bearing, the back metal material is pressure-bonded to the bearing aluminum alloy in such a manner that the rolling reduction of the back metal material is 38 to 50%.Type: GrantFiled: February 15, 1991Date of Patent: December 24, 1991Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Yoshiaki Sato, Tohru Kato
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Patent number: 5056937Abstract: A sliding bearing such as a half sliding bearing, a cylindrical bushing and etc. includes a back metal of a three-layer construction composed of a back metal portion of austenitic stainless steel having a thermal expansion coefficient of not less than 15.times.10.sup.-6 /.degree.C., a plated bonding layer formed on the back metal portion, and a plating layer of Cu or a Cu alloy formed on the bonding layer. An alloy layer made of a copper-lead alloy or a lead-bronze alloy is formed on the back metal. With this construction, the alloy layer is positively bonded to the back metal. The austenitic stainless steel is of such a type that the back metal is less subjected to work hardening, and the austenitic stainless steel contains those components which prevent work-inducing martensite transformation.Type: GrantFiled: December 4, 1990Date of Patent: October 15, 1991Assignee: Daido Metal Company Ltd.Inventors: Tadashi Tanaka, Masaaki Sakamoto, Motomu Wada, Hideyuki Kidokoro, Yoji Nagai
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Patent number: 5041339Abstract: A multilayered sliding material of lead bronze containing graphite in the form of a bimetal, comprising a steel plate or a steel plate having a copper plating coating and a sintered copper alloy bonded to the steel plate, the sintered copper alloy having a composition consisting of 5 to 16 wt % Sn, 2 to 20 wt % Pb, 0.03 to 1 wt % P, 0.5 to 3.9 wt % graphite, and the balance Cu, wherein hardness of the alloy exceeds Hv 100.Type: GrantFiled: August 21, 1989Date of Patent: August 20, 1991Assignee: Daido Metal CompanyInventors: Sanae Mori, Masaaki Sakamoto, Koichi Yamamoto, Kenji Sakai