Patents by Inventor Tsuneo Maruyama

Tsuneo Maruyama 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).

  • Publication number: 20190232374
    Abstract: A die having a cavity and a lower punch fitted into the cavity. The cavity is divided and the parts slide along a division plane passing through the cavity parallel to the fitting direction of the die and the lower punch. The divided cavity parts are placed in a state of alignment along the division plane. The divided cavity parts are each filled with raw material powder. The die and the lower punch are then slid along the division plane, whereby the divided cavity parts are combined as the original cavity. The raw material powder in the cavity in a combined state is compressed by an upper punch and the lower punch.
    Type: Application
    Filed: August 10, 2017
    Publication date: August 1, 2019
    Applicant: DIAMET CORPORATION
    Inventors: Tsuneo MARUYAMA, Shinich TAKEZOE, Hideo SAKAI
  • Publication number: 20190203321
    Abstract: Provided is a Cu-based sintered bearing comprising: 15-36 mass % of Ni; 3-13 mass % of Sn; 0.05-0.55 mass % of P; and 0.02-4 mass % of C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu-Ni-based main phase grains is 0.02-0.10 mass %.
    Type: Application
    Filed: March 6, 2019
    Publication date: July 4, 2019
    Inventors: Yoshinari ISHII, Shinichi TAKEZOE, Tsuneo MARUYAMA
  • Publication number: 20190091767
    Abstract: A molding die includes a first die having a through-hole; a second die inserted into the through-hole and configured to be movable relative to the first die; and first and second punches configured to be insertable into the through-hole, wherein an undercut molding part is provided on the second die, and a molding target is compression-molded in a cavity surrounded by inner side walls of the through-hole, the second die, the first punch, and the second punch.
    Type: Application
    Filed: March 3, 2017
    Publication date: March 28, 2019
    Applicant: Diamet Corporation
    Inventors: Tsuneo MARUYAMA, Yoshiki TAMURA, Hideo SAKAI
  • Publication number: 20190055984
    Abstract: This sintered sliding material has a composition including, by mass %, 10% to 35% of Ni, 5% to 12% of Sn, 0% to 0.9% of P, and 4.1% to 9% of C, with a remainder of Cu and inevitable impurities, wherein the sintered sliding material includes a sintered body of a plurality of Cu—Ni alloy grains containing Sn and C, the sintered sliding material has a structure in which pores are dispersedly formed in grain boundaries of the plurality of alloy grains and free graphite is distributed in the pores, and an amount of C in a metal matrix including the alloy grains is, by mass %, 0% to 0.07%.
    Type: Application
    Filed: March 2, 2017
    Publication date: February 21, 2019
    Applicant: Diamet Corporation
    Inventors: Yoshinari ISHII, Tsuneo MARUYAMA, Shinichi TAKEZOE
  • Patent number: 9849511
    Abstract: A Cu-based sintered sliding member that can be used under high-load conditions. The sliding member is age-hardened, including 5 to 30 mass % Ni, 5 to 20 mass % Sn, 0.1 to 1.2 mass % P, and the rest including Cu and unavoidable impurities. In the sliding member, an alloy phase containing higher concentrations of Ni, P and Sn than their average concentrations in the whole part of the sliding member, is allowed to be present in a grain boundary of a metallic texture, thereby achieving excellent wear resistance. Hence, without needing expensive hard particles, there can be obtained, at low cost, a Cu-based sintered sliding member usable under high-load conditions. Even more excellent wear resistance is achieved by containing 0.3 to 10 mass % of at least one solid lubricant selected from among graphite, graphite fluoride, molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: December 26, 2017
    Assignee: DIAMET CORPORATION
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Publication number: 20170283911
    Abstract: Provided is a Cu-based sintered bearing comprising: 15-36 mass % of Ni; 3-13 mass % of Sn; 0.05-0.55 mass % of P; and 0.02-4 mass % of C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu—Ni-based main phase grains is 0.02-0.10 mass %.
    Type: Application
    Filed: September 4, 2015
    Publication date: October 5, 2017
    Applicant: Diamet Corporation
    Inventors: Yoshinari ISHII, Shinichi TAKEZOE, Tsuneo MARUYAMA
  • Patent number: 9017599
    Abstract: There is provided a sliding part in which a surface coverage ratio of copper in the sliding part increases. A bearing which is the sliding part is formed by filling the raw powder into the filling portion of the forming mold, compacting the raw powder to form a powder compact, which is sintered. A copper-based raw powder is composed of a copper-based flat raw powder whose diameter is smaller than that of an iron-based raw powder and an aspect ratio larger than that of the iron-based raw powder, and a copper-based small-sized raw powder whose diameter is smaller than that of the copper-based flat raw powder. The copper is allowed to segregate at the surface of the sliding part. The surface of the bearing is covered with the copper-based small-sized raw powder and the copper-based flat raw powder, thereby the surface coverage ratio of copper can be increased.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: April 28, 2015
    Assignee: Diamet Corporation
    Inventors: Teruo Shimizu, Tsuneo Maruyama
  • Patent number: 8999232
    Abstract: There is provided a bearing for motor-powered fuel injection pumps, made from Cu—Ni-based sintered alloy, which is able to be obtained at a low cost, having excellent corrosion and abrasion resistances. The bearing contains 10 to 20% by mass of Ni, 5 to 13% by mass of Sn, 0.1 to 0.8% by mass of P, 1 to 6% by mass of C, and a remainder containing Cu and inevitable impurities, and is formed with a Ni—Sn—Cu—P phase containing at least 30% by mass of Sn in a grain boundary, and has a 8 to 18% porosity. The Ni—Sn—Cu—P phase contains 30 to 49% by mass of Ni, 10 to 30% by mass of Cu, 0.5 to 1.5% by mass of P, and a remainder containing Sn and inevitable impurities.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: April 7, 2015
    Assignee: Diamet Corporation
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Publication number: 20150037196
    Abstract: A Cu-based sintered sliding member that can be used under high-load conditions. The sliding member is age-hardened, including 5 to 30 mass % Ni, 5 to 20 mass % Sn, 0.1 to 1.2 mass % P, and the rest including Cu and unavoidable impurities. In the sliding member, an alloy phase containing higher concentrations of Ni, P and Sn than their average concentrations in the whole part of the sliding member, is allowed to be present in a grain boundary of a metallic texture, thereby achieving excellent wear resistance. Hence, without needing expensive hard particles, there can be obtained, at low cost, a Cu-based sintered sliding member usable under high-load conditions. Even more excellent wear resistance is achieved by containing 0.3 to 10 mass % of at least one solid lubricant selected from among graphite, graphite fluoride, molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders.
    Type: Application
    Filed: October 22, 2014
    Publication date: February 5, 2015
    Applicant: DIAMET CORPORATION
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Patent number: 8726515
    Abstract: An oil-impregnated sintered which does not damage rotating shaft and itself and has a high durability even in the case that the rotating shaft is inclined in the bearing by a large shear load applied thereto, and a method of manufacturing an oil-impregnated sintered bearing which exhibits center deviation-suppressing action of the bearing satisfactorily by accurately forming a bearing hole in an intermediate completely sintered are disclosed.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: May 20, 2014
    Assignee: Diamet Corporation
    Inventors: Tsuneo Maruyama, Teruo Shimizu
  • Patent number: 8709124
    Abstract: There is provided a novel sintered sliding member superior in thermal resistance, corrosion resistance and wear resistance. The sintered sliding member of the present invention includes 7.7-30.3% Cu, 2.0-20.0% Sn and 0.3-7.0% boron nitride by mass, with a remainder composed of Ni and unavoidable impurities. The sintered sliding member may further include 0.1-3.0% C or 0.1-0.7% P. A porosity of the sintered sliding member is 5-25%.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: April 29, 2014
    Assignee: Diamet Corporation
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Publication number: 20130189150
    Abstract: There is provided a bearing for motor-powered fuel injection pumps, made from Cu—Ni-based sintered alloy, which is able to be obtained at a low cost, having excellent corrosion and abrasion resistances. The bearing contains 10 to 20% by mass of Ni, 5 to 13% by mass of Sn, 0.1 to 0.8% by mass of P, 1 to 6% by mass of C, and a remainder containing Cu and inevitable impurities, and is formed with a Ni—Sn—Cu—P phase containing at least 30% by mass of Sn in a grain boundary, and has a 8 to 18% porosity. The Ni—Sn—Cu—P phase contains 30 to 49% by mass of Ni, 10 to 30% by mass of Cu, 0.5 to 1.5% by mass of P, and a remainder containing Sn and inevitable impurities.
    Type: Application
    Filed: November 7, 2011
    Publication date: July 25, 2013
    Applicant: DIAMET CORPORATION
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Patent number: 8449815
    Abstract: There is provided an oil-impregnated sintered bearing which enable to prevent oil leakage from an outer peripheral surface of an bearing body. The oil-impregnated sintered bearing includes a bearing body which is made of a porous sintered alloy containing vacancies and has a bearing hole in which a rotary shaft can be inserted, wherein the vacancies opened on an outer peripheral surface of the bearing body are crushed. The vacancies may be crushed in the state of a green compact, or in the state of a sintered alloy after sintering the green compact. Consequently, the oil leakage from the outer peripheral surface of the bearing can be prevented, and oil pressure in the bearing hole can be preserved.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: May 28, 2013
    Assignee: Diamet Corporation
    Inventors: Teruo Shimizu, Tsuneo Maruyama
  • Publication number: 20130104400
    Abstract: An oil-impregnated sintered which does not damage rotating shaft and itself and has a high durability even in the case that the rotating shaft is inclined in the bearing by a large shear load applied thereto, and a method of manufacturing an oil-impregnated sintered bearing which exhibits center deviation-suppressing action of the bearing satisfactorily by accurately forming a bearing hole in an intermediate completely sintered are disclosed.
    Type: Application
    Filed: November 14, 2012
    Publication date: May 2, 2013
    Applicant: Diamet Corporation
    Inventors: Tsuneo MARUYAMA, Teruo Shimizu
  • Patent number: 8360648
    Abstract: An oil-impregnated sintered which does not damage rotating shaft and itself and has a high durability even in the case that the rotating shaft is inclined in the bearing by a large shear load applied thereto, and a method of manufacturing an oil-impregnated sintered bearing which exhibits center deviation-suppressing action of the bearing satisfactorily by accurately forming a bearing hole in an intermediate completely sintered are disclosed.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: January 29, 2013
    Assignee: Diamet Corporation
    Inventors: Tsuneo Maruyama, Teruo Shimizu
  • Publication number: 20120244029
    Abstract: There is provided a sliding part in which a surface coverage ratio of copper in the sliding part increases. A bearing which is the sliding part is formed by filling the raw powder into the filling portion of the forming mold, compacting the raw powder to form a powder compact, which is sintered. A copper-based raw powder is composed of a copper-based flat raw powder whose diameter is smaller than that of an iron-based raw powder and an aspect ratio larger than that of the iron-based raw powder, and a copper-based small-sized raw powder whose diameter is smaller than that of the copper-based flat raw powder. The copper is allowed to segregate at the surface of the sliding part. The surface of the bearing is covered with the copper-based small-sized raw powder and the copper-based flat raw powder, thereby the surface coverage ratio of copper can be increased.
    Type: Application
    Filed: June 1, 2012
    Publication date: September 27, 2012
    Applicant: Mitsubishi Materials PMG Corporation
    Inventors: Teruo Shimizu, Tsuneo Maruyama
  • Publication number: 20120204677
    Abstract: There is provided a novel sintered sliding member superior in thermal resistance, corrosion resistance and wear resistance. The sintered sliding member of the present invention includes 7.7-30.3% Cu, 2.0-20.0% Sn and 0.3-7.0% boron nitride by mass, with a remainder composed of Ni and unavoidable impurities. The sintered sliding member may further include 0.1-3.0% C or 0.1-0.7% P. A porosity of the sintered sliding member is 5-25%.
    Type: Application
    Filed: December 7, 2010
    Publication date: August 16, 2012
    Applicant: Diamet Corporation
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Publication number: 20120145284
    Abstract: A Cu-based sintered sliding member that can be used under high-load conditions. The sliding member is age-hardened, including 5 to 30 mass % Ni, 5 to 20 mass % Sn, 0.1 to 1.2 mass % P, and the rest including Cu and unavoidable impurities. In the sliding member, an alloy phase containing higher concentrations of Ni, P and Sn than their average concentrations in the whole part of the sliding member, is allowed to be present in a grain boundary of a metallic texture, thereby achieving excellent wear resistance. Hence, without needing expensive hard particles, there can be obtained, at low cost, a Cu-based sintered sliding member usable under high-load conditions. Even more excellent wear resistance is achieved by containing 0.3 to 10 mass % of at least one solid lubricant selected from among graphite, graphite fluoride, molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders.
    Type: Application
    Filed: August 27, 2010
    Publication date: June 14, 2012
    Applicant: Diamet Corporation
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Patent number: 8167971
    Abstract: A sliding part in which a surface coverage ratio of copper in the sliding part increases. A bearing which is the sliding part is formed by filling the raw powder into the filling portion of the forming mold, compacting the raw powder to form a powder compact, and sintering the powder compact. A copper-based raw powder is composed of a copper-based flat raw powder having an average diameter smaller than that of an iron-based raw powder and an aspect ratio larger than that of the iron-based raw powder, and a copper-based small-sized raw powder having the average diameter is smaller than that of the copper-based flat raw powder. The copper segregates at the surface of the sliding part. In the bearing in which the copper-based flat powder segregates at the surface, the surface is covered with the copper-based small-sized raw powder that has emerged on the surface, as well as the copper-based flat raw powder, thereby it is possible to increase the surface coverage ratio of copper.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: May 1, 2012
    Assignee: Diamet Corporation
    Inventors: Teruo Shimizu, Tsuneo Maruyama
  • Patent number: 8092091
    Abstract: A bearing with strength and abrasion resistance for a flow rate control valve of an exhaust gas recirculation system of an internal combustion engine. By using a sintered Cu alloy with a composition consisting of, by mass %, Ni: 10 to 30%, Sn: 5 to 12%, C: 3 to 10%, P: 0.1 to 0.9% and Cu and inevitable impurities as the balance, the bearing exhibits a thermal expansion coefficient corresponding to that of a shaft made of austenitic stainless steel. As a result, a bearing with strength and abrasion resistance under high temperature conditions is obtained.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: January 10, 2012
    Assignee: Diamet Corporation
    Inventors: Teruo Shimizu, Tsuneo Maruyama