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).

  • Patent number: 11073178
    Abstract: An oil-impregnated sintered bearing comprises a bearing hole. In the bearing, sliding surfaces supporting an outer circumferential surface of a shaft and an oil supply surface whose diameter is larger than that of the sliding surfaces are formed on an inner circumferential surface of the bearing hole into which the shaft is inserted. The sliding surfaces and the oil supply surfaces are adjacent to each other in the axial direction of the bearing hole. A height gap “d1” between the sliding surfaces and the oil supply surface is not less than 0.01% and not more than 15% of an inner diameter of the sliding surfaces. A surface opening percentage of the sliding surfaces is not higher than 10%. A surface opening percentage of the oil supply surface is higher than 10%. An average circle-equivalent diameter of opening parts of pores on the sliding surfaces is not larger than 20 ?m.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: July 27, 2021
    Assignee: DIAMET CORPORATION
    Inventors: Hajime Kouno, Yoshinari Ishii, Tsuneo Maruyama, Jyun Katou, Kenji Orito
  • Publication number: 20210190145
    Abstract: A sintered bearing includes a bearing main body which has a substantially cylindrical shape and is made of a sintered material, a through-hole being formed in a center of the bearing main body; a sealing member in a disk shape, the sealing member being configured to be disposed such that one surface side of the sealing member is in contact with the bearing main body, and an opening being formed in a center of the sealing member; and a locking member in a block shape, the locking member being configured to be in contact with at least another surface side of the sealing member and holding the sealing member between the locking member and the bearing main body.
    Type: Application
    Filed: April 15, 2019
    Publication date: June 24, 2021
    Applicant: Diamet Corporation
    Inventors: Tsuneo MARUYAMA, Yoshinari ISHII
  • Publication number: 20210131494
    Abstract: Provided is a bearing for a motor-type fuel injection pump. This bearing is composed of a Cu—Ni-based sintered alloy, inexpensive and has a superior corrosion resistance and abrasion resistance. The bearing contains 10 to 20% by mass of Ni, 2 to 4.5% by mass of Sn, 0.05 to 0.4% by mass of P, 2 to 7% by mass of C, and a remainder consisting of Cu and inevitable impurities. The bearing has a metal structure where Sn is uniformly dispersed and distributed in a metal matrix, and has a porosity of 7 to 17% where a free graphite is dispersed and distributed in pores.
    Type: Application
    Filed: June 28, 2018
    Publication date: May 6, 2021
    Applicant: DIAMET CORPORATION
    Inventors: Tsuneo MARUYAMA, Yoshinari ISHII
  • Patent number: 10843264
    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: Grant
    Filed: March 3, 2017
    Date of Patent: November 24, 2020
    Assignee: Diamet Corporation
    Inventors: Tsuneo Maruyama, Yoshiki Tamura, Hideo Sakai
  • Publication number: 20200325934
    Abstract: On an inner peripheral surface of a bearing hole into which a shaft is inserted, concave oil supply surfaces arranged dispersively like separated islands and a sliding surface continuous around the oil supply surfaces to hold an outer peripheral surface of the shaft are formed: a maximum height difference between the sliding surface and the oil supply surfaces is not less than 0.01% and not more than 0.5% of an inner diameter Di of the sliding surface; a surface aperture area ratio of pores at the sliding surface is not more than 10%; a surface aperture area ratio of pores at the oil supply surfaces is more than 10% and less than 40%; and an area of each of the oil supply surfaces is not less than 0.03 mm2 and not more than 0.2×Di2 (mm2).
    Type: Application
    Filed: November 14, 2018
    Publication date: October 15, 2020
    Applicants: MITSUBISHI MATERIALS CORPORATION, DIAMET CORPORATION
    Inventors: Hajime Kouno, Yoshinari Ishii, Tsuneo Maruyama, Jyun Katou, Kenji Orito
  • Patent number: 10745780
    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: Grant
    Filed: September 4, 2015
    Date of Patent: August 18, 2020
    Assignee: Diamet Corporation
    Inventors: Yoshinari Ishii, Shinichi Takezoe, Tsuneo Maruyama
  • Patent number: 10683566
    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: Grant
    Filed: September 4, 2015
    Date of Patent: June 16, 2020
    Assignee: Diamet Corporation
    Inventors: Yoshinari Ishii, Shinichi Takezoe, Tsuneo Maruyama
  • Publication number: 20200180032
    Abstract: Provided is a novel sintered oil-impregnated bearing superior in wear resistance and cost performance under a severe use condition where the bearing collides with a shaft due to a high load and vibration, such as a condition associated with an output shaft of an electric motor installed in a vehicle and a wiper motor installed therein. The sintered oil-impregnated bearing contains: 15 to 30% by mass of Cu; 1 to 4% by mass of C; and a remainder consisting of Fe and inevitable impurities, in which a metal structure with copper being melted therein is provided at least on a bearing surface; pearlite or a pearlite with ferrite being partially scattered therein is provided in a matrix; a copper-rich phase arranged in a mesh-like manner is also provided in the matrix; and a free graphite is dispersed and distributed in the matrix as well.
    Type: Application
    Filed: September 20, 2018
    Publication date: June 11, 2020
    Applicant: Diamet Corporation
    Inventors: Yoshinari ISHII, Tsuneo MARUYAMA
  • Patent number: 10654104
    Abstract: A sintered bearing comprises: a bearing sleeve that is formed of a sintered material and has a shaft hole; an annular ring-shaped seal member that is disposed such that one surface thereof comes into contact with the bearing sleeve; and a washer member that comes into contact with the other surface of the seal member on a side opposite to the one surface and is configured for the seal member to engage with the bearing sleeve. The washer member is fixed to the bearing sleeve.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: May 19, 2020
    Assignees: Diamet Corporation, MITSUBISHI CABLE INDUSTRIES, LTD.
    Inventors: Tsuneo Maruyama, Yoshinari Ishii, Nobukazu Fujii, Takayuki Suenaga
  • Publication number: 20190366440
    Abstract: A sintered bearing comprises: a bearing sleeve that is formed of a sintered material and has a shaft hole; an annular ring-shaped seal member that is disposed such that one surface thereof comes into contact with the bearing sleeve; and a washer member that comes into contact with the other surface of the seal member on a side opposite to the one surface and is configured for the seal member to engage with the bearing sleeve. The washer member is fixed to the bearing sleeve.
    Type: Application
    Filed: November 16, 2017
    Publication date: December 5, 2019
    Applicants: Diamet Corporation, MITSUBISHI CABLE INDUSTRIES, LTD.
    Inventors: Tsuneo MARUYAMA, Yoshinari ISHII, Nobukazu FUJII, Takayuki SUENAGA
  • Publication number: 20190360528
    Abstract: In order to supply sufficient amount of oil to one or more sliding surfaces and to prevent the supplied oil from moving from the sliding surface(s) to an inside so as to achieve lower friction and improve sliding performance of a bearing, in an oil-impregnated sintered bearing 1, sliding surfaces 3 supporting an outer circumferential surface of a shaft 11 and an oil supply surface 4 in which a diameter is larger than that of the sliding surfaces 3 are formed on an inner circumferential surface of a bearing hole 2 into which the shaft 11 is inserted, to be adjacent in an axial direction of the bearing hole 2, a height gap “d1” between the sliding surfaces 3 and the oil supply surface 4 is not less than 0.
    Type: Application
    Filed: December 20, 2017
    Publication date: November 28, 2019
    Applicants: MITSUBISHI MATERIALS CORPORATION, DIAMET CORPORATION
    Inventors: Hajime Kouno, Yoshinari Ishii, Tsuneo Maruyama, Jyun Katou, Kenji Orito
  • Publication number: 20190344349
    Abstract: The molding die of the invention includes: a first die having a through-hole; a second die inserted into the through-hole and capable of moving relative to the first die; and a first punch and a second punch each insertable into the through-hole. A cavity surrounded by the second die, the first punch, and the second punch to compression-mold a molding object is formed in the through-hole. An undercut molding part is formed in the surface of the second die facing the cavity. The second die is formed so as to be splittable into two or more split bodies.
    Type: Application
    Filed: August 15, 2017
    Publication date: November 14, 2019
    Applicant: Diamet Corporation
    Inventors: Tsuneo MARUYAMA, Yoshiki TAMURA, Hideo SAKAI
  • 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