Patents Assigned to Diamet Corporation
  • Patent number: 11183321
    Abstract: The present invention relates to a powder magnetic core with silica-based insulating film having a structure in which a plurality of Fe-based soft magnetic powder particles having surfaces coated with a silica-based insulating film are joined with each other through a grain boundary layer made of the silica-based insulating film. Fe diffused from the Fe-based soft magnetic powder particles is contained in the grain boundary layer and the grain boundary layer contains an oxide of each of Fe and Si or a composite oxide of Fe and Si.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: November 23, 2021
    Assignee: Diamet Corporation
    Inventors: Hiroaki Ikeda, Kazunori Igarashi
  • 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: 10941465
    Abstract: The Cu-based sintered sliding material has a composition including, by mass %, 7% to 35% of Ni, 1% to 10% of Sn, 0.9% to 3% of P, and 0.5% to 5% of C, with a remainder of Cu and inevitable impurities, wherein the Cu-based sintered sliding material includes a sintered body including: alloy grains that contain Sn and C and contain a Cu—Ni-based alloy as a main component; grain boundary phases that contain Ni and P as main components and are dispersedly distributed in grain boundaries of the alloy grains; and free graphite that intervenes at the grain boundaries of the alloy grains, the Cu-based sintered sliding material has a structure in which pores are dispersedly formed in the grain boundaries of the alloy grains, and an amount of C in a metal matrix including the alloy grains and the grain boundary phases is, by mass %, 0.02% to 0.20%.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: March 9, 2021
    Assignee: Diamet Corporation
    Inventor: Yoshinari Ishii
  • Patent number: 10865828
    Abstract: An oil-impregnated sintered bearing in which a Fe—Cu-based sintered body is impregnated with a lubricant and which has a bearing hole that is configured to support a rotary shaft inserted therethrough, in which an inner circumferential surface of the bearing hole includes at least a first region including a central portion in a shaft direction and a second region forming a portion from a first end portion of the first region to a first opening of the bearing hole, and, in a friction surface of the second region, an area of a Fe phase is larger and an area of a Cu phase formed of Cu powder including Cu-based flat raw material powder is smaller than those in a friction surface of the first region.
    Type: Grant
    Filed: October 26, 2017
    Date of Patent: December 15, 2020
    Assignee: Diamet Corporation
    Inventors: Yoshiki Tamura, Shinichi Takezoe
  • 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: 10731704
    Abstract: The oil-impregnated sintered bearing of the present invention is an oil-impregnated sintered bearing having a Fe—Cu-based sintered body being impregnated with, a bearing hole being formed in the Fe—Cu-based sintered body and configured to be penetrated by and support a rotating shaft, in which an inner circumferential surface of the bearing hole includes a first region forming a central portion in a shaft direction, a second region from a first end portion of the first region to a first opening of the bearing hole, and a third region from a second end portion of the first region to a second opening of the bearing hole, and an area ratio of the Cu phase of the second region in a center along the shaft direction is 80% or more and 100% or less of an area ratio of the Cu phase of the third region in a center along the shaft direction.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: August 4, 2020
    Assignee: Diamet Corporation
    Inventors: Yoshiki Tamura, Hideo Sakai, Osamu Sakai
  • Patent number: 10697495
    Abstract: A sintered bearing exhibits a less of a hard iron alloy phase, and has an excellent wear resistance and cost performance under low-revolution and high-load use conditions. The sintered bearing contains Cu: 10 to 55% by mass, Sn: 0.5 to 7% by mass, Zn: 0 to 4% by mass, P: 0 to 0.6% by mass, C: 0.5 to 4.5% by mass and a remainder composed of Fe and inevitable impurities. An area ratio of a free graphite dispersed in a metal matrix of the bearing is 5 to 35%; an area ratio of a copper phase in the metal matrix of a bearing surface is not less than 30%; a porosity thereof is 16 to 25%; a hardness of an iron alloy phase in the matrix is Hv 65 to 200; and raw material powders employ at least one of a crystalline graphite powder and a flake graphite powder each having an average particle size of 10 to 100 ?m.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: June 30, 2020
    Assignee: Diamet Corporation
    Inventors: Yoshinari Ishii, Yasuhiro Tsukada, Tomoe Obata
  • 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
  • Patent number: 10683568
    Abstract: An object of this heat-resistant sintered material and a production method therefor is to obtain a heat-resistant sintered material having excellent oxidation resistance, high-temperature wear resistance and salt damage resistance. This heat-resistant sintered material has a composition containing, in mass % values, Cr: 25 to 50%, Ni: 2 to 25% and P: 0.2 to 1.2%, with the remainder being Fe and unavoidable impurities, and has a structure including an Fe—Cr matrix, and a hard phase composed of Cr—Fe alloy particles dispersed within the Fe—Cr matrix, wherein the Cr content of the Fe—Cr matrix is from 24 to 41 mass %, the Cr content of the hard phase is from 30 to 61 mass %, and the effective porosity is 2% or less.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: June 16, 2020
    Assignee: Diamet Corporation
    Inventors: Kenichi Kato, Tatsuki Mizuno, Masahisa Miyahara
  • 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
  • Patent number: 10618099
    Abstract: In a die for compressing and sizing a sintered body at straight portions, upper taper portions are provided on a die upper portion and a core rod upper portion, and the straight portions are provided at a die lower portion and a core rod lower portion. The die upper portion and the core rod upper portion have Young's moduli higher than the die lower portion and the core rod lower portion. The die upper portion and the core rod upper portion are made of materials having Young's moduli that are at least 50 GPa higher than that of the sintered body. The sintered body can be densified with a smaller ironing margin. Since the sintered body is ironed without being compressed, by the upper taper portions and the core rod upper portion having high Young's moduli, the die is prevented from breaking and being abraded due to ironing.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: April 14, 2020
    Assignee: Diamet Corporation
    Inventors: Takashi Nakai, Kinya Kawase
  • Publication number: 20200095662
    Abstract: This heat-resistant sintered material has, as an overall composition, a composition including, in terms of % by mass, Cr: 15% to 30%, Ni: 8% to 30%, Si: 2.0% to 6.0%, and C: 0.5% to 2.5% with a remainder being Fe and inevitable impurities, wherein the heat-resistant sintered material has a structure in which hard phases are dispersed in a matrix, the matrix includes Fe, Cr, Ni, and Si, the hard phase includes Fe, Cr, and C, and a porosity is 2.0% or less.
    Type: Application
    Filed: March 26, 2018
    Publication date: March 26, 2020
    Applicant: Diamet Corporation
    Inventors: Ryosuke FUKUDA, Masahisa MIYAHARA
  • Patent number: 10570959
    Abstract: An oil-retaining sintered bearing in which friction coefficient can be reduced and a sliding property as a bearing can be improved by supplying a sufficient amount of oil to a sliding surface and preventing the supplied oil from moving to an interior from the sliding surface; a sliding surface 3 supporting an outer peripheral surface of a shaft and a helical oiling surface 4 around a shaft axis of a bearing hole are adjacently formed on an inner peripheral surface of the bearing hole into which the shaft is inserted; a surface open rate at the sliding surface 3 is not larger than 10%; and a surface open rate at the oiling surface exceeds 10%.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: February 25, 2020
    Assignees: MITSUBISHI MATERIALS CORPORATION, DIAMET CORPORATION
    Inventors: Hajime Kouno, Yoshinari Ishii, Jyun Katou
  • Publication number: 20200049198
    Abstract: The oil-impregnated sintered bearing of the present invention is an oil-impregnated sintered bearing having a Fe—Cu-based sintered body being impregnated with, a bearing hole being formed in the Fe—Cu-based sintered body and configured to be penetrated by and support a rotating shaft, in which an inner circumferential surface of the bearing hole includes a first region forming a central portion in a shaft direction, a second region from a first end portion of the first region to a first opening of the bearing hole, and a third region from a second end portion of the first region to a second opening of the bearing hole, and an area ratio of the Cu phase of the second region in a center along the shaft direction is 80% or more and 100% or less of an area ratio of the Cu phase of the third region in a center along the shaft direction.
    Type: Application
    Filed: October 18, 2017
    Publication date: February 13, 2020
    Applicant: Diamet Corporation
    Inventors: Yoshiki TAMURA, Hideo SAKAI, Osamu SAKAI
  • Publication number: 20200016662
    Abstract: An oil-impregnated sintered bearing in which a Fe—Cu-based sintered body is impregnated with a lubricant and which has a bearing hole that is configured to support a rotary shaft inserted therethrough, in which an inner circumferential surface of the bearing hole includes at least a first region including a central portion in a shaft direction and a second region forming a portion from a first end portion of the first region to a first opening of the bearing hole, and, in a friction surface of the second region, an area of a Fe phase is larger and an area of a Cu phase formed of Cu powder including Cu-based flat raw material powder is smaller than those in a friction surface of the first region.
    Type: Application
    Filed: October 26, 2017
    Publication date: January 16, 2020
    Applicant: Diamet Corporation
    Inventors: Yoshiki TAMURA, Shinichi TAKEZOE