Patents by Inventor Kenji Imanishi

Kenji Imanishi 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: 20230089505
    Abstract: An eddy current deceleration device includes a rotor and a stator. The rotor includes a hub, a rotor body, and a spoke. The spoke has neutral axes. The first neutral axis is a neutral axis when the spoke is bent in a circumferential direction of the rotor body. The first neutral axis is positioned forward in a rotating direction of the rotor with respect to a center line of the spoke in the circumferential direction. The second neutral axis is a neutral axis when the spoke is bent in an axial direction of the rotor body. The second neutral axis is positioned on a rotor body side with respect to a center line of the spoke in the axial direction.
    Type: Application
    Filed: February 10, 2021
    Publication date: March 23, 2023
    Inventors: Yasutaka NOGUCHI, Hiroshi NOGAMI, Kenji IMANISHI, Takuya FUJITA, Yozo OKUDA
  • Patent number: 11485392
    Abstract: An eddy-current rail brake device includes a row of magnets, a supporting member, a case, and a lifting device. The row of magnets includes a plurality of permanent magnets that are arranged in a traveling direction of a railroad car. To the supporting member, the row of magnets is mounted. The supporting member has magnetism. The case houses the row of magnets and the supporting member and includes a bottom portion that faces the row of magnets and is non-magnetic. The lifting device raises and lowers the supporting member inside the case while the row of magnets is kept facing the bottom portion. The eddy-current rail brake device can prevent or reduce adhesion of a foreign object and can be reduced in size in a right-left direction.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: November 1, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shotaro Kadokawa, Kenji Imanishi, Hiroshi Nogami
  • Patent number: 11420472
    Abstract: In a pressing step, a first forged product is pressed by a first die, and thereby, a second forged product including a rough flange having a thickness-changing portion is produced. The thickness-changing portion includes a front part protruding frontward from a side of a rough web part and a rear part protruding rearward from the side of the rough web part. Each of the front part and the rear part includes a first part, and a second part that is thicker than the first part and is located farther from the rough web part than the first part. In the pressing step, at least a part of the rough flange that is above or below the web part (thick part) is pressed by the first die, whereby the material of the first forged product in the part is caused to flow frontward and rearward, and the thickness-changing portion is formed.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: August 23, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kenji Tamura, Kenji Imanishi, Sam Soo Hwang, Kunihiro Yabuno, Kunihiro Yoshida, Koichiro Ishihara
  • Patent number: 11390116
    Abstract: The production method disclosed is a method for producing a front axle beam. The production method includes a die forging step and a bending step. The die forging step is a step of forging a steel material with dies to produce a forged product including a rough web part, which is to be formed into a web part, and four plate-shaped rough flange parts protruding frontward and rearward from an upper side and a lower side of the rough web part, respectively. The bending step is a step of pressing at least one specified rough flange part, which is at least one of the four rough flange parts, with a first die to form a bent portion in the specified rough flange part such that the bent portion is bent inward in an up-down direction of the forged product.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: July 19, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kenji Tamura, Kenji Imanishi, Sam Soo Hwang, Kunihiro Yabuno, Kunihiro Yoshida, Koichiro Ishihara
  • Publication number: 20220216741
    Abstract: A cylindrical part of a rotor for an eddy current deceleration device of the present embodiment has a chemical composition consisting of, by mass %, C: 0.05 to 0.15%, Si: 0.10 to 0.40%, Mn: 0.50 to 1.00%, P: 0.030% or less, S: 0.030% or less, Mo: 0.20 to 1.00%, Nb: 0.020 to 0.060%, V: 0.040 to 0.080%, sol. Al: 0.030 to 0.100%, B: 0.0005 to 0.0050%, N: 0.003 to 0.010%, Cu: 0 to 0.20%, Ni: 0 to 0.20%, Cr: 0 to 0.10%, and the balance: Fe and impurities, and in which the total area fraction of martensite and bainite in a microstructure is more than 95.0%, and the number density of carbides having an equivalent circular diameter of 100 to 500 nm is 0.35 to 0.75 particles/?m2.
    Type: Application
    Filed: April 21, 2020
    Publication date: July 7, 2022
    Inventors: Nao OTAKI, Hirokazu OKADA, Yasutaka NOGUCHI, Kenji IMANISHI, Masahiro TASAKA
  • Patent number: 11255407
    Abstract: An eddy current damper includes a screw shaft, first permanent magnets, second permanent magnets, a cylindrical magnet holding member, a cylindrical conductive member, and a ball nut meshing with a screw shaft. The screw shaft is movable in the axial direction. The first permanent magnets are arrayed along the circumferential direction around the screw shaft. The second permanent magnet is arranged between the first permanent magnets, wherein the arrangement of magnet poles is inverted between the second permanent magnet and the first permanent magnet. The magnet holding member holds the first permanent magnet and the second permanent magnet. The conductive member is opposed to the first permanent magnets and the second permanent magnets with a gap therebetween. The ball nut is disposed inside the magnet holding member and the conductive member, and is fixed to the magnet holding member or the conductive member.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: February 22, 2022
    Assignees: Nippon Steel Corporation, Aseismic Devices Co., Ltd.
    Inventors: Kenji Imanishi, Hiroyuki Yamaguchi, Ryohsuke Masui, Shigeki Nakaminami, Hidenori Kida
  • Publication number: 20210363771
    Abstract: An eddy current damper includes a magnet holding member, a first permanent magnet having a thickness (H1), a second permanent magnet having a thickness (H1), a conductive member, a ball nut, a screw shaft, and a copper layer having a thickness (H2). The second permanent magnet is adjacent to the first permanent magnets with a gap therebetween in the circumferential direction of the magnet holding member. The ball nut is fixed to the magnet holding member or the conductive member. The copper layer is fixed to the conductive member and is opposed to the first permanent magnet and the second permanent magnet with a gap therebetween. The thickness (H1) and the thickness (H2) satisfy, with respect to a distance (R1) between a central axis of the screw shaft and the center of gravity of the first permanent magnet: 0.018?H1/R1?0.060, and 0.0013?H2/R1?0.0065.
    Type: Application
    Filed: November 2, 2018
    Publication date: November 25, 2021
    Inventors: Hiroshi NOGAMI, Kenji IMANISHI, Yasutaka NOGUCHI, Ryohsuke MASUI, Kumpei SANO
  • Patent number: 11165326
    Abstract: A decelerating apparatus includes a brake member, primary and secondary permanent magnets and pole pieces. The primary permanent magnets are arranged in a circumferential direction to face an inner or outer peripheral surface of the brake member with a gap in between. Each of the primary permanent magnets has two opposite magnetic poles arranged in a radial direction. The secondary permanent magnets and the pole pieces are placed in the gap and arranged in the circumferential direction. Each of the secondary permanent magnets has two opposite magnetic poles arranged in the circumferential direction. Each of the pole pieces is positioned between adjacent secondary permanent magnets. Magnetic pole arrangements of adjacent primary permanent magnets are opposite to each other. Magnetic pole arrangements of adjacent secondary permanent magnets are opposite to each other. Each of the secondary permanent magnets has a trapezoidal cross-sectional shape including an upper base and a lower base.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: November 2, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kenji Imanishi, Takuya Fujita, Hiroyuki Yamaguchi, Hiroshi Nogami, Yasutaka Noguchi, Mitsuo Miyahara
  • Publication number: 20210269069
    Abstract: An eddy-current rail brake device includes a row of magnets, a supporting member, a case, and a lifting device. The row of magnets includes a plurality of permanent magnets that are arranged in a traveling direction of a railroad car. To the supporting member, the row of magnets is mounted. The supporting member has magnetism. The case houses the row of magnets and the supporting member and includes a bottom portion that faces the row of magnets and is non-magnetic. The lifting device raises and lowers the supporting member inside the case while the row of magnets is kept facing the bottom portion. The eddy-current rail brake device can prevent or reduce adhesion of a foreign object and can be reduced in size in a right-left direction.
    Type: Application
    Filed: July 24, 2019
    Publication date: September 2, 2021
    Inventors: Shotaro KADOKAWA, Kenji IMANISHI, Hiroshi NOGAMI
  • Publication number: 20210036595
    Abstract: A decelerating apparatus includes a brake member, primary and secondary permanent magnets and pole pieces. The primary permanent magnets are arranged in a circumferential direction to face an inner or outer peripheral surface of the brake member with a gap in between. Each of the primary permanent magnets has two opposite magnetic poles arranged in a radial direction. The secondary permanent magnets and the pole pieces are placed in the gap and arranged in the circumferential direction. Each of the secondary permanent magnets has two opposite magnetic poles arranged in the circumferential direction. Each of the pole pieces is positioned between adjacent secondary permanent magnets. Magnetic pole arrangements of adjacent primary permanent magnets are opposite to each other. Magnetic pole arrangements of adjacent secondary permanent magnets are opposite to each other. Each of the secondary permanent magnets has a trapezoidal cross-sectional shape including an upper base and a lower base.
    Type: Application
    Filed: January 23, 2019
    Publication date: February 4, 2021
    Inventors: Kenji IMANISHI, Takuya FUJITA, Hiroyuki YAMAGUCHI, Hiroshi NOGAMI, Yasutaka NOGUCHI, Mitsuo MIYAHARA
  • Publication number: 20200400211
    Abstract: An eddy current damper includes a screw shaft movable in an axial direction, a plurality of first permanent magnets, a plurality of second permanent magnets, a cylindrical magnet holding member, a cylindrical conductive member having conductivity, a ball nut which meshes with the screw shaft, and a heat transfer layer which covers a surface of the conductive member opposed to the first permanent magnets and the second permanent magnets. The magnet holding member holds the first permanent magnet and the second permanent magnet. The conductive member is opposed to the first permanent magnets and the second permanent magnets with a gap therebetween. The ball nut is disposed inside the magnet holding member and the conductive member, and is fixed to the magnet holding member or the conductive member. The heat transfer layer has a thermal conductivity higher than that of the conductive member.
    Type: Application
    Filed: September 6, 2018
    Publication date: December 24, 2020
    Applicant: Nippon Steel Corporation
    Inventors: Yasutaka NOGUCHI, Kenji IMANISHI, Ryohsuke MASUI, Hiroshi NOGAMI
  • Patent number: 10756612
    Abstract: The disclosed is a deceleration device including a cylindrical brake member fixed to a rotary shaft, a plurality of permanent magnets arrayed in a circumferential direction of a circle around the rotary shaft, a cylindrical magnet holder holding the permanent magnets, and a switching mechanism that switches between a braking state and a non-braking state. The plurality of permanent magnets include primary magnets and secondary magnets that are arrayed alternatively in the circumferential direction. When viewed on a surface facing the brake member, north poles of the primary magnets are circumferentially adjacent to and in contact with north poles of the secondary magnets, and south poles of the primary magnets are circumferentially adjacent to and in contact with south poles of the secondary magnets. The magnetic holder is ferromagnetic.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: August 25, 2020
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kenji Imanishi, Hiroshi Nogami, Yasutaka Noguchi, Hiroyuki Yamaguchi, Takuya Fujita
  • Publication number: 20200263759
    Abstract: An eddy current damper includes a screw shaft, first permanent magnets, second permanent magnets, a cylindrical magnet holding member, a cylindrical conductive member, and a ball nut meshing with a screw shaft. The screw shaft is movable in the axial direction. The first permanent magnets are arrayed along the circumferential direction around the screw shaft. The second permanent magnet is arranged between the first permanent magnets, wherein the arrangement of magnet poles is inverted between the second permanent magnet and the first permanent magnet. The magnet holding member holds the first permanent magnet and the second permanent magnet. The conductive member is opposed to the first permanent magnets and the second permanent magnets with a gap therebetween. The ball nut is disposed inside the magnet holding member and the conductive member, and is fixed to the magnet holding member or the conductive member.
    Type: Application
    Filed: August 24, 2018
    Publication date: August 20, 2020
    Inventors: Kenji Imanishi, Hiroyuki Yamaguchi, Ryohsuke Masui, Shigeki Nakaminami, Hidenori Kida
  • Patent number: 10734881
    Abstract: An eddy current retarder includes a brake drum, a magnet retention ring, and a switch mechanism. The brake drum is fixed to a rotating shaft. The magnet retention ring is arranged inside the drum and retains magnets at regular intervals entirely in a circumferential direction such that the magnets face the inner peripheral surface of the drum. The switch mechanism includes switch plates that switch, during braking, to a state in which magnetic circuits develop between the magnets and the drum, and switch, during non-braking, to a state in which no magnetic circuits develop. Protrusions are provided on an end face of the drum at regular intervals entirely in the circumferential direction. Electricity generating coils are provided in a non-rotating part of a vehicle at regular intervals entirely in the circumferential direction such that the electricity generating coils face the regions of the end face of the drum.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: August 4, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kenji Imanishi, Hiroyuki Yamaguchi, Shotaro Kadokawa, Takuya Fujita, Hiroshi Nogami
  • Patent number: 10701768
    Abstract: The disclosed heat generating apparatus includes: a rotary shaft, a heat generator, a plurality of permanent magnets, a magnet holder, and a heat recovery system. The rotary shaft is rotatably supported by a non-rotative body. The heat generator is fixed to the body. The magnets are arrayed to face the heat generator with a gap such that magnetic pole arrangements of adjacent ones of the magnets are opposite to each other. The magnet holder holds the magnets and is fixed to the rotary shaft. The heat recovery system collects heat generated in the heat generator. A non-magnetic partition wall is provided in the gap between the heat generator and the magnets.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: June 30, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Yamaguchi, Atsushi Seto, Kenji Imanishi, Hiroshi Nogami
  • Patent number: 10667334
    Abstract: The disclosed heat generating apparatus includes: a rotary shaft, a heat generator, a plurality of permanent magnets, a magnet holder, and a heat recovery system. The rotary shaft is rotatably supported by a non-rotative body. The heat generator is fixed to the rotary shaft. The magnets are arrayed to face the heat generator with a gap such that magnetic pole arrangements of adjacent ones of the magnets are opposite to each other. The magnet holder holds the magnets and is fixed to the body. The heat recovery system collects heat generated in the heat generator.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: May 26, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Yamaguchi, Atsushi Seto, Kenji Imanishi, Hiroshi Nogami
  • Publication number: 20200086378
    Abstract: A production method includes a forging step, a flash-trimming step, and a pressing step. In the forging step, a finish-forged product with flash is formed by an upper forging, die and a lower forging die. In the forging step, an excess portion is formed on at least one crankarm which is connected to a first or third pin, in a portion near the first or third pin, on an outer periphery of a lateral part near the upper forging die, such that the excess portion protrudes from the outer periphery. In the pressing step, the excess portion is pressed by an upper die such that the excess portion bulges toward a journal. This method allows production of a forged crankshaft with a reduced weight and a sufficient rigidity in a simple facility.
    Type: Application
    Filed: October 17, 2017
    Publication date: March 19, 2020
    Inventors: Kenji TAMURA, Junichi OKUBO, Kenji IMANISHI, Kunihiro YABUNO, Sam Soo HWANG, Sho TAKAMOTO, Tadanao ISHII, Koichiro ISHIHARA
  • Publication number: 20200067397
    Abstract: A retarder includes a rotor, a plurality of fins, a plurality of permanent magnets, a switching mechanism, a first cover, a second cover, and a cover-switching mechanism. The fins are provided on an outer peripheral surface of the rotor and inclined with respect to a rotation direction of the rotor. The magnets are arranged inside the rotor. The first cover faces an end face of the rotor and includes a plurality of holes. The second cover protrudes from an outer circumferential edge of the first cover toward a rotor side. The cover-switching mechanism opens the holes in the braking state and closes the holes in the non-braking state. The first cover is disposed on a side on which a leading end portion of each fin is present. The retarder achieves suppressing windage and ensuring a heat dissipation performance.
    Type: Application
    Filed: October 3, 2017
    Publication date: February 27, 2020
    Inventors: Hiroshi NOGAMI, Kenji IMANISHI, Yasutaka NOGUCHI, Hiroyuki YAMAGUCHI, Shotaro KADOKAWA, Takuya FUJITA
  • Publication number: 20200039291
    Abstract: The production method disclosed is a method for producing a front axle beam. The production method includes a die forging step and a bending step. The die forging step is a step of forging a steel material with dies to produce a forged product including a rough web part, which is to be formed into a web part, and four plate-shaped rough flange parts protruding frontward and rearward from an upper side and a lower side of the rough web part, respectively. The bending step is a step of pressing at least one specified rough flange part, which is at least one of the four rough flange parts, with a first die to form a bent portion in the specified rough flange part such that the bent portion is bent inward in an up-down direction of the forged product.
    Type: Application
    Filed: April 3, 2018
    Publication date: February 6, 2020
    Inventors: Kenji TAMURA, Kenji IMANISHI, Sam Soo HWANG, Kunihiro YABUNO, Kunihiro YOSHIDA, Koichiro ISHIHARA
  • Publication number: 20200023427
    Abstract: The production method includes a first step, a second step and a third step. In the first step, a steel material is forged by dies, whereby a forged product including a rough web part and four plate-shaped rough flange parts is produced. In the second step, at least one specified rough flange part, which is at least one of the four rough flange parts, is pressed by a first die, whereby a first bent portion bending outward in an up-down direction is formed in the specified rough flange part. In the third step, the edge of the first bent portion is pressed by a second die inward in the up-down direction, whereby the edge is deformed and a second bent portion is formed. In the third step, the edge of the specified flange part is deformed while the edge is kept from deforming in a front-rear direction.
    Type: Application
    Filed: April 3, 2018
    Publication date: January 23, 2020
    Inventors: Kenji TAMURA, Kenji IMANISHI, Sam Soo HWANG, Kunihiro YABUNO, Kunihiro YOSHIDA, Koichiro ISHIHARA