Patents by Inventor Youichi Murakami
Youichi Murakami 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: 11884313Abstract: A railroad equipment state determination apparatus includes: a storage that stores a plurality of operation data associated with a prescribed operation performed by railroad equipment that is driven by a motor from a stopped state to perform the prescribed operation and then comes into the stopped state again; an evaluation criteria setting section that sets evaluation criteria based on the plurality of operation data stored in the storage; and a determination section that determines whether new operation data resulting from the prescribed operation newly performed by the railroad equipment is abnormal based on the evaluation criteria.Type: GrantFiled: August 18, 2020Date of Patent: January 30, 2024Assignee: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Toshio Kitajima, Youichi Murakami
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Publication number: 20210018338Abstract: Provided is a technique for detecting a vehicle type and a traveling direction of a vehicle by an electromagnetic induction sensor. A sensor unit (10), which is an electromagnetic induction sensor, includes a transmission coil (TX1), a first reception coil (RX1), and a second reception coil (RX2). A magnetic field of a vehicle (90) made of steel attracts a magnetic field emitted from the transmission coil (TX1) (S1). As the vehicle (90) approaches, a state 1 indicated by the broken line changes to a state 2 indicated by the dash-dot line (S2). A reduction in induced voltage and a phase change occur with respect to the induced voltage when the first reception coil (RX1) is in the magnetic field of state 1 (when the vehicle is not detected) (S3). The differential output signals of the second reception coil RX2 and the first reception coil RX1 change according to the advancement of the vehicle and according to the unevenness of the vehicle bottom portion 92 and the metal species (S4).Type: ApplicationFiled: March 27, 2018Publication date: January 21, 2021Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Makoto KANEKO, Youichi MURAKAMI, Katsunori NAKAJIMA, Yuichiro NAKAYAMA
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Publication number: 20200377132Abstract: A railroad equipment state determination apparatus includes: a storage that stores a plurality of operation data associated with a prescribed operation performed by railroad equipment that is driven by a motor from a stopped state to perform the prescribed operation and then comes into the stopped state again; an evaluation criteria setting section that sets evaluation criteria based on the plurality of operation data stored in the storage; and a determination section that determines whether new operation data resulting from the prescribed operation newly performed by the railroad equipment is abnormal based on the evaluation criteria.Type: ApplicationFiled: August 18, 2020Publication date: December 3, 2020Inventors: Toshio KITAJIMA, Youichi MURAKAMI
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Patent number: 9528560Abstract: A recess, which has a bottom, is formed in at least one of a contact surface of a rotor and a contact surface of an armature. A solid material, which is made of thermoset resin that contains powder of metal oxide or metal dispersed in the thermoset resin, is formed in an inside of the recess.Type: GrantFiled: October 20, 2014Date of Patent: December 27, 2016Assignees: DENSO CORPORATION, MEIJO UNIVERSITYInventors: Yousuke Yamagami, Yasuo Tabuchi, Motohiko Ueda, Shouzou Tatematsu, Youichi Murakami, Shigeyoshi Sakuraba, Hatsuhiko Usami
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Patent number: 9337599Abstract: A carbon brush for a fuel pump includes a brush body and a lead wire connected to the brush body, and the brush body has carbon and polyether ether ketone as main components. Abnormal wear does not occur even if a fuel pump motor is operated at a high voltage.Type: GrantFiled: December 15, 2011Date of Patent: May 10, 2016Assignees: Denso Corporation, TRIS Inc.Inventors: Makoto Nishio, Shinya Nakagawa, Kiyotoshi Oi, Youichi Murakami, Takashi Fukutsuka, Ryouichi Honbo
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Publication number: 20150292573Abstract: A recess, which has a bottom, is formed in at least one of a contact surface of a rotor and a contact surface of an armature. A solid material, which is made of thermoset resin that contains powder of metal oxide or metal dispersed in the thermoset resin, is formed in an inside of the recess.Type: ApplicationFiled: October 20, 2014Publication date: October 15, 2015Inventors: Yousuke YAMAGAMI, Yasuo TABUCHI, Motohiko UEDA, Shouzou TATEMATSU, Youichi MURAKAMI, Shigeyoshi SAKURABA, Hatsuhiko USAMI
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Publication number: 20140291105Abstract: An electromagnetic clutch with improved transmission torque by means of a low-cost method includes an electromagnetic coil, a rotor that is rotary driven by means of an external drive source, an armature attracted to the rotor by means of a magnetic force of the electromagnetic coil, and a hub structure. The electromagnetic clutch is characterized in that a recessed and projected surface having a surface roughness of 10 ?m or more and a hardness of 4 GPa or less is formed on the friction surface of the rotor and/or the friction surface of the armature.Type: ApplicationFiled: November 2, 2012Publication date: October 2, 2014Inventors: Shigeyoshi Sakuraba, Yasuo Tabuchi, Youichi Murakami
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Publication number: 20130300251Abstract: A carbon brush for a fuel pump includes a brush body and a lead wire connected to the brush body, and the brush body has carbon and polyether ether ketone as main components. Abnormal wear does not occur even if a fuel pump motor is operated at a high voltage.Type: ApplicationFiled: December 15, 2011Publication date: November 14, 2013Applicants: DENSO CORPORATION, TRIS INC.Inventors: Makoto Nishio, Shinya Nakagawa, Kiyotoshi Oi, Youichi Murakami, Takashi Fukutsuka, Ryouichi Honbo
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Patent number: 7883588Abstract: In a Cu—Bi based sintered alloy, to which hard particles, such as Fe3P, are added, the main constituent components of the microstructure are a Cu matrix, Bi phase and the hard particles. In the sintering method of the present invention, the flow of the Bi phase is suppressed to as low level as possible. The novel structure is that the contact between the Bi phase and hard particles is kept to a low ratio. A lead-free bearing used for a fuel injection pump according to the present invention contains from 1 to 30 mass % of Bi and from 0.1 to 10 mass % of hard particles having from 10 to 50 ?m of the average particle diameter, the balance being Cu and unavoidable impurities. The properties of the main component phases are utilized at a high level such that the sliding properties are equivalent to those of a Pb containing Cu-based sintered alloy.Type: GrantFiled: June 9, 2005Date of Patent: February 8, 2011Assignees: Taiho Kogyo Co., Ltd., Denso CorporationInventors: Hiromi Yokota, Daisuke Yoshitome, Hiroaki Hayakawa, Naruhiko Inayoshi, Youichi Murakami, Masashi Suzuki, Takahiro Nozu
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Patent number: 7586230Abstract: In a commutator of a rotary electric machine, each of commutator segments has a low-resistive layer made of a low-resistive material and a high-resistive layer made of a high-resistive material having a specific resistance higher than that of the low-resistive material. The low-resistive material contains a carbonic material and a binder. The high-resistive material contains a carbonic material, a binder and an inorganic substance such as boron nitride. A mixing ratio of the inorganic material to the high-resistive material is more than 20 wt %. Alternatively, a brush, which makes contact with the commutator segments, can have the high-resistive layer and the low-resistive layer.Type: GrantFiled: November 30, 2005Date of Patent: September 8, 2009Assignees: Denso Corporation, Tris, Inc.Inventors: Hirotake Hamamatsu, Youichi Murakami, Ryoichi Honbo, Kenzo Kiyose, Mitsuo Ikeda, Yoichi Sakaura, Shinya Nakagawa, Makoto Nishio
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Patent number: 7294166Abstract: A brush body 4 of a metal-graphite brush 2 is composed of a commutator side portion 6 which contains graphite, copper and a metal sulfide solid lubricant, and a lead side portion 8 which contains graphite and copper but does not contain any metal sulfide solid lubricant. A lead wire 10 is attached to the lead side portion 8 containing no metal sulfide solid lubricant.Type: GrantFiled: October 24, 2002Date of Patent: November 13, 2007Assignees: Tris Inc., Denso CorporationInventors: Takayoshi Otani, Mitsuo Ikeda, Yoichi Sakaura, Naoki Morita, Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi
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Patent number: 7067951Abstract: A copper-zinc alloy powder of which zinc content is from 10 to 50 wt % and of which mean particle diameter is from 15 ?m or under is added to a Pb-less brush body comprising graphite, copper and a metal sulfide solid lubricant of a copper-graphite brush.Type: GrantFiled: January 27, 2003Date of Patent: June 27, 2006Assignees: Tris Inc., Denso CorporationInventors: Takayoshi Otani, Masakiyo Shimada, Hirotada Kanagawa, Yukinobu Isoda, Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi, Ryoichi Honbo
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Publication number: 20060131983Abstract: In a commutator of a rotary electric machine, each of commutator segments has a low-resistive layer made of a low-resistive material and a high-resistive layer made of a high-resistive material having a specific resistance higher than that of the low-resistive material. The low-resistive material contains a carbonic material and a binder. The high-resistive material contains a carbonic material, a binder and an inorganic substance such as boron nitride. A mixing ratio of the inorganic material to the high-resistive material is more than 20 wt %. Alternatively, a brush, which makes contact with the commutator segments, can have the high-resistive layer and the low-resistive layer.Type: ApplicationFiled: November 30, 2005Publication date: June 22, 2006Applicants: Denso Corporation, TRIS Inc.Inventors: Hirotake Hamamatsu, Youichi Murakami, Ryoichi Honbo, Kenzo Kiyose, Mitsuo Ikeda, Yoichi Sakaura, Shinya Nakagawa, Makoto Nishio
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Publication number: 20060087197Abstract: A brush body 4 of a metal-graphite brush 2 is composed of a commutator side portion 6 which contains graphite, copper and a metal sulfide solid lubricant, and a lead side portion 8 which contains graphite and copper but does not contain any metal sulfide solid lubricant. A lead wire 10 is attached to the lead side portion 8 containing no metal sulfide solid lubricant.Type: ApplicationFiled: October 24, 2002Publication date: April 27, 2006Applicants: TRIS Inc., DENSO CORPORATIONInventors: Takayoshi Otani, Mitsuo Ikeda, Yoichi Sakaura, Naoki Morita, Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi
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Publication number: 20060000527Abstract: In a Cu—Bi based sintered alloy, to which hard particles, such as Fe3P, are added, the main constituent components of the microstructure are a Cu matrix, Bi phase and the hard particles. In the sintering method of the present invention, the flow of the Bi phase is suppressed to as low level as possible. The novel structure is that the contact between the Bi phase and hard particles is kept to a low ratio. A lead-free bearing used for a fuel injection pump according to the present invention contains from 1 to 30 mass % of Bi and from 0.1 to 10 mass % of hard particles having from 10 to 50 ?m of the average particle diameter, the balance being Cu and unavoidable impurities. The properties of the main component phases are utilized at a high level such that the sliding properties are equivalent to those of a Pb containing Cu-based sintered alloy.Type: ApplicationFiled: June 9, 2005Publication date: January 5, 2006Applicants: TAIHO KOGYO Co., Ltd., Kabushiki Kaisya DensoInventors: Hiromi Yokota, Daisuke Yoshitome, Hiroaki Hayakawa, Naruhiko Inayoshi, Youichi Murakami, Masashi Suzuki, Takahiro Nozu
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Patent number: 6949863Abstract: A metal-graphite brush comprises a brush body which is made by mixing and molding metal powder and graphite powder. 2 mg to 30 mg as amounts of phosphate ion of at least one of phosphoric acid and a phosphate compound is added to 1 g of the brush body of the metal-graphite brush.Type: GrantFiled: December 24, 2002Date of Patent: September 27, 2005Assignees: Tris Inc., Denso CorporationInventors: Takayoshi Otani, Osamu Takada, Toshio Ishikawa, Mitsuo Ikeda, Yoichi Sakaura, Naoki Morita, Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi
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Patent number: 6815862Abstract: In a multilayer brush composed chiefly of copper and graphite and incorporated therein with a solid lubricant, which consists essentially of two types of brushes, a high-copper-content part brush containing the copper in a large quantity and a low-copper-content part brush containing the copper in a small quantity, at least the high-copper-content part brush contains zinc in an amount of from 0.1% by weight to 5% by weight, and the zinc and the copper form an alloy. This can provide a multilayer brush having a superior durability, which can prevent the performance of motors from lowering, without use of the harmful substance such as lead, and may less undergo any wear due to mechanical and electrical sparkling of the brush.Type: GrantFiled: February 4, 2004Date of Patent: November 9, 2004Assignee: Denso CorporationInventors: Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi, Teruo Kobayashi, Hiroaki Kawamura, Nobuyuki Yamashita
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Publication number: 20040174088Abstract: In a multilayer brush composed chiefly of copper and graphite and incorporated therein with a solid lubricant, which consists essentially of two types of brushes, a high-copper-content part brush containing the copper in a large quantity and a low-copper-content part brush containing the copper in a small quantity, at least the high-copper-content part brush contains zinc in an amount of from 0.1% by weight to 5% by weight, and the zinc and the copper form an alloy. This can provide a multilayer brush having a superior durability, which can prevent the performance of motors from lowering, without use of the harmful substance such as lead, and may less undergo any wear due to mechanical and electrical sparkling of the brush.Type: ApplicationFiled: February 4, 2004Publication date: September 9, 2004Inventors: Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi, Teruo Kobayashi, Hiroaki Kawamura, Nobuyuki Yamashita
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Patent number: 6758881Abstract: Ag particles produced by chemical reduction and having a mean particle size of 5 &mgr;m are added by 0.05-3 wt % and Zn are added by 2-10 wt % to a Pb-less brush body containing graphite, Cu and a metal sulfide solid lubricant of a metal-graphite brush.Type: GrantFiled: March 25, 2003Date of Patent: July 6, 2004Assignees: Tris Inc., Denso CorporationInventors: Takayoshi Otani, Osamu Takada, Mitsuo Ikeda, Yoichi Sakaura, Naoki Morita, Takahiro Sakamoto, Kyoji Inukai, Youichi Murakami, Yasuyuki Wakahara, Masami Niimi, Ryochi Honbo
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Patent number: 6700292Abstract: A metal-graphite brush has a copper-graphite brush body to which a metal sulfide solid lubricant is added and a lead embedded. Indium is at least added to an interface between the brush body and the lead in a concentration of 0.4-8 wt %.Type: GrantFiled: October 24, 2002Date of Patent: March 2, 2004Assignees: Tris Inc., Denso CorporationInventors: Takayoshi Otani, Mitsuo Ikeda, Yoichi Sakaura, Takahiro Sakamoto, Youichi Murakami, Kyoji Inukai, Yasuyuki Wakahara, Masami Niimi