Patents by Inventor Hiromitsu Asai
Hiromitsu Asai 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: 10554087Abstract: A rotating electric machine includes a pair of electric conductors for forming a coil and a weld. Each of the electric conductors has an end portion with an end surface. The weld is formed between the end portions of the electric conductors at the end surfaces of the end portions. Moreover, the end portions of the electric conductors are arranged so that parts of the end portions of the electric conductors adjoin each other. At least one of the end portions of the electric conductors has at least one slit formed therein to divide the end surface of the end portion into a plurality of sections. The weld is formed to cover, at least, the adjoining parts of the end portions of the electric conductors and the at least one slit.Type: GrantFiled: March 2, 2017Date of Patent: February 4, 2020Assignee: DENSO CORPORATIONInventors: Atsuo Ishizuka, Hiromitsu Asai, Mitsuyuki Hayashi, Yoki Tsujimori
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Patent number: 10075039Abstract: A rotating electric machine includes a weld formed by welding end portions of a pair of electric conductors for forming a coil and a weld-insulating member that covers, at least, a surface of the weld. The weld has an uneven portion formed on at least part of the surface thereof. The uneven portion is constituted of a plurality of annular recesses and a plurality of annular protrusions. The annular recesses are formed alternately and continuously with the annular protrusions.Type: GrantFiled: July 26, 2016Date of Patent: September 11, 2018Assignee: DENSO CORPORATIONInventors: Atsuo Ishizuka, Hiroshi Kaneiwa, Keiji Kondou, Hiromitsu Asai
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Publication number: 20170257002Abstract: A rotating electric machine includes a pair of electric conductors for forming a coil and a weld. Each of the electric conductors has an end portion with an end surface. The weld is formed between the end portions of the electric conductors at the end surfaces of the end portions. Moreover, the end portions of the electric conductors are arranged so that parts of the end portions of the electric conductors adjoin each other. At least one of the end portions of the electric conductors has at least one slit formed therein to divide the end surface of the end portion into a plurality of sections. The weld is formed to cover, at least, the adjoining parts of the end portions of the electric conductors and the at least one slit.Type: ApplicationFiled: March 2, 2017Publication date: September 7, 2017Applicant: DENSO CORPORATIONInventors: Atsuo ISHIZUKA, Hiromitsu ASAI, Mitsuyuki HAYASHI, Yoki TSUJIMORI
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Publication number: 20170033636Abstract: A rotating electric machine includes a weld formed by welding end portions of a pair of electric conductors for forming a coil and a weld-insulating member that covers, at least, a surface of the weld. The weld has an uneven portion formed on at least part of the surface thereof. The uneven portion is constituted of a plurality of annular recesses and a plurality of annular protrusions. The annular recesses are formed alternately and continuously with the annular protrusions.Type: ApplicationFiled: July 26, 2016Publication date: February 2, 2017Applicant: DENSO CORPORATIONInventors: Atsuo ISHIZUKA, Hiroshi KANEIWA, Keiji KONDOU, Hiromitsu ASAI
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Patent number: 8847075Abstract: An insulated wire having: a conductor, a baked enamel layer containing at least a polyamide-imide provided on the outer periphery of the conductor directly or through an insulated layer, and at least one extrusion-coated resin layer provided on the outer side of the baked enamel layer, wherein the baked enamel layer has at least one functional group selected from the group consisting of a carboxyl group, an ester group, an ether group and a hydroxyl group on the outer surface thereof, and adheres to the extrusion-coated resin layer.Type: GrantFiled: July 24, 2012Date of Patent: September 30, 2014Assignees: Furukawa Electric Co., Ltd., Furukawa Magnet Wire Co., Ltd., Denso CorporationInventors: Keisuke Ikeda, Makoto Oya, Yoshihisa Kano, Takashi Aoki, Tatsunori Makishima, Akio Sugiura, Hiromitsu Asai, Shinichi Matsubara
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Patent number: 8586869Abstract: An inverter surge-resistant insulated wire, having an enamel baked layer, an adhesive layer, and an extrusion-coated resin layer, around the outer periphery of a conductor, wherein the sum of the thickness of the enamel baked layer, the extrusion-coated resin layer, and the adhesive layer is 60 ?m or more, wherein the thickness of the enamel baked layer is 50 ?m or less, and wherein the extrusion-coated resin layer is formed from a polyphenylene sulfide resin composition, which contains a polyphenylene sulfide polymer having a melt viscosity at 300° C. of 100 Pa·s or more, 2 to 8 mass % of a thermoplastic elastomer, and an antioxidant, and which has a tensile modulus of elasticity at 25° C. of 2,500 MPa or more, and a tensile modulus of elasticity at 250° C. of 10 MPa or more.Type: GrantFiled: February 25, 2011Date of Patent: November 19, 2013Assignees: Furukawa Electric Co., Ltd., Denso Corporation, DIC CorporationInventors: Tsuneo Aoi, Dai Fujiwara, Daisuke Muto, Hiromitsu Asai, Shinji Kouda, Fumiaki Abe
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Publication number: 20130037304Abstract: An insulated wire having: a conductor, a baked enamel layer containing at least a polyamide-imide provided on the outer periphery of the conductor directly or through an insulated layer, and at least one extrusion-coated resin layer provided on the outer side of the baked enamel layer, wherein the baked enamel layer has at least one functional group selected from the group consisting of a carboxyl group, an ester group, an ether group and a hydroxyl group on the outer surface thereof, and adheres to the extrusion-coated resin layer.Type: ApplicationFiled: July 24, 2012Publication date: February 14, 2013Inventors: Keisuke IKEDA, Makoto Oya, Yoshihisa Kano, Takashi Aoki, Tatsunori Makishima, Akio Sugiura, Hiromitsu Asai, Shinichi Matsubara
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Publication number: 20110226508Abstract: An inverter surge-resistant insulated wire, having an enamel baked layer, an adhesive layer, and an extrusion-coated resin layer, around the outer periphery of a conductor, wherein the sum of the thickness of the enamel baked layer, the extrusion-coated resin layer, and the adhesive layer is 60 ?m or more, wherein the thickness of the enamel baked layer is 50 ?m or less, and wherein the extrusion-coated resin layer is formed from a polyphenylene sulfide resin composition, which contains a polyphenylene sulfide polymer having a melt viscosity at 300° C. of 100 Pa·s or more, 2 to 8 mass % of a thermoplastic elastomer, and an antioxidant, and which has a tensile modulus of elasticity at 25° C. of 2,500 MPa or more, and a tensile modulus of elasticity at 250° C. of 10 MPa or more.Type: ApplicationFiled: February 25, 2011Publication date: September 22, 2011Applicants: FURUKAWA ELECTRIC CO., LTD., DENSO CORPORATION, DIC CORPORATIONInventors: Tsuneo AOI, Dai FUJIWARA, Daisuke MUTO, Hiromitsu ASAI, Shinji KOUDA, Fumiaki ABE
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Publication number: 20070201782Abstract: A distal edge of an outside seal lip 22a is brought into sliding contact with an entire circumference of the surface of a mating member. A contact angle ? that is formed at a sliding contact portion between the distal edge of the outside seal lip 22a and the mating member on the side of an interior space 33 is made to fall within a range of 13 to 45 degrees by providing a bent portion 34 at a portion on the outside seal lip 22a which lies closer to a distal end thereof.Type: ApplicationFiled: February 12, 2007Publication date: August 30, 2007Inventors: Takayuki Miyagawa, Hiromitsu Asai
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Patent number: 6715922Abstract: A rolling bearing with the sealing device which has a fitting groove and sealing device with a mounting portion. The fitting groove formed on the inner peripheral surface of an outer ring. An outside surface of the fitting groove tilts at 5 to 30 degrees with respect to an radial direction of the bearing. An inside surface of the fitting groove tilts at a tilt angle smaller than that of the outside surface. A total of these tilt angles is 35 degrees or more. The mounting portion has a base portion contacting the inside surface and a portion projecting toward the outside surface of the fitting groove from the base portion, and the mounting portion is thinnest at a front end portion of the projecting portion.Type: GrantFiled: November 16, 2001Date of Patent: April 6, 2004Assignee: NSK Ltd.Inventors: Hiromitsu Asai, Toshimi Takajo, Takahiko Uchiyama, Takashi Ogawa, Yoshinori Tanaka
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Publication number: 20020097934Abstract: A rolling bearing with the sealing device which has a fitting groove and sealing device with a mounting portion. The fitting groove formed on the inner peripheral surface of an outer ring. An outside surface of the fitting groove tilts at 5 to 30 degrees with respect to an radial direction of the bearing. An inside surface of the fitting groove tilts at a tilt angle smaller than that of the outside surface. A total of these tilt angles is 35 degrees or more. The mounting portion has a base portion contacting the inside surface and a portion projecting toward the outside surface of the fitting groove from the base portion, and the mounting portion is thinnest at a front end portion of the projecting portion.Type: ApplicationFiled: November 16, 2001Publication date: July 25, 2002Applicant: NSK LTD.Inventors: Hiromitsu Asai, Toshimi Takajo, Takahiko Uchiyama, Takashi Ogawa, Yoshinori Tanaka
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Patent number: 6412984Abstract: The present invention provides a dynamic pressure bearing apparatus comprising a cylindrical bearing member, and a rotary shaft disposed within a cylindrical bore of the cylindrical bearing member, and wherein the bearing member has a thrust bearing surface provided at a bottom of the cylindrical bore, a radial bearing surface provided on an inner peripheral surface of the cylindrical bearing member, and a lubricating oil reservoir provided at an opening portion of the cylindrical bore and having a diameter greater than that of the radial bearing surface, and the rotary shaft has a radial receiving surface opposed to the radial bearing surface with the interposition of a radial bearing gap, and a thrust receiving surface opposed to the thrust bearing surface, and further wherein the bearing member is closed at the bottom thereof, a dynamic pressure generating groove is formed in at least one of the radial bearing surface and the radial receiving surface, and the dynamic pressure generating groove generates aType: GrantFiled: December 12, 2000Date of Patent: July 2, 2002Assignee: NSK Ltd.Inventors: Hiromitsu Asai, Yoichiro Sugimori
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Publication number: 20010001269Abstract: The present invention provides a dynamic pressure bearing apparatus comprising a cylindrical bearing member, and a rotary shaft disposed within a cylindrical bore of the cylindrical bearing member, and wherein the bearing member has a thrust bearing surface provided at a bottom of the cylindrical bore, a radial bearing surface provided on an inner peripheral surface of the cylindrical bearing member, and a lubricating oil reservoir provided at an opening portion of the cylindrical bore and having a diameter greater than that of the radial bearing surface, and the rotary shaft has a radial receiving surface opposed to the radial bearing surface with the interposition of a radial bearing gap, and a thrust receiving surface opposed to the thrust bearing surface, and further wherein the bearing member is closed at the bottom thereof, a dynamic pressure generating groove is formed in at least one of the radial bearing surface and the radial receiving surface, and the dynamic pressure generating groove generates aType: ApplicationFiled: December 12, 2000Publication date: May 17, 2001Inventor: Hiromitsu Asai
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Patent number: 6074098Abstract: A novel hydro-dynamic fluid bearing device is herein disclosed which comprises a cylindrical shaft, a substantially cylindrical bearing member for axially supporting the shaft rotatably in a cylindrical hole having a bottom surface, a supporting member fixed on one side of the shaft and the bearing member, and a rotation member fixed on the other side of the shaft and the bearing member and rotatably supported on the supporting member, grooves for generating hydro-dynamic fluid being formed on at least one of the outer peripheral surface of the shaft and the inner peripheral surface of the cylindrical hole of the bearing member, wherein the bearing member is made of a resin material, and the outer peripheral surface of the substantially cylindrical portion is fixed to an annular reinforcing member having a higher rigidity than the bearing member.Type: GrantFiled: September 1, 1999Date of Patent: June 13, 2000Assignee: NSK Ltd.Inventors: Hiromitsu Asai, Katsuhiko Tanaka, Ikunori Sakatani, Hiromitsu Muraki
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Patent number: 6033118Abstract: A novel hydro-dynamic fluid bearing device is herein disclosed which comprises a cylindrical shaft, a substantially cylindrical bearing member for axially supporting the shaft rotatably in a cylindrical hole having a bottom surface, a supporting member fixed on one side of the shaft and the bearing member, and a rotation member fixed on the other side of the shaft and the bearing member and rotatably supported on the supporting member, grooves for generating hydro-dynamic fluid being formed on at least one of the outer peripheral surface of the shaft and the inner peripheral surface of the cylindrical hole of the bearing member, wherein the bearing member is made of a resin material, and the outer peripheral surface of the substantially cylindrical portion is fixed to an annular reinforcing member having a higher rigidity than the bearing member.Type: GrantFiled: March 3, 1998Date of Patent: March 7, 2000Assignee: NSK Ltd.Inventors: Hiromitsu Asai, Katsuhiko Tanaka, Ikunori Sakatani, Hiromitsu Muraki
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Patent number: 5965263Abstract: There is disclosed an insulated wire, having, on a conductor, an insulating coating including at least three layers, made up of an underlayer formed by applying and baking a polyamine-imide-series resin coating material, containing 0.05 to 1.0 parts by weight of a trialkylamine, and/or 5 to 20 parts by weight of an alkoxylated melamine resin, per 100 parts by weight of a polyamide-imide-series resin, an intermediate layer formed by applying and baking a polyimide-series resin coating material, and an overlayer formed by applying and baking a self-lubricating-type polyamide-imide-series resin coating material. According to the insulated wire, an insulating coating can be prevented from being damaged at the time of the working of a coil under severe conditions, even when the insulating coating is thin.Type: GrantFiled: December 22, 1997Date of Patent: October 12, 1999Assignees: The Furukawa Electric Co., Ltd., Denso CorporationInventors: Yoshinori Tatematsu, Atsushi Higashiura, Naruhiko Inayoshi, Hiromitsu Asai
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Patent number: 5558448Abstract: A rolling bearing comprising an outer race having one track, an inner race having the other track, a plurality of rolling elements arranged between the both tracks, and a cage for retaining the plurality of rolling elements in such a way that the rolling elements can roll freely, wherein the cage is a lubricating oil-containing polymer member obtained by molding a synthetic resin containing 10 to 80% by weight of a lubricating oil. The cage retains a sufficient amount of a lubricating oil at a high rate of retention so that a lubricating action can be maintained in a stable manner for a prolonged period of time, and it is produced at low cost.Type: GrantFiled: July 7, 1995Date of Patent: September 24, 1996Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Hiromitsu Asai, Magozo Hamamoto
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Patent number: 5501526Abstract: A sliding bearing having a sliding surface adapted to move with reference to a sliding guide surface with the sliding surface of the bearing faced to the sliding guide surface, the bearing comprising a sliding bearing member made of synthetic resin to substantially define the sliding surface of the bearing and a lubricating composition member made of thermoplastic or thermosetting resin that contains lubricating oil such as mineral oil therein and assembled with the sliding bearing member to partly define the sliding surface of the bearing.Type: GrantFiled: June 15, 1994Date of Patent: March 26, 1996Assignee: NSK Ltd.Inventors: Hiromitsu Asai, Takahiko Uchiyama
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Patent number: 5129739Abstract: A bearing with dynamic pressure grooves includes an outer cylinder made of a metal and a resin sheet bonded to the inner peripheral surface of the outer cylinder. The resin sheet is made of a thermoplastic resin, for example, a polytetra fluoroethylene, as a main component mixed with a wear-resistant improving material, for example, graphite or the like. The resin sheet is formed with a pattern of dynamic pressure generating grooves formed in an inner surface by plastic work. The pattern of grooves is varied depending on the types of relative movement between the outer cylinder and a shaft body, i.e., whether an axial linear movement, a rotational movement, or a spiral movement.Type: GrantFiled: December 13, 1991Date of Patent: July 14, 1992Assignee: Nippon Seiko Kabushiki KaishaInventors: Hiromitsu Asai, Hiromi Sugi, Takashi Nagato
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Patent number: 5009520Abstract: A dynamic pressure type bearing is applicable to a precision mechanical equipment. The bearing includes a hollow inner cylinder to fit a rotatable shaft. The inner cylinder is made of a thermosetting resin containing a 5 wt % to 75 wt % heat treated phenol resin powder and a 5 wt % to 75 wt % silicon dioxide, the total content of the phenol resin powder and the silicon dioxide being 50 wt % to 80 wt %. A spindle unit includes the bearing and a spindle made of an alloy containing aluminum as a main element. The bearing has a superior wear resistance, frictional characteristic and molding accuracy of the inner cylinder. The superior frictional characteristic of the inner cylinder allows a relatively soft spindle to be used in a spindle unit.Type: GrantFiled: April 18, 1990Date of Patent: April 23, 1991Assignee: Nippon Seiko Kabushiki KaishaInventors: Toshimi Takajo, Hiromitsu Asai, Kiyoshi Haginuma