Patents by Inventor Kouji Kitahata
Kouji Kitahata 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: 9024496Abstract: At least part of each bridge portion is heated and molten to form a keyhole, and a nonmagnetic element is disposed around the keyhole. Thus, even when the width of the bridge portion in the radial direction is increased, the bridge portion is demagnetized. Therefore, leakage flux in the bridge portion is reduced, and the output power of a motor is increased. Moreover, by increasing the width of the bridge portion in the radial direction, the strength of the bridge portion is increased, and breakage of the bridge portion due to a centrifugal force at high-speed rotation of a rotor is prevented.Type: GrantFiled: November 27, 2012Date of Patent: May 5, 2015Assignee: JTEKT CorporationInventors: Takaya Nagahama, Masami Naka, Kouji Kitahata, Yoshiyuki Shibata, Shigeki Nagase, Takashi Kageyama
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Patent number: 8708089Abstract: A vehicle steering apparatus includes an actuator that generates a steering force, and a first speed reduction mechanism connected to the actuator. To the first speed reduction mechanism, a second speed reduction mechanism is connected. To the second speed reduction mechanism, a steering mechanism is connected. A sub-assembly including the actuator and the first speed reduction mechanism is configured.Type: GrantFiled: July 15, 2009Date of Patent: April 29, 2014Assignee: Jtekt CorporationInventors: Kouji Kitahata, Shiro Nakano, Masaya Segawa, Yoshiharu Nogami
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Patent number: 8664949Abstract: A resolver includes: a resolver rotor attached to a rotational shaft; an annular resolver stator that is provided on a radially outer side of the resolver rotor and that has a plurality of teeth each opposed, across a clearance, to an outer peripheral face of the resolver rotor and circumferentially arranged at given intervals; and a case member having a cylindrical fit portion to which an outer peripheral face of the resolver stator is fitted. At least three protrusions, each protruding radially outward, are formed at given circumferential intervals on the outer peripheral face of the resolver stator, so that the outer peripheral face of the resolver stator is press-fitted to an inner peripheral face of the fit portion at positions at which the protrusions are formed.Type: GrantFiled: January 24, 2012Date of Patent: March 4, 2014Assignee: Jtekt CorporationInventors: Tomoyuki Takei, Kouji Kitahata, Toshiki Kumeno, Takashi Matsumoto
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Publication number: 20130021022Abstract: A resolver stator includes an annular first cover portion, an annular second cover portion, and a plurality of pillars. The first and second cover portions cover coils from both axial sides. The pillars couple the first and second cover portions, and are arranged between the adjacent teeth. Each pillar has circumferential side faces each of which has a radially inner end portion that is arranged with a labyrinth clearance left between the radially inner end portion and a radially inner end portion of the tooth next to the side face, and each of which is a concave curved surface so as to be further apart from the tooth from the radially inner end portion toward a radially outer end portion of the side face.Type: ApplicationFiled: June 29, 2012Publication date: January 24, 2013Applicant: JTEKT CORPORATIONInventors: Tomoyuki TAKEI, Kouji KITAHATA, Toshiki KUMENO, Yoshimichi HIGASHIYAMA
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Publication number: 20130015748Abstract: A motor includes: a rotary shaft; a rotor that is provided on the rotary shaft so as to be rotatable together with the rotary shaft; a stator that is provided radially outward of the rotor; a housing that supports the stator; a resolver that has a resolver rotor rotatable together with the rotary shaft and a resolver stator radially facing the resolver rotor; and a resolver unit that is an assembly component including the resolver stator. The resolver unit includes a bearing that rotatably supports the rotary shaft and a case member that has a first fitting portion to which the resolver stator is fitted and a second fitting portion to which the bearing fitted and that is detachably connected to the housing. At least part of the resolver unit is arranged on a radially inner side of the rotor.Type: ApplicationFiled: June 14, 2012Publication date: January 17, 2013Applicant: JTEKT CORPORATIONInventors: Tomoyuki TAKEI, Ken MATSUBARA, Kouji KITAHATA
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Publication number: 20120217828Abstract: A resolver-bearing unit according to the invention includes a resolver sensor that detects the rotational position of a shaft. The resolver sensor includes an annular stator disposed around a rotor; and a case that is fitted to an outer periphery of the stator, and covers the rotor and the stator. The stator includes an annular stator core with a plurality of teeth formed on an inner periphery thereof; first and second insulators; and coils respectively wound around the teeth via the first and second insulators. The first insulator is provided with a connector. The connector connects a harness for outputting detected rotational position of the shaft to lead wires that extend from the coils, with the harness extending in an axial direction of the shaft.Type: ApplicationFiled: February 9, 2012Publication date: August 30, 2012Applicant: JTEKT CORPORATIONInventors: Tomoyuki TAKEI, Kouji KITAHATA, Toshiki KUMENO
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Publication number: 20120206131Abstract: A resolver includes: a resolver rotor attached to a rotational shaft; an annular resolver stator that is provided on a radially outer side of the resolver rotor and that has a plurality of teeth each opposed, across a clearance, to an outer peripheral face of the resolver rotor and circumferentially arranged at given intervals; and a case member having a cylindrical fit portion to which an outer peripheral face of the resolver stator is fitted. At least three protrusions, each protruding radially outward, are formed at given circumferential intervals on the outer peripheral face of the resolver stator, so that the outer peripheral face of the resolver stator is press-fitted to an inner peripheral face of the fit portion at positions at which the protrusions are formed.Type: ApplicationFiled: January 24, 2012Publication date: August 16, 2012Applicant: JTEKT CORPORATIONInventors: Tomoyuki Takei, Kouji Kitahata, Toshiki Kumeno, Takashi Matsumoto
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Patent number: 8063002Abstract: A solid lubricating composition having resin material is disposed between an outer ring and an inner ring of a ball bearing. As the resin material contained in the solid lubricating composition, resin material having a property of being solidified when the resin material in a fluid state is irradiated with an ultraviolet beam is used.Type: GrantFiled: May 23, 2008Date of Patent: November 22, 2011Assignee: JTEKT CorporationInventors: Kouji Kitahata, Masahiro Tabata, Ryuji Nakata
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Patent number: 8039423Abstract: Disclosed are a lubricant composition including a lubricating base oil, fine particles and a calcium sulfonate-based thickener, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus including the speed reduction gear. The invention reduces operating noise of the speed reduction gear, regardless of the amount of backlash that occurs on combining a small gear and a large gear and without a more complicated structure for the speed reduction gear, by action of the fine particles. Further, separation of oil is prevented, by action of the calcium sulfonate-based thickener of the lubricant composition, so that electric power steering apparatus noise within the inside of a car is reduced at a low cost.Type: GrantFiled: March 23, 2005Date of Patent: October 18, 2011Assignees: JTEKT Corporation, Kyodo Yushi Co., Ltd.Inventors: Kouji Kitahata, Fumiaki Kasahara, Yoshimasa Shirai, Takashi Okaniwa, Satoshi Yamazaki
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Publication number: 20110120797Abstract: A vehicle steering apparatus includes an actuator that generates a steering force, and a first speed reduction mechanism connected to the actuator. To the first speed reduction mechanism, a second speed reduction mechanism is connected. To the second speed reduction mechanism, a steering mechanism is connected. A sub-assembly including the actuator and the first speed reduction mechanism is configured.Type: ApplicationFiled: July 15, 2009Publication date: May 26, 2011Applicant: JTEKT CORPORATIONInventors: Kouji Kitahata, Shiro Nakano, Masaya Segawa, Yoshiharu Nogami
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Publication number: 20100236859Abstract: There provided a lubricant composition that without any excess increase of the steering torque of an electric power steering apparatus and without any generation of sliding noise, reduces rattling sound thereby excel in the effect of noise reduction in automobile compartment, and is capable of favorably sustaining the above effect even when continuously used in high-temperature environment for a prolonged period of time; a speed reduction gear using the lubricant composition; and an electric power steering apparatus. The lubricant composition includes buffer particles of a polyurethane resin synthesized by reacting a polycarbonate polyol, cross-linking agent having three or more active hydrogen groups per molecule and a polyisocyanate. The speed reduction gear (50) is filled with the lubricant composition. The electric power steering apparatus incorporates the speed reduction gear therein.Type: ApplicationFiled: November 17, 2006Publication date: September 23, 2010Applicant: JTEKT CorporationInventors: Kouji Kitahata, Naoki Uchida, Mitsuo Yoneda, Hiroaki Oka, Tomotaka Nakagawa, Masahiro Hayashi
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Patent number: 7709427Abstract: Disclosed are a lubricant composition to which is added as buffer particles to a lubricant polyurethane resin particles obtained by reacting and synthesizing long-chain polyol having a number-average molecular weight of not less than 500, a crosslinking agent having three or more active hydrogen groups in one molecule, and polyisocyanate as buffer particles, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, wherein noise produced by the speed reduction gear can be made lower than ever before irrespective of the magnitude of backlash in a case where a worm and a worm wheel are combined with each other and without complicating the configuration of the speed reduction gear by the buffer action of the buffer particles added to the lubricant composition, thereby making it possible to reduce noise produced in an automobile due to the electric power steering apparatus at low cost.Type: GrantFiled: March 17, 2005Date of Patent: May 4, 2010Assignees: Koyo Seiko Co., Ltd., Nippon Polyurethane Industry Co., Ltd.Inventors: Kouji Kitahata, Naoki Uchida, Mitsuo Yoneda, Masahiro Hayashi
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Publication number: 20090283353Abstract: A novel lubricant composition is provided, which is free from an increase in consistency, separation of its lubricant base oil, and leakage of the separated lubricant base oil from a speed reduction gear or the like even if a stress is repeatedly applied to the composition over a long period of time. A speed reduction gear employing the lubricant composition, and an electric power steering apparatus are also provided. The lubricant composition employs at least two types of thickeners including lithium stearate in combination, and has a worked penetration of not less than 355 (at 25° C.). The speed reduction gear 50 is filled with the lubricant composition containing minute particles, and the electric power steering apparatus includes the speed reduction gear.Type: ApplicationFiled: November 17, 2006Publication date: November 19, 2009Applicant: JTEKT CORPORATIONInventors: Kouji Kitahata, Fumiaki Kasahara, Yoshimasa Shirai
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Patent number: 7595095Abstract: A method of making a coated article is provided. The method includes electrostatically depositing powder onto a metallic article to be coated using an electrostatic spray gun while the metallic article is being rotated around its axis such that the powder is deposited around the entire circumference of the metallic article at least in a radially outward peripheral region having projections and depressions and that the powder deposited on top of the projections is larger in thickness than the powder deposited in other parts of the metallic article. Melting of the powder is performed by induction heating the metallic article to make a coating film adhere to the metallic article.Type: GrantFiled: February 14, 2006Date of Patent: September 29, 2009Assignee: Koyo Seiko Co.Inventors: Kouji Kitahata, Takeshi Tojo, Katsura Koyagi, Takanori Kurokawa, Atsuo Suehiro, Yoshifumi Niide, Kouichi Taniguchi, Shingo Nakamura
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Patent number: 7591341Abstract: An electric power steering apparatus is provided with a worm which is a driving gear interlocked with an electric motor for assisting steering, and a worm wheel which is a driven gear having an annular teeth body made of synthetic resin meshing with the worm and a metallic core body coupling the annular teeth body and is attached to the steering shaft. Protrusions are provided on a side surface of the annular teeth body in a face width direction at a plurality of circumferential positions from which a distance to a center of rotation is different from each other, and stirred lubricating fats and oils applied around the worm wheel. As a result, the lubricating fats and oils can be moved to between tooth surfaces of a meshing portion between the worm and worm wheel.Type: GrantFiled: January 23, 2007Date of Patent: September 22, 2009Assignee: JTEKT CorporationInventors: Yuuji Shimamoto, Keizo Arita, Kouji Kitahata, Naoki Uchida
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Publication number: 20080293598Abstract: A solid lubricating composition having resin material is disposed between an outer ring and an inner ring of a ball bearing. As the resin material contained in the solid lubricating composition, resin material having a property of being solidified when the resin material in a fluid state is irradiated with an ultraviolet beam is used.Type: ApplicationFiled: May 23, 2008Publication date: November 27, 2008Applicant: JTEKT CORPORATIONInventors: Kouji Kitahata, Masahiro Tabata, Ryuji Nakata
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Patent number: 7452850Abstract: Disclosed are a lubricant composition obtained by adding a buffer particles having an average particle diameter D1 of 50 ?m<D1?300 ?m to a lubricant, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, and noise produced in the speed reduction gear can be made lower than ever before irrespective of the magnitude of backlash in a case where a worm and a worm wheel are combined with each other and without complicating the configuration of the speed reduction gear by the buffer action of the buffer particles added to the lubricant composition, thereby making it possible to reduce noise produced in an automobile caused by the electric power steering apparatus at low cost.Type: GrantFiled: September 25, 2003Date of Patent: November 18, 2008Assignee: Jtekt CorporationInventors: Kouji Kitahata, Fumiaki Kasahara, Naoki Uchida, Noritake Ookawa, Hiroaki Murakami
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Publication number: 20070264077Abstract: Provided are a spline joint (1) where a section at which a male spline shaft (2) and a female spline shaft (3) mesh is filled with a lubricating agent composition containing a lubricating oil and buffer particles (B), and the lubricating agent composition. Impact caused by meshing of both spline shafts (2, 3) is buffered by the buffer particles (B) placed in the section at which both spline shafts (2, 3) mesh. As a result, chattering sound and sliding resistance can be stably reduced for a longer time without having wearing and peeling which occur in coating.Type: ApplicationFiled: June 27, 2005Publication date: November 15, 2007Applicant: JTEKT CorporationInventors: Kouji Kitahata, Fumiaki Kasahara, Yoshimasa Shirai
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Publication number: 20070193820Abstract: An electric power steering apparatus is provided with a worm which is a driving gear interlocked with an electric motor for assisting steering, and a worm wheel which is a driven gear having an annular teeth body made of synthetic resin meshing with the worm and a metallic core body coupling the annular teeth body and is attached to the steering shaft. Protrusions are provided on a side surface of the annular teeth body in a face width direction at a plurality of circumferential positions from which a distance to a center of rotation is different from each other, and stirred lubricating fats and oils applied around the worm wheel. As a result, the lubricating fats and oils can be moved to between tooth surfaces of a meshing portion between the worm and worm wheel.Type: ApplicationFiled: January 23, 2007Publication date: August 23, 2007Applicant: JTEKT CorporationInventors: Yuuji Shimamoto, Keizo Arita, Kouji Kitahata, Naoki Uchida
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Publication number: 20070180944Abstract: A lubricant composition comprising a lubricating base oil, fine particles and a calcium sulfonate-based thickener, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus comprising the speed reduction gear are disclosed. It is possible to reduce the operating noise of a speed reduction gear regardless of the amount of backlash that occurs on combining a small gear and a large gear without a more complicate structure of the speed reduction gear by an action of the fine particles while preventing separation of oil by an action of the calcium sulfonate-based thickener added to the lubricant composition, and thus the noise in the inside of car generated by the electric power steering apparatus can be reduced with a low cost.Type: ApplicationFiled: March 23, 2005Publication date: August 9, 2007Inventors: Kouji Kitahata, Fumiaki Kasahara, Yoshimasa Shirai, Takashi Okaniwa, Satoshi Yamazaki