Patents by Inventor Motohiro Miyasaka
Motohiro Miyasaka 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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Publication number: 20210084886Abstract: A wild animal repulsing apparatus for intimidating and repulsing wild animals, includes a light emitting unit having a plurality of light emitting elements, a sound generation unit for generating intimidating sound used to threaten the wild animals, a control unit for controlling light emitting operations of the light emitting unit and sound generating operations of the sound generation unit, and an appearance providing unit having an outer shape resembling in appearance of an animal and being capable of arranging so that two of the light emitting elements are appeared as eyes of the animal. The control unit controls the light emitting unit to blink the plurality of light emitting elements at a frequency of 18-24 Hz, and controls the sound generation unit so as to generate the intimidating sound with 80 dB or more at stopping interval of 15 minutes or more when no wild animal is appeared.Type: ApplicationFiled: December 2, 2020Publication date: March 25, 2021Applicant: Ohta Seiki CO., LTD.Inventors: Yuji Ohta, Syushi Sasaki, Motohiro Miyasaka
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Patent number: 7553445Abstract: Disclosed is a manufacturing process of a sintered iron-copper base porous alloy and of an oil-impregnated sintered bearings, having the steps of: preparing a mixed powder comprising an iron powder, and at least one of a copper powder and a copper alloy powder; forming the mixed powder into a green compact; and sintering the green compact to obtain a sintered iron-copper base porous alloy. The iron powder contains a porous iron powder which has a particle size of 177 microns or less and a specific surface area of 110 to 500 m2/kg according to a gas adsorption method. The sintered compact has high intercommunicating porosity and low permeability, and it is sized to prepare the sintered bearing into which a lubricating oil is impregnated.Type: GrantFiled: September 9, 2004Date of Patent: June 30, 2009Assignee: Hitachi Powdered Metals Co., Ltd.Inventor: Motohiro Miyasaka
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Patent number: 7234871Abstract: A sliding bearing which is suitable for and durable in the use under high load of sliding in rocking motion, and the structure of bearing is not complicated so as to facilitate the manufacturing. The alloy used for making the bearing is composed of iron-based sintered alloy having quenched structure, and the bearing surface is provided with inclined grooves of an inclination angle of 10 to 40° relative to the direction perpendicular to the sliding direction and a width of 2 to 8 mm and the area of inclined grooves is 50% or less of the total inner bearing surface and an imaginary line perpendicular to the sliding direction crosses both the inclined groove and the bearing surface at any position of the inner surface of bearing. When the bearing is used, at least the inclined grooves are impregnated with a lubricant.Type: GrantFiled: June 22, 2005Date of Patent: June 26, 2007Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Kazuo Maruyama, Motohiro Miyasaka, Osamu Mawatari
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Publication number: 20060269179Abstract: An object of the present invention is to provide an oil-impregnated sintered sliding bearing which has a large amount of the lubricating oil as a bearing element which has long life, has a small amount of scattered and lost lubricating oil, has a simple structure, and takes up a small space for a bearing. An oil-impregnated sintered sliding bearing includes: an axis; plural porous sintered compacts joined with each other by sizing; a cavity between the sintered compacts at an axial direction center portion; and a gap which continuously extends from an end portion of the cavity and has a width narrower than the cavity, wherein the gap opens to an end surface or a peripheral surface of the bearing.Type: ApplicationFiled: June 9, 2004Publication date: November 30, 2006Inventors: Motohiro Miyasaka, Hiroyuki Yoshida, Michio Okada, Tooru Tsukuda, Mitsunari Ishizaki, Norihito Mizote, Hidetaka Sando
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Patent number: 7014367Abstract: An oil-impregnated sintered sliding bearing formed of a porous iron-based sintered alloy with quenched structure and receiving a high surface pressure capable of reducing the number of finishing steps by cutting and grinding and providing a bearing performance equivalent to or higher than that of conventional bearings, wherein a plurality of ridge-and-groove lines having a height difference of 2 to 12.5 ?m and extending in circumferential direction are axially arranged in parallel with each other by boring the bearing surface thereof to form a wavy surface in axial direction, and the portion thereof deeper by 10 to 60 ?m from the outer layer of the bearing surface is formed dense to seal surface pores so as to reduce the pores opening to the outer surface to 1 to 10 percent by area, whereby the bearing can be used at a surface pressure of 6 kgf/mm2 (58.5 MPa) or higher and a sliding speed of 2 to 5 cm/s.Type: GrantFiled: January 20, 2003Date of Patent: March 21, 2006Assignees: Hitachi Powered Metals Co., Ltd., Hitachi Construction Machinery Co., Ltd.Inventors: Motohiro Miyasaka, Kazuo Maruyama, Michiharu Mogami, Junichi Kobayashi, Hideki Akita, Osamu Gokita
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Publication number: 20050286822Abstract: A sliding bearing which is suitable for and durable in the use under high load of sliding in rocking motion, and the structure of bearing is not complicated so as to facilitate the manufacturing. The alloy used for making the bearing is composed of iron-based sintered alloy having quenched structure, and the bearing surface is provided with inclined grooves of an inclination angle of 10 to 40° relative to the direction perpendicular to the sliding direction and a width of 2 to 8 mm and the area of inclined grooves is 50% or less of the total inner bearing surface and an imaginary line perpendicular to the sliding direction crosses both the inclined groove and the bearing surface at any position of the inner surface of bearing. When the bearing is used, at least the inclined grooves are impregnated with a lubricant.Type: ApplicationFiled: June 22, 2005Publication date: December 29, 2005Inventors: Kazuo Maruyama, Motohiro Miyasaka, Osamu Mawatari
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Publication number: 20050078894Abstract: An oil-impregnated sintered sliding bearing formed of a porous iron-based sintered alloy with quenched structure and receiving a high surface pressure capable of reducing the number of finishing steps by cutting and grinding and providing a bearing performance equivalent to or higher than that of conventional bearings, wherein a plurality of ridge-and-groove lines having a height difference of 2 to 12.5 ?m and extending in circumferential direction are axially arranged in parallel with each other by boring the bearing surface thereof to form a wavy surface in axial direction, and the portion thereof deeper by 10 to 60 ?m from the outer layer of the bearing surface is formed dense to seal surface pores so as to reduce the pores opening to the outer surface to 1 to 10 percent by area, whereby the bearing can be used at a surface pressure of 6 kgf/mm2 (58.5 MPa) or higher and a sliding speed of 2 to 5 cm/s.Type: ApplicationFiled: January 20, 2003Publication date: April 14, 2005Inventors: Motohiro Miyasaka, Kazuo Maruyama, Michiharu Mogami, Junichi Kobayashi, Hideki Akita, Osamu Gokita
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Publication number: 20050063856Abstract: Disclosed is a manufacturing process of a sintered iron-copper base porous alloy and of an oil-impregnated sintered bearings, having the steps of: preparing a mixed powder comprising an iron powder, and at least one of a copper powder and a copper alloy powder; forming the mixed powder into a green compact; and sintering the green compact to obtain a sintered iron-copper base porous alloy. The iron powder contains a porous iron powder which has a particle size of 177 microns or less and a specific surface area of 110 to 500 m2/kg according to a gas adsorption method. The sintered compact has high intercommunicating porosity and low permeability, and it is sized to prepare the sintered bearing into which a lubricating oil is impregnated.Type: ApplicationFiled: September 9, 2004Publication date: March 24, 2005Inventor: Motohiro Miyasaka
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Patent number: 6574186Abstract: A conventional plain bearing, in which dynamic pressure is generated by means of lubricating oil, has been assembled in such a way that the whole bearing device is assembled and then the lubricating oil is poured in the interior. As a result, residual air bubbles are produced to cause lowering of the dynamic pressure. The present invention uses magnetic fluid as lubricating oil, and adopts, for enclosing the fluid, a method in which at the time of assembling a spindle motor, a permanent magnet is used, magnetic fluid of a specified amount is previously held in a bearing unit by the magnetic attraction force, and after the insertion of a shaft, the magnetic fluid is supplied into a narrow space of a bearing part by a capillary attraction.Type: GrantFiled: November 30, 2000Date of Patent: June 3, 2003Assignees: Hitachi, Ltd., Hitachi Powdered Metals co., Ltd.Inventors: Katsutoshi Nii, Toshikazu Takehana, Motohiro Miyasaka
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Publication number: 20020037118Abstract: The invention relates to a composite type bearing in which bearing portions (11a, 12a) slidably supporting a rotary axis (S) are provided in both ends in an axial direction, and a middle escape portion (15) not being in contact with the rotary axis and a cylindrical magnet (13) are provided between the bearing portions (11a, 12a). The composite type sintered porous bearing is characterized in that at least two cylindrical sintered porous members (11, 12, 14) are fitted and joined so as to be united, and the magnet (13) is assembled within an outer peripheral space (16) in which an outer diameter between both end sides in an axial direction is formed to be smaller than an outer diameter of the both end sides.Type: ApplicationFiled: February 21, 2001Publication date: March 28, 2002Inventor: Motohiro Miyasaka
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Patent number: 6361737Abstract: A cylindrical sintered material is placed in a cavity composed of die, a core disposed in the center of the die, and a pair of upper and lower punches provided within the die and compressed by the upper and lower punches. A gap is provided between an internal circumferential portion of the sintered material and an external circumferential portion of the core. Consequently, when the sintered material is compressed, plastic flow is produced at both ends of the sintered material so that an internal circumferential portions at corresponding portions protrude inward in a radius direction till the internal circumferential portions come into contact with the core, so that slide portions are formed.Type: GrantFiled: January 31, 2000Date of Patent: March 26, 2002Assignee: Hitachi Powdered Metal Co., Ltd.Inventors: Motohiro Miyasaka, Toshikazu Takehana
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Publication number: 20010002898Abstract: A conventional plain bearing, in which dynamic pressure is generated by means of lubricating oil, has been assembled in such a way that the whole bearing device is assembled and then the lubricating oil is poured in the interior. As a result, residual air bubbles are produced to cause lowering of the dynamic pressure. The present invention uses magnetic fluid as lubricating oil, and adopts, for enclosing the fluid, a method in which at the time of assembling a spindle motor, a permanent magnet is used, magnetic fluid of a specified amount is previously held in a bearing unit by the magnetic attraction force, and after the insertion of a shaft, the magnetic fluid is supplied into a narrow space of a bearing part by a capillary attraction.Type: ApplicationFiled: November 30, 2000Publication date: June 7, 2001Inventors: Katsutoshi Nii, Toshikazu Takehana, Motohiro Miyasaka
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Patent number: 6119346Abstract: A bearing comprising different materials having oil-filled pores in them has a relief space in the middle section which is not provided by machining. The materials are different, have different characteristics, and bear different portions of load the bearing supports, resulting in longer bearing life and reduced noise. Materials 1 and 2 are separately formed and sintered in such a way that material 1 has smaller pores in it and can support higher load, material 2 has larger pores in it and can support lower load, and an end portion of each material is stepped so that material 1 can be partially inserted into material 2 and a relief space is provided on the inner periphery of material 1. The materials 1 and 2 are then joined together into one piece, and the one piece is placed in a sizing die and pressed. The sized one piece is a strong one-piece bearing having an accurate inside diameter and good concentric alignment.Type: GrantFiled: January 21, 1999Date of Patent: September 19, 2000Assignees: Hitachi Powdered Metals Co., Ltd, Matsushita Electric Industrial Co., Ltd.Inventors: Motohiro Miyasaka, Makoto Kondo, Shigeru Otsuka
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Patent number: 6049983Abstract: A cylindrical sintered material is placed in a cavity composed of die, a core disposed in the center of the die, and a pair of upper and lower punches provided within the die and compressed by the upper and lower punches. A gap is provided between an internal circumferential portion of the sintered material and an external circumferential portion of the core. Consequently, when the sintered material is compressed, plastic flow is produced at both ends of the sintered material so that an internal circumferential portions at corresponding portions protrude inward in a radius direction till the internal circumferential portions come into contact with the core, so that slide portions are formed.Type: GrantFiled: July 31, 1997Date of Patent: April 18, 2000Assignee: Hitachi Powdered Metal Co. Ltd.Inventors: Motohiro Miyasaka, Toshikazu Takehana
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Patent number: 5932946Abstract: An improved porous bearing and a motor which is provided with the porous bearing in which the friction losses and reflection of shaft are reduced, noises caused by the vibrations are avoided with low cogging or low jitter, and in addition, the manufacturing process is simplified to obtain long-life products at low cost. The number (C) of grooves of the porous bearing meets at least one of the following equations:nA+mB-C.noteq.0, nA-C.noteq.0 and mB-C.noteq.0wherein A is the number of magnetic poles of the motor magnet, B is the number of the slots of the armature, and n and m are integers, respectively.Type: GrantFiled: January 14, 1998Date of Patent: August 3, 1999Assignees: Hitachi Powdered Metals Co., Ltd, Matsushita Electric Industrial Co., Ltd.Inventors: Motohiro Miyasaka, Makoto Kondo, Shigeru Otsuka
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Patent number: 5895119Abstract: A bearing comprising different materials having oil-filled pores in them has a relief space in the middle section which is not provided by machining. The materials are different, have different characteristics, and bear different portions of load the bearing supports, resulting in longer bearing life and reduced noise. Materials 1 and 2 are separately formed and sintered in such a way that material 1 has smaller pores in it and can support higher load, material 2 has larger pores in it and can support lower load, and an end portion of each material is stepped so that material 1 can be partially inserted into material 2 and a relief space is provided on the inner periphery of material 1. The materials 1 and 2 are then joined together into one piece, and the one piece is placed in a sizing die and pressed. The sized one piece is a strong one-piece bearing having an accurate inside diameter and good concentric alignment.Type: GrantFiled: November 27, 1996Date of Patent: April 20, 1999Assignees: Hitachi Powered Metals Co., Ltd., Matsushita Electric Industrial Co., Ltd.Inventors: Motohiro Miyasaka, Makoto Kondo, Shigeru Otsuka
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Patent number: 5834870Abstract: An oil impregnated porous bearing unit includes an arrangement wherein an oil impregnated porous bearing containing ferro-fluid is fixed in a non-magnetizable housing, a ring shaped permanent magnet is disposed so that the ferro-fluid will exist in a gap between a rotary shaft, whereon the ring shaped permanent magnet is fixed, and the oil impregnated porous bearing, and the ferro-fluid circulates between a slide plane of the bearing and a body of the oil impregnated porous bearing with rotation of the rotary shaft by utilizing the magnetic attractive force of the permanent magnet and a capillary phenomenon in the oil impregnated porous bearing.Type: GrantFiled: May 19, 1997Date of Patent: November 10, 1998Assignee: Hitachi, Ltd.Inventors: Hidekazu Tokushima, Motohiro Miyasaka, Michihiro Aizawa, Hideo Shikata, Katsutoshi Nii
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Patent number: 5821655Abstract: A magnetic fluid bearing unit has a bearing housing, a bearing member having magnetic fluid as a lubricating agent, a rotary body rotatively supported by the bearing member, an upper permanent magnet arranged inside the bearing housing, and a lower permanent magnet arranged inside the bearing housing, the bearing member being sandwiched by the upper permanent magnet and the lower permanent magnet. The bearing member is a radial porous oil-containing bearing member in which the magnetic fluid is impregnated. The upper permanent magnet is set to have one direction of magnetic pole orientation, and the lower permanent magnet is set to have the same direction of magnetic pole orientation as the upper permanent magnet. The bearing member is sandwiched by the upper permanent magnet and the lower permanent magnet to confine the magnetic fluid. Over a wide range of rotation speeds, the leakage and the scattering of the magnetic fluid from the bearing unit can be prevented.Type: GrantFiled: January 24, 1997Date of Patent: October 13, 1998Assignees: Hitachi, Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Hidekazu Tokushima, Motohiro Miyasaka, Michihiro Aizawa, Hideo Shikata, Katsutoshi Nii
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Patent number: 5810479Abstract: A hydrodynamic thrust porous bearing having excellent sliding characteristics under the use conditions of not only radial load but also thrust load, which bearing is approximately cylindrical in configuration and receives thrust load on its axial end face and is characterized in that the bearing includes protruded portions disposed radially relative to its center, tapered portions formed on at least one side of the protruded portions, and depressed portions defined by the bottom part of the tapered portions in at least three positions in the thrust receiving axial end face, and the bearing further includes grooves in the inner peripheral surface at the positions corresponding to the depressed portions.Type: GrantFiled: March 7, 1997Date of Patent: September 22, 1998Assignees: Hitachi Powdered Metals Co., Ltd., Matsushita Electric Industrial Co., Ltd.Inventors: Motohiro Miyasaka, Makoto Kondo, Shigeru Otsuka
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Patent number: 5746516Abstract: An improved porous bearing and a motor which is provided with the porous bearing in which the friction losses and reflection of shaft are reduced, noises caused by the vibrations are avoided with low cogging or low jitter, and in addition, the manufacturing process is simplified to obtain long-life products at low cost. The number (C) of grooves of the porous bearing meets at least one of the following equations:nA+mB-C.noteq.0, nA-C.noteq.0 and mB-C.noteq.0wherein A is the number of magnetic poles of the motor magnet, B is the number of the slots of the armature, and n and m are integers, respectively.Type: GrantFiled: August 8, 1996Date of Patent: May 5, 1998Assignees: Hitachi Powdered Metals Co., Ltd., Matsushita Electric Industrial Co., Ltd.Inventors: Motohiro Miyasaka, Makoto Kondo, Shigeru Otsuka