Patents by Inventor Yoji Sato
Yoji Sato 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: 9046132Abstract: The present invention provides a grease composition having an excellent fretting wear resistance in a wide temperature region from low to high temperatures and particularly even at low temperatures and a rolling bearing in which the grease composition is packed. A grease composition (7) is packed inside a grease-packed bearing (1). The grease composition (7) contains base oil, a thickener, and an additive.Type: GrantFiled: September 9, 2011Date of Patent: June 2, 2015Assignee: NTN CORPORATIONInventors: Motohiro Ito, Yoji Sato, Hidenobu Mikami
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Publication number: 20140153854Abstract: A rolling bearing which is capable of preventing the rolling elements from dropping out from between the inner and the outer rings even when the separators have been worn to an advanced stage. A rolling bearing includes: a plurality of rolling elements arranged between an inner and an outer rings; and a plurality of prismatic separators disposed in a circumferential direction between the rolling elements. The separator includes integrally therewith a metal band on at least one of its outer surfaces including those which face the inner or the outer ring, or at least one of its axial side surfaces, excluding however, surfaces which face the circumferential direction and make contact with the rolling elements. The metal band has a narrower width than a width of the separator in the circumferential direction, and prevents wear of the separator from advancing beyond a certain extent.Type: ApplicationFiled: July 4, 2012Publication date: June 5, 2014Inventors: Miki Arihana, Naoaki Tsuji, Yoji Sato, Hideyuki Tsutsui, Kouya Oohira
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Patent number: 8728621Abstract: The present invention provides a hard multilayer film formed body which has an intermediate layer excellent in its adhesion to a base material and a DLC film which is a surface layer excellent in its wear resistance, prevents peeling from occurring between the DLC film and the intermediate layer, and is excellent in its wear resistance and a method for producing the same. A hard multilayer film formed body 1 consists of a multilayer film formed on a surface of a base material 2 consisting of a cemented carbide material or a ferrous material. The multilayer film has (1) a film, composed mainly of DLC, which is formed as a surface layer 5 of the multilayer film; (2) an intermediate layer 3, composed mainly of a metallic material, which is formed between the surface layer 5 and the base material 2; and (3) a stress relaxation layer 4, composed mainly of carbon, which is formed between the intermediate layer 3 and the surface layer 5.Type: GrantFiled: October 29, 2009Date of Patent: May 20, 2014Assignee: NTN CorporationInventors: Kouya Oohira, Naoko Ito, Yoji Sato, Hideyuki Tsutsui
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Publication number: 20140126894Abstract: Provided is a method of annealing a metal member, including: disposing a first heater in an inner space of a hollow cylindrical metal member having an inner peripheral surface provided with plural teeth protruding toward a central direction, the first heater radiating infrared light and being disposed so as to extend parallel to a direction of a central axis of the metal member; heating the metal member from the inner space with the first heater; and gradually cooling the metal member after heating.Type: ApplicationFiled: January 22, 2013Publication date: May 8, 2014Inventors: Yasuo Ohsugi, Tsuyoshi Hamaya, Satoshi Arai, Eiji Yanagida, Shinya Sano, Masaaki Konda, Toshimitsu Takahashi, Yoji Sato
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Publication number: 20130170777Abstract: The present invention provides a grease composition having an excellent fretting wear resistance in a wide temperature region from low to high temperatures and particularly even at low temperatures and a rolling bearing in which the grease composition is packed. A grease composition (7) is packed inside a grease-packed bearing (1). The grease composition (7) contains base oil, a thickener, and an additive. The additive contains at least, one kind selected from among a phosphite ester shown by a chemical formula (1) or a phosphite ester shown by a chemical formula (2). The content of the phosphite ester is 0.5 to 4 parts by weight for 100 parts by weight which is the total of the amount of the base oil and that of the thickener. (In the chemical formulas (1) and (2), R1, R2, R3, R4, and R5 denote a methyl group or an ethyl group respectively. R1 and R2 are the same group or different groups. R3, R4, and R5 are the same group or different groups).Type: ApplicationFiled: September 9, 2011Publication date: July 4, 2013Applicant: NTN CORPORATIONInventors: Motohiro Ito, Yoji Sato, Hidenobu Mikami
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Patent number: 8449200Abstract: A resin composition for a sliding member is difficult to peel and whose component is difficult to elute when the resin composition is formed as a film on a surface of a mechanical part, even though the resin composition is used in environment where the sliding member contacts lubricating oil containing a sulfur-based additive or in atmosphere containing a sulfur-based compound. A resin composition for a sliding member to be used for a mechanical part having a surface thereof formed of said sliding member. The resin composition contains polyamide-imide resin having an elongation percentage of 60% to 120%, fullerene, and at least one disulfide selected from among molybdenum disulfide and tungsten disulfide. 0.1 to 10 vol % of the fullerene and 0.5 to 20 vol % of the disulfide are contained in an entirety of the resin composition.Type: GrantFiled: May 19, 2008Date of Patent: May 28, 2013Assignee: NTN CorporationInventors: Masaki Egami, Yoji Sato, Taemi Okuda
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Patent number: 8153568Abstract: The present invention provides water-resistant grease which improves the resistance to peeling which occurs from the surface of a bearing composed of carbon steel for machine structural use or the like even in a strict lubricating condition in which water may penetrate into the water-resistant grease during the operation of the bearing, and a rolling bearing and a hub bearing which use the water-resistant grease and have a long life. The water-resistant grease is composed of non-water-based base oil, a thickener, and a water dispersant used as an additive. The saturated amount of water dispersible in the water-resistant grease is 30 to 60 wt %. The water dispersant capable of dispersing the water in the water-resistant grease is a surface active agent. The non-water-based base oil is mineral oil. The thickener is a urea-based compound. The present invention also provides a rolling bearing and a hub bearing in which the water-resistant grease is enclosed.Type: GrantFiled: September 28, 2006Date of Patent: April 10, 2012Assignee: NTN CorporationInventors: Yoji Sato, Masaki Egami
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Patent number: 8005400Abstract: In a tandem type image formation apparatus, a drum drive unit which always simultaneously drives respective photoreceptor drums, is assembled such that it is possible to synchronize cycles of rotational speed fluctuations of the respective photoreceptor drums in assembling. In this manner, the photoreceptor drums rotate so as to synchronize the cycles of rotational speed fluctuations of the photoreceptor drums even after assembling. Therefore, a phase difference in the cycles of rotational speed fluctuations of the photoreceptor drums is determined, and the photoreceptor drums are assembled so as to be shifted by the phase difference.Type: GrantFiled: August 14, 2009Date of Patent: August 23, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventor: Yoji Sato
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Publication number: 20110195265Abstract: The present invention provides a hard multilayer film formed body which has an intermediate layer excellent in its adhesion to a base material and a DLC film which is a surface layer excellent in its wear resistance, prevents peeling from occurring between the DLC film and the intermediate layer, and is excellent in its wear resistance and a method for producing the same. A hard multilayer film formed body 1 consists of a multilayer film formed on a surface of a base material 2 consisting of a cemented carbide material or a ferrous material. The multilayer film has (1) a film, composed mainly of DLC, which is formed as a surface layer 5 of the multilayer film; (2) an intermediate layer 3, composed mainly of a metallic material, which is formed between the surface layer 5 and the base material 2; and (3) a stress relaxation layer 4, composed mainly of carbon, which is formed between the intermediate layer 3 and the surface layer 5.Type: ApplicationFiled: October 29, 2009Publication date: August 11, 2011Inventors: Kouya Oohira, Naoko Ito, Yoji Sato, Hideyuki Tsutsui
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Patent number: 7945192Abstract: A drive transmitting mechanism configured to rotate the photosensitive drum of a color copier has a driving shaft, a driven shaft, and first and second coupling members. The first coupling member has a projection extending in a diametrical direction. The first coupling member is attached to the driving shaft, with amount of freedom to oscillate in a direction intersecting at right angles to the lengthwise direction of the projection. The second coupling member has a recess in which the projection is fitted. The second coupling member is attached to the driven shaft, with amount of freedom to oscillate in the lengthwise direction of the recess. The first and second coupling members oscillate in the diametrical direction and slide on the contacting surface in a diametrical direction intersecting at right angles to the diametrical direction, thus suppressing the rotational speed change of the driven shaft, which results from the de-centering and declination between the driving shaft and the driven shaft.Type: GrantFiled: October 6, 2009Date of Patent: May 17, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventor: Yoji Sato
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Publication number: 20100142872Abstract: A resin composition for a sliding member is difficult to peel and whose component is difficult to elute when the resin composition is formed as a film on a surface of a mechanical part, even though the resin composition is used in environment where the sliding member contacts lubricating oil containing a sulfur-based additive or in atmosphere containing a sulfur-based compound. A resin composition for a sliding member to be used for a mechanical part having a surface thereof formed of said sliding member. The resin composition contains polyamide-imide resin having an elongation percentage of 60% to 120%, fullerene, and at least one disulfide selected from among molybdenum disulfide and tungsten disulfide. 0.1 to 10 vol % of the fullerene and 0.5 to 20 vol % of the disulfide are contained in an entirety of the resin composition.Type: ApplicationFiled: May 19, 2008Publication date: June 10, 2010Applicant: NTN CORPORATIONInventors: Masaki Egami, Yoji Sato, Taemi Okuda
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Publication number: 20100129021Abstract: It is an object of the present invention to provide a rolling bearing in which a film formed on a surface of a retainer is difficult to peel or a metal component is difficult to dissolve even when the rolling bearing is used in environment where the rolling bearing contacts lubricating oil containing sulfur-based additives. A rolling bearing (1) having a plurality of rolling elements (3) and a retainer (2) retaining the rolling elements (3) is used in environment in which the rolling bearing contacts lubricating oil containing sulfur-based additives. A metal film difficult to peel or dissolve in the environment is formed on a surface of the retainer (2). The metal film is a copper alloy film and particularly consists of a copper-tin alloy plated film.Type: ApplicationFiled: April 18, 2008Publication date: May 27, 2010Applicant: NTN CORPORATIONInventors: Masaki Egami, Yoji Sato, Taemi Okuda
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Patent number: 7684734Abstract: In a tandem type image formation apparatus, a drum drive unit which always simultaneously drives respective photoreceptor drums, is assembled such that it is possible to synchronize cycles of rotational speed fluctuations of the respective photoreceptor drums in assembling. In this manner, the photoreceptor drums rotate so as to synchronize the cycles of rotational speed fluctuations of the photoreceptor drums even after assembling. Therefore, a phase difference in the cycles of rotational speed fluctuations of the photoreceptor drums is determined, and the photoreceptor drums are assembled so as to be shifted by the phase difference.Type: GrantFiled: April 27, 2007Date of Patent: March 23, 2010Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventor: Yoji Sato
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Publication number: 20100021207Abstract: A drive transmitting mechanism configured to rotate the photosensitive drum of a color copier has a driving shaft, a driven shaft, and first and second coupling members. The first coupling member has a projection extending in a diametrical direction. The first coupling member is attached to the driving shaft, with amount of freedom to oscillate in a direction intersecting at right angles to the lengthwise direction of the projection. The second coupling member has a recess in which the projection is fitted. The second coupling member is attached to the driven shaft, with amount of freedom to oscillate in the lengthwise direction of the recess. The first and second coupling members oscillate in the diametrical direction and slide on the contacting surface in a diametrical direction intersecting at right angles to the diametrical direction, thus suppressing the rotational speed change of the driven shaft, which results from the de-centering and declination between the driving shaft and the driven shaft.Type: ApplicationFiled: October 6, 2009Publication date: January 28, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventor: Yoji Sato
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Publication number: 20100003053Abstract: In a tandem type image formation apparatus, a drum drive unit which always simultaneously drives respective photoreceptor drums, is assembled such that it is possible to synchronize cycles of rotational speed fluctuations of the respective photoreceptor drums in assembling. In this manner, the photoreceptor drums rotate so as to synchronize the cycles of rotational speed fluctuations of the photoreceptor drums even after assembling. Therefore, a phase difference in the cycles of rotational speed fluctuations of the photoreceptor drums is determined, and the photoreceptor drums are assembled so as to be shifted by the phase difference.Type: ApplicationFiled: August 14, 2009Publication date: January 7, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventor: Yoji Sato
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Patent number: 7623811Abstract: A drive transmitting mechanism configured to rotate the photosensitive drum of a color copier has a driving shaft, a driven shaft, and first and second coupling members. The first coupling member has a projection extending in a diametrical direction. The first coupling member is attached to the driving shaft, with amount of freedom to oscillate in a direction intersecting at right angles to the lengthwise direction of the projection. The second coupling member has a recess in which the projection is fitted. The second coupling member is attached to the driven shaft, with amount of freedom to oscillate in the lengthwise direction of the recess. The first and second coupling members oscillate in the diametrical direction and slide on the contacting surface in a diametrical direction intersecting at right angles to the diametrical direction, thus suppressing the rotational speed change of the driven shaft, which results from the de-centering and declination between the driving shaft and the driven shaft.Type: GrantFiled: February 20, 2007Date of Patent: November 24, 2009Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventor: Yoji Sato
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Patent number: 7600980Abstract: A cooling fan has a metal spacer, a boss made of Nylon integrally formed with the spacer by an insert molding and seven blades extending outward therefrom. A skew angle of about 30 degrees is provided at a connecting portion or a base end portion of the blade to the boss so as to be inclined backward in relation to a rotating direction of the cooling fan. To the contrary, a skew angle of about 8 degrees is provided at a portion extending from the connecting portion to the leading end of the blade so as to be inclined forward in relation to the rotating direction.Type: GrantFiled: May 18, 2005Date of Patent: October 13, 2009Assignee: Aisin Kako Kabushiki KaishaInventor: Yoji Sato
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Publication number: 20090136170Abstract: The present invention provides water-resistant grease which improves the resistance to peeling which occurs from the surface of a bearing composed of carbon steel for machine structural use or the like even in a strict lubricating condition in which water may penetrate into the water-resistant grease during the operation of the bearing, and a rolling bearing and a hub bearing which use the water-resistant grease and have a long life. The water-resistant grease is composed of non-water-based base oil, a thickener, and a water dispersant used as an additive. The saturated amount of water dispersible in the water-resistant grease is 30 to 60 wt %. The water dispersant capable of dispersing the water in the water-resistant grease is a surface active agent. The non-water-based base oil is mineral oil. The thickener is a urea-based compound. The present invention also provides a rolling bearing and a hub bearing in which the water-resistant grease is enclosed.Type: ApplicationFiled: September 28, 2006Publication date: May 28, 2009Applicant: NTN CORPORATIONInventors: Yoji Sato, Masaki Egami
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Patent number: 7383015Abstract: On a relay guide neighboring with a paper supply tray, a guide rib rotated and projected from a guide face is installed, and the width of sheets is controlled, thus an occurrence of skewing of various sheets supplied from a paper supply tray is prevented, and the conveyability of sheets is improved, and the image quality formed on the sheets is improved.Type: GrantFiled: June 30, 2005Date of Patent: June 3, 2008Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventor: Yoji Sato
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Publication number: 20070253735Abstract: In a tandem type image formation apparatus, a drum drive unit which always simultaneously drives respective photoreceptor drums, is assembled such that it is possible to synchronize cycles of rotational speed fluctuations of the respective photoreceptor drums in assembling. In this manner, the photoreceptor drums rotate so as to synchronize the cycles of rotational speed fluctuations of the photoreceptor drums even after assembling. Therefore, a phase difference in the cycles of rotational speed fluctuations of the photoreceptor drums is determined, and the photoreceptor drums are assembled so as to be shifted by the phase difference.Type: ApplicationFiled: April 27, 2007Publication date: November 1, 2007Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHAInventor: Yoji Sato