Patents by Inventor Masachi Hosoya
Masachi Hosoya 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: 20160223019Abstract: There is provided a rolling bearing used in a liquefied gas environment or in an extremely low temperature, wherein an inner ring and an outer ring are made of steel material which is any one of bearing steel, stainless steel, high-speed tool steel and cemented steel, and a rolling element of the rolling bearing is made of ceramic having a coefficient of linear expansion of 70% to 105% of a coefficient of linear expansion of the steel material forming the inner ring and outer ring. A liquefied gas pump including the rolling bearing is also provided. Further, there is provided a cage which contains PTFE, a fibrous reinforcing material and a solid lubricant, and which is suitable for the above rolling bearing or the like.Type: ApplicationFiled: October 8, 2014Publication date: August 4, 2016Applicant: NSK LTD.Inventors: Toyohisa Yamamoto, Masachi Hosoya
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Publication number: 20140321776Abstract: There are provided a self-lubricating composite material capable of obtaining a necessary strength at a mixing ratio of a solid lubricant such as molybdenum disulfide (MoS2) of 60 mass % or greater; and a rolling bearing, a linear motion device, a ball screw device, a linear motion guide device, and a transport device using the same. To that end, a self-lubricating composite material which is material used in a solid-lubricant spacer (6) of a rolling bearing (1) contains 60 mass % to 80 mass % of molybdenum disulfide (MoS2) and a balance containing iron (Fe).Type: ApplicationFiled: January 18, 2013Publication date: October 30, 2014Inventors: Masachi Hosoya, Shin Niizeki, Tsuyoshi Nakai
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Patent number: 8016490Abstract: A thin-wall bearing, comprising a retainer (4) formed in a divided type having a plurality of resin plate-like members (5), (5), . . . curved along an inner ring (1) and an outer ring (2). The retainer (4) comprises pockets (6) opening to the axial end part thereof and rollingly holding balls (3). Slit-like through holes (14) extending in the axial direction and opening to the axial end part where the opening parts (7) of the pockets (6) are positioned are formed at the center parts of pillars (10) between the pockets (6) and (6) adjacent to each other. As a result, the thin-wall bearing can have excellent lubricity.Type: GrantFiled: January 31, 2006Date of Patent: September 13, 2011Assignee: NSK Ltd.Inventors: Masachi Hosoya, Toshiaki Yamaguchi, Tsuyoshi Saitou, Hiroyuki Itou, Yasushi Tomizuka, Toyohisa Yamamoto
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Publication number: 20070297705Abstract: A thin-wall bearing, comprising a retainer (4) formed in a divided type having a plurality of resin plate-like members (5), (5), . . . curved along an inner ring (1) and an outer ring (2). The retainer (4) comprises pockets (6) opening to the axial end part thereof and rollingly holding balls (3). Slit-like through holes (14) extending in the axial direction and opening to the axial end part where the opening parts (7) of the pockets (6) are positioned are formed at the center parts of pillars (10) between the pockets (6) and (6) adjacent to each other. As a result, the thin-wall bearing can have excellent lubricity.Type: ApplicationFiled: January 31, 2006Publication date: December 27, 2007Applicant: NSK Ltd.Inventors: Masachi Hosoya, Toshiaki Yamaguchi, Tsuyoshi Saitou, Hiroyuki Itou, Yasushi Tomizuka, Toyohisa Yamamoto
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Patent number: 6474652Abstract: A shaft seal device is provided which is capable of sealing a rotary shaft in a positive and reliable manner without requiring a periodical lubricant-supplying operation, and is free from contamination of its environment, products, etc. by splashing of excess lubricant leaking from the oil seal lip. An annular sealing channel is formed in at least one of the opposite ends of a housing of a bearing unit, in which is accommodated an annular lubricant-bearing polymer member fitted on the rotary shaft. The polymer member has an inside diameter substantially equal to an outer diameter of the rotary shaft at an initial stage of rotation of the rotary shaft. The polymer member has at least part of opposite end surfaces or outer peripheral portion thereof disposed substantially in contact with opposite lateral wall surfaces of the sealing channel.Type: GrantFiled: October 18, 1999Date of Patent: November 5, 2002Assignee: NSK Ltd.Inventors: Masachi Hosoya, Kazuaki Konishi, Toshikazu Yabe
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Patent number: 5332460Abstract: A seal ring for magnetic fluid seal device, comprising an annular magnet covered with heat activated resin and an annular pole piece stacked and pressed and bonded coaxially with said annular magnet at a temperature higher than heat activated temperature.Type: GrantFiled: October 2, 1990Date of Patent: July 26, 1994Assignee: Nippon Seiko Kabushiki KaishaInventor: Masachi Hosoya
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Patent number: 5051853Abstract: A magnetic disc device. A seal member consisting of ring magnet and ring-shaped pole pieces is built in a shaft or housing to which disc is fixed. The inner end of the seal member is fixed to the shaft side, and the outer end forms, between the housing, a gap in which electroconductive magnetic fluid is kept. The contact areas of the electroconductive magnetic fluid with the pole pieces and the housing are made remarkedly large, so that not only grounding of the static electricity generated on the disc but also sealing of dust becomes effectual.Type: GrantFiled: April 26, 1989Date of Patent: September 24, 1991Assignee: Nippon Seiko Kabushiki KaishaInventor: Masachi Hosoya
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Patent number: 4973064Abstract: A magnetic fluid seal device, which comprises a seal member constituting of two ring-shaped pole pieces attached to the poles of a permanent magnet, a rotor disposed with a gap for the seal member in between, and magnetic fluid magnetically kept in the aforementioned gap. The magnetic fluid is magnetically maintained through a groove defined by the inside faces of the two ring pole pieces and the peripheral surface of the ring magnet, and the distance of the groove on one side of the two ring pole pieces keeping the magnetic fluiid is made smaller than the thickness of the ring magnet at a place on its other side not keeping the magnetic fluid, thus ensuring the magnetic fluid to be injected into the two gaps and the device to be effectually sealed by the two-stage closely adjacent fluid seals formed.Type: GrantFiled: April 26, 1989Date of Patent: November 27, 1990Assignee: Nippon Seiko Kabushiki KaishaInventor: Masachi Hosoya
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Patent number: 4841408Abstract: An electroconductive sliding apparatus for electrically connecting a first member to a second member, both of which members are relatively moving and electroconductive by means of an electroconductive contactor, said apparatus comprising: a magnetic fluid, which is retained by means of the magnetic force between said first and/or second members, placed at the slidable contact point of said first and/or second members with said contactor; said first and/or second members and said contactor being brought into close proximity capable of metal contact or electroconduction by means of the force applied to said contactor and at said slidable contact point at which said magnetic fluid is placed.Type: GrantFiled: October 21, 1987Date of Patent: June 20, 1989Assignee: Nippon Seiko Kabushiki KaishaInventors: Shigeki Matsunaga, Yuichi Ishikawa, Masachi Hosoya