Patents by Inventor Eiichiro Shimazu
Eiichiro Shimazu 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: 9284982Abstract: A cage is made of a magnesium alloy such as AZ91D, and is molded by means of injection molding. In this cage, a confluence region is brought away to outside the cage during the injection molding. The confluence region is a region including a void formed by merging of flows of the magnesium alloy. When observing a cross sectional surface of the cage, a ratio of an ? phase having a grain size of 20 ?m or greater is less than 15% in the magnesium alloy constituting the cage.Type: GrantFiled: March 9, 2011Date of Patent: March 15, 2016Assignee: NTN CorporationInventors: Mitsuo Kawamura, Eiichiro Shimazu, Yasutake Hayakawa, Takahiro Okuno, Junichi Ooshimo, Ryuichi Sakamoto
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Publication number: 20130004112Abstract: A cage is made of a magnesium alloy such as AZ91D, and is molded by means of injection molding. In this cage, a confluence region is brought away to outside the cage during the injection molding. The confluence region is a region including a void formed by merging of flows of the magnesium alloy. When observing a cross sectional surface of the cage, a ratio of an ? phase having a grain size of 20 ?m or greater is less than 15% in the magnesium alloy constituting the cage.Type: ApplicationFiled: March 9, 2011Publication date: January 3, 2013Inventors: Mitsuo Kawamura, Eiichiro Shimazu, Yasutake Hayakawa, Takahiro Okuno, Junichi Ooshimo, Ryuichi Sakamoto
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Publication number: 20120175984Abstract: Disclosed is a dynamic bearing device which allows production of a smaller housing at low cost and which suppresses ion elution from the resin portion to thereby maintain cleanliness in the dynamic bearing device and exert a desired bearing performance. A dynamic bearing device 1 is equipped with a bearing sleeve 8 fixed to the inner periphery of the housing 7, and a rotary member rotatable relative to the bearing sleeve 8 and the housing 7, in which the rotary member is supported in the radial direction and the thrust direction in a non-contact manner by a dynamic pressure action of a lubricant fluid generated in a bearing clearance. The housing 7 is formed by injection molding of a resin composition containing polyphenylene sulfide (PPS) as the base resin and PAN type carbon fibers as a filler.Type: ApplicationFiled: March 20, 2012Publication date: July 12, 2012Applicant: NTN CORPORATIONInventors: Kazutoyo Murakami, Masaki Egami, Eiichiro Shimazu, Kenji Ito, Fuminori Satoji
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Publication number: 20080309183Abstract: Disclosed is a dynamic bearing device which allows production of a smaller housing at low cost and which suppresses ion elution from the resin portion to thereby maintain cleanliness in the dynamic bearing device and exert a desired bearing performance. A dynamic bearing device 1 is equipped with a bearing sleeve 8 fixed to the inner periphery of the housing 7, and a rotary member rotatable relative to the bearing sleeve 8 and the housing 7, in which the rotary member is supported in the radial direction and the thrust direction in a non-contact manner by a dynamic pressure action of a lubricant fluid generated in a bearing clearance. The housing 7 is formed by injection molding of a resin composition containing polyphenylene sulfide (PPS) as the base resin and PAN type carbon fibers as a filler.Type: ApplicationFiled: August 1, 2005Publication date: December 18, 2008Applicant: NTN CORPORATIONInventors: Kazutoyo Murakami, Masaki Egami, Eiichiro Shimazu, Kenji Ito, Fuminori Satoji
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Publication number: 20060045395Abstract: Disclosed is a shaft member for a hydrodynamic bearing device which allows production of a shaft member of smaller size at low cost and which suppresses ion elution from the resin portion, thereby maintaining cleanliness in the hydrodynamic bearing device and making it possible to exert a desired bearing performance. A shaft member 2 is equipped with a shaft portion 2a and a flange portion 2b protruding radially outwards from the shaft portion 2a, and has a composite structure composed of a metal material and a resin composition, in which a resin portion 21 is formed by injection molding of a resin composition containing as a base resin a polyphenylene sulfide (PPS) whose Na content is not more than 2,000 ppm and containing PAN type carbon fibers as a filler.Type: ApplicationFiled: August 31, 2005Publication date: March 2, 2006Inventors: Eiichiro Shimazu, Masaki Egami
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Patent number: 6517250Abstract: An environment-friendly rolling bearing is proposed in which at least one of inner ring, outer ring, rolling elements, seals and retainer is formed of a biodegradable material.Type: GrantFiled: October 27, 2000Date of Patent: February 11, 2003Assignee: NTN CorporationInventors: Koya Ohira, Hidenobu Mikaki, Mari Kataoka, Takuya Ishii, Kenji Ito, Eiichiro Shimazu, Takayuki Kawamura
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Patent number: 6476116Abstract: Resin composition and precision sliding parts are proposed. The resin composition includes a modified polyphenylene ether resin as a main component, a fibrous reinforcing agent, and a solid lubricant comprising tetrafluoroethyelene and graphite in the amount of 2-30 volume %. The modified polyphenylene ether resin is prepared by blending a polystyrene-family resin with a polyphenylele ether resin. The ratio of the tetrafluoroethylene resin and the graphite is 1:1 to 1:5. The fibrous reinforcing agent is glass fiber or carbon fiber. The fibrous reinforcing material is orientated such that the angle of fiber axis is not more than 30 degrees with respect to the sliding surface. The fibrous reinforcing material is a fibrous reinforcing material having a fiber diameter of 10 &mgr;m or less.Type: GrantFiled: September 22, 2000Date of Patent: November 5, 2002Assignee: NTN CorporationInventors: Masaki Egami, Takuya Ishii, Eiichiro Shimazu
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Patent number: 6232385Abstract: A machine part is proposed which is made from TPI resin and is high in wear resistance and durability. The machine part is formed from a composition comprising 100 parts by weight of a thermoplastic polyimide resin, and 10-100 parts by weight of a reinforcing material, the thermoplastic polyimide resin having a crystallinity of 10% or over. The machine part may be a gear, a friction wheel or a cam used in a mechanical transmission. The crystallinity of the resin is adjusted to 10% or over by injection-molding the resin composition, and heating the thus injection-molded article at 220-340° C. for 5-24 hours.Type: GrantFiled: March 30, 2000Date of Patent: May 15, 2001Assignee: NTN CorporationInventors: Eiichiro Shimazu, Mari Kataoka, Masaki Egami
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Patent number: 5882012Abstract: An oil-submerged sliding member which has a good sealability and wear resistance and low attack to the mating member and which can be used with either a soft or a non-soft mating member. It is made from a resin composition comprising 30-88% by weight of a crosslinked polyallylene sulfide resin having a melt viscosity of 2000-5000 poise at 300.degree. C., 10-45% by weight of a carbon fiber, and 2-25% by weight of recycled polytetrafluoroethylene resin powder, and if required, not more than 10% by weight of molybdenum disulfide. Also, oil seal rings comprising the oil-submerged sliding member.Type: GrantFiled: November 27, 1996Date of Patent: March 16, 1999Assignee: NTN CorporationInventors: Hiroshi Niwa, Kazunori Kubota, Eiichiro Shimazu