Patents by Inventor Hisaaki Kura
Hisaaki Kura 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: 9511629Abstract: A bearing device includes a recess-projection fitting structure in which a hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: GrantFiled: May 5, 2014Date of Patent: December 6, 2016Assignee: NTN CORPORATIONInventors: Akira Torii, Hiroshi Kawamura, Kiyoshige Yamauchi, Masahiro Ozawa, Tohru Nakagawa, Yuichi Asano, Mitsuru Umekida, Hisaaki Kura, Shin Tomogami
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Patent number: 9321309Abstract: A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: GrantFiled: March 23, 2015Date of Patent: April 26, 2016Assignee: NTN CORPORATIONInventors: Akira Torii, Hiroshi Kawamura, Kiyoshige Yamauchi, Masahiro Ozawa, Tohru Nakagawa, Yuichi Asano, Mitsuru Umekida, Hisaaki Kura, Shin Tomogami
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Publication number: 20150197121Abstract: A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: ApplicationFiled: March 23, 2015Publication date: July 16, 2015Applicant: NTN CORPORATIONInventors: Akira TORII, Hiroshi KAWAMURA, Kiyoshige YAMAUCHI, Masahiro OZAWA, Tohru NAKAGAWA, Yuichi ASANO, Mitsuru UMEKIDA, Hisaaki KURA, Shin TOMOGAMI
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Patent number: 9039286Abstract: A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: GrantFiled: May 5, 2014Date of Patent: May 26, 2015Assignee: NTN CorporationInventors: Akira Torii, Hiroshi Kawamura, Kiyoshige Yamauchi, Masahiro Ozawa, Tohru Nakagawa, Yuichi Asano, Mitsuru Umekida, Hisaaki Kura, Shin Tomogami
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Patent number: 8944694Abstract: A bearing device for a driving wheel includes an outer race having an inner periphery in which double-row outer raceway surfaces are formed; a hub wheel and an inner race having outer peripheries in which double-row inner raceway surfaces opposed to the outer raceway surfaces are formed; and double-row rolling elements interposed between the outer raceway surfaces and the inner raceway surfaces. A shaft hole of the hub wheel is formed into a cylindrical shape, and a male spline is formed on an outer periphery of a stem section of the outer joint member so that the stem section of the outer joint member is press-fit into the shaft hole of the hub wheel. With this, recesses caused to fit on the male spline with interference are formed in the shaft hole of the hub wheel, whereby the hub wheel and the outer joint member are separably coupled to each other.Type: GrantFiled: March 7, 2008Date of Patent: February 3, 2015Assignee: NTN CorporationInventors: Yoshikazu Fukumura, Masayuki Kuroda, Hisaaki Kura, Shin Tomogami, Hiroshi Kawamura, Shigeaki Fukushima, Masahiro Ozawa, Yuichi Asano
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Publication number: 20140239706Abstract: A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: ApplicationFiled: May 5, 2014Publication date: August 28, 2014Applicant: NTN CorporationInventors: Akira TORII, Hiroshi KAWAMURA, Kiyoshige YAMAUCHI, Masahiro OZAWA, Tohru NAKAGAWA, Yuichi ASANO, Mitsuru UMEKIDA, Hisaaki KURA, Shin TOMOGAMI
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Publication number: 20140239707Abstract: A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: ApplicationFiled: May 5, 2014Publication date: August 28, 2014Applicant: NTN CorporationInventors: Akira TORII, Hiroshi KAWAMURA, Kiyoshige YAMAUCHI, Masahiro OZAWA, Tohru NAKAGAWA, Yuichi ASANO, Mitsuru UMEKIDA, Hisaaki KURA, Shin TOMOGAMI
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Patent number: 8757887Abstract: A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.Type: GrantFiled: March 13, 2008Date of Patent: June 24, 2014Assignee: NTN CorporationInventors: Akira Torii, Hiroshi Kawamura, Kiyoshige Yamauchi, Masahiro Ozawa, Tohru Nakagawa, Yuichi Asano, Mitsuru Umekida, Hisaaki Kura, Shin Tomogami
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Patent number: 8708570Abstract: A hub wheel (21) and an outer joint member (3) are coupled to each other through intermediation of a recess-projection fitting structure (M). The recess-projection fitting structure (M) can be separated by being applied with a pulling-out force in an axial direction under a state in which a bolt member (30) is removed, and can be re-formed by re-screwing the bolt member (30) into a bolt hole (5d). The hub wheel (21) comprises a receiving portion (23a) for receiving the bolt member (30). The shaft portion (5) has a small diameter portion (5a) serving as a fit-in portion to be fitted along an inner periphery of the receiving portion (23a) under a state in which the recess-projection fitting structure (M) is formed. The small diameter portion (5a) is used as a part for confirming the accuracy and the state of the recess-projection fitting structure (M).Type: GrantFiled: November 29, 2010Date of Patent: April 29, 2014Assignee: NTN CorporationInventors: Mitsuru Umekida, Shin Tomogami, Kiyotake Shibata, Yuichi Asano, Hisaaki Kura
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Patent number: 8480306Abstract: A bearing unit for driving wheels, and a manufacturing method thereof, includes a hub, a bearing, and a constant velocity universal joint, such that a process for assembling the bearing unit to a knuckle member is simplified. In order to achieve this, a hub (10) and an outer joint member (31) of an out-board side constant velocity universal joint (30) are plastically joined together. An outer peripheral surface (26a) of an outer member (26) is press-fitted into an inner peripheral surface of the knuckle member, and a maximum diameter dimension (D1) of the out-board side constant velocity universal joint (30) is set smaller than a minimum diameter dimension (Dn) of the knuckle member (6). Also, a maximum diameter dimension (D2) of an in-board side constant velocity universal joint (40) is set smaller than the minimum diameter dimension (Dn) of the knuckle member (6).Type: GrantFiled: March 14, 2007Date of Patent: July 9, 2013Assignee: NTN CorporationInventors: Yoshikazu Fukumura, Masayuki Kuroda, Hisaaki Kura, Shin Tomogami, Hiroshi Kawamura, Shigeaki Fukushima
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Patent number: 8382378Abstract: A wheel bearing device suppresses backlash in the circumferential direction and has excellent workability in connecting a hub wheel and an outer joint component of a constant velocity universal joint. The wheel bearing device has a stem shaft of an outer joint component of a constant velocity universal joint fitted into a hole section of a hub wheel that is integrated with the hub wheel by a projection and recess mating structure. In the projection and recess mating structure, an overall recess mating area of a projection is in close contact with a corresponding recess.Type: GrantFiled: December 4, 2007Date of Patent: February 26, 2013Assignee: NTN CorporationInventors: Yoshikazu Fukumura, Hisaaki Kura, Shin Tomogami, Hiroshi Kawamura, Kiyoshige Yamauchi, Masahiro Ozawa, Tohru Nakagawa, Yuichi Asano
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Patent number: 8348772Abstract: A plunging type constant velocity universal joint includes an inner joint member having an outer peripheral surface in which a plurality of linear track grooves are formed in an axial direction and inclined with respect to an axial line, an outer joint member having an inner peripheral surface in which a plurality of linear track grooves are formed in the axial direction and inclined with respect to the axial line in a direction opposite to that of the track grooves of the inner joint member, and having an inside filled with a lubricant, balls incorporated in respective crossing portions between the track grooves of the inner and outer joint members, and a cage arranged between the outer peripheral surface and the inner peripheral surface for retaining the balls in the same plane, in which a large number of minute recesses are formed at random in surfaces of the balls.Type: GrantFiled: March 11, 2008Date of Patent: January 8, 2013Assignee: NTN CorporationInventors: Naohiro Une, Tatsuro Sugiyama, Shin Tomogami, Hisaaki Kura
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Patent number: 8342971Abstract: A fixed type constant velocity universal joint secures smooth rotation and reduces a load on a cage even at a large operating angle and when bearing large torque. The universal joint includes an outer joint member having an inner spherical surface in which track grooves are circumferentially formed in an axial direction and an inner joint member having an outer spherical surface in which track grooves paired with the track grooves of the outer joint member are circumferentially formed in the axial direction and multiple outer spherical surface portions circumferentially arranged. Balls are interposed between the track grooves of the outer and inner joint members for transmitting torque. A cage is interposed between the inner spherical surface and the outer spherical surface for retaining the balls. A spherical surface angle of the outer spherical surface on a joint opening side is set to 12.5° or more.Type: GrantFiled: January 7, 2008Date of Patent: January 1, 2013Assignee: NTN CorporationInventors: Masazumi Kobayashi, Kisao Yamazaki, Hisaaki Kura, Shin Tomogami
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Publication number: 20120281941Abstract: A hub wheel (21) and an outer joint member (3) are coupled to each other through intermediation of a recess-projection fitting structure (M). The recess-projection fitting structure (M) can be separated by being applied with a pulling-out force in an axial direction under a state in which a bolt member (30) is removed, and can be re-formed by re-screwing the bolt member (30) into a bolt hole (5d). The hub wheel (21) comprises a receiving portion (23a) for receiving the bolt member (30). The shaft portion (5) has a small diameter portion (5a) serving as a fit-in portion to be fitted along an inner periphery of the receiving portion (23a) under a state in which the recess-projection fitting structure (M) is formed. The small diameter portion (5a) is used as a part for confirming the accuracy and the state of the recess-projection fitting structure (M).Type: ApplicationFiled: November 29, 2010Publication date: November 8, 2012Inventors: Mitsuru Umekida, Shin Tomogami, Kiyotake Shibata, Yuichi Asano, Hisaaki Kura
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Patent number: 8172689Abstract: A fixed-type constant velocity universal joint can sufficiently interpose a lubricant between a torque transmitting ball and a guide groove, and reduce frictional force. The fixed-type constant velocity universal joint of the present invention includes an outer joint member 1 that is filled with a lubricant and on which a guide groove 1b that extends in an axial direction is formed on a spherical inner circumferential surface 1a, an inner joint member 2 provided on an inner diameter side of the outer joint member 1 and on which a guide groove 2b that extends in the axial direction is formed on a spherical outer circumferential surface 2a, a torque transmitting ball 3 interposed between opposing guide grooves 1b and 2b of the outer joint member 1 and the inner joint member 2 such as to roll freely, and a cage 4 that holds each ball 3. Numerous miniscule recesses are randomly formed on a surface of the ball 3.Type: GrantFiled: January 7, 2008Date of Patent: May 8, 2012Assignee: NTN CorporationInventors: Tomoshige Kobayashi, Teruaki Fujio, Hisaaki Kura, Shin Tomogami, Takeshi Kohara
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Patent number: 8162766Abstract: A fixed type constant velocity universal joint includes an outer joint member having an inner spherical surface in which a plurality of track grooves extending in an axial direction are formed; an inner joint member having an outer spherical surface in which a plurality of track grooves extending in the axial direction while paired with the track grooves of the outer joint member are formed. A plurality of balls are interposed between the track grooves of each of the outer joint member and the inner joint member, for transmitting a torque, and a cage is interposed between the inner spherical surface of the outer joint member and the outer spherical surface of the inner joint member, for holding the balls.Type: GrantFiled: January 30, 2008Date of Patent: April 24, 2012Assignee: NTN CorporationInventors: Hisaaki Kura, Shin Tomogami, Tomoshige Kobayashi, Teruaki Fujio, Takeshi Kohara, Tomoaki Kaneko
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Patent number: 8132968Abstract: A cylindrical pilot portion (72) to be fitted to an inner periphery of a wheel (80) is formed at an inner diameter part of a brake rotor (70). A shape of a hub wheel, in particular, the shape on an outboard side is thus simplified, and the hub wheel can be formed at low cost through cold forging or the like.Type: GrantFiled: May 15, 2007Date of Patent: March 13, 2012Assignee: NTN CorporationInventors: Yoshikazu Fukumura, Masayuki Kuroda, Hisaaki Kura, Shin Tomogami, Hiroshi Kawamura, Shigeaki Fukushima
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Patent number: 8128504Abstract: An inner joint component and a shaft of a constant velocity universal joint are connected in a configuration it difficult for backlash to occur. An axis hole inner diameter of an inner member of the constant velocity universal joint is unhardened, and a spline serving as a recess and projection section running along a circumferential direction is formed on an axial end outer diameter of the shaft. A hardened layer n is formed on the axial end outer diameter of the shaft. The shaft and the inner member are joined by an axial end of the shaft being pressed into the axis hole inner diameter of the inner member to incuse a shape of said recess and projection section onto the axis hole inner diameter of the inner member 20.Type: GrantFiled: April 12, 2007Date of Patent: March 6, 2012Assignee: NTN CorporationInventors: Yoshikazu Fukumura, Hisaaki Kura, Shin Tomogami, Tohru Nakagawa, Yuichi Asano
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Publication number: 20110212789Abstract: Wedge angles are formed between mutually facing central track-groove portions (11b, 12b, 21b, 22b) of an outer joint member (1) and an inner joint member (2). Track grooves (11, 12) provided to the outer joint member (1) and track grooves (21, 22) provided to the inner joint member (2) include a first pair of track grooves (11, 21) respectively including the central track-groove portions (11b, 21b) forming therebetween the wedge angle (?) opening to an opening side of the outer joint member (1) under a state in which an operating angle is 0°, and a second pair of track grooves (12, 22) respectively including the central track-groove portions (12b, 22b) oppositely forming therebetween the wedge angle (?) opening to an inner-end side of the outer joint member (1) under the state in which the operating angle is 0° .Type: ApplicationFiled: November 27, 2009Publication date: September 1, 2011Inventors: Hirokazu Ooba, Masayuki Kuroda, Hisaaki Kura, Tatsuro Sugiyama, Teruaki Fujio
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Publication number: 20100215302Abstract: Provided is a bearing device for a wheel that can realize prevention of a backlash in a circumferential direction and is excellent in workability of connection of a hub wheel and an outer joint member of a constant velocity universal joint. Further, provided is a bearing device for a wheel that can prevent deterioration in NVH characteristics, which is caused by the backlash occurring in a joint section between the hub wheel and the constant velocity universal joint or between an outer member and a knuckle, and can perform rotation torque transmission with high accuracy. The bearing device includes a recess-projection fitting structure (M) in which the hub wheel (1) and a shaft section (12), which is fitted in a hole (22) of the hub wheel (1) of the outer joint member of the constant velocity universal joint (3) are unitized together.Type: ApplicationFiled: March 13, 2008Publication date: August 26, 2010Inventors: Akira Torii, Hiroshi Kawamura, Kiyoshige Yamauchi, Masahiro Ozawa, Tohru Nakagawa, Yuichi Asano, Mitsuru Umekida, Hisaaki Kura, Shin Tomogami