Patents by Inventor Yuichi Asano
Yuichi Asano 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: 10962063Abstract: A fixed type constant velocity universal joint includes an outer joint member having a cup shape, an inner joint member, which is received in the outer joint member, and transmits torque between the outer and inner joint members through intermediation of balls while allowing angular displacement, and a shaft, which is coupled to the inner joint member so as to allow torque transmission. A recessed portion is formed in a bottom portion of the outer joint member, and an embedded stopper that enters the recessed portion of the outer joint member is mounted to a shaft end portion of the shaft opposed to the recessed portion. The embedded stopper is allowed to interfere with the recessed portion of the outer joint member at an angle that is smaller than an incorporating angle of the balls and larger than a maximum operating angle during use of the joint.Type: GrantFiled: October 4, 2016Date of Patent: March 30, 2021Assignee: NTN CORPORATIONInventors: Yuichi Asano, Tomoshige Kobayashi
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Patent number: 10875357Abstract: A fixed type constant velocity universal joint includes an outer joint member having a cup shape, an inner joint member, which is received in the outer joint member, and transmits torque between the inner and outer joint members through intermediation of balls while allowing angular displacement, and a hollow shaft, which is coupled to the inner joint member so as to allow torque transmission. A threaded hole is formed in a bottom portion of the outer joint member along an axial direction. A recessed hole is formed to be open in a shaft end portion of the hollow shaft opposed to the threaded hole. An embedded stopper that enters the threaded hole is press-fitted into the recessed hole. The embedded stopper is retractable into the hollow shaft in a press-fitting direction.Type: GrantFiled: October 4, 2016Date of Patent: December 29, 2020Assignee: NTN CORPORATIONInventors: Tomoshige Kobayashi, Yuichi Asano
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Patent number: 10443647Abstract: A corrugated portion is formed in one end edge portion of the metallic shaft main body (2), and a triangular corrugated portion (11) is formed in an end edge portion of the shaft auxiliary body (3) on the metallic shaft main body side. The metallic shaft main body (2) and the shaft auxiliary body (3) are integrated by being linearly arranged by way of meshing that brings a side of the triangular corrugated portion (9) on the main body side and a side of the triangular corrugated portion (11) on the auxiliary body side into contact with each other. A fiber orientation angle (?) of the fiber reinforced plastic of the shaft auxiliary body (3) is set so as to be in the same direction as a direction of stress generated in a hypotenuse of each triangular portion under a torque load state.Type: GrantFiled: November 2, 2015Date of Patent: October 15, 2019Assignee: NTN CORPORATIONInventors: Taku Itagaki, Yuichi Asano, Tomoshige Kobayashi, Takeyoshi Konomoto, Minoru Ishijima
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Patent number: 10352365Abstract: A power transmission shaft including a male spline formed in an outer periphery thereof, and a diameter increasing portion formed on a part of a tooth bottom of the male spline, which is located on an opposite side to an axial end of the power transmission shaft. The tooth bottom of the male spline has a substantially constant circumferential width extending up to an axial region of the diameter increasing portion. The diameter increasing portion includes a chamfered portion formed in the axial region of the diameter increasing portion, the chamfered portion connecting the tooth bottom and a tooth flank of the male spline to each other to reduce a tooth groove width.Type: GrantFiled: March 12, 2014Date of Patent: July 16, 2019Assignee: NTN CORPORATIONInventors: Tsuneaki Hiraoka, Yuichi Asano, Yuichiro Kitamura, Kiyohiro Suzuki
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Publication number: 20180313406Abstract: A fixed type constant velocity universal joint includes an outer joint member having a cup shape, an inner joint member, which is received in the outer joint member, and transmits torque between the outer and inner joint members through intermediation of balls while allowing angular displacement, and a shaft, which is coupled to the inner joint member so as to allow torque transmission. A recessed portion is formed in a bottom portion of the outer joint member, and an embedded stopper that enters the recessed portion of the outer joint member is mounted to a shaft end portion of the shaft opposed to the recessed portion. The embedded stopper is allowed to interfere with the recessed portion of the outer joint member at an angle that is smaller than an incorporating angle of the balls and larger than a maximum operating angle during use of the joint.Type: ApplicationFiled: October 4, 2016Publication date: November 1, 2018Inventors: Yuichi ASANO, Tomoshige KOBAYASHI
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Publication number: 20180304678Abstract: A fixed type constant velocity universal joint includes an outer joint member having a cup shape, an inner joint member, which is received in the outer joint member, and transmits torque between the inner and outer joint members through intermediation of balls while allowing angular displacement, and a hollow shaft, which is coupled to the inner joint member so as to allow torque transmission. A threaded hole is formed in a bottom portion of the outer joint member along an axial direction. A recessed hole is formed to be open in a shaft end portion of the hollow shaft opposed to the threaded hole. An embedded stopper that enters the threaded hole is press-fitted into the recessed hole. The embedded stopper is retractable into the hollow shaft in a press-fitting direction.Type: ApplicationFiled: October 4, 2016Publication date: October 25, 2018Inventors: Tomoshige KOBAYASHI, Yuichi ASANO
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Patent number: 10086648Abstract: A bearing device for a wheel has a stem shaft of an outer joint member of a constant-velocity universal joint fit and inserted in a hole of a hub wheel, the stem shaft and hub wheel being coupled through an intermediation of a recess-projection fitting structure. Projections extending in an axial direction are provided on one of the stem shaft and an inner diameter surface of the hole of the hub wheel. The projections are press-fit into another of the stem shaft and the inner diameter surface of the hole along the axial direction. Recesses that adhere to and fit the projections are formed in the other. An end on an inboard side of the hub wheel is caulked to an outer diameter side to form a caulking section and preload is applied to a roller bearing by the caulking section.Type: GrantFiled: January 6, 2016Date of Patent: October 2, 2018Assignee: NTN CORPORATIONInventors: Tohru Nakagawa, Yuichi Asano, Masahiro Ozawa
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Publication number: 20180149207Abstract: Provided is a fixed type constant velocity universal joint, including: an outer joint member (10) having a cup-shape; and an inner joint member (20), which is received in the outer joint member (10), and is configured to transmit torque between the inner joint member (20) and the outer joint member (10) through intermediation of balls (30) while allowing angular displacement. The fixed type constant velocity universal joint has a shaft (50) extending from the inner joint member (20). The shaft (50) includes a large-diameter portion (51), which is formed integrally with the shaft (50), and interferes with the balls (30) when the shaft (50) forms an operating angle, which is larger than a maximum operating angle, with respect to the outer joint member (10).Type: ApplicationFiled: June 9, 2016Publication date: May 31, 2018Inventor: Yuichi ASANO
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Publication number: 20180106296Abstract: A fixed type constant velocity universal joint includes an outer joint member including a cup section and a hollow shaft section, an inner joint member having a radially inner hole to allow one end of a shaft to be coupled thereto, and torque transmitting balls arranged in ball tracks formed of pairs of track grooves of the outer and inner joint members. The universal joint also includes a cage interposed between a radially inner surface of the outer joint member and a radially outer surface of the inner joint member and configured to retain the torque transmitting balls, and a stopper that regulates a maximum operating angle. The stopper is inserted into the hollow shaft section until the universal joint is mounted to a joint mounting device after the torque transmitting balls are incorporated and then the shaft is mounted to the universal joint.Type: ApplicationFiled: February 25, 2016Publication date: April 19, 2018Inventors: Tomoshige KOBAYASHI, Yuichi ASANO
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Publication number: 20170335883Abstract: A corrugated portion is formed in one end edge portion of the metallic shaft main body (2), and a triangular corrugated portion (11) is formed in an end edge portion of the shaft auxiliary body (3) on the metallic shaft main body side. The metallic shaft main body (2) and the shaft auxiliary body (3) are integrated by being linearly arranged by way of meshing that brings a side of the triangular corrugated portion (9) on the main body side and a side of the triangular corrugated portion (11) on the auxiliary body side into contact with each other. A fiber orientation angle (?) of the fiber reinforced plastic of the shaft auxiliary body (3) is set so as to be in the same direction as a direction of stress generated in a hypotenuse of each triangular portion under a torque load state.Type: ApplicationFiled: November 2, 2015Publication date: November 23, 2017Inventors: Taku ITAGAKI, Yuichi ASANO, Tomoshige KOBAYASHI, Takeyoshi KONOMOTO, Minoru ISHIJIMA
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Patent number: 9573418Abstract: A bearing device for a wheel has a hub wheel and a constant velocity universal joint with an outer joint member. Projecting portions extending in an axial direction are provided on one of an outer surface of a shaft section of the outer joint member and an inner surface of a hole portion of the hub wheel. The projecting portions are press-fitted into the other along the axial direction, and recessed portions are formed in the other through press-fitting of the projecting portions. Thus, a recess-projection fitting structure is formed, in which the projecting portions and the recessed portions are held in close contact with each other through an entire region of fitting contact regions therebetween.Type: GrantFiled: August 21, 2013Date of Patent: February 21, 2017Assignee: NTN CORPORATIONInventors: Masahiro Ozawa, Yuichi Asano, Masayuki Kuroda, Tohru Nakagawa, Kiyoshige Yamauchi, Mitsuru Umekida
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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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Publication number: 20160298693Abstract: A power transmission shaft including a male spline formed in an outer periphery thereof, and a diameter increasing portion formed on a part of a tooth bottom of the male spline, which is located on an opposite side to an axial end of the power transmission shaft. The tooth bottom of the male spline has a substantially constant circumferential width extending up to an axial region of the diameter increasing portion. The diameter increasing portion includes a chamfered portion formed in the axial region of the diameter increasing portion, the chamfered portion connecting the tooth bottom and a tooth flank of the male spline to each other to reduce a tooth groove width.Type: ApplicationFiled: March 12, 2014Publication date: October 13, 2016Applicant: NTN CORPORATIONInventors: Tsuneaki HIRAOKA, Yuichi ASANO, Yuichiro KITAMURA, Kiyohiro SUZUKI
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Publication number: 20160136995Abstract: A bearing device for a wheel has a stem shaft of an outer joint member of a constant-velocity universal joint fit and inserted in a hole of a hub wheel, the stem shaft and hub wheel being coupled through an intermediation of a recess-projection fitting structure. Projections extending in an axial direction are provided on one of the stem shaft and an inner diameter surface of the hole of the hub wheel. The projections are press-fit into another of the stem shaft and the inner diameter surface of the hole along the axial direction. Recesses that adhere to and fit the projections are formed in the other. An end on an inboard side of the hub wheel is caulked to an outer diameter side to form a caulking section and preload is applied to a roller bearing by the caulking section.Type: ApplicationFiled: January 6, 2016Publication date: May 19, 2016Applicant: NTN CORPORATIONInventors: Tohru NAKAGAWA, Yuichi ASANO, Masahiro OZAWA
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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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Patent number: 9308777Abstract: A bearing device for a wheel is capable of suppressing radial play and allowing firm and easy connection between a hub and an outer ring of a constant velocity universal joint. Axially extending projections are provided on a shaft portion of a joint outer ring, and the shaft portion is press-fitted into a hole of a hub. Through this press-fitting, recesses held in close fit-engagement with the projections are formed by the projections in an inner diameter surface of the hub, forming a recess/projection fit-engagement structure in which the projections and the recesses are held in close contact with each other over an entire fit-engagement region thereof. A press-fitting margin (?d) of the projections with respect to the hub and a height (h) of the projections are set to the following range: 0.3<?d/2 h<0.86.Type: GrantFiled: June 27, 2014Date of Patent: April 12, 2016Assignee: NTN CORPORATIONInventors: Tohru Nakagawa, Yuichi Asano, Masahiro Ozawa, Masayuki Kuroda
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Patent number: 9261145Abstract: A bearing device for a wheel has a stem shaft of an outer joint member of a constant-velocity universal joint fit and inserted in a hole of a hub wheel, the stem shaft and hub wheel being coupled through an intermediation of a recess-projection fitting structure. Projections extending in an axial direction are provided on one of the stem shaft and an inner diameter surface of the hole of the hub wheel. The projections are press-fit into another of the stem shaft and the inner diameter surface of the hole along the axial direction. Recesses that adhere to and fit the projections are formed in the other. An end on an inboard side of the hub wheel is caulked to an outer diameter side to form a caulking section and preload is applied to a roller bearing by the caulking section.Type: GrantFiled: March 17, 2009Date of Patent: February 16, 2016Assignee: NTN CORPORATIONInventors: Tohru Nakagawa, Yuichi Asano, Masahiro Ozawa
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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: 8998731Abstract: A shaft portion of a joint outer ring where projections extending in an axial direction are provided is press-fitted into a hole portion of a hub wheel to thereby form recesses by the projections in an inner diameter surface of a shaft fitting hole of the hub wheel, by which a recess-projection fitting structure is constructed. An entire area of fitting sites of the projections and the recesses are brought into close contact. Moreover, a bolt member is fastened in a bolt hole provided in the shaft portion of the joint outer ring after the construction of the recess-projection fitting structure, which restricts separation between the hub wheel and the joint outer ring. As the bolt member, if an outer diameter of a seating surface thereof is d1 and a shaft diameter is d2, a bolt member satisfying a relational expression of 2.3?(d1/d2)2?4.9 is used.Type: GrantFiled: August 18, 2011Date of Patent: April 7, 2015Assignee: NTN CorporationInventors: Mitsuru Umekida, Masahiro Ozawa, Yuichi Asano