Patents by Inventor Shigeyoshi Ishiguro
Shigeyoshi Ishiguro 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: 7052400Abstract: An annular support ring 32 is fitted onto the outer periphery of each trunnion 22. This support ring 32 and the roller 34 are unitized via a plurality of needle rollers 36 to constitute a roller assembly capable of relative rotations therebetween. In longitudinal section, each trunnion 22 has an outer periphery of straight shape, parallel to the axis of the trunnion 22. In cross section, the trunnion 22 has a generally ellipse shape with the major axis orthogonal to the axis of the joint. The inner periphery of each support ring 32 is arcuate and convex in section. This combines with the general elliptic cross sections of the trunnions 22 and the provision of predetermined clearances between the trunnions 22 and the support rings 32, to allow the support rings 32 to move along the axial directions of the trunnions 22 as well as make tilting movements with respect to the trunnions 22.Type: GrantFiled: January 28, 2004Date of Patent: May 30, 2006Assignee: NTN CorporationInventors: Hisaaki Kura, Kenji Terada, Tatsuhiro Goto, Akio Sakaguchi, Shigeyoshi Ishiguro, Kazuhiko Yoshida, Tatsuro Sugiyama
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Patent number: 6893351Abstract: A tripod type constant velocity universal joint of a single roller type is provided, which can be used in a vehicle operating at high angles without causing an increase in costs by lowering the level of vibration even at a high operating angle. A tripod type constant velocity universal joint is composed of an outer joint member with three track grooves, extending in its axial direction, on the inner circumferential surface of the outer joint member, a tripod member with three radially projecting leg shafts around the circumference of the tripod member, and rotatable rollers mounted on each leg shaft through a plurality of needle rollers and positioned in the track grooves of the outer joint member, the outer circumferential surfaces of the rollers being guided by roller guide surfaces provided on both sides of the track grooves. In this construction, grooves extending along the track grooves are provided on the roller guide surfaces where the rollers contact.Type: GrantFiled: July 19, 2001Date of Patent: May 17, 2005Assignee: NTN CorporationInventors: Shigeyoshi Ishiguro, Tatsuro Sugiyama, Haruo Nagatani
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Publication number: 20040209693Abstract: An annular support ring 32 is fitted onto the outer periphery of each trunnion 22. This support ring 32 and the roller 34 are unitized via a plurality of needle rollers 36 to constitute a roller assembly capable of relative rotations therebetween. In longitudinal section, each trunnion 22 has an outer periphery of straight shape, parallel to the axis of the trunnion 22. In cross section, the trunnion 22 has a generally ellipse shape with the major axis orthogonal to the axis of the joint. The inner periphery of each support ring 32 is arcuate and convex in section. This combines with the general elliptic cross sections of the trunnions 22 and the provision of predetermined clearances between the trunnions 22 and the support rings 32, to allow the support rings 32 to move along the axial directions of the trunnions 22 as well as make tilting movements with respect to the trunnions 22.Type: ApplicationFiled: January 28, 2004Publication date: October 21, 2004Applicant: NTN CORPORATIONInventors: Hisaaki Kura, Kenji Terada, Tatsuhiro Goto, Akio Sakaguchi, Shigeyoshi Ishiguro, Kazuhiko Yoshida, Tatsuro Sugiyama
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Patent number: 6719635Abstract: An annular support ring 32 is fitted onto the outer periphery of each trunnion 22. This support ring 32 and the roller 34 are unitized via a plurality of needle rollers 36 to constitute a roller assembly capable of relative rotations therebetween. In longitudinal section, each trunnion 22 has an outer periphery of straight shape, parallel to the axis of the trunnion 22. In cross section, the trunnion 22 has a generally ellipse shape with the major axis orthogonal to the axis of the joint. The inner periphery of each support ring 32 is arcuate and convex in section. This combines with the general elliptic cross sections of the trunnions 22 and the provision of predetermined clearances between the trunnions 22 and the support rings 32, to allow the support rings 32 to move along the axial directions of the trunnions 22 as well as make tilting movements with respect to the trunnions 22.Type: GrantFiled: July 19, 2002Date of Patent: April 13, 2004Assignee: NTN CorporationInventors: Hisaaki Kura, Kenji Terada, Tatsuhiro Goto, Akio Sakaguchi, Shigeyoshi Ishiguro, Kazuhiko Yoshida, Tatsuro Sugiyama
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Publication number: 20030130045Abstract: An annular support ring 32 is fitted onto the outer periphery of each trunnion 22. This support ring 32 and the roller 34 are unitized via a plurality of needle rollers 36 to constitute a roller assembly capable of relative rotations therebetween. In longitudinal section, each trunnion 22 has an outer periphery of straight shape, parallel to the axis of the trunnion 22. In cross section, the trunnion 22 has a generally ellipse shape with the major axis orthogonal to the axis of the joint. The inner periphery of each support ring 32 is arcuate and convex in section. This combines with the general elliptic cross sections of the trunnions 22 and the provision of predetermined clearances between the trunnions 22 and the support rings 32, to allow the support rings 32 to move along the axial directions of the trunnions 22 as well as make tilting movements with respect to the trunnions 22.Type: ApplicationFiled: July 19, 2002Publication date: July 10, 2003Applicant: NTN CORPORATIONInventors: Hisaaki Kura, Kenji Terada, Tatsuhiro Goto, Akio Sakaguchi, Shigeyoshi Ishiguro, Kazuhiko Yoshida, Tatsuro Sugiyama
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Patent number: 6579188Abstract: An annular support ring 32 is fitted onto the outer periphery of each trunnion 22. This support ring 32 and the roller 34 are unitized via a plurality of needle rollers 36 to constitute a roller assembly capable of relative rotations therebetween. In longitudinal section, each trunnion 22 has an outer periphery of straight shape, parallel to the axis of the trunnion 22. In cross section, the trunnion 22 has a generally ellipse shape with the major axis orthogonal to the axis of the joint. The inner periphery of each support ring 32 is arcuate and convex in section. This combines with the general elliptic cross sections of the trunnions 22 and the provision of predetermined clearances between the trunnions 22 and the support rings 32, to allow the support rings 32 to move along the axial directions of the trunnions 22 as well as make tilting movements with respect to the trunnions 22.Type: GrantFiled: July 19, 2002Date of Patent: June 17, 2003Assignee: NTN CorporationInventors: Hisaaki Kura, Kenji Terada, Tatsuhiro Goto, Akio Sakaguchi, Shigeyoshi Ishiguro, Kazuhiko Yoshida, Tatsuro Sugiyama
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Patent number: 6478682Abstract: An annular support ring 32 is fitted onto the outer periphery of each trunnion 22. This support ring 32 and the roller 34 are unitized via a plurality of needle rollers 36 to constitute a roller assembly capable of relative rotations therebetween. In longitudinal section, each trunnion 22 has an outer periphery of straight shape, parallel to the axis of the trunnion 22. In cross section, the trunnion 22 has a generally ellipse shape with the major axis orthogonal to the axis of the joint. The inner periphery of each support ring 32 is arcuate and convex in section. This combines with the general elliptic cross sections of the trunnions 22 and the provision of predetermined clearances between the trunnions 22 and the support rings 32, to allow the support rings 32 to move along the axial directions of the trunnions 22 as well as make tilting movements with respect to the trunnions 22.Type: GrantFiled: October 30, 2000Date of Patent: November 12, 2002Assignee: NTN CorporationInventors: Hisaaki Kura, Kenji Terada, Tatsuhiro Goto, Akio Sakaguchi, Shigeyoshi Ishiguro, Kazuhiko Yoshida, Tatsuro Sugiyama
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Publication number: 20020028711Abstract: A tripod type constant velocity universal joint of a single roller type is provided, which can be used in a vehicle operating at high angles without causing an increase in costs by lowering the level of vibration even at a high operating angle. A tripod type constant velocity universal joint is composed of an outer joint member with three track grooves, extending in its axial direction, on the inner circumferential surface of the outer joint member, a tripod member with three radially projecting leg shafts around the circumference of the tripod member, and rotatable rollers mounted on each leg shaft through a plurality of needle rollers and positioned in the track grooves of the outer joint member, the outer circumferential surfaces of the rollers being guided by roller guide surfaces provided on both sides of the track grooves. In this construction, grooves extending along the track grooves are provided on the roller guide surfaces where the rollers contact.Type: ApplicationFiled: July 19, 2001Publication date: March 7, 2002Inventors: Shigeyoshi Ishiguro, Tatsuro Sugiyama, Haruo Nagatani
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Patent number: 6322453Abstract: A perpendicular distance (PCR1) between a centerline (L1) including the center (O3) of the outer circumference surface (4b) of an outer roller (4), orthogonal to axis Z of a trunnion (2a) and a joint center O is shifted by &Dgr;h (=PCR1−PCR2) from a perpendicular distance (PCR2) between a centerline (L2) including the center (O1) of the outer circumference surface (3b) of an inner roller (3), orthogonal to axis Z of a trunnion (2a) and a joint center O. Under the most favorable conditions, PCR2 is shifted by an optimal amount of &Dgr;H from PCR1 toward the proximal end of the trunnion, and the position of contact (S) between the inner circumference surface (4a) of the outer roller 4 and the outer circumference surface (3b) of the inner roller (3) is located on the centerline (L1) (on PCR1) of the outer circumference surface (4b) of the outer roller (4).Type: GrantFiled: November 1, 1999Date of Patent: November 27, 2001Assignee: NTN CorporationInventors: Shigeyoshi Ishiguro, Kenji Terada, Yoshimasa Ushioda, Akio Sakaguchi, Hisaaki Kura, Katsuhiro Suzuki, Masaru Komatsu
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Patent number: 6264565Abstract: In a tripod type constant velocity universal joint having a roller (28) carried by each of three trunnions (25) of an inner joint member (24) and accommodated in one of three guide grooves (22) of an outer joint member (21) so that the roller (28) rolls along track surfaces (23) of the corresponding guide groove on its convex outer periphery, cooperating surface portions (31a and 31b) and/or (32a and 32b) being provided, which come in contact with each other when the roller (28) is about to tilt in a plane perpendicular to the axis of the outer joint member.Type: GrantFiled: December 20, 1999Date of Patent: July 24, 2001Assignee: NTN CorporationInventors: Tatsurou Sugiyama, Tatsuhiro Goto, Shigeyoshi Ishiguro, Kenji Terada, Hisaaki Kura
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Patent number: 6200224Abstract: This slidable constant velocity universal joint comprises an outer joint member 1, and a tripod member 4 having a plurality of axially extending leg shafts 5 and outer rings 3 which are rotatably fitted on the leg shafts 5 and whose outer peripheries 3b are spherical. The tripod member 4 is received inside the outer joint member 1, and the outer rings 3 of the tripod member 4 are fitted in track grooves 2 in the outer joint member 1 so that they are slidable axially of the outer joint member. A sliding contact region S where relative sliding between the outer ring 3 and the leg shaft 5 in the leg shaft direction occurs is defined between the outer ring 3 and the leg shaft 5, and the outer ring 3 is allowed to swing around the axis of the leg shaft 5. The center of curvature O of the outer periphery of the outer ring 3 coincides with the sliding contact region S, thereby preventing the outer ring 3 from exhibiting unstable behavior before and after specific phases (0°, 180°).Type: GrantFiled: June 30, 1999Date of Patent: March 13, 2001Assignee: NTN CorporationInventors: Tatsurou Sugiyama, Shigeyoshi Ishiguro, Hisaaki Kura
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Patent number: 5788578Abstract: A homokinetic joint which can be manufactured at low cost. Its outer ring and inner ring has a spherical inner surface and a spherical outer surface both formed with a plurality of track grooves in which are received torque transfer balls retained by a cage. The spherical inner surface and the track grooves of the outer ring are finished by plastic working, so that no additional finishing work is necessary. Thus, the outer ring can be manufactured at low cost.Type: GrantFiled: February 16, 1996Date of Patent: August 4, 1998Assignee: NTN CorporationInventors: Osamu Shimizu, Hisaaki Kura, Shigeyoshi Ishiguro, Shuji Mochinaga, Katsuyuki Ikei, Masami Yamaguchi, Kenichi Nakano, Morihisa Yoshioka