Patents by Inventor Kenji Terada
Kenji Terada 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: 20070004523Abstract: The tripod member has three trunnions which are projected radially. Each of the trunnions carries a roller, and this roller is accommodated in one of the track grooves in the outer joint member. The outer peripheries of the rollers and the roller guideways make angular contact with each other. Support rings are fitted onto the outer peripheries of the trunnions. These support rings and the rollers are assembled (unitized) via a plurality of needle rollers to constitute roller assemblies capable of relative rotations. In longitudinal sections, the outer peripheries of the trunnions have straight shapes parallel to the axes of the trunnions. In cross sections, the outer peripheries are elliptic in shape, with their respective major axes perpendicular to the axis of the joint. The inner peripheries of the support rings have arcuate convex sections.Type: ApplicationFiled: September 6, 2006Publication date: January 4, 2007Inventors: Tatsuro Sugiyama, Tatsuhiro Goto, Kenji Terada, Kenta Yamazaki, Hisaaki Kura
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Patent number: 7118485Abstract: The tripod member has three trunnions which are projected radially. Each of the trunnions carries a roller, and this roller is accommodated in one of the track grooves in the outer joint member. The outer peripheries of the rollers and the roller guideways make angular contact with each other. Support rings are fitted onto the outer peripheries of the trunnions. These support rings and the rollers are assembled (unitized) via a plurality of needle rollers to constitute roller assemblies capable of relative rotations. In longitudinal sections, the outer peripheries of the trunnions have straight shapes parallel to the axes of the trunnions. In cross sections, the outer peripheries are elliptic in shape, with their respective major axes perpendicular to the axis of the joint. The inner peripheries of the support rings have arcuate convex sections.Type: GrantFiled: March 16, 2004Date of Patent: October 10, 2006Assignee: NTN CorporationInventors: Tatsuro Sugiyama, Tatsuhiro Goto, Kenji Terada, Kenta Yamazaki, Hisaaki Kura
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Publication number: 20060199651Abstract: A tripod constant velocity universal joint including an outer joint member having three axial track grooves in an inner periphery and roller guide surfaces formed in opposing side walls of each track groove. A tripod member has three radially projecting trunnion journals and rollers that rotate around respective trunnion journals through a plurality of needle rollers and are received in the track grooves of the outer joint member. Each roller is guided on an outer peripheral surface by the roller guide surfaces. Contact between the roller and roller guide surfaces is circular having a contact ratio that is 1.01 or higher. The contact ratio is defined by a widthwise length of the contact ellipse formed by the roller contacting the guide surface relative to the width of said roller.Type: ApplicationFiled: January 13, 2006Publication date: September 7, 2006Inventors: Yukihiro Watanabe, Hideki Kondo, Kenji Terada, Hisaaki Kura
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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: 7040990Abstract: A tripod constant velocity universal joint including an outer joint member having axially extending track grooves formed at three circumferentially equispaced positions in the inner periphery. A tripod member has a trunnion barrel adapted to be fitted to a shaft for torque transmission and trunnion journals radially projecting from three circumferentially equispaced positions in the trunnion barrel, and rollers rotatable around the associated trunnion journal for rotation through a plurality of needle rollers and received in the track grooves. Each roller is guided at its outer peripheral surface by roller guide surfaces formed in opposite lateral walls of the track groove. The torsional strength of the tripod member and the smallest outer diameter portion of the shaft are set to be substantially equal. Also, the surface pressure on the trunnion journals in rolling contact with the needle rollers is allowed up to a predetermined value.Type: GrantFiled: September 7, 2004Date of Patent: May 9, 2006Assignee: NTN CorporationInventors: Yukihiro Watanabe, Hideki Kondo, Kenji Terada, Hisaaki Kura
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Patent number: 7022020Abstract: A tripod constant velocity universal joint including an outer joint member having three axial track grooves in an inner periphery and roller guide surfaces formed in opposing side walls of each track groove. A tripod member has three radially projecting trunnion journals and rollers that rotate around respective trunnion journals through a plurality of needle rollers and are received in the track grooves of the outer joint member. Each roller is guided on an outer peripheral surface by the roller guide surfaces. Contact between the roller and roller guide surfaces is circular having a contact ratio that is 1.01 or higher. The contact ratio is defined by a widthwise length of the contact ellipse formed by the roller contacting the guide surface relative to the width of said roller.Type: GrantFiled: May 11, 2001Date of Patent: April 4, 2006Assignee: NTN CorporationInventors: Yukihiro Watanabe, Hideki Kondo, Kenji Terada, Hisaaki Kura
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Publication number: 20050026705Abstract: With notice taken of the facts that the conventional tripod joints are designed with particular attention paid to the aspect of strength, particularly the strength of the shaft and that in the aspect of durability there is some room in the ordinary use, while considering balance between strength and durability, the size of the shell of the outer joint member is reduced as much as possible, so that weight reduction and compactification of the tripod joint are achieved.Type: ApplicationFiled: September 7, 2004Publication date: February 3, 2005Inventors: Yukihiro Watanabe, Hideki Kondo, Kenji Terada, Hisaaki Kura
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Publication number: 20040222015Abstract: The present invention provides a method of manufacturing printed a circuit board capable of formation of via holes having a low aspect ratio and formation of fine lines, and a printed circuit board manufactured by the method. The method of manufacturing a printed circuit board 10 according to the present invention includes a step of selectively forming a plating layer 16 for lands 22a and 22b on a metal foil 14 on the printed circuit board 10, a step of adjusting the thickness of the plating layer 16, and a step of forming the metal foil 14 into lines 14a. The aspect ratio of via holes 28 formed on lands 22a and 22b can be adjusted by adjusting the thickness of the lands 22a and 22b.Type: ApplicationFiled: May 26, 2004Publication date: November 11, 2004Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Kohichi Ohsumi, Kenji Terada, Kohichi Yamazaki
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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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Publication number: 20040176173Abstract: The tripod member has three trunnions which are projected radially. Each of the trunnions carries a roller, and this roller is accommodated in one of the track grooves in the outer joint member. The outer peripheries of the rollers and the roller guideways make angular contact with each other. Support rings are fitted onto the outer peripheries of the trunnions. These support rings and the rollers are assembled (unitized) via a plurality of needle rollers to constitute roller assemblies capable of relative rotations. In longitudinal sections, the outer peripheries of the trunnions have straight shapes parallel to the axes of the trunnions. In cross sections, the outer peripheries are elliptic in shape, with their respective major axes perpendicular to the axis of the joint. The inner peripheries of the support rings have arcuate convex sections.Type: ApplicationFiled: March 16, 2004Publication date: September 9, 2004Applicant: NTN CORPORATIONInventors: Tatsuro Sugiyama, Tatsuhiro Goto, Kenji Terada, Kenta Yamazaki, Hisaaki Kura
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Patent number: 6745365Abstract: An encoder and a decoder each having an error correcting operation, and a data transmission apparatus using them for data transmission in a multilevel modulation system. In transmission data is converted into parallel data. One bit thereof is inputted to a convolutional encoder to output two bits. Two bit data and another signal of the parallel data not inputted to the convolutional encoder are respectively separated into real part and imaginary part to independently decide signal points for the parallel data. In reception an area is similarly decided independently for real and imaginary parts and metric is assigned for the data. Real and imaginary parts are combined with each other for Viterbi decoding. Result thereof is fed to a convolutional encoder similar in constitution to that on transmission side. Using convolutional encoding output and decided area, transmission data is decoded.Type: GrantFiled: December 28, 2000Date of Patent: June 1, 2004Assignees: Hitachi Kokusai Electric Inc., Nippon Hoso KyokaiInventors: Yoshiro Kokuryo, Atsushi Mizuno, Kunihiko Kondo, Nobuo Tsukamoto, Kenji Terada, Tetsuomi Ikeda
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Patent number: 6726570Abstract: The tripod member has three trunnions which are projected radially. Each of the trunnions carries a roller, and this roller is accommodated in one of the track grooves in the outer joint member. The outer peripheries of the rollers and the roller guideways make angular contact with each other. Support rings are fitted onto the outer peripheries of the trunnions. These support rings and the rollers are assembled (unitized) via a plurality of needle rollers to constitute roller assemblies capable of relative rotations. In longitudinal sections, the outer peripheries of the trunnions have straight shapes parallel to the axes of the trunnions. In cross sections, the outer peripheries are elliptic in shape, with their respective major axes perpendicular to the axis of the joint. The inner peripheries of the support rings have arcuate convex sections.Type: GrantFiled: January 10, 2003Date of Patent: April 27, 2004Assignee: NTN CorporationInventors: Tatsuro Sugiyama, Tatsuhiro Goto, Kenji Terada, Kenta Yamazaki, Hisaaki Kura
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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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Patent number: 6632143Abstract: The tripod member has three trunnions which are projected radially. Each of the trunnions carries a roller, and this roller is accommodated in one of the track grooves in the outer joint member. The outer peripheries of the rollers and the roller guideways make angular contact with each other. Support rings are fitted onto the outer peripheries of the trunnions. These support rings and the rollers are assembled (unitized) via a plurality of needle rollers to constitute roller assemblies capable of relative rotations. In longitudinal sections, the outer peripheries of the trunnions have straight shapes parallel to the axes of the trunnions. In cross sections, the outer peripheries are elliptic in shape, with their respective major axes perpendicular to the axis of the joint. The inner peripheries of the support rings have arcuate convex sections.Type: GrantFiled: March 26, 2001Date of Patent: October 14, 2003Assignee: NTN CorporationInventors: Tatsuro Sugiyama, Tatsuhiro Goto, Kenji Terada, Kenta Yamazaki, Hisaaki Kura
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Publication number: 20030130046Abstract: The tripod member has three trunnions which are projected radially. Each of the trunnions carries a roller, and this roller is accommodated in one of the track grooves in the outer joint member. The outer peripheries of the rollers and the roller guideways make angular contact with each other. Support rings are fitted onto the outer peripheries of the trunnions. These support rings and the rollers are assembled (unitized) via a plurality of needle rollers to constitute roller assemblies capable of relative rotations. In longitudinal sections, the outer peripheries of the trunnions have straight shapes parallel to the axes of the trunnions. In cross sections, the outer peripheries are elliptic in shape, with their respective major axes perpendicular to the axis of the joint. The inner peripheries of the support rings have arcuate convex sections.Type: ApplicationFiled: January 10, 2003Publication date: July 10, 2003Applicant: NTN CORPORATIONInventors: Tatsuro Sugiyama, Tatsuhiro Goto, Kenji Terada, Kenta Yamazaki, Hisaaki Kura
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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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Publication number: 20030083135Abstract: A fixed constant velocity joint is provided, which is suitable for an application where a rotational backlash should be avoided. A pressing member is attached to a shaft, and simultaneously a receiving member is attached to a cage. Then, an elastic force of an elastic member elastically bring a pressing part of the pressing member in contact with a receiving part of the receiving member. As a result, an inner race and a cage relatively travel in the axial direction, balls are pushed toward a direction along which wedge-shape ball tracks narrow, and consequently a track clearance in the axial direction decreases.Type: ApplicationFiled: October 21, 2002Publication date: May 1, 2003Inventors: Kenta Yamazaki, Junichi Izumino, Kenji Terada, Hisaaki Kura
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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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Patent number: 6475092Abstract: A constant velocity universal joint with a further reduction in inductive thrust and slide resistance. The constant velocity universal joint comprises: an outer joint member 10 having three track grooves 12 each having circumferentially-opposed roller guideways 14; a tripod member 20 having three radially-projecting trunnions 22; a roller 34 inserted in each of the track grooves 12; and a ring 32 fitted on each of the trunnions 22 to support the roller 34 rotatably, the roller 34 being movable in axial directions of the outer joint member 1 along the roller guideways 14. Here, the inner periphery of the ring 32 is shaped arcuate and convex in section. The outer periphery of each of the trunnions 22 is shaped straight in longitudinal section, as well as formed in cross section so as to make a contact with the inner periphery of the ring 32 along a direction perpendicular to the axis of the joint and create a clearance with the inner periphery of the ring 32 in an axial direction of the joint.Type: GrantFiled: December 4, 2000Date of Patent: November 5, 2002Assignee: NTN CorporationInventors: Hisaaki Kura, Tatsuro Sugiyama, Masayuki Kuroda, Kenji Terada