Patents by Inventor Shigeaki Yamanaka
Shigeaki Yamanaka 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: 6615476Abstract: A method is required in which a plate-like flange member may be firmly secured at the front end of a hollow shaft member through a plastic working treatment by virtue of caulking combination, so as to manufacture a hollow shaft having a flange at one end thereof.Type: GrantFiled: June 26, 2000Date of Patent: September 9, 2003Assignees: Fuji Jukogyo Kabushiki Kaisha, Kubota Iron Works Co., LTDInventors: Shigeaki Yamanaka, Masami Oguri
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Patent number: 6594895Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.Type: GrantFiled: October 9, 2001Date of Patent: July 22, 2003Assignees: Kubota Iron Works Co., Ltd., Fuji Jukogyo Kabushiki KaishaInventors: Shigeaki Yamanaka, Toshio Kobayashi
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Publication number: 20030074791Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.Type: ApplicationFiled: July 12, 2002Publication date: April 24, 2003Inventors: Shigeaki Yamanaka, Toshio Kobayashi
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Publication number: 20030070294Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.Type: ApplicationFiled: July 12, 2002Publication date: April 17, 2003Inventors: Shigeaki Yamanaka, Toshio Kobayashi
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Patent number: 6474062Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.Type: GrantFiled: October 28, 1999Date of Patent: November 5, 2002Assignees: Kubota Iron Works Co., Ltd., Fuji Jukogyo Kabushiki KaishaInventors: Shigeaki Yamanaka, Toshio Kobayashi
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Publication number: 20020038546Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.Type: ApplicationFiled: October 9, 2001Publication date: April 4, 2002Inventors: Shigeaki Yamanaka, Toshio Kobayashi
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Patent number: 6126388Abstract: A water pump is capable of avoiding adverse influence of water leakage from a swirl chamber to a bearing. The water pump includes a pump housing, a rotary shaft supported by a bearing mounted on a boss portion of the pump housing, an impeller fixed on an end portion of the rotary shaft extending into a swirl chamber defined within the pump housing, and a mechanical seal disposed between the impeller and the bearing. The water pump further includes a seal ring disposed within a space defined between the mechanical seal and the bearing for dividing the space into a first and second vapor chambers with drain holes provided for respective first and second vapor chambers.Type: GrantFiled: July 27, 1998Date of Patent: October 3, 2000Assignee: Kubota Iron Works CC. Ltd.Inventors: Shigeaki Yamanaka, Satsuo Morita
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Patent number: 5722138Abstract: A disc-shaped material is prepared by punching a high carbon steel plate or soft steel plate, and the disc-shaped material is fixed in position. An outer peripheral portion of the disc-shaped material is heated to a temperature of 400.degree.-500.degree. C. by means of a high frequency heater. The outer peripheral portion of the disc-shaped material is swaged to form a thickened portion by a swaging die and the thickened portion is then spun to plastically form a toothed gear to the outer peripheral portion of the disc-shaped material in two steps of coarse working and finish working by spinning dies. The thus formed toothed gear is further heated as occasion demands to a temperature of about 900.degree. C. for quenching.Type: GrantFiled: July 16, 1996Date of Patent: March 3, 1998Assignee: Kubota Iron Works Co., Ltd.Inventor: Shigeaki Yamanaka
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Patent number: 5699689Abstract: There is provided a method for forming a disc-shaped blank in which a disc-shaped thin plate material is, at an outer peripheral portion thereof, swaged towards an axial side of the plate material with a roll die to thicken the outer peripheral portion and is shaped into a cross-sectional configuration corresponding to that of a dish, the method comprises the steps of: sandwiching and securing between a pair of sandwiching members the disc-shaped thin plate material except for the outer peripheral portion including a swaging portion; swaging the swaging portion projecting from the sandwiching members so that an outermost end of the swaging portion may be shaped into a cross-sectional configuration corresponding to that of an arrowhead while a root portion of the swaging portion has the same thickness as the original thin thickness of the plate material; thereafter, bending the outer peripheral portion including the thick-walled swaged portion at the root portion thereof from one side surface of the disc-shapeType: GrantFiled: June 18, 1996Date of Patent: December 23, 1997Assignee: Kubota Iron Works Co., Ltd.Inventor: Shigeaki Yamanaka
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Patent number: 5562785Abstract: A disc-shaped material is prepared by punching a high carbon steel plate or soft steel plate, and the disc-shaped material is fixed in position. An outer peripheral portion of the disc-shaped material is heated to a temperature of 400.degree.-500.degree. C. y means of a high frequency heater. The outer peripheral portion of the disc-shaped material is swaged to form a thickened portion by a swaging die and the thickened portion is then spun to plastically form a toothed gear to the outer peripheral portion of the disc-shaped material in two steps of coarse working and finish working by spinning dies. The thus formed toothed gear is further heated as occasion demands to a temperature of about 900.degree. C. for quenching.Type: GrantFiled: April 18, 1995Date of Patent: October 8, 1996Assignee: Kubota Iron Works Co., Ltd.Inventor: Shigeaki Yamanaka
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Patent number: 5310432Abstract: A toothed wheel for use in automobiles and a method for its manufacture are disclosed. The toothed gear is of a dish-shaped disk having a thickened peripheral edge portion in an outer and/or inner side of which gear teeth are shaped, at least the surface area of the gear teeth being of a martensite structure, the disk being made of a steel comprising a ferrite-cementite-graphite structure in which 50% or more of cementite has been changed to graphite, the steel composition of the disk consisting essentially of, by weight %:C: 0.20-0.70%, Si: 0.05-1.00%, Mn: 0.05-0.50%, sol. Al: 0.01-1.00%, N: 0.002-0.010%, B: 0.0003-0.0050%, Ca: 0-0.01%, Cu: 0-1.00%, Ni: 0-2.00%,and a balance of Fe and incidental impurities in which the content of P is restricted to not larger than 0.020% and the content of S is restricted to not larger than 0.010%.Type: GrantFiled: June 29, 1993Date of Patent: May 10, 1994Assignees: Sumitomo Metal Industries, Ltd., Kubota Iron Works Co., Ltd.Inventors: Kiyoshi Fukui, Shigeaki Yamanaka
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Patent number: 5237745Abstract: A method of manufacturing a driver plate comprises the steps of swaging the outer peripheral portion of a disk-shaped raw material in the radial direction thereof using a swaging die so as to form the outer peripheral portion in a thick wall portion, holding the swaged material between an upper and a lower die and pressing the material through the upper and lower dies so as to form it into a dish-shaped blank, and pressing radially the thick-walled outer peripheral portion of the dish-shaped blank held between a support die disposed either on the outside or on the inside thereof and a gear tooth profile forming die so as to form gear teeth either on the radially outside or on the radially inside of the outer peripheral portion. As an alternative, gear teeth may be formed by cold rolling work or gear teeth cutting work using a gear hobbing machine or one of other gear teeth cutting machines.Type: GrantFiled: December 24, 1991Date of Patent: August 24, 1993Assignee: Kubota Iron Works Co., Ltd.Inventor: Shigeaki Yamanaka