Patents by Inventor Yasunori Yokota
Yasunori Yokota 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: 7252436Abstract: A roller bearing cage is disclosed, which is provided inexpensively from basic minimum quantity of row material. The roller bearing cage is made with a production method using rolling operations, which is the absence of the formation of chips, while ensuring the strength and stiffness of the cage. A circular inside surface of the cage is made to give an advantage to the rolling operations. The circular inside surface is circularly recessed to have a concaved surface of just one radius of curvature R. A diametral dimension across diametrically opposing bottoms of the circular recess is made larger than the pitch circle distance P.C.D. Pillars of the cage have inside retainer lips, which are hard to make any engagement with their associated rollers, which might worsen the engine performance.Type: GrantFiled: February 11, 2005Date of Patent: August 7, 2007Assignee: Nippon Thompson Co., Ltd.Inventors: Yasunori Yokota, Kengo Hidano, Shouji Nagao
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Patent number: 7125192Abstract: A ball-stud joint having a flange on a stud thereof, the flange having a sloping side for making it easy to locate centrally the stud relatively to a lower die jig. The ball stud is comprised of a ball fit for pivoting movement into a major body, a stud having a plain end adapted to be formed into a rivet head to joint the stud with any counterpart, and a flange formed integrally around the stud to provide a surface coming into abutment against the counterpart. The flange has a sloping side extending radially outwardly from a flat surface facing on to the ball to an outside periphery of the flange in such a way that the sloping side comes into engagement with a slantwise bearing area on a lower die jig when the plain end of the stud is formed into rivet head.Type: GrantFiled: February 23, 2004Date of Patent: October 24, 2006Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 6981801Abstract: A roller bearing cage is disclosed in which a pair of semicircular cage halves is assembled with their mating ends thereof coming into abutment against each other. The mating ends are chamfered off to stave off bearing failure resulting from any deformation that might occur at the areas nearby the mating ends owing to large centrifugal force imposed by high-speed engines. The roller bearing cage may be completed by only joining together the semicircular cage halves with their diametral mating ends coming into engagement with one another. Each of the semicircular cage halves is composed of axially opposing semicircular rims and cage bars interposed between the rims, thus helping ensure stiffness with even weighing less. The chamfering operation is done to make even any outer peripheral areas nearby the mating ends, preparatory to cutoff operation to split a cylindrical cage stock into two halves. This helps the process management of material-removal work to make the chamfered even areas.Type: GrantFiled: October 20, 2003Date of Patent: January 3, 2006Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Publication number: 20050185874Abstract: A roller bearing cage is disclosed, which is provided inexpensively from basic minimum quantity of row material. The roller bearing cage is made with a production method using rolling operations, which is the absence of the formation of chips, while ensuring the strength and stiffness of the cage. A circular inside surface of the cage is made to give an advantage to the rolling operations. The circular inside surface is circularly recessed to have a concaved surface of just one radius of curvature R. A diametral dimension across diametrically opposing bottoms of the circular recess is made larger than the pitch circle distance P.C.D. Pillars of the cage have inside retainer lips, which are hard to make any engagement with their associated rollers, which might worsen the engine performance.Type: ApplicationFiled: February 11, 2005Publication date: August 25, 2005Applicant: Nippon Thompson Co., Ltd.Inventors: Yasunori Yokota, Kengo Hidano, Shouji Nagao
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Publication number: 20040165941Abstract: A ball-stud joint having a flange on a stud thereof, the flange having a sloping side for making it easy to locate centrally the stud relatively to a lower die jig. The ball stud is comprised of a ball fit for pivoting movement into a major body, a stud having a plain end adapted to be formed into a rivet head to joint the stud with any counterpart, and a flange formed integrally around the stud to provide a surface coming into abutment against the counterpart. The flange has a sloping side extending radially outwardly from a flat surface facing on to the ball to an outside periphery of the flange in such a way that the sloping side comes into engagement with a slantwise bearing area on a lower die jig when the plain end of the stud is formed into rivet head.Type: ApplicationFiled: February 23, 2004Publication date: August 26, 2004Applicant: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 6767135Abstract: A roller bearing cage having load capacity large enough to bear severe conditions imposed by high-speed engines, with even lighter in weight. In the roller bearing cage, the cage bars are each made up of axially opposite thick ends and a slim mid-area lying midway the thick ends to define a recess between them. The cage bar has radially outside projections on an outside periphery thereof while radially inside projections on an inside periphery thereof to keep the rollers against escape out of the cage. The radially inside projections extend circumferentially of the cage, especially, at a circular edge of the thick end, which lies nearby or neighboring or closer to the recess. The radially inside projections are made by forcing material at the edge to move circumferentially by plastic flow into the projections that extend circumferentially towards pockets on a radially inside circular surface of the thick end.Type: GrantFiled: September 19, 2002Date of Patent: July 27, 2004Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Publication number: 20040081382Abstract: A roller bearing cage is disclosed in which a pair of semicircular cage halves is assembled with their mating ends thereof coming into abutment against each other. The mating ends are chamfered off to stave off bearing failure resulting from any deformation that might occur at the areas nearby the mating ends owing to large centrifugal force imposed by high-speed engines. The roller bearing cage may be completed by only joining together the semicircular cage halves with their diametral mating ends coming into engagement with one another. Each of the semicircular cage halves is composed of axially opposing semicircular rims and cage bars interposed between the rims, thus helping ensure stiffness with even weighing less. The chamfering operation is done to make even any outer peripheral areas nearby the mating ends, preparatory to cutoff operation to split a cylindrical cage stock into two halves. This helps the process management of material-removal work to make the chamfered even areas.Type: ApplicationFiled: October 20, 2003Publication date: April 29, 2004Applicant: NIPPON THOMPSON CO., LTD.Inventor: Yasunori Yokota
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Patent number: 6666584Abstract: A roller bearing cage is disclosed in which a pair of semicircular cage halves is assembled with their mating ends thereof coming into abutment against each other. The mating ends are chamfered off to stave off bearing failure resulting from any deformation that might occur at the areas nearby the mating ends owing to large centrifugal force imposed by high-speed engines. The roller bearing cage may be completed by only joining together the semicircular cage halves with their diametral mating ends coming into engagement with one another. Each of the semicircular cage halves is composed of axially opposing semicircular rims and cage bars interposed between the rims, thus helping ensure stiffness with even weighing less. The chamfering operation is done to make even any outer peripheral areas nearby the mating ends, preparatory to cutoff operation to split a cylindrical cage stock into two halves. This helps the process management of material-removal work to make the chamfered even areas.Type: GrantFiled: December 28, 2001Date of Patent: December 23, 2003Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Publication number: 20030053727Abstract: A roller bearing cage having load capacity large enough to bear severe conditions imposed by high-speed engines, with even lighter in weight. In the roller bearing cage, the cage bars are each made up of axially opposite thick ends and a slim mid-area lying midway the thick ends to define a recess between them. The cage bar has radially outside projections on an outside periphery thereof while radially inside projections on an inside periphery thereof to keep the rollers against escape out of the cage. The radially inside projections extend circumferentially of the cage, especially, at just a circular edge of the thick end, which lies nearby or neighboring or closer to the recess. The radially inside projections are made by forcing material at the edge to move circumferentially by plastic flow into the projections that extend circumferentially towards pockets on a radially inside circular surface of the thick end.Type: ApplicationFiled: September 19, 2002Publication date: March 20, 2003Applicant: NIPPON THOMPSON CO., LTDInventor: Yasunori Yokota
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Publication number: 20020085783Abstract: A roller bearing cage is disclosed in which a pair of semicircular cage halves is assembled with their mating ends thereof coming into abutment against each other. The mating ends are chamfered off to stave off bearing failure resulting from any deformation that might occur at the areas nearby the mating ends owing to large centrifugal force imposed by high-speed engines. The roller bearing cage may be completed by only joining together the semicircular cage halves with their diametral mating ends coming into engagement with one another. Each of the semicircular cage halves is composed of axially opposing semicircular rims and cage bars interposed between the rims, thus helping ensure stiffness with even weighing less. The chamfering operation is done to make even any outer peripheral areas nearby the mating ends, preparatory to cutoff operation to split a cylindrical cage stock into two halves. This helps the process management of material-removal work to make the chamfered even areas.Type: ApplicationFiled: December 28, 2001Publication date: July 4, 2002Inventor: Yasunori Yokota
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Patent number: 5803620Abstract: The present invention discloses a roller and cage assembly that inhibits generation of heat and in turn, prevents the occurrence of seizure, thereby attaining a long service life while also offering various other advantages.By cutting away the outside of a cage (1) in order to completely remove indentations (1j) formed during machining of outer retaining projections, the outer surface of those outer retaining projections (1h.sub.1) is made to coincide with the normal diameter (D.sub.0) of the cage (1). As a result of employing this constitution, even if the roller guide surfaces of the columns (1c) of the cage (1) become worn, the rollers (2) do not make contact with the outer retaining projections (1h.sub.1). In addition, since the above-mentioned indentations do not remain, the contact surface area with an attaching partner is increased, thereby reducing contact pressure, thereby allowing the object described above to be attained.Type: GrantFiled: February 13, 1997Date of Patent: September 8, 1998Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 5540506Abstract: Firstly, a roller and cage assembly is disclosed that achieves improved lubricating property while maintaining or increasing rigidity. While concave portions are formed so as to extend the width of the central portion of pockets to allow these to act as oil grooves, on the other hand, padding equivalent to lightening holes that are removed by providing said concave portions is performed in columns to obtain high rigidity.Secondly, a roller and cage assembly is disclosed that together with being inexpensive and having high wear resistance, suppresses the generation of heat resulting from high-speed rotation. The above-mentioned effects are obtained by forming a composite plated film at prescribed sites by uniform dispersed coprecipitation of fine particles of fluororesin.Thirdly, a roller and cage assembly is disclosed that together with suppressing the generation of heat resulting from high-speed rotation, also achieves light weight. The above-mentioned effects are obtained by using ceramic rollers.Type: GrantFiled: February 23, 1994Date of Patent: July 30, 1996Assignee: Nippon Thompson Co., Ltd.Inventors: Yasunori Yokota, Kengo Hidano, Takashi Yatsu
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Patent number: 5482385Abstract: Firstly, a roller and cage assembly is disclosed that achieves improved lubricating property while maintaining or increasing rigidity. While concave portions are formed so as to extend the width of the central portion of pockets to allow these to act as oil grooves, on the other hand, padding equivalent to lightening holes that are removed by providing said concave portions is performed in columns to obtain high rigidity.Secondly, a roller and cage assembly is disclosed that together with being inexpensive and having high wear resistance, suppresses the generation of heat resulting from high-speed rotation. The above-mentioned effects are obtained by forming a composite plated film at prescribed sites by uniform dispersed coprecipitation of fine particles of fluororesin.Thirdly, a roller and cage assembly is disclosed that together with suppressing the generation of heat resulting from high-speed rotation, also achieves light weight. The above-mentioned effects are obtained by using ceramic rollers.Type: GrantFiled: October 12, 1994Date of Patent: January 9, 1996Assignee: Nippon Thompson Co., Ltd.Inventors: Yasunori Yokota, Kengo Hidano, Takashi Yatsu
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Patent number: 5172986Abstract: A cage and roller type roller bearing is provided. The bearing generally include a cylindrical cage and a plurality of rollers which are maintained in position by the cage. The cage includes a pair of circumferential sections and a plurality of axial sections extending between the pair of circumferential sections and spaced apart at a predetermined pitch in the circumferential direction to thereby define a plurality of windows each receiving therein a corresponding roller rotatably and generally rectangular in shape and somewhat larger in size than the roller. Each of the axial sections has its central inner portion of its inner surface removed to define an inner recess so that the axial section is divided into a relatively thin central portion and a pair of relatively thick end portions.Type: GrantFiled: August 1, 1991Date of Patent: December 22, 1992Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 4799302Abstract: There is a holding device of a rolling bearing for rectilinear motion in which a plurality of rolling members such as balls or rollers are rectilinearly arranged at regular intervals in track grooves or track surfaces. This holding device has a rectangular plate-like shape made of a plastic material. Many windows are formed at regular intervals in the longitudinal direction of the holding device. Each window is formed so as to have the relation of S<L<D<E (where, S and L are outside diameters on both sides of the window and E is an inside diameter thereof and D is a diameter of each ball). The outside diameter of the adjacent windows in the same side surface of the holding device differ. This holding device is manufactured by injecting and molding a plastic material into the rectangular molding die at high pressure and high temperature. In this case, many barrel-shaped window pins are disposed in the cavity of the die at regular intervals in its longitudinal direction.Type: GrantFiled: May 5, 1987Date of Patent: January 24, 1989Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 4701059Abstract: There is a holding device of a rolling bearing for rectilinear motion in which a plurality of rolling members such as balls or rollers are rectilinearly arranged at regular intervals in track grooves or track surfaces. This holding device has a rectangular plate-like shape made of a plastic material. Many windows are formed at regular intervals in the longitudinal direction of the holding device. Each window is formed so as to have the relation of S<L<D<E (where, S and L are outside diameters on both sides of the window and E is an inside diameter thereof and D is a diameter of each ball). The outside diameter of the adjacent windows in the same side surface of the holding device differ. This holding device is manufactured by injecting and molding a plastic material into the rectangular molding die at high pressure and high temperature. In this case, many barrel-shaped window pins are disposed in the cavity of the die at regular intervals in its longitudinal direction.Type: GrantFiled: May 15, 1986Date of Patent: October 20, 1987Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 4699521Abstract: A structure for mounting an attachment member to a linear motion rolling contact bearing assembly including a bed, a table and a plurality of rolling members interposed between the bed and the table thereby providing a relative motion between the table and the bed. The mounting structure includes an alignment hole defined in the bed or table, a mounting hole defined in the attachment member, a counter member provided with a threaded hole and a bolt extending through the aligned mounting and alignment holes to be threaded into the threaded hole of the counter member with its head in engagement with the attachment member. In the preferred embodiment, the counter member has a contact surface which is substantially the same as and located opposite to a contact surface of the attachment member.Type: GrantFiled: January 16, 1987Date of Patent: October 13, 1987Assignee: Nippon Thompson Company, Ltd.Inventor: Yasunori Yokota
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Patent number: 4688950Abstract: A linear motion roller bearing for allowing an object such as a slider to move along a straight line defined, for example, by a track rail includes an endless path and a plurality of rollers having substantially the same size in diameter and height, which are arranged in contact in the endless path with their axes of rotation directed as rotated over 90.degree. alternately with respect to the longitudinal axis of the endless path. The endless path includes a pair of straight portions and a pair of semicircularly curved portions each of which connects the corresponding ends of the pair of straight portions. Each of the curved portions is so structured that the maximum number of rollers which can be present therein ranges between (even number +0.1) and (even number +0.5) if the pair of straight portions are not provided on the same horizontal plane and between (integer +0.1) and (integer +0.5) if the pair of straight portions are provided on the same horizontal plane or a plane close thereto.Type: GrantFiled: June 26, 1984Date of Patent: August 25, 1987Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota
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Patent number: 4655613Abstract: A linear motion rolling contact bearing assembly includes a trough-shaped bed, a trough-shaped table which straddles the bed, a plurality of balls interposed between the table and the bed for providing a relative motion between the table and the bed along the longitudinal direction of the assembly, and a retainer for retaining the balls in position. The retainer includes an elongated plate provided with a plurality of holding holes for holding the balls in position and at least one side projection which projects sideways from the plate so as to maintain the retainer in its intended position. Preferably, the top and bottom side projections are provided on both sides of the plate so that the retainer has an I-shaped cross section. The retainer is also preferably provided with one or more tabs provided around each of the holding holes so as to securely hold the balls in position. The side projections may be provided also in the form of a plurality of dots.Type: GrantFiled: September 20, 1985Date of Patent: April 7, 1987Assignee: Nippon Thompson Co., Ltd.Inventor: Yasunori Yokota