Patents by Inventor Kenji Ohmi
Kenji Ohmi 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: 10816076Abstract: A plastic helical gear has a three-dimensional tooth surface modification section on a tooth surface of each of involute-shaped teeth. The three-dimensional tooth surface modification section is a combined surface of a tooth top modification surface and an arc crowning surface. The tooth top modification surface is reduced in tooth thickness from a position between a tooth top and a tooth root toward the tooth top. The arc crowning surface is reduced in tooth thickness from a position between one end in the tooth width direction and the other end in the tooth width direction toward both ends in the tooth width direction. A line extending from an intersection point P0 between the starting position of the tooth top modification surface and the apex position of the arc crowning surface to the tooth root is aligned with a line on the tooth surface of the involute-shaped tooth.Type: GrantFiled: July 26, 2016Date of Patent: October 27, 2020Assignee: ENPLAS CORPORATIONInventor: Kenji Ohmi
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Patent number: 10584784Abstract: A resin helical gear is formed by setting a first machining reference line obliquely coupling a tooth tip side of a first tooth to a tooth root side of a second tooth on another end side in the tooth width direction along a tooth surface, and a second machining reference line obliquely coupling a tooth tip side of the second tooth to a tooth root side of the first tooth along the tooth surface. Then, the tooth surface is cut out from the first machining reference line to the tooth root of the first tooth while the tooth surface is cut out from the second machining reference line to the tooth root of the second tooth. Then, an involute tooth profile form is left on a tooth tip side of the tooth with respect to the first machining reference line and the second machining reference line.Type: GrantFiled: November 20, 2015Date of Patent: March 10, 2020Assignee: ENPLAS CORPORATIONInventor: Kenji Ohmi
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Publication number: 20180274649Abstract: A plastic helical gear has a three-dimensional tooth surface modification section on a tooth surface of each of involute-shaped teeth. The three-dimensional tooth surface modification section is a combined surface of a tooth top modification surface and an arc crowning surface. The tooth top modification surface is gradually reduced in tooth thickness from a position between a tooth top and a tooth root toward the tooth top. The arc crowning surface is gradually reduced in tooth thickness from a position between one end in the tooth width direction and the other end in the tooth width direction toward both ends in the tooth width direction. A line extending from an intersection point P0 between the starting position of the tooth top modification surface and the apex position of the arc crowning surface to the tooth root is aligned with a line on the tooth surface of the involute-shaped tooth.Type: ApplicationFiled: July 26, 2016Publication date: September 27, 2018Inventor: Kenji OHMI
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Patent number: 10012303Abstract: Provided is a fiber reinforced resin gear whose durability in use under a high temperature is enhanced. A fiber reinforced resin gear is formed by injecting a resin material containing glass wool into the inside of a cavity of a mold. A fiber diameter of the glass wool is scattered in a wide range of 0.1 to 15 ?m, and is distributed such that a most frequent value of the fiber diameter appears within a range of 2 to 5 ?m, and an average fiber diameter of the glass wool falls within a range of 3 to 5 ?m. The fiber reinforced resin gear according to the present invention can enhance durability and abrasion resistance under a high temperature compared to a conventional fiber reinforced resin gear.Type: GrantFiled: April 15, 2014Date of Patent: July 3, 2018Assignee: ENPLAS CORPORATIONInventors: Kenji Ohmi, Toru Murakami, Masaya Tsukamoto
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Publication number: 20180066744Abstract: A gear including plural teeth 3 to mesh with teeth of a corresponding gear to thereby transmit a rotational motion is provided. A form (b) of a tooth root side of each tooth 3 includes: a first curved surface c that is smoothly connected to a tooth surface a having an involute curve and has a profile expressed by a curve that is convex in an inverse direction of the involute curve of the tooth surface a; and a second curved surface d that is smoothly connected to the first curved surface c and has a profile defined by a hyperbolic function having a curve being convex in the same direction as the first curved surface c. It is possible to reduce a stress generated on the tooth root side at the time of meshing with teeth of the corresponding gear and thus to increase the strength of the teeth.Type: ApplicationFiled: November 13, 2017Publication date: March 8, 2018Inventor: Kenji OHMI
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Publication number: 20170335942Abstract: A resin helical gear is formed by setting a first machining reference line obliquely coupling a tooth tip side of a first tooth to a tooth root side of a second tooth on another end side in the tooth width direction along a tooth surface, and a second machining reference line obliquely coupling a tooth tip side of the second tooth to a tooth root side of the first tooth along the tooth surface. Then, the tooth surface is cut out from the first machining reference line to the tooth root of the first tooth while the tooth surface is cut out from the second machining reference line to the tooth root of the second tooth. Then, an involute tooth profile form is left on a tooth tip side of the tooth with respect to the first machining reference line and the second machining reference line.Type: ApplicationFiled: November 20, 2015Publication date: November 23, 2017Inventor: Kenji OHMI
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Patent number: 9550243Abstract: A gear includes teeth 3 to be engaged with teeth of a corresponding gear to transmit a rotational motion, in which a form (b) of a tooth root side of each tooth 3 includes: a first curved surface c which smoothly connects with a tooth surface a having an involute curve and has a profile represented by a curve which is convex in a direction opposite to the involute curve of the tooth surface a; and a second curved surface d which smoothly connects with the first curved surface c and has a profile defined by a quadratic function having a curve being convex in the same direction as that of the first curved surface c. Therefore, a stress generated on the tooth root side at the time of engagement with the teeth of the corresponding gear can be reduced, and the strength of the teeth can be increased.Type: GrantFiled: September 20, 2013Date of Patent: January 24, 2017Assignee: ENPLAS CORPORATIONInventor: Kenji Ohmi
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Publication number: 20160047453Abstract: Provided is a fiber reinforced resin gear whose durability in use under a high temperature is enhanced. A fiber reinforced resin gear is formed by injecting a resin material containing glass wool into the inside of a cavity of a mold. A fiber diameter of the glass wool is scattered in a wide range of 0.1 to 15 ?m, and is distributed such that a most frequent value of the fiber diameter appears within a range of 2 to 5 ?m, and an average fiber diameter of the glass wool falls within a range of 3 to 5 ?m. The fiber reinforced resin gear according to the present invention can enhance durability and abrasion resistance under a high temperature compared to a conventional fiber reinforced resin gear.Type: ApplicationFiled: April 15, 2014Publication date: February 18, 2016Applicant: Enplas CorporationInventors: Kenji OHMI, Toru MURAKAMI, Masaya TSUKAMOTO
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Publication number: 20150211622Abstract: A gear including plural teeth 3 to mesh with teeth of a corresponding gear to thereby transmit a rotational motion is provided. A form (b) of a tooth root side of each tooth 3 includes: a first curved surface c that is smoothly connected to a tooth surface a having an involute curve and has a profile expressed by a curve that is convex in an inverse direction of the involute curve of the tooth surface a; and a second curved surface d that is smoothly connected to the first curved surface c and has a profile defined by a hyperbolic function having a curve being convex in the same direction as the first curved surface c. It is possible to reduce a stress generated on the tooth root side at the time of meshing with teeth of the corresponding gear and thus to increase the strength of the teeth.Type: ApplicationFiled: September 17, 2013Publication date: July 30, 2015Inventor: Kenji Ohmi
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Publication number: 20140090503Abstract: A gear includes teeth 3 to be engaged with teeth of a corresponding gear to transmit a rotational motion, in which a form (b) of a tooth root side of each tooth 3 includes: a first curved surface c which smoothly connects with a tooth surface a having an involute curve and has a profile represented by a curve which is convex in a direction opposite to the involute curve of the tooth surface a; and a second curved surface d which smoothly connects with the first curved surface c and has a profile defined by a quadratic function having a curve being convex in the same direction as that of the first curved surface c. Therefore, a stress generated on the tooth root side at the time of engagement with the teeth of the corresponding gear can be reduced, and the strength of the teeth can be increased.Type: ApplicationFiled: September 20, 2013Publication date: April 3, 2014Applicant: ENPLAS CORPORATIONInventor: Kenji OHMI
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Patent number: 8201471Abstract: In a gear (G1) according to the present invention, which is provided with a plurality of teeth (1) to be mated with teeth of a mating gear to thereby transmit a rotational motion, a predetermined region (A) in at least one tooth flank (7) of each tooth (1) is formed in a configuration such that, from at least one place in a tooth width direction on a crossing (8) of the tooth flank (7) and a tooth tip surface (3), the mating with the teeth of the mating gear is started with the point contact or the line contact shorter than the total tooth width, and thereafter, is gradually shifted to the line contact so that the length of contact line (10) thereof is sequentially increased as the line contact moves from a tooth tip surface (3) side toward a tooth root side.Type: GrantFiled: September 25, 2009Date of Patent: June 19, 2012Assignee: Enplas CorporationInventors: Kenji Ohmi, Yasutaka Kawakami
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Publication number: 20100011895Abstract: In a gear (G1) according to the present invention, which is provided with a plurality of teeth (1) to be mated with teeth of a mating gear to thereby transmit a rotational motion, a predetermined region (A) in at least one tooth flank (7) of each tooth (1) is formed in a configuration such that, from at least one place in a tooth width direction on a crossing (8) of the tooth flank (7) and a tooth tip surface (3), the mating with the teeth of the mating gear is started with the point contact or the line contact shorter than the total tooth width, and thereafter, is gradually shifted to the line contact so that the length of contact line (10) thereof is sequentially increased as the line contact moves from a tooth tip surface (3) side toward a tooth root side.Type: ApplicationFiled: September 25, 2009Publication date: January 21, 2010Applicant: ENPLAS CORPORATIONInventors: Kenji OHMI, Yasutaka Kawakami
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Publication number: 20070137355Abstract: In a gear G1 according to the present invention, which is provided with a plurality of teeth 1 to be mated with teeth of a mating gear to thereby transmit a rotational motion, a predetermined region A in at least one tooth flank 7 of each tooth 1 is formed in a configuration such that, from at least one place in a tooth width direction on a crossing 8 of the tooth flank 7 and a tooth tip surface 3, the mating with the teeth of the mating gear is started with the point contact or the line contact shorter than the total tooth width, and thereafter, is gradually shifted to the line contact so that the length of contact line 10 thereof is sequentially increased as the line contact moves from a tooth tip surface 3 side toward a tooth root side.Type: ApplicationFiled: September 28, 2006Publication date: June 21, 2007Applicant: Enplas CorporationInventors: Kenji Ohmi, Yasutaka Kawakami