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公开(公告)号：US10138991B2
公开(公告)日：2018-11-27
申请号：US15265808
申请日：2016-09-14
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga
Abstract: A bicycle sprocket comprises a sprocket body, a shifting facilitation area, and a plurality of chain-driving teeth. The plurality of chain-driving teeth comprises a reference tooth and a first tooth. The reference tooth has a reference radial length defined radially outward from a root circle of the bicycle sprocket. The first tooth has a first radial length defined radially outward from the root circle of the bicycle sprocket. The first radial length is larger than the reference radial length. The first tooth is adjacent to the reference tooth in a circumferential direction defined about the rotational center axis without another tooth between the first tooth and the reference tooth. The first tooth is provided on a downstream side of the reference tooth in a driving rotational direction in which the bicycle sprocket is rotated about the rotational center axis during pedaling.
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公开(公告)号：US09926038B2
公开(公告)日：2018-03-27
申请号：US14811781
申请日：2015-07-28
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga , Tsuyoshi Fukumori , Koji Tokuyama , Sota Yamaguchi , Toshinari Oishi
CPC classification number: B62M9/10 , F16H55/303
Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, and at least one chain-curvature limiting protuberance. The sprocket body is configured to be rotatable about a rotational center axis. The plurality of sprocket teeth extend radially outward from an outer periphery of the sprocket body. The at least one chain-curvature limiting protuberance is configured to limit axial curvature of a bicycle chain engaging with an independent neighboring bicycle sprocket which is adjacent to the bicycle sprocket without another sprocket between the bicycle sprocket and the independent neighboring bicycle sprocket. The axial curvature is curvature of the bicycle chain relative to the bicycle sprocket when viewed from a radial direction perpendicular to the rotational center axis. The at least one chain-curvature limiting protuberance is disposed on at least one of an outward facing side and an inward facing side.
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公开(公告)号：US10800487B2
公开(公告)日：2020-10-13
申请号：US15989162
申请日：2018-05-24
Applicant: SHIMANO INC.
Inventor： Atsuhiro Emura , Yasufumi Fukunaga , Tsuyoshi Fukumori
Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, and at least one upshifting facilitation area. The plurality of sprocket teeth extends radially outwardly from the sprocket body with respect to the rotational center axis. The plurality of sprocket teeth includes at least one axially recessed upshifting initiation tooth. The at least one axially recessed upshifting initiation tooth includes a driving surface, a non-driving surface and a tooth tip portion. The non-driving surface includes a non-driving surface protrusion disposed radially inwardly from a non-driving surface side tooth tip end with respect to a rotational center axis. The non-driving surface protrusion has a protrusion tip disposed closer to the second axially-facing surface than the non-driving-surface-side tooth tip end in the axial direction so that a guiding slope extends from the protrusion tip toward the first axially-facing surface.
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公开(公告)号：US09915336B1
公开(公告)日：2018-03-13
申请号：US15265814
申请日：2016-09-14
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga
Abstract: A bicycle sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket comprises a first sprocket body, a first shifting facilitation area, a plurality of first chain-driving teeth, and a first outer diameter. The second sprocket comprises a second sprocket body, a plurality of second chain-driving teeth, a second outer diameter, and a support protuberance. The support protuberance protrudes from the second sprocket body toward the first sprocket. The support protuberance is provided in a circumferential support area on the second sprocket. The circumferential support area is configured to face a circumferential area on the first sprocket in an axial direction. The circumferential area extends from a third tooth to a fifth tooth in a circumferential direction with respect to a rotational center axis.
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公开(公告)号：US11718369B2
公开(公告)日：2023-08-08
申请号：US17964037
申请日：2022-10-12
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga , Shota Suyama
Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, and a torque transmitting profile. The sprocket body has an outer periphery and an inner periphery positioned radially inwardly from the outer periphery with respect to a rotational center axis of the bicycle sprocket. The plurality of sprocket teeth is disposed on the outer periphery of the sprocket body. The torque transmitting profile is positioned around the inner periphery of the sprocket body. The torque transmitting profile includes at least ten internal spline teeth. The at least ten internal spline-teeth include at least one first internal spline-tooth, at least one second internal spline-tooth and at least one third internal spline-tooth. The at least one internal first spline-tooth, the at least one second internal spline-tooth and the at least one third internal spline-tooth are different in shape from each other.
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Patent Agency Ranking
公开(公告)号：US11518474B2
公开(公告)日：2022-12-06
申请号：US16255826
申请日：2019-01-24
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga , Shota Suyama
Abstract: A bicycle sprocket arrangement comprises a smaller sprocket and a larger sprocket. The larger sprocket has at least one upshifting facilitation area configured to facilitate an upshifting operation in which a bicycle chain is shifted from the larger sprocket toward the smaller sprocket. The at least one upshifting facilitation area includes an upstream tooth, an intermediate tooth, and a downstream tooth. The upstream tooth has a first recessed portion. The intermediate tooth has a second recessed portion. The downstream tooth has at least one of a third recessed portion and a chamfered portion. The at least one of the third recessed portion and the chamfered portion are separated from the second recessed portion.
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公开(公告)号：US11338886B2
公开(公告)日：2022-05-24
申请号：US15989159
申请日：2018-05-24
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga , Atsuhiro Emura
Abstract: A bicycle multiple sprocket comprises a plurality of sprockets. The plurality of sprockets includes a first sprocket and a second sprocket. The second sprocket includes a second sprocket body and a plurality of second sprocket teeth extending radially outwardly from the second sprocket body with respect to the rotational center axis. The plurality of second sprocket teeth includes at least one chain-curvature limiting tooth having a chain-curvature limiting surface configured to support an inner link plate of a bicycle chain in the axial direction in a chain-inclining state where the bicycle chain is inclined from the at least one chain-curvature limiting tooth toward the first sprocket so as to prevent one of a plurality of first sprocket teeth from engaging in an outer link space provided between an opposed pair of outer link plates of the bicycle chain.
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公开(公告)号：US11338887B2
公开(公告)日：2022-05-24
申请号：US16282239
申请日：2019-02-21
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga , Atsuhiro Emura , Kohei Hokai
Abstract: A bicycle rear sprocket comprises a sprocket body and a plurality of sprocket teeth including a plurality of driving-noise reduction teeth. Each of the plurality of driving-noise reduction teeth comprises an upstream circumferential surface, a downstream circumferential surface, a first chamfer, and a second chamfer. The first chamfer has a first borderline relative to the bicycle outward surface. The second chamfer has a second borderline relative to the bicycle outward surface. A first opposite end of the first borderline and a second opposite end of the second borderline are disposed radially outwardly from each of a first end of the first borderline and a second end of the second borderline with respect to the rotational center axis. A total number of the plurality of driving-noise reduction teeth is equal to or larger than one-third of a total tooth-space number of the plurality of sprocket teeth.
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公开(公告)号：US10933947B2
公开(公告)日：2021-03-02
申请号：US15705471
申请日：2017-09-15
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga
Abstract: A bicycle sprocket comprises a sprocket body and a plurality of sprocket teeth including at least one first tooth to initially disengage with the bicycle chain in a shifting operation where the bicycle chain shifts from the bicycle sprocket to an adjacent smaller bicycle sprocket. At least one second tooth is disposed adjacent to the at least one first tooth at an upstream side of the at least one first tooth in a driving rotational direction of the bicycle sprocket. The at least one second tooth has a first tooth height. At least one third tooth is disposed adjacent to the at least one second tooth at the upstream side of the at least one second tooth. The at least one third tooth has a second tooth height longer than the first tooth height.
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公开(公告)号：US10717495B2
公开(公告)日：2020-07-21
申请号：US15705432
申请日：2017-09-15
Applicant: SHIMANO INC.
Inventor： Yasufumi Fukunaga , Hiroshi Fujita , Tsuyoshi Fukumori , Atsuhiro Emura
Abstract: A bicycle sprocket comprises a sprocket body, a plurality of sprocket teeth, an axially outward protuberance, and an axially inward protuberance. The axially outward protuberance is disposed on an outward facing side of the sprocket body to overlap at least partly with a bicycle chain engaging with a neighboring bicycle sprocket when viewed along a rotational center axis. The axially inward protuberance is disposed on an inward facing side of the sprocket body to overlap at least partly with the axially outward protuberance when viewed along the rotational center axis.
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