Motion transmission system of a bicycle
AssigneeCampagnolo S.r.l.
InventorMaurizio Valle
Life of this patent
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Abstract
A sprocket assembly defining a sprocket assembly width. The assembly has at least eleven sprockets and the sprocket assembly mounts to a bicycle freewheel hub that rotates about a rotation axis which defines a predetermined axial distance on the hub between a plane that is substantially perpendicular to the rotation axis. At least one point of the attachment seats for spokes closest to the freewheel body and a plane is substantially perpendicular to the rotation axis and defined in the fastening portion to the frame. The sprocket assembly width is lower than or equal to the predetermined axial distance. A chain that engages the sprockets has a maximum thickness in the direction of the rotation axis between and including 4.6 mm and 5.8 mm.
Claims23
A bicycle freewheel body and sprocket assembly wherein:
- the freewheel body has a predetermined axial width, an outer surface that is configured to mate with one or more sprockets of the sprocket assembly, and an internal surface selected to mate with a hub associated with a bicycle rear wheel;
- and,
- the sprocket assembly has eleven sprockets of various diameters that are arranged on the freewheel body with a largest diameter sprocket and a smallest diameter sprocket forming end sprockets of the sprocket assembly, each of the end sprockets has an outer face and the respective outer face of each end sprocket faces in an opposite directions and the outer faces are spaced from each other along the freewheel body predetermined axial width by a distance that is no greater than 42.5 mm;
- an assembly of at least eleven sprockets, that has an overall axial width, measured between respective outer faces of end sprockets in the assembly, that is no greater than 40.5 mm;
- and,
- a chain comprised of an alternating succession of inner and outer links, connected to each other at respective connection ends,
- each of the links comprising inner and outer plates that are arranged parallel to each other, the two plates of both the outer links and the inner links being spaced apart from each other to define between the two plates a void space that receives at least one tooth of at least one of the sprockets.
A motion transmission system including a sprocket assembly of at least eleven sprockets defining a sprocket assembly width between respective outer faces of end sprockets of the sprocket assembly, wherein the sprocket assembly mounts to a hub that rotates about a rotation axis and a predetermined axial distance being defined on the hub between a first plane, substantially perpendicular to the rotation axis, comprising at least one point of attachment seats for spokes closest to a freewheel body of the hub, and a second plane, substantially perpendicular to the rotation axis and defined at a frame attachment portion,
- wherein the sprocket assembly width is less than, or equal to, the predetermined axial distance, and
- wherein a chain that engages the sprockets has a maximum thickness in a direction of the rotation axis between and including 4.6 mm and 5.8 mm,
- wherein the chain comprises an alternating succession of outer and inner links, connected to each other at respective connection ends, each of the links comprising two respective plates arranged parallel to each other, the two plates of both the outer links and the inner links being spaced apart from each other to define between the two plates a void space that receives a tooth of a sprocket,
- wherein the sprocket assembly width is no greater than 40.5 mm,
- wherein a distance between consecutive sprockets of the sprocket assembly is greater than or equal to a thickness of the sprockets.
A motion transmission system including a sprocket assembly of at least eleven sprockets defining a sprocket assembly width defined between respective outer faces of end sprockets of the sprocket assembly, wherein the sprocket assembly mounts to a hub that has a predetermined axial distance defined on the hub between a first plane, perpendicular to a rotation axis, comprising at least one point of attachment seats for spokes closest to a freewheel body of the hub, and a second plane, perpendicular to the rotation axis and defined at a frame attachment portion,
- wherein the sprocket assembly width is less than, or equal to, the predetermined axial distance,
- wherein a chain that engages the sprockets has a maximum thickness in a direction of the rotation axis between and including 4.6 mm and 5.8 mm,
- wherein the chain comprises an alternating succession of outer and inner links, connected to each other at respective connection ends, each of the links comprising two respective plates arranged parallel to each other, the two plates of both the outer links and the inner links being spaced apart from each other to define between the two plates a void space that receives a tooth of a sprocket,
- wherein the sprocket assembly width is no greater than 40.5 mm,
- wherein a distance between consecutive sprockets of the sprocket assembly is greater than or equal to a thickness of the sprockets,
- wherein the sprockets have a maximum thickness, at an engagement area with the chain, no greater than 1.7 mm.
A motion transmission system including a sprocket assembly of at least eleven sprockets defining a sprocket assembly width defined between respective outer faces of end sprockets of the sprocket assembly, wherein the sprocket assembly mounts to a hub that rotates about a rotation axis and a predetermined axial distance being defined on the hub between a first plane, substantially perpendicular to the rotation axis, comprising at least one point of attachment seats for spokes closest to a freewheel body of the hub, and a second plane, substantially perpendicular to the rotation axis and defined at a frame attachment portion,
- wherein the motion transmission system includes a sprocket engagement chain comprised of alternating outer and inner links, connected to each other at respective connection ends, each of the links comprising two respective plates, arranged parallel to each other, the two plates of both the outer links and the inner links being spaced apart from each other to define between the two plates a void space that receives a tooth associated with an engaged sprocket,
- wherein the sprocket assembly width is less than, or equal to, the predetermined axial distance, and
- wherein the sprocket assembly width is no greater than 40.5 mm,
- wherein at least six consecutive sprockets have a number of teeth that differs by one from that of at least one adjacent sprocket.
Dependencies are inferred from the claim text.