Bicycle sprocket

Patent metadata

Field	Value
Publication number	US-11845514-B2
Application number	US-202117539118-A
Country	US
Kind code	B2
Filing date	Nov 30, 2021
Priority date	Nov 30, 2020
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A bicycle sprocket for a sprocket cassette comprises a sprocket main body which extends about a virtual sprocket axis about which the sprocket is rotatable during intended operation on a bicycle. In the case of a single release tooth being formed, a release-side stabilizing tooth is arranged in the circumferential region of extent of an upshift recess formation. The release-side stabilizing tooth has an inner tooth contact surface which has a greater axial spacing to an axial reference position than an inner tooth contact surface of the reference tooth. Additionally, or alternatively, in the case of a single catch tooth being formed, a receiving-side stabilizing tooth is arranged in the circumferential region of extent of a downshift recess formation. The receiving-side stabilizing tooth has an inner tooth contact surface which has a greater axial spacing to the axial reference position than the inner tooth contact surface of the reference tooth.

First claim

What is claimed is:

1. A bicycle sprocket for a sprocket cassette, the bicycle sprocket comprising:
a sprocket main body extending about a virtual sprocket axis about which the sprocket is rotatable during intended operation on a bicycle, the sprocket axis defining an axial direction, radial directions orthogonal with respect thereto, and a circumferential direction encircling the axial direction; and
a plurality of sprocket teeth for engaging with a bicycle roller chain having inner link plate chain links and outer link plate chain links alternating along a circulating path of the bicycle roller chain, the plurality of sprocket teeth spaced apart from one another and arranged in the circumferential direction,
wherein the sprocket is designed to be arranged on a bicycle such that an axially outwardly facing outer side surface of the sprocket rotates clockwise as seen in an axial plan view of the outer side surface during forward travel, driven by the sprocket, of the bicycle, and such that an axially inwardly facing inner side surface, which is situated opposite the outer side surface, rotates counterclockwise as seen in an axial plan view of the inner side surface,
wherein the plurality of sprocket teeth protrude radially outwardly from the sprocket main body, the plurality of sprocket teeth each having one axially outwardly facing outer tooth contact surface, which is designed for abutting engagement with an inner surface of a first chain link plate, and an axially inwardly facing inner tooth contact surface, which is designed for abutting engagement with an inner surface of a second chain link plate which is situated axially opposite the first chain link plate,
wherein the sprocket has, along a section of its circumference in the region of the sprocket main body and of the sprocket teeth, an upshift region with an axial upshift recess formation in its outer side surface, the upshift region is designed and arranged to allow, on the sprocket rotating in the drive direction of rotation about the sprocket axis, a changeover of engagement of the bicycle roller chain from the sprocket to a smaller sprocket situated on the side of the outer side surface, wherein the upshift recess formation is assigned at least one release tooth which, by way of its design, the location of its arrangement and its orientation, is designed to, in interaction with the upshift recess formation during an upshift operation, be a final tooth of the sprocket that engages between inner surfaces, which face towards one another, of a link plate pair of a chain link of the bicycle roller chain and/or
wherein the sprocket has, along a section of its circumference in the region of the sprocket main body and of the sprocket teeth, a downshift region with an axial downshift recess formation in its outer side surface, wherein the downshift region is designed and arranged to allow, on the sprocket rotating in the drive direction of rotation about the sprocket axis, a changeover of engagement of the bicycle roller chain from a smaller sprocket situated on the side of the outer side surface to the sprocket, wherein the downshift recess formation is assigned at least one catch tooth which, by way of its design, the location of its arrangement and its orientation, is designed to, in interaction with the downshift recess formation during a downshift operation, be a first tooth of the sprocket that engages between inner surfaces, which face towards one another, of a link plate pair of a chain link of the bicycle roller chain,
wherein the sprocket has a plurality of inner link plate sprocket teeth that are each designed, owing to their axial dimensions, for engagement with an inner link plate chain link of the bicycle roller chain,
wherein the sprocket has at least one reference tooth which, among the inner link plate sprocket teeth, is the at least one sprocket tooth with the largest axial chain-guiding dimension, wherein the reference tooth has an outer tooth contact surface, situated outside a recess formation, as an outer tooth contact reference surface, wherein the outer tooth contact reference surface defines an axial reference position,
wherein a release-side stabilizing tooth is arranged in the circumferential region of extent of the upshift recess formation, wherein the release-side stabilizing tooth has an inner tooth contact surface which has a greater axial spacing to the axial reference position than an inner tooth contact surface of the reference tooth, and/or wherein a receiving-side stabilizing tooth is arranged in the circumferential region of extent of the downshift recess formation, wherein the receiving-side stabilizing tooth has an inner tooth contact surface which has a greater axial spacing to the axial reference position than the inner tooth contact surface of the reference tooth.

2. A bicycle sprocket according to claim 1 , wherein the release-side stabilizing tooth is directly adjacent to the at least one release tooth counter to the drive direction of rotation and/or in that the receiving-side stabilizing tooth is directly adjacent to the at least one catch tooth in the drive direction of rotation.

3. A bicycle sprocket according to claim 1 , wherein an outer tooth contact surface of the release-side stabilizing tooth is offset inwardly with respect to the axial reference position and has a greater axial spacing to the axial reference position than an outer tooth contact surface of the at least one release tooth, and/or in that an outer tooth contact surface of the receiving-side stabilizing tooth is offset inwardly with respect to the axial reference position and has a greater axial spacing to the axial reference position than an outer tooth contact surface of the at least one catch tooth.

4. A bicycle sprocket according to claim 1 , wherein the inner tooth contact surface of the release-side stabilizing tooth has a greater axial spacing to the axial reference position than an inner tooth contact surface of the at least one release tooth, and/or the inner tooth contact surface of the receiving-side stabilizing tooth has a greater axial spacing to the axial reference position than an inner tooth contact surface of the at least one catch tooth.

5. A bicycle sprocket according to claim 1 , wherein the release-side mobilizing tooth is arranged directly adjacent to the at least one release tooth in the drive direction of rotation, wherein the axial spacing of an inner tooth contact surface of the release-side mobilizing tooth to the axial reference position is less than or equal to the axial spacing of the inner tooth contact surface of the reference tooth to the axial reference position and less than the axial spacing of the inner tooth contact surface of the release-side stabilizing tooth to the axial reference position, and/or wherein the receiving-side mobilizing tooth is arranged directly adjacent to the at least one catch tooth counter to the drive direction of rotation, wherein the axial spacing of an inner tooth contact surface of the receiving-side mobilizing tooth to the axial reference position is less than or equal to the axial spacing of the inner tooth contact surface of the reference tooth to the axial reference position and less than the axial spacing of the inner tooth contact surface of the receiving-side stabilizing tooth to the axial reference position.

6. A bicycle sprocket according to claim 5 , wherein the axial spacing of the inner tooth contact surface of the release-side mobilizing tooth to the axial reference position is less than the axial spacing of the inner tooth contact surface of the reference tooth to the axial reference position, and/or in that the axial spacing of the inner tooth contact surface of the receiving-side mobilizing tooth to the axial reference position is less than the axial spacing of t

Assignees

• Sram De Gmbh

Inventors

• Buechner Sven
• Buettner Alex
• Heyna Sebastian
• Kommer Pierre
• Puls Arndt
• Rohmer Jakob
• Vonend Andreas

Classifications

• B62M9/04

  of changeable ratio · CPC title

• B62M9/10 Primary

  involving different-sized wheels, {e.g. rear sprocket chain wheels} selectively engaged by the chain, belt, or the like {(bicycle hubs rotatably arranged on axle B60B27/023)} · CPC title

• B62M9/12 Primary

  the chain, belt, or the like being laterally shiftable {, e.g. using a rear derailleur} · CPC title