Patent ID: 11919606
Assignee: SRAM DEUTSCHLAND GMBH
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B

Claim 0:
1. A bicycle rear-wheel sprocket pairing for engaging in a force-transmitting manner with a bicycle roller chain and rotatable about a sprocket axis, wherein the sprocket axis defines an axial direction running along the sprocket axis, a radial direction running so as to be orthogonal to the sprocket axis, and a circumferential direction encircling the sprocket axis, the rear-wheel sprocket pairing comprising:
a larger sprocket; and
a smaller sprocket which for rotating conjointly with the larger sprocket in a slip-free manner about the sprocket axis is connected to the larger sprocket so as to be coaxial with and axially directly adjacent to the latter, wherein the larger sprocket has an even tooth count of equal to or less than twenty-two teeth, and wherein the difference in the tooth count between the larger and the smaller sprocket is exactly two teeth,
wherein the larger sprocket in an end side thereof that faces the smaller sprocket, along a portion of the circumference of the larger sprocket has an upshift region having an upshift recess formation, wherein the upshift region, when axially viewing the rear-wheel sprocket pairing in a relative state in which the smaller sprocket lies closer to the observer than the larger sprocket, is configured and disposed so as to permit on the rear-wheel sprocket pairing rotating in the clockwise direction about the sprocket axis a change of engagement of the bicycle roller chain from the larger to the smaller sprocket,
wherein on the larger sprocket the upshift recess formation is assigned only exactly one release tooth which by way of the design and orientation thereof, when interacting with the upshift recess formation during an upshift procedure from the larger sprocket to the smaller sprocket, is configured to be the last tooth that engages between a link plate pair of a chain link of the bicycle roller chain,, and
wherein the larger sprocket in the end side thereof that faces the smaller sprocket, along the circumference of the larger sprocket has a downshift region having a downshift recess formation, wherein the downshift region, when axially viewing the rear-wheel sprocket pairing in the relative state, is configured so as to permit on the rear-wheel sprocket pairing rotating in the clockwise direction about the sprocket axis a change of engagement of the bicycle roller chain from the smaller to the larger sprocket, wherein on the larger sprocket the downshift recess formation is assigned only exactly one catch tooth which by way of the design and orientation thereof, when interacting with the downshift recess formation during a downshift procedure from the smaller sprocket to the larger sprocket, is configured to be the first tooth that engages between link plates of a chain link of the bicycle roller chain.