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US 11,767,079 B2Granted
Sprocket for a bicycle drive train
AssigneeSRAM Deutschland GmbH
InventorPeter Geist
Life of this patent
Estimating the term…
Abstract
A sprocket for a bicycle drive train comprising an outer ring having external teeth for engaging in a bicycle chain, and an inner ring coaxially disposed with the outer ring and is connected to the outer ring in a rotationally fixed manner. The inner ring has a central opening. A circumferential collar is configured to be integral with the inner ring and projects axially to one side of the inner ring and is configured as a continuous collar. An internal profile having a plurality of radially inward-projecting radial protrusions is provided on the radially inner side of the collar, and an external profile having a plurality of radial depressions, which in number and arrangement correspond to the radial protrusions of the internal profile, is provided on the radially outer side of the collar.
Claims11
A sprocket for a bicycle drive train, comprising:
- an outer ring having external teeth for engaging in a bicycle chain;
- an inner ring disposed coaxially with the outer ring, the inner ring connected to the outer ring in a rotationally fixed manner and has a central opening;
- a circumferential collar configured to be integral with the inner ring and projecting axially to one side of the inner ring, the circumferential collar configured as a continuous collar;
- and
- the circumferential collar having an internal profile having a plurality of radially inward-projecting radial protrusions provided on a radially inner side of the circumferential collar, the circumferential collar having an external profile having a plurality of radial depressions provided on a radially outer side of the circumferential collar, the plurality of radial depressions corresponding to the plurality of radially inward-projecting radial protrusions in number and arrangement around the circumferential collar,
- each of the radially inward-projecting radial protrusions of the internal profile having a first flank which is arranged so as to lead with respect to a predetermined rotation direction about a central axis of the sprocket, and a second flank which is arranged so as to trail with respect to the predetermined rotation direction, wherein for at least one of the radially inward-projecting radial projections, the first flank and the second flank are not mirror-symmetrically with respect to one another.
3 more elements
A sprocket for a bicycle drive train, comprising:
- an outer-ring having external teeth for engaging in a bicycle chain;
- an inner ring disposed coaxially with the outer ring, the inner ring connected to the outer ring in a rotationally fixed manner and has a central opening;
- a circumferential collar configured to be integral with the inner ring and projecting axially to one side of the inner ring, the circumferential collar configured as a continuous collar;
- and
- the circumferential collar having an internal profile having a plurality of radially inward-projecting radial protrusions provided on a radially inner side of the circumferential collar, the circumferential collar having an external profile having a plurality of radial depressions provided on a radially outer side of the circumferential collar, the plurality of radial depressions corresponding to the plurality of radially inward-projecting radial protrusions in number and arrangement around the circumferential collar,
- wherein an axial end face of the circumferential collar is axially disposed between a center plane of the inner ring and a center plane of the external teeth for engaging in the bicycle chain or a center plane of the outer ring.
3 more elements
A sprocket cassette for a bicycle drive train, comprising:
- a sprocket set having a plurality of coaxially arranged, axially spaced-apart and non-rotatably interconnected sprockets of different diameters, wherein one of the plurality of sprockets is a terminating sprocket which is configured for transmitting torque directly to a driver on a rear wheel hub of a bicycle, the terminating sprocket comprising:
- an outer ring having external teeth for engaging in a bicycle chain;
- an inner ring disposed coaxially with the outer ring, the inner ring connected to the outer ring in a rotationally fixed manner and has a central opening;
- and
- a circumferential collar configured to be integral with the inner ring and projecting axially to one side of the inner ring, the circumferential collar configured as a continuous collar,
- the circumferential collar having an internal profile having a plurality of radially inward-projecting radial protrusions provided on a radially inner side of the circumferential collar, the circumferential collar having an external profile having a plurality of radial depressions provided on a radially outer side of the circumferential collar, the plurality of radial depressions corresponding to the plurality of radially inward-projecting radial protrusions in number and arrangement around the circumferential collar,
- wherein an axial end face of the circumferential collar is axially disposed between a center plane of the inner ring and a center plane of the external teeth for engaging in the bicycle chain or a center plane of the outer ring.
4 more elements
A method for producing a sprocket for a bicycle drive train, comprising the following steps:
- i) punching a sprocket blank having a central provisional hole,
- ii) further processing the sprocket blank to form a sprocket having a central opening, an inner ring, and a circumferential collar integral with and projecting axially to one side of the inner ring,
- wherein step ii) comprises at least the following step:
- a) forming the sprocket blank, wherein a punch is pushed through the provisional hole of the sprocket blank into a die to form the circumferential collar,
- wherein the forming in step a) forms an internal profile having a plurality of radially inward-projecting radial protrusions on a radially inner side of the circumferential collar, and an external profile having a plurality of radial depressions corresponding in number and arrangement to the plurality of radially inward-projecting radial projections on the internal profile on a radially outer side of the circumferential collar.
2 more elements
Dependencies are inferred from the claim text.