Sprocket assembly

The sprocket assembly addresses misalignment issues in bicycle chainring assemblies by using alignment elements to securely attach and align sprockets, enhancing performance and reducing maintenance through precise, lightweight, and uncomplicated design.

DE102018009525B4Active Publication Date: 2026-06-03SRAM LLC
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Patent Information

Application Number
DE102018009525
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2017-12-20
Filing Date
2018-12-04
Publication Date
2026-06-03
Estimated Expiration
2038-12-04

AI Technical Summary

Technical Problem

Existing bicycle chainring assemblies suffer from misalignment issues, leading to shifting difficulties, chain derailment, and premature wear, and there is a need for a lightweight, uncomplicated, and effectively aligned sprocket assembly.

Method used

A sprocket assembly design featuring a first sprocket with external mounting elements and internal second sprocket, aligned using alignment elements that engage through openings in both sprockets and a carrier, ensuring precise alignment and attachment without complex threading.

Benefits of technology

The design enhances bicycle performance by reducing maintenance needs, improving shifting accuracy, and maintaining consistent gear ratios through robust, lightweight, and simplified sprocket alignment.

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Abstract

Sprocket assembly (40) for a bicycle (10), wherein the sprocket assembly (40) comprises: a first chain wheel (52) configured to rotate about an axis of rotation (L) of the bicycle (10); a mounting element (60) comprising a plurality of engagement elements (128) which are fixed in relation to it on associated, interconnected mounting arms (122) of the mounting element (60) and are arranged on the outside of the first sprocket (52); a second sprocket (54) arranged on the inside of the first sprocket (52); and a plurality of alignment elements (58) which engage with the plurality of engagement elements (128) through a plurality of first openings (64) in the first sprocket (52) and a plurality of second openings (80) in the second sprocket (54); wherein each of the plurality of alignment elements (58) comprises an alignment feature configured to engage directly radially with each of the plurality of first openings (64) and the plurality of second openings (80); and wherein the sprocket assembly (40) further comprises a carrier (56) arranged between the first and second sprockets (52, 54), wherein the carrier (56) comprises a plurality of third openings (88), and wherein the plurality of third openings (88) is configured to engage directly radially with the alignment feature of each of the plurality of alignment elements (58).
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Citation Information

Patent Citations

  • Bicycle chain wheel, has fastener cover structure overlying on external section of fastener for hiding fastener during examining external surface side of chain ring mounting structure, where fastener is coupled at ring mounting opening

    DE102007046301A1

  • Bicycle front sprocket mounting element, bicycle front sprocket and bicycle crank assembly

    DE202014104837U1

  • Bicycle crankset with two chainrings

    US20080207369A1

  • Bicycle crank assembly

    US20130087012A1

  • Right crank arm assembly for a bicycle

    US20130233127A1