To provide a human-powered vehicle rear sprocket that can reliably bring a driving chain into engagement with down-shift start teeth during down-shift operation.SOLUTION: An eighth rear sprocket 48 of a bicycle 1 includes a plurality of sprocket teeth 52. The plurality of sprocket teeth 52 include a plurality of down-shift promoting teeth 53. The plurality of down-shift promoting teeth 53 include down-shift recessed teeth 55 and down-shift start teeth 56. The down-shift recessed teeth 55 each include a down-shift recessed portion 59 and a protruding portion 60. The down-shift recessed portion 59 reaches a recessed tooth non-drive surface 58 of the down-shift recessed tooth 55. The protruding portion 60 is at least partially disposed on a radially outward side of the down-shift recessed portion 59. A driving chain 3 is first brought into engagement with the down-shift start tooth 56.SELECTED DRAWING: Figure 6
【課題】ダウンシフト動作中に駆動チェーンをダウンシフト開始歯に確実に係合することができる人力駆動車両のリアスプロケットが、提供される。【解決手段】自転車1の第8のリアスプロケット48は、複数のスプロケット歯52を備える。複数のスプロケット歯52は複数のダウンシフト促進歯53を有する。複数のダウンシフト促進歯53は、ダウンシフト凹部歯55と、ダウンシフト開始歯56と、を有する。ダウンシフト凹部歯55は、ダウンシフト凹部59と、突出部60と、を有する。ダウンシフト凹部59は、ダウンシフト凹部歯55の凹部歯非駆動面58に到達する。突出部60は、ダウンシフト凹部59より径方向外側に少なくとも部分的に配置される。駆動チェーン3はダウンシフト開始歯56に最初に係合する。【選択図】図6
HUMAN-POWERED VEHICLE REAR SPROCKET
人力駆動車両のリアスプロケット
2024-04-10
Patent
Electronic Resource
Japanese
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