Shift assist projection for bicycle sprocket

A protruding part and auxiliary part technology, applied in the field of gear shift auxiliary protruding parts, can solve the problems of inability to shift operation, unsatisfactory feeling of the cyclist, stability, etc.

Inactive Publication Date: 2005-12-28
SHIMANO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, with this sprocket assembly, the shifting action is not always as stable as some cyclists would like
In other words, using this sprocket assembly still leaves some riders feeling unsatisfied

Method used

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  • Shift assist projection for bicycle sprocket
  • Shift assist projection for bicycle sprocket
  • Shift assist projection for bicycle sprocket

Examples

Experimental program
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Effect test

no. 2 example

[0066] see now Figure 22 , the bicycle drive train 210 with the front crankset 212 according to the second embodiment will now be described. In addition to the sprocket S in the first embodiment 1 by a pair of sprockets S 1A and S 1B Except for substitutions, this second embodiment is the same as the first embodiment. In view of the similarity between the first and second embodiments, parts of the second embodiment that are identical to parts of the first embodiment will be given the same reference numerals. Also, descriptions of the parts of the second embodiment that are the same as those of the first embodiment may be omitted for the sake of brevity.

[0067] In this embodiment, the large sprocket S 2 and intermediate sprocket S 1B Both have a shift assist projection (not shown) as in the first embodiment. except intermediate sprocket S 1B with multiple protrusions (not shown) and similar to the large sprocket S 2 Except for the upshift teeth (not shown), the inte...

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PUM

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Abstract

A shift assist projection is provided on a large bicycle sprocket to facilitate chain movement from an adjacent smaller sprocket to that sprocket. A shift assist projection extends axially from one side of the sprocket. The shift assist projection has an axially oriented chain capture face facing the center face and the teeth of the large sprocket for engagement with the outer link plates of the bicycle chain. Preferably, the angle of the chain capture face relative to the center plane of the large sprocket is variable. Preferably, when the chain is moving from the smaller sprocket to the larger sprocket, the most rearwardly turned edge of the chain catch surface is located closer to the position of the most forward turned edge than is the position of the most forwardly turned edge, viewed substantially along the direction of chain motion of the chain center plane.

Description

technical field [0001] The present invention generally relates to a shift assist lug for a bicycle sprocket. More particularly, the present invention relates to a sprocket assembly having one or more shift assist projections formed on the larger sprocket that facilitate movement of the bicycle chain from the smaller sprocket to the larger sprocket . Background technique [0002] Cycling is becoming an increasingly popular form of recreation as well as a mode of transportation. Moreover, cycling has become a very popular competitive sport among both amateurs and professionals. Whether the bicycle is used for recreation, transportation or competition, the bicycle industry is constantly improving the various components of the bicycle. In particular, various components of bicycle drive trains have been extensively redesigned in recent years in order to improve shifting performance and stability. [0003] Typically, the drive train includes one or more front sprockets coupled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62M9/06B62M9/131
CPCB62M9/06B62M9/105
Inventor 江村笃裕西本祐辅手塚俊雄
Owner SHIMANO INC
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