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Bicycle crank assembly

A technology for bicycles and components, applied in vehicle components, crank structures, vehicle gearboxes, etc., can solve problems such as contact, regardless of the structure of crank components

Active Publication Date: 2016-12-28
SHIMANO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if you just increase the width of the rear end to fit a wider tire to the rear end regardless of the configuration of the crankset, the chain may come into contact with the chainstay

Method used

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  • Bicycle crank assembly
  • Bicycle crank assembly
  • Bicycle crank assembly

Examples

Experimental program
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Embodiment approach

[0035] Such as figure 1 Shown, bicycle 1 comprises vehicle frame 11, handlebar 13, front hub assembly 15, front wheel 17, rear wheel 19, front braking device 21, rear braking device 23, speed change part 30 and driving part 25 (comprising crank assembly 27 and rear hub assembly 29).

[0036] The frame 11 includes a frame body 11a and a front fork 11b. The frame body 11a includes a top tube 11c, a head tube 11d, a seat tube 11e, a down tube 11f, a pair of chain stays 11g, a pair of seat stays 11h and a bottom bracket 12 (see figure 2 with 3 ). The connecting portion of the seat stay 11h and the chain stay 11g will be described below as a rear end 11j.

[0037] The front fork 11b is rotatably attached to the head pipe 11d of the frame body 11a. The handlebar 13 is fixed to the front fork 11b.

[0038] The front hub assembly 15 is supported on the front fork 11b. The front wheel 17 and the rear wheel 19 are rotatably attached to the front fork 11 b and the rear portion of...

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PUM

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Abstract

A bicycle crank assembly has a sprocket, a first crank arm(27a), a second crank arm(27b) and a crank axle(51). A first axial distance(D1) is defined between the first pedal attachment surface(S1) and the second pedal attachment surface(S2) in an axial direction. A second axial distance(D2) is defined between the first transverse center plane(A1) of the sprocket(36) and the second axial center plane(A2) of the crank axle(51) in the axial direction. The first axial distance(D1) is smaller than or equal to 170 mm. The second axial distance(D2) is larger than or equal to 55 mm.

Description

technical field [0001] The technology disclosed herein relates to bicycle crank assemblies. Background technique [0002] In conventional bicycles, wide tires can be attached to the bicycle frame according to the needs of the user. When a user tries to attach a wide tire to the rear end of the frame, the upper limit of the width of the wide tire is determined by the width of the rear end. [0003] However, if you simply increase the width of the rear end to fit a wider tire to the rear end without regard to the configuration of the crankset, the chain may come into contact with the chainstay. In other words, the construction of the crankset is critical for fitting wider tires to the rear end. [0004] In view of this problem, an object of the present invention is to provide a bicycle crank assembly capable of properly mounting a wider tire to a frame. Contents of the invention [0005] (1) The bicycle crank assembly disclosed herein includes a rotation center axis. A b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62M1/36B62M9/10
CPCB62M1/36B62M9/10B62M9/00B62M9/105B62M3/00
Inventor 蒲田建二
Owner SHIMANO INC
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