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Right crank arm assembly for a bicycle and crank arm and front sprocket thereof

A crank arm and front sprocket technology, applied in the field of right crank arm assembly, can solve the problems of front sprocket twist, small thickness, large front sprocket bending, etc.

Active Publication Date: 2008-02-13
CAMPAGNOLO SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The applicant has found that, in order to minimize the overall weight of the known assembly, the connecting arm of the crank arm and the corresponding connecting element of the front sprocket are manufactured with a very small thickness, which causes twisting of the front sprocket
[0010] Applicants have also found that with stiffened crank arms, front sprockets made of light materials still continue to flex significantly

Method used

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  • Right crank arm assembly for a bicycle and crank arm and front sprocket thereof
  • Right crank arm assembly for a bicycle and crank arm and front sprocket thereof
  • Right crank arm assembly for a bicycle and crank arm and front sprocket thereof

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Embodiment Construction

[0140] Referring to FIGS. 1 and 2 , a right crank arm assembly according to the present invention is indicated at 1 . The assembly 1 comprises a right crank arm 5, a large diameter front sprocket 10 (hereinafter referred to as large front sprocket) and a small diameter front sprocket 15 (hereinafter referred to as small front sprocket). Alternative and not shown embodiments are foreseen in which the assembly 1 comprises only one front sprocket, for example for racing use, or more than two front sprockets, for example three front sprockets.

[0141] 8 Throughout the specification and in the claims that follow, "inside" of the assembly 1, of the crank arm 5 and / or of the front sprockets 10 and 15 means the side that can be seen in Figures 1 and 3, i.e. when the assembly 1 The side that faces the bicycle frame when mounted on the bottom frame assembly. On the other hand, "outside" refers to the surface visible in FIGS. 2 and 4 opposite to the inside.

[0142] Moreover, througho...

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Abstract

A right crank arm assembly (1) for a bicycle, comprises a right crank arm (5) and at least one front sprocket (10) coupled with the crank arm at at least one coupling portion (44) of the crank arm. The front sprocket (10) has an inner side adapted, in use, to face towards the frame of the bicycle and an outer side opposite the inner side. The assembly (1) comprises at least one first crank arm element (30) which acts in contact with the front sprocket (10) on one of said sides and at least one second crank arm element (35) which acts in contact with the front sprocket (10) on the other of said sides. The contact action of the crank arm elements on the two opposite sides of the front sprocket prevents the twisting deformation of the front sprocket during pedalling. Such a deformation wouldcause a reduction in the transmission efficiency of the right crank arm assembly.

Description

technical field [0001] The present invention relates to a right crank arm assembly for a bicycle, its crank arm and its front sprocket. Background technique [0002] Generally, in the field of bicycles, the term "right crank arm assembly" is used to refer to an assembly comprising a right crank arm and at least one front sprocket connected to the right crank arm. In particular, the front sprocket is a toothed wheel suitable for driving a bicycle chain for transferring motion to the rear wheel of the bicycle, which movement is imparted by the cyclist by pedaling. [0003] In a conventional bicycle, the right crank arm is directly connected to the front sprocket at a corresponding surface formed on a respective front face of such a component. Specifically, the inside of the crank arm and the front sprocket is formed and an outside opposite to the inside, the inside is intended to face the frame of the bicycle in use, the outside faces outside in use, the right crank arm The ...

Claims

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Application Information

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IPC IPC(8): B62M9/10B62M3/00
CPCF16H55/30B62M3/00B62M9/105Y10T74/2164Y10T74/2165
Inventor 毛里齐奥·瓦莱保罗·帕斯夸
Owner CAMPAGNOLO SRL
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