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A crank assembly

A technology of cranks and assemblies, applied in the field of crank assemblies, can solve the problems of inability to achieve flexibility and advance of cranks

Inactive Publication Date: 2009-09-16
SPERERO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this arrangement has the disadvantage of not being able to achieve sufficient flexible advance of the crank relative to the sprocket rim
Therefore, the energy stored is not enough to provide appreciable effect in the performance of the bike

Method used

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Embodiment Construction

[0057] Figure 1 and figure 2 A crank assembly 10 according to a first embodiment of the invention is schematically shown. The crank assembly 10 is mountable to a bicycle where the rider drives a pedal crank (not shown) which imparts rotational motion to the rear (drive) of the bicycle through the crank assembly 10 and a chain (also not shown). wheel.

[0058] The crank assembly 10 has a chain ring 12 in the form of a thin ring and provided with teeth 14 on the outer circumferential surface. It will be appreciated that the chain has grooves into which the teeth 14 engage to cause the chain to move. The chainring 12 has five bolt holes 16 (four are shown in FIG. 1 ) which enable the chainring 12 to be connected to a support disc 18 . The support plate 18 has an inner portion 20 with a central opening 22 ; an outer portion 24 ; and five arms 26 extending between the inner portion 20 and the outer portion 24 . The support plate 18 further has five bolt holes 28 (four shown in ...

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PUM

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Abstract

A crank assembly (10) for use on a human powered machine, the crank assembly having one or more cranks that can be connected to opposing ends of an axle (30) of the machine. The crank assembly further has a chain ring (12) having teeth (14) for engagement with a drive element, the chain ring being capable of being supported on the axle such that the chain ring can rotate relative to the axle; and a set of two or more leaf springs (40), each spring has a root that can be rotationally fixed relative to the axle and a tip that bears against the chain ring to impart force to the chain ring. Each spring tapers from the root to the tip in a plane of the chain ring.

Description

technical field [0001] The present invention relates to a crank assembly for use in a human powered machine. Background technique [0002] The drive crank assemblies on many human-powered machines, such as bicycles, are generally designed to be as stiff as possible so that the rotational position of the crank is equal to the rotational position of the crank wheel (which on a bicycle is generally referred to as a chain ring). On a conventional bicycle, the rider's leg strength is at a maximum in the region where the pedals travel approximately vertically and is at a minimum in the region where the pedals travel horizontally. Therefore, the force transmitted to the rear (drive) wheels is periodic and oscillates between a maximum and a minimum. [0003] It is known to introduce a level of compliance in a power cycle transmission system. Some prior art crank assemblies incorporate compliance such that the crank of the assembly can be temporarily advanced relative to the teeth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62M1/02B62M3/00B62M1/10B62M21/00F16H55/14F16H55/30B62M1/36
CPCB62M1/105Y10T74/2178
Inventor 科林·阿瑟·马丁
Owner SPERERO