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Bicycle crankset with two chainrings

A technology for bicycles and chainrings, applied in the field of cranksets, can solve the problems of ineffective use and unsuitable cranksets, etc.

Inactive Publication Date: 2008-08-27
LOOK CYCLE INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these cranksets are sometimes neither suitable nor effective for use in moderate terrain, the gears used on flat ground lead to more crossing of the chain, and the chain works in harsh conditions

Method used

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  • Bicycle crankset with two chainrings
  • Bicycle crankset with two chainrings
  • Bicycle crankset with two chainrings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] In the figures, identical or equivalent parts have the same reference numerals.

[0035] A crankset 1 of a bicycle (see FIG. 5 ) includes a bottom bracket shaft 2 connected at its opposite ends to a right crank 3 and a left crank 4 extending in opposite directions, respectively, and the cranks 3 and 4 can be mounted on them respectively. A right pedal and a left pedal (not shown) are installed on the ends of the pedal.

[0036] The bicycle crankset of the present invention is in particular a crankset of the double chainring type, ie a first chainring 5 and a second toothing 6 with different diameters, the first chainring 5 being larger than the second chainring 6 . The teeth 7 of the first and second chainrings 5, 6 can cooperate with a transmission chain (not shown), which in turn drives in rotation the rear wheel (not shown) of the bicycle.

[0037] The first and second chainrings 5, 6 are installed on the chainring bracket 8, the chainring bracket 8 is provided with...

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PUM

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Abstract

The bicycle crankset includes a bottom bracket axle, two cranks and a chainring carrier bearing first and second different toothed chainrings. The chainring carrier has the shape of a star, of which each arm is provided with a mounting hole aligned with a mounting hole in the first and second chainrings respectively. These holes accommodate elements for fastening chainrings to the chainring carrier, and they are arranged on a first circle with a predetermined diameter. Each arm of the chainring carrier is provided with a second mounting hole arranged on a second circle with a diameter that has been reduced relative to the first circle to match the chainring carrier to two other toothed circular chainrings with a size that is respectively reduced relative to the first and second chainringsand of which the mounting holes are located on the second circle.

Description

technical field [0001] The present invention relates to a crankset for a bicycle, and it also relates to a bicycle equipped with the crankset according to the invention. Background technique [0002] The invention relates in particular to a bicycle crankset with two chainrings, i.e. it comprises a chainring called a large chainring and a chainring called a small chainring, the large chainring making it possible to obtain a large number of The effective rear wheel circumference (gear inches) of one pedal cycle, for downhill riding with the bicycle or riding on the flat ground, the small chainring has a reduced ring gear relative to the large chainring, which allows more Climb mountains with ease or start more easily. [0003] Bicycle cranksets with two chainrings first appeared on racing bikes and then became common on touring bikes. [0004] Any bicycle crankset of this type consists of a bottom bracket shaft, two cranks attached to opposite ends of the bottom bracket shaf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62M9/10B62M1/36
CPCB62M9/105
Inventor 朱利安·布歇
Owner LOOK CYCLE INT