CN200988562Y

CN200988562Y - Bicycle chain power transfer structure

Info

Publication number: CN200988562Y
Application number: CN 200620130683
Authority: CN
Inventors: 谢宜玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-08-09
Filing date: 2006-08-09
Publication date: 2007-12-12
Anticipated expiration: 2016-08-09

Abstract

The utility model relates to a power transmission structure for the bicycle chain, which is characterized in that a unidirectional ratchet wheel driving device is respectively arranged on the bicycle crank shaft and on the rear wheel spoke hub; a gear component is respectively combined on two unidirectional ratchet wheel driving devices; a chain is arranged between the gear components; wherein, the chain driving force acted by the ratchet wheel on the rear side unidirectional ratchet wheel driving device acting start resistance force via the gear component is larger than the start resistant force on the ratchet wheel positioned on the front side unidirectional ratchet wheel driving device, so that the bicycle is able to shift directly by the rear wheel driving the chain to turn forwards while the bicycle is traveling, and when the chain is blocked, the rear side unidirectional ratchet wheel driving mechanism is able to make the gear component in the neutral against the rear wheel, which achieves to protect the shifting device.

Description

Cycle chain transmission of power structure

Technical field

The utility model relates to a kind of structure that is used for the cycle chain transferring power, relate in particular to a kind of when bicycle is advanced crank need not trample that chain also rotates thereupon and chain can not damage the cycle chain transmission of power structure of speed-changing mechanism when interrupted.

Background technology

Existing bicycle is to step on pedal with pin, make the crank that is provided with pedal drive the crank shaft rotation forward that is incorporated between two cranks thus, make the preceding fluted disc group drive chain that is fixedly arranged on the crank shaft rotate forward, drive trailing wheel with the rear tooth disk group of chain gear trailing wheel and rotate, drive bicycle and march forward.

In bicycle is advanced and the pedal of user's treadled cycle when reversing, because the trailing wheel flower-drum is for to number the wherein disclosed hub structure of [single speed ratchet flower-drum] novel patent case No. 306412 as the Taiwan patent announcement, perhaps be provided with as the Taiwan patent announcement and number the disclosed flywheel of No. 368974 [bicycle freewheel] novel patent case in trailing wheel flower-drum one side, make the chain reversing drive when being installed in the rear tooth disk group of trailing wheel, can utilize single direction ratchet devices such as the pawl seat of flower-drum body or flywheel, make and can not drive the flower-drum body idle running relatively of rear tooth disk group flower-drum body and trailing wheel thus and rotate backward.

And in bicycle is advanced and user when not stepping on pedal, though trailing wheel rotated forward and advanced but produce idle running owing to understand utilization between this cognitions of flower-drum and rear tooth disk group as the single direction ratchet device that is disclosed in above-mentioned two cases this moment, can not drive chain and rotate forward and reach the safe effect that speed-changing mechanism does not damage when driving.

And similar above-mentioned bicycle prevents that the device mode that speed-changing mechanism damages from also having other means, for example be not provided with the single direction ratchet device in the trailing wheel flower-drum, and only be provided with the single direction ratchet device in a side of crank shaft, for example aforesaid flywheel, and outside this single direction ratchet device in conjunction with preceding fluted disc group, crank shaft and preceding fluted disc group idle running when the user steps on pedal backward thus, can not drive chain reverses and the danger of generation speed-changing mechanism infringement, and since bicycle when advancing trailing wheel can drive chain and continue rotation forward, therefore also can reach does not need push down on the pedal to quicken and the effect of bicycle gearshift can be had when descending is competed for speed safely and the effect of controlling speed easily.

Though above-mentioned only in the set-up mode that crank shaft is provided with the single direction ratchet device can reach step on pedal reversing safety and advance between the direct effect of gearshift, yet because this device mode can make chain constantly rotate when advancing, make when downslope race etc. has occasion that the handstone of beating blocks chain and uses, because trailing wheel still continued to drive chain forward when chain was interrupted, can cause the problem of the stuck variable transmission mechanism of chain releasing, in the occasion that the downslope race of bicycle etc. drives at a high speed, more seem dangerous, the necessity that is improved is arranged.

The utility model content

Because only the set-up mode that is provided with the single direction ratchet device in crank shaft has chain produces the change-speed box damage when interrupted problem, the utility model provides a kind of transmission of power structure, crank shaft and trailing wheel flower-drum two places with bicycle all are provided with the single direction ratchet Design of device, reach to prevent that chain from damaging the problem of speed-changing mechanism between advancing.

For achieving the above object, the utility model provides a kind of cycle chain transmission of power structure, it is provided with first a single direction ratchet actuating device of being located at crank shaft one side, fluted disc group before this first single direction ratchet actuating device is in conjunction with one, preceding fluted disc group includes more than one preceding fluted disc, be provided with second a single direction ratchet actuating device that is incorporated into trailing wheel flower-drum one side, in this second single direction ratchet actuating device in conjunction with a rear tooth disk group, the rear tooth disk group includes more than one rear tooth disk group, in preceding, a sheathed chain between the rear tooth disk group, and this second single direction ratchet actuating device sees through the ratchet action launching resistance of the strength of rear tooth disk group chain drive-belt greater than the first single direction ratchet actuating device with ratchet action launching resistance.

When bicycle is advanced, the trailing wheel rotation drives the single direction ratchet device, because the second single direction ratchet actuating device sees through the ratchet action launching resistance of the strength of each rear tooth disk chain drive-belt greater than the first single direction ratchet actuating device with ratchet action launching resistance, therefore the single direction ratchet device can rotate forward with its ratchet action launching resistance drive rear tooth disk, the rotation forward that chain is continued reaches the effect that can directly shift gears when advancing.

And when chain hinders because of external force is subjected to blocking, because the stuck resistance of chain sees through the strength that each rear tooth disk transmitted greater than the ratchet action launching resistance of the second single direction ratchet actuating device, therefore the single direction ratchet device can make between trailing wheel and the rear tooth disk and dally, can not drive chain more forward, therefore can prevent that the chain that send before chain continues from damaging the speed-changing mechanism problem, reach to drive purpose of safety.

By the above as can be known, the utility model not only can be finished when bicycle is advanced and can drive chain forward then can directly shift gears with trailing wheel, and when chain is interrupted, can also make the idle running of the relative trailing wheel of rear tooth disk and reach safe effect, avoid the shortcoming that speed-changing mechanism damages thus and more can make things convenient for the user when descending is competed for speed directly gearshift use.

Description of drawings

Fig. 1 is the lateral plan that is installed in bicycle in the utility model preferred embodiment.

Fig. 2 is the block diagram of the utility model preferred embodiment front side.

Fig. 3 is the block diagram of the utility model preferred embodiment rear side.

Fig. 4 is the utility model preferred embodiment flower-drum body and single direction ratchet device block diagram.

Fig. 5 is that the utility model preferred embodiment is implemented scheme drawing.

Fig. 6 is that the utility model preferred embodiment is implemented scheme drawing.

The primary clustering nomenclature

10 vehicle frames, 11 crank shafts

12 trailing wheel flower-drum bodies, 13 anti-lost chain devices

14 cranks, 15 pedals

16 trailing wheels, 20 unilateral bearings

Fluted disc before 21 outer shrouds 30

40 single direction ratchet devices, 41 pawl seats

50 rear tooth disk groups, 51 rear tooth disks

60 chains

The specific embodiment

A kind of cycle chain transmission of power structure that the utility model is related, please referring to Fig. 1 to Fig. 5, this bicycle is provided with a vehicle frame 10, but five-way pipe and back vent in vehicle frame 10 respectively are pivoted with a crank shaft 11 and a trailing wheel flower-drum body 12 with the rotation kenel, and vehicle frame 10 in the upside position of five-way pipe in conjunction with an anti-lost chain device 13, crank shaft 11 two ends are respectively in conjunction with a crank 14, each crank 14 is in the free end pedal 15 that is pivoted, and trailing wheel flower-drum body 12 is in conjunction with a trailing wheel 16, and the utility model preferred embodiment is provided with:

One is installed in the unilateral bearing 20 of crank shaft 11 1 sides, unilateral bearing 20 is provided with an outer shroud 21, be provided with two preceding fluted discs 30 and be incorporated into outer shroud 21, fluted disc 30 is positioned at the below of anti-lost chain device 13 before each, and unilateral bearing 20 is F1 with the driving force size that ratchet action launching resistance outwards transmits through fluted disc 30 before each.

One is assembled in the single direction ratchet device 40 of trailing wheel flower-drum body 12 1 sides, the periphery of single direction ratchet device 40 is provided with a pawl seat 41, sheathed in conjunction with a rear tooth disk group 50 outside pawl seat 41, rear tooth disk group 50 comprises several rear tooth disks 51, and single direction ratchet device 40 sees through each rear tooth disk 51 with ratchet action launching resistance and the strength size outwards transmitted is F2, F2＞F1.

One chain 60, chain 60) be sheathed on wherein one before fluted disc 30 and wherein between the rear tooth disk 51, and the top of chain 60 front sides passes anti-lost chain device 13.

When bicycle is advanced, please referring to Fig. 3 to Fig. 5, trailing wheel 16 rotations drive single direction ratchet device 40, because F2＞F1, therefore single direction ratchet device 40 can rotate forward with its ratchet action launching resistance drive rear tooth disk 51, the rotation forward that chain 60 is continued, (the F2 strength size of safety is set at: the resistance of F2＞F1+ gearshift moment) to reach the effect that can directly shift gears when advancing.

And run handstone and make the front side blocking of chain 60 and when being subjected to hindering when anti-lost chain device 13, please referring to Fig. 3, Fig. 4, Fig. 6, because the stuck resistance of chain 60 is greater than F2, therefore at this time single direction ratchet device 40 can make idle running between trailing wheel 16 and the rear tooth disk 51, can not drive chain 60 more forward, the situation that therefore can prevent in real time that chain is stuck and damage speed-changing mechanism takes place, and reaches to drive purpose of safety.

Claims

1. a cycle chain transmission of power is constructed, it is characterized in that, it is provided with first a single direction ratchet actuating device of being located at crank shaft one side, fluted disc group before this first single direction ratchet actuating device is in conjunction with one, should preceding fluted disc group include more than one preceding fluted disc, be provided with second a single direction ratchet actuating device that is incorporated into trailing wheel flower-drum one side, in this second single direction ratchet actuating device in conjunction with a rear tooth disk group, this rear tooth disk group includes more than one rear tooth disk, in preceding, a sheathed chain between the rear tooth disk group, and this second single direction ratchet actuating device sees through the strength that the rear tooth disk group drives this chain with ratchet action launching resistance, greater than the ratchet action launching resistance of the first single direction ratchet actuating device.