CN2411962Y

CN2411962Y - Bicycle rear speed variator

Info

Publication number: CN2411962Y
Application number: CN00231596U
Authority: CN
Inventors: 张德辉
Original assignee: CHUANFEI INDUSTRY Co Ltd
Current assignee: CHUANFEI INDUSTRY Co Ltd
Priority date: 2000-03-30
Filing date: 2000-03-30
Publication date: 2000-12-27
Anticipated expiration: 2010-03-30

Abstract

The utility model relates to a bicycle rear speed variator which is assembled on a wheel shaft of a rear wheel of a bicycle, and the bicycle rear speed variator is composed of a fixed connecting piece, a translation mechanism, a guiding wheel group, a conducting wire and a biasing device, wherein, the translation mechanism is a four-connecting rod mechanism, a first connecting rod of the translation mechanism is a bending section with a preset angle, the bending section is pivoted with a second and a fourth connecting rods, and in addition, a third connecting rod is in bridge joint between the second and the fourth connecting rod, and the guiding wheel group is assembled on the third connecting rod, so the translation mechanism and the guiding wheel group are positioned between the fixed connecting piece and the rear wheel of the bicycle.

Description

Bicycle rear derailleur

The utility model is relevant with bicycle assembly, more detailed is meant a kind of bicycle rear derailleur.

Pressing, see also shown in Figure 1ly, is the scheme drawing of Regular Bicycle Rear Derailleur, and this change-speed box is connected on the wheel shaft A of bicycle rear, hangs the position in order to the cymbals of a chain B between a fluted disc group C of adjusting bicycle; Wherein, one fastener 1 of this change-speed box is locked on this wheel shaft A, and a first connecting rod 2a one termination of a translation mechanism 2 is located on this fastener 1, its other end then supplies one second, the 4th connecting rod 2b, 2d articulates, and this is second years old, the 4th connecting rod 2b, bridge joint has a third connecting rod 2c between the 2b, this third connecting rod 2c goes up and is equipped with guiding wheels 3, these guiding wheels 3 are around extension for this chain B, in addition, one lead 4 passes to be located at one on this first connecting rod 2a and to connect portion 5, these lead 4 latter ends also twine solid at a fixed part 6 places that are located on the 4th connecting rod 2d, again, a bias piece 7 (wind spring) is mounted on this translation mechanism 2, and it provides this translation mechanism 2 of a pushing tow to depart from the partial pressure force of this fluted disc group C maximum gauge fluted disc C1, the base this, said modules constitutes this rear-wheel transmission.

As shown in Figure 1, 2, be this chain B respectively at the scheme drawing when hanging over this fluted disc group C minimum diameter fluted disc C2 and maximum gauge fluted disc C1 and go up, when this chain B when the big small tooth plate of difference upstream is walked, these guiding wheels 3 will change the ornaments position in good time thereupon, use effectively this chain B is formed the effect that supports, unlikely formation is slack and undisciplined to keep certain the opening of this chain B establish degree, so that the safety when guaranteeing to drive.

Really, though said mechanism is habitually practised by industry, only, it still has following disappearance on installing is gone up and operated:

1. the position with this fastener 1 locking is that benchmark is a baseline L in advance, consider diagram in light of actual conditions as can be known, the general employed Rear Derailleur of industry, its translation mechanism 2 is to be to be provided with to be positioned at this baseline L outside, therefore, the person of taking advantage of causes interference to this translation mechanism 2 after on this wheel shaft A to trampling easily, especially when after the person of taking advantage of when setting foot on or recessing this wheel shaft A, or the person of taking advantage of tramples shakiness and during this wheel shaft of landing A after being, this outstanding translation mechanism 2 more will to after the person of taking advantage of damage.

2. desire when this minimum diameter fluted disc C2 is converted into this maximum gauge fluted disc C1 as this chain B, the draw power of tearing of this lead 4, the resistance that climbs when switching to major diameter by minor diameter except resisting, more necessary this bias piece 7 application force of pushing tow outwardly of resisting simultaneously, therefore, the lead 4 of this change-speed box is bound to such an extent that the more resistibility of antagonism can be carried out gear shifting operation smoothly, so it loses the service life of this lead 4 easily.

In view of this, the utility model creator thinks funiculus through detailed, and the long-pending research and development experience of being engaged in the bicycle spare part for many years, and generation of the present utility model is arranged eventually.

That is, main purpose of the present utility model is to provide a kind of bicycle rear derailleur, and it has to use goes up safety.

Again, secondary objective of the present utility model is to provide a kind of bicycle rear derailleur, and it can prolong the service life of this lead.

Edge is to reach above-mentioned purpose, a kind of bicycle rear derailleur provided by the utility model is to be connected on the wheel shaft of bicycle rear, in order to adjust cycle chain between a fluted disc group around hanging the position, this change-speed box comprises: a fastener is to be arranged on this wheel shaft; One translation mechanism, form by the pivot joint of the one first, second, third and the 4th connecting rod, this first connecting rod one end and this fastener link, its other end then articulates for this second, the 4th connecting rod, and this third connecting rod bridges on this second, the 4th connecting rod, uses the composition four-bar linkage, in addition, one portion of connecting is located on this first connecting rod, and a fixed part then is located on all the other arbitrary connecting rods; One guiding wheels are to be mounted on this third connecting rod, and it and impels this chain to change the position that is positioned on this fluted disc group with this translation mechanism start for the chain of bicycle around the home; One lead is to pass this to connect portion and be fixed on this fixed part, produces and moves action in order to draw this translation mechanism; One biasing device is located on this translation mechanism, impels this translation mechanism to remain on a desired location at ordinary times in order to a partial pressure force to be provided; Wherein, this Rear Derailleur is characterised in that: this first connecting rod has a bending segment of predetermined angular, and articulates this second, the 4th connecting rod on this bending segment, in view of the above, makes this translation mechanism and this guiding wheels be between this fastener and bicycle rear.

Wherein this biasing device makes the direction beat of this translation mechanism towards the maximum gauge fluted disc.

Wherein this biasing device is a coil tension spring, its two ends be arranged in respectively this second with third connecting rod on.

Wherein this fixed part is located on the second connecting rod.

Below, enumerate preferred embodiment of the present utility model now, and after cooperating following diagram to be described in more detail in, wherein:

Fig. 1 commonly uses cycle chain around the scheme drawing that is hung on the minimum diameter fluted disc.

Fig. 2 commonly uses cycle chain around the scheme drawing that is hung on the maximum gauge fluted disc.

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

Fig. 4 is the end face scheme drawing of translation mechanism among Fig. 3.

Fig. 5 is the forward plan sketch of Fig. 3.

Fig. 6 is that the above-mentioned preferred embodiment chain of the utility model is around the scheme drawing that is hung on the maximum gauge fluted disc.

Fig. 7 is the 7-7 directional profile scheme drawing of Fig. 6.

Fig. 8 is that the above-mentioned preferred embodiment chain of the utility model is around the scheme drawing that is hung on the minimum diameter fluted disc.

Fig. 9 is the 9-9 directional profile scheme drawing of Fig. 8.

See also shown in Fig. 3 to 6, bicycle rear derailleur that the utility model provides is to be connected on the wheel shaft A of bicycle rear, in order to adjust cycle chain B between a fluted disc group C around hanging the position, and this fluted disc group C is made up of the fluted disc of some tool different-diameter sizes, its maximum gauge fluted disc represents that with C1 the minimum diameter fluted disc is then represented with C2:

Rear Derailleur 100 of the present utility model is by a fastener 10, a translation mechanism 20, guiding wheels 30, a lead 40 and 50 common makers-ups of a biasing device; Gu this fastener 10, this translation mechanism 20, these guiding wheels 30 and this lead 40 etc. are to belong to prior art, so, with regard to above-mentioned composition, only structure of necessity and main improvement emphasis are narration in this; Wherein:

This fastener 10 is to be arranged on this wheel shaft A in the locking mode.

This translation mechanism 20 is articulated mutually by the one first, second, third and the 4th connecting

rod

21,22,23 and 24 to be formed, wherein;

This first connecting rod 21 has a vertical section 211 and also bends a bending segment 212 of establishing at a predetermined angle along continuous this vertical section 211, this first connecting rod 21 links with this fastener 10 with its vertical section 211, and this vertical section 211 be provided with that hollow screw constitutes one connect portion 25;

This second, the 4th connecting rod the 22, the 24th is set in parallel and is articulated in jointly on the bending segment 212 of this first connecting rod 21, being provided with the turn screw rod in these second connecting rod 22 end faces in addition serves as to press a fixed part 26 of setting the position, and has one first hook part 221 on these second connecting rod 22 bottom surfaces;

And this third connecting rod 23 is these the second, the 4th connecting

rods

22,24 of bridge joint to form four-bar linkage, in view of the above, this second, third and the 4th connecting

rod

22,23 and 24 are this first connecting rods 21 and make the translation beat and move relatively; Again, these third connecting rod 23 bottom surfaces have one second hook part 231.

This guides wheels 30, is to be mounted on this third connecting rod 23, and it has a guide wheel 31 and the idle pulley 32 around the home for cycle chain B, should guide the beat start of wheels 30 with this translation mechanism 20 again, and impels this chain B to change the position that is positioned on this fluted disc group C.

This lead 40 is to be a rigidity rope body, it is after the portion of passing on this first connecting rod 21 that connects 25, be fixed in the fixed part 26 on this second connecting rod 22 again, and torn and do the time spent when this lead 40, can related change its connect line length between portion 25 and this fixed part 26 at this, use and tear this translation mechanism 20 of traction and produce and move action.

This biasing device 50 is to be a coil tension spring, on first hook part 221 that its two ends distinctly are arranged in this second connecting rod 22 and second hook part 231 of this third connecting rod 23, the restoring force of its solid tool reinstatement, and provide a partial pressure force to impel this translation mechanism 20 indirectly in the direction beat that remains at ordinary times towards maximum gauge fluted disc C1.

In view of the above, said structure makes this translation mechanism 20 and this guiding wheels 30 be to be positioned between this fastener 10 and the bicycle rear (figure does not show).

Be with, above-mentionedly be the structure of each member of the utility model bicycle rear derailleur and the explanation of associated location thereof, then, again with its action and effect statement as back:

As shown in Figure 6, be that this chain B is placed in the scheme drawing (this figure is to looking it from the bicycle dead aft) on this maximum gauge fluted disc C1, at this moment, second, third and the 4th connecting

rod

22,23 and 24 that the partial pressure force of this biasing device 50 will be impelled this translation mechanism 20 is simultaneously towards the direction beat (with reference to shown in Figure 7) of this maximum gauge fluted disc C1, relatively, these guiding wheels 30 will draw this chain 8 around being hung on this fluted disc C1.

See also shown in Figure 8 again, be that this chain B is placed in the scheme drawing on this minimum diameter fluted disc C2, affect this second, third and the 4th connecting

rod

22,23 and the 24 direction beats towards this minimum diameter fluted disc C2 (with reference to shown in Figure 9) by the traction of this lead 40, it will drive these guiding wheels 30 and stir this chain B around being hung on this minimum diameter fluted disc C2; Certainly, with the degree of tearing of controlling this lead 40 can reach control this chain B around hanging the position.

Make flowing mode as can be known by aforesaid, as chain B desire to climb (with reference to Fig. 6) when switching to major diameter fluted disc C1 position from minor diameter fluted disc C2 position (with reference to Fig. 8), this lead 40 must be resisted the resistance when climbing when start, so, this lead 40 is in order to resist the mode of this resistance, except lead 40 application forces when tearing traction own, still the partial pressure force that has this biasing device 50 to produce the same function direction is auxiliary, this biasing device 50 of mat share effectively this lead 40 original the application force that must pay, so can prolong the service life of this lead 40, moreover, above-mentioned these application forces are to be the addition effect, therefore, when this chain B switches to major diameter fluted disc C1 on minor diameter fluted disc C2, can carry out change action more easily.

In addition, the utility model more designs by the bending segment 212 of this first connecting rod 21, impel this translation mechanism 20 and this guiding wheels 30 to be and be positioned between this fastener 10 and the bicycle rear (figure does not show), therefore, for the bicycle rear wheel shaft prolong projection for after for the person of taking advantage of tramples on it, said modules with unlikely to after the person of taking advantage of in setting foot on, back off or damaging during slippage, it increases the safety in the use.

In sum, the utility model is real in like product to have its progressive practicality, and uses and go up conveniently, again, the utility model there is no identical items and sees publication or public use before application, be with, the utility model has possessed novel patent requirement in fact, files an application in the whence in accordance with the law.

Only, the above person only is a preferable possible embodiments of the present utility model, changes so use the equivalent structure that the utility model specification sheets and claim do such as, ought to be included in the claim of the present utility model.

Claims

1. a bicycle rear derailleur is to be connected on the wheel shaft of bicycle rear, in order to adjust cycle chain between a fluted disc group around hanging the position, this change-speed box comprises:

One fastener is to be arranged on this wheel shaft;

One translation mechanism, form by the pivot joint of the one first, second, third and the 4th connecting rod, this first connecting rod one end and this fastener link, its other end then articulates for this second, the 4th connecting rod, and this third connecting rod bridges on this second, the 4th connecting rod, in addition, the portion of connecting is located on this first connecting rod, and a fixed part then is located on all the other arbitrary connecting rods;

One guiding wheels are to be mounted on this third connecting rod, and it and impels this chain to change the position that is positioned on this fluted disc group with this translation mechanism start for the chain of bicycle around the home;

One produces the lead of moving action in order to draw this translation mechanism, is to pass this to connect portion and be fixed on this fixed part;

One in order to provide a partial pressure force to impel this translation mechanism in the biasing device that remains on a desired location at ordinary times, is located on this translation mechanism;

Wherein, this Rear Derailleur is characterised in that:

This first connecting rod has a bending segment of predetermined angular, and articulates this second, the 4th connecting rod on this bending segment, and in view of the above, this translation mechanism and this guiding wheels are between this fastener and bicycle rear.

2. bicycle rear derailleur according to claim 1 is characterized in that, wherein this biasing device makes the direction beat of this translation mechanism towards the maximum gauge fluted disc.

3. bicycle rear derailleur according to claim 2 is characterized in that, wherein this biasing device is a coil tension spring, its two ends be arranged in respectively this second with third connecting rod on.

4. bicycle rear derailleur according to claim 1 is characterized in that wherein this fixed part is located on the second connecting rod.