JP3204705B2 - Rear derailleur for bicycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mounting bracket,
A support for supporting a chain transfer wheel, the support and the mounting bracket being in a state in which the support is positioned on the front side of the vehicle with respect to the mounting bracket when the mounting bracket is connected to the vehicle. A chain link that is connected to the mounting bracket, the support link, and a swing link of a quadruple link mechanism that includes the rocking link. And a rear derailleur for a bicycle configured to move in the direction of the axis of rotation of the bicycle.

[0002]

2. Description of the Related Art In a conventional rear derailleur, as shown in, for example, Japanese Utility Model Application Laid-Open No. 56-134297, a speed change operation wire is bent at the rear side of the derailleur to change the direction from the rear of the vehicle to the front of the vehicle. By arranging the wires as described above, the speed change operation wire from the speed change operation device located on the vehicle body front side with respect to the derailleur can be guided to the derailleur and interlocked with the swing link body, and can swing with the speed change operation wire. The derailleur can be operated so that the chain-changing wheel moves in the direction of the rotation axis of the chain sprocket and the chain-changing is performed satisfactorily simply by enabling the linkage with the link body. I was

[0003]

Conventionally, since the speed change operation wire is bent with a small radius in the vicinity of the derailleur, and since the outer wire for guiding the inner wire is indispensable at the wire bending point, the speed change operation wire is caused by the operation wire. The resulting operating resistance is relatively large, often resulting in a heavy shifting operation. SUMMARY OF THE INVENTION An object of the present invention is to provide a rear derailleur that can be operated relatively easily with a relatively simple structure and that can also suppress the swinging movement of a chain by using a speed change operation wire.

[0004]

In a bicycle rear derailleur according to the present invention, in order to achieve the object, in the first embodiment, the mounting bracket is attached to the chain by tension.
And attached to the vehicle body so that it can swing
An outer connecting portion for connecting an outer wire of a speed change operation wire to the support or the swing link body; and an inner connecting portion for connecting an inner wire of the speed change operation wire; The swing link body or the mounting bracket body is provided in a state of being located on the rear side of the vehicle body with respect to the outer connecting portion in a state of being connected to the swinging link body or the mounting bracket body.

[0005]

When the outer connecting portion is provided on the support, the inner connecting portion is provided on the swing link body or the mounting bracket body. When the outer connecting portion is provided on the swing link body, the inner connecting portion is provided on a swing link body or a mounting bracket body different from the one provided with the outer connecting portion. Then, even if the speed change operation wire connects the wire directly from the front of the derailleur to the derailleur, the outer wire of the operation wire is connected to the outer connection portion due to the above-described arrangement relationship between the outer connection portion and the inner connection portion. When the speed change operation wire is operated by connecting the inner wire to the swing link body or the mounting bracket body via the inner connecting portion and connecting the inner wire to the mounting bracket body or the swing link body via The four-link mechanism swings to move the chain change wheel in the direction of the rotation axis of the chain sprocket. In particular, since the mounting bracket is configured to be tensioned so as to apply tension to the chain by urging the mounting bracket to swing with respect to the vehicle body, and the mounting bracket is configured to swing with respect to the vehicle body. The outer wire suppresses chain vibration via the derailleur. That is, when the chain swings up and down due to running vibration and the mounting bracket body swings with respect to the vehicle body due to the inertia of the chain, the amplitude of the chain increases. However, the body side of the outer wire is fastened to the body frame near the derailleur, and the derailleur side end of the outer wire is connected to the support or the swinging link body. By being located at a position relatively far from the mounting bracket body rocking axis as the whole body rocking axis, the outer wire uses the securing point by the body frame as a reaction point, and
The connection point of the support or the swing link body acts as a point of action on the derailleur and acts as a damper on the derailleur to suppress the swing caused by the chain vibration of the derailleur.

[0006]

According to the present invention, the shift operation wire can be moved and operated from the front side of the derailleur while the shift operation wheel can be moved by a simple structure in which the shift operation wire is simply connected to the constituent members of the quadruple link mechanism. By directly reaching and linking with the four-link mechanism, the speed change operation wire is arranged so as not to be curved as much as possible, and the wire resistance is reduced in terms of the degree of bending of the speed change operation wire, and lightly You can now change gears. In particular, since the enabling car body side rocking of the mounting bracket body, effectively utilizing the shift operating wire to suppress the chain vibration, Toka Chen cut - greatly vibrate, etc. falls body frame for vibrating It is possible to easily avoid the trouble of the structure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 3, a support 4 is mounted on a mounting bracket 1 via a pair of swing links 2 and 3. FIG.
And a chain change wheel 7 and a tension wheel 8 are attached to the support 4 via a guide plate 5 so that the support 4 is located on the front side of the vehicle body with respect to the mounting bracket 1. , And a rear wheel drive chain sprocket S supported by the body frame F
.. by operating the chain changing wheel 7 and the tension wheel 8 on the chain C below the chain C, and by operating the speed change operation wire 9 operated by a speed change operation device (not shown). The rear derailleur for bicycles is configured so that the chain C can be changed.

That is, the mounting bracket body 1 is swung around the vehicle body lateral axis X by a mounting screw 10 provided at one end side as shown in FIG. Is connected to the vehicle body by tightening and fixing as much as possible. By this bracket connection, the derailleur is brought into a predetermined assembled state with respect to the vehicle body. In this assembled state, the axis X as the swing axis of the mounting bracket body 1 with respect to the body frame F, and the guide plate 5 Support 4
Each of the pivot axes Y with respect to the chain sprocket S
Of the swing link body 2 with respect to the mounting bracket body 1
The pivot axis P2 with respect to the support 4 and the pivot axis P3 with respect to the mounting bracket body 1 of the pivot link body 3 and the pivot axis P4 with respect to the support 4 are located on the upper side of the vehicle body as shown in FIG. , The inclination axis is located on the inside of the vehicle body. Since the swing link bodies 2 and 3, the mounting bracket body 1 and the support body 4 constitute a quadruple link mechanism R, the swing axis cores P1 to P4 of the swing link bodies 2 and 3 are Since the swing link bodies 2 and 3 swing with respect to the mounting bracket body 1 due to the inclined shaft center, the chain changing wheel 7 and the tension wheel 8 rotate these chain shaft centers with the rotation of the chain sprocket S. The chain sprocket S is configured to move below the chain sprocket S in either the rotation axis center direction or the radial direction of the chain sprocket S while maintaining the attitude of the chain sprocket with respect to the position parallel or substantially parallel to the dynamic axis Z. It is. The first tension spring 11 of the torsion coil spring type, which is provided inside the portion of the mounting bracket body 1 that pivotally supports the mounting screw 10, is provided with a fork end portion E.
The supporting body 4 is urged to swing about the axis X by urging the mounting bracket body 1 to the side that swings down around the axis X with respect to the vehicle body F using the side as a reaction point. The chain C is configured to be tensioned via the transfer wheel 4 and the tension wheel 8. A torsion coil spring type second tension spring 12, which is provided inside a portion of the support 4 that pivotally supports the guide plate 5, is provided with a support 4
Is used as a reaction force member to oscillate the guide plate 5 so that the tension wheel 8 is moved relative to the support 4 by the shaft center Y.
And the chain changing wheel 7 is urged against the support 4 to the side that ascends and swings around the axis Y, and the tension wheel 8 and the chain changing wheel 7 are urged. The tension is applied to the chain C via the. In other words, the swinging operation of the quadruple link mechanism R causes the chain changing wheel 7 and the tension wheel 8 to move in both the axis direction and the radial direction of the rotation axis of the chain sprocket S, thereby changing the chain C into a plurality of chains. Sprocket S ...
When the chain C is hooked on any of the chain sprockets S, the tension spring 1
The chain C is tensioned and operated by the biasing force provided by the chain sprockets 1 and 12 to a tension suitable for driving the chain sprocket S.

As shown in FIGS. 1 and 3, one of the oscillating link members 2, 3 which is located on the inner side of the vehicle body has an inner connecting portion 13a. Is configured such that the inner wire 9a of the speed change operation wire 9 is tightened and connected by a set screw. The support 4 has an outer connecting portion 15, and the outer connecting portion 15 is provided with an outer holder 16.
And an outer wire 9b of the speed change operation wire 9
Are connected via the outer holder 16, and the position of the end of the outer wire with respect to the inner wire connecting portion 13 a can be adjusted by rotating the outer holder 16. When the derailleur is mounted on the vehicle body, the inner connecting portion 13
The inner connection portion 13a and the outer connection portion 15 are arranged and set so that a is located on the vehicle body rear side of the outer connection portion 15, and the shift operation wire 9 from the shift operation device is connected to the derailleur as shown in FIG. Directly introduced into the derailleur from the front side, and the outer wire 9
The end on the b side is connected to the outer connecting portion 15 and is supported by the support 4, and the end on the inner wire 9 a side is connected to the inner connecting portion 13 a to be connected to the swing link body 3. It is. A return spring 17 of a torsion coil spring type provided inside a portion of the support 4 to which the swing link body 3 is pivotally urged so as to relatively swing the swing link body 3 and the support body 4. By doing so, the support 4 is urged toward the outside of the vehicle body with respect to the mounting bracket 1 to apply an automatic return force to the chain changing wheel 7, and the slack operation of the shift operation wire 9 is performed. Accordingly, the chain changing wheel 7 is configured to automatically return to the operation position for setting the chain C on the chain sprocket S on the outermost side of the vehicle body. In other words, when the speed change operation wire 9 is pulled, the speed change operation wire 9 operates so that the swing link body 3 swings inward with respect to the mounting bracket body 1 to the inside of the vehicle body. Moves to the inside of the vehicle body and switches the chain C from the chain sprocket S, which had been hung before the operation, to the chain sprocket S on the large diameter side inside the vehicle body. When the speed change operation wire 9 is loosened, the speed change operation wire 9 operates to return the return spring 17 so as to swing the swing link body 3 to the outside of the vehicle body with respect to the mounting bracket body 1, and the chain hook The change wheel 7 and the tension wheel 8 have moved to the outside of the vehicle body, and the chain sprocket S on the chain C before operation.
The change operation is performed on the chain sprocket S on the smaller diameter side on the outer side of the vehicle body.

According to the above configuration, the vehicle body side of the outer wire 9b of the speed change operation wire 9 is fixed by the chain stay portion of the vehicle body frame F via the holder 17, and the end of the outer wire 9b on the derailleur side is connected to the outer connecting portion 15. The outer wire 9 is connected to the support 4 via
b acts as a damper on the derailleur, with the location secured to the body frame F as a reaction point and the connection location of the support 4 acting on the derailleur, and the derailleur swings due to the running vibration of the chain C and the chain vibration. Axis X of the mounting bracket body 1 with respect to the vehicle body caused by the
The vibration of the derailleur with respect to the vehicle body due to the swinging around is suppressed, and the increase in the amplitude of the chain C is suppressed by suppressing the vibration.

FIG. 4 shows a rear derailleur according to another embodiment. The rear derailleur is provided with an inner connecting portion 13a on the mounting bracket 1 and an outer connecting portion 15 on the support 4. In a state where the derailleur is assembled to the vehicle body, by setting the arrangement of the connecting portions 13a and 15 so that the inner connecting portion 13a is located on the rear side of the outer connecting portion 15 in the vehicle body, a shift from the speed change operating device is performed. The operation wire 9 is directly introduced into the derailleur from the front side of the derailleur, and the end of the speed change operation wire 9 on the outer wire 9b side is connected to the outer connecting portion 15 to be supported by the support 4 and the inner wire 9a side. The end is connected to the inner bracket 13 by connecting to the inner connecting portion 13a. When the pulling operation of the shift operation wire 9 is performed, the inner wire 9a protruding from the outer wire 9b toward the inner connecting portion 13a.
The operation wire 9 is operated such that the operation wire 9 swings the swing link bodies 2 and 3 with respect to the mounting bracket body 1 toward the inside of the vehicle body, and the chain change wheel 7 and the tension wheel 8 are operated. Is moved to the inside of the vehicle body, and the chain C is shifted from the chain sprocket S, which had been hung before the operation, to the chain sprocket S on the large diameter side inside the vehicle body. When the shift operation wire 9 is loosened, the length of the inner wire 9a protruding from the outer wire 9b toward the inner connecting portion 13a becomes longer than before the operation, and the operation wire 9 performs the return action of the return spring 17 to perform the return operation. The swing link bodies 2 and 3 are operated so as to swing to the outside of the vehicle body with respect to the mounting bracket body 1, and the chain changing wheel 7 and the tension wheel 8 move to the outside of the vehicle body so that the chain C is hung before the operation. The chain sprocket S is configured to be switched to a chain sprocket S on the smaller diameter side outside the vehicle body than the chain sprocket S.

FIG. 5 shows a rear derailleur of still another embodiment, in which an inner linking portion 13a is provided on the rocking link body 3 on the inner side of the vehicle body, and an outer connecting portion 15 is provided on the rocking link body 2 on the outer side of the vehicle body. It is prepared. In a state where the derailleur is assembled to the vehicle body, the connecting portions 13a are so positioned that the inner connecting portion 13a is located on the rear side of the outer connecting portion 15 in the vehicle body.
By setting the arrangement of a and 15, the shift operation wire 9 from the shift operation device is directly introduced into the derailleur from the front side of the derailleur, and the end of the shift operation wire 9 on the outer wire 9b side is connected to the outer connecting portion. 15 and supported by the oscillating link 2, and the end on the inner wire 9 a side is connected to the inner connecting portion 13 a and the oscillating link 3
, The transmission operation wire 9 is interlocked with the quadruple link mechanism R. Note that the outer connecting portion may be provided on the swing link body, and the inner connecting portion may be provided on the mounting bracket body.

According to each of the above embodiments, the vehicle body side of the outer wire 9b of the speed change operation wire 9 is fixed by the chain stay portion of the vehicle body frame F via the holder 18, and the derailleur side end of the outer wire 9b is connected to the outer side. When the outer wire 9b is connected to the support 4 or the oscillating link 2 via the portion 15 and the location where the outer wire 9b is fixed by the vehicle body frame F is set as a reaction point, the connection between the support 4 and the oscillating link 2 is derailleured. Acts as a point of action on the derailleur, causing the derailleur to oscillate around the axis X with respect to the vehicle body of the mounting bracket body 1 due to the vibration of the chain C due to the running vibration of the chain C. The vibration of the derailleur with respect to the vehicle body is suppressed, and the increase in the amplitude of the chain C is suppressed by suppressing the vibration. That.

As in the above-described embodiment, the chain change wheel 7 and the tension wheel 8 are connected to the chain sprocket S during the shifting operation.
When the oscillating axes P1 and P2 of the oscillating links 2 and 3 with respect to the mounting bracket body 1 are formed on the inclined axis so as to move in the radial direction in addition to the direction of the rotational axis, Since the inner wire portion that is exposed and reaches the inner connecting portion 13a is configured so as not to be easily broken with respect to the outer wire 9b, the speed change operating wire 9 extends forward from the outer connecting portion 15 while facing upward. As a result, it is advantageous that the overhang of the speed change wire 9 to the lateral outside of the vehicle body can be suppressed. However, the chain change wheel 7 and the tension wheel 8 move only in the rotation axis direction of the chain sprocket S during the speed change operation. And the pivot axis P of the pivot link bodies 2 and 3 with respect to the mounting bracket body 1.
1 and P2 may be formed on a vertical axis core.

The connection portion of the speed change operation wire to the inner wire, that is, the inner connection portion may be provided in the swing link body 2 located outside the vehicle body. In this case, the configuration is such that the operation wire swings the swinging link body to the outside of the vehicle body at the time of the pulling operation due to the wire arrangement, etc., and the chain changing wheel is configured to return to the vehicle body inside by the return spring. May be.

Further, when the inner connecting portion 13a and the outer connecting portion 15 are provided on the oscillating link bodies 2, 3 or the mounting bracket body 1 or the support body 4, the oscillating link body, the mounting bracket body as shown in the above embodiments. In addition to being directly connected to each of the supports, the present invention may be implemented by attaching to a swing link body, a mounting bracket body, or a member that is connected to the support so as to operate integrally therewith. The tip is simply referred to as a swing link body, a mounting bracket body 1 or a support body 4.

In practicing the present invention, the first tension spring 11 may be omitted, and tension may be applied to the chain C only by the second tension spring 12. In this case, when the derailleur is used, the mounting bracket 1 is configured to be immovably fixed to the body frame F, or
When the derailleur is used, the mounting bracket body 1 is immovably connected to the vehicle body frame F due to the tension of the chain C. It is configured to be in a connected state where it swings to the rear of the vehicle body from the time of use so as to facilitate the operation.

In order to enable the mounting bracket body 1 to be mounted on the rear wheel mounting fork end portion E, a direct mounting type using the mounting screws 10 as in the above embodiment is adopted. A bracket type that is fastened to the rear wheel together with the part E may be adopted.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of the entire rear derailleur.

FIG. 2 is a vertical rear view of a rear derailleur operation unit.

FIG. 3 is a plan view of a rear derailleur operation unit.

FIG. 4 is a plan view of an operation section of another rear derailleur.

FIG. 5 is a plan view of an operation unit of another rear derailleur.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting bracket body 4 Support body 7 Chain change ring 9 Speed change operation wire 9a Inner wire 9b Outer wire 13a Inner connection part 15 Outer connection part F Body R Quadruple link mechanism S Chain sprocket

Claims (1)

(57) [Claims] 1. A swingably mounted body (F) of a bicycle.
The mounting bracket body (1) to be mounted and the mounting bracket (1) are tensioned to the chain (C).
Tension spring that urges in the swing direction that can apply
(11), a support (4) for supporting the chain transfer wheel (7), and the mounting bracket (1) are connected to the vehicle body (F).
The support (4) is mounted on the mounting bracket
(1) The support is set in a state of being located further forward of the vehicle body.
A swing connecting the (4) and the mounting bracket body (1).
A moving link body and the support (4) or the swing link body,
Connects the outer wire (9b) of the speed change operation wire (9)
Outer connecting portion (15), and the swing link body or the mounting bracket body
(1) The mounting bracket body (1) is mounted on the vehicle body.
(F) and connected to the outer connecting portion (15).
The shift operation is provided at a position further rearward of the vehicle body.
A connecting the inner wire (9a) of the working wire (9)
An inner connecting portion (13a), the mounting bracket (1), the support (4) and
And a four-link mechanism (R) comprising the swing link body.
The chain change wheel (7) is attached to the chain by moving operation.
Chain sprocket (S) to bracket body (1)
Bicycle bicycle configured to move in the direction of the rotation axis of the bicycle.
Yadirella.