JPH05170167A - Rear derailer for bicycle - Google Patents

Abstract

PURPOSE:To reduce action resistance by devising the fitting position of a fitting bracket fitted with a supporter pivotally supporting a chain re-engaging ring and a tension ring via a pair of rocking link bodies to a vehicle body and the connecting position of a speed change action wire. CONSTITUTION:A supporter 4 is connected to a fitting bracket body 1 via a pair of rocking link bodies 2, 3, and a chain re-engaging ring 7 and a tension ring 8 are fitted to a guide plate 5 supported by the supporter 4. The fitting bracket body 1 is fixed to the rear wheel fitting fork end section E of a vehicle body frame F rockably around the axis X with a fitting screw, and it is rockingly excited by a tension spring 11. An outer connection section 15 connecting the outer wire 9b of a speed change action wire 9 is provided on the fitting bracket body 1, an inner connection section 13a connecting an inner wire 9a is provided on the rocking link body 3 located behind a vehicle body of the outer connection section 15, and the speed change action resistance is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mounting bracket body,
A support for supporting the chain changing wheel and tension wheel,
A rocking link body that connects the support body and the mounting bracket body with the support body positioned on the front side of the vehicle body with respect to the mounting bracket body when the mounting bracket body is connected to the vehicle body; By the swinging operation of the four-link mechanism including the mounting bracket body, the support body, and the swinging link body, the chain changing wheel is moved in the direction of the rotation axis of the chain sprocket with respect to the mounting bracket body. A tension is applied to the chain via the chain changing wheel and the tension wheel by swinging and biasing the mounting bracket body connected to the vehicle body with respect to the vehicle body about a lateral axis of the vehicle body. The first tension spring and the tension wheel are oscillated and urged with respect to the support body to move the tension wheel. Second to tensioning the chain and
The present invention relates to a bicycle rear derailleur equipped with a tension spring.

[0002]

2. Description of the Related Art In the above-mentioned rear derailleur, conventionally, as disclosed in, for example, Japanese Utility Model Laid-Open No. 56-134297, a gear shift operation wire is bent on the rear side of the derailleur to change its direction from the rear side of the vehicle body to the front side thereof. By arranging the wires in this way, it is possible to guide the gear shift operation wire from the gear shift operation device located on the vehicle body front side of the derailleur to the derailleur and interlock it with the four-link mechanism.
The derailleur could be operated by simply connecting the speed change operation wire to the quadruple link mechanism so that the chain changing wheel moves in the direction of the rotation axis of the chain sprocket with a relatively simple structure.

[0003]

Conventionally, since the speed change operation wire bends with a small radius near the derailleur, and the outer wire for guiding the inner wire is indispensable at the wire bending portion, it is caused by the operation wire. The resulting operational resistance was relatively large and the gear shifting operation was often heavy. It is an object of the present invention to provide a rear derailleur which can be used without modification on the vehicle body side, yet has a relatively simple structure and can be operated lightly.

[0004]

In order to achieve the object, a bicycle rear derailleur according to the present invention is the same as the one described at the beginning, wherein the fork end portion for mounting the rear wheel of the vehicle body is attached to the mounting bracket body. An outer connecting portion for connecting an outer wire of the gear shift operation wire to the mounting bracket body, and an inner connecting portion for connecting an inner wire of the gear shift operation wire to the vehicle body. It is characterized in that the swing link body is provided in a state of being positioned on the vehicle body rear side of the outer coupling portion in a coupled state. In carrying out the present invention, the outer connecting portion is disposed near the swing axis of the mounting bracket body, or the outer wire is supported so that the gear shift operation wire extends toward the front of the vehicle body while facing upward of the vehicle body. It is advantageous as follows to form the outer connecting portion or to make the swing axis of the swing link body an inclined axis.

[0005]

By forming the connecting portion of the mounting bracket body to the same specifications as the connecting portion of the conventional derailleur, the mounting bracket body can be assembled to the vehicle body without any special modification on the vehicle body side. It will be possible. Even if the speed change operation wire is arranged directly from the front of the derailleur to the derailleur, the outer wire of the operation wire is attached by the outer connection part due to the above-mentioned arrangement relationship between the outer connection part and the inner connection part. When the gear change operation wire is operated by connecting the inner wire to the swing link body through the inner connection part while connecting to the bracket body, the quadruple link mechanism swings in response to this wire operation and the chain change The wheel can be moved in the direction of the axis of rotation of the chain sprocket. Moreover, due to the movement of the rocking link body or the support body with respect to the mounting bracket body due to the gear shifting operation, as in the case where the gear shift operation wire is supported by the mounting bracket body and is supported by the rocking link body or the support body. Thus, the gear shift operation can be performed while avoiding the swinging of the operation wire. When the outer connecting part is placed near the swing axis of the mounting bracket body, the mounting bracket body swings with respect to the vehicle body in response to the gear shifting operation, and when the outer connecting part moves together and the gear shifting operation wire swings. , The arm length from the wobbling center of the outer connecting portion is relatively short so that the wire movement is relatively small. When the swing link body swings around the tilt axis with respect to the mounting bracket body,
The gear shift operation wire extends from the outer connecting portion toward the front side of the vehicle body and at the same time extends toward the vehicle body upward direction,
It is possible to make the shift operation wire relatively hard to come out to the lateral outside of the vehicle body. When the outer connecting portion is configured to support the gear shifting operation wire so as to extend forward while facing upward, when the gear shifting operation wire is guided along the chain stay portion of the body frame from the front of the derailleur. While arranging the wire in the pulled state, while preventing bending of a small radius in the speed change operation wire,
Introduce the shift operation wire along the back fork of the vehicle body frame into the derailleur from above, and adopt the wire arrangement in the up pulled state so that the shift operation wire does not bend at a small radius. Will be possible.

[0006]

The shift operation wire can be moved and operated directly from the front side of the derailleur while the shift wheel can be moved and operated with a simple structure in which the shift operation wire is connected to the constituent members of the four-link mechanism. The gear shift operation wire is arranged so as not to bend as much as possible and to prevent it from swinging as much as possible by interlocking with the quadruple link mechanism. By reducing the wire resistance, we were able to shift gears lightly. Moreover, it can be advantageously used without requiring any modification for mounting on the vehicle body side. By locating the outer connecting part near the swing axis of the mounting bracket body, the runout movement of the gear shift operation wire caused by the swinging movement of the mounting bracket body is also suppressed, and this aspect also further reduces the gear shift operation force. You can If the swinging link body is made to swing around the tilt axis with respect to the mounting bracket body, it is possible to suppress the margin of the shift operation wire to the lateral outside of the vehicle body and to arrange the wire advantageously in terms of safety and the like. become. If the gear shifting operation wire can be supported diagonally by the outer connecting portion, it can be used in a state where the gear shifting operation can be performed lightly not only for the vehicle body formed for forward pulling but also for the vehicle body formed for upward pulling. In addition, it has an advantage of wide application.

[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 link bodies 2 and 3.
The chain changing wheel 7 and the tension wheel 8 are attached to the guide plate 5 supported by the support body 4 so that the support body 4 is located on the vehicle body front side of the mounting bracket body 1. Attached to the rear frame drive chain sprocket S supported by the vehicle body frame F.
To act on the chain C, and by operating the shift operating wire 9 operated by a shift operating device (not shown), the chain C with respect to the sprocket S.
The rear derailleur for bicycles is configured so that it can be replaced.

That is, the mounting bracket body 1 swings around the lateral axis X of the vehicle body to the rear wheel mounting fork end portion E of the vehicle body frame F by the mounting screw 10 as shown in FIG. It is configured to be connected to the vehicle body by being clamped so as to be movable. By connecting the bracket bodies, 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 vehicle body frame F and the guide plate. 5, the swing axis Y of the swing sprocket S is parallel or substantially parallel to the swing axis Z of the chain sprocket S, and the swing axis P1 and the support of the swing link body 2 with respect to the mounting bracket body 1 are supported. Pivot axis P2 with respect to the body 4, and pivot axis P3 with respect to the mounting bracket body 1 of the swing link body 3
Also, the swing axis P4 with respect to the support body 4 is configured so as to be an inclined axis located closer to the inside of the vehicle as it goes toward the upper side of the vehicle as shown in FIG. The swing link bodies 2, 3, the mounting bracket body 1, and the support body 4 constitute a four-link mechanism R, and the swing axis cores P1 to P4 of the swing link bodies 2, 3 are the tilt shafts. Because of the core, as the swing link bodies 2 and 3 swing with respect to the mounting bracket body 1, the chain changing wheel 7 and the tension wheel 8 have their rotation axes centered around the rotation axis of the chain sprocket S. It is configured to move below the chain sprocket S either in the axial direction of the rotation axis of the chain sprocket S or in the radial direction while maintaining the posture of the chain sprocket S parallel to or substantially parallel to the core Z. .. Mounting screw 10 for mounting bracket body 1
A first tension spring 11 of a torsion coil spring type, which is internally installed in a portion that pivotally supports the mounting bracket body 1 with respect to the vehicle body F around the axis X, with the fork end portion E side as a reaction force point. By biasing the support 4 toward the side of swinging downward, the support body 4 is swingably biased around the swing axis X,
Tension is applied to the chain C via the chain changing wheel 4 and the tension wheel 8. A second tension spring 12 of a torsion coil spring type, which is internally provided in a portion of the support body 4 that pivotally supports the guide plate 5,
By swinging and biasing the guide plate 5 by using the support body 4 as a reaction force member, the tension wheel 8 is biased toward the side where the tension wheel 8 descends and swings around the axis Y with respect to the support body 4, and the chain is changed over. The wheel 7 is biased toward the support 4 so as to rise and swing around the axis Y, and tension is applied to the chain C via the tension wheel 8 and the chain changing wheel 7. .. That is, by operating the quadruple link mechanism R so as to oscillate, the chain changing wheel 7 and the tension wheel 8 move both in the direction of the rotation axis of the chain sprocket S and in the radial direction, and a plurality of chains C are provided. The chain sprocket S can be driven by one of the chain sprockets S .. The chain C can be driven by the urging force applied by the tension springs 11 and 12 regardless of which chain sprocket S is hooked. The tension is applied to the proper tension.

As shown in FIGS. 2 and 3, one end of the swing link body 2, which is located inside the vehicle body, of the swing link body 2, 3 on which the swing axis P3 is located. In addition, the operation arm 13 including the inner connecting portion 13a is continuously provided by integrally molding with the swing link body 3 by integrally molding, so that the swing link body 3 includes the inner connecting portion 13a. The inner wire 9a of the operation wire 9 is configured to be tightened and connected by the set screw 14. The mounting bracket body 1 is provided with an outer connecting portion 15, and the outer connecting portion 15 is provided with an outer holder 16 so that the outer wire 9b of the gear shift operation wire 9 is connected via the outer holder 16. In addition, the outer holder 16 can be rotated to adjust the position of the outer wire end portion with respect to the inner wire connecting portion 13a. When the derailleur is assembled to the vehicle body, the operation arm 13 projects rearward from the swing axis P3 so that the inner connecting portion 13a is located on the vehicle rear side of the outer connecting portion 15. Figure 1
As shown in FIG. 5, the gear shift operation wire 9 from the disguise operation device is directly introduced into the derailleur from the front side portion of the derailleur, and the end portion of the gear shift operation wire 9 on the outer wire 9b side is connected to the outer connecting portion 15 to attach the bracket body. 1, the end on the inner wire 9a side is connected to the inner connecting portion 13a and connected to the swing link body 3 so that the speed change operation wire 9 is interlocked with the four-link mechanism R. There is. A torsion coil spring type return spring 17 is internally provided in a portion of the support body 4 where the swing link body 3 is pivotally attached.
The support 3 is urged by urging the and
Is configured to be urged toward the side of the mounting bracket body 1 that moves to the outside of the vehicle body to apply an automatic restoring force to the chain changing wheel 7, and the chain changing wheel 9 is loosened when the chain changing wheel 9 is loosened. 7 is the chain sprocket S on the outermost side of the car body
It is configured to automatically return to the operating position where the chain C is hung on. That is, when the pulling operation of the shift operation wire 9 is performed, the inner wire 9a operates so that the swing link body 3 swings inwardly of the vehicle body with respect to the mounting bracket body 1, and the chain changing wheel 7 and the tension wheel 8 are moved. The chain sprocket S is moved to the inside of the vehicle body and the chain sprocket S is hung on the large diameter chain sprocket S on the inside of the vehicle from the chain sprocket S that was hung before the operation. When the gear change operation wire 9 is loosened, the inner wire 9a moves to the return spring 1
7 is operated to swing the swing link body 3 with respect to the mounting bracket body 1 to the outside of the vehicle body, and the chain changing wheel 7 and the tension wheel 8 are moved to the outside of the vehicle body to move the chain C. The chain sprocket S hanging before the operation is changed to the chain sprocket S on the small diameter side outside the vehicle body.

As shown in FIG. 5, the outer connecting portion 15 is located so as to be located at a portion of the mounting bracket body 1 that is close to the vehicle body lateral axis X which is the swing axis of the mounting bracket body 1. It is arranged at a location having a distance L between the central portion of the portion 15 in the wire penetrating direction and the lateral axis X of the vehicle body. That is, it is arranged at a position where the distance L = 25 to 35 mm. In other words, the chain C
Even if the mounting bracket body 1 swings around the axis X to swing the gear shift operating wire 9 together so that the tension of the mounting bracket body 1 becomes appropriate, the mounting bracket body 1 moves near the swinging axis X and the operating wire 9 moves. Since the arm length from the axis X as the center of the swing motion of the outer connecting portion 15 is relatively short, the shift operation wire 9 has relatively little swing.

In the mounting bracket body 1, as shown in FIG. 4, the tilt angle A of the swing axis P1 with respect to the vertical line C and the axis P5 of the outer connecting portion 15 in the longitudinal direction of the vehicle body are as described above. Each of the inclination angles B with respect to the swing axis P1 is set to an inclination angle A = 20 ° to 60 ° and an inclination angle B = 50 ° to 90 °, and the mounting bracket body 1 is attached to the vehicle body frame F.
The outer holder 16 is configured to extend from the outer connecting portion 15 toward both the upper direction and the front direction of the vehicle body in a neutral position in a range of swinging around the axis X with respect to the outer body. The connecting portion 15 is in a state in which the mounting bracket body 1 is connected to the rear wheel fork end portion E so that the derailleur is in a predetermined assembled state with respect to the vehicle body, and the mounting bracket body 1 is in a neutral range relative to the vehicle body swing range. Shift operation wire 9 in the position
Is configured to support the outer wire 9b via the outer holder 16 in a state of extending from the outer connecting portion 15 toward the upper side of the vehicle body and toward the front of the vehicle body.
That is, the outer wire 9 in the outer connecting portion 15
By the action of the mounting direction of b, as shown in FIG. 1, in addition to the wire arrangement in the front pulling state in which the shift operation wire 9 is introduced from the vehicle body front side to the derailleur along the chain stay portion of the vehicle body frame F, as shown in FIG. As shown in FIG. 5, the wire arrangement in the upward pulling state in which the gear shift operation wire 9 is introduced into the derailleur along the back fork portion of the vehicle body frame F can be adopted as necessary, and the forward pulling state and the upper pulling state can be adopted. No matter which wire arrangement is adopted, the wire through hole 15
Due to the inclination of a, the degree of bending of the speed change operation wire 9 is designed so as to avoid a significant increase in operation resistance due to bending of the operation wire.

[Other Embodiments] FIGS. 7 and 8 show a rear derailleur of another embodiment, in which the inner connecting portion 13a is located in the vicinity of or immediately after the swing axis P1 of the swing link body 2 in plan view. The operation arm 13 is formed so as to be located in the inner connection portion 13a and the inner connection portion 13a is connected to the outer connection portion 1
The rocking link body 3 is provided so as to be located immediately after or near the position 5. That is, the shift operation wire 9
Is connected to the swing link body 2 along the vehicle body front-rear direction in a straight line as much as possible in the vehicle body front-rear direction, and the operation force is transmitted with a very high transmission efficiency.

As in the above embodiment, the swing link bodies 2 and 3 are arranged so that the chain changing wheel 7 and the tension wheel 8 can move not only in the direction of the rotation axis of the chain sprocket S but also in the radial direction during a gear shift operation. When the pivot axes P1 and P2 with respect to the mounting bracket body 1 are formed on the tilt axis, the inner wire portion that is exposed from the outer wire 9b and reaches the inner connecting portion 13a is less likely to bend against the outer wire 9b. Because of the configuration, the shift operation wire 9
Extends forward from the outer connecting portion 15 while being directed upward, and as a result, it is advantageous that the shifting wire 9 can be restrained from protruding laterally outward of the vehicle body. The swing axis P of the swing link bodies 2 and 3 with respect to the mounting bracket body 1 is adjusted so that the wheel 8 moves only in the direction of the rotation axis center of the chain sprocket S.
You may implement by forming 1 and P2 on a vertical axis.

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 screw 10 as in the above embodiment is adopted. A bracket type may be adopted in which the portion E is fastened together with the rear wheel.
Therefore, these are collectively referred to as the connecting portion 10.

In constructing the outer connecting portion 15, the outer wire 9b is attached to the outer holder 16 as in the above embodiment.
In addition to being configured to be supported through, the wire insertion recess is provided, and the outer wire 9b is provided in the recess.
It is also possible to employ various supporting means such as directly inserting the outer wire holder to support the outer wire 9b by omitting the outer holder. Collectively.

It is also possible to provide the connecting portion of the shift operation wire with the inner wire, that is, the inner connecting portion in the swing link body 2 located outside the vehicle body. In this case, due to the arrangement of the wires, the operation wire is configured to swing the swing link body to the outside of the vehicle body when the pulling operation is performed, and the chain changing wheel is configured to return to the inside of the vehicle body by the return spring. You may.

Further, when the inner connecting portion 13a and the outer connecting portion 15 are provided in the swing link bodies 2 and 3 or the mounting bracket body 1, they are directly connected to the swing link body or the mounting bracket body as shown in the above embodiments. In addition to the installation, the swing link body or the mounting bracket body may be attached to a member connected so as to operate integrally with the swing link body or the mounting bracket body. It is called 1.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Side view of the entire rear derailleur

[Figure 2] Rear view of the rear derailleur operating section

FIG. 3 is a cross-sectional plan view of the rear derailleur operating unit.

FIG. 4 is a rear view of the mounting bracket body.

FIG. 5 is a side view of the mounting bracket body.

FIG. 6 is a side view showing another procedure for disposing the shift operation wire.

[Fig. 7] Side view of another rear derailleur as a whole

FIG. 8 is a cross-sectional plan view of an operation portion of another embodiment rear derailleur.

[Explanation of symbols]

 1 Mounting bracket body 4 Support body 7 Chain interlocking wheel 8 Tension wheel 9 Shift operation wire 9a Inner wire 9b Outer wire 10 Connecting part 11 First tension spring 12 Second tension spring 13a Inner connecting part 15 Outer connecting part 15a Speed changing wire Passage 16 Support C Chain E Rear wheel mounting fork end F Body P1, P2 Swing axis R Quad link mechanism S Chain sprocket X Body lateral axis

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[Procedure amendment]

[Submission date] March 12, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

Claims (4)

[Claims] 1. A mounting bracket body (1), a support body (4) for supporting a chain changing wheel (7) and a tension wheel (8), and the mounting bracket body (1) is a vehicle body (F).
Rocking to connect the support body (4) and the mounting bracket body (1) so that the support body (4) is positioned on the vehicle body front side of the mounting bracket body (1) in a state of being connected to the mounting bracket body (1). The chain changing wheel (7) is provided with a link body, and the chain changing wheel (7) is moved by the swing operation of a four-link mechanism (R) including the mounting bracket body (1), the support body (4) and the swing link body. The mounting bracket body (1) is connected to the vehicle body (F) and is attached to the vehicle body (F) so as to move in the direction of the rotation axis of the chain sprocket (S) with respect to the mounting bracket body (1). On the other hand, the lateral axis of the vehicle body (X)
A first tension spring (1) that applies a tension to the chain (C) through the chain interchanging wheel (7) and the tension wheel (8) by oscillating and urging around the chain.
1) and a second tension for imparting tension to the chain (C) via the tension wheel (8) by swingingly biasing the tension wheel (8) with respect to the support body (4). A bicycle rear derailleur having a spring (12), wherein the attachment bracket body (4) has a connecting portion (1) to a rear wheel attachment fork end portion (E) of the vehicle body (F).
0) and an outer connecting portion (15) for connecting an outer wire (9b) of the speed change operation wire (9) to the mounting bracket body (4), and an inner wire (9a) of the speed change operation wire (9). An inner connecting part (13a) connecting the mounting bracket body (1) to the vehicle body (F), and an inner connecting part (13a) for connecting the inner connecting part (13a) to the vehicle body (F). A bicycle rear derailleur for your body. 2. The bicycle rear derailleur according to claim 1, wherein the outer connecting portion (15) is located near the vehicle body lateral axis (X). 3. The swing shaft cores (P1), (P2) of the swing link body with respect to the mounting bracket body (4) are connected to the vehicle body (F) by the mounting bracket body (1). The rear derailleur for a bicycle according to claim 1, wherein the inclined decenter is located on the inner side of the vehicle body as it goes upward. 4. The shift operation wire extends forward from the outer connecting portion (15) and upward in the vehicle body while the mounting bracket body (1) is connected to the vehicle body (F). The bicycle rear derailleur according to claim 1, wherein a support portion (16) for supporting the outer wire (9b) is provided in the outer connection portion (15).