JPH05170168A - 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 the tension ring 8 is rockingly excited by a tension spring 12. An outer connection 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 and located behind the vehicle body of the outer connection section 15 is provided on the rocking link body 3, 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 force is applied to the chain via the tension wheel by disabling movement of the mounting bracket body with respect to the vehicle body when the rear derailleur is used and oscillating and biasing the tension wheel with respect to the support body. The present invention relates to a rear derailleur for a bicycle, which is provided with a tension spring for applying.

[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 lightly operated while suppressing the runout of the shift operation wire.

[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 chain changing wheel may be configured to move only in the axial center direction of the chain sprocket during a gear shift operation. The tilt axis is advantageous as follows.

[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. In addition, since the mounting bracket body supports the gear shift operation wire and the mounting bracket body does not move with respect to the vehicle body during the gear shift operation, the rocking link body or the support body supports the gear shift operation wire. Moreover, the gear shift operation can be performed while avoiding the operation wire swinging along with the gear shift operation as in the case where the mounting bracket body moves with respect to the vehicle body. When the swing link body is made to swing about 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.

[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 prevented from bending as much as possible by making the gear shift operation wire sway and the wobbling movement of the gear shift operation wire due to the gear shift operation do not occur. By arranging so as not to swing, the bending of the operation wire was suppressed and the wire resistance was reduced from both sides of the steady rest, enabling a light speed shift operation. Moreover, it can be advantageously used without requiring any modification for mounting on the vehicle body side. 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.

[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 is connected to the vehicle body by fastening and fixing it to the rear wheel mounting fork end portion E of the vehicle body frame F with the mounting screw 10 as shown in FIG. 2 provided on one end side. In addition to the above structure, in this connection state, it does not move with respect to the vehicle body frame F regardless of the gear shifting operation. By connecting the bracket bodies, the derailleur is assembled to the vehicle body so that it can be used. In this assembled state, the swing axis Y of the guide plate 5 with respect to the support body 4 rotates the chain sprocket S. The mounting bracket body 1 for the swing link body 2 is parallel or substantially parallel to the axis Z.
With respect to the rocking axis P1 with respect to the support body 4, rocking axis core P2 with respect to the support body 4, rocking axis core P3 with respect to the mounting bracket body 1 of the rocking link body 3 and rocking axis core P4 with respect to the support body 4.
As shown in FIG. 2, each of them has an inclined axis that is located on the inner side of the vehicle body toward the upper side of the vehicle body. 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 P of the swing link bodies 2, 3 are formed.
Since 4 is the tilt axis, the swing link body 2,
As the 3 swings with respect to the mounting bracket body 1, the chain interchanging wheel 7 and the tension wheel 8 are paired such that their rotation axes are parallel or substantially parallel to the rotation axis Z of the chain sprocket S. While the posture of the chain sprocket is maintained, the lower portion of the chain sprocket S is configured to move in either the axial direction of the rotation axis of the chain sprocket S or the radial direction. A torsion coil spring type tension spring 12 internally provided in a portion of the support body 4 that pivotally supports the guide plate 5 swings and biases the guide plate 5 using the support body 4 as a reaction member, so that the tension is increased. The wheel 8 is urged toward the support body 4 so as to swing downward around the axis Y, and the chain changing wheel 7 is moved upward toward the support 4 around the axis Y. The force is applied to apply tension to the chain C through the tension wheel 8 and the chain hooking wheel 7.
That is, by operating the four-link mechanism R so as to swing, the chain changing wheel 7 and the tension wheel 8 are operated.
Moves in both the axial direction and the radial direction of the chain sprocket S to change the chain C into one of a plurality of chain sprockets S ..., and whichever chain sprocket S the chain C hangs on, By the urging force applied by the tension spring 12, the chain C is operated in a tension state suitable for driving the chain sprocket S.

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 as shown in FIG.
5 is provided with an outer holder 16, is configured to connect the outer wire 9b of the gear shift operation wire 9 via the outer holder 16, and the inner wire at the end of the outer wire is rotated by rotating the outer holder 16. The position of the wire connecting portion 13a can be adjusted. When the derailleur is assembled to the vehicle body, the inner connecting portion 13a is connected to the outer connecting portion 1
5, the operation arm 13 is located on the rear side of the vehicle body.
Is configured so as to project rearward from the swing axis P3 toward the vehicle body, and as shown in FIG. 1, the speed change operation wire 9 from the speed change operation device is directly introduced into the derailleur from a front side portion of the derailleur. The outer wire 9b side end of 9 is connected to the outer connecting part 15 to be supported by the mounting bracket body 1, and the inner wire 9a side end is connected to the inner connecting part 13a to form the swing link body 3
The gear shift operation wire 9 is configured to be interlocked with the quadruple link mechanism R by being connected to. A torsion coil spring type return spring 17, which is internally provided in a portion of the support body 4 where the swing link body 3 is pivotally attached, urges the swing link body 3 and the support body 4 to relatively swing. By doing so, the support body 3 is urged toward the side of the mounting bracket body 1 that moves to the outside of the vehicle body, and an automatic restoring force is applied to the chain interchanging wheel 7, so that the shift operation wire 9 is loosened. Accordingly, the chain changing wheel 7 is automatically returned to the operation position where the chain C is hung on the chain sprocket S located on the outermost side of the vehicle body. That is, the shift operation wire 9
When the pulling operation is performed, the inner wire 9a operates so that the swing link body 3 swings inside the vehicle body with respect to the mounting bracket body 1, and the chain changing wheel 7 and the tension wheel 8 move inside the vehicle body. The chain C is changed to the chain sprocket S on the large diameter side inside the vehicle body from the chain sprocket S that was hung before the operation. When the gear shift operation wire 9 is loosened, the inner wire 9a operates to return the return spring 17 so that the swing link body 3 swings to the outside of the vehicle body with respect to the mounting bracket body 1, and the chain is changed. The wheels 7 and the tension wheels 8 move to the outside of the vehicle body, and the chain sprocket S, which has been hanging before the operation of the chain C, is changed over to the chain sprocket S on the smaller diameter side outside the vehicle body.

In the mounting bracket body 1, as shown in FIG. 4, the inclination 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 front-back direction of the vehicle body. 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 so as to extend from the outer joint portion 15 in both the upper direction and the front direction of the vehicle body in a state of being assembled to the outer joint 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 speed change operation wire 9 is directed upward from the outer connection portion 15 to the vehicle body front side. The outer wire 9b is configured to be supported in a state of extending toward. That is, due to the action of the outer connecting portion 15 in the mounting direction of the outer wire 9b, the gear shift operation wire 9 is moved from the vehicle body front side to the vehicle body frame F as shown in FIG.
In addition to the wire arrangement in the pre-pulled state of being introduced into the derailleur along the chain stay portion of the vehicle, the pull-up state in which the shift operation wire 9 is introduced into the derailleur along the back fork portion of the vehicle body frame F as shown in FIG. In order to be able to adopt the wire arrangement at the front end as well as when the wire arrangement is set to either the front pulling state or the upper pulling state, the gear shifting operation is performed due to the mounting orientation of the outer connection 15. The degree of bending of the wire 9 is designed so that a significant increase in operating resistance due to bending of the operating wire can be avoided.

[Other Embodiments] FIGS. 7 and 8 show a rear derailleur according to another embodiment, in which the inner connecting portion 13a is located immediately behind the swing axis P1 of the swing link body 2 or in the vicinity thereof 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 inclined 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 to the rear wheel mounting fork end portion E, the direct mounting type using the mounting screw 10 as in the above embodiment is adopted, and the rear wheel mounting fork end is also used. 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.

The connection portion of the shift 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, 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, in order to provide the inner connecting portion 13a and the outer connecting portion 15 in the swing link bodies 2 and 3 or the mounting bracket body 1, the swing link body, the mounting bracket body and the support body are respectively provided as shown in the above-mentioned embodiments. In addition to being directly connected to the mounting bracket body, the swinging link body or the mounting bracket body may be attached to a member connected to the mounting bracket body so as to operate integrally therewith. Alternatively, they are collectively referred to as rocking link bodies.

The mounting bracket body 1 is constructed such that it is non-rotatably assembled to the fork end portion E of the vehicle body frame F as in the above-described embodiment, and the tension of the chain C is used by the tension of the chain C when the derailleur is used. Although it is in an immovable connection state with the fork end portion E of F,
When the tension applied by the chain C is released when the rear wheels are attached or detached, the connection state is such that the wheels swing to the rear side of the vehicle than when used so that the wheels can be easily attached and detached. You may. In short, it is sufficient that the derailleur does not move with respect to the body frame F at least when the derailleur is used.

It should be noted that reference numerals are added to 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 4 Support 7 Chain Changing Wheel 8 Tension Wheel 9 Speed Change Wire 9a Inner Wire 9b Outer Wire 10 Connection Part 12 Tension Spring 13a Inner Connection Part 15 Outer Connection Part C Chain E Rear Wheel Attachment Fork End Part F Body R Quad link mechanism S Chain sprocket

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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]

Claims (2)

[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. It is configured to move in the direction of the rotation axis of the chain sprocket (S) with respect to the mounting bracket body (1), and disables movement of the mounting bracket body (1) with respect to the vehicle body (F) when the rear derailleur is used, A tension spring (1) that applies a 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 comprising: 2), wherein the attachment bracket body (4) has a connection 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 gear shift operation wire (9) to the mounting bracket body (1), and an inner wire (9a) of the gear shift 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 swinging shaft cores (P1), (P2) of the swinging link body with respect to the mounting bracket body (1) 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.