JP2926668B2 - Rear derailleur for bicycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting bracket which can be fixedly mounted on a bicycle body, a support for supporting a chain changing wheel and a tension wheel, and the support and the mounting bracket. A swing link body to be connected, and a four-link mechanism including the mounting bracket body, the support body, and the swing link body swings, so that the chain changing wheel is attached to the mounting bracket body. The tension is configured to be movable along the rotation axis of the chain sprocket, and the tension wheel is oscillatingly biased against the support to apply tension to the chain via the tension wheel. The present invention relates to a bicycle rear derailleur having a spring.

[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 front side of the vehicle body than the derailleur can be guided to the derailleur and linked with the four-link mechanism,
The derailleur can be operated relatively simply by connecting the speed change operation wire to the quadruple link mechanism so that the chain engaging wheel moves in the direction of the rotation axis of the chain sprocket.

[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 which can be used without any modification on the vehicle body side, is relatively simple in structure, and can be operated lightly while suppressing deflection of a speed change operation wire.

[0004]

In order to achieve the object, in a bicycle rear derailleur according to the present invention, an outer receiving portion which comes into contact with an end of an outer wire of a speed change operation wire is described. The mounting bracket body, the mounting bracket body is mounted on the vehicle body, the chain is the chain sprocket,
When the chain rear wheel and the bicycle rear derailleur hung on the tension wheel are in use, the support is disposed on the vehicle body front side relative to the mounting bracket body, and the support is disposed. An operation arm projecting rearward of the vehicle body from the outer receiving portion is provided on the swing link body, and an inner wire of the speed change operation wire is connected to the swing link body via the operation arm. Features. In carrying out the present invention, the chain changing wheel may be configured to move only in the axial direction of the chain sprocket at the time of gear shifting operation, but the swing shaft center of the swing link body with respect to the mounting bracket body may be changed. The outer receiving portion is provided with a support portion that supports the outer wire so that the transmission wire extends upward from the outer receiving portion in the front direction of the vehicle from the outer receiving portion. If an inner connecting part is provided in the protruding part or an outer receiving part is provided behind the vehicle body from the bracket connecting part of the bracket body,
It is advantageous as follows.

[0005]

[Function] By forming the connection portion of the mounting bracket body to the same specification as the connection portion of the conventional derailleur, the mounting bracket body can be assembled to the vehicle body without adding special modification on the vehicle body side. Will be possible. Even if the speed change operation wire is arranged from the front of the derailleur directly to the derailleur, the outer wire of the operation wire is attached to the outer support portion by the outer bracket due to the above-described arrangement relationship between the outer support portion and the operation arm. The inner wire is connected to the swing link body via an operation arm projecting rearward from the outer receiving portion to the rear of the vehicle body while being brought into contact with the body. The link mechanism swings,
While the chain transfer wheel moves in the direction along the rotation axis of the chain sprocket, it is possible to eliminate a curved portion where the inner wire frictionally slides with the outer wire. In addition, since the speed change operation wire is supported by the mounting bracket and the mounting bracket does not move relative to the vehicle body during the speed change operation, the speed change operation wire is supported by the swing link or the support. In addition, the shift operation can be performed while avoiding the operation wire swinging with the shift operation as in the case where the mounting bracket body moves relative to the vehicle body. When the swing link body swings around the inclined axis with respect to the mounting bracket body when the bicycle rear derailleur is in the use state, the speed change operation wire is directed toward the front of the vehicle body from the outer receiving portion. As a result, the speed change operation wire can be relatively hardly protruded to the lateral outside of the vehicle body. When the bicycle rear derailleur is in the use state, the bicycle rear derailleur is provided with a support portion that supports the speed change operation wire in a state of extending forward while facing upward, and the speed change operation wire is configured to be a chain stay portion of the vehicle body frame. When laying the wire in a forward-pulled state where it is introduced into the derailleur from the front in line with the derailleur, the speed-change operation wire should not be bent along the back fork of the vehicle body frame while preventing the bend with a small radius from occurring. In addition, it is possible to adopt a wire arrangement in an upwardly pulled state in which the wire is introduced into the derailleur from above, and a bend of a small radius does not occur in the speed change operation wire. When the inner wire is connected to an inner connecting portion provided in a region protruding rearward of the vehicle body from the outer receiving portion of the operation arm when the bicycle rear derailleur is in the use state,
It is possible to arrange a wire that does not generate a small radius bent portion where the inner wire of the speed change operation wire slides with respect to the outer wire. Further, when the bicycle rear derailleur is in the use state, the mounting bracket body is generally located at a position behind the vehicle body with respect to the vehicle body horizontal axis, so that the outer receiving portion is provided here. It is possible to provide the outer receiving portion without significantly changing the shape of the mounting bracket.

[0006]

According to the present invention, the shift operation wire can be moved and operated with a simple structure in which the shift operation wire is simply connected to the constituent members of the quadruple link mechanism. And interlocked with the four-link mechanism, and since the swing operation of the shift operation wire accompanying the shift operation does not occur, the shift operation wire is prevented from bending as much as possible, and regardless of the shift operation. It is arranged so that it does not swing, and the bending of the part where the inner wire of the operation wire slides with respect to the outer wire is suppressed and the wire resistance is reduced from both sides of the anti-sway, so that the speed change operation can be performed lightly. I was able to. In addition, it can be used advantageously without requiring any modification for mounting on the vehicle body side. When the swing link body is made to swing about the inclined axis with respect to the mounting bracket body, it is possible to reduce the protrusion of the speed change operation wire to the lateral outside of the vehicle body and to advantageously arrange the wire in terms of safety and the like. become.
When the oblique support of the speed change operation wire by the outer receiving portion is enabled, the shift operation wire can be used in a state where the speed change operation can be performed lightly in the case of the vehicle body formed for upward pulling in addition to the vehicle body formed for front pulling. In addition, it has a wide range of advantages.

[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 mounted on a guide plate 5 supported by the support 4 so that the support 4 is positioned forward of the mounting bracket 1 on the vehicle body. And a chain change wheel 7 and a tension wheel 8 below the rear wheel drive chain sprocket S supported by the body frame F.
Is acted on the chain C, and is operated by a speed change operation wire 9 operated by a speed change operation device (not shown), so that the chain C for the sprockets S.
The rear derailleur for bicycles is configured so as to change the vehicle.

That is, the mounting bracket body 1 is connected to the vehicle body by being fixedly fastened to the rear wheel mounting fork end portion E by a mounting screw 10 provided at one end side as shown in FIG. In addition, in this connection state, it is configured not to move with respect to the vehicle body frame F regardless of the speed change operation. Hereinafter, in the present specification, as shown in FIG. 1, the mounting bracket body 1 is mounted on the vehicle body frame F, and the chain C is hung on the chain sprocket S, the chain changing wheel 7, and the tension wheel 8. The rear derailleur for a bicycle in use will be described. By connecting the bracket body, the derailleur is assembled to the vehicle body so that the derailleur 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. Parallel or almost parallel to the axis Z,
The swing axis P1 of the swing link body 2 with respect to the mounting bracket body 1 and the swing axis P2 of the support body 4 with respect to the swing bracket P1, and the swing axis P3 of the swing link body 3 with respect to the mounting bracket body 1 and the support body 4. As shown in FIG. 2, each of the pivot axes P <b> 4 is configured to be an inclined axis located closer to the inside of the vehicle body toward the upper side of the vehicle body.
Oscillating link bodies 2 and 3, mounting bracket body 1, support body 4
Constitutes a quadruple link mechanism R, and the swing shafts P1 to P4 of the swing links 2 and 3 are the inclined shafts. With the swinging movement with respect to the body 1, the chain changing wheel 7
And the tension wheel 8 moves the rotation axis of the chain sprocket S below the chain sprocket S while maintaining the attitude of the rotation axis of the chain sprocket S parallel or substantially parallel to the rotation axis Z of the chain sprocket S. It is configured to move in both the direction along the core Z and the radial direction. A tension spring 12 of a torsion coil spring type, which is provided inside a portion of the support 4 that pivotally supports the guide plate 5, urges the guide plate 5 to swing by using the support 4 as a reaction force member, thereby providing tension. The wheel 8 is urged to the side that swings down around the axis Y with respect to the support 4, and the chain changing wheel 7 is moved toward the side that ascends and swings around the axis Y with respect to the support 4. The chain C is biased to apply tension 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 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 replace the chain C with one of a plurality of chain sprockets S. The chain C is tensioned by a biasing force applied by the tension spring 12 to a tension suitable for driving the chain sprocket S.

As shown in FIG. 2 and FIG. 3, the end of the rocking link body 3, which is located on the inside of the vehicle body, of the rocking link body 2, 3 on which the rocking axis P3 is located. The swing arm 3 is provided with an inner connecting part 13a by continuously connecting the operating arm 13 having the inner connecting part 13a to the swinging link 3 by integral molding. The inner wire 9 a of the operation wire 9 is configured to be tightened and connected by a set screw 14. Therefore, the inner wire 9a is connected to the swing link body 3 via the operation arm 13. An outer receiving portion 15 as shown in FIG. 5 is provided on the mounting bracket body 1 on the rear side of the body frame F with respect to the axis X as shown in FIG.
5 is provided with an outer holder 16, wherein the outer wire 9 b of the speed change operation wire 9 is connected through the outer holder 16, and the inner wire at the end of the outer wire is turned by rotating the outer holder 16. The position of the wire connecting portion 13a can be adjusted. When the derailleur is mounted on the vehicle body, the inner connecting portion 13a is connected to the outer receiving portion 1a.
5 so that the operation arm 13 is located on the rear side of the vehicle body.
Is configured to protrude rearward from the rocking axis P3 to the vehicle body, and as shown in FIG. 1, a shift operation wire 9 from a shift operation device is directly introduced into the derailleur from a front side of the derailleur, and 9 is connected to the outer receiving portion 15 and supported by the mounting bracket body 1, and the end of the inner wire 9a is connected to the inner connecting portion 13a.
, The transmission operation wire 9 is interlocked with the quadruple link mechanism R. 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 3 is urged toward the outside of the vehicle body with respect to the mounting bracket 1 so as to apply an automatic return force to the chain changing wheel 7, and the slack operation of the speed change 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. That is, the speed change operation wire 9
When the pulling operation is performed, the inner wire 9a operates so that the swinging link body 3 swings inward of the vehicle body with respect to the mounting bracket body 1, and the chain change wheel 7 and the tension wheel 8 move inward of the vehicle body. 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 inner wire 9a operates to return the return spring 17 to swing the swing link body 3 to the outside of the vehicle body with respect to the mounting bracket body 1 to change the chain. The wheel 7 and the tension wheel 8 move to the outside 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 smaller diameter side outside the vehicle body.

In the mounting bracket 1, FIG.
As shown in FIG. 5, the inclination angle A of the pivot axis P1 with respect to the vertical line C and the inclination angle B of the axis P5 of the outer receiving portion 15 with respect to the pivot axis P1 when viewed in the vehicle front-rear direction are represented by: When the inclination angle A is set to 20 ° to 60 ° and the inclination angle B is set to 50 ° to 90 °, the outer holder 16 is moved upward from the outer receiving portion 15 to the upper side of the vehicle body with the mounting bracket body 1 attached to the vehicle body frame F. The outer receiving portion 15 is configured to extend in both forward directions.
Is a state in which the mounting bracket body 1 is connected to the rear wheel fork end portion E such 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 receiving portion 15 and toward the vehicle front. It is configured to support the outer wire 9b so as to extend toward the outer wire 9b. That is, by the action of the mounting direction of the outer wire 9b in the outer receiving portion 15, the shift operation wire 9 is introduced into the derailleur along the chain stay portion of the vehicle body frame F from the front side of the vehicle body F as shown in FIG. In addition to the wire arrangement, as shown in FIG. 6, a wire arrangement in an up-pull state in which the speed change operation wire 9 is introduced into the derailleur along the back fork portion of the vehicle body frame F can be adopted as necessary. In addition, regardless of whether the wire arrangement in the forward pulling state or the upward pulling state is adopted, the degree of bending of the speed change operation wire 9 causes a remarkable increase in operation resistance due to the bending of the operation wire due to the mounting direction of the outer connection 15. Care has been taken to avoid them.

FIGS. 7 and 8 show a rear derailleur according to another embodiment.
The inner connecting portion 13a has the swing link body 2 in plan view.
The operation arm 13 is formed so as to be located at or near the position just behind the pivot axis P1 of the swing shaft P1, and the inner connecting portion 13a is pivoted so as to be located at or near the position directly behind the outer receiving portion 15. The link body 3 is provided. In other words, the speed change operation wire 9 is connected to the swing link body 2 along the vehicle longitudinal direction in a state of being as straight as possible in the vehicle longitudinal direction, and consideration is given to transmitting the operation force in a state of extremely high transmission efficiency.

As in the above-described embodiment, the swing link bodies 2 and 3 are so arranged that the chain engaging wheel 7 and the tension wheel 8 move in the radial direction in addition to the rotation axis of the chain sprocket S during the speed change 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 exposed from the outer wire 9b and reaching the inner connecting portion 13a is hardly bent with respect to the outer wire 9b. With this configuration, the speed change operation wire 9 extends forward from the outer receiving portion 15 while facing upward. As a result, it is possible to suppress the speed change wire 9 from protruding laterally outside the vehicle body, which is advantageous. At the time of operation, the mounting links of the swing links 2 and 3 are moved so that the chain change wheel 7 and the tension wheel 8 move only in the rotation axis direction of the chain sprocket S. Pivot axis P1 relative to socket body 1,
P2 may be formed on a vertical shaft core.

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.
Therefore, these are collectively referred to as the connecting portion 10.

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 receiving portion 15 are provided on the swinging link bodies 2 and 3 or the mounting bracket body 1, as shown in the above-described embodiments, the swinging link body, the mounting bracket body and the support body are respectively provided. May be attached to a member that is connected to the swing link body or the mounting bracket body so as to operate integrally therewith, and these mounting points may be attached to the mounting bracket body 1. Alternatively, they are collectively referred to as swing link bodies.

The mounting bracket body 1 is constructed so as to be non-rotatably mounted on the fork end portion E of the vehicle body frame F as in the above-described embodiment. The fork end portion E of F is in a non-movable connection state. However, when the tension application by the chain C is released, such as when attaching or detaching the rear wheel, the rear side of the vehicle is used so that the wheels can be easily attached and detached. It may be configured and implemented so as to be in a connected state where it swings and moves. In short, it suffices that at least when the derailleur is used, it does not move with respect to the vehicle body frame F.

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 cross-sectional plan view of a rear derailleur operation 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 arrangement of the speed change operation wire.

FIG. 7 is a side view of the entire rear derailleur according to another embodiment.

FIG. 8 is a cross-sectional 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 8 Tension wheel 9 Speed change operation wire 9a Inner wire 9b Outer wire 10 Connection part 12 Tension spring 13a Inner connection part 15 Outer receiving part C Chain E Rear wheel mounting fork end F Body R Quadruple link mechanism S Chain sprocket

Claims (5)

(57) [Claims] (1 ) It can be fixed and attached to the bicycle body (F).
Noh's mounting bracket (1), a support (4) for supporting the chain transfer wheel (7) and the tension wheel (8) , and connecting the support (4) and the mounting bracket (1). And a swing link body, and a quadruple link mechanism comprising the mounting bracket body (1), the support body (4), and the swing link body.
By swinging (R) , the chain changing wheel (7) can move along the rotation axis (Z) of the chain sprocket (S) with respect to the mounting bracket body (1).
The tension is applied to the chain (C) via the tension wheel (8) by oscillatingly urging the tension wheel (8) against the support (4). A rear derailleur for a bicycle, comprising a spring (12), wherein an outer receiving portion (15) that contacts an end of an outer wire (9b) of a speed change operation wire (9) is attached to the mounting bracket body (1). The mounting bracket body (1) is attached to the vehicle body (F).
The chain (C) is attached to the chain sprocket.
(S), the chain change wheel (7), and the ten
The bicycle rear delay hung on the suspension wheel (8)
When the support is in use, the support (4) is connected to the mounting bracket (1).
The support (4) so that it is located on the front side of the vehicle body
And, projecting on the vehicle body rear side of the outer receptacle (15)
Operating arm (13) provided on the swing link body, and an inner wire (9a) of the speed change operating wire (9).
The swing link body via the operation arm (13).
Rear delay for bicycles, characterized by being connected to
La. 2. The mounting bracket of the swing link body.
The pivot axes (P1) and (P3) with respect to the
The bicycle rear derailleur is in the above-mentioned use condition At that time,
The further to the upper side of the vehicle body (F), the more inside the vehicle body
2. The bicycle rear delay according to claim 1, wherein the rear delay is inclined.
Troller. 3. The bicycle rear derailleur according to claim 3, wherein
In this state, the speed change operation wire (9) is connected to the outer
-From the receiving part (15) to the front of the vehicle body (F), and
The outer wire (9b) so as to extend upward
The supporting portion (16) for supporting the outer receiving portion (15)
The bicycle rear delay according to claim 1, wherein the rear delay is provided for a bicycle.
La. 4. The rotation of the inner wire (9a)
When the vehicle rear derailleur is in the use state,
From the outer receiving portion (15) of the working arm (13)
The inner connection provided in the area protruding to the rear of the vehicle
2. The bicycle according to claim 1, wherein the bicycle is connected to the part (13a).
Rear derailleur. 5. The mounting bracket (1) is provided with the mounting bracket (1).
Attach the mounting bracket (1) to the vehicle body (F)
And a bracket connecting portion (10) for attaching.
When the rear derailleur for turning is in the use state,
The outer receiving portion (15) is connected to the bracket connecting portion (1).
0) at a position behind the vehicle body (F).
2. The mounting bracket according to claim 1, wherein the mounting bracket is provided on the mounting bracket.
Rear derailleur for bicycles.