JPH0349796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle derailleur, and more particularly, a link mechanism comprising a base member, a pair of link members, and a movable member having a chain guide. The present invention relates to a derailleur in which the link mechanism is deformed by relative movement with the base member, the movable member is moved relative to the base member, and the chain guided by the chain guide is replaced with one of the multi-stage sprockets of the bicycle to change speed. .

Generally, this type of derailleur transmits the operating force of the operating lever to the link mechanism via the operating wire, deforms the link mechanism, and moves the chain guide in the axial direction of the multi-stage sprocket. The gear shift position is maintained.

Conventionally, as means for holding the gear shift position of the chain guide, for example, the derailleur or the gear shift operating device having the operation lever includes a plurality of engaging parts and an engaged part that selectively engages with one of the engaging parts. By providing a position setting mechanism consisting of a joint part, the gear shift position of the chain guide is maintained.

However, when the position setting mechanism consisting of the engaging part and the engaged part is used as described above, the chain guide is moved quantitatively because the amount of movement for a certain stroke of the operating wire is set. Therefore, when used with a multistage sprocket in which the spacing (L) between the center lines in the width direction of each sprocket is commensurate with the quantitative movement of the chain guide,
During gear shifting, the chain guide can be stopped at a position corresponding to the center line in the width direction of each sprocket, and there is no problem. However, the spacing (L) between the center lines in the width direction of each sprocket is The spacing is not commensurate with the quantitative amount of movement of the guide,
If the interval is (L+△L) or (L-△L),
During gear shifting, the chain guide, which moves quantitatively with respect to a constant stroke of the operating wire, cannot be stopped at an appropriate position corresponding to the center line in the width direction of each sprocket. Therefore, in the past, many types of derailleurs were prepared with different amounts of movement of the chain guide for a constant stroke of the operating wire, or the speed changeability was poor and noise was easily generated due to contact between the chain and sprocket. I needed to use it.

The present invention was devised in view of the above-mentioned conventional problems, and an object of the present invention is to support the operating wire or the outer cylinder that guides the wire while being able to quantitatively move the chain guide during gear shifting. By changing the position of the tool, it is possible to change the quantitative amount of movement of the chain guide tool with respect to a constant stroke of the wire.

Therefore, the configuration of the present invention includes a link mechanism including a movable member having a base member, a pair of link members, and a chain guide, and the link mechanism is moved by relative movement with an operating wire and an outer cylinder that guides the wire. The bicycle derailleur is deformed so that the movable member is moved relative to the base member, wherein at least one of the supports that support the wire and the outer tube is connected to one of the link mechanisms through an attachment position changing mechanism. attached to a member, and by changing the position of the support, the amount of movement of the movable member relative to the base member with respect to a constant stroke of the wire can be changed, so that the quantitative amount of movement of the chain guide can be changed. That's what I did.

What is shown in the drawing is a rear derailleur, and its basic structure is as shown in Figures 1 and 2.
The four-link mechanism A pivots on the fixed member 1, that is, the four-link mechanism A consists of four members: two link members 3 and 4 parallel to the base member 2, and the movable member 5, and the above-mentioned Fixed member 1
is fixed to the fork end of the bicycle, and the base member 2 of the link mechanism A is
It is supported by the fixed member 1 via the horizontal shaft 6 so as to be freely swingable.

Further, the base member 2 is provided with a pair of mounting pieces facing each other on one side, and the link members 3 and 4 are pivotally connected to these mounting pieces via a pair of pins 7 and 8. At the free ends of the link members 3 and 4, via a pair of pins 9 and 10,
The movable member 5 is pivotally mounted.

This movable member 5 has a similar shape to the base member 2, and has mounting pieces facing each other on one side thereof, and the two pins 9, 10 are attached to the mounting piece to connect the link members 3, 10. A guide pulley (not shown) is mounted on the other side via a horizontal shaft 11 extending in the same direction as the horizontal shaft 6.
A chain guide 13 having a tension pulley 12 is mounted so as to be rotatable within a certain range, and the swinging of the link members 3 and 4 causes the movable member 5 to move relative to the base member 2 as shown in FIG. It moves in parallel between a high speed position and a low speed position.

Also, a chain guide 1 attached to the movable member 5
3 consists of the guide pulley and tension pulley 12, and a hanging frame 14 that rotatably supports these pulleys. It supports the

Further, in the derailleur configured as described above, a return spring (not shown) is provided between either one of the link members 3 and 4 and the movable member 5 or the base member 2, so that the movable member 5
, in the axial direction of the multi-stage sprocket, that is, the top side or the low side, usually the top side.
Further, an operating wire W is connected to one member (link member 3 in the drawing) of the link mechanism A consisting of four members, the base member 2, the link members 3, 4, and the movable member 5.
A first support 20 for supporting the wire W is provided, and a second support 30 for supporting the outer tube O for guiding the wire W is provided on another member (base member 2 in the drawing). By pulling the wire W, the link member 3 is swung against the return spring, and the movable member 5 is moved forward, and when the wire W is being relaxed, the link is moved by the restoring force of the return spring. The members 3 and 4 are oscillated to cause the movable member 5 to move backward, and the backward movement of the movable member 5 moves the chain suspended from the guide pulley and tension pulley of the chain guide 13 to the multi-stage sprocket. Replace it with one of the sprockets.

In the embodiment shown in FIG. 1, in the derailleur configured as described above, the first support 20 supporting the operating wire W is connected to the elongated guide portion 41 and the protrusion protruding into the guide portion 41. The first support 20 is attached to the link member 3 so that its attachment position can be changed through an attachment position changing mechanism 40 that includes a portion 42 and an adjustment screw 43, and the position of the first support 20 relative to the link member 3 is adjusted by operating the adjustment screw 43. The change is made to change the amount of movement of the movable member 5 and, in turn, the chain guide 13 relative to the base member 2 with respect to a constant stroof of the wire W.

In the above configuration, the first support 20 includes:
A support body 21 having a holding portion 21a having a U-shaped cross section and a mounting hole 21b, and the mounting hole 2 of the support body 21.
As shown in FIG. 2, the holding part 21a of the support body 21, which is formed by a screw body 22 and a clamping plate 23 screwed into the link member 3, is moved in the length direction of the link member 3. It is possible to install it.
Further, the clamping plate 23 is provided with a groove 23a,
One end of the wire W is fitted between the groove 23a and the support body 21, and the wire W is clamped and fixed by tightening the screw body 22.
Further, the support body 22 is provided with a contact portion 21c that comes into contact with the adjustment screw 43.

Further, the guide portion 4 of the mounting position changing mechanism 40
1 is provided on the link member 3 along the length direction of the link member 3, and the projection 4 is provided on the link member 3 along the length direction of the link member 3.
2 uses a head screw and attaches this screw to the support body 21.
The supporting member 20 is screwed onto the holding portion 21a of the support member 20, and its tip portion is inserted into the guide portion 41, so that the support 20 is moved relative to the link member 3 within the length of the guide portion 41. In addition, the adjustment screw 43 is operated by providing an upright piece 3a on the link member 3, screwing the upright piece 3a onto the upright piece 3a, and bringing the tip of the upright piece 3a into contact with the abutment part 21c. According to
The first support 20 is moved along the length direction of the link member 3, and the support position (P ₁ ) of the first support 20 to the link member 3 and the link member 3 are determined.
For example, the length between the supporting position (P ₂ ) to the base member 2 is from (H) to (H-△H) or (H+△+
This is done by changing it to H). Incidentally, the adjustment screw 43 is supported, for example, only by rotation, and its tip is screwed into the abutting part 21c of the support body 21, so that the support body 21 is moved by rotation of the adjustment screw 43. Good too.

In addition, 15 in the figure is a tension spring of the chain guide tool 13.

Further, as the operating wire W, a push-pull type wire with a small amount of deflection is mainly used, but it goes without saying that other general wires with a relatively large amount of deflection may be used.

Next, the operation of the derailleur constructed as above will be explained.

The device shown in FIG. 1 is mainly used with a speed change operating device equipped with a position setting mechanism consisting of a plurality of engaging parts and an engaged part that selectively engages one of the engaging parts. In FIG. 1, the chain guide 13 is located at a position corresponding to the center line in the width direction of the small diameter sprocket in the multi-stage sprocket. When the operating wire W is pulled from this state, the distance between the support position of the wire W supported by the first support 20 and the support position of the outer tube O supported by the second support 30 becomes shorter. Link mechanism A
The movable side member operates, the link mechanism A deforms, and the chain guide 13 provided on the movable member 5 moves in the direction of the large diameter sprocket of the multistage sprocket.
As shown in FIG. 4, the chain guide 13 moves by a quantitative movement amount set by the position setting mechanism of the speed change operating device, and stops at a position corresponding to the desired center line in the width direction of the large diameter side sprocket. do.

Furthermore, when the wire W is loosened from the state where the chain guide tool 13 has been moved toward the large diameter sprocket as described above, the movable side member of the link mechanism A is operated by the restoring force of the return spring, and the chain guide tool 1
3 moves in the direction of the small diameter sprocket of the multi-stage sprocket every quantitative movement amount set by the position setting mechanism, and stops at a position corresponding to the desired width direction center line of the small diameter side sprocket.

Next, when the amount of movement of the chain guide 13 that moves the derailleur in response to the constant stroke of the operating wire set by the position setting mechanism is △l greater than the distance L between the center lines in the width direction of each sprocket in the multi-stage sprocket. The link member 3 of the first support 20 is rotated by rotating the adjusting screw 43 in the retracting direction.
changing the attachment position of the wire W from the (P ₁ ) position shown in FIG. 1 to the (P ₂ ) position (the state shown in FIG. 3), and changing the supporting position of the wire W with respect to the link member 3;
The attachment position of the first support 20 to the link member 3 and the support position P ₂ of the link member 3 to the base member 2
△H is shortened to a length of (H - △H), so that the swing angle of the link member 3 with respect to a constant stroke of the wire W becomes a swing angle from θ to (θ + △θ). , the amount of movement of the movable member 5, and therefore the chain guide 13, relative to the base member 2 relative to the fixed stroke of the wire W is increased by △l to make the amount of movement (l + △l), and the center line in the width direction of the sprocket is The amount of movement is set to correspond to the interval L.

If the amount of movement of the chain guide 13 with respect to the constant stroke of the operating wire W set by the position setting mechanism is less than the sprocket interval L by △l, the adjusting screw 43 is rotated in the spiral direction. The attachment position of the support 20 to the link member 3 is changed from the P1 position shown in FIG. ₁ to the _P4 position, which is provided on the opposite side to the _P3 position, and the supporting position of the wire W with respect to the link member 3 is changed. Then, the length between the attachment position of the first support 20 and the support position (P ₂ ) of the link member 2 is increased by ΔH (H+ΔH).
The length of the link member 3 with respect to a constant stroke of the wire W is from θ to (θ−△
The movement amount of the chain guide tool 13 with respect to the constant stroke of the wire W is reduced by △l to make the movement amount (l - △l), and the center line in the width direction of the sprocket is The amount of movement is set to correspond to the interval L.

In the embodiment described above, the first support 20 that supports the operation wire W is attached to the link member 3, but
In addition, the first support member 20 is supported by, for example, the base member 2, the link member 4, the movable member 5, or any one of the base member 2, the link member 3 or 4, the movable member 5, and the pins 7 to 10. It may be provided on the member. In this case, the outer cylinder O
The second support 30 supporting the first support 2
0 may be attached to a member that moves relative to the member to which it is attached.

Furthermore, in the above description, the first support 20 is movably mounted, and the adjustment screw 4 of the mounting position changing mechanism 40 is
3, the first support 20 is moved to change the mounting position, but in addition, for example, a plurality of mounting holes may be provided in the member supporting the first support 20, or the first support 20 may be moved. A long hole may be provided in the first support 20, and the first support 20 may be mounted so as to be changeable by the mounting screw of a mounting position changing mechanism having a mounting screw, and the means for changing the mounting position is not particularly limited. .

Further, the first support 20 is formed of a support body 21, a tightening screw 22, and a clamping plate 23, but only the tightening screw 22 is used, and by tightening the tightening screw 22, the wire W may be fixed to the link member 3, for example. In this case, for example, the link member 3 is provided with a plurality of attachment holes.

Furthermore, in the above description, the mounting position of the first support 20 that supports the operating wire W was changed to change the amount of movement of the chain guide 13 with respect to a constant stroke of the operating wire W. As shown in the figure, a second supporter 30 that supports the outer cylinder O
The mounting position may be changed.

In the case shown in FIG. 5, the second support 30 is formed separately from the base member 2, and the second support 30 is connected to the elongated guide portions 41, 41, the guide portions 41, The second support 30 is attached to the base member 2 so that its attachment position can be changed via an attachment position changing mechanism 40 that includes protrusions 42, 42 that protrude into 41 and an adjustment screw 43, and the second support 30 is attached to the base member 2 so that the attachment position can be changed by operating the adjustment screw 43. By changing the position with respect to the base member 2, the tension angle of the operating wire W with respect to the link mechanism A between the first support 20 and the second support 30 is changed, and the link member 3 is changed for a constant stroke of the wire W. The swing angle of the chain guide tool 1 is set to be a swing angle of (θ-△θ) or (θ+△θ), and the chain guide tool 1
The amount of movement of 3 is made to be (l-△l) or (l+△l).

In FIG. 5, the guide portion 41 is provided on the second support 30, the protrusion portion 42 is provided on one end of the pins 7, 8, and the adjustment screw 43 is provided on the base member 2. It is screwed onto the upper piece 3a, and its tip is brought into contact with a contact portion 30a provided on the second support 30, so that the second support 30 can be moved in the direction of the arrow X by operating the adjustment screw 43. However, the configuration of the attachment position changing mechanism for the second support 30 is not particularly limited.

In addition to being supported by the base member 2, the second support 30 is also supported by the link member 3 or 4 and the movable member 5.
It may be attached to any one member of the base member 2, the link member 3 or 4, and the movable member 5. It may be attached to a member supporting one or two pins among 7 to 10.
In this case, the first support 2 that supports the wire W
0 may be attached to a member that moves relative to the member to which the second support 30 is attached.

As described above, the present invention includes a link mechanism including a movable member having a base member, a pair of link members, and a chain guide, and deforms the link mechanism by relative movement with an operating wire and an outer cylinder that guides the wire. and at least one of the supports for supporting the wire and the outer tube in the bicycle derailleur in which the movable member is moved relative to the base member is also attached to one member of the link mechanism via the attachment position changing mechanism, By changing the position of the support, the attachment position changing mechanism can change the attachment position of the support that supports the operating wire and the outer tube, so that the movable member and, by extension, the chain guide, can be adjusted for a given stroke of the operation wire. If the amount of movement corresponds to the spacing L between the center lines in the width direction of each sprocket in the multi-stage sprocket, and does not correspond to the spacing of (L+△L) or (L-△L), the above-mentioned mounting By simply operating the position change mechanism to change the mounting position of the support, the amount of movement of the chain guide relative to the fixed stroke of the wire can be changed from the amount of movement corresponding to the distance L to (L+△L). )
Alternatively, the amount of movement can be changed to match the interval of (L-ΔL). As a result, there is no need to prepare multiple types of derailleurs, making it economical, with good shifting performance,
The contact between the chain and sprocket can also eliminate noise.

[Brief explanation of drawings]

FIG. 1 is a bottom view showing one embodiment of the derailleur of the present invention, FIG. 2 is a cutaway perspective view showing a support device for supporting an operating wire attached to a link member, and FIG.
The figure is an explanatory diagram when the mounting position of the support tool is changed, Figure 4 is an explanatory diagram showing the positional relationship between the multi-stage sprocket and the chain guide, and Figures 5 and 6 show another embodiment. FIG. 5 is a bottom view, and FIG. 6 is an explanatory diagram when the mounting position of the support for supporting the outer cylinder is changed. 2... Base member, 3, 4... Link member, 5
...Movable member, A...Link mechanism, 13...Chain guide, 20...First support, 30...Second support, W...Operation wire, O...Outer cylinder.

Claims (1)

[Claims] 1. A link mechanism comprising a movable member having a base member, a pair of link members, and a chain guide, and the link mechanism is deformed by relative movement with an operating wire and an outer tube that guides the wire, and the movable member is moved to the base. A bicycle derailleur that is movable relative to a member, wherein at least one of the supports for supporting the wire and the outer tube is attached to one member of the link mechanism via an attachment position changing mechanism, and the position of the support is adjusted. Due to the changes,
A bicycle derailleur characterized in that the amount of movement of the movable member relative to the base member with respect to a constant stroke of the wire is changed.