JPH0126556Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle speed change operating device, and more particularly to a speed change operating device that includes a front lever for operating a front derailleur and a rear lever for operating a rear derailleur.

Generally, in a bicycle, as shown in Fig. 9, a front chain gear _G1 provided on the crank and a rear chain gear _G2 provided on the rear wheel side are multi-stage, and a front derailleur _D1 and a rear derailleur _D2 are controlled by a speed change operation device. The chain C is operated and guided by the chain guides d ₁ and d ₂ of these derailleurs.
When shifting the chain in the axial direction of each of the chain gears and changing the chain to one of the multi-stage front chain gear and multi-stage rear chain gear, as shown in FIG. Because of the large inclination between the gear _G1 and the rear chain gear _G2 , the chain C came into contact with the chain guide _d1 of the front derailleur _D1 , causing noise.

Therefore, the applicant provided operating shafts for the front lever that operates the front derailleur and the rear lever that operates the rear derailleur, arranged these operating shafts in series on the same axis, and arranged the operating shafts between the respective operating shafts. A rotation transmission mechanism is provided to transmit the rotation of the rear lever to the front lever at a predetermined reduction ratio to rotate the front lever, and when the rear lever is operated, the front lever is rotated at the reduction ratio. The company first filed an application for a gear shift operating device that corrects the chain line.

However, this prior invention has a structure in which the operating shafts provided on the front lever and the rear lever are arranged in series on the same axis, so when the rotation transmission mechanism is provided between the respective operating shafts, the operating shafts are It was necessary to arrange the rotational transmission mechanism between the shaft end surfaces of these operating shafts so as to be separated from each other in the axial direction. Therefore, the length between the axially outer end surfaces of the front lever and the rear lever at the position where they are supported by the fixing member becomes longer, resulting in a problem in which the amount of protrusion of each of these levers from the bicycle frame increases. However, as the amount of each lever protrudes from the bicycle frame increases, it becomes a nuisance for the rider, making it easy for hands, feet, or clothing to get caught on the lever, which increases the risk.

In addition, in the case of the invention of the prior application, in addition to providing a part of the rotational transmission mechanism on each of the operating shafts, it is necessary to provide a third operating body that operates relative to each of the operating shafts. The structure of the mechanism was complex, which not only resulted in high costs, but also caused financial damage as the entire system became larger and heavier.

The present invention was devised in view of the above points, and the purpose is to shorten the length between the axially outer end surfaces at the support position of the front lever and rear lever while correcting the chain line, and further reduce costs. The object of the present invention is to provide a speed change operation device that can be made small and lightweight.

Therefore, the present invention is a transmission operating device equipped with a front lever for operating a front derailleur and a rear lever for operating a rear derailleur. The invention is characterized in that a rotation transmission mechanism is provided between each of the operating shafts to transmit the rotation of the rear lever to the front lever at a predetermined reduction ratio to rotate the front lever.

Embodiments of the gear shift operating device of the present invention will be described below with reference to the drawings.

The speed change operating device shown in FIGS. 1 to 4 has a boss portion 1a of the front lever ₁ that operates the front derailleur D1, and a boss portion 2a of the rear lever ₂ that operates the rear derailleur D2. 1 and a second operating shaft 3, 4 are provided, and each of these operating shafts 3, 4
are eccentric in the radial direction and are freely rotatably supported by fixing members 5 fixed to, for example, the top tube of the bicycle frame F, and are attached to the shaft end surface of the second actuating shaft 4 from the center side outward in the radial direction. A cam groove 41 extending in the circumferential direction is provided, and an eccentric protrusion 31 that is offset with respect to the axis thereof is protruded from the first operating shaft 3, and the eccentric protrusion 31 is engaged with the cam groove 41. , the rotation of the rear lever 2 is controlled from the second operating shaft 4 to the cam groove 41 and the eccentric protrusion 31.
is transmitted to the first actuating shaft 3 via the rear lever 2.
The engagement position of the cam groove 41 with the eccentric protrusion 31 is changed by the rotational force of the cam groove 41, and the first actuating shaft 3 provided with the eccentric protrusion 31, and thus the front lever 1, rotates the rear lever 2 at a predetermined reduction ratio. This was done by rotating it in the opposite direction.

In the above configuration, the fixing member 5 is formed into a plate shape with a cylindrical shaft 51 on one side, a stepped through hole 52 is provided in the plate portion, and the first actuating shaft 3 is inserted into the through hole 52. The second actuating shaft 4 is rotatably supported on the outer circumferential surface of the cylindrical shaft 51. The fixing member 5 is fixed to the frame F using fixing means such as a tightening band 6.

Further, the front lever 1 has a boss portion 1a thereof.
A shaft hole 11 is provided at the center, and the first operating shaft 3 is fitted into this shaft hole 11 so as to be freely rotatable.
Then, a disk-shaped upper lid 8 having a through hole is arranged on the outside of the boss portion 1a through a washer 7, and a tightening screw 9 that is inserted into the upper lid 8 through the washer is attached to the center of the first operating shaft 3. By screwing into a screw hole provided in the front lever 2, a predetermined rotational resistance is imparted to the front lever 2. This rotation resistance is made smaller than the resistance when the rotation of the front lever 1 is transmitted to the rear lever 2 via the rotation transmission mechanism constituted by the cam groove 41 and the eccentric protrusion 31, and when the front lever 1 rotates, This is accomplished by overcoming the rotational resistance without transmitting the rotational force to the rear lever 2, so that only the front lever 1 is rotated.

The first operating shaft 3 is formed into a cylindrical shape with a circular outward flange 3a at one end in the axial direction, and the eccentric protrusion 31 is provided on the flange 3a. The flange 3a side end portion is supported in the through hole 52 of the fixing member 5.
Incidentally, the protruding position of the eccentric protrusion 31 is not particularly limited, and may be any position as long as it is offset from the axis of the first actuating shaft 3.

The rear lever 2 is provided with a shaft hole 21 at the center of its boss portion 2a, and supports the second actuating shaft 4 in the shaft hole 21 so as not to rotate relative to each other. They fit freely. and the second operating shaft 4 and the sleeve 1
0 is rotatably supported on the cylinder shaft 51, and
A disk-shaped top cover 8 having a through hole is placed on the outside of the boss portion 2a through a washer 7, as in the case of the front lever, and a tightening screw 9 is inserted into the top cover 8 through the washer. By screwing into a screw hole provided at the center of the cylindrical shaft 51, the rear lever 2 is prevented from falling off.

The second operating shaft 4 is formed into a cylindrical shape with a circular outward flange 4a at one end in the axial direction, and the cam groove 41 is provided on the end surface on the side of the flange 4a. Note that the outer peripheral surface of the second operating shaft 4 and the shaft hole 2
A projection is provided on one side of the rear lever 2 of the second operating shaft 4, and a recessed portion is provided on the other side to engage with the projection.
It prevents rotation against the

Further, the rotation transmission mechanism that decelerates the rotation of the rear lever 2 and transmits it to the front lever 1 is connected to the cam groove 41.
and an eccentric protrusion 31, for example, the rear lever 2
is rotated 180 degrees about its rotation center O ₂ as a fulcrum, the front lever 1 is rotated in the opposite direction to the rotation direction of the rear lever 2 using its rotation center O ₁ as a fulcrum.
It rotates 24.5 degrees. The rotation of the front lever 1 is transmitted from the rotation transmission mechanism to the first operating shaft 3.
The front lever 1 is rotated through the rotational resistance applied to the front lever 1, but instead of the rotational resistance applied to the front lever 1, a one-way rotation transmission mechanism is used to transmit the one-way rotation. The front lever 1 may be rotated via a mechanism. In this case, since it is not necessary to provide the front lever 1 with rotational resistance that overcomes the return spring of the front derailleur, the front lever 1 can be operated easily.

The first actuating shaft 3 and the second actuating shaft 4 may be provided so as to protrude from the fixing member 5 in opposite directions as shown, or may be provided so as to protrude in the same direction.

The present invention is constructed as described above, and as is known, the front lever 1 and the rear lever 2 are connected to the chains of the front derailleur D ₁ and the rear derailleur D ₂ via the first and second operating wires W ₁ and W ₂ . The front lever ₁ and the rear lever 2 are connected to movable members having guides d 1 and d ₂ , respectively, and are connected to return springs (not shown) in the derailleurs D ₁ and D ₂ .
The chain guides d ₁ , d ₂ are moved forward in the pulling direction of the operating wires W ₁ , W ₂ against the
by moving the front lever 1 and the rear lever 2 backward in the direction of loosening the operating wires W ₁ and W ₂ , the chain guides d ₁ and d ₂ are moved in the direction of the return spring. It uses force to move the gear backwards to shift to a predetermined gear position.

When the rear lever 2 is rotated, for example, in the forward direction (arrow x direction in FIGS. 2 and 4), the rotation transmits the rotational transmission mechanism consisting of the cam groove 41 and the eccentric protrusion 31 from the second operating shaft 4. The signal is then transmitted to the first actuating shaft 3, causing the front lever 1 to rotate, and the rear lever 2 and, in turn, the second actuating shaft 4 to rotate the front lever 1.
When the outer cam surface 41a of the cam groove 41 is rotated by 180 degrees, the engaging position of the outer cam surface 41a with the eccentric protrusion 31 changes, as shown by the solid line in FIG.
is displaced toward the rotation center O ₂ of the second actuation shaft 4 in a direction opposite to the rotation direction of the second actuation shaft 4, and with this displacement, the first actuation shaft 3 and, by extension, the front lever 1 The speed is reduced and the rear lever 2 rotates 24.5 degrees in the opposite direction of rotation. As the front lever 1 rotates, the first operating wire W ₁ connected to the front lever 1 is loosened, and the chain guide d ₁ of the front derailleur D ₁ is moved in the backward direction (first direction) by the force of the return spring. It is slightly displaced in the direction of arrow A in Fig. 10).
Therefore, even if the angle of inclination of the chain line of the chain C increases by operating the rear lever 2, it is possible to prevent the chain C from coming into contact with the chain guide _d1 .

Furthermore, when the rear lever 2 is rotated, for example, 180 degrees in the backward movement direction (direction of arrow Y in FIGS. 2 and 4), the inner cam surface 41b of the cam groove 41 engages with the eccentric protrusion 31, as shown by the chain line in FIG. The engagement position has changed,
The eccentric protrusion 31 is located at the rotation center O ₂ of the second operating shaft 4.
The second actuating shaft 4 is displaced in a direction opposite to the rotating direction of the second actuating shaft 4, and as a result of this displacement, the first actuating shaft 3 and, by extension, the front lever 1 are decelerated, and the rear lever 2 is rotated in the rotating direction. in the opposite direction
It rotates 24.5 degrees. As the front lever 1 rotates, the first operating wire W ₁ connected to the front lever 1 is pulled, and the chain guide d ₁ of the front derailleur D ₁ is moved forward against the force of the return spring. It is slightly displaced in the direction of movement (direction of arrow B in FIG. 10). Therefore, even if the angle of inclination of the chain line of the chain C becomes large by operating the rear lever 2, it is possible to prevent the chain C from coming into contact with the chain guide _d1 .

Further, when the front lever 1 is rotated in the forward or backward direction, only the front lever 1 rotates by overcoming the rotational resistance of the front lever 1, and the rotation transmission mechanism does not operate. It is.

In the embodiment described above, a mechanism consisting of a cam groove 41 and an eccentric protrusion 31 was used as the rotational transmission mechanism, but other examples shown in FIGS. 4 to 7 or 8
It may be configured as shown in the figure.

5 to 7, a guide groove 32 extending in the radial direction is provided on the shaft end surface of the first operating shaft 3, and a guide groove 32 extending in the radial direction is provided on the shaft end of the second operating shaft 4. An eccentric protrusion 42 that is offset from the guide groove 32 is provided to protrude, and the eccentric protrusion 42 is engaged with the guide groove 32 to control the rotation of the rear lever 2 from the second operating shaft 4 to the eccentric protrusion 42 and the guide groove 32. is transmitted to the first actuating shaft 3 via the rotational force of the rear lever 2 to change the engagement position of the eccentric protrusion 42 with the guide groove 32.
The actuation shaft 3, and thus the front lever 1, are made to rotate in a direction opposite to the rotation direction of the rear lever 2 at a predetermined reduction ratio. In the drawing, when the rear lever 2 is rotated 100 degrees, the front lever 1 is rotated approximately 19 degrees. In this case as well, when the front lever 1 is rotated, only the front lever 1 overcomes the rotation resistance of the front lever 1 and rotates, and the rotation transmission mechanism does not operate.

The guide groove 32 has a length necessary for the eccentric protrusion 42 that engages with the guide groove 32 to rotate around the rotation center O ₂ of the second operating shaft 4 while changing its engagement position. All you have to do is form it. Further, the protruding position of the eccentric protrusion 42 is not particularly limited, and may be any position that is offset from the axis of the second operating shaft 4.

In addition, the fixing member 5 in FIGS. 5 to 7 is
a first housing 5a having a stepped through hole 52 for supporting the first operating shaft 3; and a second housing 5b having a stepped through hole 53 for supporting the second operating shaft 4.
and both housings 5a and 5b.
are connected by a set screw 20.

Moreover, what is shown in FIG. 8 is the first operating shaft 3.
A large diameter gear 33 with a large number of teeth is provided on the outer periphery of the shaft end,
Further, a small diameter gear 43 with a small number of teeth is provided on the outer periphery of the shaft end of the second actuation shaft 4, and the large diameter gear 33 and the small diameter gear 43 are meshed with each other, so that the rotation of the rear lever 2 is controlled by the second actuation shaft 4. The transmission is transmitted from the shaft 4 to the first actuation shaft 3 via the small diameter gear 43 and the large diameter gear 33, and the rotational force of the rear lever 2 changes the meshing position of the small diameter gear 43 with the large diameter gear 33, thereby causing the first operation. The shaft 3, and thus the front lever 1, are made to rotate in the opposite direction to the rotation direction of the rear lever 2 at a predetermined reduction ratio. In this case, the torque required to transmit the rotation of the rear lever 2 from the second operating shaft 4 to the first operating shaft 3 via the small diameter gear 43 and the large diameter gear 33 is transferred to the front lever 1.
When the front lever 1 is rotated with a torque larger than that required to transmit the rotation from the first operating shaft 3 to the second operating shaft 4 via the large-diameter gear 33 and the small-diameter gear 43, the front lever Only the front lever 1 is rotated by overcoming the rotational resistance of the lever 1.

Furthermore, the fixing member 5 in FIG.
It is formed of a hollow housing having two through holes that support the second actuating shafts 3 and 4.

In the case of FIG. 8, at least one intermediate gear may be freely rotatably provided between the large diameter gear 33 and the small diameter gear 43.

As described above, according to the present invention, the rotation of the rear lever is transmitted to the front lever at a predetermined reduction ratio via the rotational transmission mechanism, and the front lever is rotated in the opposite direction to the rotation direction of the rear lever. In addition, since the operating shafts provided on the front lever and the rear lever are eccentric and the rotation transmission mechanism is provided between these operating shafts, the outer peripheries of the shaft ends of the respective operating shafts are overlapped, and this overlap is prevented. The rotational transmission mechanism can be provided in the part, and therefore, the length between the axially outer end surfaces at the support position of the front lever and the rear lever (Fig. The amount of protrusion from the bicycle frame can be reduced, and there is less risk of the driver getting his hands, feet, or clothes caught, improving safety.

Moreover, as the rotational transmission mechanism, a mechanism with an extremely simple structure consisting of, for example, a groove provided on each of the operating shafts and an eccentric protrusion that engages with the groove can be used, so that it is possible to significantly reduce costs. At the same time, the whole can be made smaller and lighter.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the device of the present invention. Figure 1 is a cross-sectional plan view, Figure 2 is a front view, Figure 3 is an exploded perspective view of the main parts, and Figure 4 is a cross-sectional plan view. It is an operation explanatory diagram. 5 to 7 show another embodiment of the device of the present invention, in which FIG. 5 is a partially omitted cross-sectional plan view, FIG. 6 is a reduced exploded perspective view with the lever omitted, and FIG. The figure is an explanatory diagram of the operation. FIG. 8 is a cross-sectional plan view showing still another embodiment of the device of the present invention, and FIGS. 9 and 10 are explanatory diagrams showing the relationship among the chain gear, derailleur, and chain. 1...Front lever, 2...Rear lever,
3, 4... Operating shaft, 31, 42... Eccentric protrusion, 3
2... Guide groove, 33, 34... Gear, 41...
Cam groove, D ₁ ... Front derailleur, D ₂ ...
Rear dayrailer.

Claims (1)

[Scope of utility model registration request] A transmission operating device comprising a front lever for operating a front derailleur and a rear lever for operating a rear derailleur, wherein each of the levers is provided with an operating shaft, and each of the operating shafts is made eccentric. A bicycle speed change operating device, characterized in that a rotational transmission mechanism is provided between operating shafts to transmit the rotation of the rear lever to the front lever at a predetermined reduction ratio to rotate the front lever.