JPH0126557Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a bicycle gear shift operating device, more specifically, it is equipped with a front lever for operating a front derailleur and a rear lever for operating a rear derailleur, and an interlocking mechanism is provided between each of these levers. The present invention relates to a speed change operation device in which when the rear lever is operated, the front lever is actuated to operate the front derailleur.

In general, a bicycle has a multi-stage front chain gear _G1 provided on the crank and a rear chain gear _G2 provided on the rear wheel side, as shown in Fig. 8, and a front derailleur _D1 and a rear derailleur _D2 are controlled by a speed change operation device. The chain C guided by the chain guides d ₁ and d ₂ of these derailleurs is moved in the axial direction of each of the chain gears, and the chain is changed to one of the multi-stage front chain gear and multi-stage rear chain gear to shift the gear. When doing this, _the chain line of the chain C is inclined greatly between the front chain gear _G1 and the rear chain gear _G2 as _shown in FIG. When I made contact with it, it made a noise.

Therefore, the applicant of the present invention has created a system between the lever shaft of the front lever that operates the front derailleur and the lever shaft of the rear lever that operates the rear derailleur, so that the rotation of the rear lever is transmitted to the front lever at a predetermined reduction ratio. The patent previously filed an application for a speed change operation device which is provided with an interlocking mechanism for rotating the front lever, and when the rear lever is operated, the front lever is rotated at the reduction ratio to correct the chain line.

However, when configured as in the prior application, the front lever is given a rotational resistance that overcomes the return spring in the front derailleur, and when the front lever is operated forward, that is, in the tension direction of the return spring. When the front lever is rotated in the opposite direction and when the front lever is actuated by the rear lever, it is necessary to maintain the shift operation position by the rotational operation of the front lever and the operating position by the rear lever by the rotational resistance; It is necessary to make the rotational resistance of the front lever so large that the rotational resistance does not decrease even if the rear lever is repeatedly operated. This required operating force, and the gear shifting operation could not be carried out easily.

The purpose of the present invention is to provide a gear shift operating device that is capable of correcting the chain line by operating the front lever when operating the rear lever.Instead of providing rotational resistance to the front lever, a one-way rotation transmission mechanism is provided. Accordingly, it is possible to reliably maintain the shift operation position of the front lever and the operation position of the rear lever.

The configuration of the present invention includes a front lever for operating the front derailleur and a rear lever for operating the rear derailleur.
A speed change operation device is provided with an interlocking mechanism so that when the rear lever is operated, the front lever is actuated to operate the front derailleur, the front lever being connected to a lever body;
The front derailleur is constructed of a winding body that locks the operating wire and a lever shaft that operates in conjunction with the rear lever, and between the lever shaft and the winding body, the front derailleur is connected to the lever shaft by the rear lever. a unidirectional rotation transmission mechanism that transmits rotation in the opposite direction to the tension direction of the return spring to the winding body; While providing an interlocking part that transmits rotation in the opposite direction to the winding body,
By providing the lever body with a release body that releases the one-way rotation transmission mechanism when the lever body rotates in the tension direction of the return spring, the front lever can be prevented from impacting the return spring in the front derailleur. This allows the gear shift operation to be performed simply by applying a sufficient operating force, and the shift operation position and the operating position of the rear lever can be maintained reliably.

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 5 includes a front lever 1 for operating a front derailleur _D1 , a lever body 11, a winding body ₁₂ for stopping an operating wire W1, and a rear derailleur _D2. The rear lever 2 is composed of a lever body 21 that locks the operating wire W ₂ and a second lever shaft that supports the lever body 21. 22, and the first and second lever shafts 13, 22
are eccentrically radially supported and freely rotatably supported by fixing members 3 fixed to, for example, the top tube of the bicycle frame F, and are attached to the shaft end surface of the second lever shaft 22 from the center side toward the outside in the radial direction. A cam groove 41 extending in the circumferential direction is provided, and the first lever shaft 13 is provided with an eccentric protrusion 4 that is offset with respect to its axis.
2 is provided protrudingly, and this eccentric protrusion 42 is inserted into the cam groove 4.
1, the rotation of the rear lever 2 is controlled from the second lever shaft 22 to the cam groove 41 and the eccentric protrusion 4.
The first lever shaft 13 via an interlocking mechanism 4 consisting of
and changing the engagement position of the cam groove 41 with the eccentric protrusion 42 by the rotational force of the rear lever 2,
The first lever shaft 13 provided with the eccentric protrusion 42 and, by extension, the front lever 1 are configured to rotate in a direction opposite to the rotation direction of the rear lever 2 at a predetermined reduction ratio, while the lever body 11 of the front lever 1 and The winding body 12 is rotatably supported on the first lever shaft 13, and between the first lever shaft 13 and the winding body 12, the rotation of the first lever shaft 13 by the rear lever 2 is provided. A one-way rotation transmission mechanism 5 is provided that transmits the rotation in the opposite direction to the tension direction of the return spring of the front derailleur D ₁ to the winding body 12, and the lever body 11 and the winding body 12 are connected to each other. Interlocking parts 11a and 12a are provided to transmit the rotation of the body 11 in the direction opposite to the direction in which the return spring is pulled to the winding body 12, and the lever body 11 is further provided with interlocking parts 11a and 12a that transmit the rotation of the body 11 in the direction in which the return spring is pulled. A release body 6 is provided for releasing the one-way rotation transmission mechanism 5 during rotation.

In the above configuration, the lever body 11 of the front lever 1 is composed of a cylindrical boss portion 11c having a shaft hole 11b and an operating portion 11d extending radially outward from one side of the boss portion 11c, The shaft hole 11b portion is rotatably supported by the circular shaft portion of the first lever shaft 13, which has a circular shaft portion and a non-circular shaft portion on its outer peripheral surface, and the boss portion 11c of this lever body 11. One side is cut out to make it thinner, and the winding body 12 is disposed within the cutout part 11e, and the interlocking part 11a is provided protrudingly on the outside of the cutout part 11e.
A recessed portion 11f is provided at an outer position of 1c, and the release body 6 is supported in the recessed portion 11f.

The winding body 12 is formed into a cylindrical shape having a through hole 12b at the center, a wire guide groove 12c and the second interlocking part 12a on the outer periphery, and the through hole 12b portion is connected to the first interlocking part 12a. It is rotatably supported on the outer peripheral surface of the sleeve 7 which is non-rotatably fitted to the non-circular shaft of the lever shaft 13, and one end of the operating wire _W1 is locked to the interlocking part 12a. A lumen part 12d that opens to the inner surface of the through hole 12b is provided on one side of the through hole 12b, and the one-way rotation transmission mechanism 5 is provided inside the lumen part 12d, and a part of the release body 6 is inserted thereinto. It is.

The first lever shaft 13 is formed in a cylindrical shape with a circular outward flange 13a at one end in the axial direction, and the eccentric protrusion 4 is attached to the flange 13a.
2 is provided. and the flange 13a
a stepped through hole 3 whose side end is provided in the fixing member 3;
1. Note that 8 is a cap and 9 is a tightening screw.

The one-way rotation transmission mechanism 5 includes the inner cavity 12
d A cam surface 51 provided on the inner surface, a rolling element 52 such as a ball that contacts the cam surface 51, and a spring 5 that always biases the rolling element 52 in the direction of the cam surface 51.
3, and the rolling element 52 is connected to the cam surface 51.
and the outer circumferential surface of the sleeve 7 to transmit rotation of the first lever shaft 13 by the rear lever 2 to the winding body 12 in a direction opposite to the direction in which the return spring is pulled. Note that the cam surface 51 may be provided on the outer periphery of the sleeve 7.
Furthermore, instead of using balls as shown in FIG. 3, the rolling elements 52 may be rollers or taper pins as shown in FIG. 6. Moreover, the one-way rotation transmission mechanism 5
A plurality of these are provided as shown in Fig. 3.
One piece is enough.

Further, the release body 6 includes a support piece 61 and a release piece 62.
The support piece 61 is inserted into and supported by the recessed part 11f of the lever body 11, and is actuated following the rotation of the lever body 11. 62 is inserted into the inner cavity 12d of the winding body 12 and is opposed to the rolling element 52. Note that the release body 6 may have a structure that can be formed integrally with the lever body 11.

The rear lever 2 is inserted into the shaft hole 21b of the lever body 21, which is composed of a cylindrical boss portion 21c having a shaft hole 21b and an operating portion 21d extending radially outward from one side of the boss portion 21c. , the second lever shaft 22 is supported so as not to be relatively rotatable, and the cylindrical body 23 is fitted thereto so as to be relatively freely rotatable. The second lever shaft 22 and the cylindrical body 23 are rotatably supported by a cylindrical shaft 32 provided on the fixing member 3, and a disc-shaped upper lid 10 has a through hole provided on the outside of the boss portion 21c via a washer. A tightening screw 20, which is inserted into the upper cover 10 through a washer, is screwed into a screw hole provided at the center of the cylindrical shaft 32, thereby preventing the rear lever 2 from falling off.

The second lever shaft 22 of the rear lever 2 is formed into a cylindrical shape with a circular outward flange 22a at one end in the axial direction, and the cam groove 41 is provided on the end surface on the side of the flange 22a. In addition, the second lever shaft 2
A protrusion is provided on one of the outer peripheral surface of the shaft hole 21b and the shaft hole 21b, and a recessed portion that engages with the protrusion is provided on the other,
Rotation of the second lever shaft 22 relative to the lever body 21 is prevented.

The interlocking mechanism that decelerates the rotation of the rear lever 2 and transmits it to the front lever 1 is composed of the cam groove 41 and the eccentric protrusion 42. For example, as shown in FIG _. as a fulcrum
When the front lever 1 is rotated by 180 degrees, the front lever 1 is rotated by 24.5 degrees in the opposite direction to the rotation direction of the rear lever 2, using the rotation center _O1 as a fulcrum. This rotation of the front lever 1 causes the winding body 12 and the lever body 11 to rotate from the interlocking mechanism 4 via the first lever shaft 13 and the one-way rotation transmission mechanism 5. The interlocking mechanism 4 is configured such that the rotational force from the rear lever 2 is transferred to the winding body 1 of the front lever 1.
However, the rotational force from the lever body 11 of the front lever 1 is not transmitted to the rear lever 2.

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 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 operation 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 5), the outer cam surface 41a of the cam groove 41 engages with the eccentric protrusion 42, as shown by the solid line in FIG. As the position changes, the eccentric protrusion 42 is displaced toward the rotation center O ₂ of the second lever shaft 22 in a direction opposite to the rotation direction of the second lever shaft 22, and along with this displacement, the eccentric protrusion 42 is displaced toward the rotation center O 2 of the second lever shaft 22. The lever shaft 13 is decelerated in the direction opposite to the rotating direction of the rear lever 2 (direction of arrow Y in Figures 2, 3, and 5).
The first lever shaft 13 rotates in the direction indicated by the arrow Y in FIG.
Due to the rotation in the direction, the rotational force acts from the sleeve 7 on the rolling element 52 of the one-way rotation transmission mechanism 5,
The rolling element 52 operates against the spring 53 due to the contact resistance with the sleeve 7, and the rolling element 5
2, the rotation prevention of the winding body 12 is released, and the winding body 12 rotates in the direction of arrow Y in FIG. 3 by the force of the return spring. This rotation of the winding body 12 causes the lever body 11 to rotate in a direction opposite to the rotation direction of the rear lever 2 via the interlocking parts 12a and 11a. As the front lever 1 rotates, the first operation wire W ₁ connected to the winding body 12 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. 9). Therefore, the rear lever 2
With this operation, even if the inclination angle of the chain line of chain C becomes large, it is possible to prevent the chain C from coming into contact with the chain guide _d1 . By the way, the rear lever 2
When rotated by 180 degrees, the front lever 1
It rotates 24.5 degrees.

Also, when the rear lever 2 is rotated in the backward movement direction (arrow Y direction in FIGS. 2 and 5), the inner cam surface 41b of the cam groove 41 is rotated as shown by the chain line in FIG.
The engagement position with the eccentric projection 42 changes, and the eccentric projection 42 moves in the opposite direction to the rotation direction of the second lever shaft 22 in the direction away from the rotation center O ₂ of the second lever shaft 22. With this displacement, the first lever shaft 13 is decelerated and rotates in the direction opposite to the rotation direction of the rear lever 2 (in the direction of the arrow X in FIGS. 2, 3, and 5). Figure 3: Arrow X
When the winding body 12 rotates in the direction indicated by the arrow X in FIG. 3, the rotational force acts from the sleeve 7 on the rolling element 52 and the cam surface 51 of the one-way rotation transmission mechanism 5, and the winding body 12 rotates in the direction indicated by the arrow X in FIG. Due to this rotation of the winding body 12, the first operating wire _W1 is pulled against the force of the return spring, and the chain guide _d1 of the front derailleur _D1 is pulled against the force of the return spring. It is slightly displaced in the forward movement direction (direction of arrow B in FIG. 9). 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 . In this case, the lever body 11 follows the rotation of the winding body 12 via the release body 6.

Further, when the lever body 11 of the front lever 1 is rotated in the forward or backward direction, the transmission of the rotational force is interrupted by the one-way rotation transmission mechanism 5.
The interlocking mechanism 4 does not operate.

As shown in FIG. 3, the rolling elements 52 of the one-way rotation transmission mechanism 5 are engaged with the cam surface 51 to prevent the winding body 12 from rotating in the direction in which the return spring is pulled. When the lever body 11 is rotated in a direction opposite to the tensioning direction of the return spring (direction of arrow X in FIG. 3), the movement due to the rotation of the lever body 11 moves from the interlocking part 11a to the interlocking part 12a to the winding body 12. As a result, the winding body 12 rotates against the return spring in a direction in which the one-way rotation transmission mechanism 5 does not act, that is, in the direction of the arrow X in FIG. Then, when the rotation operation of the lever body 11 is stopped and the hand is released from the lever body 11, the rolling element 52, which is always urged by the spring 53 in the direction of meshing with the cam surface 51, engages with the cam surface 51. As a result, rotation of the winding body 12 in the direction of the arrow Y by the return spring is prevented, and the winding body 12 is reliably maintained at this position.

Further, when the lever body 11 is rotated in the tension direction of the return spring from the state shown in FIG. in contact with
The rolling element 52 operates in the direction of disengaging from the cam surface 51 against the spring 53, and the winding body 12 becomes rotatable in the tension direction of the return spring (direction of arrow Y). Then, the winding body 12 rotates in the direction of arrow Y in FIG. 3 due to the force of the return spring in the tensile direction. Next, when the rotation operation of the lever body 11 is stopped and the hand is released from the lever body 11, the rolling element 52 moves in the direction of engaging with the cam surface 51 due to the force of the spring 53, and the cam surface 51 engages with the rolling element 52. are engaged, and rotation of the winding body 12 in the direction of the arrow Y by the return spring is prevented;
It is maintained securely in this position.

In the embodiment described above, a mechanism consisting of a cam surface 51, a rolling element 52, and a spring 53 was used as the one-way rotation transmission mechanism 5, but in addition, for example, as shown in FIG. 54, and a spring 56 that always biases the transmission pawl 55 in the direction of meshing with the meshing teeth 54, and its structure is not particularly limited. In the case of FIG. 7, for example, the meshing teeth 54 are provided around the outer periphery of the sleeve 7, and the transmission pawl 55 is connected to the winding body 12.
It is supported freely up and down within the inner cavity 12d.

In the case of FIG. 7, when the first lever shaft 13 is rotated in the direction of the arrow Y due to the rotation operation of the rear lever 2, the transmission pawl 55 interferes with the top of the tooth of the meshing tooth 54, and This disengagement causes the winding body 12 to rotate in the direction of arrow Y due to the tensile force of the return spring. Further, when the first lever shaft 13 is rotated in the direction of the arrow X by the rotation operation of the rear lever 2, the rotational force is transmitted to the winding body 12 via the meshing teeth 54 and the transmission pawl 55,
The winding body 12 rotates in the direction of arrow X against the force of the return spring.

Also, as an interlocking mechanism, the cam groove 41 and the eccentric protrusion 4
Although the front lever 1 is rotated at a reduced speed by the rotation operation of the rear lever 2, the structure of the interlock mechanism is not particularly limited. In addition to the rotary interlocking mechanism, a mechanism that converts the rotation of the rear lever 2 into linear motion is used, and the front lever 1 is controlled via this mechanism.
The lever shaft may be moved in a direction perpendicular to the axis.

As described above, according to the present invention, the rotation of the rear lever can be transmitted to the front lever via the interlocking mechanism, and the front lever can be actuated to correct the chain line. , comprising a winding body that locks the operating wire and a lever shaft that operates in conjunction with the rear lever, and between the lever shaft and the winding body, the front shift of the lever shaft by the rear lever is provided. Since a one-way rotation transmission mechanism is provided that transmits rotation in the opposite direction to the tensioning direction of the return spring of the railer to the winding body, and an interlocking portion is provided between the lever body and the winding body, the front lever is The shift operation position of the front lever and the operating position of the rear lever can be reliably maintained without applying rotational resistance that overcomes the return spring. Therefore, the gear shift operation can be performed with an operating force that overcomes the return spring, and the gear shift operation can be performed easily.

Furthermore, since the rotation of the rear lever is transmitted to the winding body of the front lever via the one-way rotation transmission mechanism, the operating position of the front lever can always be reliably maintained even if the rear lever is operated repeatedly. .

[Brief explanation of the drawing]

1 to 5 show an embodiment of the device of the present invention, in which FIG. 1 is a cross-sectional plan view, FIG. 2 is a front view, FIG. 3 is an enlarged sectional view taken along the line of FIG. The figure is a perspective view of the interlocking mechanism part, and FIG. 5 is an explanatory diagram of the operation. Further, FIG. 6 is an explanatory view showing another embodiment of only a one-way rotation transmission mechanism, FIG. 7 is a partially omitted cross-sectional enlarged plan view showing another embodiment of the device of the present invention, and FIGS. 8 and 9 The figure is an explanatory diagram showing the relationship between a chain gear, a derailleur, and a chain. 1...Front lever, 11...Lever body, 1
2... Winding body, 13... Lever shaft, 2... Rear lever, 4... Interlocking mechanism, 5... One-way rotation transmission mechanism, 11a, 12a... Interlocking part, 6... Release body,
D ₁ ...Front dayrailer, _D2 ...Rear dayrailer.

Claims (1)

[Scope of utility model registration request] A front lever for operating the front derailleur and a rear lever for operating the rear derailleur are provided, and an interlocking mechanism is provided between these levers, so that when the rear lever is operated, the front lever is actuated to control the front derailleur. A speed change operation device that operates a railer, wherein the front lever is constituted by a lever body, a winding body that locks an operating wire, and a lever shaft that operates in conjunction with the rear lever, and the front lever A one-way rotation transmission mechanism is provided between the shaft and the winding body to transmit the rotation of the lever shaft by the rear lever in a direction opposite to the direction in which the return spring of the front derailleur is pulled, to the winding body; Further, the lever body and the winding body are provided with an interlocking portion that transmits the rotation of the lever body in a direction opposite to the tensioning direction of the return spring to the winding body, A bicycle speed change operation device, comprising a release body that releases the one-way rotation transmission mechanism when the return spring rotates in the tension direction.