JPH0671915B2 - Bicycle chain transfer device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a bicycle chain shifting device, and more particularly, to a chain gear of a multi-stage chain gear device including at least two chain gears having different numbers of teeth. The chain is displaced in the axial direction of the chain gear from the chain line when the chain meshes with the chain gear to the chain line of another chain gear adjacent to the chain gear, and the chain is moved to the chain gear adjacent to the chain gear. The present invention relates to a bicycle chain changing device for changing a bicycle.

(Prior Art) Generally, in a bicycle, a chain changing device used together with mounting a front side multi-stage chain gear mounted on a crank is a fixing member for fixing to a seat tube of a frame as described in Japanese Utility Model Publication No. 55-54623. And a chain guide including two guide plates, and two link members that support the movable member with respect to the fixed member so as to be movable in the axial direction of the chain gear. Is moved via an operation wire stretched between the movable side member and the operation lever of the switching operation device, and the guide plate of the chain guide hooks one of the chain gears in the front side multi-stage chain gear device. The chain to be installed is configured to be pressed in the axial direction of the chain gear to be hooked.

In addition, the rear chain changer supported on the rear hub is
As described in Japanese Patent Laid-Open No. 56-52150, a movable member provided with a chain changing frame including a fixing member for fixing to a hawk end of a frame, two pulleys and a pulley plate supporting these pulleys, and the movable member. The link member comprises two link members that support the member so as to be movable in the axial direction of the chain gear with respect to the fixed member, and the movable member is stretched between the movable-side member and the operation lever of the shifting operation device. It is configured such that the chain hooked on one of the chain gears in the rear-side multi-stage chain gear device is pushed in the axial direction of the chain gear to be hooked by the pulley in the chain hooking frame.

(Problems to be solved by the invention) However, in the conventional chain changing device, particularly when changing the chain from the small diameter chain gear to the large diameter chain gear, the operation lever of the chain changing operation device is changed from the large chain gear to If you do not operate the stroke more than the operation stroke when you change the chain to the small diameter chain gear, you can securely change the chain, so there is a problem that the chain cannot be changed smoothly when the operation stroke is insufficient. If the pedal driving force, that is, the chain tension is excessive when traveling uphill, it is difficult to change the chain, and the operation of the speed change lever is heavy, and the structure is very complicated and the cost is high. There is a problem, and in the case of the front chain changing device, the guide plate of the chain guide slides into contact with the chain when changing the chain, apart from the above problems. There is a problem that a large sliding contact noise is generated and the guide plate is worn.

The object of the present invention is to be able to smoothly perform even when switching from a small-diameter chain gear to a large-diameter chain gear, and moreover, even when the chain tension is excessive such as when traveling uphill, the pedal driving force is not affected by the chain tension force. It is possible to easily and smoothly change over by using, and to simplify the structure and to eliminate the noise when changing over the chain.

(Means for Solving the Problems) Therefore, according to the present invention, in a multi-stage chain gear device including at least two chain gears having different numbers of teeth, a chain hung on one of the chain gears is provided. A bicycle chain shifting device for a bicycle, which shifts the chain in the axial direction of the chain gear from a chain line when meshing to a chain line of another chain gear adjacent to the chain gear, and shifts the chain to a chain gear adjacent to the chain gear. A shift body having a shift portion having at least one guide surface for guiding a chain meshing with one chain gear to teeth of a chain gear adjacent to the chain gear meshing with the chain gear, together with the chain gear or the chain gear. The shift member includes a chain line of the chain gear and a chain line of the chain gear. While supporting the chain movably over a chain line of another chain gear adjacent to the gear, the shift body, the shift portion enters the chain line of the chain gear with which the chain meshes, and the chain at the guide surface, There is provided a moving means for guiding the chain gear engaged with the chain to another chain gear adjacent to the chain gear and moving the chain gear to a chaining position where the chain gear is chained.

(Operation) When a chain that meshes with one chain gear is replaced with a chain gear that is adjacent to the chain gear that meshes with the chain, the shift body that rotates together with the chain gear by operating the moving means is adjacent to the chain gear with which the chain meshes. The shift portion of this shift body is moved to the chaining position of another chain gear to enter the chain line of the chain gear with which the chain meshes, and by this entry, the shift portion co-rotates with the chain gear of the shift body. Since the chain that meshes with the chain gear can be caught by the guide surface before the meshing, and the chain can be engaged with the chain gear by pushing the chain from the chain gear that meshes with the chain to another adjacent chain gear by the driving force of the pedal. Therefore, switching from this one chain gear to another adjacent chain gear will increase the driving force of the pedal. Therefore, even when switching from a small-diameter chain gear to a large-diameter chain gear, or when the pedal driving force, that is, when the chain tension is excessive, such as when climbing uphill, the chain tension force does not affect the chain driving force. Since it is possible to easily and smoothly change the chain, and because the shift body is supported by the chain gear or the rotating member that rotates together with the chain gear, the chain is changed using the driving force of the pedal. There is no noise when changing chains, and the structure is simple.

Embodiment An embodiment of the device of the present invention will be described below with reference to the drawings.

The device of the present invention may be used with a front-side multi-stage chain gear device mounted on a bicycle crank or may be used with a rear-side multi-stage chain gear device mounted on a rear hub.

In the embodiment shown in FIGS. 1 to 8, a front side multi-stage chain gear device (A) consisting of a small diameter chain gear (1) having a small number of teeth and a large diameter chain gear (2) having a large number of teeth. The chain (C) hung on the small-diameter chain gear (1) or the large-diameter chain gear (2) in this multi-stage chain gear device (A) is used as the small-diameter chain gear (1). First when engaging
The chain line (L ₁ ) is displaced in the axial direction of the chain gears (1) and (2) over the second chain line (L ₂ ) of the other large-diameter chain gear (2) adjacent to the small-diameter chain gear (1) to displace the chain. (C) is a large-diameter chain gear (2) adjacent to the small-diameter chain gear (1) to the small-diameter chain gear (1), or a small-diameter chain gear (1) adjacent to the large-diameter chain gear (2) from the large-diameter chain gear (2). The first guide surface (3) for guiding the chain (C) meshing with the small diameter chain gear (1) to the teeth of the large diameter chain gear (2) adjacent to the small diameter chain gear (1).
1) and chain (C) that meshes with large diameter chain gear (2)
To form a shift body (3) having a shift portion (3c) having the large diameter chain gear (2) and a second guide surface (32) for guiding the teeth of the small diameter chain gear (1) adjacent thereto. The shift body (3) is supported on the outer surface of the large-diameter chain gear (2), and between the shift body (3) and the crank arm (4) of the crank that supports the multi-stage chain gear device (A). In addition, the shift portion (3c) includes a first chain line (L ₁ ) of the small diameter chain gear (1) and a second chain line (L ₂ ) of the large diameter chain gear (2) adjacent to the small diameter chain gear (1). While supporting the shift body (3) so that the shift body (3) is moved by the shift portion (3c),
Chain gear (1) or (2) with which the chain (C) meshes
Entering the chain line (L ₁ ) or (L ₂ ) of the chain and adjoining the chain (C) at the guide surface (31) or (32) to the small diameter chain gear (1) with which the chain (C) meshes. Guide the large-diameter chain gear (2) or the large-diameter chain gear (2) with which the chain (C) meshes and the small-diameter chain gear (1) adjacent to it.
First engaging position (B ₁ ) for engaging the small diameter chain gear ( ₁ )
Or than is provided moving means for moving the second Kake換position changing multiplied in large Chengiya ₍₂₎ (B 2).

Therefore, the large-diameter chain gear (2) supporting the shift body (3) of the embodiment shown in FIGS. 1 to 8 has, for example, two adjacent teeth among a large number of teeth provided around the outer circumference thereof. The tooth is cut away from the center of the tooth in the radial direction to form a cutout portion (21), while the outer surface (2a) of the large-diameter chain gear (2) is used to crank the crankshaft as shown in FIGS. A bracket (22) is attached near the arm (4) by a fixing means such as a mounting screw, and the shift body is attached to the bracket (22) via a pivot support bin (23) parallel to the outer surface (2a). (3) is pivotally supported so as to be movable in the axial direction of the large diameter chain gear (2).

Further, the shift body (3) of the embodiment shown in FIGS.
Is formed of a single metal plate, and extends from the attachment position to the bracket (22) along the outer surface of the large diameter chain gear (2) as shown in FIG.
And an intermediate portion (3b) bent from the tip of the base end portion (3a) toward the inner side in the axial direction of the large diameter chain gear (2).
And a shift portion (3c) extending from the tip of the intermediate portion (3b) in the same direction as the base end portion (3a).
c) is formed in a tapered shape, one side surface of which serves as the first guide surface (31) and the other side surface serves as the second guide surface (32).

Then, the shift body (3) is pivotally supported on the bracket (22) via a mounting cylinder (33) coupled to the base end thereof and the pivot pin (23), and the shift portion (3c) is This is performed by moving the large-diameter chain gear (2) from the lacking portion (21) in the axial direction of the large-diameter chain gear (2), and further, the shift body (3) and the bracket (22) or the large-diameter chain gear ( The shift body (3) between the crank arm (4) and the large-diameter chain gear (2).
A spring (5) biasing in the direction is interposed.

Further, the moving means in the embodiment engages with the restriction cam (6) having two cam surfaces provided between the shift body (3) and the crank arm (4) and the restriction cam (6). It comprises an engaging body (7), an operating body (8) for moving the engaging body (7), and a control body (9) for the operating body (8). The regulating cam (6) is connected to the shift body. The engaging body (7) is provided on the outer surface of the base end (3a) of (3).
Is provided on the crank arm (4).

As shown in FIG. 2, the restriction cam (6) has a low cam surface (61) having a short distance from the outer surface (2a) of the large diameter chain gear (2) and the low cam surface. A high-order cam surface (62) which is continuous with the surface (61) and has a long distance from the outer surface (2a), and the engagement body (7) is composed of a rollable regulation roller. The engaging body (7) is provided on the crank arm (4) via the actuating body (8) so as to be movable along the length direction of the crank arm (4). By moving the engaging member (7) to one of the lower cam surface (61) and the higher cam surface (62) to move the shift member (3) to the first and second interlocking positions (B). ₁ ) (B ₂ ).

Further, the actuating body (8) may be directly operated manually, but in this embodiment, the control body (9) is used, and the control body (9) is operated via the operation wire (W). The operating body (8) is moved by interlockingly connecting it to an operating lever (not shown) and operating the control body (9) by operating the operating lever.

Therefore, the control body (9) in the embodiment is orthogonal to the outer side surface of the large-diameter chain gear (2) and extends in an elongated shape along the outer side surface and the outer control surface (91). A control unit (9a) having a surface (92), and the control unit (9a)
a) A mounting portion (9b) that is bent from one end in the width direction and faces the outer side surface, and a wire fixing portion (9c) that extends outward from the edge of the mounting portion (9b). The (9b) is pivotally supported on the chain stay (S) of the bicycle frame via the bracket (10) and the mounting member (11).

Then, the operation wire (W) is fixed to the wire fixing portion (9c) of the control body (9), and the control body (9)
A spring (12) for urging the control body (9) in one direction is interposed between the bracket (10) and the bracket (10), and at the end of the crank arm tip side of the actuating body (8), A control roller (81) that engages with the inner and outer control surfaces (91) (92) of the control body (9) is provided, and when the crank arm (4) is driven clockwise in FIG. 8
By engaging the inner control surface (91) of (1), the control roller (81) is moved from the position of the moving locus (D ₁ ) in FIG. 1 to the second moving locus (D ₂ ) shown in (E) of FIG. ) To displace the engaging body (7) to the higher cam surface (62) as shown in FIG. 3 and the outer control surface (92) of the control roller (81) as shown in FIG. The engagement of the control roller (81) shown by the solid line in FIG. 5 from the position of the second movement locus (D ₂ ) in FIG.
The engaging body (7) is engaged with the lower cam surface (61) as shown in FIG. 6 by displacing it to the first movement locus (D ₁ ) position shown in FIG. Also, the bracket (1
At (0), stoppers (13) and (14) for restricting the swing range of the control body (9) are provided.

Further, in the embodiment shown in FIGS. 1 to 9, when the shift body (3) is advanced to the first shift position (B ₁ ) as shown in FIG. 3, the position shown in FIG. Since the shift body (3) may interfere with the chain stay (S) when passing through the chain stay portion by rotating clockwise from the second,
As shown in the figure, the cam body (6) is provided with a withdrawal cam surface (63) continuous with the high cam surface (62), and as shown in FIG. 1, the mounting member (11) is provided with the control member. A retracting body (15) engageable with the roller (81) is provided, and after shifting the chain by the shift body (3) that has entered the first shifting position (B ₁ ) as shown in FIG. 3, the shift is performed. The body (3) is retracted from the first engaging position (B ₁ ) in FIG. 3 to the outer position of the large diameter chain gear (2) shown in FIG. In the case of FIG. 4, the control roller (81) of the actuating body (8) attached to the crank arm (4) is in the position of FIG. 1 (F).

The retracting body (15) is composed of a plate body having a guide surface (15a) engageable with the control roller (81) as shown in FIG. 1. The retracting body (15) is provided with the guide surface. (15a) is arranged at a position closer to the center of the large diameter chain gear (2) than the position of the second movement locus (D ₂ ) of the control roller (81). A retracting mechanism such as the retracting body (15) is not always necessary. In this case, for example, the chain stay (S)
In addition, a recess is provided to prevent interference with the shift body (3).

Further, the crank arm (4) is provided with a pair of guide pins (41) and (42) projecting from the crank arm at predetermined intervals in the lengthwise direction thereof and is provided with a guide plate (43). 8)
Is provided with a pair of elongated holes (82) (83) that engage with the guide pins (41) (42), and the edge of the support portion of the engaging body (7) is provided with the guide plate as shown in FIG. The actuator (8) is brought into contact with (43) so that the actuating body (8) is guided so as to slide smoothly in the longitudinal direction of the crank arm (4).

Further, in the figure, (O) is an outer tube for guiding the operation wire (W).

Next, the operation of the shifting device configured as described above will be described.

When the chain (C) is engaged with the small-diameter chain gear (1), the engagement body (7) has the lower cam surface (61) as shown in FIG.
, And the shift body (3) is in the second shifting device (B ₂ ) as shown in FIG. Further, the control body (9) is at the second and third movement loci (D ₂ ) (D ₃ ) positions as shown in FIG. 5, and the actuating body (8) is at the position shown in FIG. 5 (H).

From this system, the chain (C) is replaced with a large diameter chain gear (2).
In the case of switching to, the operation lever is moved forward and the operation wire (W) is pulled to move the control body (9) to the second and third movement loci (D ₂ ) (D ₃ ) of FIG. The position is displaced to the first movement locus (D ₁ ) position as shown in FIG.

In this state, when the operating body (8) located with the crank arm (4) in the position shown in FIG. 5 (H) rotates clockwise in FIG. 5, the control roller for the operating body (8) provided on the crank arm (4). (81) engages with the inner control surface (91) of the control body (9) shown in FIG. 1 to move from the first movement locus (D ₁ ) position to the second position.
It is displaced to the movement locus (D ₂ ) position (position (E) in FIG. 1), and at the same time, the actuating body (8) moves to the center side of the large diameter chain gear (2) and is provided on the actuating body (8). The engagement body (7) engages with the high cam surface (62) from the state of FIG. 2 as shown in FIG. 3,
The shift body (3) enters the first switching device (B ₁ ). The operation of the shift body (3) is performed while the shift body (3) is not in contact with the chain (C), in other words, in the non-meshing region of the chain (C) with the chain gear (1). Therefore, the shift body (3) can be operated without being affected by the chain (C).

Then, the shift body (3) is rotated by driving the crank arm (4) in the clockwise direction of FIG. 1 or the chain gear (1) (rotated in the clockwise direction of FIG. 1 by transmitting the driving force from the rear wheels). By the rotation of 2), the part of the chain (C) on the entry side to the small diameter chain gear (1) is caught by the shift body (3) and rides on the first guide surface (31) as shown in FIG. The chain (C) is guided to the second chain line (L ₂ ) side along the first guide surface (31), and the chain (C) is forcibly disengaged from the small diameter chain gear (1),
As shown in FIG. 3, the chain is replaced with a large diameter chain gear (2).

In this case, when the crank arm (4) shown by the chain line in FIG. 1 approaches the chain stay (S) again as shown by the chain line in FIG.
The control roller (81) at the second movement locus (D ₂ ) position is the first
The actuating body (8) which engages with the guide surface (15a) of the retractable body (15) shown in the figure and rotates together with the crank arm (4) moves toward the center side of the large diameter chain gear (2). (FIG. 1 (F) position), the engaging body (7) provided on the actuating body (8) is disengaged from the higher cam surface (62) shown in FIG. 63), the shift body (3) retracts to the outside of the large diameter chain gear (2) with respect to the large diameter chain gear (2) as shown in FIG.
Therefore, it is possible to prevent the shift body (3) from interfering with the chain stay (S) and being damaged.

Further, when the chain (C) hooked on the large diameter chain gear (2) as described above is again hooked to the small diameter chain gear (1), the operation wire (W) in FIG. 1 is loosened by the returning operation of the operation lever. Then, the control body (9) swings counterclockwise in FIG. 1 by the force of the spring (12) and is displaced to the _second, third movement loci (D ₂ ) (D ₃ ) positions as shown in FIG. To do.

In this state, when the crank arm (4) at the position shown in FIG. 1 (F) is driven clockwise in FIG. 1, the control roller (81) provided on the crank arm (4) causes the control body (shown in FIG. 9) It is engaged with the outer control surface (92) and is displaced from the _{second and} third movement loci (D ₂ ) (D ₃ ) positions to the first movement locus (D ₁ ) position shown in FIG. 5 (H). At the same time, the actuating body (8) is displaced outward in the radial direction of the large-diameter chain gear (2) to cause the actuating body (8) to move.
The engaging body (7) provided on the upper side is engaged with the lower cam surface (61) of FIG. 6 from the engaging portion with the retracted cam surface (63) of FIG. 4 through the high cam surface (62) of FIG. And the shift body (3) is
From the state of FIG. 4 retracted with respect to the large-diameter chain gear (2) to the state of FIG. 3, it advances to the second engagement position (B ₂ ) as shown in FIG.

Then, by rotating the shift body (3) by driving the crank arm (4) from the position shown in FIG. 5 (H) in the clockwise direction, a portion of the chain (C) on the entry side into the large diameter chain gear (2). Is caught by the shift body (3) and rides on the second guide surface (32), and the chain (C) is driven by the pedal to drive the first chain line (L) along the second guide surface (32). Guided to the ₁ ) side, the chain (C) is forcibly disengaged from the large diameter chain gear (2) and hooked to the small diameter chain gear (1) as shown in FIG. In this case, the shift body (3) is restricted to the second engaging position (B ₂ ).
In this case as well, the operation of the shift body (3) is the same as when shifting from the small diameter chain gear (1) to the large diameter chain gear (2), but not in mesh with the large chain chain gear (2) of the chain (C). Since it is performed in the area, the shift body (3) can be operated without being affected by the chain (C).

As described above, since the shift body (3) rotates together with the chain gears (1) and (2) when the chain (C) is engaged, the chain driving force by the crank arm (4) or the driving force from the rear wheels is transmitted. Chain gear (1)
By utilizing the rotation of (2), the chain (C) can be forcibly moved to the chain gear (1) or (2) to be reengaged, and therefore the chain (C) can be reengaged smoothly. Even if the chain driving force, that is, the chain tension is excessive, it can be performed, and there is no problem of noise.

That is, a chain guide that guides a chain is moved in the axial direction of the chain gear like a conventional chaining device, and is pressed against the chain gear to be chained, and the contact resistance is used to move the chain tip of the chain gear. Lifted more outwards,
In the present invention, the chain (C) is hooked on the chain line of the chain gear to be bent and hooked, and the chain is hooked to the chain gear to be hooked. ) Is moved in the axial direction of the chain gears (1) and (2), and when the chain (C) meshes with the original chain gear, the chain (C) is caught and lifted above the teeth of the chain gear, It is prevented from meshing with the shift body (3) and is guided by the guide surface (31) or (32) of the shift body (3) to guide the chain to the chain line of the chain gear to be replaced. However, the shift body (3) can be operated in an area that does not contact the chain, so that the chain (C) is driven, for example. Even if it is not open, the transfer operation can be performed.

Moreover, the shift body (3) is composed of the crank arm (4).
Since it is mounted near the vehicle, in other words, it is provided in the region where the driving torque is the lowest, it is possible to shift the gears reasonably even when the chain driving force is large.

Although the shift body (3) is mounted near the crank arm (4) in the above embodiments, the shift body (3) may be provided at the same position as the crank arm (4) or at a remote position.

In addition, a control body (9) that operates by operating the operation wire (W)
And the actuating body (8) having the control roller (81) are used to move the shift body (3).
The control body (9) and the actuating body (8) may be eliminated, and the engaging body (7) may be moved by direct manual operation.
Further, an operating wire may be directly attached to the shift body (3), or a lever body may be provided on the shift body (3),
The lever body may be directly moved, or the shift body (3) may be directly manually moved, or electrically operated by using a solenoid. The moving means may be configured as described above or may be configured to be operated by the force of the foot by using the foot of the driver, and the moving means is not particularly limited.

Further, the regulating cam (6) and the engaging body (7) are used together with the control body (9) and the actuating body (8) as moving means for moving the shift body (3). 6) and the engaging body (7), a positioning mechanism including two concave engaging portions and a locking body that selectively engages with one of the engaging portions, or a torsion spring is used to move to the engaging position. The moved shift body (3) may be stopped at the hooked position, or the operation wire (W) may be directly attached to the shift body (3) and the operation lever side may be used. It may be formed so that the shift body (3) stops at the engaging position.

Further, the shift body (3) is pivotally supported and the guide surface side portion thereof is moved in the axial direction of the chain gears (1) and (2), but the chain gear (1) is not pivotally supported. ) (2) may be supported so as to be movable in the axial direction.

Although the shift body (3) is supported by the large diameter chain gear (2), it may be supported by the small diameter chain gear (1).
Further, it may be supported by a rotating member such as a protector for preventing the crank arm (4) or the chain from falling off.

Although the large-diameter chain gear (2) is provided with the missing tooth portion (21), the missing tooth portion (21) is not always necessary. In this case, the shift body (3) is moved in the axial direction from a position outside the tips of the teeth of the large diameter chain gear (2).

Further, in the above embodiments, the first and second guide surfaces (31)
One shift body (3) having (32) is provided, and this shift body (3) is inserted into the first and second shifting positions (B ₁ ) and (B ₂ ) and the chain is changed. However, in addition, as shown in FIG. 10, the first shift body (3a) having the first guide surface (31a) is provided.
a) and a second shift body (3) having a second guide surface (32a)
b) and are used to convert these shift bodies (3a) and (3b) into
As in the case of the embodiment shown in FIG. 9, it may be pivotally supported on the outer surface of the large diameter chain gear (2). In this case, operating wires are attached to the shift bodies (3a) and (3b), and these operating wires are connected to a pair of operating levers to connect the shift bodies (3
a) (3b) may be independently operated.

Further, the device of the present invention is, of course, not limited to the case of changing the chain to one of the chain gears in the front side multi-stage chain gear device,
The same configuration can be applied to the case where the chain is replaced with one of the chain gears in the rear-side multistage chain gear device.

As described above, according to the present invention, the shift body is introduced into the chain line, and after the shift body comes into contact with the chain moving the chain line, the chain is hung by using the driving force of the pedal. Since the chain can be hooked by pushing in the changing direction, it can be easily and smoothly hooked when changing from a small-diameter chain gear to a large-diameter gear or when the chain tension is excessive, such as when traveling uphill. In addition, since the shift body is supported by the chain gear or the rotary member that rotates together with the chain gear and the chain is reengaged by using the driving force of the pedal, the noise when the chain reengages can be eliminated. Moreover, the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the device of the present invention, FIG. 2 is a sectional view taken along line XX in which a part of FIG. 1 is omitted, and FIG.
FIG. 4 is an explanatory view showing a state where the shift body in the position shown in FIG. 3 is moved to the first engagement position, FIG. 4 is an explanatory view showing a state in which the shift body in FIG. 3 is retracted from the second engagement position, and FIG. The figure is a front view corresponding to FIG. 1 when the chain is hung on a large diameter chain gear, FIG. 6 is a plan view with a part omitted in FIG. 5, FIG. 7 is a side view in FIG. FIG. 8 is a perspective view of only the shift body, FIG. 9 is a bottom view in which a part of FIG. 1 is omitted, and FIG. 10 is a perspective view of only a main part showing another embodiment. (1) …… Chain gear (2) …… Chain gear (A) …… Multi-stage chain gear device (3) …… Shift body (B ₁ ) (B ₂ ) …… Replacement position (L ₁ ) (L ₂ ) …… Chain line

Claims (1)

[Claims] 1. A chain hung on one of the chain gears in a multi-stage chain gear device having at least two chain gears having different numbers of teeth, the chain being adjacent to the chain gear from a chain line when the chain meshes with the chain gear. A bicycle chain changing device for displacing the chain in the axial direction of the chain gear over a chain line of another matching chain gear, and changing the chain to a chain gear adjacent to the chain gear, wherein a chain meshing with one chain gear, A shift body having a shift portion having at least one guide surface for guiding a tooth of a chain gear adjacent to a chain gear meshed with the chain is provided on the chain gear or a rotary member that rotates together with the chain gear, and the shift portion is the chain gear. Chain line and a chain of another chain gear adjacent to the chain gear The shift body is movably supported on the inside, and the shift portion is adjacent to a chain gear with which the shift portion enters the chain line of the chain gear with which the chain meshes and the guide surface allows the chain to mesh with the chain gear. A bicycle chain changing device for bicycles, characterized in that it is provided with a moving means for guiding it to another chain gear and moving it to a changing position where it is changed to the chain gear.