JPH0911971A - Wire operating device for speed change gear of bicycle - Google Patents

Abstract

PURPOSE: To change a speed change stage even in the rotation of the same direction for improving operability by connecting a speed change gear operating wire from the speed change gear of a bicycle to a cam driven member which abuts against a cam member stopped by a braking means at a position corresponding to any speed change stage. CONSTITUTION: A wire W is always subjected to tension by a spring provided in a speed change gear, so that a roller 21 in a cam driven member 2 always abuts against a cam member 1. Then, a shaft part of the cam member 1 is formed integrally with an operating member 3 while the cam member 1 is formed on one side 13 with recesses 131-134 at 90 deg. intervals, and ball engaging devices 5 are provided in two recesses at a 180 deg. interval. Thus, the roller abuts against the cam member 1 at the position remotest from a shaft part of the cam member 1 in a position P1 to set the lowest speed stage. In a position P2 or P4, a medium speed stage is set and in a position P3 the roller 21 abuts against the cam member 1 at the position nearest to the shaft part of the cam member 1 to set the highest speed stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle transmission wire operating device for setting the speed of a bicycle transmission.

[0002]

2. Description of the Related Art Normally, in a bicycle transmission, a shift speed is changed by pulling or loosening an operation wire connected thereto. A wire operating device for pulling and loosening the operating wire is provided at an appropriate position such as a bicycle handle. This operating device generally includes, for example, two operating units in the form of a lever, and includes a ratchet mechanism, a wire winding member, and the like inside.When one operating unit is operated in one direction, a wire is used. Is retracted, and the operation of the other operation unit allows the pulled-in wire to be fed out to the transmission side. Usually, the wire is fed by the tension of a spring provided in the transmission.

[0003]

However, in such a conventional wire operating device for a bicycle transmission, the gear speed changed by performing the winding (pulling) operation of the wire using one of the operation units is changed to the original gear speed. When changing back, it is necessary to operate the other operating section to return, and when changing the gear stage that has been returned again, the wire operation must be performed again using the one operating section.

As described above, the conventional wire operating device requires a separate operation unit when changing the speed from the low speed to the high speed or from the high speed to the low speed, so that the operation is cumbersome. Poor. Also, in terms of structure, it is a complicated structure having a large number of parts having two operation units, requires much labor for manufacturing, and is expensive accordingly.

Accordingly, an object of the present invention is to provide a wire operating device for a bicycle transmission, which has better operability than conventional ones, has a simple structure, and can be provided at low cost.

[0006]

A wire operating device for a bicycle transmission according to the present invention which solves the above-mentioned problems is a cam follower member to which a transmission operating wire from a bicycle transmission is connected. A cam driven member that is movable in a direction for adjusting the amount of wire drawing and drawing, and a cam member that is rotatable in both reciprocation at a fixed position, and the cam driven member is drawn out of the wire with respect to the transmission by rotation.
A cam member for driving in the direction of adjusting the retraction amount,
The cam operating member for rotating and operating the cam member and the cam member, when not operated, reoperably stopped at a predetermined position for setting the wire payout or retraction amount corresponding to the gear stage of the transmission. And a braking means for

Here, "the cam member is capable of rotating in both reciprocating directions" means that the cam member can rotate not only in less than 360 ° but also in more than one rotating direction. The following can be exemplified as the cam member. (1) An eccentric rotating member (so-called plate cam, peripheral cam, etc.) in which a cam contour curve is formed on the outer peripheral side surface. (2) An eccentric rotation member having a ring-shaped portion on the inner peripheral surface of which a cam contour curve is formed. (3) A so-called grooved cam having a cam groove into which the cam follower fits.

The following can be exemplified as the cam driven member. While being brought into contact with the cam contour curve of the cam member of (1) or (2), the cam member is driven along the guide member as the cam member rotates. When this cam follower is employed, a transmission operation wire can be connected thereto.

In this case, as means for keeping the cam follower member in contact with the cam member, when the transmission operation wire is tensioned toward the transmission, this wire tension is used. Can be abutted. In addition, it is conceivable to separately provide a spring force applying means for keeping the cam follower member in contact with the cam member. A cam member which is oscillated with rotation of the cam member while being brought into contact with a cam contour curve of the cam member according to (1) or (2).

[0010] The cam driven member has, for example, a driven portion for contacting and following the cam contour curve of the cam member and a wire connecting portion for connecting a wire from the transmission, and is capable of swinging. Provided ones (for example, lever-shaped ones) can be mentioned. In this case, it is preferable that a distance between the swing center and the driven portion is set shorter than a distance between the swing center and the wire connecting portion. With this setting, it is possible to obtain a large operation amount of the wire connecting portion and therefore a large wire operation amount for the small operation amount of the driven portion abutting on the cam member. Can be changed, the cam member can be formed in a small size, and the whole can be reduced in size and size.

When the cam follower is used, the cam follower is kept in contact with the cam member when the transmission operating wire is under tension toward the transmission. Can be brought into contact using this wire tension. In addition, it is conceivable to separately provide a spring force applying means for keeping the cam follower member in contact with the cam member. The cam follower member of the cam member (groove cam) in (3) is one in which at least a part is fitted in the cam groove.

Regarding this cam follower member, a wire may be directly connected to it, or it is conceivable to connect the wire to the cam follower member which is driven to swing as described above. In any case, the cam member and the cam operating member are externally fitted to the pipe member so that the cam member and the cam operating member can be rotated around the pipe member that constitutes the bicycle handlebar in order to make the entire device compact, compact, and easy to operate. It is possible to form it.

In this case, in order to further improve the operability, the cam operating member may also serve as the grip portion of the bicycle handle, or the cam operating member may be disposed adjacent to the bicycle handle grip portion to thereby improve the operability of the pipe member. It is conceivable to configure so as to be able to rotate around. The latter is preferred in terms of safety. In any case, the cam member and the cam follower may be housed in a housing attachable to, for example, a bicycle handle. The cam member and the cam follower may be provided directly on a bicycle main body such as a bicycle handle, or at least one of the cam member and the cam follower may be supported by the housing.

The braking means for the cam member includes: a) a friction member which is brought into pressure contact with the cam member under the pressing force of a spring or the like; b) a braking member which comes into frictional contact with the cam member; c) ) The engaging portion (engaged recess, engaged projection, etc.) provided on the cam member can be disengaged and re-engaged according to the rotation operation or other operations of the cam member for changing the gear position. Including a ball, a claw or other engaging portion which is constantly pressed toward the cam member by an external force of a plate spring, a compression spring or another spring, etc. d) Conversely, An example in which a similar engaging portion is provided, and a similar engaged portion is provided on the same, and e) a combination of the above c) and d) can be exemplified.

[0015] Of the parts or portions of the braking means, those provided to the cam member can be provided on a bicycle main body such as a bicycle handle or the housing.

[0016]

A wire operating device for a bicycle transmission according to the present invention is mounted on a bicycle main body such as a bicycle handle. A transmission operating wire from the bicycle transmission is connected to a cam driven member, and the cam driven member is a cam. The cam member is brought into contact with the member, and the cam member is stopped by the braking means at a position corresponding to any of the shift speeds.

In changing the gear position of the transmission,
The cam member is turned in either direction by manual operation of the cam operating member, and the cam driven member abutting on the cam member is driven in a direction for adjusting the amount of the wire fed or drawn into the transmission, and accordingly, The wire pays out,
Alternatively, the transmission is set to the next lower gear position on the low-speed side or high-speed side, and when the operation of the cam operating member is stopped, the cam member is stopped so as to be re-operable at that position by the braking means.

According to the wire operating device of the present invention, the cam member is turned only in one direction or turned in the opposite direction to, for example, the highest speed stage, one or more intermediate speed stages, the lowest speed stage, and again. It is also possible to sequentially circulate the gear stages such as the highest speed stage, or to rotate the cam member reciprocally as needed to, for example, move from the highest speed stage to one or more intermediate speed stages,
In addition, change the reciprocating speed from the lowest speed to the intermediate speed and the highest speed again, change from the highest speed to the intermediate speed, change to the highest speed again, and reciprocate between two or more intermediate speeds. The gear stage can be changed by reciprocating operation. Thus, even if the cam member is reciprocated by the cam operating member or the cam member is turned only in the same direction, the gear stage can be changed, so that the operability is good.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of the present invention as viewed from a bicycle rider, with a housing partially cut away.
FIG. 2 is a sectional view taken along line XX of FIG. The wire operating device for a bicycle transmission shown in FIGS. 1 and 2 has a disc-shaped cam member 1 and a lever-shaped cam follower member 2 that abuts the cam member 1.
It has. These are accommodated in a housing 6, and the cam member 1 is rotatably supported by the housing 6 via a bearing 61 by an eccentric shaft 11 integrated with the cam member 1. The cam follower 2 is swingably supported by a shaft 20 erected on the inner surface of the housing.

The peripheral surface 12 of the cam member 1 provides a cam profile curve, while the cam follower 2 rotatably supports a roller 21 at one end as a cam follower and a wire at the other end. The connecting portion 22 is provided. The shaft rod 20 supporting the cam driven member 2 supports the member 2 at an intermediate portion between the roller 21 and the wire connecting portion 22, and from the swing center of the member 2 by the shaft rod 20 to the roller 21. , More precisely, the distance between the roller 21 and the contact point between the cam member 2 is set shorter than the distance from the swing center to the wire connecting portion 22.

The operating member 3 is formed integrally with the shaft 11 of the cam member 1. The bearing 61 is prevented from falling off by the bearing cover 4 which is fitted through the cam operating member 3 and fixed to the side surface of the housing. On one side surface 13 of the cam member 1, a total of four recesses 131, 1 at 90 ° intervals on a circle concentric with the rotation center line of the member 1.
32, 133 and 134 are formed, of which a ball engaging device 5 is provided for each of the recesses arranged at two predetermined positions spaced by 180 °.

Each ball engaging device 5 includes a small cylinder 51 fixed on the inner surface of the housing 6 and a spring 5 built therein.
2. Includes a ball 53 that is pushed by the spring 52 and partially protrudes out of the cylinder. When each ball 53 faces the recess 131, 132, 133 or 134 on the cam member 1, it can be fitted into and engaged with the recess to stop the positioning of the cam member 1 at that position.
Is forcibly started to rotate, and is pushed by the flat side surface of the cam member to retreat into the cylinder 51 to allow the cam member 1 to continue rotating.

That is, here, the recesses 131 to 134 and the ball engaging device 5 constitute a braking means capable of re-operating (re-rotating) the cam member 1. The mutual arrangement relationship between the four recesses 131 to 134 on the cam member 1 and the pair of ball engaging devices 5 is such that the cam member 1 sets a position P1 ( A position indicated by a solid line in FIG. 2, and FIG. 3A), a position P2 or P4 for setting a middle speed stage (a position indicated by a two-dot chain line in FIG. 2, FIG. 3B)
) And a position P3 (a position shown by a two-dot chain line in FIG. 2; see FIG. 3C) for setting the highest speed stage.

The above-mentioned cam member 1 and the shaft 1 integral therewith
1 and the cam operating member 3 have a circular cross section through the center line of the shaft 11 so that they can be fitted onto the pipe member 7 constituting the bicycle handlebar with a predetermined gap.
0 is formed. It is also conceivable that an operation lever is protruded from the shaft portion 11 and a cam operation member is constituted by the shaft portion 11 and the lever.

The housing 6 has a hole 63 for allowing the pipe member 7 to pass therethrough in a wall opposite to the cam operation member 3.
The outer wall of the wall has a band portion 64 for holding the outer periphery of the pipe member 7 and fixing the housing 6 to the pipe member 7. The wire operating device described above is inserted into the pipe member 7 from the end 71 corresponding to the handle grip of the pipe member 7 constituting the bicycle handle. At this time, the pipe member 7 is sequentially penetrated through the housing band 64, the housing wall hole 63, the cam member 1 and its shaft 11, and the hole 10 of the cam operating member 3. Also, the shaft 1
A bearing 61 is fitted between the housing 1 and the housing 6 and is prevented from coming off by the bearing cover 4. A wire W from a transmission (not shown) is connected to the wire connecting portion 22 of the cam driven member 2. At this time, the wire W continues inside and outside the housing via the wire passage hole 66 of the housing 6.

The housing band 64 is finally fixed to the pipe member 7 with bolts and nuts 65. A handle grip H is fitted to the end 71 of the pipe member 7. In this state, the cam operating member 3 and the grip portion H are adjacent to each other, so that the operating member 3 can be easily operated.

Here, the wire W is constantly receiving a pulling force by a spring provided in a transmission capable of three-speed shifting, whereby the roller 21 of the cam driven member 2 is always in contact with the cam member 1. In order to prevent the roller 21 from being separated from the cam member 1 even by vibration during running of the bicycle, for example, a winding spring 200 inserted into the swing shaft 20 of the cam driven member 2
A spring force (see FIG. 2) or the like may be applied to the cam follower 2 to force the roller 21 to abut the cam member 1.

The connection of the wire W to the cam follower 2 is performed so that the following state is obtained. When the cam member 1 assumes the position P1 shown in FIG.
In other words, the lowest speed is set when the roller 21 comes into contact with the portion farthest from the shaft portion 11 on the side peripheral surface 12 of the cam member 1 and the wire connecting portion 22 draws the wire W into the housing 6 most. When the cam member 1 assumes the intermediate position P2 or P4 shown in FIG. 3B, the middle gear is set, and when the cam member 1 assumes the position P3 shown in FIG. When the roller 21 abuts on a portion of the peripheral side surface 12 closest to the shaft portion 11 and the wire connecting portion 22 draws the wire W out of the housing 6 most, the highest speed step is set.

In each gear position setting position, the roller 2
A shallow engagement recess into which the cam member 1 fits may be formed on the peripheral surface of the cam member 1. At this time, the above-described spring 200 or a spring having the same purpose may be used in combination. In the state described above, when changing the gear position of the transmission, the cam member 1 is rotated in either direction by manual operation of the cam operating member 3, and the cam follower member 2 abutting on the cam member 1 is shifted. The wire W is driven in the direction of adjusting the amount of feeding or retraction of the wire W, and accordingly, the wire W is fed or retracted, and the transmission is set to the next speed shift position on the lower speed side or higher speed side than the current shift speed, Then, when the operation of the cam operating member 3 is stopped, the balls 53 of the pair of ball engaging devices 5 engage with the two recesses (two out of 131 to 134) on the cam member 1, and the cam member 7 Stop operably in position.

According to this wire operating device, the cam member is rotated only in one direction or in the opposite direction, for example, the highest speed stage (see FIG. 3C) and the intermediate speed stage (see FIG. 3B). )), The lowest speed (see FIG. 3 (A)), and the highest speed again, the gears can be sequentially circulated, or the cam member 1 can be appropriately reciprocally rotated to, for example,
Reciprocating operation, such as changing from the highest speed stage to the intermediate speed stage, further to the lowest speed stage, and back again to the intermediate speed stage and the highest speed stage, or from the highest speed stage to the intermediate speed stage and back again to the highest speed stage It is also possible to change gear positions. Thus, the cam operating member 3
Thus, the gear can be changed from the currently set gear to any desired gear, even if the cam member 1 is reciprocated or turned only in the same direction, so that the operability is good.

In this wire operating device, the distance from the swing center of the cam driven member 2 to the roller 21 is set shorter than the distance from the center to the wire connecting portion 22. Since the wire operation can be performed by obtaining a large operation amount of the wire connecting portion 22 by the amount,
In order to obtain the operation of the roller 21 for changing the gear position, the cam member 1 can be formed in a small size, so that the entire apparatus can be reduced in size and size, and the operability is improved.

Since the cam operating member 3 is located next to the grip H of the bicycle handle, the operability is also good in this respect.
Note that the present invention is not limited to the above embodiment,
The present invention can be implemented in various other modes. For example, the above-described embodiment device corresponds to a three-speed transmission, but the present invention can also be applied to a transmission having a smaller or larger number of gear stages. In addition, the number of braking means, the braking position by the braking means, and the like can be appropriately changed according to the number of gears.

Also, the shape of the cam member, especially the cam contour curve, is not limited to a circle. For example, a shape other than a circular shape can be adopted according to the required movement amount of the wire or the like corresponding to the number of gears and the like. Further, the cam follower is not limited to the lever-shaped one. 4 and 5 illustrate another combination of the cam member and the cam follower member. The cam member 8 shown in FIG. 4 is a circular ring-shaped member 81 with an inner peripheral surface providing a cam profile curve.
Is fixed to one side surface of the disk 82, is provided so as to be eccentrically rotated around the pipe member 7, and the same lever-shaped cam follower member 2 as in the previous embodiment is provided.
Roller 21 is inscribed. However, in this case, the roller 2
1 is in contact with the ring-shaped member 81 by a tension spring S1 acting on the member 2.

The cam member shown in FIG. 5 is the same as the cam member 1 in the previous embodiment, but the cam follower member R is guided by the guide G and can reciprocate linearly, and the cam is driven by the spring S2 mounted on the guide. It comes into contact with the member 1. The wire W is directly connected to the member R.

[0035]

According to the present invention, it is possible to provide a wire operating device for a bicycle transmission which has good operability, has a simple structure, and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view of an embodiment of the present invention as viewed from a bicycle rider.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is an explanatory diagram of a shift speed change by the device of FIG. 1;

FIG. 4 is a view showing another example of a cam member and a cam follower member according to the present invention.

FIG. 5 is a view showing still another example of the cam member and the cam driven member in the present invention.

[Explanation of symbols]

1, 8 Cam member 2, R Cam follower 21 Roller (follower) 22 Wire connecting part 20 Swing shaft of member 2 Cam operating member 131-134 Cam member 1 constituting a part of braking means
Upper recess 5 Ball engaging device forming part of braking means 6 Housing 61 Bearing 4 Bearing cover 7 Bicycle handle pipe member W Transmission operation wire H Handle grip

Claims (4)

[Claims] 1. A cam follower member to which a transmission operating wire from a bicycle transmission is connected, the cam follower member being movable in a direction for adjusting the amount of feeding and retraction of the wire with respect to the transmission, and a fixed position. A cam member that can be rotated in both reciprocating directions, and a cam member for driving the cam driven member in a direction for adjusting the amount of drawing and drawing of the wire with respect to the transmission by rotating, and rotating the cam member. And a braking means for reoperably stopping the cam member when the cam member is not operated, at a predetermined position for setting the wire payout or retract amount corresponding to the gear stage of the transmission. A wire operating device for a bicycle transmission, characterized by being provided. 2. The cam follower has a follower for contacting and following the cam contour curve of the cam member and a wire connecting part for connecting the wire, and is swingably provided. The wire operating device for a bicycle transmission according to claim 1, wherein a distance between the swing center and the driven portion is set shorter than a distance between the swing center and the wire connecting portion. 3. The cam member and the cam operating member are externally fitted to the pipe member so as to be rotatable around the pipe member that constitutes the bicycle handlebar.
Or the wire operating device for a bicycle transmission according to 2. 4. The wire operating device for a bicycle transmission according to claim 3, wherein the cam operating member is arranged next to the grip portion of the bicycle handle so as to be rotatable around the pipe member.