WO1993019977A1

WO1993019977A1 - Gear shifter for bicycle

Info

Publication number: WO1993019977A1
Application number: PCT/JP1993/000387
Authority: WO
Inventors: Koichi Tagawa
Original assignee: Maeda Industries, Ltd.
Priority date: 1992-03-31
Filing date: 1993-03-29
Publication date: 1993-10-14

Abstract

A gear shifter for bicycles is provided for allowing a rider to carry out a shift operation reliably and comfortably by preventing or minimizing the occurrence of locking noise of a ratchet mecanism for the shifter body. The gear shifter includes a shifter body supported pivotally on a suitable portion of a bicycle frame, and a ratchet mechanism adapted to lock the shifter body in a predetermined pivotal position. A gear-shifting cable is rewound or payed out by turning the shifter body. The ratchet mechanism includes a wheel member (33) with a plurality of locking recesses (37a, 37b...), a locking body (34) adapted to be engaged elastically in order with these locking recesses in accordance with the pivotal movement of the shifter body, and buffer members (42) provided in some of the recesses for preventing a locking noise from occurring when the locking body engages a locking recess.

Description

Specification

[Title of the Invention]

Speed change device for bicycle

【Technical field】

The present invention relates to a bicycle shift operation device. More specifically, the present invention relates to a bicycle shift operation device capable of preventing the generation of unnecessary engagement noise of a step locking mechanism and performing a reliable shift operation.

[Background Art]

For example, the rear transmission is configured to move a chain guide that supports a guide pulley and a tension pulley in the axial direction of a multi-stage free wheel via a control mechanism such as a pantograph link mechanism. The chain is hooked on the freewheel after the tension pulley and guide pulley have been wrapped around it. Change to a sprocket. The Lyadylera operates by rotating a speed change lever connected via an operation cable.

The speed change lever usually has a boss-shaped base having a cable winding groove and a finger arm extending radially outward from the boss-shaped base, and the center of the boss-shaped base with respect to a frame. Is rotatably supported. When the arm is pushed to rotate the boss-shaped base, the operation cable is wound up or pulled out of the winding groove, so that the axial movement corresponding to the amount of rotation of the finger hook arm is performed on the cable. Given. The control mechanism such as the pantograph link mechanism is deformed in accordance with the axial movement amount of the operation cable. Is guided to the position. The chain guide is continuously moved in accordance with the operation of the shift operation lever, but the shift operation lever is moved so that the chain guide is guided to an optimum position for each sprocket, that is, a position immediately below each sprocket. Has very advanced technology to operate For example, if the chain guide is located at the midpoint between adjacent sprockets, the chain from the guide pulley to the freewheel The chain tilts and the chain contacts the guide plate, causing unpleasant gear noise. Therefore, the occupant must fine-tune the gearshift lever to eliminate the occurrence of gear noise and the accompanying vibration of the chain, and guide the chain guide to the optimal position for the desired sprocket. .

In order to improve the operability of such a shift operation lever, a shift operation incorporating a step lock mechanism such as a click mechanism that locks the operation lever stepwise at a rotation position corresponding to each shift position. An apparatus is provided. According to this, the chain guide or guide pulley is always guided to the optimal position for a predetermined sub-rocket, that is, the position immediately below the sprocket, at the turning position of the variable arrest operation lever locked with a sense of moderation. For this reason, it is possible for anyone to easily and accurately perform a quick shift operation.

Furthermore, in order to improve the shifting performance, a so-called overshift mechanism may be provided.

The above-mentioned overshift mechanism moves the chain guide by a large amount to bend the chain beyond a position immediately below a predetermined sprocket when performing a speed change operation, and this chain is adjacent to the sprocket that has been hung so far. The chain guide is quickly hooked on a desired large-diameter sprocket, and after the chain is fitted with the desired sprocket, the chain guide is slightly returned to prevent the chain from skewing due to the skew of the chain. The over-shift mechanism described above greatly improves the speed of shifting from small sprockets to large sprockets.

For example, a plurality of engagement members provided on the fixed side such as a lever shaft and the like so as to rotate together with the speed change operation lever, and the engagement members are sequentially engaged with the rotation of the speed change operation lever. In a click mechanism consisting of a click plate having a recess, a certain amount of play is provided around the lever axis between the click plate and the lever body, or the above-mentioned engaging body is provided with a certain amount of play around the lever axis. The above-mentioned overshift mechanism is constituted by holding the body so that it can be guided.

In the above-mentioned click mechanism, an engagement sound is generated when the engagement body engages with the engagement recess. Therefore, the above-mentioned click mechanism not only locks the gearshift lever in a predetermined rotation angle position stepwise with a sense of moderation, but also generates the above-mentioned engagement sound. It also has a function of making the occupant recognize that the shift operation has been performed.

However, in the click mechanism provided with the overshift mechanism, the shift operation lever is further rotated by a predetermined amount from the position where the click sound is generated, that is, the position where the engaging body and the above-mentioned self-engaging recess are engaged. I have to do it. On the other hand, the occupant often thinks that the speed change operation has been completed by generating the engagement sound, and stops the turning operation of the speed change operation lever when the engagement sound is issued. For this reason, the above-mentioned overshift function was not sufficiently exhibited, and the shift operability could not be sufficiently improved. .

In particular, the front transmission has a lower sprocket rotation speed than the rear transmission, and the above-mentioned gearshift lever must be held in the overshift position for a considerable time in order to exert the overshift function. . For this reason, it was difficult for the front transmission to make full use of the above-mentioned overshift mechanism.

Also, if the engagement sound of the click mechanism is too loud or the sound quality is poor, not only will it be difficult to give the shift operation device a luxury feeling, but also the discomfort to the occupant due to the shift operation will be made. It is also conceivable to give.

DISCLOSURE OF THE INVENTION

Therefore, an object of the present invention is to prevent the generation of unnecessary engagement sound in the step locking mechanism or to adjust the loudness and sound quality of the engagement sound so that a passenger can surely and comfortably perform a shifting operation. It is an object of the present invention to provide a bicycle shift operation device that can be operated.

The present invention includes a speed change operation body rotatably supported by a suitable portion of a bicycle frame, and a step locking mechanism for phase locking the speed change operation body at a predetermined rotation position. A bicycle shift operating device configured to tow or pull out a shift operating cable by turning operation,

The step locking mechanism includes: a locking body having a plurality of engagement recesses; and an engagement body that is sequentially and elastically engaged with the engagement recesses in accordance with a rotation operation of the speed change operation body. A buffer member is provided in a predetermined engagement recess of the locking body to prevent or suppress generation of an engagement sound when the engagement body engages with the engagement recess.

Other objects, features and advantages of the present invention will be described with reference to the accompanying drawings. The preference will be clear from the examples.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a speed change mechanism employing a speed change operation device of a first embodiment according to the present invention.

FIG. 2 is a plan view of the speed change operation device shown in FIG.

FIG. 3 is a sectional view taken along the axis of the speed change operation device of FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a partial cross-sectional view showing a main part of the speed change device of the first embodiment.

FIG. 6 is a diagram for explaining the operation of the speed change operation device of the first embodiment.

FIG. 7 is a sectional view taken along the line VII-VII in FIG.

FIG. 8 is an operation explanatory view for explaining the step locking mechanism.

FIG. 9 is an operation explanatory diagram for explaining the step locking mechanism.

FIG. 10 is an exploded perspective view showing a main part of a second embodiment according to the present invention.

FIG. 11 is a sectional view showing a main part of a second embodiment according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment according to the present invention will be specifically described with reference to the drawings.

As shown in Fig. 1, the bicycle is provided with a rear transmission 1a and a front transmission 1b, and the left and right gripping parts 4a, 4 The present invention is applied to the speed change operation devices 6a and 6b provided over the area b. Note that the following description is made for an example of the right shift operating device ⁶ b for actuating the pre-transmission lb. However, substantially the same configuration is adopted for the left shift operation device 6a for operating the rear transmission 1a.

As shown in FIGS. 2 and 3, the brake lever device 2b according to the present embodiment includes a brake bracket 8 provided so as to protrude forward from the front surface of the handlebar 3 toward the vehicle body. A base end is rotatably connected to a lever shaft 12 provided on the brake bracket 8, and a brake lever 13 is provided extending forward of the grip portion 4b. The brake cable W composed of the inner cable wl and the outer cable w2 used for the inner cable wl has an outer cable w2 which is screwed to the inner end of the brake bracket 8 in the vehicle width direction. While fixed to a The inner cable w1 is introduced into the internal space of the brake bracket 8, and the nipple 13a provided at the end thereof is fixed to the base end of the brake lever 13.

A cylindrical resin sleeve 17 that rotatably supports a cylindrical operation body 14 described below is provided around the handlebar 13 on which the brake lever device 2b and the speed change operation device 6b are mounted. It is fitted. On the other hand, at the base end of the brake bracket 8, there is provided a cylindrical mounting portion 10 having a slit 9 which cuts out a part of the peripheral wall and penetrates the inner and outer peripheries. The cylindrical mounting portion 1 is fitted over the outer peripheral portion of the resin sleeve 17 and the mounting portion 11 is screwed across the slit 9 to form the cylindrical mounting portion 10. The inner diameter is forcibly reduced, and the brake bracket 8 is attached to the handlebar 3 together with the resin sleeve 17.

As shown in FIGS. 2 and 3, the speed change device 6b according to the present embodiment is formed integrally with the brake lever device 2b from the brake bracket 8 to the outer periphery of the grip portion 4b. ing.

The speed change operation device 6b according to the present embodiment includes a cylindrical operation body 14 rotatably fitted around the outer periphery of the right grip portion 4b of the handlebar 3 in the axial direction, and the cylindrical operation device. A step locking mechanism 15 provided on the inner peripheral portion of the cylindrical mounting portion 10 of the brake bracket 8 inside the body 14 in the axial direction, and a support shaft 2 3 provided on the upper surface of the base end of the brake bracket 8 And a cable take-up reel 16 which is rotatably supported by the motor.

The cylindrical operation body 14 is rotatably supported on the outer periphery of a cylindrical sleeve body 17 fitted on the grip portion 4b of the handlebar 3, and is held by the occupant. The gripping operation part 18 that rotates by hand, and the gripping operation part '18 are integrally formed inside the vehicle width direction, and pulls or winds the drive cable K with respect to the cable winding reel 16. It is generally configured to include a drive reel section 19 that is provided, and a connecting section 20 that is connected to the locking mechanism 15 and operates the locking mechanism 15. A rubber outer jacket 21 is fitted around the outer periphery of the gripping operation section 18 so that a rider can easily grip it, and is formed such that the outer periphery of the grip 5 is substantially continuous with the outer circumference. Have been.

As shown in FIG. 7, the connecting portion 20 has an uneven connection at the inner end of the cylindrical operating body 14. It is formed by forming a denture 20a. When the connecting portion 20 of the cylindrical operating body 14 is engaged with the connecting portion 36 of the locking mechanism so as not to rotate relatively, the step locking mechanism 15 is connected to the cylindrical operating body 14. It is operated in conjunction with the turning operation of.

FIG. 2 is a plan view of the speed change device 1 according to the present embodiment, and FIG. 3 is a cross-sectional view of the speed change device 1 along a central axis.

In the present embodiment, the speed change operation cable T is composed of an inner cable t1 and an antenna cable t2 inserted into the inner cable t1, and the above-mentioned outer cable t2 is screwed inside the base end of the brake bracket 8. At the same time, the inner cable t 1 is wound around a cable winding reel 16 provided on the upper surface of the base end of the brake bracket 8.

As shown in FIGS. 4 and 5, the cable take-up reel 16 has a substantially circular trapezoidal shape, and is rotatably supported by a spindle 23 formed on the upper surface of the brake bracket 8. ing. In FIG. 4, a member denoted by reference numeral 8a is a cover that covers the above-described cable winding reel.

A first reel section 24 around which the inner cable t1 of the speed change operation cable T is looped and a drive reel section of the tubular operation body 14 are provided around the outer periphery of the cable take-up reel 16. A second reel part 25 for looping a drive cable K extending from 19 is provided.

The first reel portion 2 is provided on the reduced diameter side of the cable winding reel 16, and has a cable winding groove 2 formed by cutting the truncated conical slope in the circumferential direction. 4a, and a nipple engaging hole 27 continuously formed in the tangential direction of the cable winding groove 24a. Then, the inner cable t1 of the speed change operation cable T is wound around the above cable winding groove 24a, and the nipple 26 provided at the end thereof is inserted into the above-mentioned two nipple locking hole 27. I have been stopped.

The second reel portion 25 is provided on the enlarged diameter side along the upper surface of the brake bracket 8 of the cable take-up reel 16, and substantially has a maximum outer diameter of the cable take-up reel 16. Is formed along the cable winding groove 25a. The end of the cable winding groove 25a is curved inward in the radial direction, and the nipple locking hole 30 is formed so as to be continuous with the end of the cable winding groove 25a. Formation Have been.

The nipple 29 a provided at the end of the drive cable K wound around the cable winding groove 25 a of the second reel part 25 25 A force is inserted into the nipple locking hole 30. One end of the drive cable K is connected to the cable take-up reel 16.

The speed change operation cable T is routed along the handlebar 3, and the inner cable t1 is extended from the fastening bolt 22 in a direction substantially parallel to the handlebar. It is looped around the first reel part 24. On the other hand, the drive reel or the drive reel portion 19 of the tubular operating body 14 is extended in a direction orthogonal to the handlebar 3 and the second reel portion 2 of the cable take-up reel 16. Multiplied by five.

Since the speed change operation cable T and the drive cable K are configured to be pulled or extended in a direction substantially perpendicular to each other, the tubular operation body 1 that is fitted over the handlebar 13 with the drive cable K By winding and towing in the outer circumferential direction of 4, the speed change operation cable t1 can be towed in the direction along the handlebar 3.

Further, the nipple 29 b provided at the end of the drive cable K looped around the second reel part 25 is a reel wound around the drive reel part 19 of the tubular operating body 14. The other end of the drive cable K is fixed to the cylindrical operation body 14 by being housed in the nipple engagement hole 31 provided along the take-out groove 19a.

As shown in FIGS. 4 and 5, in the present embodiment, when the cylindrical operation body 14 is rotated so that the upper surface thereof moves backward (in the direction of arrow P), the drive cable K becomes It is wound around the drive reel portion 19 of the tubular operation body and is towed. As a result, the cable take-up reel 16 is rotated clockwise in FIG. 5, and the rotation of the cable take-up reel 16 causes the gear cable t 1 to be rotated. Is towed.

On the other hand, when the cylindrical operation body 14 is rotated so that the upper surface thereof moves forward (in the direction of arrow Q), the drive cable K is paid out from the drive reel portion 19. And an inner cable provided by a return spring (not shown) on the transmission side. The cable take-up reel 16 is rotated in the counterclockwise direction by the tension of t1, and the inner cable t1 is operated from the first reel portion 24 of the cable take-up reel 16. .

By the pulling or loosening operation of the inner cable t1, relative movement in the axial direction is given to the inner cable t1 and the outer cable t2 of the speed change operation cable, and the front transmission 1b is operated.

In the present embodiment, as described above, the first reel portion 24 that wraps around the cable take-up reel 16 around the inner cable t1 of the speed-change operation cable T, and the drive cable K A second reel part 25 for looping is provided, and as shown schematically in FIG. 6, the cable winding radius D! Of the first reel part 24 is set to the cable of the second reel 125. It is set to be smaller than the winding radius D _2.

Accordingly, as shown in FIG. 6, the traction force of the drive cable frame K wound around the second reel portion 25 is amplified to change the speed change operation cable t I wound around the first linole portion 24. Can be towed.

For this reason, the turning operation force of the tubular operating body 14 necessary for the speed change operation is greatly reduced, and the speed change operability is remarkably improved.

Since the cable winding radius of the first reel section 24 is set smaller than the cable winding radius D2 of the _second reel section 25, the driving reel For the length of the drive cable K wound around the part 19, the first reel part

The length of the speed change operation cable t1 wound around 24 becomes shorter.

Therefore, the towing amount of the inner cable t1 can be set to be smaller than the turning operation amount of the cylindrical operation body 14. For this reason, even when the number of gears is large, it is possible to set a large rotation angle for rotating the tubular operating body 14 to the adjacent gear.

A step locking mechanism 15 for locking the rotation of the cylindrical operating body 14 stepwise is provided on the inner peripheral portion of the cylindrical mounting section 10 inside the cylindrical operating body 14 in the vehicle width direction. Are provided. A so-called click mechanism is used as the step locking mechanism 15 according to this embodiment.

32 are being explored.

The click mechanism 32 is provided inside the cylindrical operation body 14 in the axial direction. A click ring 33 serving as a locking body that is integrally rotated with the operation body 14, an engagement body 34 elastically brought into contact with the outer periphery of the click ring 33, and the engagement body 3 4 It is roughly configured with a coil panel 35 for elasticity.

The click ring 33 has a substantially cylindrical shape as shown in FIGS. 7 and 8, and is rotatably fitted on the sleeve 17 at the inner peripheral portion of the cylindrical mounting portion 10. Have been.

At the outer end in the axial direction of the click ring 33, a connecting portion 36 connected to the connecting portion 20 formed at the inner end of the tubular operating body 14 is formed. As shown in FIG. 7, the plurality of engaging teeth 36a formed on the connecting portion 36 are engaged with the plurality of engaging teeth 20a formed on the connecting portion 20. The click ring 33 and the cylindrical operation body 14 are configured to rotate integrally.

As shown in FIGS. 7 and 8, a plurality of engaging recesses 37 a, 37 b... Extending in the axial direction are formed on the outer peripheral portion of the click ring 33. 4 are resiliently and sequentially engaged with the engagement recesses 37a, 37b,..., So that the cylindrical operating body 14 is gradually engaged at a predetermined rotation position. It is configured to be stopped. The click ring 33 according to the present embodiment is formed so as to correspond to a front gear having three sprockets.

The click ring 33 according to the present embodiment is configured to correspond to the front gear having three sprockets, and the engagement recesses 37 d, 37 e, and 37 f corresponding to the large-diameter sprocket. An engagement recess 37 b corresponding to the intermediate diameter sprocket and an engagement recess 37 a corresponding to the small diameter sprocket are provided. The reason why the three engagement recesses corresponding to the large diameter sprocket were formed in succession was that when the gearshift operation cable extended and the index adjustment was incorrect, the occupant could trace a small amount of the cylindrical operation body 14. This is to make it easy to make adjustments by turning.

As shown in FIG. 7, the engagement body 34 can be accommodated together with the coil panel 35 in an accommodation hole 39 provided at a base end of the brake bracket 8.

The accommodation hole 39 has an opening 40 communicating with the inner periphery of the cylindrical mounting portion 10 of the brake bracket 8, and the claw portion 38 of the engaging body 34 is cylindrically mounted from the opening 40. Protrude inside the part 10 and abut the outer periphery of the click ring 33 It is configured so that:

When the click ring 33 is rotated by rotating the tubular operation body 14, the claw portion 38 of the engagement body 34 is engaged with the engagement recess 37 of the click ring 33. a, 37 b... are sequentially engaged, and the click ring 33 or the cylindrical operating body 14 is stepwise locked at a predetermined rotation position with respect to the gripper 3. In the click mechanism 32 according to the present embodiment, the click ring 33 having the engagement recesses 37a, 37b- is formed separately from the cylindrical operation body 14, and the click ring 3 is formed. 3 is configured to be rotatably fitted to the inside of the cylindrical operation body 14 so as to rotate integrally with the cylindrical operation body 14.

Therefore, even if the cylindrical operation body 14 is distorted due to the rotation operation, the click ring 33 is not distorted by the cylindrical operation body 14. Therefore, the engagement recesses 37a, 37b, ... of the click ring 33 are not deformed, and a reliable locking function can be exhibited. As a result, the cylindrical operating body can be securely locked and held at the predetermined rotation position, and no trouble occurs in the speed change operation.

Further, in the present embodiment, at a predetermined rotation position of the click ring 33 for positioning the chain guide immediately below the intermediate gear, the bottom of the engagement recess 37 b with which the engagement body 34 engages. A cushioning member 42 made of rubber is provided.

The cushioning member 42 is embedded in a mounting groove 43 formed in the axial direction at the bottom of the engagement recess 37 b of the click ring 33, and a part thereof is partially engaged with the engagement recess 3. It is provided to be exposed from the bottom of 7b.

Further, as shown in FIG. 9, the cushioning member 42 is provided so as to be deviated to the right side from the center of the engagement concave portion 37b.

Further, in the present embodiment, an engaging recess 37 c that can hold the chain guide at the overshift position is provided adjacent to the engaging recess 37 b corresponding to the intermediate diameter sprocket of the click ring 33. Have been. The engagement recesses 37c are provided on the side where the buffer member 42 is deviated and on the opposite side.

Hereinafter, the operation of the click mechanism 32 according to the present invention will be described in detail with reference to FIG. In FIG. 9, the click ring 33 is stationary, and the Are drawn to move, but in reality, the engagement body 34 is stationary, and the click ring 33 is rotated.

Consider a case where the engaging body 34 moves in the X direction from the position drawn by the solid line, that is, a case where the chain is changed from a small diameter sprocket to an intermediate diameter sprocket. The claw portion 38 of the engagement body 34 is relatively slid on the outer peripheral portion of the click ring 33, and engages with the engagement recess 37b. A rubber cushioning member 42 is provided at the bottom of the engagement recess 37 b so as to be deviated rightward from the center of the engagement recess 37. For this reason, the claw portion 38 engaged with the engagement concave portion 37 b engages with the engagement concave portion 37 so as to ride on the exposed portion 45 of the cushioning member 42. Therefore, when the claw portion 38 slides relatively in the direction of arrow X in FIG. 9 and engages with the engagement recess 37 b, the claw portion 38 directly contacts the bottom surface of the click ring 33. Never. Accordingly, in this case, no engagement sound is generated when the claw portion 38 engages with the engagement concave portion 37b, or the engagement noise is extremely small.

As shown in FIGS. 8 and 9, on the left side of the engaging recess 37 b, an engaging recess 37 c for holding the click ring 33 at the overshift position is provided adjacent thereto. ing. Therefore, when the cylindrical operation body is further rotated to engage the claw portion 38 with the engagement concave portion 37c, an engagement sound is generated. This allows the occupant to recognize that the tubular operating body 14 has been rotated to the shift operation position, and locks the tubular operating body at the overshift position.

As a result, at this overshift position, the chain is smoothly switched from the small-diameter sprocket to the intermediate-diameter sprocket, and the speed change is performed smoothly. Also, if the chain touches the chain guide due to the above-mentioned overshift and a chain noise is generated, the occupant returns the tubular operating body to rotate, and the engaging body 34 is moved to the proper engagement position. What is necessary is just to engage with the concave part 37b.

When the click ring 33 is rotated back from the overshift position, the claw 38 of the engagement body 34 is moved relative to the click ring 33 in the Y direction as shown in FIG. Then, the engagement concave portion 37c is reengaged from the engagement concave portion 37c.

The engaging recess 37 b has a circumferential width set to be larger than the width of the claw 38. In addition, the buffer member 42 is provided so as to be deviated from the center to the side opposite to the engagement recess 37 c corresponding to the overshift position. Therefore, when the claw portion 38 is engaged with the engagement recess 37 b from the engagement recess 37 c side, the claw 38 engages the cushioning member 42 of the engagement recess 37 b. It comes into contact with the portion 44 that is not provided, and at this time, an engagement sound is generated. Therefore, the occupant can recognize that the tubular operating body has been positioned at the regular transfer position. Therefore, the return rotation of the tubular operation body 14 can be reliably performed.

Further, in the present embodiment, as shown in FIGS. 8 and 9, the left slope of the engagement concave portion 37c corresponding to the overshift position is formed in a gentle taper shape. For this reason, when the claw portion 38 engages with the engagement recess 37c from the engagement recess 37d corresponding to the large diameter sprocket, that is, the engagement body 34 moves in the Y direction in FIG. No engagement sound is generated when engaging with the engagement recess 37c.

In the above configuration, when changing the chain from the small-diameter sprocket to the intermediate-diameter sprocket, the occupant must use the cylindrical operating body 14 in which the engaging recess 37 b and the engaging body 34 engage. Attempts to rotate the speed change operation body 14 beyond the predetermined rotation position, or to maintain the force applied to the variable operation body 14 as it is. Therefore, the chain guide can be reliably moved to a position beyond the position directly below the large diameter sprocket, that is, to the overshift position, and held.

On the other hand, when changing the chain from the large diameter sprocket to the intermediate diameter sprocket, the chain guide is reliably guided to a position directly below the intermediate diameter sprocket, and an engagement sound can be generated at this time.

As described above, the click mechanism 32 according to the present invention can prevent or suppress the generation of unnecessary engagement noise, and can also rotate the cylindrical operation body 14 at a predetermined gear position. In this case, the engagement sound can be reliably generated. Therefore, there is no engagement sound that may be mistaken for the completion of the speed change operation, and it is possible to prevent a passenger from interrupting the speed change operation due to the engagement sound and to perform a reliable speed change operation. It becomes possible.

10 and 11 show a second embodiment according to the present invention.

In this embodiment, the lever shaft protruding from the appropriate portion of the bicycle frame The present invention is applied to a conventional speed change operation device configured by rotatably fitting a lever body having an extending arm portion.

In this embodiment, a disc-shaped click plate 33a having a center hole is employed as a locking body while a steel ball 34a force is employed as an engaging body. The click plate 33 a according to the present embodiment includes an engagement plate 50 having engagement holes 50 a, 50 Ob... Arranged at predetermined intervals in a circumferential direction; The base plate 52 attached to the opposite side of the ball 34a from the base plate 52, and the rubber plate 5 interposed between the engagement plate 50 and the base plate 52 1 and are configured. The rubber plate 51 constitutes the bottom of each engagement recess 53 with which the steel ball 34a engages in a state where the rubber plate 51 is backed up by the base plate 52.

Ear pieces 54a and 54b to be engaged with the inner circumference of the boss base (not shown) of the lever body are provided on the outer circumference of the engagement plate 50 and the base plate 52, respectively. The entire click plate is made to rotate with the lever body. On the other hand, the steel ball 34 a is held movably in the holding hole 55 a of the engaging body holding plate 55 fitted into the lever shaft so that it cannot rotate relative to the lever shaft. 6 is configured to elastically contact the click plate 33a.

When the lever body is rotated, the steel balls 34a are sequentially elastically engaged with the engagement recesses 53 formed by the engagement holes 50a, 50b... And the base plate 52. In this case, the lever body is locked stepwise at a predetermined rotation position.

In the present embodiment, as shown in FIG. 11, each of the engaging recesses 53 is formed by the engaging holes 50 a, 5 Ob,. A rubber plate 51 is arranged on the entire bottom surface of 3. For this reason, the steel ball 34 a engaging with the engagement recess 53 does not directly collide with the surface of the base plate 52, and the steel ball 34 a and the click plate 33 associated with the gear shifting operation are not provided. The generation of the engagement noise of a can be prevented or the magnitude of the engagement noise can be reduced. Therefore, the same effects as in the first embodiment can be exerted.

In the embodiment, the bottom of all the engagement recesses 53 is provided with a rubber as a cushioning member. Although the rubber plate 51 is arranged, a part of the rubber plate 51 is cut out, so that the rubber plate 52 is arranged at the bottom of a predetermined engagement concave portion to selectively generate an engagement sound. It can also be prevented.

The scope of the present invention is not limited to the above embodiments.

In the embodiment, the present invention is applied to the right IJ operating device 6b for operating the front transmission, but may be applied to the left speed operating device 6a for operating the rear transmission 1a. .

Further, the number of steps in the step locking mechanism 15 is not limited to the embodiment, and the present invention can be applied to a multi-stage gear having two or four or more sub-rockets.

Further, in the embodiment, the rubber cushioning member is provided, but the magnitude or sound quality of the engagement sound can be adjusted by searching for a resin cushioning member. Further, in the first embodiment, the overshift function is provided at the rotation position of the cylindrical operating body corresponding to the intermediate diameter sprocket, but when the intermediate diameter sprocket is switched to the large diameter sprocket, It can also be configured to exert an overshift function. .

Claims

The scope of the claims

(1) a speed-change operating body rotatably supported by a suitable portion of the bicycle frame; and a step locking mechanism for phase-locking the speed-change operation body at a predetermined rotation position. A bicycle shift operating device configured to pull or unwind a shift operating cable by performing a moving operation,

The step locking mechanism includes: a locking body having a plurality of engagement recesses; and an engagement body that is sequentially and elastically engaged with the engagement recesses in accordance with a rotation operation of the speed change operation body. A shift operation device for a bicycle, comprising: a buffer member that prevents or suppresses generation of an engagement sound when the engagement body engages with the engagement recess in a predetermined engagement recess of the locking body.

(2) The speed change operating device for a bicycle according to claim 1, wherein a buffer member is provided in a part or the entirety of the engaging recess.

(3) The cushioning member is provided so as to be deviated so as to prevent or suppress generation of an engagement sound when the engagement body engages with the engagement recess from one direction. 1 gear shifting device for bicycles.

(4) When the chain is changed from a small diameter sprocket to a medium diameter sprocket by pulling the speed change operation cable, engagement is performed at the normal rotational operation position of the speed change operation body corresponding to the medium diameter sprocket of the speed change operation body. While preventing the generation of sound, the engagement sound is generated at an overshift position set at a position beyond the normal rotation operation position,

When changing the chain from a large-diameter sprocket to a medium-diameter sprocket by extending the speed change operation cable, it is possible to prevent the generation of engagement noise at the overshift position and to set the normal rotation operation position and the normal rotation position of the speed change operation body. The speed change operating device for a bicycle according to claim 3, wherein the speed change operating device is configured to generate an engagement sound.

(5) The speed change operation body has a cylindrical shape, and is rotatably fitted on the outer peripheral portion of the handlebar while being supported.

The locking body in the step locking mechanism has a ring shape, is rotatably fitted to the outer periphery of the handlebar, and is rotated integrally with the speed change operation body. The speed change operating device for a bicycle according to claim 1, wherein

(6) The above-mentioned speed change operation body is provided with a boss-shaped base rotatably fitted on a lever shaft protruding from an appropriate portion of the bicycle frame, and extends radially outward from an outer peripheral portion of the boss-shaped base. While having an arm part,

3. The bicycle shift operating device according to claim 1, wherein the locking body has a disk shape having a shaft hole that is fitted into the lever shaft.