JP2606243Y2 - Rear derailleur for bicycle - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a chain guide having a guide pulley and a tension pulley for a chain, a support for supporting the chain guide, a support and a bracket connected to a vehicle body frame. A rear derailleur for a bicycle, comprising a pair of swinging link bodies to be connected, and a rotation support shaft of the chain guide rotatably inserted into an assembling hole of the support body. For means for.

[0002]

2. Description of the Related Art In the above rear derailleur, as shown in, for example, JP-A-63-240489, a retaining pin inserted into a support in a direction intersecting with a rotation support shaft of a chain guide is conventionally used. By preventing the rotation shaft from coming off by acting as a stopper on the locking part of the rotation shaft,
There has been a means in which the chain guide can be prevented from coming off by a relatively simple structure in which the retaining pin is simply inserted into the support.

[0003]

Conventionally, a change in tension or vibration occurs in the chain at the time of shifting or running, causing the chain guide to rotate with respect to the support. Since the rotation support shaft also rotates with respect to the support, friction occurs between the rotation support shaft and the retaining pin,
The retaining pin was relatively easily worn out earlier. Also, depending on the degree of friction between the rotating shaft and the retaining pin,
In some cases, the rotation shaft is difficult to rotate due to frictional resistance, and the guide pulley and the tension pulley are difficult to operate smoothly. SUMMARY OF THE INVENTION An object of the present invention is to provide a bicycle rear derailleur in which the chain guide can be easily prevented from coming off, and the wear-out trouble or the malfunction can be easily avoided.

[0004]

In order to achieve the object, in the bicycle rear derailleur according to the first invention, the retaining pin for the rotating shaft described in the opening paragraph is replaced with the retaining pin. The axis of (13) is a rotating spindle
(12) The stopper is inserted into the support in a direction perpendicular or substantially perpendicular to the axis of the shaft, and the stopper of the retaining pin is brought into contact with the locking part of the rotation support shaft. The rotation support shaft is configured to be prevented from falling out of the support, and the stopper portion is attached to the stopper pin.
Direction perpendicular or almost perpendicular to the axis of the rotation support shaft
Are formed by a roller rotatably mounted around the axis . In the rear derailleur for a bicycle according to the second invention, in order to achieve the object, in the one described at the beginning, the retaining pin for the rotation support shaft is provided on the support in a direction intersecting the rotation support shaft. Inserting, the stopper portion of the retaining pin is configured to prevent the rotation shaft from falling out of the support by the contact action of the stopper portion of the rotation shaft,
The stopper portion has a lower friction coefficient than a portion of the retaining pin other than the stopper portion. In the rear derailleur for a bicycle according to the third invention, in order to achieve the object, in the one described at the beginning, the retaining pin for the rotation support shaft is provided on the support in a direction intersecting the rotation support shaft. Inserting, the stopper portion of the retaining pin is configured to prevent the rotation shaft from falling out of the support body by contacting the stopper portion of the rotation shaft with the locking portion of the rotation shaft. The retaining pin has a higher abrasion resistance than a portion other than the stopper portion.

[0005]

In any of the first to third inventions, by inserting the retaining pin into the support in the above-mentioned direction, the retaining pin acts on the rotating shaft by the stopper portion, and the chain guide comes off. Stopping is possible. Even in the case of the first invention, even if the retaining pin comes into contact with the rotating rotation shaft, the stopper portion which contacts comes into rotation and the friction is not as strong as in the past, and in the case of the second invention, The sliding contact is smoother than before because of the low friction coefficient of the contacting stopper portion. In the case of the third invention, the contacting stopper portion is hardly worn due to high abrasion resistance in spite of friction.

[0006]

According to the first to third inventions, the chain guide can be prevented from coming off with a relatively simple structure in which the retaining pin is simply inserted into the support in the above-mentioned direction. Because the parts slide smoothly or the stopper parts are not easily worn away, the chain guide can be assembled with high accuracy and reliability, and can be manufactured at a relatively low cost with a reliable one that works well over a long period of time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a bracket body 1 is connected to a rear fork end portion FE of a vehicle body frame F so as to be rotatable about a first axis B parallel or substantially parallel to a rear wheel hub axis. , A shift wire W from a shift operating device (not shown)
By mounting the outer wire on the outer receiving member 2 of the bracket body 1 and the inner wire WI on the inner connecting tool 4 of the swing link body 3a, and operating the inner wire WI by the speed change device. The bicycle rear derailleur is configured such that the guide pulley 5 and the tension pulley 6 move in the lateral direction of the vehicle body with respect to the bracket body 1 and exchange the chain C with the rear wheel drive gears G1 to G7. That is, the guide pulley 5 and the tension pulley 6 are attached to a chain guide 7, and the chain guide 7 is rotatable about a second axis P parallel or substantially parallel to the first axis B on the support 8. It is attached to. The support 8 is connected to the bracket body 1 by two swing links of the swing link 3a, and the swing link 3a and the swing link 3b arranged side by side in the vehicle body. The bracket body 1, the swing link bodies 3a, 3b, and the support body 8 constitute a quadruple link mechanism, so that when the inner wire WI is pulled, the inner wire WI has a pulling force. The support 8 moves toward the inside of the vehicle body with respect to the bracket 1, and the guide pulley 5 and the tension pulley 6 move and guide the chain C in the same direction to change the gears G1 to G7 from the small diameter side to the large diameter side. Manipulate. When the loosening operation of the inner wire WI is performed, the swing link 3
The support 8 moves to the outside of the vehicle body with respect to the bracket body 1 due to the operation force by the elastic restoring force of the return spring 9 acting on the a and 3b, and the guide pulley 5 and the tension pulley 6 move the chain C in the same direction. To the gear G1
G7 is switched from the large diameter side to the small diameter side. A first tension spring 10 housed in the bracket body 1 urges the bracket body 1 to swing around the first shaft center B with respect to the vehicle body frame F, and the chain C through the guide pulley 5 and the tension pulley 6. As shown in FIG. 2, a second tension spring 11 provided inside the support 8 swings the chain guide 7 around the second axis P with respect to the support 8 as shown in FIG. By urging the chain C via the guide pulley 5 and the tension pulley 6 to apply tension to the chain C, a tension state suitable for driving the rear wheels is obtained regardless of whether the chain C is engaged with any of the gears G1 to G7.

The attachment of the chain guide 7 to the support 8 is performed by an attachment structure shown in FIG. That is, the rotation support shaft 12, which is configured to rotate with respect to the support 8 together with the chain guide 7 by being fixed to the chain guide 7, is attached to the mounting hole 8 a formed in the support 8 by the second shaft center. It is inserted so as to rotate around the axis of the rotation support shaft 12 as P. As shown in FIG. 3, the stopper 13 a on the distal end side of the retaining pin 13, which is a screw screwed to the support 8 in a direction orthogonal or substantially orthogonal to the second axis P, is formed into an annular recess of the rotation support shaft 12. The rotation support shaft 12 is inserted into the insertion portion 12a, and the rotation support shaft 12 is brought into contact with a locking portion 12b, which is a distal end portion forming the annular concave portion 12a, so as to prevent the rotation support shaft 12 from coming out of the support body 8. With this configuration, the chain guide 7 is prevented from coming off. By forming the stopper portion 13a of the retaining pin 13 as shown in FIG. 4, FIG. 5, or FIG. 6, the rotation support shaft 12 rotates smoothly when the chain guide 7 rotates, or the stopper portion 13a Is the rotating shaft 12
Care has been taken to ensure that it is hard to wear regardless of friction.
That is, in the retaining pin 13 shown in FIG. That is, the stopper 13a
Even when it comes into contact with the engaging portion 12b of the rotating support shaft 12, it comes into contact while rotating, so that the friction between the stopper portion 13a and the support shaft 12 is relatively low.

In the retaining pin 13 shown in FIG.
The stopper pin body 13b is formed of an iron screw, and the stopper portion 13a is formed of a fluororesin ring externally fitted to the tip of the stopper pin body 13a. 13a
It has a lower coefficient of friction than the portion 13b except for. That is, the locking portion 1 of the support shaft 12 on which the stopper portion 13a rotates.
Even if it comes into contact with 2b, the two slide smoothly due to the low friction coefficient of the stopper portion 13a.

In the retaining pin 13 shown in FIG.
The stopper pin body 13b is formed of an iron screw, and the stopper 13a is formed of a ceramic ring externally fitted to the tip of the stopper pin body 13a, so that the stopper 13a of the stopper pin 13 is formed on the stopper 13a.
The abrasion resistance is higher than that of the portion 13b excluding a. In other words, even when the stopper 13a contacts the locking portion 12b of the pivot 12 to be rotated, the stopper 13a is relatively less likely to wear due to the high wear resistance of the stopper 13a.

In attaching the retaining pin 13 to the support 8, the retaining pin 13 is arranged so as to be orthogonal or substantially orthogonal to the rotation axis P of the rotation support shaft 12, and the retention pin 13 is also connected to the rotation support shaft 12. The stopper portion 13a may be disposed so as to be engaged with the rotation support shaft 12 from the lateral direction and to contact the locking portion 12b without being orthogonal to the rotation axis P. In other words, when the stopper 13a is formed by a roller, the axis of the retaining pin 13 is orthogonal to the rotation axis P if the stopper 13a rotates when the stopper 13a and the latch 12a come into contact with each other. You don't have to. When the stopper portion 13a is formed so as not to rotate with respect to the retaining pin main body 13b as shown in FIGS. 5 and 6, the stopper portion 13a may be arranged as shown in FIG. In short, the retaining pin 13 is connected to the rotation support shaft 1 such that the stopper 13a acts as a stopper on the locking portion 12b of the rotation support shaft 12.
It is good to attach so that it may cross 2. In the case of mounting with the arrangement shown in FIG.
a is equal to the depth of the annular recess 12a in the case of mounting in the arrangement of FIG.
The contact length L1 in the axial direction of the retaining pin when the shaft comes into contact with the rotary support shaft 12 can be longer than the contact length L2 in the arrangement shown in FIG. In other words, the area where the retaining pin 13 acts as a stopper on the locking portion 12b of the rotation support shaft 12 becomes relatively large, and the effect of preventing the rotation support shaft 12 from being removed is large.

[Other Embodiments] The retaining pin may be implemented by using a driving pin instead of a screw. When lowering the friction coefficient of the stopper part of the retaining pin compared to the pin part other than the stopper part, and making the wear resistance of the stopper part of the retaining pin higher than the pin part other than the stopper part, the stopper part of the retaining pin It is also possible to employ a means for coating a resin or the like having a low friction coefficient or a high abrasion resistance on a portion where the stopper is to be formed, or a means for performing a heat treatment such as induction hardening of the stopper forming portion.

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a side view of a bicycle rear derailleur in use.

FIG. 2 is a sectional view of a chain guide mounting portion.

FIG. 3 is a sectional view taken along the line III-III in FIG. 3;

FIG. 4 is a front view of the entire retaining pin.

FIG. 5 is a front view of the entire retaining pin according to another embodiment.

FIG. 6 is a front view of the entire retaining pin according to another embodiment.

FIG. 7 is a cross-sectional view showing another mounting structure of the retaining pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket body 3a, 3b Oscillating link body 5 Guide pulley 6 Tension pulley 7 Chain guide 8 Support body 8a Assembling hole 12 Support shaft 12b Locking portion 13 Retaining pin 13a Stopper portion 13b Retaining pin portion F Body frame P Rotating shaft core

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-240489 (JP, A) JP-A-61-4677 (JP, A) Fully open 1984-195213 (JP, U) Really open 107392 (JP, U) Japanese Utility Model Showa 62-130208 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62M 9/12

Claims (3)

(57) [Scope of request for utility model registration] 1. A chain guide (7) having a guide pulley (5) and a tension pulley (6) for a chain, a support (8) for supporting the chain guide (7), and the support (8). And a pair of swing links (3a) and (3b) connecting the bracket body (1) connected to the vehicle body frame (F), and a rotation shaft (12) of the chain guide (7). A bicycle rear derailleur rotatably inserted into an assembling hole (8a) of the support (8), wherein a retaining pin (13) for the rotary support shaft (12) is provided.
The axis of the retaining pin (13) is
Said support in an orthogonal or nearly orthogonal direction to the axis of 2) (8) to insert the city, the locking of the stopper portion of the stopper pin (13) (13a) said rotary shaft (12) The stopper (13a) is configured to prevent the rotation support shaft (12) from falling out of the support (8) by contacting the stopper (12b).
3) At right angles or approximately perpendicular to the axis of the rotary support shaft (12).
A rear derailleur for bicycles formed by rollers rotatably mounted around an axis in a direction substantially perpendicular to the bicycle. 2. A chain guide (7) having a guide pulley (5) and a tension pulley (6) for a chain, a support (8) for supporting the chain guide (7), and the support (8). And a pair of swing links (3a) and (3b) connecting the bracket body (1) connected to the vehicle body frame (F), and a rotation shaft (12) of the chain guide (7). A bicycle rear derailleur rotatably inserted into an assembling hole (8a) of the support (8), wherein a retaining pin (13) for the rotary support shaft (12) is provided.
Is inserted into the support body (8) in a direction intersecting with the rotation support shaft (12), and the stopper portion (13a) of the retaining pin (13) is engaged with the locking portion of the rotation support shaft (12). The stopper pin (1a) is provided on the stopper portion (13a) by preventing the rotation support shaft (12) from falling out of the support body (8) by contacting the rotation support shaft (12b).
3) The part (13) excluding the stopper part (13a)
b) A bicycle re-delaira with a lower coefficient of friction. 3. A chain guide (7) to which a guide pulley (5) and a tension pulley (6) for a chain are attached, a support (8) for supporting the chain guide (7), and the support (8). And a pair of swing links (3a) and (3b) connecting the bracket body (1) connected to the vehicle body frame (F), and a rotation shaft (12) of the chain guide (7). A bicycle rear derailleur rotatably inserted into an assembling hole (8a) of the support (8), wherein a retaining pin (13) for the rotary support shaft (12) is provided.
Is inserted into the support body (8) in a direction intersecting with the rotation support shaft (12), and the stopper portion (13a) of the retaining pin (13) is engaged with the locking portion of the rotation support shaft (12). The stopper pin (1a) is provided on the stopper portion (13a) by preventing the rotation support shaft (12) from falling out of the support body (8) by contacting the rotation support shaft (12b).
3) A rear derailleur for a bicycle having higher wear resistance than the portion excluding the stopper portion (13a) of 3).