CN220555375U - Bicycle rear derailleur - Google Patents

Abstract

The utility model discloses a bicycle rear derailleur, comprising a base member, a connecting member, a movable member and a chain guide member, the movable member comprising: a P joint member; a main shaft on which a first contact part is arranged in a ring manner; the resistance applying unit comprises a unidirectional transmission unit and a shaft sleeve, the unidirectional transmission unit is fixed in the P joint component, the shaft sleeve is sleeved on the main shaft, a second contact part which is in contact with the first contact part is arranged in a ring manner, the unidirectional transmission unit locks the shaft sleeve in the chain loosening direction and releases the shaft sleeve in the chain tensioning direction; the resistance adjusting unit comprises a linear adjusting component and a reset elastic piece, wherein the linear adjusting component is used for adjusting the expansion and contraction amount of the reset elastic piece, and the reset force of the reset elastic piece is used for adjusting the resistance between the first contact part and the second contact part. The present utility model applies resistance to the chain guide member in the chain loosening direction by the resistance applying unit, avoids chain loosening, and can adjust the applied resistance.

Description

Bicycle rear derailleur

Technical Field

The utility model relates to the technical field of bicycle speed changing devices, in particular to a bicycle rear derailleur.

Background

At present, a rear derailleur, for short, is an important component part of a speed change system on a variable speed bicycle such as a mountain bike, a road bike and the like, and is responsible for the change of a chain on different flywheel sheets so as to cope with different road conditions and enable a rider to more reasonably utilize a body to drive the bicycle to advance.

The primary function of the rear derailleur is to selectively shift the bicycle chain of the drive system among a series of cogwheels of different diameters attached to the rear wheel. The switching of the bicycle chain from one cog wheel to another cog wheel at the rear wheel is done in order to change the transmission ratio of the transmission system. The second function of the rear derailleur is to apply tension to the chain in the chain on the non-drive side of the drive train to take up slack and to maintain the desired tension.

However, during riding, such as traveling over rough terrain or rough terrain, the inertia of the jolts and vibrations may cause the chain guide member to undesirably rotate in the chain loosening direction to overcome the biasing force applied to the chain guide member, thereby causing the chain to loosen, causing the chain to fall off, resulting in poor practicality of the rear derailleur.

The solution to this undesirable situation is to integrate a one-way damping system into the chain tensioning portion of the rear derailleur, the one-way damping system being designed to resist rotation of the chain guide member, particularly in the chain loosening direction, the one-way damping system being configured to resist rotation of the chain guide member in the chain loosening direction while still allowing the chain guide member to freely rotate in the chain tensioning direction.

In the prior art, similar damping systems exist, some of the damping systems are provided with a switch or a switching mode, and the intervention of the damping systems is controlled by opening and closing the switch or the switching mode, but the damping size cannot be adjusted by the scheme, and different resistance requirements of users under various conditions cannot be met.

Disclosure of Invention

In order to solve the above-mentioned technical problems, the present utility model provides a bicycle rear derailleur, which applies a resistance to a pivotal movement of a chain guide member in a chain loosening direction by a resistance applying unit, avoids chain loosening, and satisfies various different damping amount demands of users by adjusting the amount of resistance applied between a first contact portion and a second contact portion.

In order to achieve the aim of the utility model, the utility model is realized by adopting the following technical scheme:

the present application relates to a bicycle rear derailleur, including base member, connecting element, movable member and chain guide member, the base member is suitable for on the installation bicycle, the connecting element rotates to set up between base member and the movable member, the movable member rotate set up in on the chain guide member, the movable member includes:

a P joint member rotatably connected to the connecting member and the chain guide member, respectively;

the main shaft penetrates through the P joint component and is fixedly connected with the chain guide component, and a first contact part is arranged on the main shaft in a surrounding mode;

a resistance force applying unit including a one-way transmission unit fixed in the P joint member, and a sleeve sleeved on the main shaft and having an inner ring provided with a second contact portion contacting the first contact portion, the one-way transmission unit locking the sleeve in a chain loosening direction so as to generate resistance force between the first contact portion and the second contact portion, and releasing the sleeve in a chain tensioning direction so as not to generate resistance force between the first contact portion and the second contact portion;

the resistance adjusting unit comprises a linear adjusting component and a reset elastic piece, wherein the linear adjusting component is used for adjusting the expansion and contraction amount of the reset elastic piece, and the reset force of the reset elastic piece is used for adjusting the resistance between the first contact portion and the second contact portion.

In some embodiments of the present application, the contact portion of the first contact portion is designed to be inclined with respect to the axis as a first inclined surface, and the contact portion of the second contact portion is designed to be a second inclined surface matching the inclination of the first inclined surface.

In some embodiments of the present application, the unidirectional transmission unit is a unidirectional bearing fixed within the P-joint member, the sleeve being disposed within the unidirectional bearing and having the inner cavity.

In some embodiments herein, the lumen comprises a first lumen and a second lumen separated by an intermediate portion, the intermediate portion being formed with a through portion that communicates the first lumen and the second lumen;

the main shaft wears to establish in proper order first inner chamber and second inner chamber, first inner chamber is interior to be established and is formed the second contact portion, the elastic component that resets is located in the second inner chamber when the straight line adjusting part is adjusted the flexible volume of elastic component resets, the elastic component that resets to the intermediate part applys the restoring force.

In some embodiments herein, the linear adjustment assembly comprises:

the adjusting piece is provided with a first threaded connection part, a second threaded connection part is arranged at the free end of the main shaft in the second inner cavity, the first threaded connection part and the second threaded connection part are in threaded connection, one end of the reset elastic piece abuts against the adjusting piece, and the other end of the reset elastic piece abuts against the middle part.

In some embodiments of the present application, the adjustment member comprises a nut, the first threaded connection is an internal thread of the nut, and the second threaded connection is an external thread provided at the free end of the spindle.

In some embodiments herein, the adjuster further comprises a handpiece located outside the P-joint member;

the nut is mounted on the hand-held portion.

In some embodiments of the present application, the adjustment member is a screw, the first threaded connection is an external thread of the screw, and the second threaded connection is an internal thread provided at the free end of the spindle.

In some embodiments of the present application, a receiving cavity is formed in the P-joint member, and a torsion spring is received in the receiving cavity;

one end of the torsion spring abuts against the P joint component, and the other end of the torsion spring extends out of the accommodating cavity and abuts against the chain guide component.

In some embodiments of the present application, the spindle has a relief portion, and a pin hole is formed in the P joint member corresponding to the relief portion, and the pin shaft is inserted into the pin hole and extends into the relief portion, so as to limit the spindle to move along a direction perpendicular to the axis.

Compared with the prior art, the bicycle rear derailleur of the embodiment has the following advantages:

(1) The resistance applying unit is adopted to enable friction force to be generated between the second contact part and the first contact part in the chain loosening direction, so that the friction force resists the rotation of the chain guide member in the chain loosening direction, and basically no friction force is generated between the second contact part and the first contact part in the chain tensioning direction, so that the chain guide member freely rotates in the chain tensioning direction;

(2) Adopt resistance adjustment unit, can adjust the flexible volume of elastic component that resets through sharp adjusting part, and the effort between first contact and the second contact is adjusted to the restoring force of elastic component that resets, when making the elastic component that resets extend, the effort between first contact and the second contact diminishes, mutual damping force diminishes when making the friction between the two, the restoring force is bigger when the elastic component that resets is compressed, effort between first contact and the second contact grow, mutual damping force grow when making the friction between the two, from this, but the adjustable damping force size of the flexible volume of elastic component that resets is adjusted through sharp adjusting part.

Other features and advantages of the present utility model will become apparent upon review of the detailed description of the utility model in conjunction with the drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of a rear derailleur embodiment of a bicycle in accordance with the present utility model at a first angle;

FIG. 2 is a block diagram of a rear derailleur embodiment of a bicycle in accordance with the present utility model at a second angle;

FIG. 3 is a block diagram of a rear derailleur embodiment of a bicycle at a third angle in accordance with the present utility model;

FIG. 4 is a cross-sectional view taken along the direction C-C in FIG. 3;

FIG. 5 is an enlarged view of the box shown in phantom in FIG. 4;

FIG. 6 is a block diagram of a sleeve at a first angle in an embodiment of a bicycle rear derailleur in accordance with the present utility model;

FIG. 7 is a block diagram of a rear derailleur embodiment of a bicycle with a sleeve at a second angle in accordance with the present utility model;

FIG. 8 is an installation view of the pin and spindle assembly of the rear bicycle derailleur embodiment in accordance with the present utility model;

FIG. 9 is a block diagram of an adjustment member in a bicycle rear derailleur embodiment in accordance with the present utility model.

Reference numerals:

100. a bicycle rear derailleur; 110. a chain guide member; 111. a first link plate; 112. a second link plate; 113. a tensioning wheel; 114. a guide wheel; 120. a connecting member; 130. a P joint member; 131. a pin hole; 132. a limit column; 140. a main shaft; 141. a first inclined surface; 142. an external thread; 150. a resistance force applying unit; 151. a one-way bearing; 152. a shaft sleeve; 1521. a first lumen; 1522. a second lumen; 1523. a second inclined surface; 1524. an intermediate portion; 160. a resistance adjusting unit; 161. an adjusting member; 1611. a hand-held part; 1612. silk screen printing; 162. a spring; 170. a torsion spring; 180. a pin shaft; 190. and a rear cover.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

The bicycle includes a frame having front and rear wheels rotatably coupled thereto in a conventional manner, with the rear portion of the frame including a rear derailleur mounting plate and the rear derailleur directly attached to the rear derailleur mounting plate. Of course, many different rear derailleur mounting arrangements can be provided, such as a removable derailleur hanger.

The bicycle further includes a conventional rear derailleur control device mounted to the handlebar to control the rear derailleur via a bowden-type shift control cable that includes an inner wire slidably disposed within a cable housing.

The rider operates the rear derailleur control device to selectively pull or release the inner wire to operate the rear derailleur to move the chain laterally over a plurality of rear sprockets coupled to the rear wheel.

To avoid rotation of the chain guide member 110 in an undesired situation as described in the background, the present application relates to a bicycle rear derailleur 100 that includes a base member (not shown), a connecting member 120, a movable member and the chain guide member 110.

The base member is adapted to be mounted on a bicycle, and in particular, can be mounted on a rear derailleur mounting plate, and the connecting member 120 is connected between the base member and the movable member such that the chain guide member 110 can be moved to a plurality of shift positions corresponding to the number of rear sprockets.

The connecting member 120 pivotably connects the base member and the movable member.

It should be noted that the improvement of the movable member is mainly performed in this application, and the base member, the connecting member 120 and the chain guide member 110 all adopt the prior art solutions, which are not described in detail in this application.

Specifically, referring to fig. 1 and 2, the chain guide member 110 includes a first link plate 111, a second link plate 112, a guide wheel 114, and a tension wheel 113, wherein the guide wheel 114 is rotatably installed between the first link plate 111 and the second link plate 112 by bolting, and is located at one end of the first link plate 111 and the second link plate 112, and the tension wheel 113 is rotatably installed between the first link plate 111 and the second link plate 112 by bolting, and is located at the other end of the first link plate 111 and the second link plate 112, wherein the main shaft 140 is fixedly installed on the first link plate 111 by bolts, referring to fig. 4.

In some embodiments herein, the movable member includes a P-joint member 130, a spindle 140, a resistance force applying unit 150, and a resistance force adjusting unit 160, wherein the resistance force applying unit 150 includes a one-way transmission unit and a sleeve 152.

The P-joint member 130 is pivotally connected to the connecting member 120 and pivotally connected to the chain guide member 110 by a pivot.

Referring to fig. 4, the p joint member 130 is provided with a through cavity (not shown) therein, and the main shaft 140 is inserted into the through cavity, such that one end of the main shaft 140 is fixed to the first link plate 111 of the chain guide member 110, and the other end is a free end; the spindle 140 is provided with a first contact portion.

The unidirectional transmission unit is fixed in the P joint member 130, and specifically may be fixed in the P joint member 130 by pressing or bonding, that is, the two components do not move relatively.

The sleeve 152 is sleeved on the main shaft 140, and the inner ring is provided with a second contact portion contacted by the first contact portion.

The bushing 152 can be driven by a one-way drive unit that releases the bushing 152 when the chain guide member 110 rotates in the chain tensioning direction along with the main shaft 140 such that substantially no resistance is generated between the first contact portion and the second contact portion when the chain guide member 110 rotates in the chain tensioning direction, and therefore, the chain guide member 110 and the main shaft 140 can freely rotate in the chain tensioning direction.

And in the chain loosening direction, the one-way transmission unit locks the bushing 152 such that when the chain guide member 110 rotates in the chain loosening direction together with the main shaft 140, a resistance is generated between both the first contact portion and the second contact portion, and thus, the resistance resists rotation of the chain guide member 110 and the main shaft 140 in the chain loosening direction.

In some embodiments herein, in order to enhance the contact between the first contact portion and the second contact portion, referring to fig. 4 and 5, the contact portion of the first contact portion is designed to be inclined with respect to the axis of the main shaft 140 as a first inclined surface 141, and correspondingly, the contact portion of the second contact portion is designed to be inclined with a second inclined surface 1523 matching the first inclined surface 141.

The first contact portion may have a tapered structure annularly provided on the main shaft 140, referring to fig. 4 and 8, the tapered direction refers to a direction from an end of the main shaft 140 near the chain guide member 110 to a free end of the main shaft 140, that is, a cross-sectional area of the first contact portion in the tapered direction gradually decreases, and the first inclined surface 141 is a tapered sector of the first contact portion.

Correspondingly, the second inclined surface 1523 is a conical sector arranged around the inside of the shaft sleeve 152, and the first inclined surface 141 and the second inclined surface 1523 are matched, i.e. the first inclined surface 141 and the second inclined surface 1523 are closely attached, see fig. 4 and 5.

In some embodiments herein, the contact portion of the first contact portion may also be a first plane along a direction perpendicular to the axis of the main shaft 140, and correspondingly, the contact portion of the second contact portion is a second plane abutting against the first plane, specifically, an end plane of the bushing 152 near the chain guide member 110.

Referring to fig. 4 and 5, the one-way transmission unit may be a one-way bearing 151, the one-way bearing 151 having a one-way locking function, which is fixed into the P joint member 130, and an outer ring of the sleeve 152 is matched with an inner ring of the one-way bearing 151 such that the one-way bearing 151 locks the sleeve 152 when rotated in one direction and releases the sleeve 152 when rotated in the other direction.

Correspondingly, in some embodiments of the present application, when the chain guide member 110 rotates in the chain tensioning direction, the spindle 140 is driven to rotate in the chain tensioning direction, and since the one-way bearing 151 releases the sleeve 152 at this time, no friction is generated between the first contact portion and the second contact portion, and the spindle 140 can drive the sleeve 152 to rotate freely.

When the chain guide member 110 rotates in the chain loosening direction, the main shaft 140 is driven to rotate in the chain loosening direction, and the unidirectional bearing 151 and the shaft sleeve 152 do not rotate relative to the chain guide member 110 because the unidirectional bearing 151 locks the shaft sleeve 152 at this time, and at this time, the rotation of the main shaft 140 in the chain loosening direction generates friction between the first contact portion and the second contact portion, that is, there is a resistance force that resists the rotation of the main shaft 140 in the chain loosening direction, so that the chain guide member 110 is prevented from rotating in the chain loosening direction.

Wherein the chain tensioning direction and the chain loosening direction are opposite.

In some embodiments herein, the unidirectional transmission unit may also employ a ratchet mechanism for achieving unidirectional transmission.

To adjust the degree of resistance, i.e., the amount of resistance, in accordance with the rider's preferred movement, in some embodiments of the present application, the rear derailleur 100 is also provided with a resistance adjustment unit 160.

Referring to fig. 4 to 9, the resistance adjusting unit 160 includes a linear adjusting assembly capable of moving linearly to adjust the amount of expansion and contraction of the return elastic assembly, and a return elastic assembly capable of adjusting the magnitude of resistance between the first contact portion and the second contact portion.

That is, when the return elastic member is extended, the return force thereof is reduced, so that the acting force between the first contact portion and the second contact portion is reduced, and therefore, when the chain guide member 110 is rotated in the chain loosening direction, the one-way transmission unit locks the sleeve 152, friction is generated between the first contact portion and the second contact portion of the main shaft 140, and the acting force therebetween is reduced, so that the friction force is also reduced, and accordingly, the resistance is also reduced.

When the return elastic assembly is compressed, the return force thereof increases, so that the acting force between the first contact portion and the second contact portion increases, and therefore, when the chain guide member 110 rotates in the chain loosening direction, the one-way transmission unit locks the sleeve 152, friction is generated between the first contact portion and the second contact portion of the main shaft 140, and the acting force between the two is large, so that the friction force is also large, and accordingly, the resistance is also large.

In some embodiments of the present application, to achieve placement of the return spring assembly, referring to fig. 4-7, the lumen of the sleeve 152 includes a first lumen 1521 and a second lumen 1522 separated by a middle portion 1524, and the middle portion 1524 is formed with a through-hole (not labeled) communicating the first lumen 1521 and the second lumen 1522, the through-hole facilitating passage of the spindle 140.

The free end of the main shaft 140 passes through the first lumen 1521 and protrudes from the through-section into the second lumen 1522.

The first inner cavity 1521 has the second contact portion formed therein as described above, and in some embodiments of the present application, the contact portion of the second contact portion is a tapered groove formed by digging into the first inner cavity 1521, and a wall surface of the tapered groove is a second inclined surface 1523, where the tapered groove is communicated with the second inner cavity 1522 through the through portion.

The return spring is disposed within the second lumen 1522 and applies a return force to the intermediate portion 1524 as the linear adjustment assembly adjusts the amount of extension of the return spring.

In some embodiments of the present application, the return spring member may be selected as a spring 162 that is sleeved on the main shaft 140 located in the second inner cavity 1522, with one end receiving the adjustment force of the linear adjustment assembly and the other end abutting against the intermediate portion 1524.

Alternatively, the return elastic member may be a structure having other deformability, such as a soft rubber pad, which may be located in the second inner cavity 1522, or may be sleeved on the main shaft 140 in the second inner cavity 1522, where one end receives the adjusting force of the linear adjusting assembly, and the other end abuts against the middle portion 1524.

In some embodiments herein, the linear adjustment assembly includes an adjustment member 161.

Referring to fig. 4, the adjusting member 161 has a first threaded connection, and correspondingly, a second threaded connection is provided at the free end of the main shaft 140 within the second lumen 1522, the first and second threaded connections being threadably engaged, one end of the spring 162 abutting the adjusting member 161 and the other end abutting the intermediate portion 1524.

When the resistance is increased, the spring 162 is compressed, and at this time, the adjuster 161 is rotated in one direction, and the first screw connection portion is linearly moved along the second screw connection portion, so that the spring 162 is linearly compressed, and the acting force between the second contact portion and the first contact portion is increased, and therefore, the friction force generated by both is also increased.

If the resistance is reduced, the spring 162 needs to be reset and extended, and at this time, the adjusting member 161 is rotated in the other direction, and the first screw connection portion is linearly moved along the second screw connection portion, so that the spring 162 is linearly reset and extended, and the acting force between the second contact portion and the first contact portion is reduced, and therefore, the friction force generated by both is also reduced.

Thus, the expansion and contraction amount of the spring 162 is adjusted by adjusting the adjusting member 161 as required, so as to achieve the purpose of adjusting the resistance.

The adjustment member 161 may be a nut, see fig. 1-4 and 9, having an internal thread and the free end of the main shaft 140 is formed with an external thread 142, see fig. 8.

In some embodiments of the present application, the external thread 142 on the free end of the spindle 140 is provided with a longer length, and the portion extending from the end of the free end to the sleeved spring 162 is provided with the external thread 142, so that the range of the adjustment resistance can be enlarged.

For the user to manually adjust the resistance, referring to fig. 9, the adjusting member 161 further includes a hand-holding portion 1611, wherein a nut is connected to one side of the hand-holding portion 1611, and the hand-holding portion 1611 is located outside the P-joint member 130 (referring to fig. 1), so as to be convenient for the user to adjust.

The other side of the hand-held portion 1611 opposite to the one side of the coupling nut is engraved with a screen 1612 for adjusting the direction arrow and the resistance, for example, the clockwise direction is the resistance increasing direction (i.e., MAX), and the counterclockwise direction is the resistance decreasing direction (i.e., MIN).

In some embodiments of the present application, the hand-held portion 1611 may also be a screw having external threads formed with internal threads at the free end of the main shaft 140, with the spring 162 abutting the screw cap at one end and the intermediate portion 1524 at the other end.

The amount of expansion and contraction of the spring 162 is adjusted by adjusting the depth to which the screw extends into the spindle 140.

In order to limit the P joint member 130 and the chain guide member 110, a receiving cavity (not labeled) is provided in the P joint member 130, see fig. 4, in which a torsion spring 170 is placed with one end abutting against the P joint member 130 and the other end abutting against the protruding P joint member 130 against the chain guide member 110, in particular against the first link plate 111 (see fig. 1).

And the P-joint member 130 is further provided with a projection (not shown), and a stopper post 132 (see fig. 2) is mounted on the pivot shaft correspondingly mounted on the first link plate 111 of the chain guide member 110, the stopper post 132 being disposed corresponding to the projection.

The stopper post 132 abuts against the boss when the chain guide member 110 and the P-joint member 130 are relatively non-rotating.

When the chain guide element 110 rotates relative to the P joint element 130, the torsion spring 170 torsion forces the limit post 132 to abut against the protrusion, thereby realizing the reset after the chain guide element 110 rotates.

In some embodiments of the present application, the spindle 140 has a relief portion, and a pin hole 131 (see fig. 3) is formed on the P joint member 130 corresponding to the relief portion, where the pin hole 131 communicates with a through cavity in the P joint member 130 for penetrating the spindle 140, and the pin shaft 180 is inserted into the pin hole 131 and extends into the relief portion (see fig. 4 and 8) for limiting movement of the spindle 140 in a direction perpendicular to the axis (i.e., preventing radial movement of the spindle 140).

The relief portion may be formed on the main shaft 140 according to the structure of the main shaft 140, or may be a recess formed on the main shaft 140 as shown in fig. 8.

In some embodiments herein, referring to fig. 8, the main shaft 140 is annularly provided with an annular portion and a tapered structure forming the first contact portion as described above in a direction perpendicular to an axial direction thereof, the annular portion and the tapered structure being disposed at a spacing such that the relief portion (i.e., the recess) is formed between a portion of both located on the same side of the main shaft 140 and the main shaft 140.

When the pin shaft 180 is inserted into the insertion hole and extended into the escape portion, the pin shaft 180 is positioned at one side of the main shaft 140, so that the main shaft 140 is prevented from moving in a direction perpendicular to an axis thereof when the P joint member 130 is rotated without rotating.

The rear derailleur 100 related to the present application is capable of applying a resistance to a pivotal movement of the chain guide member 110 in a chain loosening direction by the resistance applying unit 150, avoiding rotation of the chain guide member 110 in the chain loosening direction, thereby avoiding chain loosening without affecting rotation of the chain guide member 110 in the chain tensioning direction; the rider can rotate the adjustment member 161 to adjust the degree of resistance applied to meet the user's different resistance needs.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A bicycle rear derailleur comprising a base member adapted to be mounted to a bicycle, a connecting member rotatably disposed between the base member and the movable member, a movable member rotatably disposed on the chain guide member, and a chain guide member, characterized in that the movable member comprises:

a P joint member rotatably connected to the connecting member and the chain guide member, respectively;

the main shaft penetrates through the P joint component and is fixedly connected with the chain guide component, and a first contact part is arranged on the main shaft in a surrounding mode;

a resistance force applying unit including a one-way transmission unit fixed in the P joint member and a sleeve sleeved on the main shaft and having a second contact portion in contact with the first contact portion in an inner ring, the one-way transmission unit locking the sleeve in a chain loosening direction to cause resistance between the first contact portion and the second contact portion and releasing the sleeve in a chain tensioning direction to cause no resistance between the first contact portion and the second contact portion;

the resistance adjusting unit comprises a linear adjusting component and a reset elastic piece, wherein the linear adjusting component is used for adjusting the expansion and contraction amount of the reset elastic piece, and the reset force of the reset elastic piece is used for adjusting the resistance between the first contact portion and the second contact portion.

2. The bicycle rear derailleur according to claim 1, characterized in that the contact portion of the first contact portion is designed as a first slope inclined with respect to the axis of the main shaft, and the contact portion of the second contact portion is designed as a second slope matching the inclination of the first slope.

3. The bicycle rear derailleur according to claim 1, wherein the one-way transmission unit is a one-way bearing that is fixed within the P-joint member, and the bushing is disposed within the one-way bearing and has an inner cavity.

4. The bicycle rear derailleur according to claim 3, wherein the inner cavity includes a first inner cavity and a second inner cavity separated by a middle portion, the middle portion being formed with a through portion that communicates the first inner cavity and the second inner cavity;

the main shaft wears to establish in proper order first inner chamber and second inner chamber, first inner chamber is interior to be established and is formed the second contact portion, the elastic component that resets is located in the second inner chamber when the straight line adjusting part is adjusted the flexible volume of elastic component resets, the elastic component that resets to the intermediate part applys the restoring force.

5. The bicycle rear derailleur according to claim 4, wherein the linear adjustment assembly includes:

the adjusting piece is provided with a first threaded connection part, a second threaded connection part is arranged at the free end of the main shaft in the second inner cavity, the first threaded connection part and the second threaded connection part are in threaded connection, one end of the reset elastic piece abuts against the adjusting piece, and the other end of the reset elastic piece abuts against the middle part.

6. The bicycle rear derailleur according to claim 5, wherein the adjustment member includes a nut, the first threaded connection is an internal thread of the nut, and the second threaded connection is an external thread provided at a free end of the main shaft.

7. The bicycle rear derailleur according to claim 6, wherein the adjustment member further includes a hand grip that is located outside of the P-joint member;

the nut is mounted on the hand-held portion.

8. The bicycle rear derailleur according to claim 5, wherein the adjustment member is a screw, the first threaded connection is an external thread of the screw, and the second threaded connection is an internal thread provided at a free end of the main shaft.

9. The bicycle rear derailleur according to claim 1, wherein the P-joint member has a receiving cavity formed therein, and a torsion spring is received in the receiving cavity;

one end of the torsion spring abuts against the P joint component, and the other end of the torsion spring extends out of the accommodating cavity and abuts against the chain guide component.

10. The bicycle rear derailleur according to claim 1, wherein the main shaft has a relief portion, a pin hole is provided in the P joint member corresponding to the relief portion, and a pin shaft is inserted into the pin hole and extends into the relief portion for restricting movement of the main shaft in a direction perpendicular to an axis thereof.