CN110116780B

CN110116780B - Rear derailleur and bicycle

Info

Publication number: CN110116780B
Application number: CN201910443284.4A
Authority: CN
Inventors: 刘春生; 谢尔盖·弗拉索夫
Original assignee: Zhuhai Diruile Technology Co ltd
Current assignee: Zhuhai Blueprint Sports Technology Co ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-10-16
Anticipated expiration: 2039-05-24
Also published as: CN110116780A

Abstract

The invention provides a rear derailleur and a bicycle, wherein the rear derailleur comprises a damper, the damper comprises a base with an installation position, a main shaft part and a damping mechanism, the main shaft part is rotatably installed on the base, the damping mechanism is arranged in the installation position, the first end of the main shaft part is located in the installation position, the cross section of the main shaft part is circular, the damping mechanism comprises a damping arm and an elastic fastener, the damping arm comprises a connecting rod and a brake block, the first end of the connecting rod is hinged with the brake block, the second end of the connecting rod is hinged with the base, the axial projection of the main shaft part is formed, a first connecting line is formed between the projection of a second hinge axis and the projection of the first hinge axis, a second connecting line is formed between the projection of the second hinge axis and the projection of the first hinge axis, the included angle between the first connecting line and the second connecting line is an acute angle, and the elastic fastener drives. And a bicycle provided with the rear derailleur. The rear derailleur and the bicycle have a one-way brake function, and the guide link plate can be prevented from swinging due to jolt on a rugged road.

Description

Rear derailleur and bicycle

Technical Field

The invention relates to the technical field of bicycles, in particular to a rear derailleur and a bicycle with the same.

Background

The rear derailleur is assembled on a rear flat fork of a bicycle frame and used for shifting a chain among chain wheels with different diameters of a rear cone pulley according to the gear shifting operation or the gear reversing operation of the shifter so as to realize the speed change of the bicycle. Because the length of the chain is fixed and unchangeable, in the process of speed change adjustment, when the chain is switched between sprockets with different diameters, the tensioning degree of the chain can be changed, and in order to ensure that the chain can always keep enough tensioning force, a spring is usually arranged between a base of a rear derailleur and a chain guide plate, so that the chain guide plate can move towards the chain constantly under the action of the spring, the chain guide wheel on the chain guide plate is enabled to apply pressure on the chain, the chain can always keep a tensioning state, and when the chain is switched from a large-diameter sprocket to a small-diameter sprocket, the chain cannot be loosened; when the chain is switched from the small-diameter chain wheel to the large-diameter chain wheel, the chain cannot be excessively tightened, so that the chain can be always in a proper tensioning state in the process of speed change and normal running of the bicycle.

However, when the bicycle runs on a rugged road, the bicycle bumps and vibrates, and in the process of bumping and vibrating, the impact force received by the chain guide plate easily enables the chain guide plate to overcome the acting force of the spring and move towards the loosening direction of the chain, so that the tensioning state of the chain is affected, the chain is in a loosening state, the chain is easy to fall off, fall off and the like, the riding experience is affected, and potential safety hazards exist.

Disclosure of Invention

In order to solve the above problems, a primary object of the present invention is to provide a rear derailleur that has a one-way braking function to prevent a sidelink from swinging due to jolts on a rough road.

Another object of the present invention is to provide a bicycle with a rear derailleur that has a one-way braking function to prevent the guide link plate from swinging due to bumps on a rough road and to prevent the chain from falling off the sprocket.

In order to achieve the main object of the present invention, the present invention provides a rear derailleur, comprising a fixed base, a swing assembly, a chain extending unit and a damper, wherein the damper comprises a base, a main shaft member and a damping mechanism, the swing assembly is hinged between the fixed base and the base, the base is provided with a mounting position, the main shaft member is rotatably mounted on the base around a first axis of the main shaft member, a first end of the main shaft member is positioned in the mounting position, the cross section of the first end of the main shaft member is circularly arranged, the chain extending unit is fixedly connected with a second end of the main shaft member, the damping mechanism is arranged in the mounting position, the damping mechanism comprises a damping arm and an elastic fastener, the damping arm comprises a connecting rod and a brake block, the first end of the connecting rod is rotatably connected with the brake block around a first hinge axis, the second end of the connecting rod is rotatably connected with the base around a second hinge axis, both the first hinge axis and the second, along the axial projection of the main shaft piece, a first connecting line is formed between the projection of the second hinge axis and the projection of the first axis, a second connecting line is formed between the projection of the second hinge axis and the projection of the first hinge axis, an included angle between the first connecting line and the second connecting line is an acute angle, the elastic fastener drives the brake block to abut against the outer peripheral wall of the first end of the main shaft piece, the number of the damping arms is two to eight, and more than two groups of damping arms are distributed along the circumferential direction of the main shaft piece; the elastic fasteners are installed on more than two brake blocks, or the number of the elastic fasteners is two to eight, and one elastic fastener is connected between the inner peripheral wall of the installation position and one brake block.

It is thus clear that, elastic fastener lock brake block pressfitting is on main shaft spare, make to produce frictional force between brake block and the main shaft spare, and through the connection structure and the position setting to the connecting rod, make when main shaft spare rotates along first direction, the brake block can rotate along with main shaft spare through frictional force, make the connecting rod swing toward the direction that can make the angle grow of acute angle, but because the second end of connecting rod is fixed hinge point, therefore, along with the rotation of main shaft spare, the connecting rod can not exert pressure to the brake block, and then make the brake block keep unchangeable to the pressure that main shaft spare was applyed, when the rotation of main shaft spare can overcome the biggest static frictional force between brake block and the main shaft spare, main shaft spare can slide relative brake block, make the guide link plate of being connected with main shaft spare can follow first direction normal rotation. When the main shaft element rotates along the second direction, the brake block rotates along with the main shaft element through friction force, the connecting rod swings towards the direction that the angle of the acute angle is reduced, but because the second end of the connecting rod is a fixed hinged point, the pressure applied to the brake block by the connecting rod is gradually increased along with the rotation of the main shaft element, the pressure applied to the main shaft element by the brake block is sharply increased, the maximum friction force between the brake block and the main shaft element is sharply increased along with the maximum friction force, when the rotation of the main shaft element cannot overcome the maximum static friction force between the brake block and the main shaft element, the brake block brakes the main shaft element, and the chain guide plate connected with the main shaft element cannot continue to rotate along the second direction.

The further scheme is that, when elastic fastener installs on the brake lining more than two, the quantity of damping arm is two sets of to eight groups, the damping arm more than two sets of distributes along the circumference of main shaft spare, be provided with first draw-in groove on the brake lining, first draw-in groove sets up and runs through the brake lining along the circumference of main shaft spare, the opening of first draw-in groove sets up to main shaft spare dorsad, elastic fastener is the jump ring, the jump ring block is in the first draw-in groove of the brake lining more than two, jump ring pulling brake lining butt is served at the first of main shaft spare.

From top to bottom, the quantity of damping arm can be set up according to the installation space of base, required resistance size. And adopt the jump ring as elastic fastener for can be through an elastic fastener with the brake shoes pressfitting of a plurality of damping arms on main shaft spare, the structure of the attenuator of simplification. First draw-in groove on the brake lining can carry on spacingly to elastic fastener, prevents that elastic fastener from deviating from the brake lining, guarantees the reliability of brake lining braking and the stability of attenuator work.

Still further scheme is, the base includes body and ring body, is provided with the mounting groove on the body, ring body fixed mounting is in the mounting groove, and the ring body has the installation position, the second end of connecting rod is articulated with the ring body, main shaft part is including being coaxial axis body and the axle cap that sets up, the axis body is rotationally installed on the body around the second axis of self, the first end and the axle cap detachably of axis body are connected, the axle cap is located the installation position, the circular setting of transversal personally submitting of axle cap, the periphery wall butt of brake block and axle cap.

It is from top to bottom visible, can cause certain wearing and tearing to base and main shaft part in the damping arm working process, and all set up base and main shaft part and be the components of a whole that can function independently structure, and it is articulated with the connecting rod with the ring body of base, the axle cap and the brake block of main shaft part adjoin, make when ring body and/or axle cap excessively wear and tear, can prolong the life of attenuator and promote the maintainability of attenuator through the form of changing ring body and/or axle cap, thereby the attenuator is scrapped when avoiding the base wearing and tearing, and when avoiding main shaft part wearing and tearing, need change whole main shaft part.

The body still sets up the second draw-in groove in the circumference of mounting groove, and second draw-in groove and mounting groove intercommunication are provided with the lug on the periphery wall of ring body, and the lug block is at the second draw-in groove, axis body and axle cap key-type connection.

It is from top to bottom visible, the connection structure who adopts draw-in groove, lug is connected body and ring body, can make the change of ring body, install convenience more, and on the same way, the mode that adopts the key-type connection is connected axis body and axle cap, can enough make the change of axle cap, install convenience more, can make axle cap and axis body keep synchronous rotation again.

In order to achieve the main object of the present invention, the rear derailleur provided by the present invention may further include a fixing base, a swing assembly, a chain extending unit and a damper, wherein the damper includes a base, a main shaft member and a damping mechanism, the swing assembly is hinged between the fixing base and the base, the base has a mounting position, a cross section of the mounting position is circularly disposed, the main shaft member is rotatably mounted on the base around a first axis thereof, a first end of the main shaft member is located in the mounting position, the damping mechanism is disposed in the mounting position, the damping mechanism includes a damping arm and an elastic fastening member, the damping arm includes a connecting rod and a brake block, the first end of the connecting rod is rotatably connected to the brake block around the first hinge axis, the second end of the connecting rod is rotatably connected to the main shaft member around the second hinge axis, a surface of the brake block facing an inner peripheral wall of the mounting position is disposed in an arc, The second hinge axis is parallel to the first axis and along the axial projection of the main shaft piece, a first connecting line is formed between the projection of the first hinge axis and the projection of the first axis, a second connecting line is formed between the projection of the first hinge axis and the projection of the second hinge axis, an included angle between the first connecting line and the second connecting line is an acute angle, and the elastic fastener drives the brake block to abut against the inner peripheral wall of the installation position.

Therefore, the elastic fastener pushes the brake block to be pressed on the inner peripheral wall of the installation position, so that friction force is generated between the brake block and the inner peripheral wall of the installation position, and the connecting mechanism and the position of the connecting rod are arranged, so that when the main shaft part rotates along the first direction, the main shaft part can pull the connecting rod and the brake block to rotate along with the main shaft part, so that the connecting rod swings towards the direction which can increase the angle of the acute angle, but the first end of the connecting rod is a fixed hinged point, so that the connecting rod can drag the brake block to move along with the rotation of the main shaft part and can not apply pressure to the brake block, and further the pressure applied to the main shaft part by the brake block is kept unchanged or reduced; when the rotation of main shaft spare can make the brake block overcome the biggest static friction force between the internal perisporium of brake block and installation position, the brake block can slide relative to the internal perisporium of installation position to with the connecting rod along the rotation of main shaft spare and remove, make main shaft spare and rather than the chain guide plate who connects can follow first direction normal rotation. When the main shaft element rotates along the second direction, the main shaft element pushes the connecting rod and the brake block, and the connecting rod swings towards the direction that the acute angle is reduced, but as the first end of the connecting rod is a fixed hinged point and friction force exists between the brake block and the inner peripheral wall of the installation position, the brake block keeps relatively static with the inner peripheral wall of the installation position through the friction force along with the rotation of the main shaft element; and when the main shaft element cannot overcome the maximum friction force between the brake block and the inner peripheral wall of the mounting position through rotation, the damping arm brakes the main shaft element, so that the chain guide plate connected with the main shaft element cannot continuously rotate along the second direction.

The further scheme is that the quantity of damping arm is two sets of to eight groups, and the damping arm more than two sets of distributes along the circumference of main shaft spare, is provided with first draw-in groove on the ram block, and first draw-in groove sets up and runs through the ram block along the circumference of main shaft spare, and the opening of first draw-in groove sets up towards the main shaft spare, and elastic fastener is the jump ring, and the jump ring block is in the first draw-in groove of the ram block more than two, and the jump ring promotes the ram block butt on the internal perisporium of installation position.

From top to bottom, the quantity of damping arm can be set up according to the installation space of base, required resistance size. And adopt the jump ring as elastic fastener for can be through an elastic fastener with the brake shoes pressfitting of a plurality of damping arms on the internal perisporium wall of installation position, the structure of the attenuator of simplification. First draw-in groove on the brake lining can carry on spacingly to elastic fastener, prevents that elastic fastener from deviating from the brake lining, guarantees the reliability of brake lining braking and the stability of attenuator work.

Still further scheme is, the base includes body and ring body, is provided with the mounting groove on the body, and ring body fixed mounting encloses into the mounting position between ring body and the body, the internal perisporium butt of brake block and ring body, and main shaft part is including being axis body and the axle cap of coaxial setting, and the axis body is rotationally installed on the body around the second axis of self, and the first end and the axle cap detachably of axis body are connected, and the axle cap is located the mounting position, and the second end and the axle cap of connecting rod are articulated.

It is from top to bottom visible, can cause certain wearing and tearing to base and main shaft part in the damping arm working process, and all set up base and main shaft part and be the components of a whole that can function independently structure, and adjoin to the ring body of base with the brake block, the axle cap and the connecting rod of main shaft part are articulated, make when ring body and/or axle cap excessively wear and tear, can prolong the life of attenuator and promote the maintainability of attenuator through the form of changing ring body and/or axle cap, thereby when avoiding the base wearing and tearing, the attenuator is scrapped, and when avoiding main shaft part wearing and tearing, need change whole main shaft part.

The body still sets up the second draw-in groove in the circumference of mounting groove, and second draw-in groove and mounting groove intercommunication are provided with the lug on the periphery wall of ring body, and the lug block is in the second draw-in groove, axis body and axle cap key-type connection.

To achieve another object of the present invention, the present invention provides a bicycle comprising a rear derailleur, wherein the rear derailleur is the rear derailleur according to any one of claims 1 to 8 above.

Further, the number of the damping arms is three or four.

It can be seen from the above that, through the structural design of the damper for the rear derailleur, when the bicycle runs on a rugged road and is in a non-speed change state, the rear derailleur can not be affected by jolting and vibration, so that the chain guide plate cannot swing relative to the base, and the current position state is maintained, thereby preventing the chain from loosening and falling off.

Drawings

FIG. 1 is a block diagram of a first embodiment of the bicycle of the present invention.

FIG. 2 is a partial cross-sectional view of the bicycle showing the first embodiment of the present invention with parts of the components omitted.

FIG. 3 is a structural diagram of the base frame of the first embodiment of the bicycle of the present invention.

FIG. 4 is a cross-sectional view of the damper with parts broken away of the bicycle illustrated in accordance with the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of the damper for the first embodiment of the bicycle of the present invention.

FIG. 6 is a block diagram of the brake shoes of the first embodiment of the bicycle of the present invention.

FIG. 7 is an exploded view of the main axle element of the first embodiment of the bicycle of the present invention.

FIG. 8 is a cross-sectional view of a second embodiment of the bicycle damper of the present invention.

FIG. 9 is an exploded perspective view of a brake block of the second embodiment of the bicycle of the present invention.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

First embodiment of bicycle:

as shown in fig. 1, the bicycle includes a frame, a hub, a front cone, a rear cone, a chain, a shift cable, a shifter and a rear derailleur 100. The frame has two and is relative first back vent and the second back vent that sets up, and wheel hub rotationally installs respectively on first back vent, second back vent around the axis of self, and wheel hub is located between first back vent and the second back vent. The rear cone pulley is fixedly connected with one end of the hub, so that the rear cone pulley can drive the hub to rotate. The front cone pulley is rotatably arranged in the middle of the bicycle around the axis of the front cone pulley and is connected with the pedal through a crank, so that the front cone pulley can be driven to rotate by stepping on the pedal. The chain is wound between the front cone pulley and the rear cone pulley, so that the front cone pulley can drive the rear cone pulley to rotate through the chain when rotating. Wherein, the front cone pulley and the rear cone pulley are provided with a plurality of chain wheels with different diameters. The shifter is mounted on the handlebar of the frame and controls the rear derailleur 100 through a shift wire to shift the chain between the various different diameter sprockets of the rear cone.

The rear derailleur 100 includes a fixed base 101, a swing assembly 102, a tension chain unit 103, a damper 10 and a torsion spring, wherein the fixed base 101 has a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected with a first rear fork of the frame, so that the rear derailleur 100 is fixed to the frame.

The swing assembly 102 is hinged between the fixed seat 101 and the damper 10, and specifically, the swing assembly 102 includes a first link 1021, a second link 1022 and a spring, a first end of the first link 1021 is hinged with the second connecting portion of the fixed seat 101, and a first end of the second link 1022 is hinged with the second connecting portion of the fixed seat 101. The spring is used for resetting the swinging of the first connecting rod and the second connecting rod.

The tension chain unit 103 includes a chain guide plate 1031, a first sprocket 1032 rotatably mounted about its axis at a first end of the chain guide plate 1031, and a second sprocket 1033 rotatably mounted about its axis at a second end of the chain guide plate 1031. A portion of the chain is located between and meshes with the first and

second sprockets

1032, 1033, respectively.

Referring to fig. 2 and 3, the damper 10 includes a base 1, a main shaft member 2 and a damping mechanism, wherein the base 1 is hinged to the second end of the first link 1021 and the second end of the second link 1022, the main shaft member 2 is rotatably mounted on the base 1 around a first axis thereof, and a first end of the chain guide plate 1031 is fixedly connected to the second end of the main shaft member 2, so that the damper 10 and the chain expanding unit 103 connected to the damper 10 can swing relative to the rear pulley through the swing assembly 102, and the chain expanding unit 103 can shift the chain to switch among a plurality of sprockets with different diameters of the rear pulley.

The base 1 is provided with an accommodating cavity 114 and an installation position 113, the accommodating cavity 114 is located on the circumferential direction of the main shaft element 2, the torsion spring is installed in the accommodating cavity 114, and the chain guide plate 1031 covers the opening of the accommodating cavity 114 to prevent the torsion spring from being separated from the accommodating cavity 114. The two ends of the torsion spring are respectively connected with the base 1 and the chain guide plate 1031, and the torsion spring is used for driving the chain guide plate 1031 to rotate around the first direction R1 through the main shaft element 2, so that the second chain wheel 1033 of the chain guide plate 1031 compresses the chain, the chain has sufficient tension force, and the chain is prevented from falling off from the front cone pulley and/or the rear cone pulley. Wherein, first sprocket 1032 is coaxial setting with main shaft element 2, because first sprocket 1032 is close to the setting of base 1, consequently, first sprocket 1032 is the leading wheel, and it mainly plays the effect of leading the chain, is used for stirring the chain and switches between the different sprockets of a plurality of diameters at back step pulley. Since the second sprocket 1033 is located at an end of the chain guiding plate 1031 away from the base 1, the second sprocket 1033 is a tension wheel, which mainly acts as the aforementioned tension wheel to compress the chain, so as to prevent the chain from having sufficient tension force, prevent the chain from falling off from the front cone pulley and/or the rear cone pulley, and ensure that the chain can be reliably engaged with the front cone pulley and the rear cone pulley.

With reference to fig. 4 and 5, the base 1 is further provided with an installation position 113, the first end of the main shaft element 2 is located in the installation position 113, and the cross section of the first end of the main shaft element 2 is circular. A damping mechanism is provided in the mounting location 113, which comprises a damping arm 3 and a resilient fastener 4.

The damping arm 3 comprises a connecting rod 31 and a brake shoe 32, a first end of the connecting rod 31 being hinged to the brake shoe 32, i.e. the first end of the connecting rod 31 is rotatably connected to the brake shoe 32 about a first hinge axis. The second end of the connecting rod 31 is hinged to the base 1, i.e. the second end of the connecting rod 31 is rotatably connected to the base 1 about a second hinge axis. The second end of the connecting rod 31 is a fixed hinge point, that is, for the swinging manner of the damping arm 3, the damping arm 3 is regarded as swinging around the second hinge axis as a whole, that is, the whole combination of the connecting rod 31 and the brake block 32 is regarded as swinging around the second hinge axis, therefore, the connecting rod 31 and the brake block 32 hinged thereto can swing as a whole relative to the base 1, that is, the damping arm 3 can swing around the second hinge axis relative to the base 1.

In addition, the first hinge axis and the second hinge axis are both parallel to the first axis of the main shaft element 2, so that the damping arm 3 can only swing in a plane parallel to the cross section of the main shaft element 2, and along the axial projection of the main shaft element 2, a first connection line L1 is formed between the projection of the second hinge axis and the projection of the first axis of the main shaft element 2, a second connection line L2 is formed between the projection of the second hinge axis and the projection of the first hinge axis, and an included angle is formed between the first connection line L1 and the second connection line L2, and the included angle is an acute angle a, that is, in a natural state, along the first direction R1, the first end of the connecting rod 31 is located at the downstream end of the second end of the connecting rod 31, so that if the connecting rod 31 can swing around the second hinge axis to be collinear with the first connection line L1, the first end of the connecting rod 31 gradually approaches the first axis of the main shaft element 2 during the swing process. Further, the elastic fastener 4 drives the shutter block 32 to abut on the outer peripheral wall of the first end of the main shaft element 2, so that there is a frictional force between the shutter block 32 and the main shaft element 2. Preferably, one surface of the brake shoe 32 facing the main shaft 2 is an arc surface, through which the brake shoe 32 abuts the main shaft 2, and by setting the surface of the brake shoe 32 abutting the main shaft 2 to be an arc surface, a large contact area can be provided between the brake shoe 32 and the main shaft 2, so that when the main shaft 2 has a tendency to rotate relative to the brake shoe 32, a good frictional force can be generated between the main shaft 2 and the brake shoe 32.

Through the above, when base 1 is an organic whole, main shaft 2 is an organic whole, the second end of connecting rod 31 can directly articulate with base 1, brake block 32 can directly adjoin with the periphery wall of the first end of main shaft 2, but because in the work process of damping arm 3, the articulated of connecting rod 31 and base 1 can cause wearing and tearing to base 1, the adjacent of brake block 32 and main shaft 2 can cause wearing and tearing to main shaft 2, lead to the maintainability of attenuator 10 poor, make when base 1 wears out, attenuator 10 can only be scrapped, when main shaft 2 wears out, need change whole main shaft 2.

Therefore, in order to improve maintainability of the damper 10 and extend the service life of the base 1, the base 1 and the main shaft element 2 may be configured as follows:

the base 1 is arranged into a component structure, specifically, the base 1 includes a body 11 and a ring 12, the accommodating cavity 114 is arranged on the body 11, the body 11 is further provided with a mounting groove 111, the ring 12 is fixedly mounted in the mounting groove 111, and a mounting position 113 is enclosed between the ring 12 and the body 11. When the second end of the connecting rod 31 is hinged to the base 1, the second end of the connecting rod 31 is hinged to the ring body 12 of the base 1.

The main shaft element 2 is arranged to be of a component structure, specifically, the main shaft comprises a shaft body 21 and a shaft cap 22, the shaft body 21 and the shaft cap 22 are coaxially arranged, the shaft body 21 is rotatably installed on the body 11 around a second axis of the shaft body, the accommodating cavity 114 is located in the circumferential direction of the shaft body 21, and a first end of the chain guide plate 1031 is fixedly connected with a second end of the shaft body 21. The first end of the shaft body 21 is detachably connected with the shaft cap 22, and the shaft body 21 and the shaft cap 22 keep rotating synchronously. The shaft cap 22 is located in the mounting position 113, and the cross section of the shaft cap 22 is circular. When the gate 32 abuts the first end of the main shaft element 2, the gate 32 abuts the outer peripheral wall of the cap 22.

It can be seen that, providing the base 1 and the main shaft element 2 as separate structures, and hinging the ring body 12 of the base 1 with the connecting rod 31 and the shaft cap 22 of the main shaft element 2 with the brake block 32, enables to prolong the service life of the damper 10 and to improve the maintainability of the damper 10 by replacing the form of the ring body 12 and/or the shaft cap 22 when the ring body 12 and/or the shaft cap 22 are excessively worn.

With reference to fig. 6, further, the body 11 is provided with a plurality of second clamping grooves 112 in the axial direction of the mounting groove 111, the plurality of second clamping grooves 112 are distributed along the circumferential direction of the mounting groove 111, each second clamping groove 112 is communicated with the mounting groove 111, the outer circumferential wall of the ring body 12 is provided with a protruding block 121, the protruding block 121 is clamped in the second clamping groove 112, and the body 11 and the ring body 12 are connected by adopting a connecting structure of the clamping grooves and the protruding blocks, so that the ring body 12 can be replaced and more convenient to install. Preferably, a key connection is used between the shaft body 21 and the shaft cap 22, for example, in this embodiment, a connection key 211 is disposed at a first end of the shaft body 21, and a key groove 221 is disposed at a middle portion of the shaft cap 22, when the shaft cap 22 is connected to the shaft body 21, the connection key 211 of the shaft body 21 is directly inserted into the key groove 221 of the shaft cap 22, so that the connection between the shaft body 21 and the shaft cap 22 can be achieved, and the shaft body 21 and the shaft cap 22 can keep synchronous rotation. Of course, the ring body 12 may also be directly and fixedly connected to the body 11 by other connection methods such as bolts, and similarly, the shaft cap 22 may also be directly and fixedly connected to the shaft body 21 by other connection methods such as bolts.

In addition, the number of the damping arms 3 can be set according to the installation space of the base 1 and the required resistance, the number of the damping arms 3 can be preferably set to two to eight groups, more than two groups of the damping arms 3 are distributed along the circumferential direction of the main shaft element 2, and by setting the plurality of groups of the damping arms 3, the friction force between the brake block 32 and the main shaft element 2 can be more uniform and stable, so that the damping performance of the damper 10 is more stable. In the present embodiment, the number of the damping arms 3 is preferably four.

With reference to fig. 7, preferably, each brake shoe 32 is provided with a first engaging groove 321, the first engaging groove 321 is disposed along the circumferential direction of the main shaft 2 and penetrates through the brake shoe 32, an opening of the first engaging groove 321 is disposed opposite to the main shaft 2, the elastic fastener 4 is a snap spring, the snap spring is engaged in the first engaging groove 321 of more than two brake shoes 32, and the snap spring has an elastic force that contracts towards the inside, so that the snap spring pulls the brake shoe 32 to abut against the first end of the main shaft 2. The clamp spring is adopted as the elastic fastening piece 4, so that the brake blocks 32 of the damping arms 3 can be pressed on the main shaft element 2 through one elastic fastening piece 4, and the structure of the damper 10 is simplified. The first clamping groove 321 in the brake shoe 32 can limit the elastic fastener 4, prevent the elastic fastener 4 from being separated from the brake shoe 32, and ensure the braking reliability of the brake shoe 32 and the working stability of the damper 10.

Of course, since the second end of the connecting rod 31 is a fixed hinge point, a compression spring may also be used as the elastic fastening member 4, that is, a compression spring is disposed between each brake block 32 and the inner peripheral wall of the mounting position 113, so that the compression spring presses the brake block 32 on the second end of the main shaft 2 by its own elastic force, and the brake block 32 abuts against the main shaft 2.

The operation of the damper 10 will be briefly explained below with reference to fig. 5:

when the chain is switched from the gear with a large diameter to the gear with a small diameter of the rear step pulley, the chain guide plate 1031 drives the main shaft element 2 to rotate, so that the main shaft element 2 rotates in the first direction R1, and the second sprocket 1033 on the chain guide plate 1031 presses the chain. At this time, because the friction force exists between the brake shoe 32 and the main shaft 2, the brake shoe 32 can follow the movement of the main shaft 2 or generate a tendency of following the movement of the main shaft 2 by the friction force, so that the connecting rod 31 can swing in a direction of increasing the angle of the acute angle a or has a tendency of swinging in a direction of increasing the angle of the acute angle a, but because the second end of the connecting rod 31 is a fixed intersection point, the connecting rod 31 does not apply pressure to the brake shoe 32 along with the rotation of the main shaft 2, so that the pressure applied to the main shaft 2 by the brake shoe 32 is kept constant or reduced.

Because the chain guide plate 1031 can rotate along the first direction R1 to reset under the action of the elastic force of the torsion spring, and the torsion spring drives the chain guide plate 1031 to reset, so that the chain guide plate 1031 generates a force for driving the main shaft element 2 to rotate along the first direction R1, which is enough for enabling the rotation of the main shaft element 2 to overcome the maximum static friction force between the brake block 32 and the main shaft element 2, thereby enabling the main shaft element 2 and the brake block 32 to slide relatively, and at the moment, the chain guide plate 1031 can drive the main shaft element 2 to normally rotate along the first direction R1.

When the main shaft 2 rotates along the second direction R2, the brake block 32 moves along with the main shaft 2 by friction force, so that the connecting rod 31 can swing in a direction that the angle of the acute angle a becomes smaller, but because the second end of the connecting rod 31 is a fixed hinge point, the connecting rod 31 is driven by the brake block 32 along with the rotation of the main shaft 2, so that the connecting rod 31 has a tendency of being compressed, but because the connecting rod 31 is a rigid member, the connecting rod 31 reversely applies pressure to the brake block 32 through the base 1, and the pressure gradually increases along with the rotation of the main shaft 2 to prevent the compression tendency, so that the pressure applied to the main shaft 2 by the brake block 32 also sharply increases, and thus the maximum static friction force between the brake block 32 and the main shaft 2 also sharply increases.

When the bicycle runs on a rough road, the chain guide plate 1031 swings due to jolting and vibration, but when the main shaft member 2 rotates in the second direction R2 under the driving of the jolting and vibration of the chain guide plate 1031, the force exerted on the main shaft member 2 by the chain guide plate 1031 is not enough to enable the main shaft member 2 to overcome the maximum static friction force between the brake block 32 and the main shaft member 2 after overcoming the elastic force of the torsion spring, so that the brake block 32 brakes the main shaft member 2, the chain guide plate 1031 is prevented from driving the main shaft member 2 to rotate in the second direction R2, and the chain guide plate 1031 is prevented from swinging in the direction of loosening the chain.

However, when the bicycle needs to be shifted, so that the chain guide 1031 rotates the main shaft element 2 in the second direction R2 to switch the chain from the gear with a small diameter of the rear cone to the gear with a large diameter, the force applied to the chain guide 1031 by the tension of the chain, which causes the chain guide 1031 to rotate the main shaft element 2 in the second direction R2, is enough to overcome the sum of the elastic force of the torsion spring and the maximum static friction force between the brake shoe 32 and the main shaft element 2, so that the main shaft element 2 rotates in the second direction R2 and the chain guide 1031 swings in the second direction R2.

Second embodiment of the bicycle:

applying the inventive concept of the first embodiment of the bicycle, the second embodiment of the bicycle differs from the first embodiment in the structural design of the damper 50.

Specifically, as shown in fig. 8, the damper 50 in this embodiment includes a base 5, a main shaft member 6 and a damping mechanism, wherein the base 5 is hinged to the second end of the first link and the second end of the second link of the swing assembly, the main shaft member 6 is rotatably mounted on the base 5 around its first axis, and the first end of the chain guiding plate is fixedly connected to the second end of the main shaft member 6, so that the damper 50 and the chain tensioning unit connected to the damper 50 can swing relative to the rear tower wheel through the swing assembly, thereby enabling the chain tensioning unit to toggle the chain among a plurality of sprockets with different diameters of the rear tower wheel.

The base 5 is provided with an accommodating cavity and an installation position 513, the accommodating cavity is located on the circumferential direction of the main shaft element 6, the torsion spring is installed in the accommodating cavity, and the guide chain plate covers the opening of the accommodating cavity to prevent the torsion spring from being separated from the accommodating cavity. The two ends of the torsion spring are respectively connected with the base 5 and the chain guide plate, the torsion spring is used for driving the chain guide plate to rotate around the first direction R3 through the main shaft element 6, so that the second chain wheel of the chain guide plate compresses the chain, the chain has enough tension force, and the chain is prevented from falling off from the front cone pulley and/or the rear cone pulley. Wherein the first chain wheel is arranged coaxially with the main shaft element 6.

The base 5 is further provided with a mounting position 513, the mounting position 513 is arranged in a circular shape in cross section, and the first end of the main shaft element 6 is located in the mounting position 513. A damping mechanism is provided in the mounting location 513, which comprises a damping arm 7 and a resilient fastener 8.

The damping arm 7 comprises a connecting rod 71 and a brake shoe 72, a first end of the connecting rod 71 being hinged to the brake shoe 72, i.e. the first end of the connecting rod 71 is rotatably connected to the brake shoe 72 about a first hinge axis. The second end of the connecting rod 71 is hinged to the first end of the main shaft element 6, i.e. the second end of the connecting rod 71 is rotatably connected to the first end of the main shaft element 6 about a second hinge axis. The second end of the connecting rod 71 is a fixed hinge point, that is, for the swinging manner of the damping arm 7, the damping arm 7 is regarded as swinging around the first hinge axis as a whole, that is, the whole combination of the connecting rod 71 and the brake block 72 is regarded as swinging around the first hinge axis, therefore, the connecting rod 71 and the brake block 72 hinged thereto can swing as a whole relative to the main shaft member 6, that is, the damping arm 7 can swing around the first hinge axis relative to the main shaft member 6.

Furthermore, the first hinge axis and the second hinge axis are both parallel to the first axis of the main shaft element 6, so that the damping arm 7 can only swing in a plane parallel to the cross section of the main shaft element 6, and along the axial projection of the main shaft element 6, a first connection line L3 is formed between the first hinge axis and the first axis of the main shaft element 6, a second connection line L4 is formed between the second hinge axis and the first hinge axis, and the included angle between the first connection line L3 and the second connection line L4 is an acute angle B, i.e. naturally, along the first direction R3, the first end of the connecting rod 31 is located at the upstream end of the second end of the connecting rod 31, so that if the connecting rod 71 can swing around the second hinge axis to be collinear with the first connection line L3, the second end of the connecting rod 71 gradually approaches the first axis of the main shaft element 6 during the swing process. Furthermore, the elastic fastener 8 drives the brake shoe 72 to abut on the inner circumferential wall of the mounting location 513, so that there is a frictional force between the brake shoe 72 and the inner circumferential wall of the mounting location 513. Preferably, one surface of the brake block 72 facing the inner circumferential wall of the mounting position 513 is provided as an arc surface, the brake block 72 is adjacent to the inner circumferential wall of the mounting position 513 through the arc surface, and the surface of the brake block 72 adjacent to the inner circumferential wall of the mounting position 513 is provided as the arc surface, so that a large contact area between the brake block 72 and the main shaft member 6 can be provided, and thus when the brake block 72 has a tendency to slide relative to the inner circumferential wall of the mounting position 513, a good frictional force can be generated between the inner circumferential wall of the mounting position 513 and the brake block 72.

It can be known from the above that, when the base 5 is an integrated piece and the main shaft 6 is an integrated piece, the second end of the connecting rod 71 can be directly hinged to the main shaft 6, and the brake block 72 can be directly adjacent to the base 5, but in the working process of the damping arm 7, the connecting rod 71 and the base 5 can be directly hinged to the base 5, and the main shaft 6 can be worn by the connection of the brake block 72 and the main shaft 6, so that the maintainability of the damper 50 is poor, when the base 5 is worn, the damper 50 can only be scrapped, and when the main shaft 6 is worn, the whole main shaft 6 needs to be replaced.

Therefore, in order to improve maintainability of the damper 50 and extend the service life of the base 5, the base 5 and the main shaft member 6 may be configured as follows:

the base 5 is arranged into a component structure, specifically, the base 5 includes a body 51 and a ring body 52, the accommodating cavity is arranged on the body 51, the body 51 is further provided with a mounting groove 511, the ring body 52 is fixedly mounted in the mounting groove 511, a mounting position 513 is enclosed between the ring body 52 and the body 51, and the cross section of the inner ring of the ring body 52 is arranged in a circular shape. When the gate 72 abuts the inner peripheral wall of the mounting location 513, even though the gate 72 abuts the inner race of the ring 52.

The main shaft element 6 is arranged into a component structure, specifically, the main shaft comprises a shaft body 61 and a shaft cap 62, the shaft body 61 and the shaft cap 62 are coaxially arranged, the shaft body 61 is rotatably installed on the body 51 around a second axis of the shaft body, the accommodating cavity is located in the circumferential direction of the shaft body 61, and a first end of the chain guide plate is fixedly connected with a second end of the shaft body 61. The first end of the shaft body 61 is detachably connected with the shaft cap 62, and the shaft body 61 and the shaft cap 62 rotate synchronously, and the shaft cap 62 is located in the mounting position 513. When the second end of the connecting rod 71 is hinged to the main shaft member 6, the second end of the connecting rod 71 is hinged to the ring body 52 of the main shaft member 6.

It can be seen that, providing the base 5 and the main shaft element 6 as separate structures, and abutting the ring body 52 of the base 5 with the brake shoes 72 and hinging the shaft cap 62 of the main shaft element 6 with the connecting rod 71, makes it possible to extend the life span of the damper 50 and to improve the maintainability of the damper 50 by replacing the form of the ring body 52 and/or the shaft cap 62 when the ring body 52 and/or the shaft cap 62 are excessively worn.

Further, body 51 is provided with a plurality of second draw-in grooves 512 in the axial of mounting groove 511, and a plurality of second draw-in grooves 512 distribute along the circumference of mounting groove 511, and each second draw-in groove 512 all communicates with mounting groove 511, is provided with lug 521 on the periphery wall of ring body 52, and lug 521 block is in second draw-in groove 512, and the connection structure who adopts draw-in groove, lug connects body 51 and ring body 52, can make the change of ring body 52, install more convenient. Preferably, adopt the key-type connection between axis body 61 and the axle cap 62, for example, in this embodiment, be provided with the connection key on the first end of axis body 61, and the middle part of axle cap 62 is provided with the keyway, and when axle cap 62 is connected with axis body 61, directly can realize being connected of axis body 61 and axle cap 62 in inserting the connection key of axis body 61 in the keyway of axle cap 62 to make axis body 61 and axle cap 62 keep synchronous rotation. Of course, the ring body 52 may also be directly and fixedly connected to the body 51 by other connection methods such as bolts, and similarly, the shaft cap 62 may also be directly and fixedly connected to the shaft body 61 by other connection methods such as bolts.

In addition, the number of the damping arms 7 may be set according to the installation space of the base 5 and the required resistance, the number of the damping arms 7 may preferably be set to two to eight groups, two or more groups of the damping arms 7 are distributed along the circumferential direction of the main shaft member 6, and by providing a plurality of groups of the damping arms 7, the frictional force between the brake shoes 72 and the main shaft member 6 can be more uniform and stable, thereby making the damping performance of the damper 50 more stable. In the present embodiment, the number of damping arms 7 is preferably three.

With reference to fig. 9, preferably, each of the brake shoes 72 is provided with a first locking slot 721, the first locking slot 721 is disposed along the circumferential direction of the main shaft 6 and penetrates through the brake shoes 72, an opening of the first locking slot 721 is disposed toward the main shaft 6, the elastic fastener 8 is a snap spring, the snap spring is clamped in the first locking slots 721 of the two or more brake shoes 72, and the snap spring has an elastic force expanding toward the outside, so that the snap spring pushes the brake shoes 72 to abut against the ring body 52. The snap spring is adopted as the elastic fastening piece 8, so that the brake blocks 72 of the damping arms 7 can be pressed on the ring body 52 through one elastic fastening piece 8, and the structure of the damper 50 is simplified. First draw-in groove 721 on the floodgate piece 72 can carry on spacingly to elastic fastener 8, prevents that elastic fastener 8 from deviating from on floodgate piece 72, guarantees the reliability of floodgate piece 72 braking and the stability of attenuator 50 work.

Of course, since the second end of the connecting rod 71 is a fixed hinge point, a compression spring can also be used as the elastic fastener 8, that is, the compression spring is arranged between each brake block 72 and the main shaft element 6, so that the compression spring presses the brake block 72 on the ring body 52 by its own elastic force, and the brake block 72 abuts against the ring body 52.

The operation of the damper 50 will be briefly explained below with reference to fig. 8:

when the chain is switched from the gear with the large diameter of the rear cone pulley to the gear with the small diameter, the chain guide plate drives the main shaft element 6 to rotate, so that the main shaft element 6 rotates along the first direction R3, and the second chain wheel on the chain guide plate compresses the chain. At this time, since the second end of the connecting rod 71 is hinged on the main shaft member 6, the connecting rod 71 can follow the main shaft member 6 to rotate. However, since the brake shoes 72 are pressed on the inner peripheral wall of the mounting location 513 and have friction with the inner peripheral wall of the mounting location 513, the connecting rod 71 tends to swing in a direction in which the angle of the acute angle B becomes larger, but since the connecting rod 71 moves along with the main shaft element 6, the connecting rod 71 does not apply pressure to the brake shoes 72 as the main shaft element 6 rotates in the first direction R3, so that the pressure applied by the brake shoes 72 to the inner peripheral wall of the mounting location 513 remains unchanged or is reduced.

Because the chain guide plate can rotate along the first direction R3 and reset under the action of the elasticity of the torsion spring, and the torsion spring drives the chain guide plate to reset, the chain guide plate generates a force for driving the main shaft element 6 to rotate along the first direction R3, the maximum static friction force between the brake block 72 and the inner peripheral wall of the installation position 513 can be overcome by the rotation of the main shaft element 6, so that the brake block 72 can slide relative to the inner peripheral wall of the installation position 513, and at the moment, the chain guide plate can drive the main shaft element 6 to normally rotate along the first direction R3.

When the main shaft element 6 rotates in the second direction R4, the connecting rod 71 can swing with respect to the main shaft element 6 because the second end of the connecting rod 71 is hinged to the main shaft element 6. However, since the connecting rod 71 is a rigid member, the connecting rod 71 applies a pressure to the brake pad 72 in the opposite direction through the main shaft member 6, and the pressure gradually increases along with the rotation of the main shaft member 6 to prevent the tendency of compression, so that the pressure applied by the brake pad 72 to the inner peripheral wall of the mounting location 513 also increases sharply, and the maximum static friction force between the brake pad 72 and the inner peripheral wall of the mounting location 513 also increases sharply.

When the bicycle runs on a rugged road, the chain guide plate can swing due to jolt and vibration, but when the chain guide plate is driven by jolt and vibration and the main shaft element 6 rotates along the second direction R4, the force exerted on the main shaft element 6 by the chain guide plate is not enough to enable the main shaft element 6 to overcome the maximum static friction force between the brake block 72 and the inner peripheral wall of the mounting position 513 after overcoming the elastic force of the torsion spring, so that the brake block 72 brakes the main shaft element 6, the chain guide plate is prevented from driving the main shaft element 6 to rotate along the second direction R4, and the chain guide plate is prevented from swinging along the direction of enabling the chain to loosen.

However, when the bicycle needs to be shifted to shift the speed of the bicycle, so that the chain guide plate drives the main shaft element 6 to rotate in the second direction R4 to switch the chain from the gear with a small diameter of the rear cone pulley to the gear with a large diameter, the force applied to the chain guide plate by the tensioning to drive the main shaft element 6 to rotate in the second direction R4 is enough to overcome the sum of the elastic force of the torsion spring and the maximum static friction force between the brake shoe 72 and the inner peripheral wall of the mounting position 513, so that the main shaft element 6 rotates in the second direction R4 and the chain guide plate swings in the second direction R4.

In summary, the bicycle provided by the invention has the advantages that through the structural design of the damper of the rear derailleur, when the bicycle runs on a rugged road and is in a non-speed change state, the rear derailleur can not be influenced by jolt and vibration, so that the chain guide plate cannot swing relative to the base, the current position state is kept, and the chain is prevented from loosening and falling off.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.

Claims

1. Rear derailleur is including fixing base, swing subassembly, chain unit and attenuator, its characterized in that:

the damper includes:

the swinging assembly is hinged between the fixed seat and the base, and the base is provided with an installation position;

the main shaft part is rotatably arranged on the base around a first axis of the main shaft part, a first end of the main shaft part is positioned in the installation position, the cross section of the first end of the main shaft part is in a circular arrangement, and the tension chain unit is fixedly connected with a second end of the main shaft part;

a damping mechanism disposed within the mounting location, the damping mechanism including a damping arm and an elastic fastener, the damping arm comprises a connecting rod and a brake block, the first end of the connecting rod is rotatably connected with the brake block around a first hinge axis, the second end of the connecting rod is rotatably connected with the base around a second hinge axis, the first hinge axis and the second hinge axis are both parallel to the first axis and are along the axial projection of the main shaft part, a first line is formed between the projection of the second hinge axis and the projection of the first axis, a second line is formed between the projection of the second hinge axis and the projection of the first hinge axis, an included angle between the first connecting line and the second connecting line is an acute angle, and the elastic fastener drives the brake block to abut against the outer peripheral wall of the first end of the main shaft element;

the number of the damping arms is two to eight, and more than two groups of the damping arms are distributed along the circumferential direction of the main shaft element;

the elastic fasteners are arranged on more than two brake blocks, or

The number of the elastic fasteners is two to eight, and one elastic fastener is connected between the inner peripheral wall of the mounting position and one brake block.

2. The rear derailleur according to claim 1, wherein:

when the elastic fastening piece is installed on more than two brake shoes, a first clamping groove is formed in each brake shoe and is arranged along the circumferential direction of the main shaft piece and penetrates through the brake shoe, an opening of the first clamping groove faces away from the main shaft piece, the elastic fastening piece is a clamp spring, the clamp springs are clamped in the first clamping grooves of the brake shoes, and the brake shoes are abutted to the first end of the main shaft piece in a pulling mode.

3. The rear derailleur according to claim 1 or 2, wherein:

the base comprises a body and a ring body, wherein the body is provided with a mounting groove, the ring body is fixedly mounted in the mounting groove, the ring body is provided with the mounting position, and the second end of the connecting rod is hinged with the ring body;

the main shaft part is including being coaxial axis body and the axle cap that sets up, the axis body is rotationally installed around the second axis of self on the body, the first end of axis body with axle cap detachably connects, the axle cap is located in the installation position, the transversal circular setting of personally submitting of axle cap, the brake block with the periphery wall butt of axle cap.

4. The rear derailleur according to claim 3, wherein:

the body is further provided with a second clamping groove in the circumferential direction of the mounting groove, the second clamping groove is communicated with the mounting groove, a convex block is arranged on the outer circumferential wall of the ring body, and the convex block is clamped in the second clamping groove;

the shaft body is connected with the shaft cap key.

5. Bicycle, including the rear derailleur, its characterized in that:

the rear derailleur is as claimed in any one of claims 1 to 4.

6. The bicycle of claim 5, wherein:

the number of the damping arms is three or four.