CN216102634U

CN216102634U - Fixing structure for rear speed changer and chain shifting device

Info

Publication number: CN216102634U
Application number: CN202122587202.9U
Authority: CN
Inventors: 段汉卿
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-03-22
Anticipated expiration: 2031-10-26

Abstract

The utility model discloses a fixing structure for a rear speed changer and a chain shifting device, wherein the fixing structure for the rear speed changer comprises a main shaft, a shifting table part and a fastening structure; the fastening structure comprises an end cap, a first locking piece and a second locking piece, wherein a step structure is arranged on the periphery of the end cap, the end cap is sleeved on the main shaft, the shifting table part is sleeved on the end cap, and the main shaft and the shifting table part are respectively abutted against two sides of the step structure; first retaining member pegs graft on the end cap in order to connect end cap and main shaft, and the overhanging part in the end cap is cup jointed in order to lock end cap and dial platform portion to the second retaining member. A derailleur apparatus for a rear derailleur includes a rear derailleur and a fixing structure for the rear derailleur. The contact area between main shaft and the back of dialling has effectively been increased through setting up of end cap, has increased main shaft, end cap and the inseparable degree of contact between the back of dialling the three, has effectively reduced the probability that the displacement appears between main shaft and the back of dialling, has solved the current problem that the displacement appears in the use of dialling after.

Description

Fixing structure for rear speed changer and chain shifting device

Technical Field

The utility model belongs to the technical field of rear shifting, and particularly relates to a fixing structure for a rear transmission and a chain shifting device.

Background

The speed-changing bicycle is a racing bicycle, the wheels are thin and narrow, and the purpose is to reduce the weight of the bicycle body to the maximum extent, so that the riding is light and convenient and the riding speed is high. The bicycle speed changing system has the function of changing the speed of a bicycle by changing the matching of a chain and gear discs with different front and rear sizes. The size of the front fluted disc and the size of the rear fluted disc determine the force of the bicycle when the pedals are rotated. The bigger the front fluted disc is, the smaller the rear fluted disc is, and the harder the pedal feels when pedaling. The smaller the front fluted disc is, and the larger the rear fluted disc is, the easier the pedals feel. According to the abilities of different drivers, the speed of the bicycle can be adjusted by adjusting the sizes of the front fluted disc and the rear fluted disc, or different road sections and road conditions can be met.

The rear speed variator is an important component of a variable speed bicycle and comprises a flywheel, a rear dial and a chain, and the position of the chain on the flywheel sheet is adjusted through the rear dial, so that the speed of the bicycle is adjusted. The existing rear speed changer has the structural defect that when the existing rear speed changer is connected with a main shaft, a flywheel is sleeved on the main shaft, a rear dial is tightly pressed on the main shaft through a nut, but the nut and the rear dial are in clearance fit substantially, in the actual use process, the rear dial can generate certain displacement, the displacement is larger in the speed regulation process, the flywheel and the rear dial are located on different planes, and the difficulty in speed change is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fixing structure for a rear derailleur and a derailleur device, which solve the problem that the conventional rear derailleur is displaced in the using process.

In order to achieve the purpose, the utility model adopts the following technical scheme:

in one aspect, the present invention provides a fixing structure for a rear derailleur, including a main shaft, a dial plate portion fixed to one end of the main shaft, and a fastening structure fixing the dial plate portion to the main shaft;

the fastening structure comprises an end cap, a first locking piece and a second locking piece, wherein a step structure is arranged on the periphery of the end cap, the end cap is sleeved on the main shaft, the shifting table part is sleeved on the end cap, and the main shaft and the shifting table part are respectively abutted against two sides of the step structure;

first retaining member pegs graft on the end cap in order to connect end cap and main shaft, and the overhanging part in the end cap is cup jointed in order to lock end cap and dial platform portion to the second retaining member.

Optionally, a first locking hole and an abutting groove are arranged in the end cap, wherein the first locking hole comprises a first hole section, a conical surface section and a second hole section which are connected in sequence, the diameter of the first hole section is larger than that of the second hole section, and the second hole section is communicated with the abutting groove;

correspondingly, when the end cap is sleeved on the main shaft, the main shaft is inserted in the abutting groove, and the end part of the main shaft abuts against the bottom surface of the abutting groove.

Alternatively, the step structure is provided as at least one annular step, and the outer periphery of the overhang portion is provided with a first thread.

Optionally, the main shaft is sleeved with a step shaft, and when the end cap is sleeved on the main shaft, the step shaft abuts against the step structure.

Optionally, the second locking member includes a barrel portion and a cover portion fixed to one end of the barrel portion, wherein a second thread adapted to the first thread is disposed on the inner side of the barrel portion, and a second locking hole is disposed on the cover portion.

Optionally, the first locking member is provided as a locking bolt.

In another aspect, the present invention provides a derailleur apparatus for a rear derailleur comprising a rear derailleur and said fixing structure for the rear derailleur, the fixing structure for the rear derailleur comprising a dial portion;

the dial part is arranged on the rear dial and is integrally formed with the rear dial, a stepped hole suitable for the end cap is formed in the dial part, and when the dial part is sleeved on the end cap, the stepped structure is abutted against the stepped hole;

the rear dial also comprises two to six guide wheel structures, and each guide wheel structure comprises a guide wheel arm sleeved on the end cap and a guide wheel rotatably arranged on the guide wheel arm.

Optionally, a tower footing is further arranged on the main shaft, wherein the tower footing is sleeved on the step shaft;

when the end cap is sleeved on the main shaft, the step shaft is abutted to the step structure, the tower base is sleeved with the flywheel, and the flywheel is connected to the guide wheel through the chain.

Has the advantages that:

this a fixed knot constructs and dial chain device for back derailleur has effectively increased the area of contact between main shaft and the group platform portion through setting up of end cap in, has increased the inseparable degree of contact between main shaft, end cap and the group platform portion three, has effectively reduced the probability that the displacement appears between main shaft and the group platform portion, has solved that the nut is fixed to lead to between main shaft and the group platform portion clearance fit's problem. Meanwhile, the fastening structure is more attractive in appearance and contributes to improving the market competitiveness. The sag of the poking platform part is better, and the accuracy of speed change is better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a fixing structure and a derailleur device for a rear derailleur.

FIG. 2 is a side elevational view of the fixing structure for the rear derailleur and the derailleur device in accordance with the present invention.

Fig. 3 is a schematic sectional view of the section a-a in fig. 2.

FIG. 4 is an exploded schematic view of the fixing structure and derailleur device for the rear derailleur.

Fig. 5 is a schematic cross-sectional view of an end cap.

Fig. 6 is a sectional view schematically showing the second locker.

In the figure:

1. a main shaft; 2. a dial-up part; 3. a fastening structure; 31. an end cap; 32. a first locking member; 33. a second locking member; 321. a barrel portion; 322. a lid portion; 301. a step structure; 302. a first thread; 303. a first locking block; 304. a butt joint groove; 305. a second thread; 306. a second locking hole; 4. a step shaft; 5. a tower footing; 6. post dialing; 61. a guide wheel structure; 601. A stepped bore.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.

As shown in fig. 1 to 6, a fixing structure for a rear derailleur includes a main shaft 1, a dial part 2 fixed to one end of the main shaft 1, and a fastening structure 3 fixing the dial part 2 to the main shaft 1; the fastening structure 3 comprises an end cap 31, a first locking member 32 and a second locking member 33, wherein a step structure 301 is arranged on the periphery of the end cap 31, the end cap 31 is sleeved on the main shaft 1, the dial part 2 is sleeved on the end cap 31, and the main shaft 1 and the dial part 2 are respectively abutted against two sides of the step structure 301; the first locking member 32 is inserted into the end cap 31 to connect the end cap 31 and the spindle 1, and the second locking member 33 is inserted into the protruding portion of the end cap 31 to lock the end cap 31 and the dial portion 2.

When the rear derailleur device is installed, the end cap 31 is fixed on the main shaft 1 through the first locking piece 32, the dial part 2 is sleeved on the end cap 31, and the dial part 2 is locked through the second locking piece 33. When the speed is regulated, the displacement of the contact part of the shifting table part 2 and the end cap 31 is small, the regulation of the shifting table part 2 on the chain is not influenced, and the effectiveness of the speed regulation is ensured.

This derailleur is dialled chain among the device through setting up of end cap 31 and has effectively increased the area of contact between main shaft 1 and the platform portion 2, has increased the inseparable degree of contact between main shaft 1, end cap 31 and the platform portion 2 three, has effectively reduced the probability that the displacement appears between main shaft 1 and the platform portion 2, has solved the fixed main shaft 1 that leads to of prior art nut and has dialled the problem that is clearance fit between platform portion 2. Meanwhile, the fastening structure 3 is more attractive in appearance and contributes to improving the market competitiveness. The sag of the dial part 2 is better, and the accuracy of speed change is better.

In this embodiment, referring to fig. 5, a first locking hole and an abutting groove 304 are provided in the end cap 31, wherein the first locking hole includes a first hole section, a conical section and a second hole section that are connected in sequence, the diameter of the first hole section is larger than that of the second hole section, and the second hole section is communicated with the abutting groove 304; correspondingly, when the end cap 31 is sleeved on the spindle 1, the spindle 1 is inserted into the abutting groove 304, and the end of the spindle 1 abuts against the bottom surface of the abutting groove 304.

The diameter of the second bore section is matched to the size of the first locking member 32 and the tapered section effectively increases the contact area between the end cap 31 and the first locking member 32, both of which effectively increase the tightness of the connection. The large diameter of the first hole section increases the range of motion of the first securing member 32, facilitating the insertion of the first securing member 32 into the end cap 31.

In the present embodiment, the step structure 301 is provided with at least one annular step, and it is easy to understand that the number of the annular steps is increased or decreased according to the actual use condition. And the end cap 31 is integrally formed with the annular step to improve the force-bearing capacity of the structure.

In this embodiment, the outer periphery of the overhang portion is provided with a first thread 302. The second locking member 33 is connected to the end cap 31 by means of a threaded connection, and the structure is simple and compact, which is beneficial to reducing the volume.

In the embodiment, the spindle 1 is sleeved with the step shaft 4, and when the end cap 31 is sleeved on the spindle 1, the step shaft 4 abuts against the step structure 301. The step shaft 4 separates the main shaft 1 from the tower footing 5, reduces abrasion to the main shaft 1 in the rotation process of the tower footing 5, and prolongs the service life of the main shaft 1.

In this embodiment, referring to fig. 6, the second locking member 33 includes a cylindrical body 321 and a cover 322 fixed to one end of the cylindrical body 321, wherein the cylindrical body 321 has a second thread 305 adapted to the first thread 302 on the inner side thereof, and the cover 322 has a second locking hole 306 thereon. When the first locking member 32 is installed, the first locking member 32 passes through the second locking hole 306 into the barrel portion 321, and is inserted into the first locking hole, so as to connect the spindle 1 and the end cap 31 together.

Optionally, the first locking member 32 connects the main shaft 1 and the end cap 31 by means of screw fitting, interference fit, pin connection, etc., in this embodiment, the first locking member 32 is configured as a locking bolt, and the first locking member 32 connects the main shaft 1 and the end cap 31 by means of screw connection.

In addition, the present embodiment also includes a derailleur apparatus for a rear derailleur including a rear derailleur 6 and the fixing structure for a rear derailleur described above, which includes a dial portion 2.

The dial platform part 2 is arranged on the rear dial 6 and is integrally formed with the rear dial 6, a stepped hole 601 suitable for the end cap 31 is formed in the dial platform part 2, and when the dial platform part 2 is sleeved on the end cap 31, the stepped structure 301 is abutted against the stepped hole 601; the stepped holes 601 are matched with the stepped structure 301 in terms of number, diameter, thickness and other parameters, and will not be described herein.

Rear dial 6 includes two to six guide wheel structures 61, and guide wheel structure 61 sets up the guide pulley on the guide pulley arm including cup jointing the guide pulley arm on end cap 31 with rotating. In the existing rear derailleur, two guide wheels are generally arranged, and the rear derailleur device reduces the displacement of a rear derailleur 6 through the arrangement of a fastening structure 3, so that more guide wheel structures 61 can be arranged, more transmission ratios are provided, and the speed regulation is more refined. It is well known that the structure and the speed change principle of the guide wheel structure 61 are common knowledge in the art, and will not be described herein.

In this embodiment, the main shaft 1 is further provided with a tower footing 5, wherein the tower footing 5 is sleeved on the step shaft 4; when the end cap 31 is sleeved on the main shaft 1, the step shaft 4 abuts against the step structure 301, the tower footing 5 is sleeved with the flywheel, and the flywheel is connected to the guide wheel through a chain. It is well known that the structure of the tower footing 5 and the matching manner of the tower footing 5 and the flywheel are common knowledge in the art, and will not be described herein.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixing structure for a rear derailleur is characterized by comprising a main shaft (1), a dial part (2) fixed at one end of the main shaft (1) and a fastening structure (3) for fixing the dial part (2) on the main shaft (1);

the fastening structure (3) comprises an end cap (31), a first locking piece (32) and a second locking piece (33), wherein a step structure (301) is arranged on the periphery of the end cap (31), the end cap (31) is sleeved on the main shaft (1), the shifting table part (2) is sleeved on the end cap (31), and the main shaft (1) and the shifting table part (2) are respectively abutted to two sides of the step structure (301);

the first locking piece (32) is inserted into the end cap (31) to connect the end cap (31) with the main shaft (1), and the second locking piece (33) is sleeved on the outward extending part of the end cap (31) to lock the end cap (31) and the dial part (2).

2. The fixing structure for a rear derailleur according to claim 1, wherein a first locking hole and an abutting groove (304) are provided in the end cap (31), wherein the first locking hole includes a first hole section, a tapered section and a second hole section which are connected in sequence, a diameter of the first hole section is larger than a diameter of the second hole section, and the second hole section communicates with the abutting groove (304);

correspondingly, when the end cap (31) is sleeved on the main shaft (1), the main shaft (1) is inserted into the abutting groove (304), and the end part of the main shaft (1) abuts against the bottom surface of the abutting groove (304).

3. The fixing structure for a rear derailleur according to claim 1, characterized in that the step structure (301) is provided as at least one annular step, the outer periphery of the overhanging portion being provided with a first thread (302).

4. The fixing structure for the rear derailleur according to claim 3, characterized in that the spindle (1) is sleeved with a step shaft (4), and when the end cap (31) is sleeved on the spindle (1), the step shaft (4) abuts against the step structure (301).

5. The fixing structure for a rear derailleur according to claim 3, wherein the second locker (33) includes a cylinder (321) and a cover (322) fixed to one end of the cylinder (321), wherein the cylinder (321) is provided at an inner side thereof with a second thread (305) adapted to the first thread (302), and the cover (322) is provided with a second locking hole (306).

6. The fixing structure for a rear derailleur according to claim 1, characterized in that the first locking member (32) is provided as a locking bolt.

7. A derailleur device for a rear derailleur, characterized in that it comprises a rear derailleur (6) and a fixing structure for a rear derailleur according to any one of claims 1 to 6, the fixing structure for the rear derailleur comprising a dial portion (2);

the poking platform part (2) is arranged on the rear poking part (6) and is integrally formed with the rear poking part (6), a stepped hole (601) suitable for the end cap (31) is formed in the poking platform part (2), and when the poking platform part (2) is sleeved on the end cap (31), the stepped structure (301) is abutted to the stepped hole (601);

the rear dial (6) further comprises two to six guide wheel structures (61), and the guide wheel structures (61) comprise guide wheel arms sleeved on the end caps (31) and guide wheels rotatably arranged on the guide wheel arms.

8. The derailleur device for a rear derailleur according to claim 7, wherein the main shaft (1) is further provided with a tower base (5), wherein the tower base (5) is sleeved on the step shaft (4);

when the end cap (31) is sleeved on the main shaft (1), the step shaft (4) is abutted against the step structure (301), the tower base (5) is sleeved with the flywheel, and the flywheel is connected to the guide wheel through a chain.