CN220743286U

CN220743286U - High-precision fluted disc with novel locking structure

Info

Publication number: CN220743286U
Application number: CN202322427739.8U
Authority: CN
Inventors: 高煜昇
Original assignee: Prowheel Vehicle Material Shanghai Co ltd
Current assignee: Prowheel Vehicle Material Shanghai Co ltd
Priority date: 2023-09-07
Filing date: 2023-09-07
Publication date: 2024-04-09
Anticipated expiration: 2033-09-07

Abstract

The utility model discloses a high-precision novel locking structure fluted disc which comprises a right crank, an outer tooth plate and an inner tooth plate, wherein a plurality of crank claws connected with the outer tooth plate and the inner tooth plate are arranged on the periphery of a first end of the right crank, a mounting hole connected with an axle center is formed in the first end of the right crank, a connecting convex part is arranged on one side of each crank claw facing the outer tooth plate and the inner tooth plate, a U-shaped clamping groove for placing the outer tooth plate is formed in one side of each connecting convex part, an extending groove for placing the inner tooth plate is formed in the other side of each connecting convex part, a crank split hole is formed in the middle of each connecting convex part, the crank split hole is of a through hole structure, an outer tooth plate mounting hole is formed in the outer tooth plate, an inner tooth plate mounting hole is formed in the inner tooth plate, and the outer tooth plate and the inner tooth plate are fixed on the crank claws through split locking screws matched with the outer tooth plate mounting hole, the inner tooth plate mounting hole and the crank split hole.

Description

High-precision fluted disc with novel locking structure

Technical Field

The utility model relates to the technical field of bicycle accessories, in particular to a high-precision novel locking structure fluted disc.

Background

Referring to fig. 1 to 4, when designing a locking structure of a conventional right crank 1 and a tooth plate, there are the following problems:

1. after the right crank 1 is assembled with the inner and outer tooth plates 2 and 3, the outer tooth plate 3 is placed on the front side a of the claw of the right crank 1, and the matching position of the outer tooth plate 3 and the right crank 1 has obvious step I, so that the matching position is limited, the whole appearance is not well designed when the product is designed, the claw part of the right crank 1 is short, and the appearance design is limited;

2. the split lock nuts pass through the inner tooth plate split lock hole 2a, the right crank split lock hole 1a and the outer tooth plate split lock hole 3a, so that the inner tooth plate split lock hole 2a, the right crank split lock hole 1a and the outer tooth plate split lock hole 3a can be assembled only by being designed to be larger in size in consideration of the machining precision of products, the inner tooth plate split lock hole 2a and the outer tooth plate split lock hole 2a can be dislocated in angle after being enlarged, and if the dislocated angle of the inner tooth plate 2 and the outer tooth plate 3 is too large, the functions of the products are affected, namely the lower chain point or the upper chain point of a winding chain are changed, so that the speed change function is affected;

3. when the inner and outer tooth plates 2, 3 are assembled with the right crank 1, 4 split locking screws and 4 split locking nuts are needed, the assembly is complex, and the cost is high.

Disclosure of Invention

The utility model aims to overcome the defects and shortcomings of the prior art and provide a high-precision novel locking structure fluted disc so as to solve the problems.

The technical problems solved by the utility model can be realized by adopting the following technical scheme:

the utility model provides a new locking structure fluted disc of high accuracy, includes right crank, external tooth piece and internal tooth piece, right crank's first end periphery be provided with a plurality of with the crank claw that external tooth piece and internal tooth piece are connected, its characterized in that, right crank's first end be provided with the mounting hole that is connected with the axle center, the crank claw towards one side of external tooth piece, internal tooth piece is provided with the connection convex part, the one side of connection convex part is provided with the confession the U type draw-in groove that external tooth piece placed, the another side of connection convex part is provided with the confession the extension groove that internal tooth piece placed, the middle part of connection convex part is provided with the crank and divides the lockhole to be the through-hole structure, be provided with external tooth piece mounting hole on the external tooth piece, be provided with internal tooth piece mounting hole on the internal tooth piece, internal tooth piece through with the branch lock screw of external tooth piece mounting hole, internal tooth piece mounting hole, crank minute lockhole complex is fixed on the crank claw.

In a preferred embodiment of the present utility model, a thread structure matched with the split locking screw is arranged in the outer gear plate mounting hole.

In a preferred embodiment of the present utility model, the internal tooth plate mounting hole is a through hole structure matched with a split locking screw.

In a preferred embodiment of the present utility model, the mounting hole is a blind hole structure.

Due to the adoption of the technical scheme, the utility model has the beneficial effects that: compared with the prior art, the crank claw can be designed in different shapes, the claw part of the crank claw is longer due to the fact that the step difference of the traditional structure is not provided, the whole effect is good, the assembling mode of the crank claw is compared with the traditional assembling mode, the use of the split locking nut is reduced, the assembling is simpler, the whole assembling cost is reduced besides the assembling is simpler, in addition, the swinging space of the inner tooth plate, the outer tooth plate and the right crank after assembling is smaller, the assembling precision is improved, and therefore the functions of a product are better ensured, namely the product is smoother in upper chain and lower chain.

Drawings

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

Fig. 1 is a schematic diagram of a prior art structure.

Fig. 2 is a schematic structural view of a right crank of the prior art.

Fig. 3 is a schematic structural view of a prior art external tooth plate.

Fig. 4 is a schematic structural view of an internal tooth plate of the prior art.

Fig. 5 is a schematic structural view of the present utility model.

Fig. 6 is a schematic front view of the right crank of the present utility model.

FIG. 7 is a schematic view of the reverse side structure of the right crank of the present utility model.

Fig. 8 is a schematic structural view of the external tooth plate of the present utility model.

Fig. 9 is a schematic structural view of the internal tooth plate of the present utility model.

Fig. 10 is a cross-sectional view of the present utility model.

Fig. 11 is an enlarged view of a portion a of fig. 10.

Fig. 12 is a schematic view of the overall structure of the present utility model connected to the left crank.

Detailed Description

The utility model is further described below in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.

Referring to fig. 5 to 12, a high-precision new locking structure fluted disc comprises a right crank 100, an external gear plate 200 and an internal gear plate 300, wherein the periphery of the first end of the right crank 100 is provided with a plurality of crank claws 120 connected with the external gear plate 200 and the internal gear plate 300, and the first end of the right crank 100 is provided with a mounting hole 110 connected with an axle center 10. The mounting holes 110 in this embodiment are preferably blind hole structures. The middle part of the right crank 100 is provided with the mounting hole 110 and adopts a blind hole structure, so that the corrosion of sand dust and rainwater can be avoided, and the service life of the fluted disc is prolonged.

The crank claw 120 is provided with a connection protrusion 130 on one side facing the external tooth plate 200 and the internal tooth plate 300, a U-shaped clamping groove 131 for placing the external tooth plate 200 is provided on one surface of the connection protrusion 130, and an extension groove 132 for placing the internal tooth plate 300 is provided on the other surface of the connection protrusion 130. Specifically, the U-shaped catching groove 131 is located between the connection protrusion 130 and the crank jaw 120, and the extension groove 132 is located at the outermost end of the crank jaw 120.

The middle part of the connecting protrusion 130 is provided with a crank locking hole 130a, the crank locking hole 130a is preferably a through hole structure, the external tooth plate 200 is provided with an external tooth plate mounting hole 200a, the internal tooth plate 300 is provided with an internal tooth plate mounting hole 300a, and the external tooth plate 200 and the internal tooth plate 300 are fixed on the crank claw 120 through the locking screw 1 matched with the external tooth plate mounting hole 200a, the internal tooth plate mounting hole 300a and the crank locking hole 130 a.

The external gear plate mounting hole 200a is provided therein with a thread structure engaged with the split lock screw 1. The split locking screw 1 passes through the crank split locking hole 130a to be matched with the outer gear plate mounting hole 200 with the tooth pattern structure and is fixed on the crank claw 120, so that the split locking screw is not matched with a nut any more, accessories are reduced in assembly, and the assembly precision requirement is not high.

The internal tooth plate mounting hole 300a has a through hole structure that mates with the split lock screw 1. So that the head of the split lock screw 1 can be bonded to the internal tooth plate 300, and the strength of the internal tooth plate 300 can be improved.

The assembly process of the utility model is as follows: the external tooth plate 200 is first sleeved into the U-shaped clamping groove 131, the internal tooth plate 300 is placed on the extending groove 132, the split locking screw 1 passes through the connecting convex part 130, the external tooth plate 200, the crank split locking hole 130a on the internal tooth plate 300, the external tooth plate mounting hole 200a and the internal tooth plate mounting hole 300a to be fixed on the crank claw 120, and the split locking screw 1 passes through the crank split locking hole 130a, the external tooth plate mounting hole 200a and the internal tooth plate mounting hole 300a to be fixed on the crank claw 120 due to the thread structure matched with the split locking screw 1 arranged on the external tooth plate mounting hole 200, and then the axle center 10 is mounted on the mounting hole 110 of the right crank 100, and finally is connected with the left crank 400 to form a whole.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a new locking structure fluted disc of high accuracy, includes right crank, external tooth piece and internal tooth piece, right crank's first end periphery be provided with a plurality of with the crank claw that external tooth piece and internal tooth piece are connected, its characterized in that, right crank's first end be provided with the mounting hole that is connected with the axle center, the crank claw towards one side of external tooth piece, internal tooth piece is provided with the connection convex part, the one side of connection convex part is provided with the confession the U type draw-in groove that external tooth piece placed, the another side of connection convex part is provided with the confession the extension groove that internal tooth piece placed, the middle part of connection convex part is provided with the crank and divides the lockhole to be the through-hole structure, be provided with external tooth piece mounting hole on the external tooth piece, be provided with internal tooth piece mounting hole on the internal tooth piece, internal tooth piece through with the branch lock screw of external tooth piece mounting hole, internal tooth piece mounting hole, crank minute lockhole complex is fixed on the crank claw.

2. The high-precision new locking structure fluted disc according to claim 1, wherein the external gear plate mounting hole is internally provided with a tooth pattern structure matched with a split locking screw.

3. The high-precision novel locking structure fluted disc according to claim 1, wherein the internal tooth plate mounting hole is of a through hole structure matched with a split locking screw.

4. The high-precision new locking structure fluted disc according to claim 1, wherein the mounting hole is of blind hole structure.