CN214397089U

CN214397089U - Fluted disc and transmission system

Info

Publication number: CN214397089U
Application number: CN202022752552.1U
Authority: CN
Inventors: 吴瑞章
Original assignee: Guimeng Chain Shenzhen Co ltd
Current assignee: Guimeng Chain Shenzhen Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-10-15
Anticipated expiration: 2030-11-18

Abstract

A fluted disc and a transmission system, the transmission system comprises two fluted discs and a chain, the chain comprises a plurality of chain rollers, and an engagement space is formed between every two chain rollers. At least one fluted disc comprises a plurality of tooth-shaped structures, each tooth-shaped structure forms an arc surface meshed with the circumference of the chain, a driving surface extending outwards from the arc surface, a slip surface back to the driving surface and an addendum surface connecting the driving surface and the slip surface, a connecting line between the centers of two adjacent arc surfaces is defined as a pitch diameter, the included angle between the slip surface and the pitch diameter is 45-55 degrees, the arc surface is provided with a section point, a starting point connected with the driving surface and a connecting point positioned on a connecting line connecting the center of the arc surface and the center of the fluted disc, and a first arc length from the starting point to the connecting point is greater than a second arc length from the section point to the connecting point, so that the meshing stability can be improved.

Description

Fluted disc and transmission system

Technical Field

The present invention relates to a transmission system, and more particularly to a fluted disc and a transmission system for a bicycle or a motorcycle.

Background

Referring to fig. 6, a conventional transmission system 4 for a bicycle or a motorcycle generally includes two toothed plates 41 (only a portion of which is enlarged) spaced apart from each other in a front-rear direction and having a plurality of teeth 411 formed on the periphery thereof, and a chain 42 (only a portion of which is enlarged) surrounding the teeth 411 engaged with the toothed plates 41. The chain 42 includes a plurality of chain rollers 421, and an engaging space 422 into which the corresponding latch 411 is inserted is formed between each two chain rollers 421.

Each of the latch teeth 411 includes a tooth bottom portion 412 in a circular arc shape, and a tooth portion 413 connected to the tooth bottom portion 412 and protruding radially outward. The tooth bottom region 412 and the tooth nose region 413 cooperate to have a circular arc surface 414 that engages the sprocket 421, a drive surface 415 extending from the circular arc surface 414 toward the tooth nose region 413, a slip surface 416 opposite the drive surface 415, and a tooth top surface 417 that engages the drive surface 415 and the slip surface 416. The arc surface 414 is divided into two semi-arc surfaces by taking a central connecting line L connecting a circle center O1 of the arc surface 414 and a circle center O2 of the fluted disc 41 as a center. The slip surface 416 is mirror-symmetrical to the drive surface 415.

During transmission, due to the change of the rotation angle of the fluted disc 41, the chain roller 421 will gradually abut against the driving surface 415 and the engaged arc surface 414, and during the loading process, the sliding engagement phenomenon is formed between the arc surface 414 and the driving surface 415, so that the loading force is dispersed and less concentrated, and thus it is necessary to improve the operation.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a toothed disc that overcomes at least one of the disadvantages of the prior art.

The utility model discloses a fluted disc, be applicable to the meshing and drive a chain, this chain includes a plurality of chain rolls, every two this chain rolls form an engagement space, this fluted disc rotates along a direction of drive, and contain a plurality of profile of tooth structures, each this profile of tooth structure includes a tooth bottom region that can supply this chain roll embedding corresponding to put, and a protruding tooth region that radially outwards stretches out and can stretch into this engagement space corresponding, this tooth bottom region and this protruding tooth region cooperate and form an arc surface that meshes with this chain roll circumference, a drive face that extends towards this protruding tooth region by this arc surface, a slip-off face that extends to this drive face and slope back to, and a top surface that links up this drive face and this slip-off face, define the line between the centre of a circle of two adjacent this arc surfaces to be a pitch diameter, theta between this slip-off face and this pitch diameter is 45 ~ 55 degrees, this slip-off face has a section, an initial point far away from this section and connect this drive face, and a connecting point located on a connecting line of the center of the circular arc surface and the center of the fluted disc, wherein a first arc length from the starting point to the connecting point is greater than a second arc length from the cut-off point to the connecting point.

Further, the convex portion of each of the outer waist sections has a wide inner side surface facing the outer engagement space and penetrating in a direction away from the other opposite outer waist section, and the concave portion has a narrow inner side surface facing the outer engagement space and protruding in a direction toward the other opposite outer waist section.

Furthermore, the included angle theta between the slip-off surface and the pitch diameter is 48-54 degrees.

Further, the arc length of the arc surface accounts for 27-35% of the total circumference of the arc surface.

Further, the diameter of the arc surface is not smaller than that of the chain roller.

Furthermore, the slip surface is an inclined straight surface which is inclined and extends from the tooth top surface inwards and gradually towards the arc surface of the other tooth-shaped structure.

Furthermore, the driving surface is provided with a limit convex part which is connected with the starting point of the arc surface and is bulged towards the transmission direction.

Further, a transmission system comprising: two fluted discs which are arranged at intervals in the front and back, and at least one of the fluted discs is the fluted disc of the utility model; and the chain is in a closed loop shape and is engaged among the gear discs in a surrounding way, the chain comprises a plurality of chain rollers which are arranged at intervals along a length direction, a plurality of chain sheets which are arranged on two opposite sides of the chain rollers in a staggered way, and a plurality of chain shafts which respectively penetrate through the chain rollers and are connected with the chain sheets, and an engaging space is formed between every two chain rollers.

Furthermore, this fluted disc that is located the place ahead is the fluted disc, this slip face of this fluted disc is along this transmission direction slope, and this driving surface position that just follows this transmission direction each this profile of tooth structure is in the place ahead of this slip face.

Furthermore, this fluted disc that is located the rear is the fluted disc, this slip face of this fluted disc is followed this transmission direction slope, and is located the rear of this slip face along this drive direction this driving face of each this profile of tooth structure.

It is an object of the present invention to provide a transmission system that overcomes at least one of the disadvantages of the prior art.

The utility model discloses transmission system contains two fluted discs, and a chain. The toothed discs are spaced apart one from the other, at least one of the toothed discs being as described above. The chain is in a closed loop shape and is engaged among the gear discs in a surrounding manner, the chain comprises a plurality of chain rollers which are arranged at intervals along a length direction, a plurality of chain sheets which are arranged on two opposite sides of the chain rollers in a staggered manner, and a plurality of chain shafts which respectively penetrate through the chain rollers and are connected with the chain sheets, and an engaging space is formed between every two chain rollers.

The utility model has the advantages that: by the shape design of the tooth-shaped structure, the stability of meshing can be improved, the friction loss generated between the tooth-shaped structure and the chain roller can be reduced, the maximum force transmission can be realized with the minimum energy loss, the weight can be reduced, and the transmission efficiency can be improved.

Drawings

Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic side view of an embodiment of the transmission system of the present invention;

FIG. 2 is a fragmentary exploded perspective view of the embodiment;

FIG. 3 is a fragmentary side elevational view, partly in section, of the embodiment illustrating a chain engaged with a chainring;

FIG. 4 is a fragmentary side view in partial cross-section of the embodiment illustrating the chain about to engage the chainring;

FIG. 5 is a fragmentary side view in partial cross-section of the embodiment illustrating the chain about to disengage from the chainring; and

fig. 6 is a fragmentary side elevational view, partially in section, of a prior art chain illustrating a chain engaged with a chainring.

Detailed Description

Referring to fig. 1, 2 and 3, an embodiment of the transmission system of the present invention includes two toothed discs 1 disposed at a front-rear interval and rotating along a transmission direction 10, respectively, and a chain 2 in a closed loop shape and engaged between the toothed discs 1. The chain 2 is engaged with the toothed disc 1 and driven to move back and forth along a length direction 20, and includes a plurality of chain rollers 21 arranged at intervals along the length direction 20, a plurality of chain pieces 22 arranged in two rows in a staggered manner and respectively disposed at opposite sides of the chain rollers 21, and a plurality of chain shafts 23 respectively passing through the chain rollers 21 and connecting the chain pieces 22, and an engaging space 24 is formed between every two chain rollers 21, since the structure of the chain 2 is not the key point of the present invention, and the form and the number of components can be changed, it is not limited to this embodiment.

The fluted disc 1 includes a plurality of tooth-shaped structures 3 formed at the periphery at equal intervals, the number of the tooth-shaped structures 3 of the fluted disc 1 can be increased or decreased according to the requirement, generally speaking, the fluted disc 1 located in front is a driving wheel, the fluted disc 1 located in rear is a driven wheel, and at least one fluted disc 1 in the fluted disc 1 is provided with the improved tooth-shaped structure 3 of the present invention, which is described by taking the fluted disc 1 located in front as an example in this embodiment, but the present invention is not limited thereto, and can even be configured on a plurality of variable-speed fluted discs.

As will be further described with respect to the tooth-like structures 3, each tooth-like structure 3 includes a tooth bottom region 31 for receiving the corresponding chain roller 21, and a tooth convex region 32 protruding radially outward and extending into the corresponding meshing space 24. The tooth bottom area 31 and the convex tooth area 32 cooperate to form an arc surface 33 which is positioned in the tooth bottom area 31 and is engaged with the periphery of the chain roller 21, a driving surface 34 which extends from the arc surface 33 towards the convex tooth area 32, a slip surface 35 which is back to the driving surface 34 and is connected with the arc surface 33 of another adjacent tooth-shaped structure 3, and an tooth crest 36 which is positioned at the outer end and is engaged with the driving surface 34 and the slip surface 35.

The arc length of the arc surface 33 accounts for 27-35% of the total circumference of the whole circle of the arc surface 33, the diameter of the arc surface 33 is not smaller than that of the chain roller 21, the contact rate can be increased, and the arc surface 33 can be assuredly and stably meshed with the circumference of the chain roller 21. The arc surface 33 has a stopping point 331 connected to the slipping surface 35 of the adjacent tooth structure 3, a starting point 332 far from the stopping point 331 and connected to the driving surface 34, and a connecting point 333 located on a connecting line L connecting a center O1 of the arc surface 33 and a center O2 of the tooth disk 1, wherein a first arc length S1 from the starting point 332 to the connecting point 333 is greater than a second arc length S2 from the stopping point 331 to the connecting point 333. And a connecting line between the centers O1 of two adjacent circular arc surfaces 33 is defined as a pitch diameter P.

The driving surface 34 has a limiting protrusion 341 which is connected to the starting point 332 of the circular arc surface 33 and protrudes toward the transmission direction 10. The slipping surface 35 is an inclined straight surface, and extends from the tooth crest 36 inward to the adjacent arc surface 33 of another tooth-shaped structure 3, and gradually inclines in a direction away from the driving surface 34, an included angle θ between the slipping surface 35 and the pitch diameter P is 45 ° to 55 °, preferably, an included angle θ between the slipping surface 35 and the pitch diameter P is 48 ° to 54 °, and by the inclination design of the slipping surface 35, the arc length of the arc surface 33 is reduced and is smaller than that of the conventional arc surface 414 (see fig. 6), and the second arc length S2 is smaller than the first arc length S1 and is relatively smaller than half of the arc length of the conventional arc surface 414 (see fig. 6), so that the weight can be reduced.

It should be noted that, in design, the inclination directions of the slip-off surface 35 of the front toothed disc 1 and the rear toothed disc 1 are opposite to each other, wherein the slip-off surface 35 of the front toothed disc 1 is inclined along the transmission direction 10, that is, the driving surface 34 of each tooth-shaped structure 3 is located in front of the slip-off surface 35 along the transmission direction 10, and the slip-off surface 35 of the rear toothed disc 1 is inclined against the transmission direction 10, that is, the driving surface 34 of each tooth-shaped structure 3 is located behind the slip-off surface 35 along the transmission direction 10, so that the slip of the chain 2 at the rear portion of the meshing area can be avoided, and the tension maintenance of the chain 2 can be facilitated, and thus the maximum force transmission efficiency can be achieved with the minimum energy loss.

In use, the fluted disc 1 rotates along the transmission direction 10 to engage and drive the chain 2 to move, and as shown in fig. 4, when the convex tooth area 32 of each tooth-shaped structure 3 correspondingly extends into the corresponding engagement space 24, the limiting convex portion 341 first contacts the chain roller 21, and then drives the chain roller 21 to engage with the arc surface 33 to gradually complete engagement. By the design of the limit convex part 341, the chain roller 21 can be contacted in one step and the chain roller 21 is guided to the arc surface 33 during engagement, so that the impact and running-in at the initial stage of engagement with the chain roller 21 can be effectively shortened, the friction and noise can be reduced, the service life can be prolonged, the chain roller 21 can be engaged with the chain roller 21 more stably during transmission after engagement is completed, the chain roller 21 is kept engaged in the arc surface 33, the chain roller 21 can not slide between the driving surface 34 and the arc surface 33 due to the change of the rotation angle of the fluted disc 1, the carrying force is concentrated, the power is rapidly transmitted, the maximum power transmission can be achieved with the minimum energy loss, and the labor-saving transmission efficiency can be effectively achieved.

As shown in fig. 5, when the chain roller 21 is about to separate from the corresponding tooth-shaped structure 3, the chain roller 21 gradually leaves the arc surface 33, then leaves the driving surface 34, and finally completely separates from the tooth region 32, in this process, compared with the conventional tooth region 413 (shown by an imaginary line) with a symmetrical shape, the present invention can not only form a larger space for the chain roller 21 to smoothly slide away, but also save materials to achieve the function of light weight by the inclined design of the sliding surface 35.

To sum up, the utility model discloses fluted disc and transmission system mainly is the improvement fluted disc 1 the shape of profile of tooth structure 3 can let when carrying the dynamic arc surface 33 with chain rolls 21 and meshes firmly, promotes the stability of meshing, ensures good reliable transmission efficiency, moreover the oblique cutting design of slip surface 35 can also lighten weight, more can increase transmission efficiency, so can reach the purpose of the cost utility model really.

However, the above embodiments are only examples of the present invention, and the scope of the present invention should not be limited thereto, and all the simple equivalent changes and modifications made according to the claims and the contents of the patent specification are still included in the scope of the present invention.

Claims

1. A kind of fluted disc, suitable for engaging and driving a chain, this chain includes several chain rollers, every two this chain rollers form a engaging space, characterized by that, this fluted disc rotates along a drive direction, and include several tooth-shaped structures, every tooth-shaped structure includes a tooth bottom area for the corresponding chain roller to inlay, and a protruding tooth area that radially protrudes outwards and can stretch into the corresponding engaging space, this tooth bottom area and this protruding tooth area cooperate and form a circular arc surface engaging with the circumference of this chain roller, a drive surface extending towards this protruding tooth area from this circular arc surface, a slip-off surface extending obliquely opposite to this drive surface, and a tooth top surface joining this drive surface and slip-off surface, define the line of continuity between the centre of a circle of two adjacent circular arc surfaces is a pitch diameter, the included angle theta between slip-off surface and this pitch diameter is 45 ~ 55 degrees, this circular arc surface has a dead point, a section, The starting point is far away from the cut-off point and connected with the driving surface, and the connecting point is positioned on a connecting line of the center of the circular arc surface and the center of the fluted disc, and a first arc length from the starting point to the connecting point is greater than a second arc length from the cut-off point to the connecting point.

2. The toothed disc of claim 1, wherein the angle θ between the slip surface and the pitch diameter is 48 ° to 54 °.

3. The chainring of claim 1, wherein the arcuate surface has an arc length that is between 27 and 35 percent of a total circumference of the arcuate surface.

4. The chainring of claim 1, wherein the arcuate surface has a diameter that is not less than a diameter of the chainring.

5. The apparatus of claim 1, wherein the slip surface is a straight inclined surface extending from the top surface of the tooth toward the arc surface of the other tooth structure.

6. The chainring of claim 1, wherein the driving surface has a limiting protrusion protruding toward the driving direction and connected to the starting point of the circular arc surface.

7. A transmission system, comprising:

two spaced apart discs, at least one of said discs being the disc of claim 1; and

the chain is in a closed loop shape and is engaged among the fluted discs in a surrounding mode, the chain comprises a plurality of chain rollers which are arranged at intervals along a length direction, a plurality of chain sheets which are arranged on two opposite sides of the chain rollers in a staggered mode, and a plurality of chain shafts which penetrate through the chain rollers and are connected with the chain sheets respectively, and an engaging space is formed between every two chain rollers.

8. The transmission system according to claim 7, wherein the front toothed disc is the toothed disc of claim 1, the slip surface of the toothed disc is inclined along the transmission direction, and the driving surface of each of the tooth-shaped structures is located in front of the slip surface along the transmission direction.

9. The transmission system according to claim 7, wherein the rear toothed disc is the toothed disc of claim 1, the slip surface of the toothed disc is inclined against the transmission direction, and the driving surface of each of the toothed structures is located behind the slip surface along the transmission direction.