TWM661099U - Bicycle gear locking structure - Google Patents

Abstract

A locking structure for a bicycle gear disc comprises: a first disc body, wherein the first through hole and a positioning groove are respectively provided on the two axial sides thereof; the first through hole is connected to the positioning groove; the bottom of the positioning groove has a first positioning surface; a second disc body, disposed on one side of the first disc body; the second disc body has a second through hole corresponding to the first through hole of the first disc body; and at least one locking member, which is detachable The locking member is connected to the first disk and the second disk in a manner; the locking member has a second positioning surface corresponding to the first positioning surface of the positioning groove; wherein the locking member passes through the positioning groove and the first through hole of the first disk, and the second through hole of the second disk until the second positioning surface of the locking member abuts against the first positioning surface of the positioning groove, thereby fastening the first disk and the second disk to each other.

Description

Bicycle gear locking structure

This creation is related to bicycle gears, and in particular refers to a locking structure of bicycle gears that improves the fixing strength between gears.

In order to allow riders to adjust the transmission efficiency of the bicycle according to different riding conditions, most bicycles are equipped with flywheels and derailleurs. The flywheel is a structure formed by a combination of gears of different sizes. The common sprocket-type derailleur can drive the chain to move to different gears by changing its position. Due to the different sizes of the gears, the transmission ratio of the front and rear gears will change, causing the pedaling weight to change, thereby achieving the effect of speed change. Common combinations include a front derailleur system with a front flywheel and a front derailleur; a rear derailleur system with a rear flywheel and a rear derailleur; or a multi-speed system with front and rear flywheels and front and rear derailleurs at the same time.

Among them, in order to make the chain move smoothly between the gears, the fixing structure between the gears is very important. There are several known ways to fix the gears. One is to fix several gears by welding. The advantage of this fixing method is that the fixing strength is strong, but the disadvantage is that once the gears are welded, they cannot be easily replaced and the flexibility is poor. On the other hand, there is also a structure that locks several gears together by rivets or screws. The advantage of this fixing method is that the screws can be removed to easily replace the gears, but the structural strength of the larger gears is insufficient, which causes the gears to vibrate easily when the chain moves between the larger gears, affecting the smoothness of the shifting. Therefore, how to provide a locking structure for bicycle gears that can maintain the removability while improving its fixing strength on the larger gears is one of the issues that the bicycle industry and researchers need to solve urgently.

The main purpose of this invention is to provide a locking structure for bicycle gears, which can improve the fixing strength between larger gears while maintaining the removability.

To achieve the above-mentioned creative purpose, the invention discloses a locking structure of a bicycle gear disc, comprising: a first disc body, having a first through hole and a positioning groove on its axial two sides respectively; the first through hole is connected to the positioning groove; the bottom of the positioning groove has a first positioning surface; a second disc body, arranged on one side of the first disc body; the second disc body has a second through hole corresponding to the first through hole of the first disc body; and at least one locking The fastener is detachably connected to the first disk and the second disk; the fastener has a second positioning surface corresponding to the first positioning surface of the positioning groove; wherein the fastener passes through the positioning groove and the first through hole of the first disk, and the second through hole of the second disk until the second positioning surface of the fastener abuts against the first positioning surface of the positioning groove, thereby fastening the first disk and the second disk to each other.

In one embodiment, the first positioning surface of the first disk has a plurality of ratchet grooves; the second positioning surface of the locking member has a plurality of ratchets corresponding to the ratchet grooves of the first positioning surface; when the second positioning surface abuts against the first positioning surface, the ratchets extend into the ratchet grooves.

In one embodiment, the locking member has a head and a body connected to each other, the outer diameter of the head is larger than the outer diameter of the body; the second positioning surface is formed on a side of the head adjacent to the body.

In one embodiment, the first disk has a first inner ring portion, a plurality of first connecting portions and a first outer ring portion; the first inner ring portion is located radially inward of the first outer ring portion; the first connecting portions are located between the first inner ring portion and the first outer ring portion, and the two ends are respectively connected to the first inner ring portion and the first outer ring portion; the first through hole and the positioning groove are formed on one of the first connecting portions and respectively penetrate the axial sides of the first connecting portion.

In one embodiment, the first disk is a gear disk, and the outer peripheral surface of the first outer ring portion has a plurality of first outer ring teeth.

In one embodiment, a third disk is further included, which is disposed on one side of the second disk away from the first disk; the third disk has a third through hole corresponding to the second through hole of the second disk; the locking member passes through the first through hole of the first disk, the second through hole of the second disk and the third through hole of the third disk until the second positioning surface abuts against the first positioning surface of the first disk, thereby fastening the first disk, the second disk and the third disk to each other.

In one embodiment, the third through hole has an internal thread; one end of the locking member away from the second positioning surface has an external thread; when the locking member passes through the third through hole, the external thread engages with the internal thread.

In one embodiment, a fourth disk is further included, which is disposed between the second disk and the third disk, so that the second disk and the third disk are separated from each other; the fourth disk has a through hole corresponding to the second through hole of the second disk and the third through hole of the third disk; the locking member passes through the first through hole of the first disk, the second through hole of the second disk, the through hole of the fourth disk and the third through hole of the third disk until the second positioning surface abuts against the first positioning surface of the first disk, thereby fastening the first disk, the second disk and the third disk to each other.

In one embodiment, the outer diameter of the through hole of the fourth disk is larger than the outer diameters of the second through hole and the third through hole.

In one embodiment, the second disk and the third disk are each a gear disk, and the fourth disk is a gasket.

The following is a list of preferred implementation examples based on the purpose and efficacy of this invention, and is described in detail with accompanying diagrams.

1: Gear assembly

11: First inner ring

12: First connection part

13: First outer ring

130: First outer ring tooth

14: First through hole

15: Positioning slot

150: First positioning surface

151: ratchet groove

21: Second inner ring

22: Second connection part

23: Second Outer Ring

230: Second outer ring tooth

24: Second through hole

31: The third inner ring

32: Third connection part

33: The third outer ring

330: Third outer ring tooth

34: The third through hole

340: Internal thread

41: The fourth inner ring

42: Fourth connection part

43: Fourth Outer Ring

44: Through hole

50: Lock firmware

51: Head

510: Second positioning surface

511: Thorns

52: Body

520: External thread

S1: First plate

S2: Second disk

S3: The third disk

S4: The fourth disk

Figure 1 is a three-dimensional diagram of the gear assembly of one of the preferred embodiments of this invention.

Figure 2 is a partial exploded view of the gear assembly of one of the preferred embodiments of this invention.

Figure 3 is a partial enlarged schematic diagram of a preferred embodiment of the present invention, showing the structure of the gear plate and the locking device.

Figure 4 is a cross-sectional view of a gear assembly of a preferred embodiment of the present invention.

Figure 5 is a partial enlargement of Figure 4.

The following descriptions with reference to the various figures are preferred embodiments of this invention. It should be understood that the figures and descriptions are for illustrative purposes only and are not intended to limit this invention. In addition, the terms "upper" and "lower", "left" and "right", "front" and "back", "first" and "second" described in the manual are used to clearly explain the relative positions between components or mechanisms and are not intended to be limiting.

Please refer to FIG. 1, a preferred embodiment of the present invention provides a locking structure of a bicycle gear, which mainly includes a gear set 1. The gear set 1 is used to be installed on a bicycle (not shown) and engaged with a chain (not shown). In this embodiment, the gear set 1 is a rear gear set, which is installed on a rear wheel hub of the bicycle (not shown). In another embodiment, the gear set can be a front gear set, which is installed on a crank of the bicycle. The gear set 1 at least includes a first disc body S1, a second disc body S2 and a third disc body S3.

Next, please refer to Figure 2 and Figure 3. The first disk S1 includes a first inner ring portion 11, a plurality of first connecting portions 12 and a first outer ring portion 13. The first inner ring portion 11 is located radially inward of the first outer ring portion 13. The first connecting portions 12 are formed between the first inner ring portion 11 and the first outer ring portion 13, and the two ends are connected to the first inner ring portion 11 and the first outer ring portion 13 respectively. In this embodiment, the first disk S1 is a gear disk, and the outer circumference of the first outer ring portion 13 has a plurality of first outer ring teeth 130 for the chain to engage. In another embodiment, the first disk can be a spider.

The first disk S1 has a plurality of first through holes 14, which are formed on the first connecting parts 12. Each of the first through holes 14 is formed on a side of the first connecting part 12 adjacent to the second disk S2 and penetrates in a direction away from the second disk S2. The first disk S1 further has a plurality of positioning grooves 15, which are formed on the first connecting parts 12. Each of the positioning grooves 15 is formed on a side of the first connecting part 12 away from the second disk S2 and penetrates in a direction close to the second disk S2. The first through hole 14 is connected to the positioning groove 15, and the inner diameter of the positioning groove 15 is larger than the inner diameter of the first through hole 14. The bottom of the positioning groove 15 has a first positioning surface 150, and a plurality of ratchet grooves 151 arranged approximately radially are formed on the first positioning surface 150. In this embodiment, the ratchet groove 151 is a long elliptical groove.

The second disc S2 is disposed on one side of the first disc S1, and its outer diameter is smaller than that of the first disc S1. The second disc S2 includes a second inner ring portion 21, a plurality of second connecting portions 22, and a second outer ring portion 23. The second inner ring portion 21 is located radially inward of the second outer ring portion 23. The second connecting portions 22 are formed between the second inner ring portion 21 and the second outer ring portion 23, and the two ends are connected to the second inner ring portion 21 and the second outer ring portion 23 respectively. In this embodiment, the second disc S2 is a gear disc, and the outer circumference of the second outer ring portion 23 has a plurality of second outer ring teeth 230 for the chain to engage. The number of the second outer ring teeth 230 is less than the number of the first outer ring teeth 130. In another embodiment, the second disk may be a spider.

The second disk S2 has a plurality of second through holes 24, which are formed on the second connecting parts 22 and penetrate the axial sides of the second connecting parts 22. The positions of the second through holes 24 correspond to the positions of the first through holes 14 of the first disk S1.

The third disc S3 is disposed on one side of the second disc S2 away from the first disc S1, and its outer diameter is smaller than that of the second disc S2. The third disc S3 includes a third inner ring portion 31, a plurality of third connecting portions 32 and a third outer ring portion 33. The third inner ring portion 31 is located radially inward of the third outer ring portion 33. The third connecting portions 32 are formed between the third inner ring portion 31 and the third outer ring portion 33, and both ends are connected to the third inner ring portion 31 and the third outer ring portion 33 respectively. In this embodiment, the third disk S3 is a gear disk, and the outer peripheral surface of the third outer ring portion 33 has a plurality of third outer ring teeth 330 for the chain to engage. The number of the third outer ring teeth 330 is less than the number of the second outer ring teeth 230. In another embodiment, the third disk can be a spider.

The third disk S3 has a plurality of third through holes 34, which are formed on the third connecting parts 32 and penetrate the axial sides of the third connecting parts 32. The positions of the third through holes 34 correspond to the positions of the first through holes 14 of the first disk S1 and the second through holes 24 of the second disk S2. The inner wall surface of the third through hole 34 is formed with an internal thread 340.

The gear assembly 1 further includes a fourth disc S4, which is disposed between the second disc S2 and the third disc S3, so that the second disc S2 and the third disc S3 are separated from each other. The fourth disc S4 has a fourth inner ring portion 41, a plurality of fourth connecting portions 42 and a fourth outer ring portion 43. The fourth inner ring portion 41 is located radially inward of the fourth outer ring portion 43. The fourth connecting portions 42 are formed between the fourth inner ring portion 41 and the fourth outer ring portion 43, and the two ends are connected to the fourth inner ring portion 41 and the fourth outer ring portion 43 respectively. The outer diameter of the fourth disc S4 is smaller than the outer diameters of the second disc S2 and the third disc S3. In this embodiment, the fourth disk S4 is a spider.

The fourth disk S4 further has a plurality of through holes 44, which are formed on the fourth connecting portion 42 and penetrate the axial sides of the fourth connecting portion 42. The through holes 44 correspond to the second through holes 24 of the second disk S2 and the third through hole 34 of the third disk S3, respectively, and the inner diameter of the through hole 44 is larger than the inner diameter of the second through hole 24 and the third through hole 34.

As shown in FIGS. 2 to 3, a plurality of locking members 50 are detachably connected to the first disk S1, the second disk S2, the fourth disk S4 and the third disk S3, so that the first disk S1, the second disk S2, the fourth disk S4 and the third disk S3 are fastened to each other. The structures of the locking members 50 are the same, and only one of them is described in detail below. The locking member 50 has a head 51 and a body 52. The outer diameter of the head 51 is larger than the outer diameter of the body 52. The head 51 has a second positioning surface 510 on one side adjacent to the body 52. A plurality of ratchets 511 are formed on the second positioning surface 510. The ratchets 511 are arranged radially with the body 52 as the center, corresponding to the ratchets grooves 151 on the first positioning surface 150 of the first disk S1, and the ratchets 511 are inclined along a rotation direction. The body 52 extends in a direction away from the head 51, and the axial length of the body 52 is greater than the axial length of the head 51. The body 52 has an external thread 520 formed on the outer peripheral surface of one end away from the head 51.

According to the above structural configuration, the practical application of the present invention is as follows: please refer to Figures 4 and 5. When the first disk S1, the second disk S2, the fourth disk S4 and the third disk S3 are locked by the locking members 50, the body 52 of the locking member 50 passes through the positioning groove 15 and the first through hole 14 of the first disk S1, the second through hole 24 of the second disk S2, the through hole 44 of the fourth disk S4 and the third through hole 34 of the third disk S3 in sequence until the head 51 of the locking member 50 abuts against the first positioning surface 150 of the positioning groove 15 of the first disk S1. At this time, since the ratchets 511 on the second positioning surface 510 of the locking member 50 will extend into the ratchets grooves 151 on the first positioning surface 150 of the positioning groove 15 during the locking process, the locking member 50 is restricted to rotate only in the rotation direction and cannot rotate in the reverse direction. Therefore, the ratchets 511 of the locking member 50 and the ratchets grooves 151 of the first disk S1 can effectively enhance the fixing strength between the locking member 50 and the first disk S1. Furthermore, since the third through hole 34 of the third disk S3 has the internal thread 340, the end of the body 52 of the locking member 50 away from the head 51 has the external thread 520, and the engagement of the internal thread 340 and the external thread 520 can also strengthen the fixing strength of the locking member 50 and the third disk S3. Therefore, the locking structure at both ends of the locking member 50 can simultaneously prevent the first disk S1, the second disk S2, the fourth disk S4 and the third disk S3 from easily shifting along the axial direction.

It should be added that, although the present embodiment discloses that the locking members 50 simultaneously lock the first disk S1, the second disk S2, the fourth disk S4 and the third disk S3, the present invention is not limited to this state. In other embodiments, the locking members can lock only the first disk; only the first disk and the second disk; only the first disk, the second disk and the third disk; only the second disk and the fourth disk; or only the second disk, the fourth disk and the third disk according to needs. In other words, any related technology of locking the gear plate-gear plate, gear plate-fourth plate body, gear plate-fourth plate body-gear plate through the locking structure of this creation does not deviate from the application scope of this creation.

In summary, the locking structure of the bicycle gear provided by this invention can effectively improve the fixing strength between the locking piece and the gear through the technical characteristics of the corresponding ratchet structure of the locking piece and the ratchet groove structure on the gear, while retaining the detachability, solving the problem of insufficient structural strength of the conventional bicycle gear locking through screws.

The above are the preferred embodiments and design diagrams of this creation, but the preferred embodiments and design diagrams are only examples and are not used to limit the scope of rights of the art of this creation. Any implementation with equal technical means or within the scope of rights covered by the following "Scope of Patent Application" does not deviate from the scope of this creation and is the scope of rights of the applicant.

12: First connection part

14: First through hole

15: Positioning slot

150: First positioning surface

151: ratchet groove

50: Lock firmware

51: Head

510: Second positioning surface

511: Thorns

52: Body

520: External thread

Claims (10)

A locking structure for a bicycle gear disc comprises: a first disc body, wherein the first through hole and a positioning groove are respectively provided on the two axial sides thereof; the first through hole is connected to the positioning groove; the bottom of the positioning groove has a first positioning surface; a second disc body, disposed on one side of the first disc body; the second disc body has a second through hole corresponding to the first through hole of the first disc body; and at least one locking member, which is detachable The locking member is connected to the first disk and the second disk in a manner; the locking member has a second positioning surface corresponding to the first positioning surface of the positioning groove; wherein the locking member passes through the positioning groove and the first through hole of the first disk, and the second through hole of the second disk until the second positioning surface of the locking member abuts against the first positioning surface of the positioning groove, thereby fastening the first disk and the second disk to each other. The locking structure of the bicycle gear disc as described in claim 1, wherein the first positioning surface of the first disc body has a plurality of ratchet grooves; the second positioning surface of the locking member has a plurality of ratchets corresponding to the ratchet grooves of the first positioning surface; when the second positioning surface abuts against the first positioning surface, the ratchets extend into the ratchet grooves. The locking structure of the bicycle gear ring as described in claim 1, wherein the locking member has a head and a body connected to each other, the outer diameter of the head is larger than the outer diameter of the body; the second positioning surface is formed on one side of the head adjacent to the body. The locking structure of the bicycle gear disc as described in claim 1, wherein the first disc body has a first inner ring portion, a plurality of first connecting portions and a first outer ring portion; the first inner ring portion is located radially inward of the first outer ring portion; the first connecting portions are located between the first inner ring portion and the first outer ring portion, and the two ends are respectively connected to the first inner ring portion and the first outer ring portion; the first through hole and the positioning groove are formed on one of the first connecting portions and respectively penetrate the axial sides of the first connecting portion. The locking structure of the bicycle gear disc as described in claim 4, wherein the first disc body is a gear disc, and the outer peripheral surface of the first outer ring portion has a plurality of first outer ring teeth. The locking structure of the bicycle gear disc as described in claim 1 further comprises a third disc body, which is arranged on one side of the second disc body away from the first disc body; the third disc body has a third through hole corresponding to the second through hole of the second disc body; the locking member passes through the first through hole of the first disc body, the second through hole of the second disc body and the third through hole of the third disc body until the second positioning surface abuts against the first positioning surface of the first disc body, thereby fastening the first disc body, the second disc body and the third disc body to each other. The locking structure of the bicycle gear as described in claim 6, wherein the third through hole has an internal thread; the end of the locking piece away from the second positioning surface has an external thread; when the locking piece passes through the third through hole, the external thread engages with the internal thread. The locking structure of the bicycle gear disc as described in claim 6 further includes a fourth disc body, which is arranged between the second disc body and the third disc body, so that the second disc body and the third disc body are separated from each other; the fourth disc body has a through hole corresponding to the second through hole of the second disc body and the third through hole of the third disc body; the locking piece passes through the first through hole of the first disc body, the second through hole of the second disc body, the through hole of the fourth disc body and the third through hole of the third disc body until the second positioning surface abuts against the first positioning surface of the first disc body, thereby fastening the first disc body, the second disc body and the third disc body to each other. The locking structure of the bicycle gear disc as described in claim 8, wherein the outer diameter of the through hole of the fourth disc body is larger than the outer diameters of the second through hole and the third through hole. The locking structure of the bicycle gear as described in claim 8, wherein the second disc body and the third disc body are each a gear disc, and the fourth disc body is a gasket.

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