TWI615321B - Multiple sprocket assembly of a bicycle - Google Patents

Abstract

The invention discloses a bicycle toothed disc set, which comprises a plurality of toothed discs having different sizes; each of the toothed discs has a plurality of teeth, each of the teeth having a front tooth surface for facing an adjacent smaller size. a supporting member comprising a plurality of connecting members, each of the connecting members for connecting the respective toothed disks; wherein the connecting member is a unitary structure in which a plurality of stepped portions are connected in series, the stepped portion having a first stepped surface And a second step surface, the first step surface and the second step surface are coupled to a ring surface portion of the toothed disc; the first step surface has an offset from the front tooth mask, and the offset is greater than or equal to the The thickness of the teeth; the thickness between two adjacent first step faces is a first-order block thickness, the block thickness is a substantial thickness, and the block thickness is substantially greater than the thickness of the teeth. Thereby, the sprocket set has the advantages of light weight structure, high structural strength and greater torque transmission.

Description

Bicycle gear set

The present invention relates to the technical field of bicycles, and more particularly to a set of sprocket wheels for bicycles applied to the rear wheels.

In the prior art, the rear wheel of the bicycle is provided with a set of chainrings consisting of a plurality of differently sized toothed discs. The outer edge of each toothed disc is a toothed portion. The teeth of each of the teeth are alternately engaged with the chain when the shifting mechanism is activated. In the demand for cycling, a lighter structure and greater structural strength are always required for all components on the bicycle. Lightweight materials can be used to make lightweight toothed disc sets, while lightweight materials are typically low in hardness and low in structural strength.

U.S. Patent No. 4,642,075 is incorporated herein by reference. The smaller of the two gears and the larger one are connected through the bridge. The concept shown provides a low cost solution for a multi-sprocket with a large difference in the number of teeth.

U.S. Patent No. 7,118,505 discloses an integrally formed gear set. The adjacent sprocket wheels are combined by a plurality of connecting pieces. Since the connecting piece is in the form of a sheet, the structure of the gear set is significantly poor.

A multi-sprocket disclosed in U.S. Patent No. 8,342,994. The multi-sprocket wheel is integrally formed from a plurality of different sizes of toothed discs. In particular, the teeth of the toothed disc are combined with a disc-shaped portion, and the thickness of the disc-shaped portion is smaller than the thickness of the tooth. Although the structure of the prior patent can achieve a lightweight effect, it is likely to cause an effect of poor structural strength.

It is an object of the present invention to provide a bicycle chainring that enables a toothed disk pack to have a lightweight construction.

It is an object of the present invention to provide a bicycle chainring that is capable of providing a toothed disk set with high structural strength and greater torque transmission.

In order to achieve the above objects and effects, the present invention discloses a bicycle toothed disk set comprising a plurality of toothed disks having different sizes, and a toothed disk spacing between adjacent two toothed disks; each of the toothed disks has a plurality of teeth, each of the teeth having a front flank for facing an adjacent smaller sized sprocket; a support member comprising a plurality of connecting members, each of the connecting members being adjacent to each of the sprocket; The connecting member is a unitary structure in which a plurality of stepped portions are connected in series, the stepped portion has a first stepped surface and a second stepped surface, and the first stepped surface and the second stepped surface are coupled to the toothed disc a ring face; the first step face has an offset from the front tooth mask, the offset is greater than or equal to the thickness of the tooth; the thickness between the adjacent two first step faces is a first block thickness, The thickness of the step is a substantial thickness, and the thickness of the step is substantially greater than the thickness of the tooth.

Each of the spurs, the support member, each of the connecting rods, and the combination of the connecting members are unitary single members.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, the preferred embodiments of the present invention will be described in detail with reference to the drawings.

10‧‧‧Tear plate group

12‧‧‧ toothed disc

13‧‧‧ Ring face

14‧‧‧ tooth spacing

16‧‧‧ teeth

18‧‧‧ front tooth surface

20‧‧‧Support components

22‧‧‧ shaft tube

24‧‧‧ Rings

26‧‧‧ Connecting rod

28‧‧‧Connecting components

30‧‧‧ step

32‧‧‧ first stage

34‧‧‧second stage

40‧‧‧Offset

Fig. 1 is an external view of a toothed disc set of the present invention.

Fig. 2 is a cross-sectional external view of the toothed disc set of the present invention.

Fig. 3 is a schematic sectional view showing the structure of the toothed disc set of the present invention.

Figure 4 is a schematic view showing the structure of the adjacent two-toothed disc and the connecting member of the present invention.

Referring to Figure 1, a toothed disc set 10 of a bicycle is disclosed. The chainring 10 is disposed on the rear wheel of the bicycle and incorporates a rear hub. The chainring 10 is used to engage a chain (not shown) and transmit torque.

The chainring 10 has a plurality of spurs 12. Each of the spurs 12 has a different size. Each of the spurs 12 is arranged in a size from large to small, and a tooth-tooth spacing 14 is provided between two adjacent spurs 12. Second, each of the spurs 12 has a plurality of teeth 16 at its outer edge.

Referring to FIGS. 2 and 3, each of the spurs 12 has a ring-shaped surface portion 13 which is inclined and has an annular structure. Both opposite side surfaces of the ring surface portion 13 may be formed in an inclined shape. Each of the teeth 16 has a front flank 18 for facing an adjacent (next) smaller sized toothed disc 12.

A support member 20 includes a shaft tube 22, a ring member 24, a plurality of connecting rods 26, and a plurality of connecting members 28. Each of the connecting members 28 is for connecting the ring surface portion 13 of each of the spurs 12. The shaft tube 22 and the ring member 24 are formed at a central position of the combination of the respective toothed discs 12. The shaft tube 22 and the ring member 24 are coupled to the respective toothed discs 12. One end of each of the connecting rods 26 is connected to the ring member 24, and the other end is connected to each of the connecting members 28.

According to the members and combinations disclosed above, the combination of each of the spurs 12, the support member 20, each of the connecting rods 26, and each of the connecting members 28 is formed as a unitary unitary member.

Referring to FIG. 4, the connecting member 28 is an integral structure in which a plurality of stepped portions 30 are connected in series. Each of the step portions 30 is coupled to the ring surface portion 13 of the toothed disc 12. The step 30 has a first step 32. The first step surface 32 is coupled to the ring surface portion 13. The step portion 30 has a second Step 34. The second step surface 34 joins the ring face portion 13 and faces the sprocket pitch 14. It should be noted that the first step surface 32 is parallel with respect to the front tooth surface 18, and the first step surface 32 and the front tooth surface 18 have an offset 40 therebetween.

The magnitude of the offset 40 is defined as s, and the thickness of the tooth 16 is t. According to the structure disclosed in this embodiment, the offset 40 is greater than or equal to the thickness of the tooth 16 (ie, s≧t).

A first order block thickness d is also defined. The thickness d of the step is taken from the thickness between the two adjacent first step faces 32. The step thickness d of the step is an embodied substantial thickness. According to this embodiment, the thickness of the step is substantially greater than the thickness of the tooth 16, i.e., d > t in the drawing.

According to the above description, the present example has the following advantages: (1) since the sprocket set 10 is a single member, the structural strength is good; and (2) each of the connecting members 28 is apart from each other, so each of the connecting members 28 will have each of the teeth. The disc spacing 14 is divided into a plurality of hollow structures, such that the toothed disc set 10 forms a lightweight member; (3) the annular portion 13 having an inclination, the offset 40 is greater than the thickness of the tooth 16, and the step The block thickness is substantially greater than the thickness of the teeth 16 such that each of the teeth 16 has a high structural strength so that the set of sprocket wheels 10 can transmit greater torque.

The above embodiments are merely illustrative of the technology of the present invention and its effects, and are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the technical spirit and spirit of the present invention. Therefore, the scope of protection of the present invention should be as listed in the patent application scope mentioned later. .

12‧‧‧ toothed disc

13‧‧‧ Ring face

14‧‧‧ tooth spacing

16‧‧‧ teeth

18‧‧‧ front tooth surface

28‧‧‧Connecting components

30‧‧‧ step

32‧‧‧ first stage

34‧‧‧second stage

40‧‧‧Offset

Claims (3)

A bicycle toothed disk set for engaging a chain and transmitting torque, comprising: a plurality of toothed disks, each of the toothed disks having different sizes, each of the toothed disks being arranged in a size from large to small, and two adjacent ones There is a toothed disc spacing between the toothed discs; each outer edge of the toothed disc has a plurality of teeth, each of the teeth having a front tooth face for facing an adjacent smaller size of the toothed disc, each of the teeth The disk has a ring-shaped surface portion; a supporting member includes a plurality of connecting members, a shaft tube and a ring member, wherein each of the connecting members is adjacent to and is connected to each of the toothed disks, and the shaft tube is formed with the ring member a central position of the combination of the respective toothed discs, wherein the shaft tube and the ring member are combined with the respective toothed discs; wherein the connecting member is an integral structure in which a plurality of stepped portions are connected in series, the stepped portion having a first order And a second step surface, the first step surface and the second step surface are coupled to the ring surface portion of the toothed disc; the first step surface has an offset from the front tooth mask, and the offset is greater than or Equal to the thickness of the tooth; the thickness between two adjacent first step faces is a first-order block thickness, The thickness of substantial thickness based block, and the block order based substantial thickness greater than a thickness of the tooth; each of the connecting members with each of the toothed disc of the support element, the axis of the tubular member and the ring assembly is formed integrally of a single member. The bicycle chain gear set according to claim 1, wherein the support member comprises a plurality of connecting rods, one end of each connecting rod is connected to the ring member, and the other end is connected to each connecting member. The bicycle chain gear set of claim 1, wherein the second step of the step joins the ring face and faces the toothed disc pitch.