CN212386637U - Bicycle chain wheel - Google Patents

Abstract

A bicycle sprocket is provided with a plurality of sprockets surrounding an outer periphery of a body, and the plurality of sprockets include a first sprocket set and a second sprocket set. The sprockets of the first and second sprocket sets are alternately and adjacently disposed, and the sprocket thickness of the first sprocket set is greater than the sprocket thickness of the second sprocket set. At least one part of the chain teeth of the first chain tooth group comprises a first lug and a second lug, the first lug and the second lug are positioned at two opposite sides of the chain teeth, the first lug and the second convex part are staggered, and the first lug protrudes out of one side surface of the body; at least a part of the chain teeth of the second chain tooth group are deviated and close to one side surface of the body. Interference between the chain and the teeth of the sprocket can be reduced, and wear of the chain is reduced during repositioning of the chain.

Description

Bicycle chain wheel

Technical Field

The utility model relates to a drive system's of bicycle technical field especially indicates bicycle sprocket, and this sprocket is installed and is used for combining two crank pedal groups and meshing a chain at the frame.

Background

Bicycles are typically connected to a combination of a sprocket and a freewheel and hub by a chain, or to a combination of a plurality of sprockets and a freewheel and hub by a chain. In riding a bicycle equipped with a chain drive system, management of the engagement of the chain and the sprocket is particularly important to whether the bicycle can be safely and efficiently propelled. However, changing the ratio of the sprocket to the freewheel changes the position and the chain line of the chain, so that the chain changes position while also rubbing against the sprocket, thereby causing significant interference when the chain changes position.

US patent No. 9182027 discloses a sprocket having a plurality of teeth, and the plurality of teeth includes a first set of teeth and a second set of teeth, wherein the thickness of the first set of teeth is greater than the thickness of the second set of teeth, and the line connecting the tips of the first and second sets of teeth is offset from the centerline of the thickness of the sprocket.

Taiwan patent TW 201525329a discloses a sprocket having a plurality of teeth around the outer periphery of a disc. The plurality of convex teeth are composed of a plurality of first convex teeth, a plurality of second convex teeth and at least one odd number of third convex teeth, the number of the plurality of first convex teeth is even, the tooth surface of the first convex teeth is provided with a convex block, the upper edge of the convex block extends to the tooth end surface, the plurality of second convex teeth and the third convex teeth are arranged in a staggered mode with the plurality of first convex teeth, the number of the plurality of second convex teeth is odd, and the third convex teeth have shorter length; the structure is combined with a chain, so that the transmission is smoother and more reliable, and the occurrence of chain falling can be greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a bicycle sprocket, it has can and then reduce the interference between the chain tooth of chain and sprocket, and reduces the wearing and tearing of this chain at the process that this chain changes positions.

To achieve the above objects and advantages, the present invention provides a sprocket structure with a plurality of sprockets surrounding an outer periphery of a body. The body has a first side and a second side opposite to the first side, a part of the plurality of teeth is a first set of teeth, the other part of the plurality of teeth is a second set of teeth, the teeth of the first and second sets of teeth are alternately and adjacently arranged, and the thickness of the teeth of the first set of teeth is greater than the thickness of the teeth of the second set of teeth. Furthermore, at least a part of the sprockets of the first sprocket group comprise a first bump and a second bump, the first bump and the second bump are positioned at two opposite sides of the sprockets, the first bump and the second bump are staggered, and the first bump protrudes out of the first surface of the body; and at least a part of the chain teeth of the second chain tooth group deviate from the middle position of the first surface and the second surface of the body and are close to the first surface.

Preferably, the root of the first bump of the sprocket of the first sprocket group is an inclined part, and the inclined part is connected with the body.

Preferably, one side of the sprocket of the second sprocket group is inclined relative to the second surface of the body.

Preferably, each of the teeth of the second set of teeth is located between two of the teeth of the first set of teeth, and two sides of the teeth of the second set of teeth are opposite to two of the teeth of the first set of teeth, and one side of the teeth of the second set of teeth is an arc-shaped portion and the other side is a linear portion.

Preferably, the sprocket of the second sprocket set has a top portion, the curved portion is opposite to the linear portion, and one end of the curved portion is connected to the top portion, and the curved portion and the linear portion extend downward from an edge of the top portion.

Preferably, the height of the arc-shaped portion of the teeth of the second chain set is about 30% to 45% of the total height of the teeth, and the height of the linear portion is 30% to 45% of the total height of the teeth.

The utility model has the advantages that:

the utility model provides a bicycle sprocket, it has can and then reduce the interference between the chain tooth of chain and sprocket, and reduces the wearing and tearing of this chain at the process that this chain changes positions.

The following description will be made in detail with reference to the accompanying drawings, which illustrate preferred embodiments and structures of the present invention according to the purpose and effect of the present invention.

Drawings

FIG. 1 is a schematic view of a bicycle chain structure.

FIG. 2 is a schematic view of a combination of a bicycle sprocket, freewheel and chain.

Fig. 3 is an external view of an embodiment of the present invention.

Fig. 4 is a partial external view of an embodiment of the present invention.

Fig. 5 is a partial external view of a combination of a sprocket and a chain according to an embodiment of the present invention.

Fig. 6 is a partial external view of an embodiment of the present invention.

Fig. 7 is a schematic structural view of a thick sprocket according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of a thin sprocket according to an embodiment of the present invention.

Fig. 9 is a schematic top view of a thin sprocket according to an embodiment of the present invention.

Fig. 10 is a schematic structural view of a thin sprocket according to an embodiment of the present invention.

Fig. 11 is a schematic view of the engagement between the thick sprocket and the thin sprocket and the chain according to the embodiment of the present invention.

Fig. 12 is a schematic structural view of the thin sprocket relative to the chain displacement according to the embodiment of the present invention.

Detailed Description

Referring to FIG. 1, a bicycle chain 10 generally includes outer links 12 and inner links 14 that are each pivotally coupled by a pin 16. The outer links 12 are alternately interleaved with the inner links 14, and the width of the chain holes 13 of the outer links 12 is greater than the width of the chain holes 15 of the inner links 14.

Referring to fig. 2, a hub 20 and a freewheel 22 are assembled together and mounted at the center of a rear wheel 24, the chain 10 is used to connect the freewheel 22 with a sprocket 30, and the sprocket 30 is combined with two crank pedal sets 26. Stepping on the crank 26 rotates the sprocket 30 and the chain 10, and the rotating chain 10 drives the combination of the flywheel 22 and the hub 20 to rotate the rear wheel 24. It will be appreciated that as the chain 10 changes position, the angle of the strand of the chain 10 (the line of elongation of the chain) changes and the angle of inclination of the chain 10 increases the closer it is to the rear wheel 22.

Referring to fig. 3, the sprocket 30 of the present embodiment includes a body 32 and a plurality of teeth. One of the two opposite side surfaces of the body 32 is a first surface 34, and the other is a second surface 36. A plurality of teeth are disposed around the outer periphery of the body 32, and a portion of the teeth is a first set of teeth 42, another portion of the teeth is a second set of teeth 44, and the teeth 45 of the second set of teeth 44 are alternately and adjacently disposed with the teeth 43 of the first set of teeth 42.

Referring to fig. 4 and 5, the thickness of the sprocket 43 of the first sprocket set 42 is greater than the thickness of the sprocket 45 of the second sprocket set 44. The sprocket 30 engages the chain 10, the teeth 43 of the first set 42 of teeth engage the holes 13 of the outer link 12, and the teeth 45 of the second set 44 of teeth engage the holes 15 of the inner link 14.

Referring to fig. 6 and 7, at least a portion of the teeth 43 of the first set of teeth 42 of the present embodiment includes a first protrusion 431 and a second protrusion 432. Preferably, all of the teeth 43 of the first set 42 include a first protrusion 431 and a second protrusion 432.

The first protrusion 431 and the second protrusion 432 are located on opposite sides of the sprocket 43, and particularly, the first protrusion 431 and the second protrusion 432 are offset, and the first protrusion 431 protrudes from the first surface 34 of the body 32. Further, the root of the first protrusion 431 of the sprocket 44 of the first sprocket group 42 is a slanted portion 433, and the slanted portion 433 is connected to the body 32.

Referring to fig. 6 and 8, at least a portion of the teeth 45 of the second set of teeth 44 are offset from the middle of the first and second faces 34 and 36 of the body 32 and are close to the first face 34. Preferably all of the teeth 45 of the second set 44 are offset proximate the first face 34.

Referring to fig. 9, except that the sprocket 45 is offset from the middle of the first surface 34 and the second surface 36 of the body 32, one side 452 of the sprocket 45 is inclined relative to the second surface 36.

Referring to fig. 10, the sprocket 45 is disposed opposite to two sides of the adjacent two sprockets 43, one of the two sprockets has an arc portion 454, and the other has a linear portion 456, the arc portion 454 is opposite to the linear portion 456, and one end of the arc portion 454 is connected to a top portion 458 of the sprocket 45. The curved portion 454 and the linear portion 456 extend downward from the edge of the top portion 458. The high HC of the arcuate portion 454 is about 30% to 45% of the total high HT of the sprocket 45. Likewise, the height HL of the linear portion 456 is about 30% to 45% of the total height HT of the sprocket 45, but the height of the arcuate portion 454 is not uniform with the height of the linear portion 456.

Referring to fig. 11, the sprocket 30 is engaged with the chain 10, the thick sprocket 43 is inserted into the hole 13 of the outer link 12, and the thin sprocket 45 is inserted into the hole 15 of the inner link 14. Thereby improving the engagement effect of the sprocket 30 with the chain 10.

Referring to fig. 11 and 12, when the chain 10 changes position, particularly when the chain 10 moves from the flywheel sprocket to the chainring (not shown), the angle of inclination of the chain 10 increases, causing the outer side of the chain 10 (the side away from the frame) to be closer to the sprockets 43 and 45. Since the sprocket 45 is close to the first side 34 of the body 32 and one side 452 of the sprocket 45 is inclined relative to the second surface 36, a larger moving gap is formed between the chain 10 and the sprocket 45, so as to reduce the interference between the chain 10 and the sprocket 45 and reduce the wear of the chain 10 during the process of changing the position of the chain 10.

In other words, when the chain 10 is shifted to a larger flywheel, in addition to the fact that the link of the inner link 14 can be slipped into one side 452 of the sprocket 45 to have more space for movement, the link of the outer link 12 can also be slipped into the recess of the side of the second protrusion 432 of the sprocket 43, thereby achieving interference reduction. When the chain 10 changes toward a smaller flywheel, the chain pieces of the inner chain link 14 and the outer chain link 12 can respectively lean against a side surface of the sprocket 45 and the first protrusion 431 of the sprocket 43, so that the chain pieces of the outer chain link 12 and the inner chain link 14 are supported, and a function of stabilizing the chain stop is achieved.

The above description is the preferred embodiment of the present invention and the technical principle applied by the preferred embodiment, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes based on the equivalent transformation, simple replacement, etc. of the technical solution of the present invention all belong to the protection scope of the present invention.

Claims (6)

1. A bicycle sprocket for engaging a drive chain, comprising:

the body, its relative two side surfaces are a first surface and a second surface;

a plurality of sprockets surrounding the outer periphery of the body, wherein one part of the sprockets is a first sprocket group, the other part of the sprockets is a second sprocket group, the sprockets of the second sprocket group are alternately and adjacently arranged with the sprockets of the first sprocket group, and the thickness of the sprockets of the first sprocket group is larger than that of the sprockets of the second sprocket group;

wherein at least a part of the sprockets of the first sprocket group comprise a first bump and a second bump, the first bump and the second bump are positioned at two opposite sides of the sprockets, the first bump and the second bump are staggered, and the first bump protrudes out of the first surface of the body;

at least a part of the chain teeth of the second chain tooth group deviate from the middle position of the first surface and the second surface of the body and are close to the first surface.

2. The bicycle sprocket as in claim 1, wherein a root of the first projection of the tooth of the first set of teeth is an inclined portion, and the inclined portion is connected to the body.

3. The bicycle sprocket as in claim 1, wherein one side of the teeth of the second set of teeth is inclined with respect to the second face of the body.

4. The bicycle sprocket as in claim 1, wherein each of the teeth of the second set is located between two of the teeth of the first set, and the two sides of the teeth of the second set are opposite to two of the teeth of the first set, and one side of the teeth of the second set is an arc portion and the other side is a linear portion.

5. The bicycle sprocket as in claim 4, wherein the teeth of the second set of teeth have a top portion, the arcuate portion being opposite the linear portion and having one end connected to the top portion, the arcuate portion and the linear portion extending downwardly from an edge of the top portion.

6. The bicycle sprocket as in claim 5, wherein the height of the arcuate portion of the teeth of the second set is about 30% to 45% of the total height of the teeth, and the height of the linear portion is about 30% to 45% of the total height of the teeth.

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