Crescent chain

Abstract

The utility model discloses a crescent-shaped chain which comprises a plurality of inner chain links, a plurality of outer chain pieces and pin shafts, the inner chain links are sequentially connected end to end through the outer chain pieces, the inner chain links and the outer chain pieces are rotationally connected through the pin shafts, each inner chain link comprises two inner chain pieces, and the inner chain pieces and the outer chain pieces are of crescent-shaped structures. The two ends of the hinge parts are connected with the pin shafts, the waist part is arranged between the two hinge parts and plays a role in connection, two through holes for the pin shafts to be inserted are formed in each hinge part, one side of each waist part is concavely arranged to form an arc-shaped structure, and the other side of each waist part is arranged to be of a linear structure. And the connecting parts of the hinging part and the arc-shaped structure and the linear structure are arranged in an arc-shaped transition manner. Due to the crescent structures of the inner chain pieces and the outer chain pieces, the friction resistance of the chain in the using process can be reduced, the noise of the chain can be reduced, the risk that the chain is abraded and broken can be reduced, the performance and durability of the chain are improved, and the requirement of a high-speed electric power-assisted bicycle can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle chains, and more specifically to a crescent-shaped chain. Background Art

[0002] Chains are widely used in people's daily life, such as bicycle chains, transmission chains of automation equipment, etc. Chain transmission is a transmission method that transmits the movement and power of a driving sprocket with a toothed structure to another driven sprocket with a toothed structure through a chain. As people's pursuit of high-speed chains is getting higher and higher, the thickness of the inner and outer chain plates of the chain no longer meets the requirements of high-speed systems. Traditional bicycle chains, such as a chain and inner chain plates disclosed in utility model patent publication number CN206513767U, include several inner chain plates, several outer chain plates, and several chain shafts that connect the inner chain plates and the outer chain plates in series and have a central axis respectively. Most chains on the market are 8-shaped chains disclosed in the above patent. In the current high-speed development stage of electric power-assisted driving, the 8-shaped chain is easy to cause the friction and wear between the chain and the tooth plate to increase, which may produce a large noise and cannot meet the speed requirements of the current high-speed electric power-assisted bicycles. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and provide a crescent-shaped chain that can significantly improve the performance and durability of the chain and adapt to the needs of high-speed electric-assisted bicycles.

[0004] To achieve the above-mentioned purpose, the utility model provides a crescent-shaped chain, including a plurality of inner chain links, a plurality of outer chain plates, and a pin shaft, wherein the inner chain links are connected end to end in sequence through the outer chain plates, and the inner chain links and the outer chain plates are rotatably connected through the pin shaft, each inner chain link includes two inner chain plates, and the two inner chain plates are symmetrically arranged, and the inner chain plates and the outer chain plates are both arranged in a crescent-shaped structure, and the inner chain plates and the outer chain plates each include a hinged portion connected to the pin shaft at both ends and a waist portion that serves as a connection between the two hinged portions, and the hinged portion is provided with two through holes for inserting the pin shaft, one side of the waist is concave inwardly to form an arc structure, and the other side of the waist is arranged in a linear structure, and the connection parts between the hinged portion and the arc structure and the linear structure are all arranged in an arc-shaped transition.

[0005] Preferably, the inner side wall edges of the inner link plates are all provided with chamfered structures.

[0006] Preferably, a concave structure located at the edge of the through hole is provided on the hinged portion of the inner side wall of the inner link plate.

[0007] Preferably, the edges of the waist portion on the inner side wall of the outer link are respectively provided with guide slopes corresponding to their shapes.

[0008] Preferably, the shape of the hinged portion is circular or elliptical.

[0009] Preferably, the outer chain plates are arranged bilaterally symmetrically and are rotatably connected between two adjacent inner chain links via a pin.

[0010] Preferably, a pin shaft sleeve is further included, and the pin shaft sleeve is respectively vertically connected between the hinge parts on each two inner link plates that are symmetrically arranged on the left and right, and is sleeved on the outer side wall of each pin shaft.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model has a simple and novel structure and a reasonable design. The inner and outer chain plates are both arranged in a crescent-shaped structure, which can reduce the friction resistance of the chain during use, and also reduce the noise of the chain, thereby improving riding comfort. In addition, the crescent-shaped structure is similar to the arc of the tooth profile of the chainplate of the electric power-assisted bicycle on the market. The combination of the two can accurately achieve the engagement between the chainplate and the chain, thereby reducing the risk of chain wear and breakage. The utility model significantly improves the performance and durability of the chain and can meet the needs of high-speed electric power-assisted bicycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a front view structural schematic diagram of a crescent-shaped chain provided by an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the inner chain plate structure of a crescent-shaped chain provided by an embodiment of the utility model;

[0016] Figure 3 This is a schematic diagram of the outer link structure of a crescent-shaped chain provided by an embodiment of the utility model;

[0017] Figure 4 It is a schematic diagram of the top view of a crescent-shaped chain provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Please refer to Figure 1 The embodiment of the utility model provides a crescent-shaped chain, including a plurality of inner chain links 1, a plurality of outer chain plates 2, a pin shaft 3 and other components. The various components of this embodiment are described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, the inner chain links 1 can be connected end to end in sequence through the outer chain plates 2, and the inner chain links 1 and the outer chain plates 2 are rotatably connected through the pin shaft 3. Each inner chain link 1 includes two inner chain plates 11, and the two inner chain plates 11 are symmetrically arranged.

[0021] In this embodiment, the inner link plate 11 and the outer link plate 2 can be set to a crescent-shaped structure. The inner link plate 11 and the outer link plate 2 both include a hinge portion 10 connected to the pin shaft 3 at both ends and a waist 20 that connects the two hinge portions 10. Two through holes 101 for inserting the pin shaft 3 are provided on the hinge portion 10. One side of the waist 20 is concave inward to form an arc structure 201, and the other side of the waist 20 is set to a linear structure 202. The connection parts of the hinge portion 10 and the arc structure 201 and the linear structure 202 are all set in an arc transition.

[0022] Among them, when the inner link plate 11 and the outer link plate 2 of the crescent-shaped structure are combined and connected into a crescent-shaped chain, they have a positioning effect on the installation direction, which can reduce the friction resistance of the crescent-shaped chain during use, and also reduce the noise of the chain and improve the riding comfort.

[0023] Furthermore, the shape of the hinge 10 can be set to be circular or elliptical. In addition, the crescent-shaped structure formed by the hinge 10 and the waist 20 is similar to the arc of the tooth plate of the electric power-assisted bicycle on the market. The combination of the two can accurately achieve the meshing between the tooth plate and the chain, reducing the risk of chain wear and breakage.

[0024] like Figure 2 As shown, in order to prevent wear between the inner link plate 11 and the gear teeth of the electric power-assisted bicycle, the inner side wall edges of the inner link plate 11 can be provided with a chamfered structure 111 .

[0025] Specifically, a concave structure 112 located at the edge of the through hole 101 may be provided on the hinge portion 10 of the inner side wall of the inner link piece 11 .

[0026] like Figure 3 As shown, in order to prevent wear between the inner surface of the outer link 2 and the edge of the inner link plate 11 of the inner link 1, the edge of the waist 20 on the inner side wall of the outer link 2 can be provided with a guide slope 21 corresponding to its shape.

[0027] In this embodiment, compared with the thickness of the traditional chain, the crescent-shaped structure of the inner link plate 11 and the outer link plate 2 constituting the crescent-shaped chain reduces the thickness thereof while still not affecting the tensile strength of the chain. The tensile strength of the chain can also be increased, which is more conducive to speed change operations at high speeds. In response to the current market demand for high-speed classification systems for electric power-assisted bicycles, the crescent-shaped chain design is more suitable for the use of high-power motors and high-speed electric power-assisted bicycles, and is suitable for use in mid-mounted motor-assisted bicycles with a power of more than 1000 watts.

[0028] like Figure 4 As shown, the outer chain plates 2 are respectively arranged in a bilaterally symmetrical manner and are rotatably connected between two adjacent inner chain links 1 through a pin shaft 3 .

[0029] Preferably, a pin shaft sleeve 4 may also be included. The pin shaft sleeve 4 is respectively vertically connected between the hinge parts 10 on each two left-right symmetrically arranged inner chain plates 11 and is sleeved on the outer side wall of each pin shaft 3 .

[0030] Among them, the pin shaft sleeve 4 can protect the pin shaft 3 from being damaged by external factors, and can maintain the correct position of the pin shaft 3, improve the stability of the chain, and can also reduce the friction between the chain and the bicycle gear, extend the service life of the chain, make gear shifting smoother, and improve the riding experience.

[0031] In summary, the utility model significantly improves the performance and durability of the chain and can meet the needs of high-speed electric-assisted bicycles.

[0032] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A crescent chain, characterized in that: The invention comprises a plurality of inner chain links (1), a plurality of outer chain plates (2), and a pin shaft (3); the inner chain links (1) are connected end to end in sequence through the outer chain plates (2); the inner chain links (1) and the outer chain plates (2) are rotatably connected through the pin shaft (3); each inner chain link (1) comprises two inner chain plates (11); the two inner chain plates (11) are arranged symmetrically; the inner chain plates (11) and the outer chain plates (2) are arranged in a crescent-shaped structure; the inner chain plates (11) and the outer chain plates (2) each comprise two ends connected to the pin shaft. A hinged portion (10) connected by a shaft (3) and a waist portion (20) that serves as a connection between the two hinged portions (10), wherein the hinged portion (10) is provided with two through holes (101) for inserting the pin shaft (3), one side of the waist portion (20) is inwardly concave to form an arc structure (201), and the other side of the waist portion (20) is provided with a linear structure (202), and the connection parts between the hinged portion (10) and the arc structure (201) and the linear structure (202) are all provided with an arc transition.

2. A crescent-shaped chain according to claim 1, characterized in that: The inner side wall edges of the inner link plates (11) are all provided with chamfered structures (111).

3. A crescent-shaped chain according to claim 1, characterized in that: A concave structure (112) located at the edge of the through hole (101) is provided on the hinged portion (10) of the inner side wall of the inner link piece (11).

4. A crescent-shaped chain according to claim 1, characterized in that: The edges of the waist portion (20) on the inner side wall of the outer link piece (2) are respectively provided with guide slopes (21) corresponding to the shapes thereof.

5. A crescent-shaped chain according to claim 1, characterized in that: The shape of the hinge part (10) is set to be circular or elliptical.

6. A crescent-shaped chain according to claim 1, characterized in that: The outer chain pieces (2) are respectively arranged in a bilaterally symmetrical manner and are rotatably connected between two adjacent inner chain links (1) via a pin shaft (3).

7. A crescent-shaped chain according to claim 1, characterized in that: It also includes a pin shaft sleeve (4), which is respectively vertically connected between the hinge parts (10) on each two inner chain plates (11) symmetrically arranged on the left and right, and is sleeved on the outer side wall of each pin shaft (3).

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