Method for manufacturing spoke assembly

Abstract

A method for manufacturing a spoke assembly, comprising the following steps: S1, providing a cylindrical preform made of carbon fibers; S2, providing a first connecting member and a second connecting member each provided with a tapered through hole; S3, respectively sleeving the first connecting member and the second connecting member on the middle portion of the preform; S4, wrapping both ends of the preform with continuous carbon fiber layers to form tapered column sections; S5, placing the preform in an end forming mold, so that the tapered column sections are integrally cured in one step to form fixed joints (14); S6, applying tensile force towards the end sides to both the first connecting member and the second connecting member, so as to force the first connecting member and the second connecting member to be respectively sleeved on the fixed joints (14) at both ends of the preform; S7, wrapping the middle portion of the preform with continuous carbon fiber layers, and placing the entire preform in a body forming mold for curing and forming, so that the middle portion of the preform forms a body portion, and the preform is processed into a spoke (1). The spoke (1) is not prone to delamination and slippage, and is safer and more reliable.

Description

Manufacturing method of spoke assembly TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber spoke manufacturing, in particular to a manufacturing method of spoke assembly. BACKGROUND

[0002] The spoke assembly is mainly applied to the bicycle rim, and the spoke assembly comprises a spoke 1' and a cap and a head respectively installed at two ends of the spoke 1'. Referring to FIGS. 7 and 8, the structure of the spoke 1' is as follows: the spoke 1' comprises a main body 11' located at the middle and in a flat shape, and end portions located at two ends and in a cylindrical shape. The inner side of the end portion is a cylindrical transition section 12', and the outer side is a fixed joint 13' formed by processing. The cap and the head are respectively fixedly sleeved outside the fixed joints 13' of the end portions at the two ends, and the cylindrical transition section 12' is exposed outside the cap or the head.

[0003] The manufacturing process of the existing spoke assembly is as follows: first, a cylindrical preform made of carbon fiber is heated and solidified, so that the middle part of the preform is heated and solidified to form a flat main body 11', and the two ends of the preform are also solidified to form a cylindrical structure, which comprises a cylindrical transition section 12' close to one side of the middle of the spoke 1' and a fixed section away from the other side of the middle of the spoke 1'. Then the cap and the cap are respectively inserted into the cylindrical transition section 12' of the cylindrical structure at the two ends of the spoke 1'. Then, the cap and the cap are respectively pulled outwards at the two ends of the spoke 1' by the limiting action of the fixed joint 13', so as to realize that the cap and the cap are respectively fixedly sleeved outside the fixed joints 13' at the two ends of the spoke 1'.

[0004] The spoke assembly manufactured by the above manufacturing method has the following shortcomings:

[0005] (1) The inner and outer two carbon fiber layers corresponding to the fixed joint 13' position of the spoke 1' are sequentially heated and solidified twice, that is, the inner layer 131' of the fixed joint (that is, the cylindrical structure) and the outer layer 132' of the fixed joint are sequentially heated and solidified, so that the fibers in the inner and outer two carbon fiber layers of the fixed joint 13' are discontinuous or discontinuous, which is easy to cause delamination and has certain safety hazards.

[0006] (2) Since the width of the main body part 11' is greater than the diameter of the end part, if the main body part 11' is first processed and formed, the cylindrical transition section 12' of the end part must be reserved for a longer length for the cap or cap head to be temporarily sleeved until the end part is fixed and the section is wrapped with a carbon fiber layer to form a fixed joint 13', and then the cap or cap head is withdrawn from the cylindrical transition section 12' and fixed outside the fixed joint 13'; this manufacturing method makes the length of the cylindrical transition section 12' longer, and correspondingly, the length of the main body part 11' is relatively shorter, that is, the length of the main body part 11' accounts for a smaller proportion of the overall length of the spoke 1', thereby making the wind resistance of the bicycle during riding larger, not easy to break the wind, and the stability is insufficient, which affects the riding efficiency and riding experience of the user.

[0007] SUMMARY

[0008] The present application aims to provide a manufacturing method of a spoke assembly to solve the above-mentioned technical problems.

[0009] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a manufacturing method of a spoke assembly, comprising the following steps:

[0010] S1, providing a cylindrical preform made of carbon fiber;

[0011] S2, providing a first connecting piece and a second connecting piece, both of which have a tapered through hole;

[0012] S3, sleeving the first connecting piece and the second connecting piece through the through hole at appropriate positions of the middle part of the preform;

[0013] S4, wrapping a continuous carbon fiber layer at both ends of the preform to form a tapered column section;

[0014] S5, placing the preform in an end forming mold, so that the tapered column sections at both ends of the preform are once cured and formed into fixed joints, so that the fibers in the two carbon fiber layers wrapped successively can be continuously distributed along the taper of the fixed joints;

[0015] S6, applying a pulling force to the first connecting piece and the second connecting piece towards the end side, forcing the first connecting piece and the second connecting piece to be sleeved on the fixed joints at both ends of the preform;

[0016] S7, wrapping a continuous carbon fiber layer in the middle part of the preform, and placing the entire preform in a main body forming mold for curing and forming, so that the middle part of the preform forms a main body part, so that the preform is processed into a spoke;

[0017] S8, again apply a pulling force to the first connecting piece and the second connecting piece towards the end side, force the first connecting piece and the second connecting piece to be more tightly sleeved on the fixed joint, and ensure that the overall length of the spoke assembly is accurate, thereby forming a complete spoke assembly.

[0018] Preferably, in step S7, the main body forming die solidifies and forms the middle part of the preform into a flat main body part.

[0019] Preferably, the spoke includes a cylindrical transition section between the main body part and the fixed joint, the cylindrical transition section is exposed outside the first connecting piece or the second connecting piece, and the length of the cylindrical transition section is less than the length of the first connecting piece and the second connecting piece respectively.

[0020] Preferably, the spoke further includes an inclined transition section between the main body part and the cylindrical transition section, the width of the inclined transition section gradually decreases from the main body part to the cylindrical transition section, and the two ends of the inclined transition section are respectively a circular end face and a flat face, the circular end face corresponds to and matches the cylindrical transition section, and the flat face corresponds to and matches the main body part.

[0021] Preferably, the direction of the spoke assembly towards the center of the spoke assembly is defined as the inner side, the direction away from the center of the spoke assembly is defined as the outer side, the through hole is a tapered through hole gradually increasing from the inside to the outside, the fixed joint is a tapered fixed joint gradually increasing from the inside to the outside, and the tapered through hole and the tapered fixed joint correspondingly limit and match.

[0022] Preferably, the first connecting piece is a cap for connecting and matching with the wheel rim, and the second connecting piece is a cap head for connecting and matching with the hub.

[0023] The present application has the following beneficial effects:

[0024] (1) The tapered column section of the two ends of the preform is once solidified and formed into the fixed joint by the end forming die, that is, the inner layer of the fixed joint and the outer layer of the fixed joint are heated and solidified together, so that the fibers in the two carbon fiber layers successively wrapped on the fixed joint can be continuously distributed along the taper of the fixed joint, without being disconnected, thereby making the fixed joint not prone to delamination and slippage, and being more safe and reliable.

[0025] (2) The cylindrical transition section of the end of the spoke does not need to reserve a relatively long length, and correspondingly, the length of the main body part can be relatively longer, so that the length of the main body part accounts for a larger proportion of the overall length of the spoke, and since the main body part is flat, the longer the main body part is, the smaller the wind resistance of the bicycle during riding is, and the bicycle is more easily broken wind. Through test tests, the wind breaking performance of the spoke assembly manufactured by the manufacturing method of the present application is improved by 20-30% compared with the wind breaking performance of the spoke assembly manufactured by the traditional manufacturing method, and the stability is good, and the riding efficiency and riding experience of the user are improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is an assembly view of a spoke assembly according to an embodiment of the present application;

[0027] Fig. 2 is an exploded view of a spoke assembly according to an embodiment of the present application;

[0028] Fig. 3 is a front view according to an embodiment of the present application;

[0029] Fig. 4 is a sectional view taken along line A-A of Fig. 3;

[0030] Fig. 5 is a structural view of a cap according to an embodiment of the present application;

[0031] Fig. 6 is a sectional view of a fixed joint of a spoke after one molding according to an embodiment of the present application;

[0032] Fig. 7 is a schematic view of an appearance of a spoke according to the prior art;

[0033] Fig. 8 is a sectional view of a fixed joint of a spoke after two moldings according to the prior art;

[0034] Reference Signs List:

[0035] Prior Art Part: 1' spoke, 11' main body, 12' cylindrical transition section, 13' fixed joint, 131' inner layer of fixed joint, 132' outer layer of fixed joint, 2' cap.

[0036] Present Application Part: 1 spoke, 11 main body, 12 inclined transition section, 13 cylindrical transition section, 14 fixed joint, 2 cap, 3 cap head, 4 through hole. DETAILED DESCRIPTION

[0037] To further illustrate the embodiments, the present application provides drawings. These drawings are part of the disclosure of the present application and mainly serve to illustrate the embodiments. With reference to the relevant description of the specification, those of ordinary skill in the art should be able to understand other possible implementations and advantages of the present application. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0038] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] For the convenience of description, the direction of the spoke assembly towards the center of the spoke assembly is defined as the inner side, and the direction away from the center of the spoke assembly is defined as the outer side.

[0041] Referring to FIGS. 1-6, as an embodiment of the present application, a manufacturing method of a spoke assembly is provided, comprising the following steps:

[0042] S1, providing a cylindrical preform made of carbon fiber;

[0043] S2, providing a first connecting piece and a second connecting piece, both of which have a tapered through hole 4;

[0044] S3, the first connecting piece and the second connecting piece are respectively sleeved on the appropriate position of the middle part of the preform through the through hole 4;

[0045] S4, wrapping a continuous carbon fiber layer at both ends of the preform to form a tapered column section;

[0046] S5, placing the preform in an end forming mold, so that the tapered column sections at both ends of the preform are once cured to form a fixed joint 14, so that the fibers in the two carbon fiber layers wrapped successively at the fixed joint 14 can be continuously distributed along the taper of the fixed joint;

[0047] S6, applying a pulling force towards the end side to both the first connecting piece and the second connecting piece, forcing the first connecting piece and the second connecting piece to be sleeved on the fixed joint 14 at both ends of the preform respectively;

[0048] S7, wrapping a continuous carbon fiber layer in the middle part of the preform, and placing the entire spoke 1 in a main body forming mold for curing and forming, so that the middle part of the preform forms a main body part 11, and so that the preform is processed into a spoke;

[0049] S8, again applying a pulling force towards the end side to both the first connecting piece and the second connecting piece, forcing the first connecting piece and the second connecting piece to be more tightly sleeved on the fixed joint 14, and ensuring the overall length of the spoke assembly to be accurate, thereby forming a complete spoke assembly.

[0050] In step S7, the main body forming die solidifies and forms the middle part of the preform into a flat main body part.

[0051] The first connecting part is a dental cap 2 for connecting with the rim, and the second connecting part is a cap head 3 for connecting with the hub.

[0052] The spoke 1 comprises a cylindrical transition section 13 between the main body part 11 and the fixed joint 14, which is exposed outside the first connecting part or the second connecting part, and the length of the cylindrical transition section 13 is less than the length of the first connecting part or the second connecting part.

[0053] The manufacturing method of the spoke assembly has the following advantages:

[0054] (1) The end forming die solidifies and forms the tapered column section of the two ends of the preform into the fixed joint 14 at one time, that is, the inner layer of the fixed joint 14 and the outer layer of the fixed joint 14 are heated and solidified together, so that the fibers in the two carbon fiber layers successively wrapped at the fixed joint 14 can be continuously distributed along the taper of the fixed joint 14 without being disconnected, thereby preventing the fixed joint 14 from being easily separated and making it more secure and reliable.

[0055] (2) The dental cap 2 and the cap head 3 can be temporarily fitted on the middle part of the preform at a proper position, and after the two ends of the preform are wrapped with continuous carbon fiber layers to form tapered column sections and are heated and solidified at one time to form the fixed joint 14, the dental cap 2 or the cap head 3 is pulled towards the two ends and fitted on the fixed joint 14 of the two ends of the preform, respectively, and the middle part of the preform is wrapped with continuous carbon fiber layers, and the entire preform is placed in the main body forming die for solidification and formation, so that the middle part of the preform is heated and solidified at one time to form the flat main body part 11, thereby processing the preform into the spoke 1; the dental cap 2 or the cap head 3 is pulled towards the end side for the second time, forcing the dental cap 2 or the cap head 3 to be more tightly fitted on the fixed joint 14, and ensuring the overall length of the spoke assembly to be accurate, thereby forming a complete spoke assembly. This method does not need to reserve a long length for the cylindrical transition section 13 at the end of the spoke 1, and correspondingly, the length of the main body part 11 can be relatively longer, so that the length of the main body part 11 accounts for a larger proportion of the overall length of the spoke 1, and since the main body part 11 is flat, the longer the main body part 11 is, the smaller the wind resistance of the bicycle during riding is, and it is easier to break the wind. Through test, the wind breaking performance of the spoke assembly manufactured by the manufacturing method of the present application is improved by 20-30% compared with the wind breaking performance of the spoke assembly manufactured by the traditional manufacturing method, and the stability is good, which improves the riding efficiency and riding experience of the user.

[0056] Of course, in other cases, the main body part can also be processed into other shapes other than flat, such as cylindrical or rhombic, etc.

[0057] In the embodiment, the direction of the spoke assembly towards the center of the spoke assembly is defined as the inner side, and the direction away from the center of the spoke assembly is defined as the outer side, the through hole 4 is a tapered through hole gradually increasing from the inside to the outside, the fixed joint 14 is a tapered fixed joint gradually increasing from the inside to the outside, the tapered through hole and the tapered fixed joint are correspondingly limited and matched, thereby realizing that the dental cap 2 and the cap head 3 are respectively fixedly sleeved on the outer fixed joint 14 of the end part on both ends of the spoke 1, since the rim and the hub respectively generate an outward pulling force on the dental cap 2 and the cap head 3, the tapered through hole and the tapered fixed joint in the tapered structure make the force on the dental cap 2 and the cap head 3 more stable, and the installation is more firm.

[0058] In the embodiment, the spoke 1 further comprises an inclined transition section 12 between the main body part 11 and the cylindrical transition section 13, the width of the inclined transition section 12 gradually decreases from the main body part 11 towards the cylindrical transition section 13, both ends of the inclined transition section 12 are respectively a circular end face and a flat face, the circular end face corresponds to and matches the cylindrical transition section 13, and the flat face corresponds to and matches the main body part 11, thereby making the transition between the main body part 11 and the cylindrical transition section 13 more smooth and stable.

[0059] Although the present application is specifically shown and introduced in combination with the preferred embodiments, it should be understood by those skilled in the art that various changes can be made to the present application in form and details without departing from the spirit and scope of the present application as defined in the appended claims, and all such changes fall within the protection scope of the present application.

Claims

1. A method for manufacturing a spoke assembly, characterized in that: Includes the following steps: S1. Provide a preform made of cylindrical carbon fiber; S2. Provide a first connector and a second connector, both of which have tapered through holes; S3. Fit the first connector and the second connector into appropriate positions in the middle of the preform through the through holes; S4. Cover both ends of the preform with continuous carbon fiber layers to form a conical column segment; S5. Place the preform in the end forming mold, so that the conical sections at both ends of the preform are solidified and formed into a fixed joint in one step, so that the fibers in the inner and outer carbon fiber layers that are successively covered can be continuously distributed along the taper of the fixed joint. S6. Apply a tensile force toward the end side to both the first connector and the second connector, forcing the first connector and the second connector to be respectively fitted onto the fixed joints at both ends of the preform. S7. A continuous carbon fiber layer is wrapped around the middle of the preform, and the entire preform is placed in the main molding mold to solidify and form the main body, thereby forming the main body in the middle of the preform, and thus processing the preform into spokes. S8. Apply a pulling force towards the end side to both the first connector and the second connector again, forcing the first connector and the second connector to be more securely fitted onto the fixed joint, and ensuring the overall length of the spoke assembly is accurate, thereby forming a complete spoke assembly.

2. The method for manufacturing a spoke assembly according to claim 1, characterized in that: In step S7, the main body molding mold solidifies the middle part of the preform to form a flat main body.

3. The method for manufacturing a spoke assembly according to claim 1, characterized in that: The spokes include a cylindrical transition section located between the body and the fixed joint. The cylindrical transition section is exposed outside the first connector or the second connector, and the length of the cylindrical transition section is less than the length of the first connector and the second connector, respectively.

4. The method for manufacturing a spoke assembly according to claim 3, characterized in that: The spokes also include an inclined transition section located between the main body and the cylindrical transition section. The width of the inclined transition section gradually decreases from the main body toward the cylindrical transition section. The two ends of the inclined transition section are a round end face and a flat surface, respectively. The round end face matches the cylindrical transition section, and the flat surface matches the main body.

5. The method for manufacturing a spoke assembly according to claim 1, characterized in that: The direction of the spoke assembly toward the center of the spoke assembly is defined as the inner side, and the direction away from the center of the spoke assembly is defined as the outer side. The through hole is a tapered through hole that gradually increases in size from the inside to the outside, and the fastener is a tapered fastener that gradually increases in size from the inside to the outside. The tapered through hole and the tapered fastener are correspondingly limited and fitted.

6. The method for manufacturing a spoke assembly according to claim 1, characterized in that: The first connector is a nut for connecting and mating with the rim, and the second connector is a cap for connecting and mating with the hub.

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