OPENING-PREFABRICATED CARBON FIBER SPOKE AND METHOD FOR PREPARATION THEREOF

Abstract

The present invention discloses an opening-prefabricated carbon fiber spoke and a method for preparing thereof. The opening-prefabricated carbon fiber spoke includes: a spoke body made of carbon fiber, a nipple, and a nipple head. Both ends of the spoke body are a first fixed connector and a second fixed connector. The nipple is sleeved on the second fixed connector of the spoke body. A forked part of the second fixed connector is provided with a wedge pin. According to the present invention, a slope is formed at both ends of the spoke body, and the two ends are increasingly tight under an action of a pulling force, which greatly improves a tensile strength.

Claims

1. An opening-prefabricated carbon fiber spoke, comprising: a spoke body made of carbon fiber, a nipple that is configured to cooperate with and connect to a wheel rim, and a nipple head that is configured to cooperate with and connect to a hub, ends of the spoke body respectively have a first fixed connector and a second fixed connector, the first fixed connector is provided with a diameter-expanded part, the second fixed connector is provided with a forked part, the nipple and the nipple head are provided with penetrating mounting holes, the nipple head is sleeved on the first fixed connector of the spoke body, and the nipple is sleeved on the second fixed connector of the spoke body, and the forked part of the second fixed connector is provided with a wedge pin.

2. The opening-prefabricated carbon fiber spoke according to claim 1, wherein a cross-sectional shape of the spoke body between the first fixed connector and the second fixed connectors is circular, flat, oval, or diamond.

3. The opening-prefabricated carbon fiber spoke according to claim 1, wherein the penetrating mounting hole of the nipple head comprises a tapered hole part, a maximum inner diameter of the tapered hole part is not greater than a maximum outer diameter of the diameter-expanded part, and under an action of a pulling force, the nipple head is connected to the spoke body.

4. The opening-prefabricated carbon fiber spoke according to claim 1, wherein the spoke body is integrally formed and comprises the first fixed connector and a columnar body that extends forward, the diameter-expanded part of the first fixed connector is an inverted cone structure, and a maximum outer diameter of the inverted cone structure is 1.1-2 times a diameter of the columnar body.

5. The opening-prefabricated carbon fiber spoke according to claim 1, wherein the forked part of the spoke body is a Y-shaped structure.

6. The opening-prefabricated carbon fiber spoke according to claim 5, wherein the penetrating mounting hole of the nipple comprises a tapered hole part.

7. The opening-prefabricated carbon fiber spoke according to claim 1, wherein the spoke body, the nipple, and the nipple head are connected and fastened by adhesive.

8. A method for preparing an opening-prefabricated carbon fiber spoke, wherein the method comprises the following steps: step 1: forming a carbon fiber spoke body by thermoforming, one end of the carbon fiber spoke body is an expanded part with an inclination, and a second end of the carbon fiber spoke body is that a forked part in a closed state; step 2: sleeving a nipple head from a forked end of the carbon fiber spoke body, and placing the nipple head in place, so that an expanded end that is of the carbon fiber spoke body and that has a slope is inserted into the nipple head; step 3: sleeving a nipple from the forked end of the carbon fiber spoke body, applying an adhesive on the forked end of the carbon fiber spoke body, and then moving the nipple in place; step 4: applying the adhesive to a wedge pin and a part at which the forked end of the carbon fiber spoke body is bonded to the wedge pin; step 5: pressing the wedge pin into the forked end of the carbon fiber spoke body, so that the forked end of the carbon fiber spoke body expands and compresses an inner surface of a gradient hole of the nipple; and step 6: heating an assembled spoke assembly in an oven to cure the adhesive.

9. The method for preparing an opening-prefabricated carbon fiber spoke according to claim 8, wherein in step 2, before the nipple head performs sleeving, the adhesive is applied to the one end of the carbon fiber spoke body, so that the expanded part of the carbon fiber spoke body is further fastened to the nipple head by adhesive.

10. The method for preparing an opening-prefabricated carbon fiber spoke according to claim 8, wherein in step 1, the carbon fiber spoke body is formed by direct thermoforming and is Y-shaped, the one end of the carbon fiber spoke body provided with the slope is inserted into the nipple provided with the gradient hole, and the second end spreads the carbon fiber spoke body by using the wedge pin, and fastens the nipple to the carbon fiber spoke body, and bonding is performed by using an epoxy adhesive.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a schematic diagram according to an embodiment of the present invention.

[0025] FIG. 2 is an enlarged diagram of cooperation between a nipple and a spoke body according to an embodiment of the present invention.

[0026] FIG. 3 is an enlarged diagram of cooperation between a nipple and a spoke body according to an embodiment of the present invention.

[0027] FIG. 4 is a schematic diagram of an assembly process of a nipple and a spoke body according to the present invention.

[0028] FIG. 5 is a schematic diagram of a nipple according to an embodiment of the present invention.

[0029] FIG. 6 is a schematic diagram of a nipple according to an embodiment of the present invention.

[0030] FIG. 7 is a process diagram according to an embodiment of the present invention.

[0031] FIG. 8 is a diagram of a use state according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

[0032] The present invention is further described with reference to accompanying drawings.

[0033] Embodiments: Referring to FIG. 1 to FIG. 7, an opening-prefabricated carbon fiber spoke is provided, including a spoke body 1 made of carbon fiber, a nipple 2 that can cooperate with and connect to a wheel rim, and a nipple head 3 that can cooperate with and connect to a hub. Both ends of the spoke body 1 are a first fixed connector and a second fixed connector. The first fixed connector is provided with a diameter-expanded part 11, and the second fixed connector is provided with a forked part 12. The nipple 2 and the nipple head 3 are provided with penetrating mounting holes. The nipple head 3 is sleeved on the first fixed connector of the spoke body, and the nipple 2 is sleeved on the second fixed connector of the spoke body. The second fixed connector is provided with a wedge pin 4. A cross-sectional shape of the spoke body between the two fixed connectors may be circular, flat, oval, or approximately diamond, and is specifically designed according to actual requirements.

[0034] In an embodiment of this utility model, the spoke body 1 is formed integrally, one end of the spoke body 1 is formed as a first fixed connector, the other end is formed as a second fixed connector, and an intermediate position is formed as a columnar body. As shown in FIG. 3, the diameter-expanded part of the first fixed connector is an inverted cone structure. A maximum outer diameter D of the inverted cone structure is 1.1-2 times a diameter of the columnar body d, a ratio of D/d may be 1.2, 1.5, 1.6, 1.8, or the like. An aperture of a nipple head connected to the first fixed connector is adapted to the foregoing design.

[0035] In an embodiment of the present invention, for example, in FIG. 1, FIG. 2, and FIG. 5, the mounting hole of the nipple head 3 includes a tapered hole part 31 and a straight hole part 32. The tapered hole part 31 cooperates with the diameter-expanded part 11. A maximum inner diameter of the tapered hole part 31 is not greater than a maximum outer diameter of the diameter-expanded part 11 (a maximum diameter position of the spoke body). Under an action of pulling force, the nipple head 3 is combined to the spoke body 1 more tightly. The maximum inner diameter of the tapered hole part 31 may be equal to or less than the maximum outer diameter of the diameter-expanded part. Certainly, the maximum inner diameter of the tapered hole part 31 may alternatively be greater than the maximum outer diameter of the diameter-expanded part. In this case, a minimum inner diameter of the tapered hole part is less than the maximum outer diameter of the diameter-expanded part, to ensure that the diameter-expanded part of the spoke body is clamped in the tapered hole part. For example, in FIG. 1, FIG. 3, and FIG. 6, the forked part of the spoke body 1 is of a Y-shaped structure, and when sleeved into the nipple head 3 and the nipple 2, the forked part of the spoke body 1 is in a closed state. The wedge pin 4 is inserted, the forked part is opened and is tightly engaged with the nipple. The mounting hole of the nipple 2 includes a tapered hole part 21 and a straight hole part 22, and the tapered hole part is located at an outer port of the mounting hole of the nipple 2.

[0036] To improve a binding force of the spoke, in an implementation of the present invention, the spoke body 1 is firmly connected to the nipple 2 and the nipple head 3 by using adhesive, and specific steps are disclosed in the following.

[0037] When the present invention is used, for example, in FIG. 8, an outer end of the carbon fiber spoke 101 is connected to the wheel rim 102, an inner end of the spoke is connected to the hub 103. The carbon fiber spoke 101 deviates from a radial connection line M of and outer end connection point of the spoke and a center of the hub.

[0038] The present invention provides a method for preparing an opening-prefabricated carbon fiber spoke. As shown in FIG. 7, the method includes the following steps: [0039] Step 1: Form a Y-shaped carbon fiber spoke body by thermoforming. A size and shape of a middle part may be adjusted according to requirements. Shapes of two ends are shown in FIG. 7. In this case, a forked end is in a closed state; [0040] Step 2: Apply a high-temperature resistant adhesive to one end of an extended part of the carbon fiber spoke body; [0041] Step 3: Sleeve a metal nipple head from the forked end of the carbon fiber spoke body, and place the metal nipple head in place. As shown in FIG. 1, an end that is of the spoke body and that has a slope is inserted into the metal nipple head; [0042] Step 4: Sleeve a metal nipple from the forked end of the carbon fiber spoke body, apply the high-temperature resistant adhesive on the forked end of the carbon fiber spoke body, and then move the metal nipple in place; [0043] Step 5: Apply the high-temperature resistant adhesive to a wedge pin and a part at which the forked end of the carbon fiber spoke body is bonded to the wedge pin; [0044] Step 6: Press the wedge pin into the forked end of a carbon fiber spoke body, so that the forked end of the carbon fiber spoke body expands and compresses an inner surface of a gradient hole of the metal nipple; and [0045] Step 7: Heat an assembled spoke assembly in an oven to cure the adhesive.

[0046] In an embodiment of the present invention, the Y-shaped carbon fiber spoke body is formed by direct thermoforming, one end of the spoke body 1 provided with the slope is inserted into the metal nipple head 3 provided with a gradient hole, and the other end spreads the carbon fiber spoke by using the wedge pin 4, and fastens the metal nipple 2 to the carbon fiber spoke body 1, and then performs bonding by using a high-temperature epoxy adhesive.

[0047] In an embodiment of the present invention, combination among the nipple 2, the nipple head 3, and the carbon fiber spoke body 1 form an inverted circular truncated cone fixing manner. Under an action of a pulling force, the bonding is increasingly tight, thereby greatly improving a tensile strength.

[0048] The following table shows comparison between the embodiments in the present invention and light metal spokes on the market.

TABLE-US-00001 Weight excluding Maximum Maximum weight breaking fracture Length of a nut force deformation (mm) (g) (kgf) (mm) High-end 1 280 4.5 302.35 6.52 lightweight 2 280 4.4 305.80 6.25 metal spoke 3 280 4.5 318.52 6.58 avg. 4.47 308.89 6.45 Carbon fiber 1 279 3.2 456.20 6.56 poke in 2 280 3.2 442.32 6.84 implementation 3 280 3.2 420.55 6.36 of the present avg. 3.20 439.69 6.59 invention Comparison of ?28.4% 42.3% 2.1% differences % Advantages of 1. Approximately 30% lighter (lighter weight) the carbon 2. Fracture strength exceeds 40% (higher fracture strength) spoke 3. Similar maximum fracture deformation

[0049] The foregoing data is obtained from a test by a universal material tester. A test reference standard is ASTM D3039.

[0050] As described above, any modification or change made by a person skilled in the art by using the content of the technical content of the creation is within the scope of the creation, and is not limited to the embodiments.