CN103863486A - Shock-absorbing bicycle frame and its manufacturing method - Google Patents

Abstract

A shock-absorbing bicycle frame and a manufacturing method thereof are provided, the shock-absorbing bicycle frame comprises a tube body, the tube body is provided with an inner tube and an outer tube, the outer tube is sleeved on at least one part of the inner tube, no gap exists between the inner tube and the outer tube, the inner tube is made of fiber reinforced thermosetting plastic materials, and the outer tube is made of fiber reinforced thermoplastic plastic materials. The frame is produced by placing a fiber fabric impregnated with thermoplastic resin into a mold, and heating to 230-250 deg.C to form an outer tube; then, a fiber fabric impregnated with thermosetting resin is inserted into the outer tube and heated to 140 ℃ to 160 ℃ to form an inner tube in the outer tube. Therefore, the bicycle frame of the invention has light weight and good shock absorption effect, and the manufacturing method has simple steps, easy operation and high product yield.

Description

Shock-absorbing bicycle frame and its manufacturing method

technical field

The invention relates to a bicycle, in particular to a shock-absorbing bicycle frame and a manufacturing method thereof. The frame is not only light in weight and has good shock-absorbing performance, but also has simple manufacturing steps, easy construction and high product yield.

Background technique

Existing bicycle frames made of carbon fiber reinforced materials are all made of carbon fiber woven cloth impregnated with thermosetting resins such as epoxy resins as raw materials. Frame, due to the light weight and high structural strength of this material, has been widely used in the bicycle industry.

However, the shock-absorbing effect of the frame made of this material is not good. It must be equipped with springs or hydraulic shock absorbers to have shock-absorbing effect. However, adding shock absorbers will greatly increase the weight of the frame and reduce power transmission. Efficiency is a side effect. Therefore, how to manufacture a light and shock-absorbing bicycle frame has become an urgent research and development topic in the industry.

Contents of the invention

An object of the present invention is to provide a shock-absorbing bicycle frame, which is light in weight and has good shock-absorbing effect.

Another object of the present invention is to provide a method for manufacturing a shock-absorbing bicycle frame, which has simple steps, easy construction and high product yield.

In order to achieve the object disclosed above, the manufacturing method of the shock-absorbing bicycle frame provided by the present invention includes the following steps: (a) placing a preformed outer tube formed by winding a fiber woven cloth impregnated with thermoplastic resin into a mould, heating to 230°C to 250°C and applying pressure inside the preformed outer tube so that the outer edge of the preformed outer tube is attached to the inner wall of the mold to harden the preformed outer tube to form an outer tube; (b) A preformed inner tube formed by winding fiber woven cloth impregnated with thermosetting resin is inserted into the hardened outer tube; and (c) heating the preformed inner tube together with the outer tube to 140°C to 160°C, and The internal pressure of the preformed inner tube makes the outer edge of the preformed inner tube stick to the inner wall of the outer tube, so that the preformed inner tube is hardened to form an inner tube, and at the same time, the inner tube and the outer tube are seamlessly connected way joined together. Thereby, the manufacturing method of the present invention has simple steps, easy operation and high product yield.

The shock-absorbing bicycle frame made by this method includes a tubular body, the tubular body has an inner tube, and an outer tube is sleeved on at least a part of the inner tube, and there is no gap between the inner tube and the outer tube , the inner tube is made of fiber-reinforced thermosetting plastic, and the outer tube is made of fiber-reinforced thermoplastic. Thereby, the vehicle frame of the present invention is not only light in weight but also has good shock absorption effect.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

The shock-absorbing bicycle frame that Fig. 1 is made by a preferred embodiment of the present invention;

2 to 5 are schematic diagrams of the method of manufacture provided by a preferred embodiment of the present invention;

Figure 6 is a partial perspective view of a preferred embodiment of the present invention;

Fig. 7 is a partial perspective view of another preferred embodiment of the present invention.

Among them, reference signs

10 shock-absorbing bicycle frame

11 head tube 12 upper tube 13 lower tube

14 Riser 15 Rear upper fork 16 Rear fork

17 front fork 18 handle 19 seat tube

20' preform outer tube 20 outer tube 22 outer edge

23 inner wall 201 gap

24' preformed inner tube 24 inner tube 26 outer edge

28 tube body

30 mold 32 inner wall

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

Referring to Fig. 1, the shock-absorbing bicycle frame 10 provided by a preferred embodiment of the present invention has a head pipe 11, an upper pipe 12 extends horizontally from the head pipe 11, and a lower pipe 13 extends from the head pipe. 11 extends backward and downward, a standpipe 14 connects the rear end of the upper tube 12 and the downtube 13, a rear seat stay 15 extends backward from the upper section of the standpipe 14, and a rear chainstay 16 extends from the upper section of the standpipe 14. The lower part of the standpipe 14 extends backwards and is connected with the rear end of the seat stay 15, a front fork 17 is rotatably passed through the head pipe 11, a handle 18 is located at the top of the front fork 17, and a seat tube 19 is inserted in this standpipe 14, because each position of this vehicle frame 10 is all tubular, so hereinafter take the upper pipe 12 as an example to be described in detail.

The method for making the shock-absorbing bicycle frame (or the upper tube) provided by a preferred embodiment of the present invention includes the following steps:

纤维，其中以碳纤维为佳，该热塑性树脂可采用而不限于尼龙(Nylon)、聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PS)、ABS树脂或聚氯乙烯(PVC)，其中以尼龙6、尼龙11、尼龙12或尼龙66为宜；接着，如图3所示，将该预型外管20'置入一模具30中，加热至230℃至250℃并于该预型外管20'内部施压使该预型外管20'的外缘22贴抵于该模具30的内壁32，约30分钟后，即可使该预型外管20'硬化形成一外管20。于本步骤中，加热温度以240℃为宜，且是以高于一大气压的气体灌入该预型外管20'中而对该预型外管20'内部施压。(a) As shown in Figure 2, a fiber woven cloth impregnated with thermoplastic resin is wound into a preformed outer tube 20', wherein, the fiber can be used but not limited to carbon fiber, boron fiber, glass fiber or Kevlar

Fiber, wherein carbon fiber is preferred, the thermoplastic resin can be used but not limited to nylon (Nylon), polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS resin or polyvinyl chloride (PVC), Wherein it is advisable to use nylon 6, nylon 11, nylon 12 or nylon 66; Then, as shown in Figure 3, this preform outer tube 20 ' is inserted in a mold 30, is heated to 230 ℃ to 250 ℃ and in this preform The outer edge 22 of the preformed outer tube 20' is pressed against the inner wall 32 of the mold 30. After about 30 minutes, the preformed outer tube 20' can be hardened to form an outer tube. 20. In this step, the heating temperature is preferably 240° C., and the preformed outer tube 20 ′ is pressurized by injecting gas with a pressure higher than atmospheric pressure into the preformed outer tube 20 ′.

纤维，惟以碳纤维为宜，该热固性树脂可采用而不限于环氧树脂、亚克力树脂、酚树脂或聚氨基甲酸脂(PU)，以环氧树脂为宜。(b) As shown in Figure 4, a fiber woven cloth impregnated with thermosetting resin is wound into a preformed inner tube 24', and the preformed inner tube 24' is inserted into the hardened outer tube 20 to strengthen the preformed tube. The bonding force between the mold inner tube 24' and the outer tube 20 can be coated with an adhesive material on the outer edge of the preformed inner tube 24' or the inner wall 23 of the outer tube 20. The adhesive material can be epoxy resin, other liquids or Other solids, the two can be more firmly combined by using an adhesive material, wherein the fiber can be used but not limited to carbon fiber, boron fiber, glass fiber or Kevlar

Fiber, but preferably carbon fiber, the thermosetting resin can be but not limited to epoxy resin, acrylic resin, phenolic resin or polyurethane (PU), preferably epoxy resin.

(c) Finally, as shown in Figure 5, heat the preformed inner tube 24' together with the outer tube 20 in the mold 30 to 140°C to 160°C, preferably at 150°C, and heat them in the preform Pressure is applied inside the tube 24' so that the outer edge 26 of the preformed inner tube 24' is attached to the inner wall 23 of the outer tube 20. After about 15-30 minutes, the preformed inner tube 24' can be hardened to form an inner tube. tube 24, while the inner tube 24 and the outer tube 20 are joined together in a seamless manner. In this step, the preformed inner tube 24' is filled with gas higher than atmospheric pressure to The inner tube 24' is pressurized, and the mold used in this step and the mold in step (a) can be the same mold or different molds.

In this way, a specific part of the bicycle frame can be made, such as the upper tube 12, and the specific part can be combined with other parts to form a complete bicycle frame. In terms of structure, as shown in Figure 6, The shock-absorbing bicycle frame 10 includes a tubular body 28, the tubular body 28 has an inner tube 24, and an outer tube 20 is sleeved on the inner tube 24, and there is no gap between the inner tube 24 and the outer tube 20, the inner tube 24 The tube 24 is made of fiber-reinforced thermosetting plastic, and the outer tube 20 is made of fiber-reinforced thermoplastic, and the outer tube 20 can cover at least a part of the inner tube 24, and the inner tube 20 does not have to be Tube 24 is fully sheathed.

Since the inner tube 24 is made of fiber-reinforced thermosetting plastic, its rigidity is higher than that of the outer tube, but its elasticity (shock absorption) is lower than that of the outer tube, while the outer tube is made of fiber-reinforced thermoplastic material, its rigidity is lower than that of the inner tube, but its elasticity (shock absorption) is lower than that of the outer tube. property) is better than the inner tube, therefore, through actual testing, it is found that the bicycle frame made by the present invention has the rigidity and a considerable degree of elasticity (or shock absorption) that meet the requirements of use, and can effectively absorb the impact caused by the unevenness of the road surface. The rider's vibration reduces the rider's discomfort, and the weight is lighter than the existing bicycle frame with a shock absorber, which effectively improves the convenience of using the bicycle and has considerable market potential. Furthermore, the method provided by the present invention not only has simple steps, is easy to implement and has a high product yield, but also has the advantage of reducing production costs.

Based on the spirit of the present invention, the preparation method of the present invention can be applied to any position of the bicycle frame, such as head tube 11, upper tube 12, down tube 13, stand tube 14, rear upper fork 15, rear lower fork 16, front The fork 17, the handle 18 and the seat tube 19, especially the two-prong legs of the rear upper fork 15, the two-prong legs of the rear chainstay 16, or the two-prong legs of the front fork 17, the outer tube 20 is coated on the inner tube 24 The area can also be adjusted according to requirements, and it is not necessarily necessary to completely cover the inner tube 24. Even the outer tube 20 has a gap 201 and does not form a complete tube shape, as shown in FIG. 7, which should also be covered by the scope of the claims of the present invention. .

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1. A method for making a shock-absorbing bicycle frame is characterized in that it comprises the following steps: (a) Put a preformed outer tube formed by winding a fiber woven fabric impregnated with thermoplastic resin into a mold, heat to 230°C to 250°C and apply pressure inside the preformed outer tube to make the preformed outer tube the outer edge of the preform is attached to the inner wall of the mould, so that the preformed outer tube is hardened to form an outer tube; (b) inserting a preformed inner tube formed by winding a fiber cloth impregnated with a thermosetting resin into the hardened outer tube; and (c) heating the preformed inner tube together with the outer tube to 140°C to 160°C, and applying pressure inside the preformed inner tube so that the outer edge of the preformed inner tube is attached to the inner wall of the outer tube, so that The preformed inner tube is hardened to form an inner tube, and at the same time, the inner tube and the outer tube are joined together in a seamless manner. 2. The shock-absorbing bicycle frame according to claim 1, wherein the thermoplastic resin in step (a) is nylon, polyethylene, polypropylene, polystyrene, ABS resin or polyvinyl chloride. 3. The shock-absorbing bicycle frame according to claim 2, wherein the nylon is nylon 6, nylon 11, nylon 12 or nylon 66. 4. The shock-absorbing bicycle frame according to claim 1, characterized in that, in step (a), the inside of the preformed outer tube is pressurized with a gas higher than atmospheric pressure. 5. The shock-absorbing bicycle frame according to claim 1, wherein the thermosetting resin in step (b) is epoxy resin, acrylic resin, phenol resin or polyurethane. 6 . The shock-absorbing bicycle frame according to claim 1 , wherein, in the step (b), the preformed inner tube and the outer tube are bonded together by an adhesive material. 7 . 7 . The shock-absorbing bicycle frame according to claim 1 , wherein in step (c), the inside of the preformed inner tube is pressurized with a gas higher than atmospheric pressure. 8 . 8. A shock-absorbing bicycle frame, characterized in that it comprises: A pipe body has an inner pipe and an outer pipe sheathed on at least a part of the inner pipe, and there is no gap between the inner pipe and the outer pipe, the inner pipe is made of fiber-reinforced thermosetting plastic, and the outer pipe is Made of fiber reinforced thermoplastic. 9. The shock-absorbing bicycle frame according to claim 8, wherein the thermoplastic plastic of the outer tube is formed of nylon, polyethylene, polypropylene, polystyrene, ABS resin or polyvinyl chloride. 10. The shock-absorbing bicycle frame according to claim 9, wherein the nylon is nylon 6, nylon 11, nylon 12 or nylon 66. 11. The shock-absorbing bicycle frame according to claim 8, wherein the thermosetting plastic of the inner tube is formed of epoxy resin, acrylic resin, phenol resin or polyurethane. 12 . The shock-absorbing bicycle frame according to claim 8 , wherein the outer tube has gaps and does not form a complete tube shape. 13 .

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