A carbon fiber frame substrate and frame

Abstract

This invention relates to the field of bicycle technology, and particularly to a carbon fiber frame substrate, comprising a substrate body with a reinforcing portion; the inner surface of the reinforcing portion is provided with a first reinforcing rib, the first reinforcing rib extending radially and / or circumferentially along the inner surface of the reinforcing portion; the carbon fiber thickness of the substrate body is M, M∈[0.8mm,5mm]; the thickness of the first reinforcing rib is m, m∈[1.5mm,10mm]; the proportion of the inner surface area of ​​the reinforcing portion occupied by the first reinforcing rib is the reinforcing density Q, Q=X / (M*m), where X is the area ratio coefficient; M*m∈[1.2,20), X∈[0.4,16]; M*m∈[20,30), X∈[4,21]; M*m∈[30,50], X∈[9,30]; the frame using this substrate includes a seat tube, head tube, top tube and down tube, at least one tube body using this substrate. The carbon fiber frame substrate provided by this invention adapts to the difference in local stiffness requirements by adding reinforcing ribs to the reinforcing part, and reduces the complexity of the reinforcing rib structure by reasonably selecting the reinforcing density, thus avoiding increasing the difficulty of demolding.

Description

Technical Field

[0001] This invention relates to the field of bicycle technology, and in particular to a carbon fiber frame substrate and frame. Background Technology

[0002] Carbon fiber's advantages of being lightweight and rigid have made it an important material for bicycle frames as people increasingly demand higher cycling speeds and greater portability.

[0003] In the existing process of manufacturing carbon fiber substrates or frames for bicycles, gas is injected into the hollow cavity of an elastic molding mandrel to cause the mandrel to expand and form the desired shape. Then, carbon fiber cloth coated with molding adhesive is wrapped around the outer wall of the expanded elastic molding mandrel. After the molding adhesive dries and cures, the carbon fiber cloth can form a substrate or frame of the preset shape.

[0004] Because the stress conditions vary across different parts of the frame, the stiffness requirements of different areas of the frame also differ. Furthermore, the frame's shape and thickness may vary in certain areas due to design variations or functional requirements. To ensure sufficient stiffness in all parts of the frame, existing technologies require increasing the number of fiber cloth layers in areas with high stiffness requirements based on stress analysis. However, this method has low precision, reducing the accuracy of weight distribution across different areas of the frame. Additionally, the varying number of restraint cloth layers in different areas hinders production standardization, increases the likelihood of errors, and complicates post-production quality control. Therefore, developing a carbon fiber frame with greater stiffness and adaptability while maintaining the same number of carbon fiber cloth layers is a pressing technical problem for those skilled in the art. Summary of the Invention

[0005] The main objective of this invention is to provide a carbon fiber frame substrate that improves the stiffness of carbon fiber after molding, thereby enhancing the adaptability of carbon fiber frame substrates of the same thickness.

[0006] To achieve the above objectives, the present invention proposes a carbon fiber frame substrate, comprising a substrate body with a reinforcing portion; a first reinforcing rib is arranged on the inner surface of the reinforcing portion, the reinforcing rib extending radially and / or circumferentially along the inner surface of the reinforcing portion; the carbon fiber thickness of the substrate body is M, M∈(0.8mm, 5mm); the thickness of the first reinforcing rib is m, m∈(1.5mm, 10mm); the proportion of the inner surface area of ​​the reinforcing portion occupied by the first reinforcing rib is the reinforcing density Q, Q=X / (M*m)

[0007] When M*m∈(1.2, 20], X∈[0.4, 16];

[0008] When M*m∈(20, 30], X∈[4, 21];

[0009] When M*m∈(30, 50], X∈[9, 30].

[0010] The carbon fiber frame substrate provided by the present invention has a wider adaptability to the different requirements of local stiffness by adding reinforcing ribs to the reinforcing part. Furthermore, by reasonably selecting the reinforcing density, the complexity of the reinforcing rib structure is reduced, thus avoiding increasing the difficulty of demolding.

[0011] Preferably, there are two or more reinforcing parts.

[0012] Preferably, the reinforcing portion is located at the end of the base material. Since the end of the base material is the joint of the various composite base materials of the vehicle frame, the reinforcing portion is provided in this area to meet the rigidity requirements of this area.

[0013] To improve the rationality of the reinforcing rib layout, the reinforcing density is set within the following range according to the ratio between the thickness of the first reinforcing rib and the thickness of the reinforcing part:

[0014] The first scenario: When m / M≥4, Q≤0.3.

[0015] The second scenario is when m / M < 4, Q > 0.3.

[0016] Preferably, it further includes a second reinforcing rib, which extends radially along the inner surface of the substrate body and connects the reinforced and non-reinforced regions of the substrate body. The provision of the second reinforcing rib not only increases the rigidity of the non-reinforced region, but also effectively transfers the force on the non-reinforced region to the region where the reinforced region is provided.

[0017] Preferably, it also includes a third reinforcing rib, which is disposed in the non-reinforced area of ​​the substrate body.

[0018] The present invention also provides a vehicle frame using the above-mentioned substrate, wherein the frame body is composed of tubes, including a seat tube, a head tube, a top tube, and a bottom tube, and at least one tube uses the substrate.

[0019] Preferably, the reinforcing part is located at the end of the pipe body. Since the end of the pipe body is the joint where adjacent pipe bodies are connected, the reinforcing part is set in this area to meet the rigidity requirements of this area.

[0020] Preferably, at least two connected tubes have their internal cavities interconnected, and the connecting parts are provided with mutually compatible reinforcing sections. The mutual compatibility refers to the fact that the first reinforcing ribs facing each other at the connecting parts of adjacent tubes have the same shape and corresponding arrangement positions, forming a continuous and extending reinforcing rib, ensuring the reinforcing section's effect on improving rigidity. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A perspective view of the carbon fiber substrate provided in Example 1;

[0023] Figure 2 for Figure 1 Sectional view;

[0024] Figure 3 A perspective view of the vehicle frame provided in Embodiment 2;

[0025] Figure 4 for Figure 1 Sectional view

[0026] Explanation of icon numbers:

[0027] 1 Substrate body 2 Strengthening Department 3 First reinforcing rib 301 Radial stiffeners 302 Circumferential stiffener 4 Second reinforcing rib 5 Third reinforcing rib 1A frame body 1A1 Seat tube 1A2 Head tube 1A3 Top tube 1A4 Downpipe

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0032] See Figure 1 and Figure 2 This embodiment proposes a carbon fiber frame substrate, comprising a substrate body 1 with a reinforcing portion 2; the inner surface of the reinforcing portion 2 is provided with first reinforcing ribs 3, the reinforcing ribs 3 including radial reinforcing ribs 301 and circumferential reinforcing ribs 302. There are two reinforcing portions 2, located at two ends of the substrate body 1 respectively. The ratio of the inner surface area of ​​the first reinforcing rib to the area of ​​its respective reinforcing portion is the reinforcing density Q, the thickness of the carbon fiber in the substrate body is M, the thickness of the first reinforcing rib is m, and Q = X / (M*m), where X is the area ratio coefficient. In quality inspection, the tensile strength of the frame must be greater than 1300 MPa, the elastic modulus greater than 110 GPa, and it must not be damaged during demolding.

[0033] When M*m∈[1.2, 20) belongs to a thin frame, X∈[0.4, 16];

[0034] Example 1 0.8mm 1.5mm 1.2 0.4 33.3% 1538 137 no Example 2 4mm 4.5mm 18 16 88.9% 1743 128 no Comparative Example 1 0.8mm 1.5mm 1.2 0.3 25% 1233 114 no Comparative Example 2 4mm 4.5mm 18 17 94.4% 1792 87 yes

[0035] As can be seen from the above embodiments and comparative examples, when the area ratio coefficient X is lower than the set range, it will affect the pass rate of tensile strength. When X is higher than the set range, it will cause the elastic modulus to be unqualified and damage to occur during demolding.

[0036] When M*m∈[20, 30) belongs to the medium frame, X∈[4, 21];

[0037] Example 3 4mm 5mm 20 4 20% 1667 121 no Example 4 5mm 5.8mm 29 21 72.2% 1752 119 no Comparative Example 3 4mm 5mm 20 3 15% 1282 116 no Comparative Example 4 5mm 5.8mm 29 22 75.8% 1814 101 yes

[0038] As can be seen from the above embodiments and comparative examples, when the area ratio coefficient X is lower than the set range, it will affect the pass rate of tensile strength. When X is higher than the set range, it will cause the elastic modulus to be unqualified and damage to occur during demolding.

[0039] When M*m∈[30, 50], it belongs to the reinforced frame, X∈[9, 30].

[0040] Example 5 5mm 6mm 30 9 30% 1767 117 no Example 6 5mm 10mm 50 30 60% 1863 114 no Comparative Example 5 5mm 6mm 30 8 26% 1731 118 yes Comparative Example 6 5mm 10mm 50 32 64% 1887 101 yes

[0041] As can be seen from the above embodiments and comparative examples, due to the significant increase in the overall thickness of the reinforcing ribs, damage occurs during demolding when the area ratio coefficient X is higher or lower than the set range.

[0042] As a preferred option, either radial stiffener 301 or circumferential stiffener 302 can be selected.

[0043] As a preferred embodiment, a second reinforcing rib 4 is also included. The second reinforcing rib 4 extends radially along the inner surface of the substrate body 1 and connects the reinforcing part 2 and the non-reinforcing part area of ​​the substrate body 1. The provision of the second reinforcing rib 4 not only increases the rigidity of the non-reinforcing part area, but also effectively transfers the force on the non-reinforcing part to the area where the reinforcing part 3 is provided.

[0044] As a preferred embodiment, a third reinforcing rib 5 is also included, which is disposed in the non-reinforced area of ​​the substrate body 1.

[0045] As an example of applying the above embodiments to a vehicle frame, the frame body 1A is integrally formed from tubular bodies, including a seat tube 1A1, a head tube 1A2, a top tube 1A3, and a bottom tube 1A4. The reinforcing parts of each tube are located at the ends of their respective tubes. Since the ends of the tubes are the joints connecting adjacent tubes, the reinforcing parts are provided in this area to meet the rigidity requirements of this area.

[0046] As a technical solution not shown in this embodiment, each tube is an independently formed base material, and the frame is formed by splicing the base materials.

[0047] The cavities of adjacent tubes are connected, and the connecting parts are provided with mutually compatible reinforcing parts 2. The mutual compatibility means that the first reinforcing ribs 3 facing each other on the connecting parts of adjacent tubes are of the same shape and arranged in corresponding positions, which can form a continuous and extending reinforcing rib, ensuring the effect of the reinforcing parts 2 on improving rigidity.

[0048] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A carbon fiber frame substrate, comprising a substrate body with a reinforcing portion; wherein a first reinforcing rib is provided on the inner surface of the reinforcing portion, the first reinforcing rib extending radially and / or circumferentially along the inner surface of the reinforcing portion, characterized in that: The thickness of the carbon fiber substrate is M, where M ∈ [0.8 mm, 5 mm]. The thickness of the first reinforcing rib is m, where m ∈ [1.5 mm, 10 mm]. The ratio of the first reinforcing rib to the inner surface area of ​​the reinforcing part is the reinforcing density Q, where Q = X / (M * m), and X is the area ratio coefficient. When M*m∈[1.2, 20), X∈[0.4, 16]; When M*m∈[20, 30), X∈[4, 21]; When M*m∈[30, 50], X∈[9, 30].

2. The carbon fiber frame substrate as described in claim 1, characterized in that, The reinforcing section has two or more parts.

3. The carbon fiber frame substrate as described in claim 1 or 2, characterized in that, The reinforcing part is located at the end of the substrate.

4. The carbon fiber frame substrate as described in claim 1, characterized in that, When m / M≥4, Q≤0.

3.

5. The carbon fiber frame substrate as described in claim 1, characterized in that, When m / M < 4, Q > 0.

3.

6. The carbon fiber frame substrate as described in claim 1, characterized in that, It also includes a second reinforcing rib, which extends radially along the inner surface of the substrate body and connects the reinforced and non-reinforced areas of the substrate body.

7. The carbon fiber frame substrate as described in claim 1, characterized in that, It also includes a third reinforcing rib, which is arranged in the non-reinforced area of ​​the substrate body.

8. A vehicle frame using the substrate described in any one of claims 1-7, characterized in that, The frame body is composed of tubes, including a seat tube, head tube, top tube, and down tube, and at least one tube uses the aforementioned base material.

9. The frame as described in claim 8, characterized in that, The reinforcing section is located at the end of the tube.

10. The frame as described in claim 8, characterized in that, At least two interconnected tubes have their internal cavities connected, and the connecting parts are provided with mutually compatible reinforcing parts.

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