Bicycle pipe fitting, bicycle frame and bicycle

Abstract

The utility model relates to the technical field of bicycle manufacturing, in particular to a bicycle pipe fitting, a bicycle frame and a bicycle. The bicycle pipe fitting comprises a pipe fitting main body, the pipe fitting main body is a flat pipe fitting, a protrusion is arranged on the side wall of the pipe fitting main body towards the interior of a cavity of the pipe fitting main body, a groove is formed in the side, away from the cavity of the pipe fitting main body, of the protrusion, the protrusion is further provided with a threading hole, and the threading hole penetrates through the side wall of the groove. The central axis of the protrusion in the extending direction and the central axis of the pipe fitting body are obliquely arranged, the height of the protrusion is larger than the diameter of the threading hole, and the central axis of the threading hole and the central axis of the protrusion in the extending direction are collinear. And the central axis of the wire pipe is also obliquely arranged after the wire pipe is penetrated, so that the contact area between the wire pipe and the opening of the wire penetrating hole can be reduced, the abrasion of the wire harness can be reduced, and clamping stagnation is avoided. In addition, due to the arrangement of the protrusions, sharp edges or right-angle transition can be prevented from being formed at the openings of the threading holes, then stress concentration is reduced under the riding load, and bicycle pipe fitting breakage is avoided.

Description

Technical Field

[0001] This utility model relates to the field of bicycle manufacturing technology, and in particular to a bicycle tube fitting, a bicycle frame, and a bicycle. Background Technology

[0002] Existing internal cable routing technologies for bicycles mostly focus on the overall cable routing design, such as hiding the cable harness by reserving channels inside the frame tubes, which can be bottom bracket tubes, downtubes, top tubes, and / or rear forks.

[0003] However, the cable holes on thin-walled frame tubes are often created through milling or punching, resulting in sharp edges or right-angle transitions at the openings. Under riding loads, this can easily lead to stress concentration, causing cracks or even breakage at the cable holes, severely impacting the frame's lifespan. Furthermore, the sharp edges or right-angle transitions in the cable holes can cause cable wear or jamming during cable threading due to burrs at the port edges or improper angles.

[0004] Therefore, there is an urgent need for a bicycle fitting to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a bicycle fitting, bicycle frame and bicycle that can reduce stress concentration, ensure the life of the frame, and prevent wear or jamming of the wiring harness.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a bicycle fitting is provided, comprising a fitting body, the fitting body being a flat fitting, a protrusion being provided on the side wall of the fitting body toward the cavity of the fitting body, a groove being provided on the side of the protrusion away from the cavity of the fitting body, the protrusion also being provided with a wire hole, the wire hole penetrating the side wall of the groove, the central axis of the protrusion extending in the direction of extension being inclined to the central axis of the fitting body, the height of the protrusion being greater than the diameter of the wire hole, and the central axis of the wire hole being collinear with the central axis of the protrusion extending in the direction of extension.

[0008] As an optional technical solution for the aforementioned bicycle fitting, the main body of the fitting and the protrusion are connected by an arc-shaped transition piece.

[0009] As an optional technical solution for the above-mentioned bicycle tube fitting, the tube body, the arc-shaped transition piece, and the protrusion are integrally formed.

[0010] As an optional technical solution for the aforementioned bicycle fittings, the diameter of the arc-shaped transition piece is R, and the value of R ranges from 1mm to 3mm.

[0011] As an optional technical solution for the above-mentioned bicycle tube fitting, the angle between the central axis of the protrusion extension direction and the central axis of the tube body is β, wherein the value of angle β ranges from 15° to 35°.

[0012] As an optional technical solution for the above-mentioned bicycle fitting, the diameter of the conduit passing through the threading hole is set to d, and the diameter of the threading hole is D, wherein the value of D ranges from 1.03d to 1.2d.

[0013] As an optional technical solution for the above-mentioned bicycle fitting, the diameter of the conduit passing through the wire hole is set to d, and the height of the protrusion is L, wherein the value of L ranges from 1.05d to 1.5d.

[0014] As an optional technical solution for the above-mentioned bicycle tube fitting, the wall thickness of the tube body is w, wherein the value of w ranges from 0.85mm to 2.5mm.

[0015] Secondly, a bicycle frame is provided, comprising the bicycle tubes described in any of the above embodiments.

[0016] Thirdly, a bicycle is provided, including the bicycle frame described in the above-described solution.

[0017] This utility model has at least the following beneficial effects:

[0018] Because the cable hole is located on the protrusion, and the central axis of the cable hole is collinear with the center of the protrusion's extension direction, while the central axis of the protrusion's extension direction is inclined to the central axis of the main body of the tube, the central axis of the tube is also inclined after the cable is inserted. This reduces the contact area between the tube and the opening of the cable hole, minimizing cable wear and preventing jamming. Furthermore, the protrusion prevents sharp edges or right-angle transitions at the opening of the cable hole, thus reducing stress concentration under cycling loads and preventing bicycle tube breakage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the tube blank provided in an embodiment of the present utility model;

[0021] Figure 2 This is a structural schematic diagram of a bicycle fitting provided in an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the bicycle fitting through which the cable is threaded, provided in an embodiment of the present utility model.

[0023] Figure 4 A first sectional view of a bicycle fitting provided in an embodiment of this utility model;

[0024] Figure 5 A second sectional view of a bicycle fitting provided in an embodiment of this utility model;

[0025] Figure 6 A cross-sectional view of a bicycle fitting with a cable conduit provided in an embodiment of this utility model;

[0026] Figure 7 This is a first schematic diagram illustrating the manufacturing process of bicycle tubing according to an embodiment of the present invention;

[0027] Figure 8 This is a second schematic diagram illustrating the manufacturing process of bicycle fittings according to an embodiment of the present invention;

[0028] Figure 9 This is a third schematic diagram illustrating the manufacturing process of bicycle fittings according to an embodiment of the present invention.

[0029] Figure 10 This is a fourth schematic diagram illustrating the manufacturing process of bicycle fittings according to an embodiment of the present invention;

[0030] Figure 11 This is a fifth schematic diagram illustrating the manufacturing process of bicycle fittings according to an embodiment of the present invention.

[0031] Figure 12 This is a sixth schematic diagram illustrating the manufacturing process of bicycle fittings according to an embodiment of the present invention.

[0032] Figure 13 The seventh schematic diagram shows the manufacturing process of the bicycle tube provided in this embodiment of the utility model.

[0033] In the picture:

[0034] 1. Pipe body; 2. Protrusion; 21. Groove; 3. Wire hole; 4. Arc-shaped transition piece; 5. Liquid storage tank; 6. Gas storage tank; 7. Left pressure block; 8. Right pressure block; 9. First punch; 10. Second punch; 11. Upper punch; 12. Inner punch; 13. Lower die; 14. Conduit; 15. Pipe blank; 16. Exhaust valve; 17. Liquid; 18. Gas. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] To prevent the cable holes on thin-walled bicycle frames from forming sharp edges or right-angle transitions at the openings, which can easily lead to stress concentration under riding loads, causing cracks or even breakage, severely affecting the lifespan of the frame, and causing wear or jamming of the cable harness, this embodiment provides a bicycle fitting, bicycle frame, and bicycle that can reduce stress concentration, ensure the lifespan of the frame, and prevent wear or jamming of the cable harness.

[0040] like Figures 1 to 6As shown, the bicycle fitting includes a fitting body 1, which is a flat fitting. A protrusion 2 is provided on the side wall of the fitting body 1 towards the cavity of the fitting body 1. A groove 21 is provided on the side of the protrusion 2 away from the cavity of the fitting body 1. The protrusion 2 is also provided with a wire hole 3, which penetrates the side wall of the groove 21. The central axis of the protrusion 2 in the extension direction is inclined to the central axis of the fitting body 1. The height of the protrusion 2 is greater than the diameter of the wire hole 3. The central axis of the wire hole 3 is collinear with the central axis of the protrusion 2 in the extension direction.

[0041] Because the threading hole 3 is located on the protrusion 2, and the central axis of the threading hole 3 is collinear with the center of the extension direction of the protrusion 2, while the central axis of the extension direction of the protrusion 2 is inclined to the central axis of the tube body 1, the central axis of the tube 14 is also inclined after the tube is threaded through. This reduces the contact area between the tube 14 and the opening of the threading hole 3, thereby reducing wire wear and preventing jamming. In addition, the protrusion 2 also prevents sharp edges or right-angle transitions from forming at the opening of the threading hole 3, thus reducing stress concentration under riding loads and preventing bicycle tube breakage.

[0042] In some embodiments, the tube body 1 and the protrusion 2 are connected by an arc-shaped transition piece 4. The arc-shaped transition piece 4 can distribute stress to the entire bicycle frame, reduce the risk of cracking at the cable hole 3, and prevent the bicycle tube from breaking.

[0043] Specifically, the main body 1, the arc-shaped transition piece 4, and the protrusion 2 are integrally formed. This reduces the connection stress between the main body 1 and the arc-shaped transition piece 4, thereby strengthening the connection between the main body 1 and the protrusion 2.

[0044] In some embodiments, the angle between the central axis of the extension direction of the protrusion 2 and the central axis of the tube body 1 is β, wherein the value of angle β is in the range of 15° to 35°. For example, β can be selected as 15°, 20°, 25°, 30° or 35°. In this embodiment, no specific limitation is made. When β is 15°, the tube 14 can fit more closely to the tube body 1, so that the contact area between the tube 14 and the wire guide tube 14 after the tube 14 passes through the tube body 1 is smaller, which can reduce wire harness wear or jamming. When β is 35°, wire harness wear or jamming can be reduced, and the processing of the wire hole 3 is also convenient.

[0045] In some embodiments, the cross-section of the protrusion 2 is triangular, and the sidewall of the protrusion 2 is arc-shaped. A specific shape of the protrusion 2 is provided here. As long as the protrusion 2 can be formed and the wire hole 3 can be opened in the protrusion 2, it is within the scope of protection.

[0046] In some embodiments, the diameter of the arc-shaped transition member 4 is R, and the value of R ranges from 1mm to 3mm. For example, the value of R can be selected as 1mm, 2mm or 3mm. No specific limitation is made in this embodiment. When R is 1mm, the connection between the tube body 1 and the protrusion 2 can be realized. When R is 3mm, the stress can be distributed to the whole frame, reducing the risk of cracking of the wire hole 3.

[0047] In some embodiments, the diameter of the conduit 14 passing through the wire hole 3 is set to d, and the diameter of the wire hole 3 is D. The value of D ranges from 1.03d to 1.2d. For example, the value of D is 1.03d, 1.04d, 1.05d, 1.06d, 1.07d, 1.08d, 1.09d, 1.1d, 1.11d, 1.12d, 1.13d, 1.14d, 1.15d, 1.16d, 1.17d, 1.18d, 1.19d or 1.2d. In this embodiment, no specific limitation is made. When the value of D is 1.03d, it can prevent the conduit 14 from being fixed relative to the pipe body 1. When the value of D is 1.2d, it can facilitate the conduit 14 passing through the wire hole 3.

[0048] In some embodiments, the diameter of the conduit 14 passing through the wire hole 3 is set to d, and the height of the protrusion 2 is set to L. The value of L ranges from 1.05d to 1.5d. For example, the value of L is 1.05d, 1.1d, 1.15d, 1.2d, 1.25d, 1.3d, 1.35d, 1.4d, 1.45d or 1.5d. In this embodiment, no specific limitation is made. When the value of L is 1.05d, it can be ensured that the bottom of the wire hole 3 is higher than the protrusion 2, avoiding excessive friction between the conduit 14 and the wire hole 3. When the value of L is 1.5d, it can facilitate the processing of the wire hole 3.

[0049] In some embodiments, the wall thickness of the main body 1 of the pipe is w, where the value of w ranges from 0.85mm to 2.5mm. For example, the value of w is 0.85mm, 1mm, 1.5mm, 2mm or 2.5mm. No specific limitation is made in this embodiment. When the value of w is 0.85mm, the bicycle pipe can be made lighter, while when the value of w is 2.5mm, the overall strength of the bicycle pipe can be improved.

[0050] The thin-walled bicycle tube is formed using a tapered feature molding process, creating a sloping groove 21. A wire hole is then formed by hydraulic high-pressure forming or CNC machining, creating an inclined protrusion 2. The angle of the protrusion L differs slightly from the drilling angle, reducing frictional resistance between the wire harness and the edge of the wire hole 3. This design avoids sharp edges caused by traditional milling and also disperses stress through an arc-shaped transition piece 4.

[0051] By incorporating an arc-shaped transition piece 4 and reinforcing it with its inner wall, and then integrating it with the tube wall of the main tube body 1 through a one-piece molding process, this structure can distribute stress throughout the frame, reducing the risk of end cracking.

[0052] For frame tubes with a wall thickness of ≤2.5mm, a local thickening process (gas-liquid mixing compression molding + hydraulic internal high pressure expansion molding) is adopted in the port area. The local thickening process is an existing technology and will not be described in detail. This process increases the wall thickness of protrusion 2 to 1.05 to 1.3 times the original wall thickness while maintaining the overall lightweight of the bicycle tube.

[0053] The bicycle tubing provided in this embodiment can reduce costs by eliminating the need for welding the thickened cable hole accessory and reducing multiple processing steps. The arc-shaped transition piece 4 improves the deformation strength of the port and prevents wear on the cable sheath of the tubing 14. The bicycle tubing can be made of carbon fiber thin-walled frame, aluminum alloy thin-walled frame, or titanium alloy thin-walled frame (wall thickness 0.85mm-2.5mm).

[0054] like Figures 7 to 13 As shown, the bicycle tube is manufactured using a mold, which includes a lower die 13, an upper punch 11, a liquid storage tank 5, a gas storage tank 6, a first punch 9, a second punch 10, a left pressure block 7, a right pressure block 8, and an inner punch 12. The upper punch 11 is located above the lower die 13. The liquid storage tank 5 is connected to the first punch 9, and the liquid 17 in the liquid storage tank 5 enters the tube blank 15 through the first punch 9. The gas storage tank 6 is connected to the second punch 10, and an exhaust valve 16 is provided between the gas storage tank 6 and the second punch 10. The gas 18 in the gas storage tank 6 enters the tube blank 15 through the second punch 10. The left pressure block 7 and the right pressure block 8 are fixedly located on both sides of the bottom of the upper punch 11. The lower die 13 is used to support the tube blank 15.

[0055] The manufacturing process for bicycle tubing includes the following steps:

[0056] Step 1: Place the tube blank 15;

[0057] like Figure 1 As shown, it will be as follows Figure 1 The tube blank 15 to be formed into a conical shape is placed on the lower die 13 and the die is closed to a certain position.

[0058] Step 2: End sealing;

[0059] As shown in the figure, the end of the tube blank 15 is sealed by the first punch 9 and the second punch 10;

[0060] Step 3: Fill with liquid 17;

[0061] As shown in the figure, the liquid storage tank 5 fills the tube blank 15 with a certain volume of liquid 17 (the liquid 17 fills 70-90% of the volume).

[0062] Step 4: Inflate with gas 18;

[0063] As shown in the figure, the gas storage tank 6 fills the tube blank 15 with gas 18 and makes the pressure inside the tube blank 15 reach the set value.

[0064] Step 5: Mold closing and shaping;

[0065] As shown in the figure, the mold is closed to deform the tube blank 15, and the pressure inside the tube blank 15 is monitored in real time.

[0066] Step 6: Adjust the pressure;

[0067] As shown in the figure, when the internal pressure of the tube blank 15 exceeds or falls below the set value, the pressure is adjusted by filling or releasing gas 18 or liquid 17. After the complete pressing process is completed, the exhaust valve 16 inside the tube is opened. After injecting liquid 17 for a period of time, the exhaust valve 16 is closed. Then, high-pressure liquid 17 is filled in so that the rounded corners of the arc transition piece 4 are completely molded.

[0068] Step 7: The inner punch 12 moves forward to complete the punching of the wire hole 3 to obtain the bicycle tube;

[0069] Step 8: Release the pressure;

[0070] After molding is complete, keep the mold closed and quickly release liquid 17 to relieve the pressure inside the bicycle tube.

[0071] Step 11: The inner punch 12 retracts, the mold is opened, and the part is removed;

[0072] Open the mold and remove the shaped bicycle tube.

[0073] The bicycle tube fitting provided in this embodiment achieves a high-strength, low-resistance internal wiring port on a thin-walled bicycle tube fitting through a collaborative design of structure and process, filling the gap in the fine manufacturing process in the prior art.

[0074] This embodiment also provides a bicycle frame, which includes the bicycle tube provided in this embodiment.

[0075] The bicycle frame includes bicycle tubing. Since the cable hole 3 is located on the protrusion 2, and the central axis of the cable hole 3 is collinear with the center of the protrusion 2's extension direction, while the central axis of the protrusion 2's extension direction is inclined to the central axis of the tubing body 1, the central axis of the cable conduit 14 is also inclined after insertion. This reduces the contact area between the cable conduit 14 and the opening of the cable hole 3, minimizing cable wear and preventing jamming. Furthermore, the protrusion 2 prevents sharp edges or right-angle transitions at the opening of the cable hole 3, thereby reducing stress concentration under riding loads and preventing bicycle tubing breakage.

[0076] Since it includes the bicycle tubing described above, the bicycle frame of this utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.

[0077] This embodiment also provides a bicycle, which includes the bicycle frame provided in this embodiment.

[0078] The bicycle provided in this embodiment includes a bicycle frame. Since the cable hole 3 is located on the protrusion 2, and the central axis of the cable hole 3 is collinear with the center of the protrusion 2's extension direction, while the central axis of the protrusion 2's extension direction is inclined to the central axis of the tube body 1, the central axis of the cable tube 14 is also inclined after insertion. This reduces the contact area between the cable tube 14 and the opening of the cable hole 3, minimizing cable wear and preventing jamming. Furthermore, the protrusion 2 prevents sharp edges or right-angle transitions at the opening of the cable hole 3, thereby reducing stress concentration under riding loads and preventing bicycle tube breakage.

[0079] Since the bicycle frame described above is included, the bicycle of this utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.

[0080] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A bicycle tube, characterized in that, The utility model provides a kind of bicycle pipe fitting, including pipe body (1), the pipe body (1) is flat pipe fitting, the side wall of the pipe body (1) is provided with protrusion (2) to the cavity of the pipe body (1), the recess (21) is provided with to the side of the cavity of the pipe body (1) of the protrusion (2), the protrusion (2) is also provided with threading hole (3), the threading hole (3) penetrates the side wall of the recess (21), the center axis of the elongation direction of the protrusion (2) is obliquely arranged with the center axis of the pipe body (1), the height of the protrusion (2) is greater than the diameter of the threading hole (3), the center axis of the threading hole (3) is collinear with the center axis of the elongation direction of the protrusion (2).

2. The bicycle tube of claim 1, wherein, The pipe body (1) and the protrusion (2) are connected by arc transition piece (4).

3. The bicycle tube of claim 2, wherein, The pipe body (1), the arc transition piece (4) and the protrusion (2) are integrally formed.

4. The bicycle tube of claim 2, wherein, The diameter of the arc transition piece (4) is R, and R is in the range of 1mm-3mm.

5. The bicycle tube of claim 1, wherein, The angle between the center axis of the elongation direction of the protrusion (2) and the center axis of the pipe body (1) is β, wherein the value of angle β is in the range of 15°-35°.

6. The bicycle tube of claim 1, wherein, The diameter of the threading hole (3) is D, where D is in the range of 1.03d-1.2d.

7. The bicycle tube of claim 1, wherein, The diameter of the threading hole (3) is D, where D is in the range of 1.03d-1.2d.

8. The bicycle tube of claim 1, wherein, The wall thickness of the pipe body (1) is w, where w is in the range of 0.85mm-2.5mm.

9. A bicycle frame, characterized in that The utility model provides a kind of bicycle pipe fitting, including the bicycle pipe fitting of any one of claims 1-8.

10. A bicycle characterized in that, The utility model provides a kind of bicycle frame, including the bicycle frame of claim 9.

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