A split-type glued cylindrical shaft

Abstract

This utility model provides a split-type glued cylindrical shaft, comprising: a main shaft, a clamping end integrally formed at the front end of the main shaft, a clamping part glued to the clamping end, an oblong hole at the rear end of the clamping part, a fixing end integrally formed at the rear end of the main shaft, a fixing part glued to the fixing end, a threaded opening on the right end of the circumferential surface of the fixing part, and a hollow through-hole oblong hole inside the fixing part. This split-type glued cylindrical shaft offers advantages such as reasonable structure, ease of processing, easy maintenance, and anti-rotation function.

Description

Technical Field

[0001] This utility model relates to the field of bicycle parts technology, and more specifically, to a split-type glued cylindrical shaft. Background Technology

[0002] In modern bicycle structures, the thru-axle is a crucial component connecting the frame and wheelset, and its performance directly affects the overall stability, handling, and riding safety of the bicycle. Traditional thru-axles often use a one-piece metal structure (such as aluminum alloy or titanium alloy), which, while possessing a certain strength and rigidity, suffers from problems such as heavy weight, high manufacturing costs, and inconvenient replacement and maintenance.

[0003] With the widespread application of carbon fiber composite materials in the bicycle industry, carbon fiber slack rods are gradually gaining popularity due to their advantages such as lightweight and high strength. However, most existing carbon fiber slack rods still use a one-piece molding process, which leads to high manufacturing difficulty, low yield, and the need to replace the entire rod if partial damage occurs, resulting in high maintenance costs.

[0004] Furthermore, in actual use, some carbon fiber cylinder shafts are prone to relative rotation due to unreasonable structural design and lack of effective anti-rotation structure between the main shaft and the connection parts at both ends. This can affect the overall stability and service life of the cylinder shaft after being subjected to force or frequent disassembly and assembly.

[0005] Therefore, there is an urgent need to provide a carbon fiber cylinder shaft structure that is structurally sound, easy to manufacture, easy to maintain, and has anti-rotation function to solve the above problems. Summary of the Invention

[0006] This utility model aims to solve the technical problems mentioned in the background art by providing a split-type glued cylindrical shaft. Specifically, it is a split-type glued cylindrical shaft with a three-section structure connected by adhesive. A waisted structure (i.e., a waist-shaped hole matching a waist-shaped shaft) is provided at the connection between the main shaft and the clamping and fixing parts to form a reliable anti-rotation position, thereby preventing relative rotation between the sections and enhancing the overall torsional resistance. At the same time, this structure is easy to process, assemble and maintain, reducing production and use costs, and has good application prospects and promotion value.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a split-type glued cylindrical shaft, comprising: a main shaft, a clamping end integrally formed at the front end of the main shaft, a clamping part bonded to the clamping end by adhesive, a waist-shaped hole opened at the rear end of the clamping part, a fixed end integrally formed at the rear end of the main shaft, a fixed part bonded to the fixed end by adhesive, a threaded opening at the right end of the circumferential surface of the fixed part, and a hollow through waist-shaped hole also opened inside the fixed part.

[0008] A further preferred embodiment: the length of the shaft is A, 164mm ≥ A ≥ 120mm, and the main shaft and clamping part are made of carbon fiber.

[0009] A further preferred embodiment: the clamping end is a waist-shaped shaft with vertical flat cuts on the left and right sides, semi-circular arcs at the top and bottom, and a hollow interior, and the shaft diameter of the clamping end is smaller than the shaft diameter of the main shaft.

[0010] A further preferred embodiment: the length of the clamping part is greater than the length of the clamping end.

[0011] A further preferred embodiment: the waist-shaped hole of the clamping part fits tightly with the clamping end, and the waist-shaped hole of the clamping part prevents the clamping end from rotating.

[0012] A further preferred embodiment: a gasket is glued to the front end of the clamping part, and the surface of the gasket is knurled.

[0013] A further preferred embodiment: a hollow hexagonal groove is provided at the center of the front end of the clamping part.

[0014] A further preferred embodiment: the fixed end is also a waist-shaped shaft with vertical flat cuts on the left and right sides, semi-circular arcs at the top and bottom, and a hollow interior. The length of the fixed end is greater than the length of the clamping end, and the shaft diameter of the fixed end is equal to the shaft diameter of the clamping end.

[0015] A further preferred embodiment: the front end of the fixing part is conical in shape and hollow inside.

[0016] A further preferred embodiment: the oblong hole of the fixing part fits tightly with the fixing end, and the oblong hole of the fixing part prevents the fixing end from rotating. Beneficial effects

[0017] 1. By providing oblong holes that match the oblong shafts (clamping end and fixed end) at both ends of the main shaft, a mechanical anti-rotation function is achieved to prevent the clamping and fixed parts from rotating on the main shaft; the torsional rigidity of the connection part is improved, enhancing the overall structural reliability; and with the help of adhesive bonding, a stable connection is formed.

[0018] 2. The anti-rotation function is achieved by connecting clamping and fixing parts at both ends of the spindle and using a matching design of waist-shaped holes and waist-shaped shafts. At the same time, glue is used to bond them together, so as to achieve a stable structure and easy processing and maintenance.

[0019] 3. In summary, this type of split-type glued cylindrical shaft has a reasonable structure, is easy to process and maintain, and has an anti-rotation function. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2This is a front view structural diagram of the present invention.

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 4 This is a schematic diagram of the fixing part structure of this utility model.

[0024] Figure 5 This is a cross-sectional view of the fixing part of this utility model.

[0025] Figure 6 This is a side view of the fixing part of this utility model.

[0026] Figure 7 This is a schematic diagram of the split-explosion structure of this utility model.

[0027] Figure 8 This is an exploded structural diagram of the gasket and clamping part of this utility model.

[0028] Figure 9 This is a schematic diagram of the split-explosion structure from another perspective of this utility model.

[0029] Figure 1-9 In the middle: 1. Spindle; 101-Clamping end; 102-Fixed end; 2. Clamping part; 201-Washer; 3. Fixing part; 301-Thread; 302-Oval hole. Detailed Implementation

[0030] The following will refer to the appendix in the embodiments of this utility model. Figures 1-9 The technical solutions in the embodiments of this utility model will be clearly and completely described.

[0031] Please see Figure 1-9In this embodiment of the utility model, a split-type glued thru-axle includes: a main shaft 1, which is the core load-bearing part of the entire thru-axle, acting as a bridge connecting the clamping part 2 and the fixing part 3, and bearing loads such as shear force and torque from the frame and wheelset. The main shaft 1 is made of carbon fiber, which is lightweight and high-strength. It has a clamping end 101 at the front end and a fixing end 102 at the rear end. Both the clamping end 101 and the fixing end 102 are waist-shaped structures to prevent rotation. The clamping end 101 is integrally formed at the front end of the main shaft 1, serving as a transition section between the main shaft 1 and the clamping part 2, providing a waist-shaped anti-rotation structure to prevent relative rotation of the clamping part 2 on the main shaft 1. The clamping end 101 is glued to the clamping part 2, which is connected to the bicycle fork or frame interface. It is the user's operating end, used to screw in / out the thru-axle, and works with the gasket 201 and hexagonal groove to achieve tool installation and removal. The clamping part 2 is also made of carbon fiber. The clamping part 2 has a gasket bonding surface at its front end to increase the contact area and strength; the clamping part 2 has an oblong hole 302 at its rear end, which is tightly connected to the fixed end 102 to prevent rotation; the rear end of the spindle 1 has a fixed end 102 integrally formed, and the fixed end 102 is glued to the fixed part 3. The fixed part 3 serves as the connection end on the other side and is usually used to cooperate with the quick release mechanism or the interface on the other side of the frame; the right end of the circumferential surface of the fixed part 3 has a thread 301 for easy connection with other components, such as for connecting quick release or locking devices; the fixed part 3 also has a hollow through oblong hole 302 inside, which effectively prevents rotation and improves anti-torsion performance; the three-section spindle 1, clamping part 2 and fixed part 3 are connected to the two ends of the spindle 1 respectively, and the anti-rotation function is achieved by using the oblong hole 302 and oblong shaft matching design. At the same time, the glue bonding is used to achieve the purpose of structural stability, easy processing and maintenance.

[0032] In this embodiment of the utility model, the length of the shaft is A, 164mm≥A≥120mm, the main shaft 1 and the clamping part 2 are made of carbon fiber, and the fixing part 3 can be made of carbon fiber or aluminum alloy.

[0033] In this embodiment of the utility model, the clamping end 101 is a waist-shaped shaft with vertical flat cuts on the left and right sides, semi-circular arcs at the top and bottom, and a hollow interior. The hollow interior can reduce weight. The shaft diameter of the clamping end 101 is smaller than the shaft diameter of the main shaft 1, which facilitates insertion into the waist-shaped hole 302 of the clamping part 2. The clamping end 101 and the waist-shaped hole 302 of the clamping part 2 cooperate to form an anti-rotation position.

[0034] In this embodiment of the invention, the length of the clamping part 2 is greater than the length of the clamping end 101, ensuring that the bonding area is large enough.

[0035] In this embodiment of the present invention, the waist-shaped hole 302 of the clamping part 2 is tightly fitted with the clamping end 101, and the waist-shaped hole 302 of the clamping part 2 prevents the clamping end 101 from rotating.

[0036] In this embodiment of the present invention, a gasket 201 is glued to the front end of the clamping part 2. The gasket 201 has a grooved and perforated disc-shaped structure with a hollow center that fits a hexagonal groove. It is glued to the front end of the clamping part 2 to increase the contact area between the front end of the clamping part 2 and the frame, disperse pressure, and prevent local stress concentration from causing damage to the carbon fiber. The surface of the gasket 201 is knurled to enhance friction, prevent slippage, and enhance the appearance and installation stability.

[0037] In this embodiment of the utility model, a hollow hexagonal groove is provided at the center of the front end of the clamping part 2, which facilitates operation with a wrench or hexagonal tool.

[0038] In this embodiment of the utility model, the fixed end 102 is also a waist-shaped shaft with vertical flat cuts on the left and right, semi-circular arcs at the top and bottom, and hollow inside. The length of the fixed end 102 is greater than the length of the clamping end 101, which improves the connection stability. The shaft diameter of the fixed end 102 is equal to the shaft diameter of the clamping end 101 to ensure consistency and ensure that the entire cylinder shaft will not loosen or shift due to force after installation.

[0039] In this embodiment of the utility model, the front end of the fixing part 3 is conical. The conical front end design facilitates insertion and installation and alignment during installation. The interior is hollow and has a waist-shaped hole 302, which fits tightly with the fixing end 102.

[0040] In this embodiment of the utility model, the waist-shaped hole 302 of the fixing part 3 is tightly fitted with the fixing end 102. The waist-shaped hole 302 of the fixing part 3 prevents the fixing end 102 from rotating, thereby realizing the mechanical anti-rotation function and preventing the fixing part 3 from rotating on the main shaft 1.

[0041] Working principle: Apply high-strength carbon fiber adhesive evenly to the clamping end 101 and insert it into the oblong hole inside the clamping part 2, ensuring the insertion depth meets the design requirements. After the adhesive cures, a firm connection is formed, preventing rotation. Similarly, apply adhesive to the fixing end 102 and insert it into the oblong hole inside the fixing part 3, paying attention to the alignment. After curing, an anti-rotation connection is achieved, enhancing the overall anti-torsional performance. Apply adhesive evenly to the outer perimeter of the hexagonal groove at the front end of the clamping part 2, and attach the knurled washer 201 to the front end of the clamping part 2 to increase the contact area and improve anti-slip performance. Insert the thru-axle into the hub axle hole from one side of the frame. The clamping part 2 is located on the operable side (usually the left side) for easy tool tightening. The fixing part 3 extends from the other side. Prepare to lock; use a wrench or quick-release device to tighten the right end thread 301 of the fixing part 3 to ensure a secure connection, while avoiding over-tightening to prevent damage to the carbon fiber; check whether the thru-axle is fully inserted and confirm that there is no looseness in the connecting parts on both sides; gently shake the wheelset to confirm that the connection is stable and there is no shaking or abnormal noise; during riding, the thru-axle transmits various torques from the frame and wheelset through the carbon fiber spindle 1. The anti-rotation structure of the waist-shaped hole 302 and the waist-shaped shaft effectively prevents relative rotation between the sections, ensuring connection stability. The split design means that when a part is damaged, only the corresponding part needs to be replaced, without replacing the whole part, reducing maintenance costs. Regularly check whether the thread 301 of the fixing part 3 and the connection are loose, and retighten if necessary.

Claims

1. A split-type glued cylindrical shaft, comprising: The spindle (1) is characterized in that: the front end of the spindle (1) is integrally formed with a clamping end (101), the clamping end (101) is bonded with a clamping part (2) by glue, the clamping part (2) has a waist-shaped hole (302) at the rear end, the rear end of the spindle (1) is integrally formed with a fixing end (102), the fixing end (102) is bonded with a fixing part (3) by glue, the fixing part (3) has a thread (301) at the right end of the circumferential surface, and the fixing part (3) also has a hollow through waist-shaped hole (302) inside.

2. The split-type glued cylindrical shaft according to claim 1, characterized in that: The length of the shaft is A, 164mm≥A≥120mm, and the main shaft (1) and clamping part (2) are made of carbon fiber.

3. The split-type glued cylindrical shaft according to claim 1, characterized in that: The clamping end (101) is a waist-shaped shaft with vertical flat cuts on the left and right, semi-circular arcs at the top and bottom, and hollow inside. The shaft diameter of the clamping end (101) is smaller than the shaft diameter of the main shaft (1).

4. A split-type glued cylindrical shaft according to claim 1, characterized in that: The length of the clamping part (2) is greater than the length of the clamping end (101).

5. A split-type glued cylindrical shaft according to claim 1, characterized in that: The waist-shaped hole (302) of the clamping part (2) fits tightly with the clamping end (101), and the waist-shaped hole (302) of the clamping part (2) prevents the clamping end (101) from rotating.

6. A split-type glued cylindrical shaft according to claim 1, characterized in that: The front end of the clamping part (2) is glued with a gasket (201), and the surface of the gasket (201) is knurled.

7. A split-type glued cylindrical shaft according to claim 1, characterized in that: The clamping part (2) has a hollow hexagonal groove at the center of its front end.

8. A split-type glued cylindrical shaft according to claim 1, characterized in that: The fixed end (102) is also a waist-shaped shaft with vertical flat cuts on the left and right, semi-circular arcs at the top and bottom, and hollow inside. The length of the fixed end (102) is greater than the length of the clamping end (101), and the shaft diameter of the fixed end (102) is equal to the shaft diameter of the clamping end (101).

9. A split-type glued cylindrical shaft according to claim 1, characterized in that: The front end of the fixing part (3) is cone-shaped and the inside is hollow.

10. A split-type glued cylindrical shaft according to claim 1, characterized in that: The waist-shaped hole (302) of the fixing part (3) fits tightly with the fixing end (102), and the waist-shaped hole (302) of the fixing part (3) prevents the fixing end (102) from rotating.

Images