Carbon fiber transmission shaft

Abstract

The utility model discloses a carbon fiber transmission shaft, and relates to the technical field of unmanned aerial vehicles, the carbon fiber transmission shaft comprises a carbon fiber inner tube, the two ends of the carbon fiber inner tube are fixedly sleeved with spline shafts through adhesives, and the device adopts a composite structure design of the carbon fiber inner tube and a carbon fiber woven outer tube. The overall weight of the device is remarkably reduced, meanwhile, the bearing capacity and durability of the transmission shaft are improved through the high-strength characteristic of the carbon fiber material, the double requirements of a large unmanned aerial vehicle for light weight and high strength are met, and the concave-convex patterns arranged on the surface of the spline shaft increase the contact area and binding force of the carbon fiber woven outer pipe and the spline shaft; according to the device, through the arrangement of the first exhaust holes, air in the glue is exhausted, layering and bubble generation are avoided, the stability of the structure is further enhanced, and the device is suitable for unmanned rotor aircrafts and has wide application prospects and remarkable practical value.

Description

Technical Field

[0001] The utility model belongs to the technical field of unmanned aerial vehicles, and particularly relates to a carbon fiber transmission shaft. Background Art

[0002] Large UAVs play a key role in transportation and rescue due to their excellent load-bearing capacity and endurance. They can break through geographical restrictions and quickly deliver heavy cargo such as medical equipment and disaster relief supplies to remote areas such as mountainous areas and islands with inconvenient transportation. For unmanned rotorcraft, the weight of the aircraft itself is one of the important considerations.

[0003] Traditional drive shafts often use carbon steel and carbon alloy steel as the processing material of the drive shaft, and the spline shaft and drive shaft tube are welded together, which leads to problems such as heavy weight and large moment of inertia. To solve the above problems, we provide a carbon fiber drive shaft. Utility Model Content

[0004] The purpose of the present utility model is to provide a carbon fiber transmission shaft to solve the problem that the transmission shaft proposed in the above background technology often uses carbon steel and carbon alloy steel as the processing material of the transmission shaft, and the spline shaft and the transmission shaft tube are welded into shape, resulting in large weight and large moment of inertia.

[0005] The above technical purpose of the present utility model is achieved through the following technical solutions: a carbon fiber drive shaft, including a carbon fiber inner tube, both ends of the carbon fiber inner tube are fixedly sleeved with a spline shaft by an adhesive, the contact surface of the spline shaft and the carbon fiber inner tube is provided with a first anti-slip pattern, the outer periphery of the carbon fiber inner tube and the spline shaft is woven with a carbon fiber braided outer tube, the surface of the spline shaft is provided with a concave and convex pattern that fits the inner wall of the carbon fiber braided outer tube, a first exhaust hole is opened in the concave and convex pattern, and a second exhaust hole is also provided on the surface of the spline shaft, and the carbon fiber braided outer tube and the spline shaft are fixedly sleeved by an adhesive.

[0006] Preferably, the carbon fiber inner tube, the spline shaft and the carbon fiber braided outer tube have the same center, and the carbon fiber inner tube and the carbon fiber braided outer tube are fixedly sleeved together by an adhesive.

[0007] Preferably, the surface of the spline shaft is provided with a second anti-slip pattern adapted to the carbon fiber braided outer tube, and the surface of the spline shaft is provided with a plurality of third exhaust holes.

[0008] The utility model has the following beneficial effects:

[0009] The device significantly reduces its overall weight by adopting a composite structure design of a carbon fiber inner tube and a carbon fiber braided outer tube. At the same time, the high strength characteristics of the carbon fiber material improve the load-bearing capacity and durability of the drive shaft, meeting the dual requirements of large UAVs for lightness and high strength. The concave and convex pattern on the surface of the spline shaft increases the contact area and bonding force between the carbon fiber braided outer tube and the spline shaft. Combined with the first exhaust hole to discharge air in the glue, stratification and the generation of bubbles are avoided, further enhancing the stability of the structure. The device is suitable for unmanned rotorcraft and has broad application prospects and significant practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0011] Figure 2 This is an exploded schematic diagram of the utility model structure;

[0012] Figure 3 It is a three-dimensional diagram of the local structure of the utility model.

[0013] Figure numerals: 1, carbon fiber inner tube; 2, spline shaft; 3, carbon fiber braided outer tube; 4, concave-convex pattern; 5, first exhaust hole; 6, first anti-slip groove; 7, second exhaust hole; 8, second anti-slip groove; 9, third exhaust hole. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings.

[0015] Example 1:

[0016] refer to Figure 1-3 A carbon fiber drive shaft comprises a carbon fiber inner tube 1, with a spline shaft 2 fixedly sleeved on both ends of the carbon fiber inner tube 1 by an adhesive, the contact surface of the spline shaft 2 and the carbon fiber inner tube 1 is provided with a first anti-slip pattern 6, and the outer periphery of the carbon fiber inner tube 1 and the spline shaft 2 is woven with a carbon fiber braided outer tube 3, the surface of the spline shaft 2 is provided with a concave and convex pattern 4 that fits the inner wall of the carbon fiber braided outer tube 3, a first exhaust hole 5 is opened in the concave and convex pattern 4, and a second exhaust hole 7 is also provided on the surface of the spline shaft 2, and the carbon fiber braided outer tube 3 and the spline shaft 2 are fixedly sleeved by an adhesive.

[0017] Specifically, the inner diameter of the carbon fiber inner tube 1 is the benchmark for fixing the spline shafts 2 at both ends to ensure the precise concentricity of the spline shafts 2 at both ends. The outer diameter of the carbon fiber inner tube 1 is the benchmark lining of the carbon fiber braided outer tube 3. The carbon fiber braided outer tube 3 uses carbon fiber prepreg to weave layers from the surface of the carbon fiber inner tube 1 and the handle parts of the spline shafts 2 at both ends, and is molded and thermoset into one. The device is divided into three parts, namely the spline shaft 2, the carbon fiber inner tube 1 and the carbon fiber braided outer tube 3. During processing, the carbon fiber inner tube 1 and the spline shaft 2 are pre-installed by a concentricity fixing device, and then the carbon fiber braided outer tube 3 is woven on layer by layer. During weaving, the concentricity of the carbon fiber braided outer tube 3 is continuously improved. At the same time, the concave and convex pattern 4 on the surface of the spline shaft 2 allows the carbon fiber braided outer tube 3 to be firmly attached to the spline shaft 2. By providing a first exhaust hole 5, the air in the adhesive can be discharged. By providing a first anti-slip pattern 6, the firmness of the connection between the carbon fiber inner tube 1 and the spline shaft 2 can be effectively enhanced. By providing a second exhaust hole 7, the air in the adhesive can be discharged.

[0018] refer to Figure 1 The carbon fiber inner tube 1, the spline shaft 2 and the carbon fiber braided outer tube 3 are at the same center of a circle. The carbon fiber inner tube 1 and the carbon fiber braided outer tube 3 are fixedly connected by an adhesive, which can effectively reinforce the connection between the carbon fiber inner tube 1 and the carbon fiber braided outer tube 3.

[0019] refer to Figure 3 The surface of the spline shaft 2 is provided with a second anti-slip pattern 8 that is compatible with the carbon fiber braided outer tube 3, and the surface of the spline shaft 2 is provided with a plurality of third exhaust holes 9. By setting the second anti-slip pattern 8, the friction between the spline shaft 2 and the carbon fiber braided outer tube 3 can be enhanced, and by setting the third exhaust holes 9, the air in the adhesive can be discharged.

[0020] Brief description of the usage process: The device is divided into three parts, namely the spline shaft 2, the carbon fiber inner tube 1 and the carbon fiber braided outer tube 3. During processing, the carbon fiber inner tube 1 and the spline shaft 2 are pre-installed through a concentricity fixing device, and then the carbon fiber braided outer tube 3 is woven on layer by layer. The concentricity of the carbon fiber braided outer tube 3 is continuously improved during weaving. At the same time, the concave and convex pattern 4 on the surface of the spline shaft 2 is used to make the carbon fiber braided outer tube 3 firmly adhere to the spline shaft 2. By setting the first exhaust hole 5, the air in the glue can be discharged. By setting the first anti-slip pattern 6, the firmness of the connection between the carbon fiber inner tube 1 and the spline shaft 2 can be effectively enhanced. By setting the second exhaust hole 7, the air in the adhesive can be discharged.

[0021] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A carbon fiber transmission shaft, comprising a carbon fiber inner tube (1), characterized in that: The two ends of the carbon fiber inner tube (1) are fixedly sleeved with a spline shaft (2) by means of an adhesive, the contact surface of the spline shaft (2) and the carbon fiber inner tube (1) is provided with a first anti-slip pattern (6), the outer periphery of the carbon fiber inner tube (1) and the spline shaft (2) is woven with a carbon fiber braided outer tube (3), the surface of the spline shaft (2) is provided with a concave-convex pattern (4) that fits the inner wall of the carbon fiber braided outer tube (3), a first exhaust hole (5) is provided in the concave-convex pattern (4), and a second exhaust hole (7) is further provided on the surface of the spline shaft (2), and the carbon fiber braided outer tube (3) and the spline shaft (2) are fixedly sleeved by means of an adhesive.

2. The carbon fiber transmission shaft according to claim 1, characterized in that: The carbon fiber inner tube (1), the spline shaft (2) and the carbon fiber braided outer tube (3) are located at the same center of a circle, and the carbon fiber inner tube (1) and the carbon fiber braided outer tube (3) are fixedly sleeved together by an adhesive.

3. The carbon fiber transmission shaft according to claim 1, characterized in that: The surface of the spline shaft (2) is provided with a second anti-slip pattern (8) adapted to the carbon fiber braided outer tube (3), and the surface of the spline shaft (2) is provided with a plurality of third exhaust holes (9).

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