Shaft tube assembly, transmission shaft and preparation method of shaft tube assembly

Abstract

The invention relates to a shaft tube assembly which comprises a shaft tube body and a connecting piece. The two ends of the shaft tube body are coaxially connected with the connecting pieces; the shaft tube body is made of carbon fiber materials, and the connecting pieces are made of metal materials. The axle tube assembly has the beneficial effects that the two ends of the axle tube body made of the carbon fiber material are coaxially connected with the connecting pieces made of the metal material to form the axle tube assembly, so that the axle tube assembly can be connected with other metal connecting pieces through the connecting pieces made of the metal material, the overall mass is reduced, and meanwhile subsequent process installation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts, in particular to a shaft tube assembly, a transmission shaft and a method for preparing the shaft tube assembly. Background Art

[0002] In the domestic and international automotive industries, carbon fiber materials are highly praised by major automobile companies due to their high strength and low density at a time when lightweighting is prevalent. However, the bottlenecks of connection reliability and efficiency between carbon fiber materials and metal materials, as well as low production efficiency of subsequent processes, have not been well resolved, which restricts the market application of carbon fiber materials in the automotive industry.

[0003] For example, a drive shaft consists of a tube, yoke, and spline sleeve. While using carbon fiber for the tube can reduce the overall weight of the drive shaft, the metal yoke and spline sleeve make the connection between the tube, yoke, and spline sleeve less reliable and less efficient. Furthermore, if the drive shaft is out of balance during a dynamic balancing test, it becomes difficult to securely secure the balance plate to the tube. Therefore, solving these problems while ensuring a lightweight structure is a pressing technical challenge. Summary of the Invention

[0004] In response to the technical problems existing in the prior art, the present invention provides a method for preparing an axle tube assembly, a drive shaft, and an axle tube. For example, the method provides technical support for the subsequent reliable and efficient production of carbon fiber drive shafts. Carbon fiber materials can be used in automobiles, thereby improving the lightweight of automobiles and also improving the production efficiency of drive shafts.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A first aspect of the present invention provides a shaft tube assembly, comprising a shaft tube body and a connector; Both ends of the shaft tube body are coaxially connected to the connecting piece; The shaft tube body is made of carbon fiber, and the connecting piece is made of metal.

[0006] As a further technical solution, the shaft tube body includes a middle section and a connecting section; The connecting sections are symmetrically provided at both ends of the middle section, and the longitudinal section of the inner wall of the connecting section is constructed as a regular polygonal structure to transitionally match with the connecting piece.

[0007] As a further technical solution, the connecting piece is a hollow tubular structure, and the longitudinal section of one end of the connecting piece is constructed as a regular polygonal structure, so as to be adapted and fixed in the end of the connecting section whose longitudinal section is constructed as a regular polygon.

[0008] As a further technical solution, a raised abutting portion is provided along the circumferential outer surface of the connecting piece to abut against the end surface opposite to the shaft tube body.

[0009] As a further technical solution, the inner diameter of the middle section is smaller than the inner diameter of the connecting section.

[0010] A second aspect of the present invention provides a method for preparing a shaft tube, comprising the following steps: S1. Prepare a shaft tube body and a connector, wherein the shaft tube body is made of carbon fiber and the connector is made of metal; S2. Applying adhesive to the outer surface of one end of the connector; S3. Connecting connectors are respectively connected at both ends of the shaft tube body, and one end of the connector coated with adhesive is inserted into the shaft tube body, and the other end of the connector is exposed from the shaft tube body; then holes are drilled at both ends of the shaft tube body, and the shaft tube body and the connector are riveted and fixed by rivets to form a shaft tube assembly.

[0011] As a further technical solution, in step S1, the longitudinal cross-section structure of the inner wall at both ends of the shaft tube body is processed into a regular polygon with N sides; The longitudinal section structure of one end of the connecting piece is processed into a regular polygon with N sides, and the longitudinal section structure of the other end of the connecting piece is processed into a circular ring; A raised abutment portion is processed along the outer surface of the connector in the circumferential direction, so that the abutment portion abuts against the end surface opposite to the shaft tube body.

[0012] As a further technical solution, in step S2, an outer surface of one end of the regular polygon processed on the connecting member is coated with adhesive.

[0013] As a further technical solution, in step S3, when drilling holes at both ends of the shaft tube body, the connecting piece is provided below the drilling position, so that the shaft tube body and the connecting piece are simultaneously drilled and fixed by riveting pieces.

[0014] A third aspect of the present invention provides a transmission shaft comprising the shaft tube described in the first aspect.

[0015] The beneficial effects of the present invention are: 1. Connectors made of metal are coaxially connected at both ends of the carbon fiber axle tube body to form an axle tube assembly. This allows the metal connectors to be welded to other metal connectors in subsequent processes, reducing overall mass while facilitating subsequent welding processes. In addition, the regular polygonal structural design of the connecting section between the shaft tube body and the connector can ensure high stability and simple connection after the transition between the two, thereby improving the connection efficiency between the two. The end of the connector facing away from the shaft tube body is exposed on the shaft tube body and can be welded to other metal parts, such as spline sleeves and universal joint forks, to form a drive shaft, facilitating the mass production of the drive shaft. 2. During the axle tube production process, the axle tube body is used as the middle section and is made of carbon fiber material. The metal connector can simultaneously connect the axle tube body and other metal parts. This allows the axle tube to be lightweight while being welded to other metal parts without affecting the dynamic balancing process, creating conditions for the mass production of automotive drive shafts. In addition, during the preparation of the shaft tube, the inner walls of both ends of the shaft tube body are set to regular polygons, such as regular octagons. Correspondingly, the end of the connector connected to the shaft tube body is also set to a regular octagon, so that the shaft tube body and the connector are firmly connected while meeting the stiffness requirements. Furthermore, the two ends are set to regular octagons, which improves the coaxiality of the shaft tube body during the preparation process and facilitates processing, thereby reducing the difference caused by the size when the shaft tube body and the connector are connected. During the preparation process, one end of the connector, which is a regular octagon, is inserted into the corresponding end of the shaft tube body. The operation is convenient and does not require high technical skills of the operator. 3. During the preparation of the shaft tube, the outer surface of one end of the regular octagon of the connector is first coated with adhesive before being inserted into the shaft tube body, which improves the firmness of the connection between the shaft tube body and the connector; 4. The structural design of the shaft tube assembly in the drive shaft allows other metal parts to be directly welded to both ends of the shaft tube assembly without affecting the dynamic balancing process, facilitating the mass production of drive shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a semi-longitudinal cross-section of the shaft tube assembly of the present invention; Figure 2 Schematic diagram of the semi-longitudinal section structure of the shaft tube body of the present invention; Figure 3 The shaft tube body of the present invention is Figure 2 AA-direction cross-sectional view; Figure 4 Schematic diagram of a semi-longitudinal cross-section of the connector of the present invention; Figure 5 The connector of the present invention is Figure 4 BB-direction cross-sectional view; Figure 6 It is a schematic diagram of the semi-longitudinal section structure of the rotating shaft of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows: Axle tube body 1, middle section 11, connecting section 12; Connecting member 2, abutting portion 21; Riveted parts 3. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0019] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0020] In the description of this application, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art will recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0021] Example 1 In order to reduce the weight of the car and facilitate the reliable connection of carbon fiber materials and metal parts with high efficiency, this embodiment provides a shaft tube, see Figure 1 , including an axle tube body 1 and a connector 2; both ends of the axle tube body 1 are coaxially connected to the connector 2, and the axle tube body 1 is made of carbon fiber, and the connector 2 is made of metal. It should be noted that the connector 2 serves as a bridge connecting the axle tube body 1 with other metal parts to achieve the reliability of the connection between the carbon fiber axle tube assembly and the metal parts; Specifically, see Figure 1-Figure 3The shaft tube body 1 includes an intermediate section 11 and a connecting section 12; the connecting sections 12 are symmetrically provided at both ends of the intermediate section 11, and the longitudinal section of the inner wall of the connecting section 12 is a regular polygonal structure (such as a regular octagon) to transitionally fit with the connecting piece 2; it should be noted that the intermediate section 11 and the connecting section 12 are coaxial, that is, the outer wall shape of the longitudinal section of the connecting section 12 is the same as the longitudinal section structure of the intermediate section 11, both of which are circular.

[0022] It can be explained that the middle section 11 and the connecting section 12 are integrally formed. In order to improve the overall structural strength, the inner diameter of the middle section 11 is smaller than the inner diameter of the connecting section 12.

[0023] In the specific implementation process, see Figure 1 、 Figure 4 、 Figure 5 The connecting member 2 is a hollow tubular structure, and the longitudinal section of one end of the connecting member 2 is a regular polygonal structure (such as a regular octagon), so as to be adapted and fixed in the end of the connecting section 12 whose longitudinal section is a regular polygonal structure, so as to improve the reliability and connection efficiency of the connection between the connecting section 12 and the connecting member 2.

[0024] To improve the stability of the connection, see Figure 4 、 Figure 5 A raised abutment 21 is provided along the circumferential outer surface of the connecting member 2 to abut against the end face opposite to the shaft tube body 1; it should be noted that the longitudinal cross-section of the abutment 21 is circular and is coaxially arranged with the connecting member 2, so as to facilitate the connection of the end of the connecting member 2 away from the shaft tube body 1 with other metal parts, such as a spline sleeve, a universal joint fork, etc.

[0025] In order to further improve the stability of the connection between the connector 2 and the shaft tube body 1, the outer surface of the regular polygonal structure of the connector 2 is provided with an adhesive layer (not shown in the figure). It should be noted that the adhesive layer can be a coated adhesive.

[0026] Example 2 To facilitate processing while improving connection reliability and connection efficiency, this embodiment provides a method for preparing a shaft tube, that is, preparing the shaft tube assembly as described in Example 1, comprising the following steps: S1. Prepare a shaft tube body 1 and a connector 2, wherein the shaft tube body 1 is made of carbon fiber and the connector 2 is made of metal; In step S1, the longitudinal cross-section structure of the inner wall at both ends of the shaft tube body 1 is processed into a regular polygon with N sides; The longitudinal section structure of one end of the connecting member 2 is processed into a regular polygon with N sides, and the longitudinal section structure of the other end of the connecting member 2 is processed into a circular ring; A raised abutting portion 21 is processed along the outer surface of the connector 2 in the circumferential direction, so that the abutting portion 21 abuts against the opposite end surface of the shaft tube body 1 .

[0027] S2, applying adhesive to the outer surface of one end of the connector 2; In step S2, the outer surface of one end of the regular polygon provided on the connecting member 2 is coated with adhesive.

[0028] S3. Connect the connectors 2 at both ends of the shaft tube body 1, and insert one end of the connector 2 coated with adhesive into the shaft tube body 1, leaving the other end of the connector 2 exposed outside the shaft tube body 1. Drill holes at both ends of the shaft tube body 1, and rivet the shaft tube body 1 and the connector 2 together with the rivet 3 to form a shaft tube assembly. In step S3 , when drilling holes at both ends of the shaft tube body 1 , the connector 2 is provided below the drilling position, so that the shaft tube body 1 and the connector 2 are simultaneously drilled and fixed by rivets 3 .

[0029] In order to facilitate firm welding with other metal parts, the end of the connecting piece that is not provided with a regular octagon is provided with a chamfer, and the angle α between the chamfer and the vertical line is 25-35°, preferably 30°.

[0030] In this preparation method, the shaft tube body 1 is made of carbon fiber material, which achieves lightweighting of the shaft tube; metal connectors 2 are provided at both ends of the shaft tube body 1 to achieve welding of the shaft tube assembly and the metal parts without affecting the dynamic balancing process, creating conditions for mass production of transmission shafts for automobiles; During the preparation of the shaft tube body 1 and the connector 2, the regular octagonal structure and position design improve the reliability and efficiency of the connection between the shaft tube body 1 and the connector 2. The connection between the two can be achieved by simply inserting the end of the connector 2 with the regular octagon into the end of the shaft tube body 1 with the regular octagon. In addition, to strengthen the firmness of the connection between the two, a layer of adhesive is first applied to the outer surface of the regular octagon of the connector 2 before the connector 2 is inserted into the shaft tube body 1. The use of the method of this embodiment to prepare the shaft tube assembly effectively solves the technical problems of connection reliability and connection efficiency between carbon fiber materials and metal materials, and facilitates mass production.

[0031] Example 3 This embodiment provides a transmission shaft, see Figure 6 , including the shaft tube assembly as described in Example 1, metal parts such as spline sleeves, universal joint forks, etc. can be directly welded at both ends of the shaft tube assembly to prepare a drive shaft, which improves production efficiency without affecting the dynamic balancing process and realizes mass production of the drive shaft.

[0032] It should be noted that, in the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0033] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0034] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. Axle tube assembly, characterized in that: It comprises an axle tube body (1) and a connecting piece (2); Both ends of the shaft tube body (1) are coaxially connected to the connecting piece (2), and the shaft tube body (1) is made of carbon fiber material, and the connecting piece (2) is made of metal material.

2. The shaft tube assembly according to claim 1, characterized in that: The shaft tube body (1) comprises a middle section (11) and a connecting section (12); The connecting sections (12) are symmetrically provided at both ends of the middle section (11), and the longitudinal section of the inner wall of the connecting section (12) is constructed as a regular polygonal structure to transitionally match the connecting piece (2).

3. The shaft tube assembly according to claim 2, characterized in that: The connecting piece (2) is a hollow tubular structure, and the longitudinal section of one end of the connecting piece (2) is configured as a regular polygonal structure, so as to be adapted and fixed in the end of the connecting section (12) whose longitudinal section is configured as a regular polygon.

4. The shaft tube assembly according to claim 3, characterized in that: A raised abutment portion (21) is provided along the circumferential outer surface of the connecting member (2) to abut against the end surface opposite to the shaft tube body (1).

5. The shaft tube assembly according to claim 2, characterized in that: The inner diameter of the middle section (11) is smaller than the inner diameter of the connecting section (12).

6. A method for preparing an axle tube assembly, characterized in that: The steps include: S1. Prepare a shaft tube body (1) and a connecting piece (2), wherein the shaft tube body (1) is made of carbon fiber material, and the connecting piece (2) is made of metal material; S2, applying adhesive to the outer surface of one end of the connecting member (2); S3. Connecting the connecting pieces (2) at both ends of the shaft tube body (1) is performed, and one end of the connecting piece (2) coated with adhesive is inserted into the shaft tube body (1), and the other end of the connecting piece (2) is exposed from the shaft tube body (1); then, holes are drilled at both ends of the shaft tube body (1), and the shaft tube body (1) and the connecting piece (2) are riveted and fixed by rivets (3) to form a shaft tube assembly.

7. The method according to claim 6, characterized in that In step S1, the longitudinal cross-section structure of the inner wall at both ends of the shaft tube body (1) is processed into a regular polygon with N sides; The longitudinal section structure of one end of the connecting member (2) is processed into a regular polygon with N sides, and the longitudinal section structure of the other end of the connecting member (2) is processed into a circular ring; A raised abutment portion (21) is machined along the circumferential outer surface of the connecting piece (2), so that the abutment portion (21) abuts against the end surface opposite to the shaft tube body (1).

8. The method according to claim 7, characterized in that In step S2, the outer surface of one end of the regular polygon processed on the connecting member (2) is coated with adhesive.

9. The method according to claim 7, characterized in that In step S3, when drilling holes at both ends of the shaft tube body (1), the connecting piece (2) is provided below the drilling position, so that holes are drilled on the shaft tube body (1) and the connecting piece (2) at the same time and then connected and fixed by a rivet (3).

10. A transmission shaft, characterized in that: The invention comprises the shaft tube assembly as described in any one of claims 1 to 5.

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