Connecting shaft assembling structure

Abstract

The utility model discloses a connecting shaft assembling structure which comprises a connecting shaft and a connecting base, and a shaft hole for installing the connecting shaft is formed in the connecting base. The connecting shaft is of a two-section structure and comprises a perfect circle section section and a non-perfect circle section section which are coaxial, and the diameter of the perfect circle section section is larger than the transverse size of the non-perfect circle section section. The shaft hole is of a two-section structure and comprises a first hole section and a second hole section which are coaxial, the cross section of the first hole section is a perfect circle matched with the perfect circle section, and the cross section of the second hole section is a non-perfect circle section matched with the non-perfect circle section. By adopting the two-section type shaft hole connecting structure, the non-perfect circle section section of the connecting shaft is responsible for transmitting torque, and the perfect circle section section of the connecting shaft is responsible for resisting bending or lateral force, so that the shaft hole connecting structure can be effectively ensured to be better assembled and transmit torque, and has good lateral force resistance; in the torque transmission process, vibration is not prone to being generated, and stability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a connecting shaft assembly structure. Background Art

[0002] In the process of mechanical transmission, the connection between shaft and hole is the key link to achieve torque transmission. At present, the commonly used shaft-hole connection methods include flat keys, splines, pins, involute splines, interference joints, etc. However, these connection methods have certain limitations in practical applications, such as inconvenient assembly, difficult processing, stress concentration, etc., resulting in poor torque transmission effect. Therefore, it is necessary to design a new shaft-hole connection method to improve the shortcomings of the existing technology.

[0003] In view of this, my country's patent CN218992162U discloses a connection structure between a transmission shaft and a synchronous wheel and a filter cartridge dust removal device having the same, including a transmission shaft and a synchronous wheel; a mounting hole is opened in the middle of the synchronous wheel, and the cross section of the mounting hole has a non-circular shape; the transmission shaft includes a transmission shaft body, one end of the transmission shaft body extends axially outward to form a mounting shaft section, and the outer peripheral shape of the mounting shaft section is adapted to the shape of the mounting hole; the mounting shaft section is inserted and fixed in the mounting hole. The utility model can quickly plug and fix the transmission shaft and the synchronous wheel, without the need for hole alignment and locking steps, effectively improving work efficiency, and avoiding relative rotation between the mounting shaft section and the synchronous wheel, effectively ensuring that the mounting shaft section rotates with the rotation of the synchronous wheel, improving the reliability of the transmission, thereby improving the reliability of the entire device, and its technical solution involves a non-circular cross-section shaft hole connection method.

[0004] Another example is my country's patent CN205533819U, which discloses a triangular shaft connection structure, including a wheel hub and a connecting shaft, wherein the wheel hub has a shaft hole, and the connecting shaft is installed in the shaft hole; the connecting shaft is a structure having a triangular shaft, and the shaft hole is a triangular structure matching the triangular shaft, and the connecting shaft is inserted into the triangular shaft hole through its triangular shaft and fixedly connected to the wheel hub. The utility model eliminates the traditional key installation method through the triangular shaft hole connection structure of the triangular shaft and the wheel hub, thereby avoiding damage caused by key breakage and keyway deformation due to metal fatigue or overload factors, etc., which is not only more solid, safe and reliable in structure, but also more convenient to install and maintain, and the triangular shaft is simpler to manufacture and has lower cost.

[0005] However, the prior art only considers solving the problem of torque transmission by connecting the non-circular cross-section shaft and the shaft hole. In mechanical structures, there is generally not only torque but also lateral force at the shaft hole connection node, such as the shaft hole connection structure on the wheel. The non-circular cross-section shaft hole connection has uneven bending or lateral force resistance in all lateral directions. It is easy to generate large vibrations under the action of lateral force while transmitting torque. Therefore, while considering torque transmission, it is also necessary to consider the bending and lateral force resistance of the connecting shaft. However, the prior art does not take into account the disadvantages of the non-circular cross-section shaft hole connection compared to the circular cross-section shaft hole connection in resisting lateral force. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a connecting shaft assembly structure to solve the problem that the non-circular cross-section shaft hole connection structure in the prior art has uneven lateral strength and is prone to vibration during torque transmission.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a connecting shaft assembly structure, including a connecting shaft and a connecting seat, an axial hole for installing the connecting shaft is provided on the connecting seat; the connecting shaft is a two-section structure, which includes a coaxial perfect circular cross-section segment and a non-perfect circular cross-section segment, and the diameter of the perfect circular cross-section segment is larger than the lateral dimension of the non-perfect circular cross-section segment; the axial hole is a two-section structure, which includes a coaxial first hole segment and a second hole segment, wherein the cross-section of the first hole segment is a perfect circle matching the perfect circular cross-section segment, and the cross-section of the second hole segment is a non-perfect circular cross-section matching the non-perfect circular cross-section segment.

[0008] As an optimization, the cross section of the non-circular cross section segment is polygonal.

[0009] As an optimization, the cross section of the non-circular cross section segment is triangular.

[0010] As an optimization, an arc-shaped transition structure is provided at each vertex of the non-circular cross-section segment.

[0011] As an optimization, each side surface of the non-circular cross-section segment is an outwardly convex arc surface structure.

[0012] Compared with the prior art, the utility model has the following advantages: by adopting a two-section shaft-hole connection structure, the non-circular cross-section section of the connecting shaft is responsible for transmitting torque, and the circular cross-section section is responsible for resisting bending or lateral force, thereby effectively ensuring that the shaft-hole connection structure can be better assembled, better transmit torque, and has good lateral force resistance performance, is not easy to generate vibration during torque transmission, and has better stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the assembly structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the connecting shaft in the utility model;

[0015] In the figure: 1 is a perfect circular cross-section segment, 2 is a non-perfect circular cross-section segment, 3 is a first hole segment, 4 is a second hole segment, and 5 is an arc-shaped transition structure. DETAILED DESCRIPTION

[0016] The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Example: See Figure 1 to Figure 2, a connecting shaft assembly structure, including a connecting shaft and a connecting seat, wherein an axial hole for mounting the connecting shaft is provided on the connecting seat; the connecting shaft is a two-section structure, including a coaxial perfect circular section section 1 and a non-perfect circular section section 2, and the diameter of the perfect circular section section 1 is larger than the transverse dimension of the non-perfect circular section section 2; the axial hole is a two-section structure, including a coaxial first hole section 3 and a second hole section 4, wherein the cross section of the first hole section 3 is a perfect circle matching the perfect circular section section 1, and the cross section of the second hole section 4 is a non-perfect circular section matching the non-perfect circular section section 2. Through the cooperation between the non-perfect circular section section 2 and the second hole section 4, the assembly can be better realized, the assembly difficulty of the traditional perfect circular connecting shaft using the key connection method is reduced, and the assembly efficiency is improved. At the same time, the cooperation between the non-perfect circular section section 2 and the second hole section 4 enables the entire non-perfect circular section to form a large range of torque transmission, which improves the efficiency of torque transmission. Compared with the traditional key connection method that only relies on the key to transmit torque, it has better stability and transmission efficiency, and prolongs the service life of the connecting shaft. In addition, through the cooperation between the perfect circular cross-section segment 1 and the first hole segment 3, the perfect circular cross-section segment 1 can better resist lateral forces, the non-perfect circular cross-section segment 2 is only responsible for transmitting torque, and the bending or lateral strength of the perfect circular cross-section segment 1 in all directions is consistent, thereby ensuring the stability of resisting lateral forces, making it less likely to generate vibration during the torque transmission process, and having better stability.

[0020] The cross section of the non-circular cross-section segment 2 is polygonal, and may be in various forms such as triangle, rectangle, hexagon, etc., and may also be in an ellipse or other form.

[0021] Specifically, in this embodiment, the cross-section of the non-circular cross-section segment 2 is triangular, and an arc-shaped transition structure 5 is provided at each vertex of the non-circular cross-section segment 2 to eliminate stress concentration. Furthermore, each side surface of the non-circular cross-section segment 2 is an outwardly convex arc surface structure, so that the cross-sectional shape of the non-circular cross-section segment 2 is composed of multiple arcs, which is smoother while being triangular as a whole, further eliminating stress concentration, so that its cross-sectional area can be expanded as much as possible while ensuring good assembly performance and torque transmission, thereby ensuring its torsional strength and stability.

[0022] The utility model adopts a two-section shaft-hole connection structure, so that the non-circular cross-section section of the connecting shaft is responsible for transmitting torque, and the circular cross-section section is responsible for resisting bending or lateral force, thereby effectively ensuring that the shaft-hole connection structure can be better assembled, better transmit torque, and has good lateral force resistance performance, is not easy to generate vibration during torque transmission, and has better stability.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.

Claims

1. A connecting shaft assembly structure, comprising a connecting shaft and a connecting seat, wherein the connecting seat is provided with an axial hole for mounting the connecting shaft; characterized in that: The connecting shaft is a two-section structure, which includes a coaxial perfect circular cross-section section and a non-perfect circular cross-section section, and the diameter of the perfect circular cross-section section is larger than the maximum lateral dimension of the non-perfect circular cross-section section; the axial hole is a two-section structure, which includes a coaxial first hole section and a second hole section, wherein the cross-section of the first hole section is a perfect circle matching the perfect circular cross-section section, and the cross-section of the second hole section is a non-perfect circular cross-section matching the non-perfect circular cross-section section.

2. A connecting shaft assembly structure according to claim 1, characterized in that: The cross section of the non-circular cross section segment is polygonal.

3. A connecting shaft assembly structure according to claim 2, characterized in that: The cross section of the non-circular cross section segment is triangular.

4. A connecting shaft assembly structure according to claim 2 or 3, characterized in that: An arc-shaped transition structure is provided at each vertex of the non-circular cross-section segment.

5. The connecting shaft assembly structure according to claim 4, characterized in that: Each side surface of the non-circular cross-section segment is an outwardly convex arc surface structure.

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