Anti-falling structure for connecting shafts

Abstract

This utility model discloses an anti-detachment structure for a connecting shaft, including a connecting shaft and a limiting ring disposed at the end of the connecting shaft. The connecting shaft includes a connecting body, a limiting terminal is provided at one end of the connecting body, and a limiting step is provided at the other end of the connecting body. An installation groove is provided between the limiting step and the connecting body. The limiting ring is disposed in the installation groove and is prevented from detaching by the limiting step. This utility model replaces the traditional threaded connection method with the matching structure of the limiting ring and the installation groove. After the connecting shaft is installed in place, the limiting ring is eccentrically positioned under its own gravity, thereby preventing the connecting shaft from detaching from the mounting hole.

Description

Technical Field

[0001] This application relates to the field of mechanical connection technology, and more specifically, to an anti-detachment structure for connecting shafts and a connection method thereof. Background Technology

[0002] In the field of mechanical assembly, connecting shafts are common transmission components, typically requiring them to pass through shaft holes in workpieces for fixation. Traditional connecting shaft structures have significant technical drawbacks: while one end is limited by a built-in limiting terminal, the other end must be fixed using a threaded connection with a nut. This fixing method is not only cumbersome and time-consuming to install, but also presents numerous problems in practical use. The nut, as a separate part, is easily lost during transportation or use, leading to connection failure; threaded connections are prone to loosening under long-term vibration, posing a risk of detachment; thread machining increases manufacturing costs, and specialized tools are required for tightening during installation.

[0003] Furthermore, when the connecting shaft needs to be frequently disassembled and reassembled, the threaded structure is more prone to wear, further reducing the reliability of the connection. These problems seriously affect the operational stability and maintenance convenience of mechanical equipment.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this invention is to provide an anti-detachment structure for connecting shafts to solve the problems existing in the prior art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A structure for preventing a connecting shaft from falling off includes a connecting shaft and a limiting ring disposed at the end of the connecting shaft;

[0008] The connecting shaft includes a connecting body, a limiting terminal is provided at one end of the connecting body, a limiting step is provided at the other end of the connecting body, and an installation groove is provided between the limiting step and the connecting body;

[0009] The limiting ring is installed in the mounting groove and is prevented from falling out by the limiting step.

[0010] Furthermore, the main body of the limiting ring is an elliptical structure; the minor axis of the inner hole of the limiting ring is smaller than the diameter of the limiting step, which is used to prevent the limiting ring from coming out; the major axis of the outer circle of the limiting ring is smaller than the diameter of the connecting body, which is used to prevent the limiting ring from affecting the connecting shaft passing through the workpiece.

[0011] Furthermore, the workpiece has a shaft hole, and a bushing is provided in the shaft hole. The outer circumferential surface of the bushing contacts the shaft hole, and the inner circumferential surface of the bushing contacts the connecting shaft.

[0012] Furthermore, the connecting body, limiting terminal, limiting step, and mounting groove are connected by an integrated structure.

[0013] In summary, this utility model has the following beneficial effects:

[0014] By replacing the traditional threaded connection with a matching structure of a limiting ring and a mounting groove, the limiting ring is eccentrically positioned under its own gravity after the connecting shaft is installed in place, thereby preventing the connecting shaft from coming out of the mounting hole. This solves the problems of cumbersome threaded installation, easy loss of parts, and vibration loosening. It has the advantages of simplifying the installation process, avoiding loss of parts, improving vibration resistance and stability, and reducing manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the anti-detachment structure for connecting shafts described in this utility model.

[0016] Figure 2 This is a schematic diagram of the connecting shaft described in this utility model.

[0017] Figure 3 This is a schematic diagram of the limiting ring described in this utility model.

[0018] Figure 4 This is a schematic diagram of the connection between the connecting shaft and the workpiece described in this utility model.

[0019] Figure 5 This is an exploded view of the connection between the connecting shaft and the workpiece described in this utility model. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with the illustrations and specific embodiments.

[0021] like Figures 1 to 5 As shown, the present invention proposes an anti-detachment structure for a connecting shaft, including a connecting shaft 1 and a limiting ring 2 disposed at the end of the connecting shaft 1.

[0022] The connecting shaft 1 includes a connecting body 11, a limiting terminal 12 is provided at one end of the connecting body 11, a limiting step 13 is provided at the other end of the connecting body 11, and an installation groove 14 is provided between the limiting step 13 and the connecting body 11; the limiting ring 2 is provided in the installation groove 14 and is prevented from falling out by the limiting step 13.

[0023] The connecting body 11 refers to a hollow or solid shaft that bears the main force transmission function. The limiting terminal 12 refers to a flange structure located at the end of the shaft, which can be implemented as an annular boss, used to prevent axial displacement of the connecting shaft 1 on the workpiece 3 side. The limiting step 13 refers to an annular platform with a sudden change in diameter at the end of the shaft, which can be formed by machining, with its outer diameter larger than the size of the mounting groove 14 to form a stepped structure for axial obstruction. The mounting groove 14 refers to an annular recessed area formed on the surface of the shaft, which can be machined by turning, and its depth is configured to accommodate the thickness of the limiting ring 2.

[0024] Specifically, when the connecting shaft 1 passes through the shaft hole 31 of the workpiece 3, the limiting terminal 12 abuts against one side surface of the workpiece 3. After the limiting ring 2 is pressed into the mounting groove 14, the annular end face of the limiting step 13 forms a physical barrier. Under axial load, the limiting ring 2 is confined within the space formed by the mounting groove 14 and the limiting step 13. Because the outer diameter of the limiting step 13 is larger than the width of the short shaft of the limiting ring 2, the limiting ring 2 cannot detach from the connecting shaft 1 axially. This structure forms the limit through the geometric features of the shaft itself, eliminating the need to machine a threaded structure at the end of the shaft.

[0025] Through the above technical solution, this application solves the problems of complex assembly and easy loosening existing in traditional threaded fastening methods. The limiting step 13 and the mounting groove 14 can effectively constrain the axial displacement of the limiting ring 2, ensuring the stability of the connecting shaft 1 under long-term vibration conditions. Since there is no need to use independent parts such as nuts, the risk of fastener loss is avoided, and the cost of parts processing and inventory management is reduced.

[0026] This application further proposes that the main body of the limiting ring 2 is an elliptical structure, and the minor axis of the limiting ring 2 is smaller than the diameter of the limiting step 13. In this application, the limiting ring 2 is initially a circular structure, and after being fitted into the mounting groove 14, it is processed into an elliptical structure by tooling.

[0027] The elliptical structure refers to the cross-sectional shape of the limiting ring 2 having a major axis and a minor axis. The minor axis being smaller than the diameter of the limiting step 13 means that the maximum extension dimension of the limiting ring 2 in the minor axis direction is less than the outer diameter of the limiting step 13, preventing the limiting ring 2 from crossing the radial boundary of the limiting step 13 in the minor axis direction. The maximum extension dimension of the limiting ring 2 in the major axis direction is smaller than the dimension of the connecting body 11, ensuring that the limiting ring 2 can also pass through the workpiece 3 when the connecting shaft 1 passes through it.

[0028] Specifically, when the connecting shaft 1 passes through the workpiece 3, the major axis of the limiting ring 2 is aligned with the axial direction of the connecting shaft 1, and both can pass through the shaft hole 31 of the workpiece 3 simultaneously. After the connecting shaft 1 is installed, the limiting ring 2 cannot be dislodged from the mounting groove 14 in the minor axis direction due to size limitations. At this time, the limiting step 13 forms a rigid barrier, preventing the limiting ring 2 from moving axially. Through the dual-axis differentiated design of the elliptical structure, the limiting ring 2 achieves reliable constraint during axial movement.

[0029] Compared to existing technologies, traditional nut structures rely on threaded connections and manual tightening, resulting in low assembly efficiency and a tendency to loosen. The elliptical limiting ring 2, through geometric optimization, achieves a self-locking function without the need for additional fasteners. Existing technologies, such as annular washers or snap rings, can only restrict displacement in one direction, failing to simultaneously address assembly smoothness and anti-loosening requirements. The elliptical structure, through the synergistic effect of its major and minor axes, integrates both dynamic avoidance and static limiting functions into a single component.

[0030] Through the above technical solution, this application resolves the contradiction between preventing the connecting shaft 1 from detaching and preventing assembly interference when it passes through the workpiece 3. The short-axis constraint of the limiting ring 2 effectively prevents the connecting shaft 1 from detaching in the reverse direction. This solution eliminates the need for threaded fittings or auxiliary tools, simplifies the installation process, reduces the probability of part loss, and improves the long-term stability of the connection structure through a geometric self-locking mechanism.

[0031] This application further proposes to provide a bushing 32 in the shaft hole 31 of the workpiece 3, with the outer circumferential surface of the bushing 32 in contact with the shaft hole 31 and the inner circumferential surface of the bushing 32 in contact with the connecting shaft 1.

[0032] The shaft hole 31 refers to a through hole opened on the workpiece 3 for the connecting shaft 1 to pass through. It can be formed by machining and is used to accommodate the bushing 32 and realize the connection between the connecting shaft 1 and the workpiece 3. The bushing 32 is an annular component fitted inside the shaft hole 31. It achieves a fixed connection with the workpiece 3 through an interference fit between its outer circumferential surface and the shaft hole 31, and allows the connecting shaft 1 to move axially within the bushing 32 by reserving an assembly clearance.

[0033] Compared with existing technologies, traditional solutions require machining threads and installing nuts at the end of the connecting shaft 1, which not only increases the number of parts and assembly steps but also poses a risk of the nut loosening and falling off. This solution, through a combination of interference fit and clearance fit in the bushing 32, achieves axial limiting and radial constraint of the connecting shaft 1 without the need for additional fasteners.

[0034] Through the above technical solution, this application solves the problems of complex installation steps, easy loss of nuts, and loose connection caused by traditional threaded structures. The fixing method of bushing 32 avoids the thread machining and nut installation steps, simplifying the assembly process; the combination of the interference fit bushing 32 and the clearance fit connecting shaft 1 ensures connection stability while allowing free axial movement.

[0035] This application further proposes that the connecting body 11, the limiting terminal 12, the limiting step 13, and the mounting groove 14 are connected by an integrated structure.

[0036] Specifically, during the manufacturing process of the connecting shaft 1, the connecting body 11, the limiting terminal 12, the limiting step 13, and the mounting groove 14 are integrally machined, creating a continuous structure with no assembly errors between the components. The joint between the limiting terminal 12 and the connecting body 11 is directly formed from the material itself, achieving axial limiting without the need for additional fasteners. The integral molding of the limiting step 13 and the mounting groove 14 ensures the relative positional accuracy of the two, allowing the limiting ring 2 to be precisely engaged in the predetermined position during installation. This integral structure avoids the need for separate components such as nuts and washers required in traditional threaded connections, while also eliminating the mating clearance caused by thread wear.

[0037] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", and "horizontal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of clarifying the technical solution and for the convenience of description, and therefore should not be construed as limiting the present utility model.

[0038] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A structure for preventing detachment of a connecting shaft, characterized in that, It includes a connecting shaft (1) and a limiting ring (2) disposed at the end of the connecting shaft (1); The connecting shaft (1) includes a connecting body (11), a limiting terminal (12) is provided at one end of the connecting body (11), a limiting step (13) is provided at the other end of the connecting body (11), and an installation groove (14) is provided between the limiting step (13) and the connecting body (11). The limiting ring (2) is set in the mounting groove (14) and is prevented from falling out by the limiting step (13).

2. The anti-detachment structure for connecting shafts according to claim 1, characterized in that, The main body of the limiting ring (2) is an elliptical structure; the short axis of the inner hole of the limiting ring (2) is smaller than the diameter of the limiting step (13) to prevent the limiting ring (2) from coming out; the long axis of the outer circle of the limiting ring (2) is smaller than the diameter of the connecting body (11) to prevent the limiting ring (2) from affecting the connecting shaft (1) from passing through the workpiece (3).

3. The anti-detachment structure for connecting shafts according to claim 2, characterized in that, The workpiece (3) has a shaft hole (31) and a bushing (32) is provided in the shaft hole (31). The outer circumferential surface of the bushing (32) is in contact with the shaft hole (31), and the inner circumferential surface of the bushing (32) is in contact with the connecting shaft (1).

4. The anti-detachment structure for connecting shafts according to claim 3, characterized in that, The connecting body (11), limiting terminal (12), limiting step (13) and mounting groove (14) are connected by an integrated structure.

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