A joint

Abstract

This utility model provides a connector including a sleeve, an inner conical nut, a connecting rod, and a spring. The sleeve has an internal cavity comprising a conical section and a cylindrical section. The inner conical nut is located within the cylindrical section, and its inner wall has an arc-shaped groove. The connecting rod includes a mating section and a guide section at the end of the mating section. The outer circumference of the mating section has a limiting ring that mates with the arc-shaped groove. The spring is installed between the bottom of the sleeve and the lower end face of the inner conical nut. The engagement of the limiting ring and the arc-shaped groove forms a rotating pair, allowing the connecting rod to rotate around its own axis, providing basic rotational functionality. The engagement of the guide section and the conical section of the sleeve constitutes a guiding system, enabling rapid alignment and assembly, effectively reducing installation accuracy requirements. This design achieves rapid installation and basic rotational functionality of the connector, solving the problems of complex assembly and limited rotational freedom in traditional connection structures.

Description

Technical Field

[0001] This utility model relates to the field of mechanical connection technology, and in particular to a connector. Background Technology

[0002] Currently, in the field of mechanical transmission and connection, for working conditions with alignment errors or requiring compensation for runout, the mainstream solutions are ball joints, flexible couplings, or complex slider mechanisms. While ball joints can provide multi-degree-of-freedom rotation, they are expensive to manufacture, have limited load-bearing capacity, and exhibit clearance issues under certain conditions. Flexible couplings can compensate for some deviations, but their torsional stiffness is usually low, making them unsuitable for applications requiring precise transmission. Slider mechanisms, on the other hand, are often complex in structure, occupy a large space, and require specialized lubrication and maintenance.

[0003] Most existing joint structures can only provide limited compensation capabilities, making it difficult to simultaneously meet the multiple requirements of high load-bearing capacity, high precision, automatic alignment, and compact structure. Especially in equipment connection applications with heavy loads, high speeds, or high precision requirements (such as industrial robot joints, precision transmission systems, and heavy machinery connections), traditional connection methods often require improving the machining and assembly precision of parts to ensure performance. This not only significantly increases manufacturing costs but also places higher demands on use and maintenance.

[0004] Therefore, there is an urgent need for a new type of joint device that can simultaneously possess automatic centering, sway and rotation angle compensation, high load-bearing capacity and compact structure, in order to solve the problems of complex structure, insufficient centering and angle compensation capabilities and high manufacturing cost in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a connector that forms a rotating pair through the cooperation of a limiting ring and an arc-shaped groove, allowing the connecting rod to rotate around its own axis and providing basic rotational functionality. A guiding system is formed through the cooperation of a guide section and a sleeve conical section, enabling rapid alignment and assembly, effectively reducing installation accuracy requirements. This invention achieves rapid installation and basic rotational functionality, solving the problems of complex assembly and limited rotational freedom in traditional connection structures.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: This utility model provides a connector, comprising: A sleeve, wherein a cavity is provided inside the sleeve, and the cavity includes a conical section and a cylindrical section; An inner conical nut is disposed inside the cylindrical section, and an arc-shaped groove is provided on the inner wall of the inner conical nut; The connecting rod includes a mating section and a guide section located at the end of the mating section, wherein the outer peripheral surface of the mating section is provided with a limiting ring that mates with the arc-shaped groove; A spring is installed between the bottom of the sleeve and the lower end face of the inner conical nut.

[0007] Furthermore, the outer wall of the inner conical nut is clearance-fitted with the inner wall of the cylindrical section of the sleeve, allowing the inner conical nut to float radially within the sleeve.

[0008] Furthermore, the bottom of the inner conical nut is provided with an inwardly protruding limiting protrusion, and the spring is installed between the bottom of the sleeve and the limiting protrusion.

[0009] Furthermore, the inner diameter of the limiting protrusion is larger than the outer diameter of the guide section in the connecting rod.

[0010] Furthermore, the inner diameter of the limiting protrusion is smaller than the outer diameter of the limiting ring.

[0011] Furthermore, the inner wall of the inner conical nut is provided with a row of arc-shaped grooves arranged along the axial direction.

[0012] Furthermore, the connecting rod has a row of limiting rings that cooperate with the arc-shaped groove on the mating section.

[0013] Furthermore, the connecting rod also includes a transition section located between the mating section and the connecting rod body, the diameter of which is smaller than the diameter of the mating section.

[0014] Furthermore, the guide section has a frustum-shaped structure, and its outer diameter gradually increases from the end towards the mating section.

[0015] Furthermore, the cross-sectional shape of the limiting ring is an arc shape.

[0016] The connector provided by this utility model achieves the function of a rotating pair through the cooperation structure of a limiting ring and an arc-shaped groove. Combined with the floating design of the inner conical nut, it can simultaneously realize multi-directional angle compensation and automatic alignment functions within a single compact structure. Specifically, the curved surface contact between the limiting ring and the arc-shaped groove effectively disperses contact stress, improving the connector's service life. The adaptive floating of the inner conical nut within the sleeve automatically compensates for radial deviations during installation, reducing the requirements for installation accuracy. The spring preload ensures continuous contact pressure and an automatic reset function, allowing the connector to automatically return to its aligned state after being deflected by external force. This integrated design solves the problem of angle compensation and alignment functions that traditional connection devices require multiple components to achieve, significantly improving connection reliability and service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the connector provided in one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the combined structure of the sleeve and the inner conical nut provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the connecting rod provided in one embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the inner conical nut provided in an embodiment of the present invention.

[0022] In the diagram: 1. Connecting rod; 11. Guide section; 12. Mating section; 13. Limiting ring; 14. Transition section; 2. Sleeve; 20. Cavity; 21. Conical section; 22. Cylindrical section; 3. Inner conical nut; 31. Arc-shaped groove; 32. Limiting protrusion; 4. Spring. Detailed Implementation

[0023] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when this utility model is in use. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar attributes, not to indicate or imply relative importance or a specific order.

[0026] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0027] like Figures 1 to 4 As shown, this utility model provides a connector, which includes a connecting rod 1, a sleeve 2, an inner conical nut 3, and a spring 4. The sleeve 2 is a cylindrical part with a cavity 20 inside, divided into a conical section 21 with an upper end of 60° and a cylindrical section 22 with a lower end. The inner conical nut 3 is placed inside the cylindrical section 22 of the sleeve 2, with a small gap between its outer wall and the inner wall of the sleeve 2, allowing the inner conical nut 3 to move slightly left and right within the sleeve 2. The inner conical nut 3 has a row of arc-shaped grooves 31 arranged axially inside, these grooves are of the same shape and size and are evenly spaced. The lower end of the inner conical nut 3 has an inwardly protruding limiting protrusion 32, the inner diameter of which is smaller than the diameter of the upper arc-shaped groove 31. The spring 4 is installed between the bottom of the sleeve 2 and the lower end face of the inner conical nut 3, and is in a compressed state in its natural state, always pushing the inner conical nut 3 upward.

[0028] Connecting rod 1 is the core transmission component of this invention, with its middle section being a cylindrical transition section 14 with a smaller diameter. Both ends of the transition section 14 are connected to mating sections 12 with larger diameters. A row of limiting rings 13, corresponding to the arc-shaped grooves 31 of the inner conical nut 3, is machined on the outer circumference of the mating section 12. The cross-sections of these limiting rings 13 are all arc-shaped and precisely match the arc-shaped grooves 31. The end of the mating section 12 is a guide section 11, which is frustum-shaped, with its diameter gradually increasing from the end towards the mating section 12.

[0029] The guide section 11 of the connecting rod 1 and the 60° conical section 21 at the upper end of the sleeve 2 together form a guiding system. During installation, this guiding system can automatically guide the connecting rod 1 to smoothly insert into the sleeve 2, and can automatically correct any initial position deviations, enabling assembly to be completed without the use of special tools.

[0030] During operation, a row of limiting rings 13 on the mating section 12 of the connecting rod 1 engages with a row of arc-shaped grooves 31 within the inner conical nut 3, forming a rotational fit. This multi-stage fit allows the connecting rod 1 to rotate around its own axis, which is the first rotational degree of freedom. The arc-shaped surfaces of multiple limiting rings 13 simultaneously form surface contact with the corresponding arc-shaped grooves 31, significantly increasing the contact area, more effectively distributing the force, reducing wear at individual contact points, and thus greatly extending the service life of the joint.

[0031] To achieve the angle adjustment function in three-dimensional space, this utility model adopts a special floating design. When the upper end of the connecting rod 1 is subjected to a lateral force and deflects, the rotating pair formed by the limiting ring 13 and the arc-shaped groove 31 restricts the radial movement of the connecting rod 1 relative to the inner conical nut 3. The deflection of the connecting rod 1 will force the entire inner conical nut 3 to produce a corresponding radial translation (i.e., floating) within the cylindrical section 22 of the sleeve 2, thereby compensating for the centering error.

[0032] Specifically, when the upper end of connecting rod 1 deflects to the left, the axis of connecting rod 1 forms an angle with the axis of sleeve 2. Since connecting rod 1 is radially locked to the inner conical nut 3 by the limiting ring 13, the inner conical nut 3 will move to the right within sleeve 2 to accommodate the tilting posture of connecting rod 1. The radial floating of the inner conical nut 3 causes the limiting protrusion 32 at its bottom to move together, thereby changing the relative position between the inner hole of the limiting protrusion 32 and the body of connecting rod 1 (especially the transition section 14). When the inner conical nut 3 moves to the right, the gap between the left side of the inner hole of the limiting protrusion 32 and the body of connecting rod 1 increases, providing the necessary space for the leftward deflection of the body of connecting rod 1 and avoiding interference.

[0033] Through the combined effect of the overall floating of the inner conical nut 3 and the clearance of the limiting protrusion 32, the connecting rod 1 gains a second rotational degree of freedom about a direction perpendicular to the axis. This degree of freedom, combined with the first rotational degree of freedom about its own axis, enables the joint to be angularly adjusted in three-dimensional space.

[0034] Due to the design of a series of limiting rings 13 and grooves, when bearing load, the force is distributed to multiple contact points, which greatly reduces the stress concentration at a single contact point, significantly improves the load-bearing capacity of the joint, and makes the movement process more stable.

[0035] The axial preload provided by spring 4 is used to: ensure that the limiting ring 13 and the arc-shaped groove 31 always maintain close contact and avoid gaps; provide restoring force for the radial floating of the inner conical nut 3, so that the joint has an automatic return function; and ensure that the connecting rod 1 can return to the centering state after deflection and maintain the stability of the connection.

[0036] The inner diameter of the limiting protrusion 32 at the bottom of the inner conical nut 3 is carefully designed. Its size is larger than the maximum diameter of the guide section 11 of the connecting rod 1 but smaller than the outer diameter of the lowest limiting ring 13 in the group of limiting rings 13. This design ensures that the connecting rod 1 can pass smoothly through the limiting protrusion 32 during installation, while the entire row of limiting rings 13 will not be pulled out during operation, providing a reliable safety guarantee for the joint and realizing the transmission of force in both tension and compression directions.

[0037] The transition section 14, located in the middle of the connecting rod 1, has a smaller diameter than the mating section 12. This gradual design avoids abrupt changes in cross-section, effectively prevents stress concentration, and ensures the structural strength of the connecting rod 1 when transmitting force.

[0038] The clearance between the cylindrical section 22 inside the sleeve 2 and the inner conical nut 3 is precisely calculated to ensure that the inner conical nut 3 has enough room to move to compensate for the centering error, while avoiding excessive clearance that could cause impact and noise during operation.

[0039] During assembly, first, place the spring 4 into the cylindrical section 22 at the bottom of the sleeve 2, then insert the inner conical nut 3 into the sleeve 2 and compress the spring 4. Next, insert the guide section 11 of the connecting rod 1 into the conical section 21 at the top of the sleeve 2. The guide section 11 passes through the arc-shaped groove 31 group and the bottom limiting protrusion 32 of the inner conical nut 3 in sequence, and continues to press down until the row of limiting rings 13 on the mating section 12 is completely engaged in the corresponding arc-shaped groove 31 of the inner conical nut 3.

[0040] During operation, when connecting rod 1 is subjected to outward tension, pressure is generated on the lower contact surface between the limiting ring 13 group and the arc-shaped groove 31 group, and the force is transmitted to sleeve 2 through the inner conical nut 3. When connecting rod 1 is subjected to inward pressure, pressure is generated on the upper contact surface between the limiting ring 13 group and the arc-shaped groove 31 group, and the force is also transmitted to sleeve 2 through the inner conical nut 3. This symmetrical path of force transmission through multiple contact surfaces ensures that the joint can transmit force more reliably and smoothly under both tension and compression.

[0041] When there is an alignment error between the two connected components, the connecting rod 1 will deflect accordingly. At this time, the alignment limiting ring 13 slides in coordination within the corresponding arc-shaped groove 31, the inner conical nut 3 moves within the sleeve 2, and the spring 4 deforms to provide restoring force. This series of coordinated actions enables the joint to automatically compensate for positional and angular deviations, greatly reducing the requirements for installation accuracy.

[0042] This invention achieves rapid installation, automatic alignment, and reliable force transmission of the joint through the coordinated operation of connecting rod 1, sleeve 2, inner conical nut 3, and spring 4. Specifically, the cooperation between the set of limiting rings 13 and the set of arc-shaped grooves 31 provides basic rotational functionality. Spatial angle adjustment is achieved through the radial floating of the inner conical nut 3 within the sleeve 2 and the synergistic effect of the step. The preload of spring 4 ensures self-alignment. The use of a series of limiting rings 13 in conjunction with the grooves significantly improves the load-bearing capacity and service life of this invention.

[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A joint, characterized by include: Sleeve (2), the sleeve (2) has a cavity (20) inside, the cavity (20) includes a conical section (21) and a cylindrical section (22); An inner conical nut (3) is provided inside the cylindrical section (22), and an arc-shaped groove (31) is provided on the inner wall of the inner conical nut (3). The connecting rod (1) includes a mating section (12) and a guide section (11) located at the end of the mating section (12). The outer peripheral surface of the mating section (12) is provided with a limiting ring (13) that mates with the arc-shaped groove (31). A spring (4) is installed between the bottom of the sleeve (2) and the lower end face of the inner conical nut (3).

2. The joint of claim 1, wherein The outer wall of the inner conical nut (3) is clearance-fitted with the inner wall of the cylindrical section (22) of the sleeve (2), so that the inner conical nut (3) can float radially within the sleeve (2).

3. The fitting of claim 1, wherein The bottom of the inner conical nut (3) is provided with an inwardly protruding limiting protrusion (32), and the spring (4) is installed between the bottom of the sleeve (2) and the limiting protrusion (32).

4. The joint of claim 3, wherein The inner diameter of the limiting protrusion (32) is larger than the outer diameter of the guide section (11) in the connecting rod (1).

5. The fitting of claim 3, wherein The inner diameter of the limiting protrusion (32) is smaller than the outer diameter of the limiting ring (13).

6. The fitting of claim 1, wherein The inner wall of the inner conical nut (3) is provided with a row of arc-shaped grooves (31) arranged along the axial direction.

7. The joint of claim 6, wherein, The connecting rod (1) has a row of limiting rings (13) on the mating section (12) that mate with the arc-shaped groove (31).

8. The fitting of claim 1, wherein The connecting rod (1) also includes a transition section (14) located between the mating section (12) and the main body of the connecting rod (1), the diameter of the transition section (14) being smaller than the diameter of the mating section (12).

9. The fitting of claim 1, wherein The guide section (11) is a frustum-shaped structure, and its outer diameter gradually increases from the end towards the mating section (12).

10. The fitting of claim 1, wherein The cross-sectional shape of the limiting ring (13) is an arc.

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