Pipe expansion type coupler

Abstract

The utility model provides a pipe expansion type coupler, and relates to the technical field of couplings. The pipe expansion type coupler comprises a coupler body and an expansion shaft, a connecting channel, a transition channel and an expansion channel are sequentially arranged in the coupler body in the axial direction of the expansion shaft, the two ends of the transition channel communicate with the connecting channel and the expansion channel correspondingly, and the expansion channel is formed by matching a plurality of expansion parts arranged at intervals in the circumferential direction of the coupler body; the side wall, close to the expansion channel, of at least one expansion part is arranged to be an expansion face inclining towards the axis close to the expansion channel, and internal threads are arranged on the inner wall of the transition channel. The second end of the expansion shaft is provided with an external thread, the second end of the expansion shaft penetrates through the connecting channel to be in threaded connection with the transition channel, the expansion shaft is screwed so that the second end of the expansion shaft can be matched with the expansion face in an expansion mode, and the multiple expansion parts can be expanded and connected with the connecting hole in an expansion mode. The pipe expansion type coupler is simple in structure and suitable for the transmission scene that the diameter of a connecting hole is small, and the wall of the connecting hole is free of a key groove.

Description

Technical Field

[0001] The utility model relates to the technical field of couplings, in particular to a tube expansion coupling. Background Art

[0002] In industrial automation scenarios, couplings are widely used in various automation equipment as a link between the power end and the output end. The types of couplings are endless according to different needs. For connections with a shaft at the input end and a hole at the output end, keyway connection or expansion sleeve connection is generally used. The coupling with a keyway connection requires the shaft and hole to have the same diameter and a keyway. There is a forward and reverse clearance in the connection, which is not suitable for scenarios requiring precise transmission. Although the coupling with an expansion sleeve connection can meet the needs of precise transmission, it usually requires the use of expansion parts, which makes its structure relatively complex. Moreover, due to the thickness of the expansion sleeve itself, the output end diameter is usually larger than the input end shaft diameter, which cannot be applied to scenarios where the diameter of the connecting hole is small and there is no keyway on the connecting hole wall. Utility Model Content

[0003] The purpose of the utility model is to provide a tube expansion coupling, which has a simple structure and is suitable for transmission scenarios where the diameter of the connecting hole is small and the connecting hole wall has no keyway.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] Tube expansion coupling, including:

[0006] A coupling body, wherein a connecting channel, a transition channel, and an expansion channel for connecting to an external connecting shaft are sequentially provided inside the coupling body along its axial direction, and both ends of the transition channel are respectively connected to the connecting channel and the expansion channel, wherein the expansion channel is formed by a plurality of expanding portions arranged at intervals along the circumference of the coupling body, and the plurality of expanding portions are capable of expansion-connecting with the connecting holes on the external connecting member, and along the extension direction of the expansion channel, at least one of the expanding portions is provided with an expansion surface inclined toward the axis of the expansion channel near the side wall of the expansion channel, and the inner wall of the transition channel is provided with an internal thread;

[0007] An expansion shaft, wherein the second end of the expansion shaft is provided with an external thread corresponding to the internal thread, and the second end of the expansion shaft passes through the connecting channel and is threadedly connected to the transition channel. The expansion shaft is screwed so that the second end of the expansion shaft is tightly fitted with the expansion surface, so that the multiple expansion parts can expand in a direction away from the expansion channel and expand with the connecting hole.

[0008] As a further technical solution, four expanding parts are evenly spaced apart on the coupling body along the circumference of the coupling body, and the side walls of the four expanding parts close to the expansion channel are all configured as the expansion surfaces.

[0009] As a further technical solution, the four expanding surfaces have the same inclination angle.

[0010] As a further technical solution, a reinforcement portion is provided at the connection between two adjacent expansion portions and the coupling body, each reinforcement portion is configured as a circular through hole, and the reinforcement portion is connected to the gap between the corresponding two adjacent expansion portions.

[0011] As a further technical solution, the internal thread of the inner wall of the transition channel is configured as a fine thread.

[0012] As a further technical solution, an auxiliary channel is provided between the connecting channel and the transition channel. When the second end of the expanding shaft is threadedly connected to the transition channel, the first end of the expanding shaft is located in the auxiliary channel, and the first end of the expanding shaft is provided with an auxiliary groove.

[0013] As a further technical solution, the diameter of the auxiliary channel is larger than that of the transition channel, so that a limiting step is formed between the auxiliary channel and the transition channel. A limiting portion is provided at the first end of the expansion shaft, and the auxiliary groove is provided on the end surface of the limiting portion away from the expansion shaft. Twisting the expansion shaft can limit the limiting portion to the limiting step.

[0014] As a further technical solution, the tubular expansion coupling further includes a washer, which is sleeved on the expansion shaft and located between the limiting portion and the limiting step.

[0015] As a further technical solution, the tube expansion coupling also includes a limiter, corresponding to the connecting channel, and a limiter hole communicating with the connecting channel is provided on the coupling body, and the limiter is limitatively connected to the limiter hole to limit the relative position of the external connecting shaft and the coupling body.

[0016] As a further technical solution, the diameter of the connecting channel gradually decreases from the connecting channel to the expansion channel;

[0017] Alternatively, a limiting thread is provided inside the connecting channel.

[0018] Compared with the existing technology, the technical advantages of the tube expansion coupling provided by the utility model are:

[0019] Since the expansion surface is inclined along the extension direction of the expansion channel toward the axis of the expansion channel, and the expansion shaft is twisted so that the second end of the expansion shaft is tightly fitted with the expansion surface, the multiple expansion parts are expanded in the direction away from the expansion channel. Therefore, when it is necessary to realize the transmission connection between the external connection shaft and the external connection part, the multiple expansion parts on the coupling body are first inserted into the connection holes on the external connection part, and then the expansion shaft is extended from the connecting channel to the transition channel, and the second end of the expansion shaft is threadedly connected to the transition channel, and then the expansion shaft is twisted, and the second end of the expansion shaft is abutted against the expansion surface, so that the multiple expansion parts are expanded in the direction away from the expansion channel until the outer walls of the multiple expansion parts abut against the inner wall of the external connection hole, thereby fixing the coupling body to the external connection part; and then the external connection shaft is connected to the connection channel, thereby realizing the transmission connection between the external connection shaft and the external connection part through the coupling body, and ensuring its transmission accuracy. During the entire process, the coupling body can be connected to the connecting hole through the cooperation between the expansion shaft and multiple expansion parts without the help of expansion parts, thereby making the structure of the tube expansion coupling relatively simple and able to ensure the connection effect and transmission accuracy; at the same time, since there is no need to set up additional expansion parts, the diameter of the expansion channel can be reduced, that is, the size of the outer peripheral wall of the multiple expansion parts can be reduced, so that it can be suitable for transmission scenarios where the diameter of the connecting hole is small and there is no keyway on the inner wall of the connecting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 This is a cross-sectional view of a tube expansion coupling provided by an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of a coupling body in a tubular expansion coupling provided by an embodiment of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of a tube expansion coupling provided by an embodiment of the present utility model;

[0024] Figure 4 It is a structural schematic diagram of another embodiment of the tube expansion coupling provided by an embodiment of the utility model.

[0025] In the picture:

[0026] 10. External connecting shaft; 20. Connecting hole;

[0027] 100, coupling body; 110, expansion portion; 111, expansion surface; 120, reinforcement portion; 130, limiting hole; 101, connecting channel; 102, transition channel; 103, expansion channel; 104, auxiliary channel;

[0028] 200, expansion shaft; 210, limiting portion;

[0029] 300. Washer. DETAILED DESCRIPTION

[0030] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0031] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0032] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0033] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0034] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values that do not use relative terms should also be disclosed as specific values with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0035] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0036] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0037] Combine Figures 1 to 3As shown, the tube expansion coupling provided in this embodiment is suitable for transmission scenarios where the output end is a hole, and the tube expansion coupling has a simple structure and is suitable for transmission scenarios where the diameter of the connecting hole 20 is small and there is no keyway on the inner wall of the connecting hole 20. Specifically, the tube expansion coupling includes a coupling body 100 and an expansion shaft 200: along its axial direction, a connecting channel 101, a transition channel 102 and an expansion channel 103 for connecting with the external connecting shaft 10 are sequentially provided inside the coupling body 100, and the two ends of the transition channel 102 are respectively connected to the connecting channel 101 and the expansion channel 103, wherein the expansion channel 103 is formed by a plurality of expansion parts 110 arranged at intervals along the circumference of the coupling body 100, and the plurality of expansion parts 110 can be expanded with the connecting hole 20 on the external connecting part, along the expansion channel 103. In the extension direction, the side wall of at least one expanding portion 110 close to the expansion channel 103 is provided with an expansion surface 111 inclined toward the axis of the expansion channel 103, and the inner wall of the transition channel 102 is provided with an internal thread; the second end of the expansion shaft 200 is provided with an external thread corresponding to the internal thread, and the second end of the expansion shaft 200 passes through the connecting channel 101 and is threadedly connected to the transition channel 102. The expanding shaft 200 is screwed so that the second end of the expanding shaft 200 is tightly fitted with the expansion surface 111, which can enable multiple expanding portions 110 to expand in a direction away from the expansion channel 103 and expand into the connecting hole 20.

[0038] Since the expansion surface 111 is inclined along the extension direction of the expansion channel 103 toward the axis of the expansion channel 103, and the expansion shaft 200 is screwed, the second end of the expansion shaft 200 is tightly fitted with the expansion surface 111, so that the multiple expansion parts 110 expand in the direction away from the expansion channel 103. Therefore, when it is necessary to realize the transmission connection between the external connecting shaft 10 and the external connecting member, the multiple expansion parts 110 on the coupling body 100 are first inserted into the connecting hole 20 on the external connecting member, and then the expansion shaft 200 is extended from the connecting channel to the transition channel 102, and the second end of the expansion shaft 200 is threadedly connected to the transition channel 102, and then the expansion shaft 200 is screwed, and the second end of the expansion shaft 200 is abutted against the expansion surface 111, and the multiple expansion parts 110 are expanded in the direction away from the expansion channel 103 until the outer walls of the multiple expansion parts 110 abut against the inner wall of the external connecting hole 20, thereby fixing the coupling body 100 to the external connecting member; thereafter, the external connecting shaft 10 is connected to the connecting channel 101, thereby realizing the transmission connection between the external connecting shaft 10 and the external connecting member through the coupling body 100, and ensuring its transmission accuracy. During the entire process, the coupling body 100 can be connected to the connecting hole 20 by cooperating with the expansion shaft 200 and the multiple expansion parts 110 without the help of expansion parts, thereby making the structure of the tube expansion coupling relatively simple and able to ensure the connection effect and transmission accuracy; at the same time, since there is no need to additionally set up expansion parts, the diameter of the expansion channel 103 can be reduced, that is, the size of the outer peripheral wall of the multiple expansion parts 110 can be reduced, so that it can be suitable for transmission scenarios where the diameter of the connecting hole 20 is small and there is no keyway on the inner wall of the connecting hole 20.

[0039] Preferably, four expansion portions 110 are evenly spaced along the circumference of the coupling body 100, and the side walls of the four expansion portions 110 close to the expansion channel 103 are all set as expansion surfaces 111. In this way, when the expansion shaft 200 is twisted, the second end of the expansion shaft 200 abuts against the multiple expansion surfaces 111 to ensure that the multiple expansion portions 110 expand in a direction away from the expansion channel 103 and abut against the inner wall of the connecting hole 20, thereby ensuring the connection effect between the multiple expansion portions 110 and the external connecting parts. In other embodiments, the number of expansion portions 110 is not limited to this and can be appropriately increased or decreased according to actual needs.

[0040] In order to further improve the stability when the outer walls of the multiple expanded parts 110 abut against the inner wall of the connecting hole 20, thereby ensuring the connection strength and connection stability when the coupling body 100 is fixedly connected to the external connecting part, in this embodiment, the inclination angles of the four expanded surfaces 111 are the same. In this way, when the second end of the expansion shaft 200 abuts against the four expanded surfaces 111, it can be ensured that the abutting forces between the outer walls of the four expanded parts 110 and the inner wall of the connecting hole 20 are equal.

[0041] Preferably, a reinforcement portion 120 is provided at the connection between two adjacent expansion portions 110 and the coupling body 100 , each reinforcement portion 120 is configured as a circular through hole, and the reinforcement portion 120 is connected to the gap between the corresponding two adjacent expansion portions 110 .

[0042] Combine Figure 2 and Figure 3 As shown, the circular reinforcement portion 120 can reduce the internal stress at the gap formed between two adjacent expanded portions 110 , effectively preventing cracking between the two adjacent expanded portions 110 , thereby extending the service life of the coupling body 100 .

[0043] In order to further improve the connection accuracy and connection strength between the expansion shaft 200 and the transition channel 102, in this embodiment, the internal thread of the inner wall of the transition channel 102 is set as a fine thread, and the external thread on the expansion shaft 200 is correspondingly set as a fine thread.

[0044] Preferably, an auxiliary channel 104 is provided between the connecting channel 101 and the transition channel 102. When the second end of the expanding shaft 200 is threadedly connected to the transition channel 102, the first end of the expanding shaft 200 is located in the auxiliary channel 104. In this way, the auxiliary channel 104 provides an avoidance space for the expanding shaft 200. When the external connecting shaft 10 is connected to the connecting channel 101, interference between the external connecting shaft 10 and the expanding shaft 200 can be avoided, thereby ensuring the connection effect between the external connecting shaft 10 and the coupling body 100, and ensuring the expansion effect of the expanding shaft 200 on the multiple expansion parts 110, so as to ensure the connection effect between the coupling body 100 and the connecting hole 20 on the external connecting part. The first end of the expansion shaft 200 is provided with an auxiliary groove. Depending on actual needs, the cross-sectional shape of the auxiliary groove along the axial direction of the expansion shaft 200 can be configured to be a cross, a rectangle, or a polygon. This facilitates the use of an external auxiliary tool such as a screwdriver to tighten the expansion shaft 200, ensuring the effectiveness of the expansion shaft 200 and reducing the difficulty of tightening the expansion shaft 200. In other embodiments, the first end of the expansion shaft 200 can also be configured directly as a hexagonal prism without the auxiliary groove, and the expansion shaft 200 can then be tightened using an Allen wrench.

[0045] Preferably, the diameter of the auxiliary channel 104 is larger than that of the transition channel 102, so that a limiting step is formed between the auxiliary channel 104 and the transition channel 102. A limiting portion 210 is provided at the first end of the expansion shaft 200, and an auxiliary groove is provided on the end surface of the limiting portion 210 facing away from the expansion shaft 200. Twisting the expansion shaft 200 can limit the limiting portion 210 to the limiting step. In this way, when the expansion shaft 200 is twisted, the limiting portion 210 abuts against the limiting step, thereby preventing the expansion shaft 200 from twisting too far and causing damage to the multiple expansion portions 110, or causing failure of the connection between the coupling body 100 and the connecting hole 20 on the external connector.

[0046] Preferably, the tubular expansion coupling further includes a washer 300, which is sleeved onto the expansion shaft 200 and positioned between the stopper 210 and the stop step. The washer 300 enhances the bearing strength between the expansion shaft 200 and the transition channel 102, thereby improving structural stability during the expansion process.

[0047] Preferably, the tubular expansion coupling further includes a limit member corresponding to the connecting channel 101. A limit hole 130 communicating with the connecting channel 101 is provided on the coupling body 100. The limit member is limitably connected to the limit hole 130 to limit the relative position of the external connecting shaft 10 and the coupling body 100.

[0048] The limiting hole 130 is set as a threaded hole, and the limiting piece is set as a stud. After the external connecting shaft 10 is inserted into the connecting channel 101, the stud is threadedly connected to the threaded hole, and the stud is screwed so that the stud abuts against the external connecting shaft 10, thereby fixing the external connecting shaft 10 to the coupling body 100.

[0049] Alternatively, the limiting hole 130 is set as a threaded hole, the limiting member is set as a connecting rod, and the end of the external connecting shaft 10 connected to the coupling is provided with a limiting through hole extending along its radial direction. When the external connecting shaft 10 is inserted into the connecting channel 101, the connecting rod passes through the threaded hole and the limiting through hole, thereby fixing the external connecting shaft 10 to the coupling body 100.

[0050] Alternatively, the connecting channel 101 is formed by two oppositely arranged connecting curved panels. Figure 4 As shown, the two connecting curved plates are movably connected by a threaded connector; after the external connecting shaft 10 is inserted into the connecting channel 101, the threaded connector is tightened to make the two connecting curved plates move in a direction approaching each other until the two connecting curved plates embrace the external connecting shaft 10, thereby achieving a fixed connection between the external connecting shaft 10 and the coupling body 100.

[0051] Alternatively, the diameter of the connecting channel 101 gradually decreases from the connecting channel 101 to the expansion channel 103 ; the external connecting shaft 10 is fixedly connected to the coupling body 100 by an interference fit between the external connecting shaft 10 and the connecting channel 101 .

[0052] Alternatively, a limiting thread is provided inside the connection channel 101. One end of the external connection shaft 10 connected to the coupling is provided with a limiting external thread, and the external connection shaft 10 is threadedly connected to the connection channel 101 to achieve fixed connection of the external connection shaft 10 to the coupling body 100.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Tube expansion coupling, characterized in that: include: A coupling body (100), wherein a connecting channel (101), a transition channel (102) and an expansion channel (103) for connecting to an external connecting shaft (10) are sequentially arranged inside the coupling body (100) along its axial direction, and both ends of the transition channel (102) are respectively connected to the connecting channel (101) and the expansion channel (103), wherein the expansion channel (103) is formed by a plurality of expansion portions (110) arranged at intervals along the circumference of the coupling body (100), and the plurality of expansion portions (110) can be expanded with the connection holes (20) on the external connecting member, and along the extension direction of the expansion channel (103), the side wall of at least one of the expansion portions (110) close to the expansion channel (103) is arranged as an expansion surface (111) inclined toward the axis of the expansion channel (103), and the inner wall of the transition channel (102) is provided with an internal thread; An expansion shaft (200), the second end of the expansion shaft (200) is provided with an external thread corresponding to the internal thread, the second end of the expansion shaft (200) passes through the connecting channel (101) and is threadedly connected to the transition channel (102), and the expansion shaft (200) is screwed so that the second end of the expansion shaft (200) is tightly fitted with the expansion surface (111), so that the multiple expansion parts (110) can expand in a direction away from the expansion channel (103) and expand with the connecting hole (20).

2. The tube expansion coupling according to claim 1, characterized in that: Along the circumference of the coupling body (100), four expansion parts (110) are evenly spaced on the coupling body (100), and the side walls of the four expansion parts (110) close to the expansion channel (103) are all configured as the expansion surfaces (111).

3. The tube expansion coupling according to claim 2, characterized in that: The four expansion surfaces (111) have the same inclination angle.

4. The tube expansion coupling according to claim 1, characterized in that: A reinforcement portion (120) is provided at the connection between two adjacent expansion portions (110) and the coupling body (100), each reinforcement portion (120) is configured as a circular through hole, and the reinforcement portion (120) is connected to the gap between the corresponding two adjacent expansion portions (110).

5. The tube expansion coupling according to claim 1, characterized in that: The internal thread of the inner wall of the transition channel (102) is configured as a fine thread.

6. The tube expansion coupling according to claim 1, characterized in that: An auxiliary channel (104) is provided between the connecting channel (101) and the transition channel (102); when the second end of the expansion shaft (200) is threadedly connected to the transition channel (102), the first end of the expansion shaft (200) is located in the auxiliary channel (104), and the first end of the expansion shaft (200) is provided with an auxiliary groove.

7. The tube expansion coupling according to claim 6, characterized in that: The diameter of the auxiliary channel (104) is larger than that of the transition channel (102), so that a limiting step is formed between the auxiliary channel (104) and the transition channel (102). A limiting portion (210) is provided at the first end of the expansion shaft (200), and the auxiliary groove is provided on the end surface of the limiting portion (210) away from the expansion shaft (200). Twisting the expansion shaft (200) can limit the limiting portion (210) to the limiting step.

8. The tube expansion coupling according to claim 7, characterized in that: The tubular expansion coupling further comprises a washer (300), which is sleeved on the expansion shaft (200) and located between the limiting portion (210) and the limiting step.

9. The tubular expansion coupling according to any one of claims 1 to 8, characterized in that: The tubular expansion coupling further comprises a limiting member, corresponding to the connecting channel (101), a limiting hole (130) communicating with the connecting channel (101) being provided on the coupling body (100), and the limiting member is limitatively connected to the limiting hole (130) to limit the relative position of the external connecting shaft (10) and the coupling body (100).

10. The tube expansion coupling according to any one of claims 1 to 8, characterized in that: The diameter of the connecting channel (101) gradually decreases in the direction from the connecting channel (101) to the expansion channel (103); Alternatively, a limiting thread is provided inside the connecting channel (101).

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