Coupling

Abstract

The utility model relates to the technical field of well drilling, in particular to a coupler. Comprising a coupler front end used for being connected with a driving shaft and a coupler rear end used for being connected with a driven shaft, the coupler front end is fixedly arranged, the coupler rear end is arranged on the coupler front end in a sliding fit mode in the axial direction, and the coupler rear end is matched with the coupler front end in a radial limiting mode. And moreover, the device has few parts, is simple in structure, and is easy to arrange in a narrow space.

Description

Technical Field

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

[0002] The coupling is a mechanical component used to firmly connect the driving shaft and the driven shaft in different mechanisms so that they rotate together and transmit motion and torque. In a transmission system where relative motion occurs between the driving shaft and the driven shaft, resulting in relative axial displacement, a small working space and a large transmission torque, conventional couplings cannot meet the function of compensating for the relative displacement between the driving shaft and the driven shaft.

[0003] Chinese patent application number CN201510902250.9 discloses an elastic coupling, in which two halves of the coupling are fixedly connected by bolts. This structure cannot compensate for the relative displacement between the driving shaft and the driven shaft.

[0004] Chinese patent application number CN201510901307.3 discloses a coupling that is easy to disassemble. The two halves of the coupling are also fixedly connected by bolts. This structure cannot compensate for the relative displacement between the driving shaft and the driven shaft.

[0005] In summary, how to reasonably set the structure of the coupling so that it can compensate for the relative axial movement of the driving shaft and the driven shaft is a difficult problem that needs to be solved. Utility Model Content

[0006] The purpose of the utility model is to provide a coupling to compensate for the relative axial movement of the driving shaft and the driven shaft, with fewer parts, simple structure and easy to be arranged in a small space.

[0007] The utility model discloses a coupling, comprising a coupling front end for connecting a driving shaft and a coupling rear end for connecting a driven shaft, wherein the coupling front end is fixedly arranged, the coupling rear end is axially slidingly fitted on the coupling front end, and the coupling rear end is radially limitedly fitted with the coupling front end.

[0008] More preferably, the front end of the coupling is used to connect one end of the rear end of the coupling and an axial displacement compensation groove is provided inside, and the rear end of the coupling is slidably disposed in the axial displacement compensation groove.

[0009] More preferably, the axial displacement compensation groove includes a center groove and a key groove radially distributed outside the center groove, and the rear end of the coupling is used to connect to one end of the front end of the coupling and a spline is provided on the outer edge of the shaft body, and the spline radially cooperates with the key groove.

[0010] More preferably, the spline includes a plurality of key bodies evenly distributed along the radial direction, the key body includes a front key body and a rear key body, the radial height of the front key body is greater than the radial height of the rear key body, and the radial depth of the keyway is consistent with the radial height of the front key body.

[0011] Preferably, the front key body is an arched key body with a radial height in the middle higher than that at both ends, and the rear end of the coupling is used to set a shaft body of the arched key body, which is a spherical shaft body with a diameter in the middle larger than that at both ends, and the spherical shaft body is of the same length as the arched key body.

[0012] Preferably, the radial cross-sections of the key body and the keyway are sector-shaped surfaces with matching shapes.

[0013] More preferably, the rear end of the coupling is provided with a rear shaft body for connecting with the driven shaft, and the rear key body is transitionally connected with the rear shaft body through a conical surface with a gradually decreasing diameter.

[0014] Preferably, the axial depth of the axial displacement compensation groove is greater than one eighth of the axial displacement distance that the coupling needs to compensate.

[0015] The embodiment of the present application realizes compensation of axial displacement of the variable speed transmission shaft by means of a coupling component that can slide relative to the axial direction. The coupling is composed of only two parts, and its manufacturing and assembly process is relatively simple, which not only reduces the manufacturing cost but also improves the assembly efficiency. The structure has a compact mechanical layout and is easy to arrange in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 these drawings without paying creative work.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the coupling of the utility model in an extended state;

[0018] Figure 2 for Figure 1 The main view;

[0019] Figure 3 for Figure 1 Side view of

[0020] Figure 4 for Figure 3 AA section view;

[0021] Figure 5It is a three-dimensional structural schematic diagram of the coupling of the utility model in a contracted state;

[0022] Figure 6 for Figure 5 The main view;

[0023] Figure 7 for Figure 5 Side view of

[0024] Figure 8 for Figure 7 AA section view;

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the front end of the coupling;

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the rear end of the coupling;

[0027] Fig.11 It is the front view of the rear end of the coupling;

[0028] Fig.12 It is a side view of the rear end of the coupling;

[0029] Fig.13 for Fig.12 AA section view. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0035] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Multiple" means "two or more".

[0037] The coupling 4 is a mechanical component used to firmly connect the driving shaft and the driven shaft in different mechanisms so that they rotate together and transmit motion and torque. In order to compensate for the axial displacement of the speed change transmission shaft 2, this embodiment provides a coupling for compensating the axial displacement while transmitting torque. The coupling is designed to be a split structure consisting of a front end and a rear end, both of which can undergo axial relative displacement during normal operation and still transmit torque. Its structure is as follows Figures 1 to 13 As shown, it includes a coupling front end 41 for connecting the driving shaft and a coupling rear end 42 for connecting the driven shaft. The coupling front end 41 is fixedly arranged, and the coupling rear end 42 is axially slidingly fitted on the coupling front end 41. The coupling rear end 42 is radially limited and fitted with the coupling front end 41.

[0038] One end of the front end 41 of the coupling is connected to the driving shaft, and the other end is provided with an axial displacement compensation groove 411 inside. The axial displacement compensation groove 411 includes a center groove 412 and a key groove 413 radially distributed outside the center groove 412. One end of the rear end 42 of the coupling is provided with a spline at the outer edge of the shaft body, and the other end is connected to the driven shaft. The rear end 42 of the coupling is slidably arranged in the axial displacement compensation groove 411, and the spline and the axial key groove 413 are radially limited. When the rear end of the coupling is driven to move axially, power transmission can be maintained. At the same time, screw holes are designed at the assembly point of the front end 41 of the coupling and the driving shaft, and at the assembly point of the rear end 42 of the coupling and the driven shaft, for assembling fastening screws to limit the axial displacement between the coupling and the transmission rod connected thereto; the assembly point of the coupling and the driven shaft can be keyed. When there is a relative axial displacement between the input end and the output end, the axial displacement compensation groove 411 with a longer depth at the front end of the coupling can compensate for the axial displacement generated by the front end and the rear end of the coupling.

[0039] The spline includes a plurality of key bodies evenly distributed in the radial direction, and the specific number can be determined according to actual needs. The key body includes a front key body 421 and a rear key body 422. The radial height of the front key body 421 is greater than the radial height of the rear key body 422, and the radial depth of the keyway 413 is consistent with the radial height of the front key body 421. The front key body 421 is an arched key body with a radial height in the middle higher than that at both ends. The rear end 42 of the coupling is used to set a shaft body of the arched key body, which is a spherical shaft body 423 with a diameter in the middle greater than that at both ends, and the spherical shaft body 423 is the same length as the arched key body.

[0040] The area of ​​the transmission contact part of the rear end 42 of the coupling is reduced as much as possible by specially designing the contact surface in a stepped form and a cylindrical section contact form, which minimizes the resistance during axial movement and ensures the strength of the key. In addition to reducing the contact area, the special design of the cylindrical section contact form can also enable the coupling transmission to maintain the ability to maintain stable transmission when there is a deflection of less than about 1° between the front and rear couplings. This design can ensure that the transmission is not affected when the input shaft and the output shaft are deflected due to external or internal factors, and the anti-vibration performance is stronger, which improves the adaptability and reliability of the coupling.

[0041] The radial cross-section of the key body and the keyway 413 is a sector-shaped surface with matching shapes. The rear end 42 of the coupling is provided with a rear shaft body 424 for connecting the speed transmission shaft 2, and the rear key body 422 is transitionally connected to the rear shaft body 424 through a tapered surface 425 with a gradually decreasing diameter. The front end surface of the tapered surface 425 is a plane perpendicular to the central axis of the shaft body, and the plane forms a flange on the shaft body, and the spline and the flange are T-shaped. This design further guarantees the reliability of the spline strength.

[0042] The axial depth of the axial displacement compensation groove 411 is greater than one eighth of the axial displacement distance required to be compensated by the coupling 4, so as to compensate for the axial displacement generated between the front end 41 and the rear end of the coupling and ensure the stability of the coupling transmission.

[0043] The coupling fits more easily into compact machine layouts, reducing the impact on the overall size of the equipment. Its design, which consists of only two parts, means that the manufacturing and assembly process is relatively simple, which not only reduces manufacturing costs but also improves assembly efficiency. The simple structure also means fewer potential failure points, thereby improving the reliability of the coupling. Due to its simple structure, the maintenance requirements of this coupling are relatively low. It may not require frequent lubrication or adjustment, which reduces maintenance costs and time. When the coupling needs to be replaced, its simple structure makes the process quicker and easier. This reduces equipment downtime and improves production efficiency. Because it can compensate for axial displacement, this coupling is ideal for applications where there may be relative movement between shafts. At the same time, its compact design makes it an ideal choice for environments with limited space. The coupling is capable of handling high torque loads and is suitable for applications where high power transmission is required. And the compact assembly and solid structure ensure the stability and reliability of the coupling under high loads and high-speed operation.

[0044] In summary, this coupling design is very suitable for use in situations where the structural space is limited, axial displacement needs to be compensated, large torque is transmitted, and low maintenance costs and easy replacement are required. For example, it may be very suitable for use in certain industrial machinery, transmission systems, pumps and compressors. However, the specific application scenario still needs to be determined according to the actual needs and conditions of the equipment.

[0045] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state with less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0046] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0047] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including" is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0048] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A coupling, characterized in that: The coupling comprises a front end (41) of the coupling for connecting the driving shaft and a rear end (42) of the coupling for connecting the driven shaft, wherein the front end (41) of the coupling is fixedly arranged, the rear end (42) of the coupling is axially slidingly arranged on the front end (41) of the coupling, and the rear end (42) of the coupling is radially limitedly matched with the front end (41) of the coupling; The coupling front end (41) is used to connect one end of the coupling rear end (42) with an axial displacement compensation groove (411) provided inside, and the coupling rear end (42) is slidably disposed in the axial displacement compensation groove (411); The axial displacement compensation groove (411) comprises a central groove (412) and a key groove (413) radially distributed outside the central groove (412); the rear end (42) of the coupling is used to connect one end of the front end (41) of the coupling and is provided with a spline on the outer edge of the shaft body; the spline is radially matched with the key groove (413); The spline comprises a plurality of key bodies uniformly distributed along the radial direction, wherein the key bodies comprise a front key body (421) and a rear key body (422), the radial height of the front key body (421) being greater than the radial height of the rear key body (422), and the radial depth of the key groove (413) being consistent with the radial height of the front key body (421).

2. The coupling according to claim 1, characterized in that: The front key body (421) is an arched key body with a radial height in the middle higher than at both ends. The coupling rear end (42) is used to set a shaft body of the arched key body, which is a spherical shaft body (423) with a diameter in the middle greater than at both ends. The spherical shaft body (423) is of the same length as the arched key body.

3. The coupling according to claim 1, characterized in that: The radial cross-sections of the key body and the keyway (413) are sector-shaped surfaces with matching shapes.

4. The coupling according to claim 1, characterized in that: The rear end (42) of the coupling is provided with a rear shaft body (424) for connecting with a driven shaft, and the rear key body (422) is transitionally connected with the rear shaft body (424) via a conical surface (425) with a gradually decreasing diameter.

5. The coupling according to claim 1, characterized in that: The axial depth of the axial displacement compensation groove (411) is greater than one eighth of the axial displacement distance that the coupling (4) needs to compensate.

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