Expansion type coupler

Abstract

The utility model provides an expansion type coupler, and relates to the technical field of couplings. The expansion type coupler comprises a coupler body and two groups of expansion coupling assemblies, wherein the coupler body is provided with an elastic section; the two expansion coupling assemblies are arranged at the two ends of the coupling body correspondingly and can be connected with an external linkage shaft. The expansion type coupler can make up deviation of part of installation positions, and the using performance of the expansion type coupler is improved.

Description

Technical Field

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

[0002] The coupling is a mechanical part used to connect the driving shaft and the driven shaft in different mechanisms so that they rotate together to transmit torque. In high-speed and heavy-load power transmission, some couplings also have the functions of buffering, vibration reduction, improving the dynamic performance of the shaft system and overload protection.

[0003] Existing couplings generally include clamping couplings, expansion couplings, etc. Clamping couplings are easily affected by equipment vibration during long-term operation, causing the locking screws to loosen, resulting in power transmission failure. If the existing expansion coupling is installed in a position that deviates, it will affect its installation and use. Utility Model Content

[0004] The utility model aims to provide an expansion coupling, which can compensate for the deviation of a part of the installation position and improve its use performance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Expansion coupling, including:

[0007] The coupling body is provided with an elastic section;

[0008] Two sets of expansion coupling assemblies are respectively arranged at two ends of the coupling body and can be connected to an external linkage shaft.

[0009] As a further technical solution, the elastic section is configured as a spring section or a spiral slit extending along the axis of the coupling body, and the elastic section is disposed in the middle of the coupling body.

[0010] As a further technical solution, each of the expansion coupling assemblies comprises a connector, a ferrule and a locking nut, wherein the connector is fixedly connected to the corresponding end of the coupling body, and a coupling cavity extending along the axis of the coupling body is provided in the middle of the connector;

[0011] The outer peripheral wall of the ferrule abuts against the inner wall of the corresponding coupling cavity, and the locking nut is threadedly connected to the corresponding connector.

[0012] As a further technical solution, in the direction from the ferrule to the coupling cavity, the outer peripheral wall of the ferrule is arranged as an inclined surface approaching the axis of the ferrule.

[0013] As a further technical solution, in the direction from the ferrule to the coupling cavity, the inner wall of the coupling cavity is arranged to be an inclined abutting surface corresponding to the outer peripheral wall of the ferrule.

[0014] As a further technical solution, the inclination angle of the inclined surface is greater than the inclination angle of the inclined abutting surface.

[0015] As a further technical solution, a compensation groove is provided on the ferrule, and the compensation groove extends along the circumference of the ferrule and passes through the side wall of the ferrule.

[0016] As a further technical solution, a limiting portion is provided on a side of the locking nut facing away from the connector.

[0017] As a further technical solution, the connector is integrally formed with the coupling body.

[0018] As a further technical solution, the expansion coupling assembly further includes a locking nut, which is threadedly connected to the corresponding connector and is located on a side of the locking nut close to the coupling body.

[0019] Compared with the prior art, the technical advantages of the expansion coupling provided by the utility model are:

[0020] Since an elastic section is provided on the coupling body and has a certain flexibility, when installing the expansion coupling assembly, if there is a deviation in the installation position, the elastic section can be appropriately stretched or compressed to compensate for the deviation in the installation position, so that the expansion coupling assembly connected to both ends of the coupling body is connected to the corresponding external linkage shaft to ensure the installation effect and transmission effect of the expansion coupling assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an exploded view of the expansion coupling provided by the embodiment of the utility model.

[0022] In the figure:

[0023] 100, coupling body; 110, elastic section;

[0024] 200, expansion coupling assembly; 210, connector; 211, coupling cavity; 220, ferrule; 221, compensation groove; 230, locking nut; 231, limiting portion; 240, anti-loosening nut. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] Combination Figure 1 As shown, the expansion coupling provided in this embodiment can be connected to the corresponding transmission shaft at both ends. During use, it can compensate for the deviation of some installation positions and improve its performance. Specifically,

[0030] The expansion coupling comprises a coupling body 100 and two sets of expansion coupling assemblies 200: the coupling body 100 is provided with an elastic section 110; the two sets of expansion coupling assemblies 200 are respectively arranged at two ends of the coupling body 100, and both can be connected to an external linkage shaft.

[0031] Since the coupling body 100 is provided with an elastic section 110, and the elastic section 110 has a certain flexibility, when installing the expansion coupling assembly 200, if there is a deviation in the installation position, the elastic section 110 can be appropriately bent to compensate for the deviation in the installation position, so that the expansion coupling assembly 200 connected to the two ends of the coupling body 100 is connected to the corresponding external linkage shaft to ensure the installation effect and transmission effect of the expansion coupling assembly 200.

[0032] According to actual needs, the elastic section 110 can be set as a spring section or a spiral slit extending along the axis of the coupling body 100 , and the elastic section 110 is set in the middle of the coupling body 100 .

[0033] In this embodiment, the spring section is set as a spiral slit, and the spiral slit extends along the axis of the coupling body 100. While compensating for the installation position deviation, during the use of the expansion coupling, if one end of the expansion coupling is connected to the output shaft of the motor and the other end is connected to the external linkage shaft, when the output torque of the motor is greater than the maximum torque that the expansion coupling can withstand, the spiral slit breaks, thereby avoiding damage to the motor or the external linkage shaft. In addition, the spiral slit is set in the middle of the coupling body 100, which can ensure that the torque that can be borne by both ends of the coupling body 100, as well as the torsion resistance and flexibility of both ends are equal, thereby ensuring the use effect of the coupling body 100.

[0034] Taking one group of expansion coupling assemblies 200 as an example, specifically, the expansion coupling assembly 200 includes a connector 210, a ferrule 220 and a locking nut 230. The connector 210 is fixedly connected to the corresponding end of the coupling body 100, and a coupling cavity 211 extending along the axis of the coupling body 100 is provided in the middle of the connector 210; the outer peripheral wall of the ferrule 220 abuts against the inner wall of the corresponding coupling cavity 211, and the locking nut 230 is threadedly connected to the corresponding connector 210.

[0035] The ferrule 220 is set to be annular, and the outer wall of the connector 210 is provided with external threads corresponding to the locking nut 230. When the external linkage shaft is connected to the expansion coupling, the ferrule 220 is placed in the coupling cavity 211, and then one end of the external linkage shaft is placed in the ferrule 220, and then the locking nut 230 is screwed. Under the pressure of the locking nut 230, the ferrule 220 is retracted in the coupling cavity 211 in the direction close to the coupling body 100. In this process, the ferrule 220 is radially retracted and tightly embraced with the external linkage shaft, thereby realizing the connection between the external linkage shaft and the expansion coupling assembly 200.

[0036] In order to further enhance the structural strength of the expansion coupling itself, as well as the connection stability and connection strength after being connected to the external linkage shaft, in this embodiment, the connector 210 is integrally formed with the coupling body 100 .

[0037] Furthermore, in the process of the dynamic locking nut 230 forcing the ferrule 220 to retract in the coupling cavity 211 toward the coupling body 100, in order to further improve the stability of the ferrule 220 when it is retracted in the coupling cavity 211 and ensure the clamping effect of the ferrule 220 on the external linkage shaft when it is radially retracted, in the present embodiment, in the direction from the ferrule 220 to the coupling cavity 211, the outer peripheral wall of the ferrule 220 is set as an inclined surface close to the axis of the ferrule 220, and the inner wall of the coupling cavity 211 corresponding to the outer peripheral wall of the ferrule 220 is set as an inclined abutment surface. With the cooperation between the inclined surface and the inclined abutting surface, on the one hand, when the ferrule 220 is retracted in the coupling cavity 211, the retraction path of the ferrule 220 is guided and limited to avoid the situation that the axis of the ferrule 220, the axis of the external linkage shaft and the axis of the coupling body 100 are not concentric after the ferrule 220 clamps the external linkage shaft, thereby ensuring the linkage effect of the expansion coupling; on the other hand, since the inner wall of the coupling cavity 211 is arranged as an inclined abutting surface, that is, the inner diameter of the coupling cavity 211 gradually decreases from the connector 210 to the coupling body 100, as the ferrule 220 is retracted in the coupling cavity 211, the more serious the internal deformation of the ferrule 220 is, the better the clamping effect on the external linkage shaft is. In this embodiment, the inclination angle of the inclined surface is greater than the inclination angle of the inclined abutting surface. Through the angle difference between the inclined surface and the inclined abutting surface, it is ensured that when the locking nut 230 is screwed, the convenience of retracting the sleeve 220 in the coupling cavity 211 and the retraction effect of the sleeve 220 can be further improved.

[0038] Preferably, in order to prevent the clamping sleeve 220 from affecting the clamping effect on the external linkage shaft due to excessive deformation of the clamping sleeve 220 during the retraction process of the clamping sleeve 220, in this embodiment, a compensation groove 221 is provided on the clamping sleeve 220, and the compensation groove 221 extends along the circumference of the clamping sleeve 220 and penetrates the side wall of the clamping sleeve 220. During the retraction process of the clamping sleeve 220, the compensation groove 221 deforms itself to compensate for the overall deformation of the clamping sleeve 220, thereby ensuring the clamping effect of the corresponding external linkage shaft to achieve the transmission of power and torque.

[0039] Preferably, a limiting portion 231 is provided on the side of the locking nut 230 away from the connector 210. The limiting portion 231 extends in an annular shape along the axial direction of the locking nut 230. In the process of twisting the locking nut 230 to compress the ferrule 220, after the locking nut 230 is twisted to a certain position, the limiting portion 231 abuts against the end of the connector 210 away from the coupling body 100, that is, the limiting portion 231 limits the twisting path of the locking nut 230, so as to avoid the situation where the compression force on the connector 210 and the ferrule 220 is too large due to the twisting path of the locking nut 230 being too large, so that the ferrule 220, the connector 210 or the external linkage shaft are damaged.

[0040] Furthermore, the expansion coupling assembly 200 further includes a locking nut 240, which is threadedly connected to the corresponding connector 210 and is located on the side of the locking nut 230 close to the coupling body 100. After the external linkage shaft is connected to the corresponding expansion coupling assembly 200, the locking nut 230 and the locking nut 240 are provided at the same time, and the two cooperate with each other to improve the clamping effect of the expansion coupling assembly 200 on the external linkage shaft, thereby reducing the occurrence of failure of the expansion coupling assembly 200 due to equipment vibration, so as to improve the maintenance convenience of the expansion coupling.

[0041] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Expansion coupling, characterized in that: include: The coupling body (100) is provided with an elastic section (110); Two groups of expansion coupling assemblies (200) are respectively arranged at two ends of the coupling body (100) and can be connected to an external linkage shaft.

2. The expansion coupling according to claim 1, characterized in that: The elastic section (110) is configured as a spring section or a spiral slit extending along the axis of the coupling body (100), and the elastic section (110) is arranged in the middle of the coupling body (100).

3. The expansion coupling according to claim 1, characterized in that: Each of the expansion coupling assemblies (200) comprises a coupling (210), a ferrule (220) and a locking nut (230); the coupling (210) is fixedly connected to the corresponding end of the coupling body (100), and a coupling cavity (211) extending along the axis of the coupling body (100) is provided in the middle of the coupling (210); The outer peripheral wall of the ferrule (220) abuts against the inner wall of the corresponding coupling cavity (211), and the locking nut (230) is threadedly connected to the corresponding connector (210).

4. The expansion coupling according to claim 3, characterized in that: In the direction from the ferrule (220) to the coupling cavity (211), the outer peripheral wall of the ferrule (220) is arranged as an inclined surface approaching the axis of the ferrule (220).

5. The expansion coupling according to claim 4, characterized in that: In the direction from the ferrule (220) to the coupling cavity (211), the inner wall of the coupling cavity (211) is arranged to be an inclined abutting surface corresponding to the outer peripheral wall of the ferrule (220).

6. The expansion coupling according to claim 5, characterized in that: The inclination angle of the inclined surface is greater than the inclination angle of the inclined abutting surface.

7. The expansion coupling according to claim 3, characterized in that: The ferrule (220) is provided with a compensation groove (221), and the compensation groove (221) extends along the circumference of the ferrule (220) and penetrates the side wall of the ferrule (220).

8. The expansion coupling according to claim 3, characterized in that: A limiting portion (231) is provided on a side of the locking nut (230) facing away from the connector (210).

9. The expansion coupling according to claim 3, characterized in that: The connector (210) and the coupling body (100) are integrally formed.

10. The expansion coupling according to claim 3, characterized in that: The expansion coupling assembly (200) further comprises a locking nut (240), wherein the locking nut (240) is threadedly connected to the corresponding connector (210) and is located on a side of the locking nut (230) close to the coupling body (100).

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