阅读说明：本技术 一种联轴器 (Shaft coupling ) 是由 周长勇 刘征磊 阴文豪 于 2021-09-13 设计创作，主要内容包括：本发明公开了一种联轴器,包括分别与待连接轴相连的第一法兰、第二法兰,连接第一法兰、第二法兰的连接结构；连接结构包括第一连接部以及第二连接部,其中第一连接部包括螺孔以及螺纹连接件,螺孔开设在第一法兰、第二法兰中,螺纹连接件至少部分穿设螺孔,螺纹连接件穿设螺孔连接第一法兰和第二法兰；其中第二连接部包括保持第一法兰、第二法兰对中的定位套筒,定位套筒设置为部分穿设在第一法兰、第二法兰中,定位套筒设置为与螺孔相邻并且至少在径向方向上支撑螺纹连接件。本发明中的定位套筒保证联轴器准确对中；定位套筒可实现剪切传扭。螺纹连接件与定位套筒只需间隙配合即可,便于安装与拆出。(The invention discloses a coupling, which comprises a first flange, a second flange and a connecting structure, wherein the first flange and the second flange are respectively connected with a shaft to be connected; the connecting structure comprises a first connecting part and a second connecting part, wherein the first connecting part comprises a screw hole and a threaded connecting piece, the screw hole is formed in the first flange and the second flange, at least part of the threaded connecting piece penetrates through the screw hole, and the threaded connecting piece penetrates through the screw hole to be connected with the first flange and the second flange; wherein the second connecting portion includes the position sleeve that keeps first flange, second flange centering, and the position sleeve sets up to wear to establish in first flange, second flange partially, and the position sleeve sets up to be adjacent and support threaded connection spare at least in radial direction with the screw. The positioning sleeve ensures that the coupler is accurately centered; the positioning sleeve can realize shearing and torque transmission. The threaded connecting piece and the positioning sleeve only need to be in clearance fit, and the threaded connecting piece is convenient to mount and dismount.)

1. A shaft coupling comprises a first flange (1) and a second flange (2) which are respectively connected with a shaft to be connected, and a connecting structure for connecting the first flange (1) and the second flange (2); it is characterized in that the preparation method is characterized in that,

the connecting structure comprises a first connecting part and a second connecting part,

the first connecting part comprises a screw hole (3) and a threaded connecting piece (4), the screw hole (3) is formed in the first flange (1) and the second flange (2), at least part of the threaded connecting piece (4) penetrates through the screw hole (3), and the threaded connecting piece (4) penetrates through the screw hole (3) to connect the first flange (1) and the second flange (2);

wherein the second connection comprises a positioning sleeve (5) keeping the first flange (1), the second flange (2) centered, the positioning sleeve (5) being arranged to partially penetrate into the first flange (1), the second flange (2), the positioning sleeve (5) being arranged adjacent to the screw hole (3) and supporting the threaded connection (4) at least in a radial direction.

2. The coupling according to claim 1, characterized in that said positioning sleeve (5) comprises a projection (6) projecting with respect to said threaded hole (3), said projection (6) defining an inner cavity (7) through which said threaded connection (4) at least partially passes.

3. A coupling according to claim 2, characterized in that the protrusions (6) are circular.

4. A coupling according to claim 3, characterized in that the protrusions (6) are arranged coaxially with the threaded bore (3).

5. A coupling according to any of claims 2-4, characterized in that the positioning sleeve (5) is adapted to transmit torque in shear with the threaded connection (4) at least partly inserted in the threaded bore (3).

6. The coupling according to any one of claims 2 to 4, wherein the threaded connector (4) is a reducing bolt, and the diameter of the part of the threaded connector (4) penetrating the inner cavity (7) of the locating sleeve (5) is larger than that of the other parts.

7. A coupling according to any of claims 1-4, characterized in that the positioning sleeve (5) is enclosed by more than two annular segments (12);

the second connecting part further comprises a fixing device fixedly mounting the positioning sleeve (5) in the first flange (1) and the second flange (2), and the fixing device fixes all the annular sections (12).

8. The coupling of claim 7,

the fixing device comprises a first sleeve (13) and a second sleeve (14), wherein the first sleeve (13) is axially extruded with all annular sections (12) of the positioning sleeve (5) and is in limited abutting connection;

one end of the second sleeve (14) is abutted against the first sleeve (13), and the other end of the second sleeve is abutted against an axial fixing structure of the first flange (1) or the second flange (2).

9. A coupling according to claim 8, characterized in that the end surface of the first sleeve (13) opposite to the ring segment (12) is a tapered surface (15) inclined at a set angle;

the ring-shaped section (12) bears the squeezing action of the first sleeve (13), and the ring-shaped section (12) is in sliding contact with the conical surface (15) and is fixed at an abutting position.

10. A coupling according to claim 8, characterized in that the fixing means comprise a set screw (16) applying an axially tightening load, a fixing groove (17) for the passage of the set screw (16);

the axial fixing structure of the first flange (1) or the second flange (2) is a nut (11), the nut (11) is provided with a fixing groove (17), and a set screw (16) penetrates through the fixing groove (17) to be connected with the second sleeve (14).

11. A coupling according to any of claims 1-4, characterized in that the positioning sleeve (5) is symmetrical about the end faces (9) where the first and second flanges (1, 2) meet.

12. A coupling according to any of claims 1-4, characterized in that the axial extension of the positioning sleeve (5) is smaller than the axial extension of the threaded bore (3).

13. A coupling according to any of claims 1-4, characterized in that the positioning sleeve (5) is of rigid construction.

14. A coupling according to any one of claims 1-4, characterized in that nut grooves (10) are respectively arranged in the first flange (1) and the second flange (2), the nut grooves (10) are through grooves with openings at both ends, one end of each nut groove (10) is opened and arranged on the outer end surface of the corresponding first flange (1) or second flange (2), and the other end of each nut groove (10) is opened and connected with the screw hole (3);

the nut (11) is embedded in the nut groove (10), and the nut (11) is in threaded connection with the threaded connecting piece (4).

15. A coupling according to claim 14, characterized in that the nut (11) embedded in the nut groove (10) has a frictional contact surface with the nut groove (10).

16. A coupling according to claim 15, characterized in that the nut (11) is a ball nut.

17. A coupling according to claim 16, characterized in that said frictional contact surface of said ball nut with said nut groove (10) is spherical.

Technical Field

The invention relates to a coupler, in particular to a coupler.

Background

The coupling is a common mechanical part for connecting multiple rotors in a shaft system, and generally comprises two torque transmission modes of friction torque transmission and shear torque transmission. For high power rotating machines, both friction and shear torque transmission are typically required. For the coupler needing to be cut and transmit torque, whether the coupler can be accurately centered or not influences normal operation, and even when the coupler is not accurately centered, safety accidents such as separation, deflection and the like can be caused. The coupler in the prior art is lack of a coupler capable of ensuring accurate centering, and even the coupler capable of ensuring accurate centering is not convenient to install and disassemble.

For example, there is disclosed an elastic coupling in the patent CN108302130A at present, which comprises a left half coupling, a right half coupling and a combined connector, wherein a plurality of axial pin holes are correspondingly formed in respective connecting flange plates of the left half coupling and the right half coupling, and a combined connector combined by a pin and a sleeve is installed in each axial pin hole. The sleeve in this patent is made for rubber elastic material, can effectively reduce the rigid impact of two half-couplings, but the sleeve that sets up in this elastic coupling only realizes alleviateing the effect of assaulting, can't guarantee the accurate centering of shaft coupling.

The prior patent CN201568422U discloses a taper bolt assembly for shear and torque transmission, which mainly uses a taper pin to penetrate into a taper sleeve, a concave washer is installed in the head of the taper sleeve, and then a bolt body is screwed in. The inner surface of the taper sleeve is in conical surface fit with the outer surface of the taper pin, and the concave washer is in clearance fit with the taper sleeve. And a hole is formed in the center of the concave washer, and a bolt penetrates through the hole to be connected with a threaded hole in the center of the taper pin. The taper sleeve and the torque transmission hole on the connected part adopt clearance fit so as to be convenient for installation. After the installation is finished, the taper pin expands the taper sleeve outwards due to the tensioning effect of the bolt body, so that the gap between the taper sleeve and the torque transmission hole is eliminated, and a certain expansion force is generated. In this way, the taper bolt has good positioning with the coupled part. But after the taper pin expands the taper sleeve outwards, the bolt assembly is inconvenient to disassemble; and during the installation process, the taper pin needs the top taper sleeve to expand the taper pin, so that the installation of the bolt assembly is relatively laborious. And the shaft coupling of this patent can only pass through the shearing and transmit the turn round, can't realize the friction and transmit the turn round simultaneously.

To sum up, at present, a coupler which can simultaneously transmit torque through friction and shearing and can ensure accurate centering and is convenient to mount and dismount is lacking.

The present invention has been made in view of the above problems.

Disclosure of Invention

The invention mainly aims to provide a coupler, which aims to solve the problems that a coupler capable of simultaneously rubbing and shearing torque transmission cannot accurately ensure centering and is inconvenient to mount and dismount in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a coupling including a first flange and a second flange connected to a shaft to be connected, respectively, a connecting structure connecting the first flange and the second flange; the connecting structure comprises a first connecting part and a second connecting part, wherein the first connecting part comprises a screw hole and a threaded connecting piece, the screw hole is formed in the first flange and the second flange, at least part of the threaded connecting piece penetrates through the screw hole, and the threaded connecting piece penetrates through the screw hole to be connected with the first flange and the second flange; wherein the second connecting portion includes the position sleeve that keeps first flange, second flange centering, and the position sleeve sets up to wear to establish in first flange, second flange partially, and the position sleeve sets up to be adjacent and support threaded connection spare at least in radial direction with the screw. The positioning sleeve can ensure the accurate centering of the coupler, can be matched with the threaded connecting piece to realize shearing and torque transmission, and is in clearance fit with the threaded connecting piece, so that the coupler is convenient to mount and dismount.

Further, the positioning sleeve comprises a protruding portion protruding relative to the screw hole, and the protruding portion defines an inner cavity for the threaded connecting piece to at least partially penetrate through. First, the positioning sleeve is arranged in the first flange and the second flange, and the positioning sleeve stretches across the first flange and the second flange, so that the first flange and the second flange are accurately centered. And the positioning sleeve is provided with an inner cavity formed by the convex part, so that at least part of the threaded connecting piece support frame penetrating through the inner cavity is arranged in the screw hole, and the threaded connecting piece can not directly contact with the screw hole. Therefore, when the threaded connecting piece is screwed down, the deformation of the screw hole and the threaded connecting piece cannot influence the accurate centering.

Further, the protruding part is circular ring-shaped. The bulge is arranged in a ring shape, so that the processing is convenient, and the bulge is convenient to match with a threaded connecting piece.

Further, the protruding portion is arranged coaxially with the screw hole. The arrangement is convenient for the threaded connecting piece to at least partially penetrate through the inner cavity formed by the bulge.

Further, the positioning sleeve and the threaded connecting piece at least partially arranged in the threaded hole in a penetrating mode are in shearing action to transmit torque. The positioning sleeve and the threaded connecting piece shear and transmit torque, so that the torque required for friction and transmission torque can be reduced, the tensile tightening force of the threaded connecting piece is reduced, and the service life of the threaded connecting piece is prolonged.

Furthermore, the threaded connecting piece is a variable diameter bolt, and the diameter of the inner cavity part of the bolt penetrating through the positioning sleeve is larger than that of other parts. The threaded connecting piece is set to be a reducing bolt, so that the threaded connecting piece can be prevented from contacting with the screw hole, and the centering accuracy is further prevented from being influenced by the deformation of the threaded connecting piece and the screw hole. And the diameter of the part of the threaded connecting piece, which is positioned outside the positioning sleeve, is smaller, so that the threaded connecting piece and the positioning sleeve can be conveniently installed in a matched manner.

Furthermore, the positioning sleeve is surrounded by more than two annular sections; the second connecting part also comprises a fixing device for fixedly mounting the positioning sleeve in the first flange and the second flange, and the fixing device is used for fixing all the annular sections. Because the positioning sleeve is formed by splicing a plurality of annular sections, the annular sections can move along the radial direction to adjust the outer diameter of the positioning sleeve, and the positioning sleeve and the screw hole can be installed and matched.

Furthermore, the fixing device comprises a first sleeve and a second sleeve, and the first sleeve is axially extruded with all annular sections of the positioning sleeve and is in limit abutment with the annular sections; one end of the second sleeve is abutted against the first sleeve, and the other end of the second sleeve is abutted against the axial fixing structure of the first flange or the second flange. The positioning sleeve is fixedly divided into a plurality of annular sections through the first sleeve and the second sleeve.

Furthermore, the end face of the first sleeve, which is opposite to the annular section, is a conical surface inclined at a set angle; the annular section bears the extrusion action of the first sleeve, and the annular section is in sliding contact with the conical surface and is fixed at the abutting position. The conical surface of the first sleeve extrudes the annular section, so that the annular section can be guaranteed to be finally abutted against the conical surface to fix the annular section, and then the fixing of the positioning sleeve is realized.

Further, the fixing device comprises a set screw for applying axial fastening load, and a fixing groove for the set screw to pass through; the axial fixed knot of first flange or second flange constructs for the nut, sets up the fixed slot on the nut, and holding screw passes the fixed slot and links to each other with the second sleeve. And the fastening load applied by the fastening screw ensures the stable fixation of the first sleeve and the second sleeve.

Further, the locating sleeve is symmetrical about the end face where the first flange and the second flange are in contact. The positioning sleeve is symmetrically arranged around the end face, so that the positioning sleeve is uniformly stressed, the position stability of the positioning sleeve is facilitated, and the accurate centering of the coupler is further facilitated through the positioning sleeve.

Further, the axial extension length of the positioning sleeve is smaller than that of the screw hole. The positioning sleeve only needs to extend for one section at the position where the first flange and the second flange are contacted, so that the material can be saved, and the processing is convenient.

Further, the locating sleeve is of a rigid structure.

In order to achieve the above object, according to one aspect of the present invention, there is provided a nut provided in a coupling: nut grooves are respectively arranged in the first flange and the second flange, the nut grooves are through grooves with openings at two ends, one end opening of each nut groove is arranged on the outer end face of the corresponding first flange or second flange, and the other end opening of each nut groove is connected with the screw hole; the nut is embedded in the nut groove and is in threaded connection with the threaded connecting piece.

Further, the nut embedded in the nut groove has a frictional contact surface with the nut groove. After the threaded connecting piece is screwed down, the friction between the nut and the nut groove realizes the function of friction torque transmission.

Further, the nut is a ball nut. The ball nut facilitates maintaining contact with the nut groove.

Furthermore, the friction contact surface of the ball nut and the nut groove is a spherical surface. The friction contact surface is arranged to be a spherical surface, so that the nut can be contacted with the nut groove no matter where the nut is screwed down, and the friction contact surface is convenient for well maintaining the vertical position relation between the screw hole and the flange surface.

The technical scheme of the invention has the following advantages:

1. the positioning sleeve arranged in the coupler can keep the coupler accurately centered.

2. The shaft coupling accessible locating sleeve and threaded connection's cooperation realizes shearing the transmission and turns round to threaded connection can realize the friction transmission with first flange, second flange and turn round.

3. The positioning sleeve of the coupler is in clearance fit with the threaded connecting piece, so that the coupler is convenient to mount and dismount.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a coupling according to the invention; and

FIG. 2 shows an enlarged partial schematic view of a coupling according to the present invention; and

fig. 3 shows a schematic structural view of a coupling according to embodiment 3 of the present invention; and

fig. 4 shows a partially enlarged schematic view of a coupling according to embodiment 3 of the invention; and

FIG. 5 shows a schematic cross-sectional view of a positioning sleeve according to embodiment 3 of the invention; and

fig. 6 is an exploded view showing the cone pressing force according to embodiment 3 of the present invention; and

fig. 7 shows a schematic end view of a nut according to embodiment 3 of the present invention.

Wherein the figures include the following reference numerals:

1. a first flange; 2. a second flange; 3. a screw hole; 4. a threaded connection; 5. a positioning sleeve; 6. a projection; 7. an inner cavity; 8. an embedded portion; 9. an end face; 10. a nut groove; 11. a nut; 12. an annular segment; 13. a first sleeve; 14. a second sleeve; 15. a conical surface; 16. tightening the screw; 17. and fixing the grooves.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The present invention is described in further detail below with reference to specific examples, which are not to be construed as limiting the scope of the invention as claimed.

In the mechanical field, two shafts to be connected are usually connected by a coupling, so that the different shafts are connected together for common rotation. The torque transmission mode of the coupler comprises a friction torque transmission mode and a shearing torque transmission mode, for low-power rotating machinery, transmission between two connected shafts can be achieved only through the friction torque transmission mode, and for high-power driving machinery, the shearing torque transmission mode and the friction torque transmission mode are required to act together. The coupler capable of simultaneously shearing and transmitting torque and friction and transmitting torque has longer relative service life. For couplings that transmit torque by shearing, an accident will occur if the centering is not accurate. However, the coupler in the prior art is inconvenient to install and disassemble if the coupler can be accurately centered. In view of the above technical problems, the present invention discloses a coupling capable of simultaneously transmitting friction torque and shear torque, which can realize accurate centering and is convenient to install and disassemble.

Example 1

As shown in fig. 1, the coupling provided by this embodiment includes a first flange 1 and a second flange 2 respectively connected to a shaft to be connected, and a connection structure for connecting the first flange 1 and the second flange 2. After the first flange 1 and the second flange 2 are accurately centered, the first flange 1 and the second flange 2 are respectively connected with the shaft to be connected, and accurate centering of the two shafts can be guaranteed. Therefore, the connection structure provided by the embodiment can ensure the accurate centering of the first flange 1 and the second flange 2, and further ensure the accurate centering of two to-be-connected shafts.

The connecting structure comprises a first connecting part and a second connecting part, wherein the first connecting part comprises a screw hole 3 and a threaded connecting piece 4, the screw hole 3 is arranged in the first flange 1 and the second flange 2, and the screw hole 3 penetrates through the first flange 1 and the second flange 2. Screw hole 3 is worn to establish by threaded connection 4 at least part, and threaded connection 4 wears to establish screw hole 3 and connects first flange 1 and second flange 2. That is, the connection structure realizes the connection of the first flange 1 and the second flange 2 mainly through a threaded connection. The threaded connecting piece 4 needs to be in friction action with the first flange 1 and the second flange 2 in the screwing process, and friction torque transmission can be achieved.

Wherein the second connecting part comprises a positioning sleeve 5 for keeping the first flange 1 and the second flange 2 accurately centered. A positioning sleeve 5 is arranged to be partly arranged through the first flange 1, the second flange 2, the positioning sleeve 5 being arranged adjacent to the threaded hole 3 and supporting the threaded connection 4 at least in the radial direction. Firstly, the locating sleeve 5 crosses the first flange 1 and the second flange 2 in the screw hole 3, namely, the locating sleeve 5 is partially embedded in the first flange 1 and partially in the second flange 2, so long as the mounting position of the locating sleeve 5 is correct, the first flange 1 and the second flange 2 can be accurately centered, and the threaded connecting piece 4 is at least partially arranged in the locating sleeve 5 in a penetrating manner, so that the threaded connecting piece 4 is connected with the first flange 1 and the second flange 2 which are accurately centered. Secondly, the positioning sleeve 5 supports the threaded connecting piece 4 in the radial direction, so that the threaded connecting piece 4 does not need the support of the screw hole 3, and further the deformation of the screw hole 3 and the threaded connecting piece 4 in the process of screwing the threaded connecting piece 4 does not influence the accurate centering of the first flange 1 and the second flange 2.

As shown in particular in fig. 1, the positioning sleeve 5 comprises a projection 6 projecting with respect to the threaded hole 3, the projection 6 defining an inner cavity 7 through which the threaded connection 4 is at least partially inserted. The threaded connecting piece 4 can be erected in the screw hole 3 through the protruding part 6, so that the threaded connecting piece 4 cannot be directly contacted with the screw hole 3, and further the influence of the deformation of the threaded connecting piece 4 and the screw hole 3 on the centering of the first flange 1 and the second flange 2 in the process of connecting the first flange 1 and the second flange 2 is avoided.

Preferably, the projection 6 is circular. Further preferably, the projection 6 is arranged coaxially with the threaded bore 3. I.e. the shape of the protrusion 6, facilitates the structure to be easily machined and to be easily adapted to the cylindrical threaded connection 4. The bulge 6 and the screw hole 3 are coaxially arranged, so that after the threaded connecting piece 4 is installed, the part of the threaded connecting piece in the bulge 6 is well centered, and the threaded connecting piece 4 is prevented from generating unnecessary bending moment stress due to deflection and being damaged.

The positioning sleeve 5 can not only facilitate the accurate centering effect in the installation process of the coupler, but also realize the shearing and torque transmission effect. Specifically, the positioning sleeve 5 and the threaded connecting piece 4 at least partially penetrating the screw hole 3 shear to transmit torque. Namely, the coupling can realize the rotation transmission between two shafts to be connected in a shearing and torque transmission mode through the connection mode of the positioning sleeve 5 and the threaded connecting piece 4. Thus, the coupling can reduce the torque value of the friction torque transmission, and the tensile tightening force of the threaded connector 4 can be reduced, so that the life of the threaded connector 4 can be prolonged.

Regarding the specific structure of the threaded connection 4: preferably, the threaded connector 4 is a variable diameter bolt, and the diameter of the part of the threaded connector 4 penetrating through the inner cavity 7 of the positioning sleeve 5 is larger than that of the other parts. Since the inner chamber 7 protrudes from the threaded bore 3, the threaded connection 4 actually only comes into contact with the inner chamber 7 inside the threaded bore 3. Therefore, the threaded connecting piece 4 is arranged into the reducing bolt, so that the threaded connecting piece 4 is not in contact with the screw hole 3 more conveniently, and accurate centering is facilitated.

Further preferably, the inner cavity 7 of the threaded connecting piece 4 and the positioning sleeve 5 are in clearance fit, and the clearance fit facilitates installation of the threaded connecting piece 4 and the positioning sleeve 5 and installation and disassembly of the coupler.

The positioning sleeve 5 comprises an embedded part 8 fixed with the first flange 1 and the second flange 2. As shown in fig. 1, the embedded portion 8 may contact and abut with the first flange 1 and the second flange 2, and plays a role of embedding and fixing the positioning sleeve 5 in the screw hole 3, so that the embedded portion 8 should have a certain thickness in the radial direction. Preferably, the radial thickness of the embedded portion 8 of the positioning sleeve 5 is a first thickness, and the radial thickness of the protruding portion 6 of the positioning sleeve 5 is a second thickness, and the first thickness is greater than the second thickness. The radial thickness of the embedded part 8 is relatively thick, so that the embedded part 8 can better support the protruding part 6, and the positioning sleeve 5 is relatively stable. When actually installing the locating sleeve 5, the embedded part 8 of the locating sleeve 5 can be ground on site as required, and the locating sleeve 5 can be installed to a required position. Due to the arrangement, the requirement on precision is lower when the positioning sleeve 5 is machined, and machining is facilitated.

Further preferably, in order to make the stress on the positioning sleeve 5 relatively uniform, the positioning sleeve 5 is symmetrical about the end surface 9 where the first flange 1 and the second flange 2 are in contact. The positioning sleeve 5 is symmetrically arranged relative to the end face 9, so that the positioning sleeve 9 is easy to keep balance and more stable.

It is further preferred that the axial extension of the positioning sleeve 5 is smaller than the axial extension of the threaded bore 3. That is, the utility model has the advantages of the reality, positioning sleeve 5 only need through boss 6 erect threaded connection spare 4 in screw 3 can, positioning sleeve 5 only need along the axial extension a segment alright realize the support of erectting threaded connection spare 4, so positioning sleeve 5 need not follow the axial extension overlength. Preferably, the threaded connection 4 extends axially further than the axial length of the threaded bore 3. The positioning sleeve 5 may extend a short distance at the position where the first flange 1 and the second flange 2 are in contact. This achieves a material saving effect.

It is further preferred that the positioning sleeve 5 extends in the first flange 1 for a length equal to half the extension of the threaded bore 3 in the first flange 1, and that the positioning sleeve 5 extends in the second flange 2 for a length equal to half the extension of the threaded bore 3 in the second flange 2. The positioning sleeve 5 extends according to the axial length, so that the radial support of the threaded connecting piece 4 and the shearing and torque transmission of the threaded connecting piece 4 can be guaranteed, and the positioning sleeve 5 cannot be overlong and waste materials.

Since the positioning sleeve 5 in this embodiment needs to be sheared with the threaded connection 4 to transmit torque, it is preferable that the positioning sleeve 5 has a rigid structure in order to ensure the strength of the positioning sleeve 5.

The positioning sleeve 5 that sets up in the shaft coupling of this embodiment can with 4 looks shearing actions of threaded connection spare in order to realize shearing the biography and turn round to positioning sleeve 5 can erect threaded connection spare 4 again and support in screw 3, guarantees the accurate centering of shaft coupling through positioning sleeve 5's structure, avoids the deformation influence centering accuracy of screw 3 and threaded connection spare 4 self. And the 5 location sleeves of this embodiment and 4 clearance fit of threaded connection spare, the threaded connection spare 4 of being convenient for is fixed first flange 1, second flange 2, and then is convenient for the installation of shaft coupling.

Example 2

The present embodiment provides a coupling based on the above embodiments. The structure of the first flange 1, the second flange 2 and the positioning sleeve 5 in this embodiment is as in embodiment 1, except that in this embodiment, nut grooves 10 are provided on the first flange 1 and the second flange 2 to fix nuts 11, and the first flange 1 and the second flange 2 are fixed by the threaded connection between the nuts 11 and the threaded connection members 4.

As shown in fig. 1, in order to fix the first flange 1 and the second flange 2 to the threaded connector 4, the threaded connector 4 needs to be fixed by tightening a nut 11 on the outside. If the nut grooves 10 are not provided in the first and second flanges 1 and 2, the screw connection members 4 need to be protruded to the outside of the first and second flanges 1 and 2 and fixed by fixing nuts 11 on the outer end surfaces of the first and second flanges 1 and 2. This results in the nuts 11 protruding outside the first and second flanges 1, 2, which is aesthetically undesirable, and the threaded connectors 4 need to extend a long distance and lack a limit for the nuts 11.

Preferably, the present embodiment provides that the nut grooves 10 are respectively arranged in the first flange 1 and the second flange 2, so that the nuts 11 can be embedded in the first flange 1 and the second flange 2, and the extension length of the threaded connecting piece 4 is correspondingly reduced. The nut grooves 10 are through grooves with openings at two ends, one end of each nut groove 10 is provided with an opening on the outer end face of the corresponding first flange 1 or second flange 2, and the nuts 10 can be installed in the first flange 1 and the second flange 2 through the openings; the other end of the nut groove 10 is open and connected to the screw hole 3 so that the threaded connecting member 4 can be brought into contact with the nut 10 through the opening to effect threaded connection of the threaded connecting member 4 to the nut 11.

As shown in fig. 2, the nut 11 embedded in the nut groove 10 has a frictional contact surface with the nut groove 10. Since the nut groove 10 and the nut 11 can frictionally interact, friction torque transmission can be realized. Preferably, the nut 11 is a ball nut. More preferably, the frictional contact surface between the ball nut and the nut groove 10 is a spherical surface. The friction contact surface can be a spherical surface by using the ball nut, so that the ball nut can be ensured to be in contact with the end surface of the nut groove 10 no matter the nut rotates to any position, and the ball nut is convenient to mount. And no matter what position the ball nut rotates to, the ball nut can be abutted and limited with the nut groove 10, and then the perpendicular relation between the center of the screw hole 3 and the first flange 1 and the second flange 2 is well maintained.

Example 3

The present embodiment provides another form of coupling based on the above embodiment, and the coupling also includes a positioning sleeve 5, but the sleeve 5 provided in the present embodiment is a structure spliced by multiple annular segments 12, so that the radial dimension of the positioning sleeve 5 itself can be adjusted. When the positioning sleeve 5 is installed in the first flange 1 and the second flange 2, the radial size of the positioning sleeve 5 can be adjusted by moving each ring segment 12, so that the positioning sleeve 5 is conveniently and fixedly matched with the first flange 1 and the second flange 2. The second connection also comprises fixing means for fixedly mounting the positioning sleeve 5 in the first flange 1, the second flange 2. After the plurality of annular segments 12 are matched with the first flange 1 and the second flange 2 in place, the plurality of annular segments 12 forming the positioning sleeve 5 can be fixed through the fixing device.

In the coupling in embodiments 1 and 2, when the positioning sleeve 5 is installed, the screw holes 3 in the first flange 1 and the second flange 2 or the outer circumference of the positioning sleeve 5 needs to be ground on site, so that the positioning sleeve 5 can be fixed inside the screw holes 3. The positioning sleeve 5 is troublesome to install and needs to be ground on site. And the shaft coupling that this embodiment provided, because locating sleeve 5 is the structure of segmentation concatenation, the outer circumference diameter of locating sleeve 5 is adjustable for need not pass through on-the-spot match grinding when installing locating sleeve 5 also can guarantee that locating sleeve 5 cooperatees with first flange 1, second flange 2.

As shown in fig. 3-5, the alignment sleeve 5 is defined by more than two annular segments 12. Specifically, as shown in the cross-sectional view of the retainer sleeve 5 in fig. 5, the circumference of the cross-section of the ring segment 12 is divided into a plurality of ring segments 12. And the specific division manner of the ring segments 12 can be designed according to the needs, for example, as shown in fig. 5, the interval δ between the ring segments 12 can be set according to the needs.

In the present embodiment, the positioning sleeve 5 is divided into 3 annular segments as an example, and when the positioning sleeve 5 is installed, the 3 annular segments 12 can be assembled. Each section of the annular section 12 can move along the radial direction of the positioning sleeve 5, and when the annular section 12 moves outwards along the radial direction of the positioning sleeve 5, the diameter of the positioning sleeve 5 is enlarged; the ring segments 12, when moved radially inwardly of the locator sleeve 5, cause the diameter of the locator sleeve 5 to decrease. The diameter of the outer edge of the positioning sleeve 5 at different positions can be changed through the radial movement of the ring section 12, so that the positioning sleeve 5 is conveniently fixedly matched with the first flange 1 and the second flange 2.

After the above-mentioned multiple ring segments 12 constituting the positioning sleeve 5 are spliced, all the ring segments 12 may be fixed by a fixing device to keep the positioning sleeve 5 fixed in the first flange 1 and the second flange 2. As shown in fig. 3 and 4, the fixing device comprises a first sleeve 13 and a second sleeve 14, wherein the first sleeve 13 is axially pressed and in limit abutment with all the annular sections 12 of the positioning sleeve 5; one end of the second sleeve 14 abuts against the first sleeve 13, and the other end abuts against an axial fixing structure of the first flange 1 or the second flange 2. The first sleeve 13 and the second sleeve 14 need to be embedded in the screw holes 3 in the first flange 1 and the second flange 2. Since the second sleeve 14 abuts against the axially immovable fixed structure, the axial displacement of the second sleeve 14 is limited, that is, the axial displacement of all the ring segments 12 in the positioning sleeve 5 can be limited by the first sleeve 13 and the second sleeve 14, so that the first sleeve 13 and the second sleeve 14 are axially fixed.

As shown in fig. 3 and 4, the end surface of the first sleeve 13 opposite to all the ring segments 12 is a tapered surface 15 inclined at a set angle. The first sleeve 13, when fitted into the threaded bore 3, may exert a squeezing action on the ring segment 12 in the positioning sleeve 5. As shown in fig. 4, the inclination angle α can be set by itself as needed. After the annular section 12 bears the squeezing action of the first sleeve 13, the annular section 12 can slide along the conical surface 15 under the action of thrust and is finally abutted and limited with the conical surface. The thrust force F3 exerted by the first sleeve 13 is shown in fig. 6, and the thrust force F3 can be decomposed into a component force F1 in the axial direction and a component force F2 in the radial direction. Wherein the component F1 of the thrust force in the axial direction is balanced with the axial load applied when the first sleeve 13 is mounted. The component F2 of the radial thrust force can move the annular segment 12 of the positioning sleeve 5 in the radial direction, and thus move the annular segment 12 to a position where it can be in abutting contact with the threaded hole 3, so that the annular segment 12 is finally fixed firmly to the threaded hole 3. I.e. the conical shape of the first sleeve 13 in this embodiment, so that the radial position of the ring segment 12 can be adjusted by the mutual pressing of the first sleeve 13 and the ring segment 12, so that the ring segment 12 can finally be fixed in the threaded hole 3. The first sleeve 13 is in turn secured by pressing against the second sleeve 14. And all the ring segments 12 in the positioning sleeve 5 can be fixed by cooperation with the first sleeve 13 and the second sleeve 14.

After a positioning sleeve 5, a first sleeve 13 and a second sleeve 14 which are formed by splicing a plurality of annular sections 12 are installed in a screw hole 3 in a first flange 1 and a second flange 2, and all the parts are installed in place, the devices are fastened. The fixing means includes a set screw 16 applying an axially fastening load, and a fixing groove 17 through which the set screw 16 passes. As shown in fig. 1 and 2, the axial fixing structure of the first flange 1 or the second flange 2 may be a nut 11, a fixing groove 17 is provided on the nut 11, and a set screw 16 passes through the fixing groove 17 to connect with the second sleeve 14. A set screw 16 is penetrated into the nut 11, and the second sleeve 14 and the first sleeve 13 can be further pressed and fastened by screwing in the set screw 16; and because the nut 11 is a fixed structure after being screwed, after the set screw 16 is fastened with the second sleeve 14, the second sleeve 14 is ensured to be stably fixed, and further the first sleeve 13 connected with the second sleeve is also stably fixed. As shown in fig. 7, a plurality of fixing grooves 17 are provided on an outer end surface of the nut, and are fastened by a plurality of fastening screws 16.

The utility model provides a positioning sleeve 5 in the shaft coupling is the concatenation sleeve that forms by the concatenation of multistage ring segment 12 to fixing device such as first sleeve 13, second sleeve 14 fasten multistage ring segment 12, make need not carry out the on-the-spot finish grinding when installation positioning sleeve 5 and just guarantee that positioning sleeve 5 fixes in screw 3.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. according to the coupler provided by the invention, the coupler can be ensured to be accurately centered through the positioning sleeve arranged in the coupler, and the positioning sleeve spans the two flanges, so that the accurate centering of the first flange and the second flange is ensured. And the bulge of the positioning sleeve protrudes out of the screw hole, the threaded connecting piece is erected and supported in the screw hole by the bulge, and the threaded connecting piece is not in direct contact with the screw hole, so that the screw hole or the deformation of the threaded connecting piece cannot influence the accurate centering of the coupler.

2. The positioning sleeve provided by the invention can be mutually sheared with the threaded connecting piece to transmit torque, and the threaded connecting piece can be in friction action with the first flange and the second flange to transmit torque. The positioning sleeve can transmit torque by friction and can transmit torque by shearing, so that the stretching and screwing of the threaded connecting piece are reduced, and the service life of the threaded connecting piece is prolonged.

3. According to the coupler, the positioning sleeve and the threaded connecting piece are in clearance fit, so that the threaded connecting piece is easy to assemble with the positioning sleeve, and the coupler is convenient to mount and dismount.

4. The positioning sleeve is simple in structure, convenient to machine and install, short in axial extension and capable of saving materials.

5. The nut groove capable of embedding the nut is arranged in the coupler, so that the attractiveness of the coupler can be kept; and the nut itself adopts the ball nut for no matter the nut rotates to any angle all can guarantee with the spacing butt of nut groove mutually.

6. The positioning sleeve in the coupler is of a split-splicing structure, so that the positioning sleeve can adjust the radial size conveniently, and the positioning sleeve can be fixedly mounted in the first flange and the second flange conveniently. And the first flange and the second flange of the coupler are internally provided with fixing devices capable of fixing the partitioned positioning sleeves, so that the positioning sleeves can be stably fixed in the first flange and the second flange. Namely, the positioning sleeve of the invention does not need to be ground on site during installation, and can be conveniently installed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.