Couplings and power transmission devices

Abstract

The present invention discloses a coupling and a power transmission device, which relate to the field of mechanical transmission and are used to optimize the structure and performance of the coupling. The coupling includes a first sleeve, a second sleeve and a rope. The first sleeve has a first mounting hole and a plurality of recessed parts, the central axis of the first mounting hole is along the central axis of the first sleeve, and the plurality of recessed parts surround the first mounting hole. The second sleeve is installed in the first mounting hole, and a groove is provided at the first end of the second sleeve. The two ends of the rope are located in the recessed part, and the middle of the rope is stuck in the groove to transmit torque between the first sleeve and the second sleeve. In the coupling provided by the above technical solution, there is no radial limiting structure between the first sleeve and the second sleeve, which greatly reduces the requirements for the coaxiality of the first connecting shaft and the second connecting shaft, so that the first connecting shaft and the second connecting shaft can still effectively transmit torque even if there is a large coaxiality deviation.

Description

Technical Field

[0001] The invention relates to the field of mechanical transmission, and in particular to a coupling and a power transmission device. Background Art

[0002] The coupling is used to transfer torque between two shafts. There are many types of coupling structures, and the most commonly used ones are diaphragm type and snake spring type couplings.

[0003] The inventors have found that the prior art has at least the following problems: these couplings have very high requirements for the coaxiality of the two connected shafts. When there is a coaxiality deviation between the two shafts, the entire transmission system will experience relatively large vibrations and the transmission system cannot operate stably. Summary of the invention

[0004] The present invention provides a coupling and a power transmission device to optimize the performance of the coupling.

[0005] An embodiment of the present invention provides a coupling, comprising:

[0006] A first sleeve having a first mounting hole and a plurality of inner recesses, wherein the central axis of the first mounting hole is along the central axis of the first sleeve, and the plurality of inner recesses surround the first mounting hole;

[0007] a second sleeve installed in the first installation hole, and a first end of the second sleeve is provided with a groove; and

[0008] A rope, both ends of which are located in the inner recess, and the middle of which is stuck in the groove, so as to transmit torque between the first sleeve and the second sleeve.

[0009] In some embodiments, the coupling further comprises:

[0010] an elastic member, at least partially located in the inner recess; and

[0011] A limiting member is provided at the end of the rope located outside the inner recess, and the elastic member is constructed to be located between the bottom wall of the inner recess and the limiting member in a compressed manner.

[0012] In some embodiments, the rope includes a first rope and a second rope, the inner concave parts are provided in two pairs, and the grooves include a first groove and a second groove that intersect each other;

[0013] Partial areas of the first rope are respectively located in one of the pairs of inner recesses, and a middle portion of the first rope is located in the first groove;

[0014] Partial areas of the second rope are respectively located in the other pair of the inner recesses, and the middle portion of the second rope is located in the second groove.

[0015] In some embodiments, two of each pair of the inner recesses are arranged at 180° on the first sleeve.

[0016] In some embodiments, the first groove and the second groove are perpendicular, and a depth of the first groove is greater than a depth of the second groove.

[0017] In some embodiments, the inner recess is configured to be formed by being recessed from a hole wall of the first mounting hole.

[0018] In some embodiments, the first sleeve comprises:

[0019] A first section of the shaft sleeve, the first mounting hole and the inner recess are both provided in the first section of the shaft sleeve; and

[0020] The second section of the shaft sleeve is provided with a second mounting hole for mounting the first connecting shaft, and the second mounting hole is communicated with the first mounting hole.

[0021] In some embodiments, the second bushing includes a third mounting hole for mounting the second connecting shaft, and the third mounting hole is coaxial or non-coaxial with the second mounting hole.

[0022] In some embodiments, the first sleeve is provided with a first locking hole penetrating through the thickness direction of its own wall; and / or, the second sleeve is provided with a second locking hole penetrating through the thickness direction of its own wall.

[0023] An embodiment of the present invention further provides a power transmission device, comprising a coupling provided by any technical solution of the present invention.

[0024] The coupling provided by the above technical solution includes a first sleeve, a second sleeve and a rope. The rope is used to transmit torque between the first sleeve and the second sleeve. The rope itself has a stable and reliable structure and a strong load-bearing capacity. In addition, there is no radial limit structure between the first sleeve and the second sleeve, which greatly reduces the requirements for the coaxiality of the first connecting shaft and the second connecting shaft, so that the first connecting shaft and the second connecting shaft can still effectively transmit torque even if there is a large coaxiality deviation, and the transmission system will not vibrate due to the coaxiality deviation, so that the transmission system can operate stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1A schematic diagram of the three-dimensional structure of a coupling provided in an embodiment of the present invention;

[0027] Figure 2a A schematic diagram of the main structure of a coupling provided in an embodiment of the present invention;

[0028] Figure 2b A schematic cross-sectional view of a coupling in the main view direction provided by an embodiment of the present invention;

[0029] Figure 2c A schematic diagram of the bending of the rope during the operation of the coupling provided by an embodiment of the present invention;

[0030] Figure 3a A schematic cross-sectional view of a first shaft sleeve of a coupling provided in an embodiment of the present invention in a front view direction;

[0031] Figure 3b A schematic top view of a first shaft sleeve of a coupling provided in an embodiment of the present invention;

[0032] Figure 4a A schematic front view of a second shaft sleeve of a coupling provided in an embodiment of the present invention;

[0033] Figure 4b A schematic cross-sectional view of the second shaft sleeve of the coupling provided by an embodiment of the present invention in the main viewing direction;

[0034] Figure 4c A schematic top view of a second shaft sleeve of a coupling provided in an embodiment of the present invention;

[0035] Figure 4d A bottom view schematically showing a second shaft sleeve of a coupling provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Combine the following Figure 1 to Figure 4d The technical solution provided by the present invention is described in more detail.

[0037] See also Figure 1 The embodiment of the present invention provides a coupling for connecting a first connecting shaft and a second connecting shaft. The coupling includes a first sleeve 1, a second sleeve 2 and a rope 3. The first sleeve 1 is used to connect with the first connecting shaft. The second sleeve 2 is used to connect with the second connecting shaft. The rope 3 is used to transmit torque between the first sleeve 1 and the second sleeve 2.

[0038] The first sleeve 1 has a first mounting hole 11 and a plurality of inner recesses 12, the central axis of the first mounting hole 11 is along the central axis of the first sleeve 1, and the plurality of inner recesses 12 surround the first mounting hole 11. The second sleeve 2 is mounted in the first mounting hole 11, and a groove 21 is provided at the first end of the second sleeve 2. In some embodiments, the rope 3 is divided into five parts from one end to the other end, namely, a first end 3a, a first section 3b, a middle section 3c, a second section 3d, and a second end 3e. The first end 3a and the second end 3e of the rope 3 are located outside the inner recess 12, the first section 3b and the second section 3d are located inside the inner recess 12, and the middle section 3c of the rope 3 is stuck in the groove 21 to transmit torque between the first sleeve 1 and the second sleeve 2. The first section 3b and the second section 3d of the rope 3 are located inside the inner recess 12, and these two parts are blocked by the outer wall of the second sleeve 2 to prevent the rope 3 from falling off from the inner recess 12 along the radial direction of the first sleeve 1. In some embodiments, the inner recess 12 is configured to be formed by being recessed from the hole wall of the first installation hole 11. This arrangement makes the installation of the rope 3 very convenient.

[0039] Rope 3 can be a steel wire rope. The structure of the steel wire rope is stable and reliable, and the bearing capacity is strong. In addition, there is no radial limit structure between the first sleeve 1 and the second sleeve 2, which greatly reduces the requirements for the coaxiality of the first connecting shaft and the second connecting shaft, so that the first connecting shaft and the second connecting shaft can still effectively transmit torque even if there is a large coaxiality deviation, and the transmission system will not vibrate due to the coaxiality deviation, so that the transmission system can operate stably.

[0040] See also Figure 1 to Figure 2b In some embodiments, the coupling further comprises an elastic member 4, and the elastic member 4 is at least partially located in the inner recess 12. A limit member 5 is provided at the end of the rope 3 located outside the inner recess 12, and the elastic member 4 is constructed to be located between the bottom wall of the inner recess 12 and the limit member 5 in a compressed manner. The limit members 5 include a plurality of limit members 5, and the first end 3a and the second end 3e of the rope 3 are each fixedly connected to a limit member 5. The limit member 5 prevents the first end 3a and the second end 3e of the rope 3 from retracting into the inner recess 12 under the action of external force, thereby preventing torque transmission failure and ensuring normal torque transmission between the first sleeve 1 and the second sleeve 2.

[0041] The elastic member 4 is, for example, a spring. In the initial state, the elastic member 4 is slightly compressed. During the operation of the coupling, the second sleeve 2 is subjected to the force exerted by the second connecting shaft, and may move in its own radial direction. During the movement, the second sleeve 2 will cause a certain displacement of the rope 3, and this displacement is manifested as pulling on the rope 3. After the pulling, the length of one end of the wire rope extending out of the second mounting hole 141 becomes longer, and the length of the other end of the wire rope extending out of the second mounting hole 141 naturally becomes shorter. Then the elastic member 4 at one end of the wire rope is compressed less, and the elastic member 4 at the other end of the wire rope is compressed more. The change in the deformation of the two elastic members 4 plays a role in buffering vibration.

[0042] See also Figure 1 In some embodiments, the rope 3 includes a first rope 31 and a second rope 32, and the ends of the first rope 31 and the second rope 32 are respectively located outside the second mounting hole 141. Two pairs of inner recesses 12 are provided, and the grooves 21 include a first groove 211 and a second groove 212 that intersect each other. Partial areas of the first rope 31 are respectively located in one pair of inner recesses 12, and the middle part of the first rope 31 is located in the first groove 211. Partial areas of the second rope 32 are respectively located in one pair of inner recesses 12, and the middle part of the second rope 32 is located in the second groove 212.

[0043] See also Figure 1 to Figure 2b Specifically, the first end 3a of the first rope 31 is located outside one of the second mounting holes 141 of the pair. The first section 3b of the first rope 31 is located in one of the second mounting holes 141 of the pair. The middle section 3c of the first rope 31 is located in the first groove 211. The second section 3d of the first rope 31 is located in the other second mounting hole 141 of the pair. The second end 3e of the first rope 31 is located outside the other second mounting hole 141 of the pair.

[0044] Continue to see Figure 1 to Figure 2b , the first end 3a of the second rope 32 is located outside one of the second mounting holes 141 in the other pair. The first section 3b of the second rope 32 is located in one of the second mounting holes 141 in the other pair. The middle section 3c of the second rope 32 is located in the second groove 212. The second section 3d of the second rope 32 is located in the other second mounting hole 141 in the other pair. The second end 3e of the second rope 32 is located outside the other second mounting hole 141 in the other pair.

[0045] In some embodiments, two of each pair of inner recesses 12 are arranged at 180° on the first sleeve 1. This arrangement and structure makes the forces on the first sleeve 1 and the second sleeve 2 more balanced in the circumferential direction.

[0046] In some embodiments, the first groove 211 and the second groove 212 are perpendicular, and the depth of the first groove 211 is greater than the depth of the second groove 212. This arrangement matches the arrangement of the two pairs of second mounting holes 141, and enables the first rope 31 and the second rope 32 to be completely installed in the groove, preventing the first rope 31 and the second rope 32 from falling off the groove, so that the first rope 31 and the second rope 32 can stably transmit torque. This technical solution uses two steel wire ropes arranged vertically, corresponding to the cross groove at one end of the second sleeve 2, and can design and use the corresponding number of steel wire ropes according to the size of the transmission torque to achieve torque transmission in a larger working range.

[0047] In other embodiments, the number of ropes 3 is three or more. Multiple steel wire ropes need to be evenly distributed in the inner recesses 12 on the first sleeve 1, and the number of grooves at one end of the second sleeve 2 corresponds to the number of steel wire ropes and are evenly distributed. The steel wire ropes are straightened and installed on the first sleeve 1 to form a mesh layout, and the grooves of a section of the second sleeve 2 also present this mesh, and the second sleeve 2 can be directly pushed in.

[0048] See also Figures 1 to 3b In some embodiments, the first sleeve 1 includes a first sleeve section 13 and a second sleeve section 14. The first mounting hole 11 and the inner recess 12 are both provided on the first sleeve section 13. The second sleeve section 14 is provided with a second mounting hole 141 for mounting the first connecting shaft, and the second mounting hole 141 is connected to the first mounting hole 11. The first mounting hole 11 and the second mounting hole 141 may be coaxial or non-coaxial, and the above technical solution does not require the two to be coaxial. The above technical solution optimizes the product structure while ensuring reliable transmission, so that the number of product components is small, the structure is stable and reliable, and it is more adaptable to transmission under non-coaxial conditions.

[0049] See also Figure 1 The second sleeve 14 is also provided with a first locking hole 15 that penetrates the wall thereof. The first connecting shaft is inserted into the second mounting hole 141, and then a screw is installed in the first locking hole 15 to lock the second sleeve 14 and the first connecting shaft to prevent the first connecting shaft from axial movement. The first connecting shaft and the second mounting hole 141 are matched with a square hole or a polygonal hole. This structure can transmit torque without using other connection structures.

[0050] See also Figure 1In some embodiments, the second end of the second sleeve 2 is provided with a third mounting hole 22 for mounting the second connecting shaft, and the third mounting hole 22 is coaxial or non-coaxial with the second mounting hole 141. The second sleeve 2 is also provided with a second locking hole 23 that penetrates its wall, and the second connecting shaft is inserted into the third mounting hole 22, and then a screw is installed in the second locking hole 23 to lock the second sleeve 2 and the second connecting shaft to prevent the second connecting shaft from axial movement. The second connecting shaft and the third mounting hole 22 are matched with square holes or polygonal holes, and this structure can transmit torque without using other connection structures.

[0051] The following describes the installation method in actual application.

[0052] Installation method: First, install the two shaft parts of the coupling. You only need to leave enough space to install the coupling in place. The so-called in place means that the coupling provided by the embodiment of the present invention does not need a large amount of installation space like the traditional coupling, so that the assembly needs to follow a predetermined order. It can be installed without adjusting a larger installation space after the coupling part is installed. During installation, first press the second sleeve 2 into the cavity of the first sleeve 1, and put the whole into the space between the two shafts. First connect the first sleeve 1 with the transmission shaft at one end, and screw in the fastening screws on the side to tighten it in place; loosen the pressed second sleeve 2, and the second sleeve 2 pops outward due to the spring returning to its original state. At this time, connect the second sleeve 2 with the transmission shaft at the other end, and screw in the fastening screws to fix the installation position. The spring returns to its original shape in a compressed state, the total length of the spring increases, and the wire rope is pushed to move. The second sleeve 2 moves under the action of the wire rope.

[0053] When assembling the coupling, first put a spring through each end of the wire rope, then use the limiter 5 to limit the spring to keep it within the length of the wire rope, and then install the wire rope assembly into the first sleeve 1, with two groups distributed in total. The springs at both ends of each group of wire ropes are installed to a certain degree of compression within the elastic range to maintain the characteristic that the spring can deform in two directions within the elastic range when working. Then put the cross groove end of the second sleeve 2 into the first sleeve 1 facing the installed wire rope, and the cross groove is just stuck on the wire rope. The coupling parts are assembled.

[0054] After the coupling is assembled, the cross-section is as follows Figure 3a As shown, the second sleeve 2 is inserted into the power output end such as the motor shaft, and the first sleeve 1 is inserted into the end receiving the power. The two sleeves are connected and transmitted by a steel wire rope inserted into the cross groove of the second sleeve 2. The steel wire rope has a flexible feature and can realize non-differential vibration reduction transmission in both clockwise and counterclockwise directions. As a solid, only a very small part of the torque that the steel wire rope can transmit is lost due to friction.

[0055] The coupling provided by the above technical solution not only has outstanding advantages compared with diaphragm type and snake spring type couplings, but also has more outstanding advantages compared with magnetic couplings: the relationship between the magnetic torque and magnetic angle of the magnetic coupling basically follows a sine curve. When the magnetic angle is 0, it has a small magnetic torque; as the magnetic angle increases, the magnetic torque increases accordingly, and at 90 degrees, the magnetic torque reaches a maximum; thereafter, if the magnetic angle continues to increase, the magnetic torque decreases, that is, the magnetic torque in the range of 90-180 degrees decreases significantly, which is prone to slippage and unstable transmission; at the same time, magnetic couplings are only suitable for application scenarios with small transmission loads, while the developed flexible vibration damping coupling can adapt to the corresponding number of steel ropes according to changes in load, and can adapt to working conditions with a wider range of loads.

[0056] During operation, once the power output shaft partially bends due to load changes or the temperature of the shaft itself is too high, the power output shaft drives the second sleeve 2 to deviate from the original coupling's overall axis. The spring is kept in a slightly compressed state when initially installed, and the main transmission component, the wire rope, moves due to unbalanced force. During this process, the springs at both ends of each wire rope will be in a stretched and compressed state, which can reduce a part of the unbalanced force and ensure that even if the power input shaft is eccentric during the transmission process, it will not cause the eccentricity of the power input shaft, which can greatly reduce the vibration caused by the coupling's misalignment.

[0057] An embodiment of the present invention further provides a power transmission device, comprising a coupling provided by any technical solution of the present invention.

[0058] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coupling, characterized in that: include: A first shaft sleeve (1) having a first mounting hole (11) and a plurality of inner recesses (12), wherein the central axis of the first mounting hole (11) is along the central axis of the first shaft sleeve (1), and the plurality of inner recesses (12) surround the first mounting hole (11); A second sleeve (2) is installed in the first installation hole (11), and a first end of the second sleeve (2) is provided with a groove (21); A rope (3), wherein both ends of the rope (3) are located in the inner recess (12), and the middle of the rope (3) is inserted into the groove (21), so as to transmit torque between the first shaft sleeve (1) and the second shaft sleeve (2); an elastic member (4), at least partly located in the inner recess (12); as well as A limiting member (5) is provided at the end of the rope (3) located outside the inner recess (12), and the elastic member (4) is constructed to be located between the bottom wall of the inner recess (12) and the limiting member (5) in a compressed manner.

2. The coupling according to claim 1, characterized in that: The rope (3) comprises a first rope (31) and a second rope (32); the inner recessed portion (12) is provided with two pairs; and the groove (21) comprises a first groove (211) and a second groove (212) that intersect each other; Partial areas of the first rope (31) are respectively located in one of the pairs of inner recesses (12), and a middle portion of the first rope (31) is located in the first groove (211); Partial areas of the second rope (32) are respectively located in another pair of the inner recesses (12), and the middle of the second rope (32) is located in the second groove (212).

3. The coupling according to claim 2, characterized in that: Two of each pair of the inner recesses (12) are arranged at 180° on the first sleeve (1).

4. The coupling according to claim 2, characterized in that: The first groove (211) and the second groove (212) are perpendicular, and the depth of the first groove (211) is greater than the depth of the second groove (212).

5. The coupling according to claim 1, characterized in that: The inner recess (12) is configured to be formed by being recessed from the hole wall of the first mounting hole (11).

6. The coupling according to claim 1, characterized in that: The first sleeve (1) comprises: a first section of the shaft sleeve (13), wherein the first mounting hole (11) and the inner recess (12) are both arranged on the first section of the shaft sleeve (13); and The second section of the shaft sleeve (14) is provided with a second mounting hole (141) for mounting the first connecting shaft, and the second mounting hole (141) is communicated with the first mounting hole (11).

7. The coupling according to claim 6, characterized in that: The second shaft sleeve (2) comprises a third mounting hole (22) for mounting a second connecting shaft, and the third mounting hole (22) is coaxial or non-coaxial with the second mounting hole (141).

8. The coupling according to claim 1, characterized in that: The first shaft sleeve (1) is provided with a first locking hole (15) penetrating in the direction of its wall thickness; and / or the second shaft sleeve (2) is provided with a second locking hole (23) penetrating in the direction of its wall thickness.

9. A power transmission device, characterized in that: It comprises the coupling described in any one of claims 1 to 8.

Images