Universal joint for a propeller shaft

Abstract

The application relates to the technical field of universal couplings, and provides a universal coupling for a transmission shaft, which comprises a main body assembly, a limiting assembly is connected to the middle of the outer side wall of the main body assembly, a clamping assembly is installed on one side of the outer side wall of the main body assembly and located at the limiting assembly, and a driving assembly is rotationally connected to the inside of the main body assembly. The device solves the problem that the universal coupling cannot feed back the overload or bending situation of the universal coupling during operation, if the universal coupling continues to operate, the universal coupling is easily completely damaged and cannot be used, the stretching and shrinking states of the limiting assembly are adjusted through cooperation of the clamping assembly and the inner expanding assembly, so that the connection and separation of the spline shaft and the spline sleeve are quickly completed, the axial limitation between the spline shaft and the spline sleeve disappears after the spline shaft and the spline sleeve are separated, the spline sleeve cannot continue to rotate along with the spline shaft, and the overload protection of the universal coupling can be realized at the moment.

Description

Technical Field

[0001] This invention relates to the field of universal coupling technology, and more specifically, to a universal coupling for a drive shaft. Background Technology

[0002] Universal couplings utilize the characteristics of their mechanism to enable continuous rotation of two shafts that are not on the same axis and have an included angle, and reliably transmit torque and motion. The biggest features of universal couplings are: their structure has a large angular compensation capability, compact structure, and high transmission efficiency.

[0003] Currently, while existing universal couplings can be assembled and connected in sections and drive two shafts that are not on the same axis to rotate synchronously, they cannot provide feedback on overload or bending situations during operation. If the coupling continues to operate, it can easily lead to complete damage and render the universal coupling unusable. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a universal coupling for drive shafts.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a universal coupling for a drive shaft, comprising a main body assembly, a limiting component connected to the middle of the outer side wall of the main body assembly, a clamping component installed on the outer side wall of the main body assembly and on one side of the limiting component, a driving component rotatably connected inside the main body assembly, one end of the driving component extending to the outside of the main body assembly, an inner expansion component installed inside the main body assembly, the inner expansion component respectively fitting against the clamping component and the inner expansion component, and universal connecting components connected to both ends of the main body assembly.

[0006] The present invention is further configured such that: the main component includes a spline shaft and a spline sleeve, the spline shaft and the spline sleeve are interlocked, the opposite ends of the spline shaft and the spline sleeve are each connected to a first connecting flange, a first sensing block is slidably connected to the outer side wall of the spline shaft, a second sensing block is installed on the outer side wall of the spline sleeve, and the first sensing block and the second sensing block are in contact with each other.

[0007] The present invention is further configured such that: both sets of universal joint components include a second connecting flange, the two second connecting flanges are respectively connected to the two first connecting flanges by bolts, the side of the second connecting flange away from the first connecting flange is connected to a first Y-shaped joint, and the first Y-shaped joint is hinged to the second Y-shaped joint by a cross joint.

[0008] The present invention is further configured such that: a connecting plate is connected to the side of the second Y-shaped connector away from the first Y-shaped connector, and limit blocks are uniformly connected to the side of the connecting plate away from the second Y-shaped connector.

[0009] The present invention is further configured such that: the limiting component includes a placement groove, the placement grooves are evenly arranged, and a plurality of the placement grooves are equidistantly opened on the outer side wall of the spline shaft, a limiting strip is inserted inside the placement groove, the inner side wall of the spline sleeve is evenly opened with limiting grooves, the plurality of limiting grooves are correspondingly arranged with the plurality of placement grooves, and one end of the limiting strip is inserted into the interior of the corresponding placement groove.

[0010] The present invention is further configured such that: two first inclined portions are symmetrically provided at the end of the limiting strip away from the spline shaft, and two second inclined portions are symmetrically provided on the inner wall of the placement groove, wherein the inclined surface of the second inclined portion is in contact with the inclined surface of the first inclined portion.

[0011] The invention is further configured such that: the clamping assembly includes a collar, the collar being sleeved on the outer wall of the spline shaft, and the collar being located on the side of the limiting strip away from the spline sleeve; brackets are uniformly installed on the outer wall of the collar, and multiple brackets are correspondingly arranged with multiple limiting strips; a clamping block is hinged inside the bracket, the clamping block is U-shaped, and one end of the clamping block is abutted against one end of the corresponding limiting strip; a insertion rod is provided at the end of the clamping block away from the collar, and the end of the insertion rod near the spline shaft extends into the interior of the spline shaft; a spring is sleeved on the outer wall of the insertion rod, and the two ends of the spring are respectively connected to the corresponding clamping block and the outer wall of the spline shaft.

[0012] The invention is further configured such that: the driving assembly includes a rotating shaft, one end of which is bearing-connected to the interior of a spline shaft, the axis of the rotating shaft being aligned with the axis of the spline shaft, a connecting plate is mounted on the outer side wall of the rotating shaft, grooves are uniformly formed on the outer side wall of the connecting plate, a third inclined portion is formed on the inner wall of the grooves, multiple grooves are correspondingly arranged with multiple limiting strips, one end of the insert rod extends into the interior of the corresponding groove, a through groove is formed on the outer side wall of the spline shaft, a handle is connected to the outer side wall of the rotating shaft, one end of the handle passes through the interior of the through groove, an arc-shaped guide rail is mounted on the outer side wall of the spline shaft, a slider is slidably connected inside the arc-shaped guide rail, one end of the slider is sleeved on the outer side wall of the handle and slidably connected to it.

[0013] The present invention is further configured such that: the inner expansion component includes an arc-shaped pressure plate and a pressure block, the arc-shaped pressure plate and the pressure block are evenly arranged, a plurality of arc-shaped pressure plates are equidistantly installed on the outer side wall of the rotating shaft, and the plurality of arc-shaped pressure plates are correspondingly arranged with a plurality of limiting strips, the plurality of pressure blocks are respectively hinged to the inner side wall of the spline shaft, the plurality of pressure blocks are correspondingly arranged with a plurality of arc-shaped pressure plates, and the end of the arc-shaped pressure plate away from the rotating shaft is in contact with the inner wall of the corresponding pressure block.

[0014] The advantages of this invention are:

[0015] (1) By setting a limiting component, a slot is placed to carry and guide the limiting strip. One end of the limiting strip forms an external protrusion on the outer side wall of the spline shaft, and the other end forms an internal protrusion inside the spline shaft. When the spline shaft and spline sleeve are spliced, the external protrusion slides into the corresponding limiting slot. At this time, the spline shaft and spline sleeve can achieve axial limiting and radial guiding functions. The extension and retraction state of the limiting component can be adjusted by the clamping component and the inner expansion component, thereby quickly completing the connection and separation of the spline shaft and spline sleeve. After separation, the insertion state is maintained to avoid the two from detaching and swinging.

[0016] (2) When the limiting component switches from the extended state to the retracted state, the height of the external protrusion of the limiting groove gradually decreases. At this time, the spline shaft drives the external protrusion to rotate continuously. The first inclined part on the limiting strip presses against the second inclined part on the inner wall of the limiting groove, and the first inclined part slides and presses against the second inclined part, causing the limiting strip to slide completely into the interior of the placement groove. The external protrusion disappears. At this time, the axial limit between the spline shaft and the spline sleeve disappears, and the spline sleeve cannot continue to rotate with the spline shaft. At this time, the overload protection of the universal coupling can be realized. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the front structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the connection structure between the main body component and the limiting component of the present invention;

[0020] Figure 4 This is a schematic diagram of the internal structure of the spline shaft of the present invention;

[0021] Figure 5 This is a schematic diagram of the clamping component structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the drive component structure of the present invention;

[0023] Figure 7 yes Figure 2 A sectional view cut along the AA direction;

[0024] Figure 8 yes Figure 3 A schematic diagram of the three-dimensional structure;

[0025] In the diagram: 1. Main body assembly; 11. First connecting flange; 12. Splined shaft; 13. Splined sleeve; 14. First sensing block; 15. Second sensing block; 2. Universal connection assembly; 21. Second connecting flange; 22. First Y-joint; 23. Second Y-joint; 24. Connecting plate; 25. Limiting block; 3. Limiting assembly; 31. Limiting strip; 32. Limiting groove; 33. First inclined part; 34. Second inclined part; 35. Placement groove; 4. Clamping assembly; 41. Collar; 42. Bracket; 43. Clamping block; 44. Insert rod; 45. Spring; 5. Internal expansion assembly; 51. Arc-shaped pressure plate; 52. Pressure block; 6. Drive assembly; 61. Rotating shaft; 62. Handle; 63. Connecting plate; 64. Groove; 65. Third inclined part; 66. Through groove; 67. Arc-shaped guide rail; 68. Slider. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0029] Please see Figure 1-8 The present invention provides the following technical solutions:

[0030] Example

[0031] A universal coupling for a drive shaft includes a main body assembly 1. A limiting component 3 is connected to the middle of the outer side wall of the main body assembly 1. The main body assembly 1 is divided into two parts, and the limiting component 3 is used to splice the two parts of the main body assembly 1. The length of the main body assembly 1 can be adjusted by the limiting component 3. A clamping component 4 is installed on the outer side wall of the main body assembly 1 and on one side of the limiting component 3. The clamping component 4 is used to adjust the state of the limiting component 3, that is, the limiting component 3 can switch from an extended state to a retracted state. A drive component 6 is rotatably connected inside the main body assembly 1. One end of the moving component 6 extends to the outside of the main body component 1. An inner expansion component 5 is installed inside the main body component 1. The inner expansion component 5 is in contact with the clamping component 4 and the inner expansion component 5 respectively. The inner expansion component 5 is used to adjust the state of the limiting component 3, that is, the limiting component 3 can switch from the contracted state to the extended state. The driving component 6 synchronously controls the operation of the inner expansion component 5 and the clamping component 4, thereby achieving the purpose of adjusting the limiting component 3. Both ends of the main body component 1 are connected to universal connection components 2. The universal connection components 2 are used for universal connection between the main body component 1 and the external shaft.

[0032] The main component 1 includes a splined shaft 12 and a splined sleeve 13, which are interlocked. A first connecting flange 11 is connected to the opposite ends of the splined shaft 12 and the splined sleeve 13. The splined shaft 12 can slide inside the splined sleeve 13, thereby adjusting the overall length of the main component 1. The first connecting flange 11 is used to connect the main component 1 to the universal joint component 2. A first sensing block 14 is slidably connected to the outer wall of the splined shaft 12, and a second sensing block 15 is installed on the outer wall of the splined sleeve 13. The first sensing block 14 and the second sensing block 15 are in contact with each other and cooperate to detect the axial force between the splined shaft 12 and the splined sleeve 13. If an overload occurs or the coupling bends, the rotation of the splined shaft 12 and the splined sleeve 13 will deviate, and their axes will shift. Consequently, the first sensing block 14 and the second sensing block 15 will become misaligned.

[0033] Both sets of universal joint assemblies 2 include a second connecting flange 21. The two second connecting flanges 21 are respectively connected to the two first connecting flanges 11 by bolts. A first Y-shaped connector 22 is connected to the side of the second connecting flange 21 away from the first connecting flange 11. The first Y-shaped connector 22 is hinged to a second Y-shaped connector 23 through a cross joint. The second connecting flange 21 is used to connect with the first connecting flange 11, so that the universal joint assembly 2 is connected to the main assembly 1. Since the first Y-shaped connector 22 is connected to the main assembly 1 through the second connecting flange 21, the axis of the second connecting flange 21 is consistent with the main assembly 1. The first Y-shaped connector 22 and the second Y-shaped connector 23 are hinged through a cross joint, so the second Y-shaped connector 23 can swing in multiple directions.

[0034] A connecting plate 24 is connected to the side of the second Y-shaped connector 23 away from the first Y-shaped connector 22, and limit blocks 25 are evenly connected to the side of the connecting plate 24 away from the second Y-shaped connector 23.

[0035] It should be noted that when the universal joint assembly 2 is connected to the external shaft, the connecting plate 24 and the limiting block 25 are installed on the external shaft simultaneously. The two connecting plates 24 fit together, and the limiting blocks 25 on the two connecting plates 24 are interlocked, so that the external shaft and the universal joint assembly 2 are limited in the axial direction. The two connecting plates 24 are then tightly connected by bolts.

[0036] The limiting component 3 includes placement grooves 35, which are evenly arranged and equidistantly opened on the outer side wall of the spline shaft 12. A limiting strip 31 is inserted inside the placement groove 35. A limiting groove 32 is evenly opened on the inner side wall of the spline sleeve 13. The multiple limiting grooves 32 are correspondingly arranged with the multiple placement grooves 35. One end of the limiting strip 31 is inserted into the corresponding placement groove 35. The placement groove 35 is used to support and guide the limiting strip 31. One end of the limiting strip 31 forms an external protrusion on the outer side wall of the spline shaft 12, and the other end forms an internal protrusion inside the spline shaft 12. When the spline shaft 12 and the spline sleeve 13 are spliced, the external protrusion slides into the corresponding limiting groove 32. At this time, the spline shaft 12 and the spline sleeve 13 can achieve axial limiting and radial guiding functions.

[0037] Two first inclined portions 33 are symmetrically provided at the end of the limiting strip 31 away from the spline shaft 12, and two second inclined portions 34 are symmetrically provided on the inner wall of the placement groove 35. The inclined surface of the second inclined portion 34 is in contact with the inclined surface of the first inclined portion 33. When the height of the external protrusion gradually decreases, the length of the external protrusion extending into the interior of the limiting groove 32 decreases. At this time, the spline shaft 12 drives the external protrusion to rotate continuously. The first inclined portion 33 on the limiting strip 31 presses against the second inclined portion 34 on the inner wall of the limiting groove 32, and the first inclined portion 33 slides and presses against the second inclined portion 34, causing the limiting strip 31 to slide completely into the interior of the placement groove 35. The external protrusion disappears. At this time, the axial limit between the spline shaft 12 and the spline sleeve 13 disappears, and the spline sleeve 13 cannot continue to rotate with the spline shaft 12. At this time, the overload protection of the universal coupling can be realized.

[0038] The clamping assembly 4 includes a collar 41, which is sleeved on the outer wall of the spline shaft 12 and located on the side of the limiting strip 31 away from the spline sleeve 13. When the spline shaft 12 and the spline sleeve 13 are inserted, the collar 41 is used to limit the insertion depth of the spline shaft 12. Supports 42 are evenly installed on the outer wall of the collar 41, with multiple supports 42 corresponding to multiple limiting strips 31. Clamping blocks 43 are hinged inside the supports 42. The clamping blocks 43 are U-shaped, and one side of the clamping block 43... The end of the clamping block 43 is attached to one end of the corresponding limiting strip 31. The end of the clamping block 43 away from the collar 41 is provided with a rod 44. The end of the rod 44 near the spline shaft 12 extends into the interior of the spline shaft 12. Since the clamping block 43 is U-shaped and hinged to the bracket 42, when the clamping block 43 presses against the limiting strip 31, the rod 44 will slide out from the interior of the spline shaft 12. When the clamping block 43 swings away from the limiting strip 31, the rod 44 will slide back into the interior of the spline shaft 12.

[0039] A spring 45 is fitted on the outer wall of the insertion rod 44. The two ends of the spring 45 are connected to the outer walls of the corresponding clamping block 43 and the spline shaft 12, respectively. The spring 45 supports the clamping block 43. Therefore, when the spring 45 is in a free state, the clamping block 43 is in a horizontal state. When the clamping block 43 swings in the direction of the limiting bar 31, the spring 45 is stretched. Conversely, the spring 45 is compressed.

[0040] The drive assembly 6 includes a rotating shaft 61, one end of which is connected to the inside of the spline shaft 12 by a bearing. The axis of the rotating shaft 61 is aligned with the axis of the spline shaft 12. A connecting plate 63 is installed on the outer side wall of the rotating shaft 61. Grooves 64 are evenly distributed on the outer side wall of the connecting plate 63. A third inclined portion 65 is provided on the inner wall of the groove 64. Multiple grooves 64 are correspondingly provided with multiple limit strips 31. One end of the insertion rod 44 extends into the corresponding groove 64. A handle 62 is connected to the outer side wall of the rotating shaft 61. Since the handle 62 is connected to the rotating shaft 61, when the handle 62 is turned, the rotating shaft 61 can be driven to rotate inside the spline shaft 12. The rotating shaft 61 drives the connecting plate 63 to rotate synchronously.

[0041] The groove 64 is divided into two parts: a horizontal part and a third inclined part 65. In the initial state, the end of the insertion rod 44 is located at the junction of the horizontal part and the third inclined part 65. When the connecting plate 63 starts to rotate, the insertion rod 44 slides inside the groove 64. When the third inclined part 65 presses on the end of the insertion rod 44, the insertion rod 44 slides out from the inside of the spline shaft 12. Conversely, when the insertion rod 44 slides in the horizontal part, the insertion rod 44 returns to the inside of the spline shaft 12.

[0042] A through groove 66 is provided on the outer wall of the spline shaft 12. One end of the handle 62 passes through the inside of the through groove 66. An arc-shaped guide rail 67 is installed on the outer wall of the spline shaft 12. A slider 68 is slidably connected inside the arc-shaped guide rail 67. One end of the slider 68 is sleeved on the outer wall of the handle 62 and is slidably connected to it. The through groove 66 is used to limit the sliding stroke of the handle 62, thereby achieving the purpose of controlling the rotation angle of the shaft 61. The arc-shaped guide rail 67 is used to drive the slider 68 to slide, causing the handle 62 to slide and swing inside the through groove 66. The arc-shaped guide rail 67 is electrically connected to the first sensing block 14 and the second sensing block 15. Once a misalignment occurs, the arc-shaped guide rail 67 will quickly start and adjust the swing angle of the handle 62.

[0043] The internal expansion assembly 5 includes an arc-shaped pressure plate 51 and a pressure block 52. The arc-shaped pressure plates 51 and the pressure blocks 52 are evenly arranged. Multiple arc-shaped pressure plates 51 are equidistantly installed on the outer side wall of the rotating shaft 61, and multiple arc-shaped pressure plates 51 are correspondingly arranged with multiple limiting strips 31. Multiple pressure blocks 52 are respectively hinged to the inner side wall of the spline shaft 12. Multiple pressure blocks 52 are correspondingly arranged with multiple arc-shaped pressure plates 51. The end of the arc-shaped pressure plate 51 away from the rotating shaft 61 is in contact with the inner wall of the corresponding pressure block 52.

[0044] It should be noted that when the rotating shaft 61 rotates, it drives the pressure block 52 to rotate synchronously, causing the pressure block 52 to slide on the inner wall of the corresponding arc-shaped pressure plate 51, thereby adjusting the swing angle of the arc-shaped pressure plate 51, causing the arc-shaped pressure plate 51 to squeeze or release the limiting strip 31, so that the length of the outer protrusion and the inner protrusion of the limiting strip 31 will change.

[0045] Specifically, the operator inserts the spline shaft 12 and the spline sleeve 13, ensuring that the spline shaft 12 is fully submerged inside the spline sleeve 13. When the spline shaft 12 and the spline sleeve 13 are joined, the external protrusion slides into the corresponding limiting groove 32. At this point, the spline shaft 12 and the spline sleeve 13 can achieve axial limiting and radial guiding functions. The collar 41 is used to limit the insertion depth of the spline shaft 12. Subsequently, the operator connects the two sets of universal joint assemblies 2 to the two external shafts respectively, as follows:

[0046] When the universal joint assembly 2 is connected to the external shaft, the connecting plate 24 and the limiting block 25 are installed on the external shaft simultaneously. The two connecting plates 24 fit together, and the limiting blocks 25 on the two connecting plates 24 are interlocked, so that the external shaft and the universal joint assembly 2 are limited in the axial direction. The two connecting plates 24 are then tightly connected by bolts.

[0047] After the universal joint assembly 2 is connected to the external shaft, the two sets of universal joint assemblies 2 are connected to the main body assembly 1. The connection process is as follows:

[0048] The second connecting flange 21 of a set of universal joint components 2 is bolted to one of the first connecting flanges 11 of the main body component 1. Then, the other set of universal joint components 2 is turned to an angle consistent with the axis of the main body component 1, and the spline shaft 12 is pulled out from the spline sleeve 13 to a suitable length as required. This set of universal joint components 2 is then connected to the main body component 1, so that the connection between the two sets of universal joint components 2 and the main body component 1 is completed. Since the first Y-shaped connector 22 is connected to the main body component 1 through the second connecting flange 21, and the axis of the second connecting flange 21 is consistent with the main body component 1, the first Y-shaped connector 22 and the second Y-shaped connector 23 are hinged through a cross joint. Therefore, the second Y-shaped connector 23 can swing in multiple directions.

[0049] At this time, the limiting component 3 is in a free state, the handle 62 is in the middle of the through groove 66, and the spring 45 supports the clamping block 43. When the spring 45 is in a free state, the clamping block 43 is in a horizontal state. After the universal coupling is connected to the external shaft, the arc guide rail 67 drives the slider 68 to move down, causing the handle 62 to slide inside the through groove 66 and swing downward. The handle 62 drives the rotating shaft 61 and the connecting plate 63 to rotate, causing the insertion rod 44 to slide in the horizontal position of the groove 64. At this time, the insertion rod 44 is not squeezed.

[0050] At the same time, the rotating shaft 61 drives the pressure block 52 to rotate inside the spline shaft 12. The pressure block 52 presses against the corresponding arc-shaped pressure plate 51. The arc-shaped pressure plate 51 swings on the inner wall of the spline shaft 12 and presses against the corresponding limiting strip 31, causing the limiting strip 31 to slide from the inside of the placement groove 35. The external protrusion of the limiting strip 31 increases, and the limiting strip 31 presses against the inside of the limiting groove 32, thereby ensuring the axial limiting stability of the spline shaft 12 and the spline sleeve 13.

[0051] Subsequently, an external shaft drives a set of universal joint components 2 to rotate. This driving force is transmitted sequentially to the main body component 1, another set of universal joint components 2, and another external shaft, causing the two external shafts to rotate synchronously through the universal coupling.

[0052] The first sensing block 14 and the second sensing block 15 cooperate to detect the axial force between the spline shaft 12 and the spline sleeve 13. If an overload or bending occurs, the spline shaft 12 and the spline sleeve 13 will deviate in rotation, and the first sensing block 14 and the second sensing block 15 will become misaligned.

[0053] At this time, the first sensing block 14 and the second sensing block 15 control the start of the arc-shaped guide rail 67. The arc-shaped guide rail 67 drives the slider 68 to move upward and causes the handle 62 to swing upward. The handle 62 drives the rotating shaft 61 to rotate in the opposite direction. At this time, the pressure block 52 moves synchronously and moves away from the hinge point of the arc-shaped pressure plate 51, causing the pressure block 52 to release the pressure on the limit strip 31, and the limit strip 31 is adjusted to a free state.

[0054] At the same time, the rotating shaft 61 drives the connecting plate 63 to rotate synchronously in the opposite direction, and the third inclined part 65 of the groove 64 moves towards the end position of the insertion rod 44. The insertion rod 44 is squeezed and slides out from the inside of the spline shaft 12. At this time, the clamping block 43 swings towards the position of the limiting strip 31, and the limiting strip 31 is pressed into the inside of the placement groove 35.

[0055] As the height of the outer protrusion of the limiting strip 31 gradually decreases, the length of the outer protrusion extending into the limiting groove 32 decreases. At this time, the spline shaft 12 drives the outer protrusion to rotate continuously. The first inclined part 33 on the limiting strip 31 presses against the second inclined part 34 on the inner wall of the limiting groove 32, and the first inclined part 33 slides and presses against the second inclined part 34, causing the limiting strip 31 to slide completely into the placement groove 35. The outer protrusion disappears, and the axial limit between the spline shaft 12 and the spline sleeve 13 disappears. The spline sleeve 13 cannot continue to rotate with the spline shaft 12. At this time, the overload protection of the universal coupling can be achieved.

[0056] After the protection is completed, the universal coupling can slide the limiting strip 31 out of the placement groove 35 and insert it into the limiting groove 32 through the above steps, so that the universal coupling can return to normal operation.

[0057] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A universal coupling for a drive shaft, comprising a main body assembly (1), characterized in that: A limiting component (3) is connected to the middle of the outer side wall of the main body component (1). A clamping component (4) is installed on the outer side wall of the main body component (1) and on one side of the limiting component (3). A driving component (6) is rotatably connected inside the main body component (1). One end of the driving component (6) extends to the outside of the main body component (1). An internal expansion component (5) is installed inside the main body component (1). Universal connection components (2) are connected to both ends of the main body component (1). The main component (1) includes a spline shaft (12) and a spline sleeve (13). The spline shaft (12) and the spline sleeve (13) are interlocked. The opposite ends of the spline shaft (12) and the spline sleeve (13) are connected to a first connecting flange (11). A first sensing block (14) is slidably connected to the outer side wall of the spline shaft (12). A second sensing block (15) is installed on the outer side wall of the spline sleeve (13). The first sensing block (14) and the second sensing block (15) are in contact with each other. Both sets of universal connection assemblies (2) include a second connection flange (21). The two second connection flanges (21) are connected to the two first connection flanges (11) respectively by bolts. A first Y-shaped connector (22) is connected to the side of the second connection flange (21) away from the first connection flange (11). The first Y-shaped connector (22) is hinged to the second Y-shaped connector (23) through a cross connector. The second Y-shaped connector (23) is connected to a connecting plate (24) on the side away from the first Y-shaped connector (22), and the connecting plate (24) is evenly connected to a limiting block (25) on the side away from the second Y-shaped connector (23). The limiting component (3) includes a placement groove (35), the placement grooves (35) are evenly arranged, and multiple placement grooves (35) are equidistantly opened on the outer side wall of the spline shaft (12). A limiting strip (31) is inserted inside the placement groove (35). A limiting groove (32) is evenly opened on the inner side wall of the spline sleeve (13). Multiple limiting grooves (32) are correspondingly arranged with multiple placement grooves (35). One end of the limiting strip (31) is inserted into the interior of the corresponding placement groove (35). The limiting bar (31) has two first inclined portions (33) symmetrically opened at one end away from the spline shaft (12), and the inner wall of the placement groove (35) has two second inclined portions (34) symmetrically opened, with the inclined surface of the second inclined portion (34) fitting with the inclined surface of the first inclined portion (33). The drive assembly (6) includes a rotating shaft (61), one end of which is connected to the inside of a splined shaft (12) by a bearing, and the axis of the rotating shaft (61) is aligned with the axis of the splined shaft (12). The internal expansion component (5) includes an arc-shaped pressure plate (51) and a pressure block (52). The arc-shaped pressure plate (51) and the pressure block (52) are evenly arranged. Multiple arc-shaped pressure plates (51) are equidistantly installed on the outer side wall of the rotating shaft (61). Multiple arc-shaped pressure plates (51) are correspondingly arranged with multiple limiting strips (31). Multiple pressure blocks (52) are respectively hinged to the inner side wall of the spline shaft (12). Multiple pressure blocks (52) are correspondingly arranged with multiple arc-shaped pressure plates (51). The end of the arc-shaped pressure plate (51) away from the rotating shaft (61) is in contact with the inner wall of the corresponding pressure block (52).

2. The universal coupling for a transmission shaft according to claim 1, characterized in that: The clamping assembly (4) includes a collar (41) which is sleeved on the outer wall of the spline shaft (12) and is located on the side of the limiting strip (31) away from the spline sleeve (13). Supports (42) are evenly installed on the outer wall of the collar (41), and multiple supports (42) are correspondingly arranged with multiple limiting strips (31). Clamping blocks (43) are hinged inside each support (42), and the clamping blocks (43) are U-shaped. The shape is such that one end of the clamping block (43) is in contact with one end of the corresponding limiting strip (31), and the end of the clamping block (43) away from the collar (41) is provided with a plug rod (44). The end of the plug rod (44) near the spline shaft (12) extends into the interior of the spline shaft (12). The outer wall of the plug rod (44) is fitted with a spring (45), and the two ends of the spring (45) are respectively connected to the outer wall of the corresponding clamping block (43) and the spline shaft (12).

3. A universal coupling for a transmission shaft according to claim 2, characterized in that: A connecting plate (63) is installed on the outer side wall of the rotating shaft (61). The outer side wall of the connecting plate (63) is evenly provided with grooves (64). The inner wall of the grooves (64) is provided with a third inclined part (65). Multiple grooves (64) are correspondingly provided with multiple limiting strips (31). One end of the insert rod (44) extends into the interior of the corresponding groove (64). A through groove (66) is provided on the outer side wall of the spline shaft (12). A handle (62) is connected to the outer side wall of the rotating shaft (61). One end of the handle (62) passes through the interior of the through groove (66). An arc-shaped guide rail (67) is installed on the outer side wall of the spline shaft (12). A slider (68) is slidably connected inside the arc-shaped guide rail (67). One end of the slider (68) is sleeved on the outer side wall of the handle (62) and slidably connected to each other.

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