Arc-shaped double connecting rod coupling structure

Abstract

The utility model discloses a kind of arc double connecting rod shaft coupling structures, including shaft coupling cylinder, input end flange, output end flange, multiple groups of connecting components;The both ends of shaft coupling cylinder are respectively equipped with input end butt flange and output end butt flange;Input end flange and input end butt flange, and output end flange and output end butt flange are connected by corresponding multiple groups of connecting components;Connecting component includes stud pin, double connecting rod piece and knuckle bearing;By stud pin and double connecting rod piece cooperation, the connecting rod tension and compression force caused by torque is evenly shared by two connecting rods of double connecting rod piece, to effectively reduce the bending and shear load borne by one side of stud pin, improve torque bearing upper limit.Double connecting rod piece of arc structure can avoid interference collision with corresponding input end flange, output end flange, input end butt flange and output end butt flange.The stiffness of double connecting rod piece of arc structure is reduced, and the internal stress generated under over-constraint condition is smaller.

Description

Technical Field

[0001] This utility model relates to the technical field of transmission for multi-degree-of-freedom loading test benches of wind turbine generator sets, and in particular to an arc-shaped double-bar coupling structure. Background Technology

[0002] With the continuous increase in the single-unit power and load of wind turbine generators, the demand for multi-degree-of-freedom loading test benches is becoming increasingly urgent. Between the five-degree-of-freedom loader and the torque loading prime mover, the coupling not only needs to transmit enormous torque far exceeding conventional ranges, but also needs to achieve motion decoupling of the other five degrees of freedom. Existing technologies, such as the rod-end self-lubricating spherical bearing unidirectional flexible coupling disclosed in Chinese patent CN206129921U, while possessing significant distance compensation capabilities in the radial and axial directions and capable of multi-directional angle compensation, primarily transmit the main load through connecting rods and cantilever pins. Under high torque conditions, the cantilever pins will bear extremely large bending moments and shear stresses, leading to limitations in structural strength. Increasing the coupling's rotation diameter to reduce stress would significantly increase manufacturing difficulty and cost, making it difficult to meet the needs of practical engineering applications.

[0003] Therefore, how to effectively reduce the stress level of the pin within the limited size of the coupling, ensure that the connecting rods do not interfere with each other structurally, and maintain multi-directional compensation capability has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an arc-shaped double-link coupling structure, which can effectively reduce the stress level of the pin shaft. Furthermore, it can also ensure that the links do not interfere with each other and maintain multi-directional compensation capability.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: An arc-shaped double-bar coupling structure includes a coupling cylinder, an input flange, an output flange, and multiple sets of connecting components; The coupling cylinder is provided with an input end flange and an output end flange at both ends; The input flange and input mating flange, as well as the output flange and output mating flange, are all connected by corresponding sets of connection components; The connecting assembly includes a double-headed pin, a double connecting rod, and a spherical bearing. The double-headed pins are rotatably mounted on the input flange, output flange, input mating flange, and output mating flange respectively via corresponding spherical bearings, and both ends of the double-headed pins extend out of the corresponding input flange, output flange, input mating flange, and output mating flange. In the connecting assembly between the input flange and the input mating flange, one end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the input flange in the same group, and the other end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the input mating flange in the same group. In the connecting assembly between the output flange and the output mating flange, one end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the output flange in the same group, and the other end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the output mating flange in the same group.

[0006] In this technical solution, the tension and pressure of the connecting rod caused by torque are evenly distributed by the two connecting rods of the double-ended pin shaft through the cooperation of the double-ended pin shaft and the double-ended connecting rod, thereby effectively reducing the bending and shear load on one side of the double-ended pin shaft and increasing the upper limit of torque bearing capacity.

[0007] Furthermore, the double-link structure is arc-shaped. Compared to a straight-link structure, the arc-shaped double-link structure avoids interference and collision with the corresponding input flange, output flange, input mating flange, and output mating flange. In addition, the arc-shaped double-link structure has reduced stiffness, resulting in less internal stress under over-constraint conditions.

[0008] Furthermore, the spherical bearing includes an inner ring and an outer ring, wherein the ball head of the inner ring and the spherical inner hole of the outer ring cooperate with each other to form a spherical sliding pair; The middle part of the double-headed pin is connected to the inner ring, and the two ends of the double-headed pin are respectively connected to one end of the corresponding connecting rod in the corresponding double connecting rod.

[0009] In this technical solution, the double-headed pin can also swing or rotate accordingly by the swinging or rotating of the joint bearing. The connection between the arc-shaped double connecting rod and the swingable double-headed pin forms a ball joint structure that can swing and rotate at a certain angle, thereby constructing a spatial linkage mechanism to achieve compensation for axial and angular errors.

[0010] Furthermore, the input flange, output flange, input mating flange, and output mating flange are all provided with grooves that are evenly distributed around the circumference; The width of the groove in the input flange is greater than the width of the protrusion between adjacent grooves in the input flange. The width of the groove in the input flange is greater than the width of the protrusion between adjacent grooves in the input flange. The width of the groove in the output flange is greater than the width of the protrusion between adjacent grooves in the output flange. The width of the groove in the output flange is greater than the width of the protrusion between adjacent grooves in the output flange. In its initial state, the input flange is embedded into the input docking flange by the cooperation of its groove and the groove of the input docking flange; In its initial state, the output flange is embedded in the output mating flange with the cooperation of its groove and the groove of the output mating flange; The spherical bearing is mounted on the corresponding protrusion.

[0011] In this technical solution, the input flange is embedded in the input mating flange. In the initial state, the multiple sets of connecting components connected between the input flange and the input mating flange are all in the same plane of rotation. Since the width of the groove of the input flange is greater than the width of the protrusion between adjacent grooves in the input mating flange, and the width of the groove of the input mating flange is greater than the width of the protrusion between adjacent grooves in the input flange (i.e., providing sufficient space), interference and collision between the input flange and the input mating flange are avoided when they move relative to each other, and interference between the multiple sets of connecting components connected between the input flange and the input mating flange is also avoided.

[0012] Similarly, the output flange is embedded in the output mating flange. In the initial state, the multiple sets of connecting components connected between the output flange and the output mating flange are all in the same plane of rotation. Since the width of the groove of the output flange is greater than the width of the protrusion between adjacent grooves in the output mating flange, and the width of the groove of the output mating flange is greater than the width of the protrusion between adjacent grooves in the output flange (i.e., providing sufficient space), when the output flange and the output mating flange move relative to each other, interference and collision between the output flange and the output mating flange are avoided, and interference between the multiple sets of connecting components connected between the output flange and the output mating flange is also avoided.

[0013] Furthermore, the two connecting lines on the same plane between the two double-headed pins in the same set of connecting components and the central axis of the coupling cylinder have an included angle of 90 degrees in the initial state.

[0014] In this technical solution, the two connecting lines between the two double-headed pins in the same set of connecting components and the central axis of the coupling cylinder, located on the same plane, have an included angle of 90 degrees in the initial state. The structure features six pairs of double-headed pins and arc-shaped double connecting rods arranged in a spatially staggered manner, constructing a spatial linkage structure with five degrees of freedom except for the rotational direction. This structure enables composite displacement compensation in the axial, angular, and radial directions between the input flange and the input mating flange, and between the output flange and the output mating flange, improving the coupling's adaptability to centering errors.

[0015] Furthermore, the turning edges of the input flange, input mating flange, output flange, and output mating flange are chamfered to reduce stress concentration.

[0016] Furthermore, the coupling cylinder, the input end flange, and the output end flange are integrally formed to improve overall integrity.

[0017] Furthermore, the coupling body, input end flange, output end flange, and multiple sets of connecting components are all made of alloy steel, which can enhance the overall strength of the coupling.

[0018] Compared with existing technologies, the principles and advantages of this technical solution are as follows: 1. By using a double-headed pin and a double connecting rod, the tension and pressure of the connecting rod caused by torque are evenly distributed by the two connecting rods of the double connecting rod, thereby effectively reducing the bending and shear load on one side of the double-headed pin and increasing the upper limit of torque bearing capacity.

[0019] 2. The double-link structure is arc-shaped. Compared to a straight-link structure, the arc-shaped double-link structure avoids interference and collision with the corresponding input flange, output flange, input mating flange, and output mating flange. Furthermore, the arc-shaped double-link structure has reduced stiffness, resulting in less internal stress under over-constraint conditions.

[0020] 3. By swinging or rotating the spherical bearing, the double-headed pin can also swing or rotate accordingly. The connection between the arc-shaped double connecting rod and the swingable double-headed pin forms a ball joint structure that can swing and rotate at a certain angle, thereby constructing a spatial linkage mechanism to achieve compensation for axial and angular errors.

[0021] 4. The input flange is embedded in the input mating flange. In the initial state, the multiple sets of connecting components between the input flange and the input mating flange are all in the same plane of rotation. Since the width of the groove of the input flange is greater than the width of the protrusion between adjacent grooves in the input mating flange, and the width of the groove of the input mating flange is greater than the width of the protrusion between adjacent grooves in the input flange (i.e., providing sufficient space), interference and collision between the input flange and the input mating flange are avoided when they move relative to each other, and interference between the multiple sets of connecting components between the input flange and the input mating flange is also avoided. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the services required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of an arc-shaped double-bar coupling structure in its initial state according to an embodiment of the present invention; Figure 2 This is a side view of an arc-shaped double-bar coupling structure in its initial state according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the connection of double-headed pins to spherical bearings (mounted on corresponding flanges) and double connecting rods in an arc-shaped double-bar coupling structure according to an embodiment of the present invention. Figure 4 This is a perspective view of the input flange, output flange, input mating flange, and output mating flange in an arc-shaped double-bar coupling structure according to an embodiment of the present invention. Figure 5 This is one of the schematic diagrams illustrating the structure of an arc-shaped double-bar coupling for compensating for deviations according to an embodiment of this utility model; Figure 6 This is the second schematic diagram of an arc-shaped double-bar coupling structure for compensating for deviations according to an embodiment of this utility model (six sets of connecting components are omitted).

[0024] Figure label: 1-Coupling body; 2-Input flange; 3-Output flange; 4-Input mating flange; 5-Output mating flange; 6-Double-headed pin; 7-Double connecting rod; 8-Spherical bearing; 9-Groove; 10-Protrusion. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments: like Figures 1 to 5 As shown in the figure, the arc-shaped double-bar coupling structure described in this embodiment includes a coupling cylinder 1, an input flange 2, an output flange 3, and multiple sets of connecting components; The coupling cylinder 1 has an input end flange 4 and an output end flange 5 at its two ends respectively; the input end flange 2 and the input end flange 4, as well as the output end flange 3 and the output end flange 5 are connected by three sets of corresponding connecting components. Specifically, in this embodiment, the connecting assembly includes a double-headed pin 6, a double connecting rod 7, and a spherical bearing 8; The double-headed pin 6 is rotatably mounted on the input flange 2, output flange 3, input mating flange 4 and output mating flange 5 respectively through the corresponding spherical bearings 8, and both ends of the double-headed pin 6 extend out of the corresponding input flange 2, output flange 3, input mating flange 4 and output mating flange 5. In the connecting assembly between the input flange 2 and the input docking flange 4, one end of the double connecting rod 7 is connected to both ends of the double-headed pin 6 rotatably mounted on the input flange 2 in the same group, and the other end of the double connecting rod 7 is connected to both ends of the double-headed pin 6 rotatably mounted on the input docking flange 4 in the same group. In the connecting assembly between the output flange 3 and the output mating flange 5, one end of the double connecting rod 7 is connected to both ends of the double-headed pin 6 rotatably mounted on the output flange 3 in the same group, and the other end of the double connecting rod 7 is connected to both ends of the double-headed pin 6 rotatably mounted on the output mating flange 5 in the same group.

[0026] In this embodiment, the torque-induced tension and pressure of the connecting rod caused by the double-headed pin 6 and the double connecting rod 7 are evenly distributed by the two connecting rods of the double connecting rod 7, which can effectively reduce the bending and shear load on one side of the double-headed pin 6 and increase the upper limit of torque bearing capacity.

[0027] Specifically, in this embodiment, the double connecting rod 7 is an arc-shaped structure. Compared with a straight rod structure, the arc-shaped double connecting rod 7 can avoid interference and collision with the corresponding input flange 2, output flange 3, input mating flange 4, and output mating flange 5. In addition, the arc-shaped double connecting rod 7 has reduced stiffness, resulting in less internal stress under over-constraint conditions.

[0028] Specifically, in this embodiment, the input flange 2, output flange 3, input docking flange 4, and output docking flange 5 are all provided with grooves 9 evenly distributed in a circular pattern; the width of the groove 9 of the input flange 2 is greater than the width of the protrusion 10 between adjacent grooves 9 in the input docking flange 4; the width of the groove 9 of the input docking flange 4 is greater than the width of the protrusion 10 between adjacent grooves 9 in the input flange 2; the width of the groove 9 of the output flange 3 is greater than the width of the protrusion 10 between adjacent grooves 9 in the output docking flange 5; the width of the groove 9 of the output docking flange 5 is greater than the width of the protrusion 10 between adjacent grooves 9 in the output flange 3; in the initial state, the input flange 2 is embedded in the input docking flange 4 with the cooperation of its groove 9 and the groove 9 of the input docking flange 4; in the initial state, the output flange 3 is embedded in the output docking flange 5 with the cooperation of its groove 9 and the groove 9 of the output docking flange 5; the spherical bearing 8 is installed in the hole of the corresponding protrusion 10.

[0029] In this embodiment, the input flange 2 is embedded in the input mating flange 4. In the initial state, the multiple sets of connecting components connected between the input flange 2 and the input mating flange 4 are all in the same plane of rotation. Since the width of the groove 9 of the input flange 2 is greater than the width of the protrusion 10 between adjacent grooves 9 in the input mating flange 4, and the width of the groove 9 of the input mating flange 4 is greater than the width of the protrusion 10 between adjacent grooves 9 in the input flange 2 (i.e., providing sufficient space), when the input flange 2 and the input mating flange 4 move relative to each other, interference and collision between the input flange 2 and the input mating flange 4 are avoided, and interference between the multiple sets of connecting components connected between the input flange 2 and the input mating flange 4 is also avoided.

[0030] Similarly, the output flange 3 is embedded in the output mating flange 5. In the initial state, the multiple sets of connecting components connected between the output flange 3 and the output mating flange 5 are all in the same plane of rotation. Since the width of the groove 9 of the output flange 3 is greater than the width of the protrusion 10 between adjacent grooves 9 in the output mating flange 5, and the width of the groove 9 of the output mating flange 5 is greater than the width of the protrusion 10 between adjacent grooves 9 in the output flange 3 (i.e., providing sufficient space), when the output flange 3 and the output mating flange 5 move relative to each other, interference and collision between the output flange 3 and the output mating flange 5 are avoided, and interference between the multiple sets of connecting components connected between the output flange 3 and the output mating flange 5 is also avoided.

[0031] Specifically, in this embodiment, the spherical bearing 8 includes an inner ring and an outer ring. The outer ring is fixed to the inner wall of the corresponding hole of the protrusion 10. The ball head of the inner ring and the spherical inner hole of the outer ring cooperate with each other to form a spherical sliding pair. The middle part of the double-ended pin 6 is connected to the inner ring, and the two ends of the double-ended pin 6 are respectively connected to one end of the corresponding connecting rod in the corresponding double-link member 7. By swinging or rotating the spherical bearing 8, the double-ended pin 6 can also achieve corresponding swinging or rotation. The connection between the arc-shaped double-link member 7 and the swingable double-ended pin 6 forms a ball joint structure that can swing and rotate at a certain angle, thereby constructing a spatial linkage mechanism to achieve compensation for axial and angular errors.

[0032] Specifically, in this embodiment, the two connecting lines on the same plane between the two double-headed pins 6 in the same set of connecting components and the central axis of the coupling cylinder 1 have an included angle of 90 degrees in the initial state. The six pairs of double-headed pins 6 and the arc-shaped double connecting rods 7 are spatially staggered, constructing a spatial linkage structure with five degrees of freedom except for the rotational direction. This structure enables composite displacement compensation in the axial, angular, and radial directions between the input flange 2 and the input mating flange 4, and between the output flange 3 and the output mating flange 5, improving the coupling's adaptability to centering errors.

[0033] Specifically, in this embodiment, the turning edges of the input flange 2, the input mating flange 4, the output flange 3, and the output mating flange 5 are chamfered to reduce stress concentration.

[0034] Specifically, in this embodiment, the coupling cylinder 1, the input end flange 4, and the output end flange 5 are integrally formed to improve overall integrity.

[0035] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An arc-shaped double-bar coupling structure, characterized in that, Includes coupling housing, input flange, output flange, and multiple sets of connecting components; The coupling cylinder is provided with an input end flange and an output end flange at both ends; The input flange and input mating flange, as well as the output flange and output mating flange, are all connected by corresponding sets of connection components; The connecting assembly includes a double-headed pin, a double connecting rod, and a spherical bearing. The double-headed pins are rotatably mounted on the input flange, output flange, input mating flange, and output mating flange respectively via corresponding spherical bearings, and both ends of the double-headed pins extend out of the corresponding input flange, output flange, input mating flange, and output mating flange. In the connecting assembly between the input flange and the input mating flange, one end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the input flange in the same group, and the other end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the input mating flange in the same group. In the connecting assembly between the output flange and the output mating flange, one end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the output flange in the same group, and the other end of the double connecting rod is connected to both ends of the double-headed pin that is rotatably mounted on the output mating flange in the same group.

2. The arc-shaped double-bar coupling structure according to claim 1, characterized in that, The double connecting rod has an arc-shaped structure.

3. The arc-shaped double-bar coupling structure according to claim 2, characterized in that, The spherical bearing includes an inner ring and an outer ring, with the ball head of the inner ring and the spherical inner hole of the outer ring engaging with each other to form a spherical sliding pair; The middle part of the double-headed pin is connected to the inner ring, and the two ends of the double-headed pin are respectively connected to one end of the corresponding connecting rod in the corresponding double connecting rod.

4. The arc-shaped double-bar coupling structure according to claim 3, characterized in that, The input flange, output flange, input mating flange, and output mating flange are all provided with grooves that are evenly distributed around the circumference. The width of the groove in the input flange is greater than the width of the protrusion between adjacent grooves in the input flange. The width of the groove in the input flange is greater than the width of the protrusion between adjacent grooves in the input flange. The width of the groove in the output flange is greater than the width of the protrusion between adjacent grooves in the output flange. The width of the groove in the output flange is greater than the width of the protrusion between adjacent grooves in the output flange. In its initial state, the input flange is embedded into the input docking flange by the cooperation of its groove and the groove of the input docking flange; In its initial state, the output flange is embedded in the output mating flange with the cooperation of its groove and the groove of the output mating flange; The spherical bearing is mounted on the corresponding protrusion.

5. The arc-shaped double-bar coupling structure according to claim 4, characterized in that, The two lines connecting the two double-headed pins in the same set of connecting components and the central axis of the coupling cylinder, which are located on the same plane, have an included angle of 90 degrees in the initial state.

6. The arc-shaped double-bar coupling structure according to claim 2, characterized in that, The transition edges of the input flange, input mating flange, output flange, and output mating flange are chamfered.

7. The arc-shaped double-bar coupling structure according to claim 1, characterized in that, The coupling cylinder, the input end flange, and the output end flange are integrally formed.

8. The arc-shaped double-bar coupling structure according to claim 1, characterized in that, The coupling cylinder, input end flange, output end flange, and multiple sets of connecting components are all made of alloy steel.

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