A damping mechanism

Abstract

The application provides a damping mechanism which is connected with a first component and a second component in a mechanical device respectively, the second component has a connecting through hole, and the damping mechanism comprises a core shaft, an extrusion sleeve, an inner sleeve, an elastic body and a driving mechanism; the core shaft is arranged in the connecting through hole and connected with the first connecting component at one end; the extrusion sleeve is sleeved on the core shaft, the driving mechanism is connected with the extrusion sleeve, and the outer contour shape of the extrusion sleeve is a taper platform shape which is tapered towards the first component; the inner sleeve is sleeved on the extrusion sleeve, and the inner cavity shape of the inner sleeve is a taper platform shape which is tapered towards the first component; the elastic body is sleeved on the inner sleeve, and the outer wall is abutted against the inner wall of the connecting through hole. The damping mechanism can ensure that the damping component is uniformly stressed, and avoid that the fatigue performance of the damping component is reduced due to excessive local stress.

Description

Technical Field

[0001] This invention relates to the field of mechanical vibration reduction technology, and in particular to a vibration reduction mechanism. Background Technology

[0002] Wind energy is a clean and sustainable energy source. Compared to traditional energy sources, wind power generation does not rely on external energy sources. Wind power is gradually becoming an important part of the sustainable development strategies of many countries and is developing rapidly. With the trend of large-scale and offshore development in the international wind power market, megawatt-level high-power wind turbine generators will become mainstream. As the power of doubly-fed wind turbine generators continues to iterate and upgrade, the traditional four-point or three-point support drivetrain structures have obvious defects. When the gearbox weight is too large, the main bearing has difficulty supporting the excessive gearbox weight, which can easily cause misalignment of the drivetrain and lead to uneven load, ultimately shortening the drivetrain life. At the same time, both four-point and three-point support drivetrain structures require increasing the size of the gearbox torsion arm to safely transmit torque loads, resulting in excessively high manufacturing costs that are detrimental to market competitiveness.

[0003] Chinese patent CN201280012200.8 discloses "a bushing capable of pre-tightening by material extrusion and a support member equipped with the bushing." After the bushing is installed in the support member, it can achieve pre-tightening or expansion by extruding an elastomeric material inside the bushing. It can effectively decouple torque transmission between the gearbox and the main shaft, and its application model is similar to the commonly used three-point support model. Although this patent can achieve radial expansion force through axial loading, the rubber material directly bears the extrusion of the axially moving parts, resulting in uneven extrusion, large local stress and strain, and poor fatigue performance. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration damping mechanism that can ensure uniform stress on the vibration damping components and prevent the vibration damping components from having reduced fatigue performance due to excessive local stress.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A vibration damping mechanism is connected to a first component and a second component in a mechanical device, the second component having a connecting through hole. The vibration damping mechanism includes: a mandrel, a compression sleeve, an inner sleeve, an elastomer, and a drive mechanism.

[0007] The mandrel passes through the connecting through hole and one end is connected to the first connecting component;

[0008] The extrusion sleeve is sleeved on the mandrel, and the driving mechanism is connected to the extrusion sleeve to drive the extrusion sleeve to move along the axial direction of the mandrel on the mandrel. The outer contour shape of the extrusion sleeve is a frustoconical shape that tapers toward the first component.

[0009] The inner sleeve is fitted onto the extrusion sleeve, and its inner cavity is a truncated cone shape that tapers toward the first component. The inner sleeve includes at least two first cylinder tiles arranged sequentially along its circumference, with adjacent first cylinder tiles separated from each other.

[0010] The elastomer is a hollow cylindrical body and is sleeved on the inner sleeve, with its outer wall abutting against the inner wall of the connecting through hole. When the driving mechanism drives the extrusion sleeve to move toward the first connecting component, the extrusion sleeve can drive the first cylinder tile to apply radial extrusion force to the elastomer, causing the elastomer to deform radially.

[0011] Preferably, the cone angle of the outer profile of the extrusion sleeve is the same as the cone angle of the inner cavity of the inner sleeve.

[0012] Preferably, an outer sleeve is fitted onto the outer wall of the elastomer so that the elastomer abuts against the inner wall of the connecting through hole through the outer sleeve, and the outer sleeve is made of a rigid material.

[0013] Preferably, the elastomer is fixedly connected to the outer sleeve, and / or the axial length of the outer sleeve is the same as the axial length of the connecting through hole.

[0014] Preferably, the elastomer includes N buffer segments arranged sequentially along the circumference of the elastomer. When the elastomer is in a free state, two adjacent buffer segments are separated from each other, where N is an integer greater than 1.

[0015] The outer sleeve includes N second cylindrical tiles, which are arranged sequentially along the circumference of the elastic body, and each of the N second cylindrical tiles is connected to one of the N buffer sections.

[0016] Preferably, the buffer segment has an abutting end face facing the adjacent buffer segment, and when the elastomer is subjected to radial pressure, the buffer segment can deform so that the two abutting end faces of the two adjacent buffer segments fit together.

[0017] A vibration damping groove is provided on the abutting surface. When the two abutting end faces of two adjacent buffer sections are put together, the two vibration damping grooves located on these two abutting end faces together form a vibration damping space.

[0018] Preferably, an annular protrusion extending axially along the mandrel is provided on the surface of the mandrel, and the end of the inner sleeve near the first component abuts against the annular protrusion.

[0019] Preferably, a release screw hole with an axis parallel to the axis of the extrusion sleeve is provided in the side wall of the extrusion sleeve, so that the external stud can be threaded into the release screw hole and abut against the inner wall of the inner sleeve by the screwing movement in the screw hole.

[0020] Preferably, the drive mechanism includes: a compression ring and a clamping screw;

[0021] The first component is provided with a clamping screw hole that matches the clamping screw, and the mandrel has a receiving through hole extending along its axial direction. On a projection perpendicular to the axis of the receiving through hole, the clamping screw hole is located within the receiving through hole.

[0022] The compression ring is sleeved on the mandrel and can abut against the end face of the compression sleeve away from the first component. The clamping screw passes through the receiving through hole and is threaded into the clamping screw hole. When the clamping screw is screwed into the clamping screw hole, the screw head of the clamping screw can abut against the end face of the compression ring opposite to the compression sleeve, so as to drive the compression sleeve to move from a first position away from the first component to a second position closer to the first component through the compression ring.

[0023] Preferably, the end of the mandrel connected to the first component is a connecting end, and a positioning groove with a shape matching the connecting end is provided on the surface of the first component. The connecting end is located within the positioning groove, and the clamping screw hole is provided on the bottom wall of the positioning groove.

[0024] Preferably, it also includes a limiting component;

[0025] A limiting groove is provided on the surface of the mandrel. When the extrusion sleeve is in the second position, the limiting component is engaged in the limiting groove and abuts against the end face of the extrusion sleeve opposite to the first component.

[0026] Preferably, the limiting groove is an annular ring extending circumferentially along the mandrel, and the limiting component is a snap ring.

[0027] The vibration damping mechanism of the present invention employs an elastomer fitted onto the inner sleeve, with its outer wall abutting against the inner wall of the connecting through hole. When the driving mechanism drives the extrusion sleeve to move toward the first connecting component, the extrusion sleeve can drive the first cylinder tile to apply radial extrusion force to the elastomer, causing the elastomer to deform radially. This technical solution ensures that the vibration damping component is subjected to uniform force and avoids the vibration damping component from having reduced fatigue performance due to excessive local stress. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of the vibration reduction structure of the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the cross-section of the inner sleeve when it does not bear the extrusion sleeve extrusion force;

[0030] Figure 3 for Figure 1 A schematic diagram of the cross-section of the inner sleeve under the extrusion sleeve extrusion force;

[0031] Figure 4 for Figure 1 A cross-sectional schematic diagram showing the connection state of the inner sleeve, elastomer, and outer sleeve;

[0032] Figure 5 for Figure 1 Enlarged schematic diagram of part A in the diagram.

[0033] In the diagram: 1-First component; 2-Second component; 3-Connecting through hole; 4-Mandrel; 5-Extrusion sleeve; 6-Inner sleeve; 7-Elastomer; 8-Drive mechanism; 9-First barrel bearing; 10-Outer sleeve; 11-Buffer section; 12-Second barrel bearing; 13-Vibration damping groove; 14-Annular protrusion; 15-Removal screw hole; 16-Extrusion ring; 17-Clamping screw; 18-Clamping screw hole; 19-Accommodation through hole; 20-Connecting section; 21-Positioning groove; 22-Limiting component; 23-Limiting groove. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the vibration damping mechanism of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0035] Example 1

[0036] like Figure 1As shown, a vibration damping mechanism is connected to a first component 1 and a second component 2 in a mechanical device. The second component 2 has a connecting through hole 3. The vibration damping mechanism includes: a mandrel 4, a compression sleeve 5, an inner sleeve 6, an elastic body 7, and a drive mechanism 8. The mandrel 4 passes through the connecting through hole 3, and one end is connected to a first connecting component. The compression sleeve 5 is sleeved on the mandrel 4. The drive mechanism 8 is connected to the compression sleeve 5 and drives the compression sleeve 5 to move axially along the mandrel 4. The outer contour of the compression sleeve 5 is a frustoconical shape that tapers towards the first component 1. The inner sleeve 6 (which can be made of a rigid material) is sleeved on the compression sleeve 5, and its inner cavity shape is a frustoconical shape that tapers towards the first component 1. Figure 2 , 3 As shown in Figure 4, the inner sleeve 6 includes at least two first cylindrical tiles 9 arranged sequentially along its circumference, with adjacent first cylindrical tiles 9 separated from each other. The elastic body 7 (made of rubber) is a hollow cylindrical body fitted onto the inner sleeve 6, with its outer wall abutting against the inner wall of the connecting through hole 3. When the driving mechanism 8 drives the extrusion sleeve 5 to move towards the first connecting component, the extrusion sleeve 5 can drive the first cylindrical tiles 9 to apply radial extrusion force to the elastic body 7, causing the elastic body 7 to deform radially. Specifically, the cone angle of the outer contour of the extrusion sleeve 5 is the same as the cone angle of the inner cavity of the inner sleeve 6.

[0037] When the drive mechanism 8 drives the extrusion sleeve 5 to move toward the first component 1, the extrusion sleeve 5 can apply a radial force to the inner wall of the inner sleeve 6, so that the inner sleeve 6... Figure 2 The state shown is transformed into Figure 3 As shown, this allows radial forces to be applied to the inner wall of the elastomer 7 through at least two first barrel tiles 9, and the force borne by the elastomer 7 in the circumferential direction is uniform, preventing the vibration damping component from having reduced fatigue performance due to excessive local stress. It should be noted that in actual manufacturing, the elastomer 7 can be fixedly connected to the outer wall of the inner sleeve 6 by means of bonding or vulcanization.

[0038] Example 2

[0039] Based on Example 1, such as Figure 1 , 4As shown, an outer sleeve 10 is fitted onto the outer wall of the elastomer 7 so that the elastomer 7 abuts against the inner wall of the connecting through hole 3 through the outer sleeve 10. The outer sleeve 10 is made of a rigid material. This technical solution solves the problem of excessive friction caused by direct contact between the elastomer 7 and the inner wall of the connecting through hole 3, which makes it difficult to install the elastomer 7 into the connecting through hole 3. Specifically, the elastomer 7 and the outer sleeve 10 are fixedly connected, and the two can be fixed together by bonding or vulcanization. In specific manufacturing, the axial length of the outer sleeve 10 can be the same as the axial length of the connecting through hole 3. This allows the relative position of the elastomer 7 in the connecting through hole 3 to be determined based on the positional correspondence between the end face of the outer sleeve 10 and the end side of the connecting through hole 3, thereby ensuring the accuracy of the installation position of the elastomer 7 in the connecting through hole 3.

[0040] Example 3

[0041] Based on Embodiment 2, such as Figure 4 As shown, the elastic body 7 includes N buffer segments 11 arranged sequentially along the circumference of the elastic body 7. When the elastic body 7 is in a free state, adjacent buffer segments 11 are separated from each other, where N is an integer greater than 1. The outer sleeve 10 includes N second cylindrical tiles 12 arranged sequentially along the circumference of the elastic body 7, and the N second cylindrical tiles 12 are connected one-to-one with the N buffer segments 11.

[0042] Furthermore, such as Figure 4 As shown, the buffer segment 11 has abutting end faces (not shown) facing adjacent buffer segments 11. When the elastomer 7 is subjected to radial pressure, the buffer segment 11 can deform to make the two abutting end faces of two adjacent buffer segments 11 fit together. A damping groove 13 is provided on the abutting surface. When the two abutting end faces of two adjacent buffer segments 11 fit together, the two damping grooves 13 on these two abutting end faces together form a damping space (not shown). In actual manufacturing, the N buffer segments 11 have identical shapes and specifications. Thus, when the N buffer segments 11 are subjected to radial pressure, they can form N damping spaces, and these N damping spaces are uniformly positioned along the circumference of the elastomer 7. This not only improves the flexibility of the elastomer 7, meaning it makes the elastomer 7 more prone to deformation and avoids tearing under radial pressure, but also ensures that the elastomer 7 maintains uniform softness in the circumferential direction.

[0043] Example 4

[0044] Based on Example 1, such as Figure 1As shown, an annular protrusion 14 extending axially along the mandrel 4 is provided on the surface of the mandrel 4, and the end of the inner sleeve 6 near the first component 1 abuts against the annular protrusion 14. This technical solution can prevent the inner sleeve 6 from displacing axially along the mandrel 4 under the drive of the extrusion sleeve 5.

[0045] Specifically, such as Figure 1 As shown, the drive mechanism 8 includes a compression ring 16 and a clamping screw 17. A clamping screw hole 18 matching the clamping screw 17 is provided on the first component 1. The mandrel 4 has a receiving through hole 19 extending axially therein. The clamping screw hole 18 is located within the receiving through hole 19 in a projection perpendicular to its axis. The compression ring 16 is sleeved on the mandrel 4 and abuts against the end face of the compression sleeve 5 away from the first component 1. The clamping screw 17 passes through the receiving through hole 19 and is threaded into the clamping screw hole 18. When the clamping screw 17 is screwed into the clamping screw hole 18, the screw head of the clamping screw 17 abuts against the end face of the compression ring 16 opposite to the compression sleeve 5, thereby driving the compression sleeve 5 from a first position away from the first component 1 to a second position closer to the first component 1 via the compression ring 16.

[0046] In actual production, it can be like this Figure 1 As shown, the end of the mandrel 4 that connects to the first component 1 is the connecting end 20. A positioning groove 21 with a shape matching the connecting end 20 is provided on the surface of the first component 1. The connecting end 20 is located inside the positioning groove 21, and the clamping screw hole 18 is provided on the bottom wall of the positioning groove 21. This ensures a reliable and stable connection between the mandrel 4 and the first component 1.

[0047] As one possible implementation method, such as Figure 5 As shown, it also includes a limiting component 22. A limiting groove 23 is provided on the surface of the mandrel 4. When the extrusion sleeve 5 is in the second position, the limiting component 22 is engaged within the limiting groove 23 and abuts against the end face of the extrusion sleeve 5 facing away from the first component 1. In this way, when the clamping screw 17 is unscrewed from the clamping screw hole 18, that is, when the clamping screw 17 is no longer pressing against the extrusion sleeve 5 through the extrusion ring 16, the limiting component 22 can fix the extrusion sleeve 5 in the second position to maintain the radial extrusion force on the inner sleeve 6. Specifically, the limiting groove 23 is an annular ring extending circumferentially along the mandrel 4, and the limiting component 22 is a retaining spring.

[0048] Example 5

[0049] Based on Embodiment 1, a release screw hole 15 with its axis parallel to the axis of the extrusion sleeve 5 is provided in the side wall of the extrusion sleeve 5, so that the external stud can be threaded into the release screw hole 15 and abut against the inner wall of the inner sleeve 6 by the screwing motion in the screw hole. In this way, the extrusion sleeve 5 can be disassembled from the inner cavity of the inner sleeve 6 by the screwing action of the external stud in the release screw hole 15, which facilitates the disassembly work.

[0050] Example 6

[0051] To achieve the objective of the invention, the present invention also provides a gearbox, including the vibration damping mechanism in any of the above embodiments. (Refer to...) Figure 1 The first component 1 is the gearbox body, and the second component 2 is the flange connected to the gearbox body.

[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A damping mechanism, which is connected with a first component (1) and a second component (2) in a mechanical device respectively, and the second component (2) has a connecting through hole (3), characterized in that: comprising: a mandrel (4), an extrusion sleeve (5), an inner sleeve (6), an elastic body (7) and a driving mechanism (8); the mandrel (4) is arranged in the connecting through hole (3), and one end is connected with the first component; the extrusion sleeve (5) is arranged on the mandrel (4), the driving mechanism (8) is connected with the extrusion sleeve (5) to drive the extrusion sleeve (5) to move along the axial direction of the mandrel (4), and the outer shape of the extrusion sleeve (5) is a frustum taper which is tapered towards the first component (1); the inner sleeve (6) is arranged on the extrusion sleeve (5), and the inner cavity shape is a frustum taper which is tapered towards the first component (1), and the inner sleeve (6) comprises at least two first cylinder tiles (9) arranged along the circumference direction, and the adjacent two first cylinder tiles (9) are separated from each other; the elastic body (7) is a hollow cylindrical body arranged on the inner sleeve (6), and the outer wall abuts against the inner wall of the connecting through hole (3), when the driving mechanism (8) drives the extrusion sleeve (5) to move towards the first component, the extrusion sleeve (5) can drive the first cylinder tile (9) to apply radial extrusion force to the elastic body (7), so that the elastic body (7) is deformed along the radial direction; an outer sleeve (10) is arranged on the outer wall of the elastic body (7), so that the elastic body (7) abuts against the inner wall of the connecting through hole (3) through the outer sleeve (10), and the outer sleeve (10) is made of a steel material; the elastic body (7) comprises N buffer segments (11), and the N buffer segments (11) are arranged along the circumference direction of the elastic body (7), and when the elastic body (7) is in a free state, the adjacent two buffer segments (11) are separated from each other, wherein N is an integer greater than 1; the outer sleeve (10) comprises N second cylinder tiles (12), and the N second cylinder tiles (12) are arranged along the circumference direction of the elastic body (7), and the N second cylinder tiles (12) are connected with the N buffer segments (11) one by one; the buffer segment (11) has an abutting end face facing the adjacent buffer segment (11), and when the elastic body (7) bears radial pressure, the buffer segment (11) can be deformed, so that the two abutting end faces of the adjacent two buffer segments (11) are attached together; a damping groove (13) is arranged on the abutting end face, and when the two abutting end faces of the adjacent two buffer segments (11) are attached together, the two damping grooves (13) on the two abutting end faces form a damping space together. The taper angle of the outer contour of the extrusion sleeve (5) is the same as the taper angle of the inner cavity of the inner sleeve (6). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The damping mechanism of claim 1, wherein: ​ 3. The damping mechanism of claim 2, wherein: The elastic body (7) is fixedly connected with the outer sleeve (10), and / or the axial length of the outer sleeve (10) is the same as the axial length of the connecting through hole (3).

4. The damping mechanism according to any one of claims 1 to 3, characterized in that: An annular protrusion (14) extending axially along the mandrel (4) is arranged on the surface of the mandrel (4), and the inner sleeve (6) is abutted against the annular protrusion (14) at one end close to the first component (1).

5. The damping mechanism according to any one of claims 1 to 3, characterized in that: A threaded hole (15) parallel to the axis of the extrusion sleeve (5) is arranged in the sidewall of the extrusion sleeve (5), so that an external threaded stud can be threadedly connected in the threaded hole (15) and abutted against the inner wall of the inner sleeve (6) through a screwing motion in the threaded hole.

6. The damping mechanism according to any one of claims 1 to 3, characterized in that: The driving mechanism (8) comprises an extrusion ring (16) and a compression screw (17), a compression threaded hole (18) matched with the compression screw (17) is arranged on the first component (1), and the mandrel (4) has an accommodating through hole (19) extending axially along the mandrel (4), and in a projection perpendicular to the axis of the accommodating through hole (19), the compression threaded hole (18) is located in the accommodating through hole (19). The extrusion ring (16) is sleeved on the mandrel (4) and can abut against the end face of the extrusion sleeve (5) away from the first component (1), the compression screw (17) passes through the accommodating through hole (19) and is threadedly connected in the compression threaded hole (18), and when the compression screw (17) is screwed into the compression threaded hole (18), the screw head of the compression screw (17) can abut against the end face of the extrusion ring (16) away from the extrusion sleeve (5) to drive the extrusion sleeve (5) to move from a first position away from the first component (1) to a second position close to the first component (1) through the extrusion ring (16).

7. The damping mechanism of claim 6, wherein: The end of the mandrel (4) connected with the first component (1) is a connecting end (20), a positioning groove (21) matched with the connecting end (20) in shape is arranged on the surface of the first component (1), and the connecting end (20) is located in the positioning groove (21), and the compression threaded hole (18) is arranged on the bottom wall of the positioning groove (21).

8. The damping mechanism of claim 6, wherein: A limiting component (22) is further included, a limiting groove (23) is arranged on the surface of the mandrel (4), and when the extrusion sleeve (5) is located at the second position, the limiting component (22) is clamped in the limiting groove (23) and abuts against the end face of the extrusion sleeve (5) away from the first component (1).

9. The damping mechanism of claim 8, wherein: The limiting groove (23) is a circular ring extending circumferentially along the mandrel (4), and the limiting component (22) is a circlip.

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