An inertance element with variable output limit

Abstract

The present invention discloses an inertor with variable output limit. It includes a housing, a mass block, a friction sleeve, a first friction plate, a second friction plate, ball bearings, a first ball nut, a lead screw, a turntable, a first axially movable disk, a second axially movable disk, a partition plate, a spring, a thrust bearing, a second ball nut, a bushing, a connecting ear, etc. Starting from the perspective of the principle of inertance and vibration isolation, the present invention realizes inertance by using components such as a ball screw and a mass block, and friction plates are arranged between the mass block, the ball nut and the turntable, so that the output of the inertor is limited, and the limit value can change with the absolute value of the displacement, while the dynamic characteristics of the inertor are retained within a certain range.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration control devices, and particularly to an inertor with variable output force limit. Background Art

[0002] In recent years, inertors are commonly used in the fields of seismic isolation and vibration control of building structures and mechanical structures. They are mainly used to increase the apparent mass of the structure and reduce the relative displacement between the structure and the excitation source. At the same time, inertors can also be used together with other damping devices to improve the effect of the vibration (seismic) control system. However, due to the sensitivity of inertors to high-frequency excitation, they are prone to excessive output force under high-frequency excitation, especially under random excitations such as earthquakes. This characteristic causes a sharp increase in the control force of the inertor under high-frequency excitation, which may lead to excessive stress on itself or the supporting structure connected to it and cause damage. Therefore, it is necessary to limit the output force of the inertor to prevent excessive control force under high-frequency excitation and protect the inertor and the controlled structure. In addition, a single output force limit may affect the effect of the inertor under extreme seismic actions. Therefore, the output force limit of the inertor should have a certain adaptive ability. Summary of the Invention

[0003] To solve the above problems, the present invention provides an inertor with variable output force limit, including a housing, a mass block, a friction sleeve, a first friction plate, a second friction plate, a ball, a first ball nut, a lead screw, a turntable, a first axially movable plate, a second axially movable plate, a partition plate, a spring, a thrust bearing, a second ball nut, a bushing, etc.; when the lead screw moves linearly with the external structure, the ball drives the ball nut and the mass block to rotate, thereby realizing inertia.

[0004] A first friction plate is arranged inside the mass block, a friction sleeve is fixedly arranged on the ball nut, and a second friction plate is arranged between the mass block and the turntable. A pre-tightening force is applied between the first friction plate and the friction sleeve through bolts, so that a large initial frictional force can be realized between the first friction plate and the friction sleeve, and the mass block can rotate synchronously with the ball nut. When the inertial force of the mass block is greater than the total frictional force provided by the first and second friction plates, the friction plates can decouple the movement of the ball nut and the mass block, thereby limiting the output force of the inertor.

[0005] The turntable is connected to the first axially movable plate through a thrust bearing, and a spring is arranged between the first axially movable plate and the second axially movable plate. When the lead screw moves horizontally, it drives the second axially movable plate, compresses the spring, increases the pressure of the second friction plate between the turntable and the mass block, and increases the frictional force provided by the second friction plate. And the frictional force increases with the increase of the absolute value of the displacement of the lead screw, thereby realizing the variable characteristic of the output force limit of the inertor.

[0006] To achieve the above object, the present invention is implemented by the following technical solutions:

[0007] An embodiment of the present application provides an inertor with variable output limit value, including an inertor with variable output limit value, which is characterized by including a housing, a mass block, a friction sleeve, a first friction plate, a second friction plate, a ball, a first ball nut, a lead screw, a turntable, a first axially movable plate, a second axially movable plate, a partition plate, a spring, a thrust bearing, a second ball nut, a bushing, a connecting ear, and a bolt, wherein:

[0008] The lead screw has a thread, and the ball is embedded between the ball nut and the thread of the lead screw to form a ball screw; the mass block is arranged outside the first ball nut and axially surrounds the first ball nut, the first friction plate is fixedly arranged inside the mass block, and the friction sleeve is fixedly sleeved on the first ball nut.

[0009] The turntable is arranged on both sides of the mass block and is connected to the first ball nut by a spline, and the second friction plate is fixedly arranged between the turntable and the mass block; the first axially movable plate is arranged outside the turntable and is coaxial with the turntable, the second axially movable plate is connected to the housing, and the spring is arranged between the second axially movable plate and the first axially movable plate;

[0010] The lead screw is fixedly installed with the bushing, the bushing can push the second axially movable plate to perform translational motion, the housing is fixedly connected to an external structure through the connecting ear, the lead screw is connected to another external structure through the connecting ear, and the lead screw only performs translational motion relative to the housing.

[0011] Further, the partition plate is connected to the first axially movable plate by a spline; a thrust bearing is arranged between the partition plate and the first ball nut, and a second ball nut is arranged between the partition plate and the lead screw.

[0012] Further, a thrust bearing is arranged between the turntable and the first axially movable plate, and the first axially movable plate is connected to the housing by a spline.

[0013] Further, the second axially movable plate is connected to the housing by a spline.

[0014] Further, the bolt is used to apply a pre-tightening force between the first friction plate and the friction sleeve.

[0015] Further, the housing, the mass block and the first ball nut are hollow cylinders.

[0016] Further, there are at least two mass blocks, which are connected by the bolt.

[0017] Further, when the lead screw makes a translational motion along with the other external structure, the first ball nut is driven to rotate by the ball, so that the mass block rotates, thereby realizing an inertance.

[0018] Further, when the lead screw makes a translational motion, the bushing pushes the corresponding second axially movable disc, so that the corresponding spring is compressed, thereby applying a pressure to the second friction plate, and increasing the frictional force of the second friction plate.

[0019] Further, when the inertial force of the mass block is greater than the total frictional force provided by the first friction plate and the second friction plate, the motion of the mass block is decoupled from that of the first ball nut and the turntable, thereby limiting the output force of the inertor, and the frictional force provided by the second friction plate increases with the increase of the absolute value of the displacement of the lead screw, thereby realizing the variable characteristic of the output force limit of the inertor.

[0020] The inertor with variable output force limit provided by the present invention has the following beneficial effects:

[0021] The inertor with variable output force limit provided by the present invention has a compact structure and a simple configuration, and can be used in a limited space; at the same time, the inertor with variable output force limit provided by the present invention can achieve good inertance characteristics within the required stroke range; in addition, the inertor with variable output force limit provided by the present invention can realize that the limit of the maximum output force is variable with displacement, and can adaptively protect the inertor and the controlled structure. Description of the Drawings

[0022] Figure 1 It is a schematic cross-sectional view of an inertor with variable output force limit provided by an embodiment of the present application;

[0023] Figure 2 It is a partial cross-sectional view of an inertor with variable output force limit provided by an embodiment of the present application;

[0024] Figure 3 It is a partial axonometric projection view of an inertor with variable output force limit provided by an embodiment of the present application;

[0025] Figure 4 It is another partial axonometric projection view of an inertor with variable output force limit provided by an embodiment of the present application;

[0026] Figure 5 It is a semi-cross-sectional axonometric projection view of an inertor with variable output force limit provided by an embodiment of the present application; Detailed Embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure. Based on the solutions provided by the present disclosure, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present disclosure.

[0028] In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure.

[0029] Unless otherwise required by the context, throughout the specification and claims, the term "comprising" is to be interpreted in an open, inclusive sense, i.e., "including, but not limited to". For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0030] When describing some embodiments, expressions such as "connected" and "coupled" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical contact with each other. However, the term "connected" may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0031] In the content of the present disclosure, the meanings of "on", "above", and "over" should be interpreted in the broadest sense, such that "on..." not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also includes the meaning of "above" or "over" something without intermediate features or layers therebetween (i.e., directly on something).

[0032] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views and / or projection views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions is exaggerated for clarity. Thus, variations in the shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Accordingly, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations resulting from, for example, manufacturing. Thus, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shape of the regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0033] Regarding the above-mentioned traditional inertors, they often produce excessive output under high-frequency excitation. The present invention provides a compact and simple-structured inerter with variable output limit, which can be used in a limited space; at the same time, the inerter with variable output limit provided by the present invention can achieve good inerter characteristics within the required stroke range; in addition, the inerter with variable output limit provided by the present invention can limit the maximum output to protect the inerter and the controlled structure. The following will be specifically described with reference to the drawings.

[0034] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic cross-sectional view of an inerter with variable output limit provided by an embodiment of the present application, Figure 2 and is a partial cross-sectional view of an inerter with variable output limit provided by an embodiment of the present application. As shown in Figure 1 and Figure 2 , the inerter with variable output limit includes a housing 1, a mass block 2, a friction sleeve 18, a first friction plate 3, a second friction plate 4, a ball 5, a first ball nut 6, a lead screw 7, a turntable 8, a first axially movable disk 9, a second axially movable disk 10, a partition 11, a spring 12, a thrust bearing 13, a second ball nut 14, a bushing 15, a connecting ear 16, and a bolt 17.

[0035] Among them, the mass block 2, the first friction plate 3, the second friction plate 4, the ball 5, the first ball nut 6, the lead screw 7, the turntable 8, the first axially movable disk 9, the second axially movable disk 10, the partition 11, the spring 12, the thrust bearing 13, and the second ball nut 14 are installed in the housing 1. Connecting ears 16 are fixedly installed at one end of the lead screw 7 and one end of the housing 1.

[0036] The lead screw 7 has threads, and the housing 1 is a hollow cylinder. The ball 5 is embedded between the first ball nut 6 and the threads of the lead screw 7 to form a ball screw.

[0037] Figure 3 which is a partial axonometric projection view of the inerter with variable output limit provided by an embodiment of the present application. As shown in Figure 3As shown, the mass block 2 is a hollow cylinder as a whole. The mass blocks 2 can be multiple, for example, at least 2, and this application does not limit this. The multiple mass blocks 2 are connected by bolts 17.

[0038] Figure 4 This is another partial axonometric projection view of the inertor with variable output limit provided by the embodiment of this application. As Figure 4 and Figure 1 shown, the mass block 2 is arranged outside the first ball nut 6 and axially surrounds the first ball nut 6. A first friction plate 3 and a friction sleeve 18 are sequentially arranged between the mass block and the first ball nut. The first friction plate 3 is fixedly arranged inside the mass block 2, and the friction sleeve 18 is fixedly sleeved on the first ball nut 6. The materials of the first friction plate 3 and the friction sleeve 18 can be semi-metal friction plates or paper-based friction materials, and the embodiment of this application does not limit the materials of the friction plates. A pre-tightening force is applied to the friction plate 3 and the friction sleeve 18 between the mass block 2 and the first ball nut 6 through the bolt 17, so that the first friction plate 3 can achieve a large initial frictional force.

[0039] Rotary disks 8 are arranged on both sides of the mass block 2. A second friction plate 4 is fixedly arranged between the rotary disk 8 and the mass block 2. The material of the second friction plate 4 can be a semi-metal friction plate or a paper-based friction material, and the embodiment of this application does not limit the material of the second friction plate 4. As Figure 3 shown, the rotary disk 8, the mass block 2, and the second friction plate 4 are coaxial. The rotary disk 8 and the first ball nut 6 can be connected by splines (the spline connection consists of an internal spline and an external spline. Both the internal and external splines are multi-tooth parts. The spline on the inner cylindrical surface is the internal spline, and the spline on the outer cylindrical surface is the external spline. The advantage of the spline connection is that the force is relatively uniform), so that the rotary disk 8 can rotate with the first ball nut 6 and generate an axial displacement relative to the first ball nut 6.

[0040] Figure 5 This is a semi-sectional axonometric projection view of an inertor with variable output limit provided by the embodiment of this application. As Figure 5 and Figure 1 shown, the first axial movable disk 9 is installed outside the rotary disk 8 and is coaxial with the rotary disk 8. A thrust bearing 13 is arranged between the rotary disk 8 and the first axial movable disk 9. The first axial movable disk 9 and the housing 1 can be connected by splines, so that the first axial movable disk 9 cannot rotate and can generate an axial displacement relative to the housing 1.

[0041] As Figure 1 shown, the partition plate 11 is fixedly installed in the housing 1. The partition plate 11 and the first axial movable disk 9 can be connected by splines. A thrust bearing 13 is arranged between the first ball nut 6 and the partition plate 11, so that the first ball nut 6 can only rotate relative to the housing 1. A second ball nut 14 is arranged between the partition plate 11 and the lead screw 7 to maintain the axis of the lead screw 7 from moving.

[0042] As Figure 1 and Figure 4 shown, an inertor with variable output limit provided by an embodiment of the present application further includes a second axially movable disk 10, which can be connected to the housing 1 through a spline, so that the second axially movable disk 10 cannot rotate and can generate an axial displacement relative to the housing 1. A spring 12 is provided between the second axially movable disk 10 and the first axially movable disk 9, and the first axially movable disk 9 is located between the spring 12 and the turntable 8.

[0043] As Figure 1 and Figure 4 shown, a bushing 15 is fixedly installed on the lead screw 7, and the bushing 15 just contacts the second axially movable disk 10 in the initial state. The housing 1 is fixedly connected to an external structure through a connecting ear 16, and the lead screw 7 is connected to another external structure through the connecting ear 16, so that the lead screw 7 can only perform translational motion relative to the housing 1.

[0044] When the lead screw 7 performs translational motion with the external structure, the first ball nut 6 is driven to rotate through the ball 5, so that the mass block 2 rotates, and thus the inertance is realized, so that the output of the device is related to the accelerations at both ends. When the lead screw 7 performs translational motion with the external structure, the bushing 15 pushes the corresponding second axially movable disk 10, so that the corresponding spring 12 is compressed, thereby applying a pressure to the second friction plate 4, so that the friction force between the second friction plate 4 and the mass block increases.

[0045] When the inertial force of the mass block 2 is greater than the total friction force provided by the first friction plate 3 and the second friction plate 4, the first friction plate 3 and the second friction plate 4 decouple the motion of the mass block 2 from the first ball nut 6 and the turntable 8, that is, there is a rotational speed difference between the mass block 2 and the first ball nut 6 and the turntable 8, thereby limiting the output of the inertor. And the friction force provided by the second friction plate 4 increases with the increase of the absolute value of the displacement of the lead screw 7, thereby realizing the variable characteristic of the output limit of the inertor.

[0046] The embodiments described above are only used to describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present application should fall within the protection scope determined by the claims of the present application.

Claims

1. A inertia container with variable output limit value, characterized in that, It includes a housing (1), a mass block (2), a friction sleeve (18), a first friction plate (3), a second friction plate (4), a ball (5), a first ball nut (6), a lead screw (7), a turntable (8), a first axially movable disk (9), a second axially movable disk (10), a partition plate (11), a spring (12), a thrust bearing (13), a second ball nut (14), a bushing (15), a connecting ear (16), and a bolt (17), where: The lead screw (7) has threads, and the ball (5) is embedded between the threads of the first ball nut (6) and the lead screw (7) to form a ball screw; the mass block (2) is disposed outside the first ball nut (6) and axially surrounds the first ball nut (6), the first friction plate (3) is fixedly disposed inside the mass block (2), and the friction sleeve (18) is fixedly sleeved on the first ball nut (6); The turntable (8) is disposed on both sides of the mass block (2) and is connected to the first ball nut (6) by a spline, and the second friction plate (4) is fixedly disposed between the turntable (8) and the mass block (2); the first axially movable disk (9) is disposed outside the turntable (8) and is coaxial with the turntable (8), and the second axially movable disk (10) is connected to the housing (1), and the spring (12) is provided between the second axially movable disk (10) and the first axially movable disk (9); The bushing (15) is fixedly installed on the lead screw (7), and the bushing (15) can push the second axially movable disk (10) to perform a translational motion. The housing (1) is fixedly connected to an external structure through the connecting ear (16), the lead screw (7) is connected to another external structure through the connecting ear (16), and the lead screw (7) only performs a translational motion relative to the housing (1); The partition plate (11) is connected to the first axially movable disk (9) by a spline; the thrust bearing (13) is provided between the partition plate (11) and the first ball nut (6), and the second ball nut (14) is provided between the partition plate (11) and the lead screw (7); The thrust bearing (13) is provided between the turntable (8) and the first axially movable disk (9), and the first axially movable disk (9) is connected to the housing (1) by a spline.

2. The inertia container with variable output limit value according to claim 1, characterized in that, The second axially movable disk (10) is connected to the housing (1) by a spline.

3. The inertia container with variable output limit value according to claim 1, characterized in that, The bolt (17) is used to apply a pre-tightening force between the first friction plate (3) and the friction sleeve (18).

4. The inertia container with variable output limit value according to claim 3, characterized in that, The housing (1), the mass block (2), and the first ball nut (6) are hollow cylinders.

5. The inertia container with variable output limit value according to claim 4, characterized in that, There are at least two mass blocks (2), which are connected by the bolt (17).

6. The inertia container with variable output limit value according to claim 1, characterized in that, When the lead screw (7) performs a translational motion with the other external structure, the first ball nut (6) is driven to rotate through the ball (5), so that the mass block (2) rotates, thereby realizing an inertance.

7. The inertia container with variable output limit value according to claim 6, characterized in that, When the lead screw (7) makes a translational motion, the bushing (15) pushes the corresponding second axially movable disk (10), so that the corresponding spring (12) is compressed, thereby applying a pressure to the second friction plate (4), increasing the frictional force of the second friction plate (4).

8. The inertia container with variable output limit value according to any one of claims 1-7, characterized in that, When the inertial force of the mass block (2) is greater than the total frictional force provided by the first friction plate (3) and the second friction plate (4), the mass block (2) is decoupled from the motion of the first ball nut (6) and the turntable (8), thereby restricting the output of the inertor, and the frictional force provided by the second friction plate (4) increases with the increase of the absolute value of the displacement of the lead screw (7), thereby realizing the variable characteristic of the output limit value of the inertor.

Images