A single-rod variable friction damper

Abstract

The present invention relates to a single-rod variable friction damper, including a left ball joint seat, a left end cover, a core shaft, a friction disc, a wear-resistant disc, a lead screw, a pinion, a large gear, a cylinder body, a guide slider, a lead screw nut, a connecting rod, an active slider, a right ball joint seat and a right end cover. The right ball joint seat drives the active slider to move along the core shaft, which drives the lead screw nut to reciprocate through the connecting rod, and the reciprocating motion of the lead screw nut drives the lead screw to rotate; when the lead screw rotates, the large gear meshes with the pinion gear for transmission, and the friction disc and the wear-resistant disc perform rubbing motion to generate damping force. The damping force can be changed by changing the number of rubbing plates of the wear-resistant disc and the friction disc; the present invention forms a rotating slider mechanism by connecting parallel lead screws, cylinder body slide grooves, connecting rods and active sliders, and has the advantages of gapless transmission, large axial rigidity, long sliding displacement, strong load-bearing capacity and good dynamic performance.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration reduction and isolation, and in particular relates to a single-rod variable friction damper. Background Art

[0002] With the development of urbanization, high-rise buildings have become the first choice. The stiffness of high-rise buildings is becoming softer and softer, and the damping ratio is getting smaller and smaller. On the one hand, the building is required to be as light and soft as possible, which can reduce the weight and reduce the impact of earthquake forces. On the other hand, the building is required to have a large bearing capacity and stiffness to solve the impact of horizontal loads. If the high-rise building is designed to be too soft, it will not have sufficient stiffness, which will cause excessive horizontal displacement under the action of earthquakes. Therefore, how to do a good job in seismic design of high-rise buildings, in addition to reasonable structural analysis and design, can be combined with methods to control structural vibration to solve the above problems. In earthquake-prone areas, high-rise buildings usually use shear walls, cabinet frames and other structures to improve their seismic resistance. In this way, by increasing the size of beams and columns to improve the strength and stiffness of the structure, it is bound to increase the weight of reinforced concrete and increase the cost. A large number of studies and engineering practices have shown that displacement-related dampers, velocity-related dampers, composite energy dissipation dampers and seismic isolation bearings can effectively reduce the seismic response of the structure and improve the seismic performance of the structure.

[0003] Due to the high performance, low cost, no need for sealing, easy production and installation of friction dampers, they have good heat and weather resistance, large displacement capacity, good energy dissipation effect, and no yield phenomenon during effective operation, and have good wind resistance. At present, friction dampers are generally sandwich plate friction. In actual operation, the middle friction steel plate of the damper often suffers from out-of-plane instability, and the pressure on the steel plates on both sides is too high, which can easily cause warping and other problems, reducing the energy dissipation effect and even causing the damper to fail. Summary of the invention

[0004] Based on the current situation that the sandwich plate friction damper in the prior art is prone to performance failure, the present invention provides a single-rod variable friction damper.

[0005] The single-rod friction damper of the present invention adopts a parallel screw connecting rod mechanism and gear transmission, and has the advantages of good axial rigidity, large sliding displacement, good energy dissipation effect and centering stability.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a single-rod variable friction damper, comprising a left ball joint seat, a left end cover, a core shaft, a friction disc, a wear-resistant disc, a lead screw, a small gear, a large gear, a cylinder body, a guide slider, a lead screw nut, a connecting rod, an active slider, a right ball joint seat and a right end cover.

[0008] The left ball joint seat is connected to the left end cover, the right ball joint seat passes through the right end cover, and the cylinder body is connected between the left end cover and the right end cover.

[0009] The two ends of the mandrel are connected to the left end cover and the right end cover respectively, and the wear-resistant disc, the large gear and the active slider are arranged on the mandrel.

[0010] The lead screw is parallel to the core shaft and is provided in plurality. The friction disc, pinion gear and lead screw nut are provided on the lead screw. A guide slider is fixed outside the lead screw nut.

[0011] The friction disc is meshed with the wear-resistant disc, and the pinion is meshed with the large gear.

[0012] The guide slider is connected to the active slider and the right ball joint seat through a connecting rod.

[0013] The right ball joint seat drives the active slider to move along the core shaft, which will drive the screw nut to reciprocate through the connecting rod, and the reciprocating motion of the screw nut drives the screw to rotate; when the screw rotates, the large gear and the small gear mesh and transmit, and the friction plate and the wear-resistant plate perform rubbing motion to generate damping force.

[0014] In one embodiment of the present invention, the lead screw is evenly distributed around the mandrel, the lead screw and the pinion gear on the lead screw, the lead screw nut fixed with the guide slider and the friction disk are evenly distributed around the mandrel, with good centering, uniform force and compact structure.

[0015] In one embodiment of the present invention, the requirements of different damper stiffness can be met by changing the number of the lead screws.

[0016] In one embodiment of the present invention, the lead screws are evenly distributed in three groups around the core shaft.

[0017] In one embodiment of the present invention, the right end cover is provided with a through hole for accommodating the right ball joint seat to pass through, so as to avoid interference when the right ball joint seat moves.

[0018] In one embodiment of the present invention, when the lead screw is arranged in three groups, the right ball joint seat is provided with three extension rods, and the right end cover is provided with strip-shaped through holes distributed in a trident shape, through which the three extension rods of the right ball joint seat can pass, so as to avoid interference when the right ball joint seat moves.

[0019] In one embodiment of the present invention, the inner side of the cylinder body is provided with evenly distributed concave grooves to constrain the guide slider, and guide and support the movement of the guide slider and the lead screw nut. The guide slider with the lead screw nut fixed thereon moves in the concave groove of the cylinder body, which can guide the lead screw nut well and also radially constrain the lead screw, thereby ensuring the stability of the mechanism.

[0020] In one embodiment of the present invention, a sliding bearing is provided on the lead screw, and the sliding bearing is slidably supported on the inner surface of the cylinder body. The lead screw is supported by the sliding bearing, which can increase the rigidity and dynamic stability of the system.

[0021] In one embodiment of the present invention, the active slider, the guide slider and the connecting rod are all hinged by a cylindrical pin, which can ensure that the three can rotate relative to each other at a certain angle, thereby solving the problem of rigid impact.

[0022] In one embodiment of the present invention, the left ball joint seat is connected to the left end cover by threads and is prevented from loosening by a locking nut. The center distance of the single-rod damping can be fine-tuned by adjusting the tightening depth of the threads.

[0023] In one embodiment of the present invention, ball bearings are provided in both the left ball joint seat and the right ball joint seat.

[0024] In one embodiment of the present invention, the damping force can be adjusted by changing the number of friction discs and wear-resistant discs that are in contact with each other.

[0025] In one embodiment of the present invention, the friction disc and the wear-resistant disc can be made of friction materials including metal materials, non-metal materials or composite materials. The friction disc has a good inertia effect as a mass flywheel and can play a good role in amplifying the friction force. Common metal materials can be selected as stainless steel, non-metal materials can be selected as PTFE, and composite materials can be selected as SF strips, etc.

[0026] In the present invention, the meshing transmission of a large gear and uniformly distributed small gears can eliminate axial clearance, reduce processing and installation errors, thereby improving product accuracy and preventing the guide slider from getting stuck in the cylinder slideway. At the same time, it can adjust the speed of the parallel-connected lead screws to generate variable output force, and can also improve the axial rigidity of the system, increase the axial bearing capacity and stability.

[0027] In the present invention, a rotating slider mechanism is formed by a lead screw, a connecting rod and an active slider arranged in parallel, which has the advantages of gapless transmission, large axial rigidity, long sliding displacement, strong load-bearing capacity, good dynamic performance and the like.

[0028] The principle of the single-rod variable friction damper of the present invention is:

[0029] The center distance of the initial position is constant. When the right ball joint seat is excited by external vibration, it will drive the connected active slider to move along the core shaft; the active slider drives the guide slider to make a linear motion along the concave groove of the cylinder body through the connecting rod, and drives the screw nut fixed to the guide slider to make a reciprocating motion, thereby making the screw rotate; the large gear fixed on the core shaft meshes with the small gear fixed on the screw for transmission, and at the same time, the wear-resistant disk fixed on the core shaft and the friction disk fixed on the screw make a friction motion. The stiffness of the system can be adjusted by changing the number of parallel-connected screws, and the friction force can be adjusted by changing the number of friction disks and counter-grinding disks, so that the damper can achieve the effect of adjustable output damping force.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] First, the present invention provides a single-rod variable friction damper, in which the parallel screws are all supported by sliding bearings, which can increase the system stiffness and dynamic stability. At the same time, the requirements of different damper stiffness can be met by changing the number of parallel screws.

[0032] Second, the single-rod variable friction damper provided by the present invention adopts a large gear and evenly distributed small gears for meshing transmission, which can eliminate axial clearance, reduce processing and installation errors, thereby improving product accuracy, preventing the guide slider from getting stuck in the cylinder slide groove, and at the same time can adjust the system speed to produce variable output force.

[0033] Third, the single-rod variable friction damper provided by the present invention can adjust the friction force by changing the number of engagements between the friction disk and the wear-resistant disk. The friction disk, as a mass flywheel, has a good inertia effect and can amplify the friction force.

[0034] In summary, the single-rod variable friction damper of the present invention is different from the conventional sandwich plate friction damper and will not cause problems such as out-of-plane instability or warping. It adopts a parallel screw connecting rod mechanism and gear transmission, and has excellent effects such as compact structure, large sliding displacement, stable centering, large axial stiffness, and adjustable output damping force.

[0035] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic cross-sectional structure diagram of the single-rod variable friction damper in Example 1 of the present invention.

[0037] Figure 2 It is a schematic diagram of the three-dimensional structure of the single-rod variable friction damper in Example 1 of the present invention.

[0038] Figure 3 It is a partial cross-sectional view of the single-rod variable friction damper in Example 1 of the present invention.

[0039] Numbers in the figure: 1. Left ball joint seat; 2. Ball bearing; 3. Locking nut; 4. Left end cover; 5. Mandrel; 6. Friction disk; 7. Wear-resistant disk; 8. Lead screw; 9. Pinion; 10. Large gear; 11. Cylinder body; 12. Sliding bearing; 13. Guide slider; 14. Lead screw nut; 15. Connecting rod; 16. Cylindrical pin; 17. Active slider; 18. Right ball joint seat; 19. Right end cover. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean direct connection or indirect connection through an intermediate medium, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] Example 1

[0046] The present embodiment provides a single-rod variable friction damper, comprising a left ball joint seat 1, a left end cover 4, a spindle 5, a friction disc 6, a wear-resistant disc 7, a lead screw 8, a small gear 9, a large gear 10, a cylinder body 11, a guide slider 13, a lead screw nut 14, a connecting rod 15, an active slider 17, a right ball joint seat 18 and a right end cover 19.

[0047] The left ball joint seat 1 is connected to the left end cover 4, the right ball joint seat 18 passes through the right end cover 19, and the cylinder body 11 is connected between the left end cover 4 and the right end cover 19.

[0048] The two ends of the mandrel 5 are connected to the left end cover 4 and the right end cover 19 respectively. The wear-resistant disc 7, the large gear 10 and the active slider 17 are arranged on the mandrel 5.

[0049] The lead screw 8 is parallel to the core shaft 5 and is provided in plurality. The friction plate 6, the pinion gear 9 and the lead screw nut 14 are provided on the lead screw 8. A guide slider 13 is fixed outside the lead screw nut 14.

[0050] The friction plate 6 is meshed with the wear plate 7, and the pinion 9 is meshed with the large gear 10.

[0051] The guide slider 13 is connected to the active slider 17 and the right ball joint seat 18 through the connecting rod 15.

[0052] The right ball joint seat 18 drives the active slider 17 to move along the core shaft 5, which will drive the screw nut 14 to reciprocate through the connecting rod 15, and the reciprocating motion of the screw nut 14 drives the screw 8 to rotate; when the screw 8 rotates, the large gear 10 and the small gear 9 mesh and transmit, and the friction plate 6 and the wear-resistant plate 7 perform friction motion to generate damping force.

[0053] In this embodiment, the lead screw 8 is evenly distributed in three groups around the mandrel 5. The lead screw 8 and the pinion 9 on the lead screw 8, the lead screw nut 14 fixed with the guide slider 13 and the friction plate 6 are evenly distributed around the mandrel 5, with good centering, uniform force and compact structure.

[0054] In this embodiment, the right side end cover 19 is provided with a through hole for accommodating the right ball joint seat 18 to pass through, so as to avoid interference when the right ball joint seat 18 moves.

[0055] In this embodiment, when the lead screw 8 is arranged in three groups, the right ball joint seat 18 is provided with three extension rods, and the right end cover 19 is provided with strip-shaped through holes distributed in a trident shape, so that the three extension rods of the right ball joint seat 18 can pass through, so as to avoid interference when the right ball joint seat 18 moves.

[0056] In this embodiment, the inner side of the cylinder body 11 is provided with evenly distributed concave grooves to constrain the guide slider 13, and guide and support the movement of the guide slider 13 and the lead screw nut 14. The guide slider 13 with the lead screw nut 14 fixed thereon moves in the concave groove of the cylinder body 11, which can guide the lead screw nut 14 well, and can also restrain the lead screw 8 in the radial direction, thereby ensuring the stability of the mechanism.

[0057] In this embodiment, a sliding bearing 12 is provided on the lead screw 8, and the sliding bearing 12 is slidably supported on the inner surface of the cylinder body 11. The lead screw 8 is supported by the sliding bearing 12, which can increase the rigidity and dynamic stability of the system.

[0058] In this embodiment, the active slider 17, the guide slider 13 and the connecting rod 15 are all hinged by the cylindrical pin 16, which can ensure that the three can rotate relative to each other at a certain angle, thereby solving the problem of rigid impact.

[0059] In this embodiment, the left ball joint seat 1 is connected to the left end cover 4 by threads and is prevented from loosening by a locking nut 3. The center distance of the single-rod damping can be fine-tuned by adjusting the tightening depth of the threads.

[0060] In this embodiment, the left ball joint seat 1 and the right ball joint seat 18 are both provided with ball bearings 12 .

[0061] In this embodiment, the damping force can be adjusted by changing the number of friction discs 6 and wear-resistant discs 7 that are in contact with each other.

[0062] In this embodiment, the friction disc 6 and the wear-resistant disc 7 can be made of friction materials including metal materials, non-metallic materials or composite materials. The friction disc 6 has a good inertia effect as a mass flywheel, which can play a good role in amplifying the friction force. Common metal materials can be selected as stainless steel, non-metallic materials can be selected as PTFE, and composite materials can be selected as SF strips, etc.

[0063] In this embodiment, the large gear 10 and the uniformly distributed small gears 9 are meshed and driven to eliminate axial clearance, reduce processing and installation errors, thereby improving product accuracy and preventing the guide slider 13 from getting stuck in the slide groove of the cylinder body 11. At the same time, the speed of the parallel-connected lead screw 8 can be adjusted to generate variable output force, and the axial rigidity of the system can be improved, thereby increasing the axial bearing capacity and stability.

[0064] In this embodiment, the rotating slider mechanism is formed by the lead screw 8, connecting rod 15 and active slider 17 arranged in parallel, which has the advantages of gapless transmission, large axial rigidity, long sliding displacement, strong load-bearing capacity and good dynamic performance.

[0065] The principle of the single-rod variable friction damper of this embodiment is:

[0066] The center distance of the initial position is constant. When the right ball joint seat 18 is excited by external vibration, it will drive the connected active slider 17 to move along the core shaft 5; the active slider 17 drives the guide slider 13 to make a linear motion along the concave groove of the cylinder body 11 through the connecting rod 15, and drives the screw nut 14 fixed to the guide slider 13 to make a reciprocating motion, so that the screw 8 makes a rotational motion; the large gear 10 fixed on the core shaft 5 and the small gear 9 fixed on the screw 8 are meshed for transmission, and at the same time, the wear-resistant disk 7 fixed on the core shaft 5 and the friction disk 6 fixed on the screw 8 make a friction motion. The stiffness of the system can be adjusted by changing the number of parallel-arranged screws 8, and the friction force can be adjusted by changing the number of friction disks 6 and counter-wear disks 7, so that the damper can achieve the effect of adjustable output damping force.

[0067] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A single-rod variable friction damper, characterized in that: It comprises a left ball joint seat (1), a left end cover (4), a core shaft (5), a friction disc (6), a wear-resistant disc (7), a lead screw (8), a small gear (9), a large gear (10), a cylinder body (11), a guide slider (13), a lead screw nut (14), a connecting rod (15), an active slider (17), a right ball joint seat (18) and a right end cover (19). The left ball joint seat (1) is connected to the left end cover (4), the right ball joint seat (18) passes through the right end cover (19), and the cylinder body (11) is connected between the left end cover (4) and the right end cover (19). The two ends of the core shaft (5) are respectively connected to the left end cover (4) and the right end cover (19); the wear-resistant disc (7), the large gear (10) and the active slider (17) are arranged on the core shaft (5). The lead screw (8) is parallel to the core shaft (5) and is provided in plurality. The friction disc (6), the pinion gear (9) and the lead screw nut (14) are provided on the lead screw (8). A guide slider (13) is fixed outside the lead screw nut (14). The friction disk (6) and the wear-resistant disk (7) are meshed with each other, and the pinion (9) and the large gear (10) are meshed with each other. The guide slider (13) is connected to the active slider (17) and the right ball joint seat (18) through a connecting rod (15). The right ball joint seat (18) drives the active slider (17) to move along the core shaft (5), which drives the lead screw nut (14) to move back and forth through the connecting rod (15), and the reciprocating motion of the lead screw nut (14) drives the lead screw (8) to rotate; when the lead screw (8) rotates, the large gear (10) and the small gear (9) mesh and transmit, and the friction plate (6) and the wear-resistant plate (7) perform friction motion to generate damping force.

2. A single-rod variable friction damper according to claim 1, characterized in that: The lead screws (8) are evenly distributed around the core shaft (5) in a circumferential manner, and the requirements for different damper stiffness can be met by changing the number of the lead screws (8).

3. A single-rod variable friction damper according to claim 2, characterized in that: The lead screws (8) are evenly distributed in three groups around the core shaft (5).

4. The single-rod variable friction damper according to claim 1, characterized in that: The right end cover (19) is provided with a through hole for accommodating the right ball joint seat (18) to pass through, so as to avoid interference when the right ball joint seat (18) moves.

5. The single-rod variable friction damper according to claim 1, characterized in that: The inner side surface of the cylinder body (11) is provided with evenly distributed concave sliding grooves for constraining the guide slider (13) and guiding and supporting the movement of the guide slider (13) and the lead screw nut (14).

6. The single-rod variable friction damper according to claim 1, characterized in that: The lead screw (8) is provided with a sliding bearing (12), and the sliding bearing (12) is slidably supported on the inner surface of the cylinder body (11).

7. The single-rod variable friction damper according to claim 1, characterized in that: The active slider (17), the guide slider (13) and the connecting rod (15) are all hinged via a cylindrical pin (16).

8. The single-rod variable friction damper according to claim 1, characterized in that: The left ball joint seat (1) is connected to the left end cover (4) by threads, and is prevented from loosening by a locking nut (3). The center distance of the single output rod damping is fine-tuned by adjusting the tightening depth of the threads.

9. The single-rod variable friction damper according to claim 1, characterized in that: The left ball joint seat (1) and the right ball joint seat (18) are both provided with ball bearings (12).

10. The single-rod variable friction damper according to claim 1, characterized in that: The damping force is adjusted by changing the number of friction discs (6) and wear-resistant discs (7) that are in contact with each other and rub against each other.

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