A ball screw inertia damper

Abstract

The present invention relates to the field of energy dissipation and shock absorption technology, and in particular to a ball screw inertia damper. The device comprises a front end plate and a rear end plate that are relatively arranged, and a first planetary gear set, a second planetary gear set, a flywheel, and a bearing located therebetween. The present invention uses a ball screw, a first planetary gear set, a second planetary gear set, and a flywheel in combination, with the second sun gear serving as the input end connected to the ball screw and the first sun gear serving as the output end connected to the flywheel. When the front end plate and the rear end plate undergo relative motion, the axial speed input by the ball screw can be converted and amplified into high-speed rotation of the flywheel. Furthermore, the present invention is easy to disassemble and maintain, can adapt to different requirements for equivalent mass, and achieve the best shock absorption effect.

Description

Technical Field

[0001] The present invention relates to the technical field of energy dissipation and vibration reduction, and in particular to a ball screw inertia damper. Background Art

[0002] A categorized analysis of over 130 major earthquake disasters worldwide reveals that over 95% of these casualties were caused by the damage and collapse of buildings and structures. Therefore, ensuring that buildings and structures are properly seismically protected against damage and collapse during destructive earthquakes is crucial to preventing casualties. Seismic damping technology is a cost-effective method for suppressing structural vibration.

[0003] With the development of structural vibration control technology, the application of inertial capacity dampers is becoming increasingly widespread. Inertial dampers are structural vibration-absorbing devices based on the principle of mass inertia, and can be used to reduce the vibration amplitude of structures in earthquakes or other vibrating environments. However, conventional inertial dampers currently on the market have several issues that not only affect their performance and service life but also pose safety risks.

[0004] First, ordinary inertial dampers cannot meet the different requirements for the equivalent mass of the damper in different seismic environments. In a seismic environment, the mass inertia of the damper is the key factor for the damper to play a shock-absorbing role. However, the equivalent mass requirements for the damper are different in different seismic environments. For example, in high-seismic areas, the damper is required to have a higher equivalent mass in order to effectively reduce shock. In low-seismic areas, the damper is required to have a lower equivalent mass to prevent the damper from adversely affecting the stiffness and natural vibration period of the structure. Ordinary inertial dampers currently on the market do not optimize the equivalent mass according to different seismic environments, which leads to the limited effect of ordinary inertial dampers in different seismic environments.

[0005] Secondly, conventional inertial dampers are subject to issues such as aging or damage. Over time, they can become damaged or their performance degraded due to long-term operation or earthquakes. Conventional inertial dampers can only be disassembled and replaced as a whole, increasing maintenance costs and negatively impacting the safety of the device.

[0006] Finally, conventional inertial dampers are too bulky. Given the same equivalent mass requirements, the flywheel size is larger with conventional inertial dampers. This complicates the design and construction of the structure and also limits the damper's application.

[0007] In this context, the present invention provides a ball screw inertia damper that is easy to change the equivalent mass, convenient to maintain, and small in size. Summary of the Invention

[0008] The object of the present invention is to provide a ball screw inertia damper, which is easy to disassemble and maintain, can adapt to different requirements for equivalent mass, achieve optimal shock absorption effect, and solve the problems raised in the background technology.

[0009] The present invention provides a ball screw inertia damper, comprising a first planetary gear set, a second planetary gear set, and a front end plate and a rear end plate arranged opposite to each other; a rear sleeve is provided at the center of the rear end plate;

[0010] The first planetary gear set includes a first sun gear, the outer side of the first sun gear is meshed with a plurality of first planet teeth, the other ends of the first planet teeth are meshed with a first ring gear, and the first planet teeth are connected to each other via a first planet carrier; the second planetary gear set includes a second sun gear, the outer side of the second sun gear is meshed with a plurality of second planet teeth, the other ends of the second planet teeth are meshed with a second ring gear, and the second planet teeth are connected to each other via a second planet carrier;

[0011] One side of the front end plate is connected to the outer sleeve, the interior of the outer sleeve is slidably connected to the inner sleeve, the other end of the inner sleeve is fixedly connected to the second planet carrier, the second ring gear is fixedly connected to the first ring gear, the second sun gear is connected to the first planet carrier, the first sun gear is connected to the flywheel, the other end of the flywheel is connected to the bearing, and the other end of the bearing is connected to the rear sleeve;

[0012] A ball screw is provided inside the inner sleeve, and the ball screw passes through the second sun gear, the first sun gear, the flywheel and the bearing in sequence and is inserted into the rear sleeve. A ball nut is provided on the ball screw, and the second sun gear and the first planetary carrier are fixedly connected to the ball nut.

[0013] Preferably, the inner sleeve is composed of a plurality of arc-shaped sleeve walls, a protrusion is formed at the connection between adjacent arc-shaped sleeve walls, and the inner wall of the outer sleeve is provided with a groove corresponding to the protrusion, and the protrusion slides along the groove.

[0014] Preferably, one end of the inner sleeve is fixedly connected to a flange, and the flange is connected to the second planet carrier by bolts.

[0015] Preferably, the flywheel is connected to the bearing outer ring, and the rear sleeve is connected to the bearing inner ring.

[0016] Preferably, the first planet gears are pivotally connected to the first planet carrier via a first planet gear latch, and the second planet gears are pivotally connected to the second planet carrier via a second planet gear latch.

[0017] Preferably, one end of the ball screw close to the front end plate is detachably connected to the connecting rod, and the other end of the connecting rod is fixedly connected to the front end plate.

[0018] Preferably, the calculation formula of the inertia equivalent mass magnification coefficient K obtained by the cooperation of the first planetary gear set and the second planetary gear set is as follows:

[0019] K = 1 + a1 + a1 / a2 Formula 1;

[0020] The calculation formulas for a1 and a2 are as follows:

[0021] a1=r R1 / r S1 , a2=r R2 / r S2 Formula 2;

[0022] where r R1 is the radius of the first gear ring, r S1 is the radius of the first sun gear; r R2 is the radius of the second gear ring, r S2 is the radius of the second sun gear.

[0023] Preferably, the stroke magnification S of the ball screw i The calculation formula is as follows:

[0024] S i =2π / L d Formula 3;

[0025] Among them L d is the lead of the ball screw.

[0026] Preferably, the inertia equivalent mass m of the flywheel is r The calculation formula is as follows:

[0027] m r =K×1 / 2×S i 2 ×(r0 2 +r i 2 ) Formula 4;

[0028] Where r0 is the inner radius of the flywheel, r i is the outer radius of the flywheel.

[0029] Beneficial effects:

[0030] The present invention cooperates with a ball screw, a first planetary gear set, a second planetary gear set and a flywheel, with the second sun gear as the input end connected to the ball screw, and the first sun gear as the output end connected to the flywheel. When the front end plate and the rear end plate move relative to each other, the axial speed input by the ball screw can be converted and amplified into high-speed rotation of the flywheel.

[0031] The second planetary gear set in the present invention is removable and replaceable. By varying the second planetary gears, second planet carrier, and second ring gear, the rotational speed of the first ring gear, which is fixedly connected to the second ring gear, can be varied while maintaining the same axial speed of the ball screw. This, in turn, changes the transmission ratio between the first planet carrier and the first sun gear, thereby varying the amplification effect on the ball screw's speed and the flywheel's equivalent inertial mass. Consequently, the present invention can adapt to varying requirements for equivalent inertial mass and achieve optimal shock absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a three-dimensional schematic diagram of the present invention with some structures omitted;

[0035] Figure 3 Schematic diagram of the structure of the second planetary gear set of the present invention;

[0036] Figure 4 This is a schematic structural diagram of the first planetary gear set of the present invention.

[0037] Description of reference numerals:

[0038] 1-front end plate, 2-outer sleeve, 3-inner sleeve, 4-protrusion, 5-flange, 6-second planetary gear set, 601-second sun gear, 602-second planetary gear, 603-second ring gear, 604-second planetary carrier, 605-second planetary gear pin, 7-first planetary gear set, 701-first planetary carrier, 702-first ring gear, 703-first planetary gear, 704-first planetary gear pin, 705-first sun gear, 8-flywheel, 9-bearing, 901-bearing outer ring, 902-bearing inner ring, 10-rear sleeve, 11-rear end plate, 12-wing end, 13-ball screw, 14-connecting rod, 15-groove, 16-ball nut, 17-limiting groove. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] Example 1

[0043] like Figure 1-4 As shown, a ball screw inertia damper includes a first planetary gear set 7, a second planetary gear set 6, and a front end plate 1 and a rear end plate 11 that are arranged opposite to each other; a rear sleeve 10 is provided at the center of the rear end plate 11.

[0044] The first planetary gear set 7 includes a first sun gear 705, the outer side of which meshes with a plurality of first planetary teeth 703. The other ends of the first planetary teeth 703 mesh with a first ring gear 702. The first planetary teeth 703 are connected to each other via a first planet carrier 701. The second planetary gear set 6 includes a second sun gear 601, the outer side of which meshes with a plurality of second planetary teeth 602. The other ends of the second planetary teeth 602 mesh with a second ring gear 603. The second planetary teeth 602 are connected to each other via a second planet carrier 604. The first planetary teeth 703 are pivotally connected to the first planet carrier 701 via a first planetary gear latch 704, and the second planetary teeth 602 are pivotally connected to the second planet carrier 604 via a second planetary gear latch 605. As a result, the first planetary teeth 703 do not move relative to the first planet carrier 701, and the second planetary teeth 602 do not move relative to the second planet carrier 604.

[0045] One side of the front end plate 1 is connected to the outer sleeve 2, and the interior of the outer sleeve 2 is slidably connected to the inner sleeve 3. The inner sleeve 3 is composed of a plurality of arcuate sleeve walls, preferably three arcuate sleeve walls, and a protrusion 4 is formed at the connection between adjacent arcuate sleeve walls. The inner wall of the outer sleeve 2 is provided with a groove 15 corresponding to the protrusion 4. The protrusion 4 can slide along the groove 15 to prevent relative rotation between the inner sleeve 3 and the outer sleeve 2.

[0046] The end of the curved sleeve wall facing away from the outer sleeve 2 is fixedly connected to a flange 5, which is bolted to the second planet carrier 604. Due to the fit between the groove 15 and the protrusion 4, the second planet carrier 604 cannot rotate relative to the front plate 1. The second ring gear 603 is fixedly connected to the first ring gear 702 via a connector. The connector is sufficiently rigid to ensure that the second ring gear 603 and the first ring gear 702 rotate at the same speed. The second sun gear 601 is connected to the first planet carrier 701, the first sun gear 705 is connected to the front face of the flywheel 8, and the rear face of the flywheel 8 is connected to the bearing outer ring 901. The front and rear faces of the flywheel 8 are each equipped with four outwardly extending wing tips 12, which connect the flywheel 8 to the first sun gear 705 and the bearing outer ring 901 respectively. Corresponding wing tips 12 are provided on the first sun gear 705 and the bearing outer ring 901 to facilitate connection. The rear sleeve 10 is bolted to the bearing inner ring 902. This ensures that the rotational speeds of the first sun gear 705 , the flywheel 8 and the bearing 9 are equal and that no relative movement in the axial direction occurs.

[0047] A ball screw 13 is mounted within the inner sleeve 3. The ball screw 13 sequentially passes through the second sun gear 601, the first sun gear 705, the flywheel 8, and the bearing 9, and is inserted into the rear sleeve 10. The ball screw 13 is slidably connected to the rear sleeve 10. A ball nut 16 is mounted on the ball screw 13, and the ball nut 16, the second sun gear 601, and the first planet carrier 701 are fixedly connected. Track holes are reserved for ball movement in the second sun gear 601 and the first planet carrier 701. The ball movement of the ball screw 13 is a combination of external and internal circulation. A complete cycle path first moves along the track of the ball screw 13, then enters the ball nut 16, and then passes through the holes in the second sun gear 601 and the first planet carrier 701, thereby driving the ball nut 16, the second sun gear 601, and the first planet carrier 701 to rotate. Because the combined force exerted by the balls on the second sun gear 601 and the first planet carrier 701 is equal, their rotational speeds are also maintained. The ball screw 13 is removably connected to the connecting rod 14 at one end near the front end plate 1, while the other end of the connecting rod 14 is fixedly connected to the front end plate 1. A retaining groove 17 is provided within the outer sleeve 3, which is fixedly connected to the front end plate 1 and sleeved onto the outside of the connecting rod 14 for greater stability. Bolts and nuts are used to connect the ball screw 13 and the connecting rod 14. When disassembling the connecting rod 14 and the ball screw 13, tools can be used to distance them from each other, facilitating removal and replacement of the second planetary gear set 6. The second ring gear 603, second planetary gears 602, second planet carrier 604, and second sun gear 601 of the second planetary gear set 6 can be removed and replaced based on the required inertia.

[0048] The calculation formula of the inertia equivalent mass magnification coefficient K obtained by the cooperation of the first planetary gear set 7 and the second planetary gear set 6 is as follows:

[0049] K = 1 + a1 + a1 / a2 Formula 1;

[0050] The calculation formulas for a1 and a2 are as follows:

[0051] a1=r R1 / r S1 , a2=r R2 / r S2 Formula 2;

[0052] where r R1 is the radius of the first gear ring 702, r S1 is the radius of the first sun gear 705; r R2 is the radius of the second gear ring 603, r S2 is the radius of the second sun gear 601. By disassembling and replacing the second ring gear 603 and the second sun gear 601, changing their radius ratio can change the amplification factor, thereby changing the inertia equivalent mass of the flywheel 8.

[0053] The stroke magnification S of the ball screw 13 i The calculation formula is as follows:

[0054] S i =2π / L d Formula 3;

[0055] Among them L d is the lead of the ball screw 13.

[0056] When an earthquake causes the front plate 1 and the rear plate 11 of the damper to move relative to each other, the axial motion of the ball screw 13 is converted into the rotational motion of the flywheel 8 through the ball nut 16 and the cooperation between the first planetary gear set 7 and the second planetary gear set 6, causing the flywheel 8 to generate an inertial equivalent mass far greater than its physical mass. Under the same inertial equivalent mass requirements, the flywheel 8 used in the present invention is smaller in size, which improves space utilization and reduces production costs. The inertial equivalent mass of the flywheel 8 is m r The calculation formula is as follows:

[0057]

[0058] Where r0 is the inner radius of the flywheel 8, r i is the outer radius of the flywheel 8.

[0059] Working principle:

[0060] When earthquake excitation acts on a building structure, the structure vibrates, and the vibration energy is input into the inertia damper of the ball screw 13 of the present invention to dissipate energy. The energy dissipation process is as follows: relative displacement occurs between the front end plate 1 and the rear end plate 11, driving the ball screw 13 to perform linear axial motion. The ball screw 13 converts the axial motion into rotational motion. The balls drive the ball nut 16 to rotate. The ball nut 16 is connected to the second sun gear 601 at the input end, and the first sun gear 705 is connected to the flywheel 8 as the output end, so that the flywheel 8 generates an inertial equivalent mass that is much larger than its physical mass, thereby dissipating energy.

[0061] The present invention also allows for the removal and replacement of the second ring gear 603, second planetary gears 602, and second planetary carrier 604 based on the inertial equivalent mass requirements in different seismic environments, achieving optimal shock absorption. If the first and second planetary gear sets 7 and 6 become damaged or their performance degrades due to factors such as earthquakes, the inertial capacity damper can be restored by replacing the entire planetary gear set. For inertial capacity dampers installed on a structure, these replacement operations can be completed without removing the damper, improving construction convenience.

[0062] Disassembly steps:

[0063] Disassemble the flange 5 from the second planet carrier 604 and use a jack to compress the inner sleeve 3 into the outer sleeve 2 until the connecting rod 14 emerges.

[0064] Disassemble the connecting rod 14 and the ball screw 13, and move the ball screw 13 horizontally toward the rear end plate 11, leaving enough space for disassembly;

[0065] Release the connection between the second ring gear 603 and the first ring gear 702, and then remove the second ring gear 603, the second planetary gear latch 605, the second planetary carrier 604, the second planetary gear 602, and the second sun gear 601 in sequence;

[0066] Disassemble the flywheel 8 and the first sun gear 705, remove the first ring gear 702 and the second planetary gear latch 605, and then remove the first planet carrier 701, the first planetary gear 703, and the first sun gear 705 in sequence.

[0067] The installation steps are the reverse of the above steps.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ball screw inertia damper, characterized in that: It includes a first planetary gear set, a second planetary gear set, and a front end plate and a rear end plate that are arranged opposite to each other; a rear sleeve is provided at the center of the rear end plate; The first planetary gear set includes a first sun gear, the outer side of the first sun gear is meshed with a plurality of first planet teeth, the other ends of the first planet teeth are meshed with a first ring gear, and the first planet teeth are connected to each other via a first planet carrier; the second planetary gear set includes a second sun gear, the outer side of the second sun gear is meshed with a plurality of second planet teeth, the other ends of the second planet teeth are meshed with a second ring gear, and the second planet teeth are connected to each other via a second planet carrier; One side of the front end plate is connected to the outer sleeve, the interior of the outer sleeve is slidably connected to the inner sleeve, the other end of the inner sleeve is fixedly connected to the second planet carrier, the second ring gear is fixedly connected to the first ring gear, the second sun gear is connected to the first planet carrier, the first sun gear is connected to the flywheel, the other end of the flywheel is connected to the bearing, and the other end of the bearing is connected to the rear sleeve; A ball screw is provided inside the inner sleeve, and the ball screw passes through the second sun gear, the first sun gear, the flywheel and the bearing in sequence and is inserted into the rear sleeve. A ball nut is provided on the ball screw, and the second sun gear and the first planetary carrier are fixedly connected to the ball nut.

2. The ball screw inertia damper according to claim 1, characterized in that: The inner sleeve is composed of a plurality of arc-shaped sleeve walls, and a protrusion is formed at the connection between adjacent arc-shaped sleeve walls. The inner wall of the outer sleeve is provided with a groove corresponding to the protrusion, and the protrusion slides along the groove.

3. The ball screw inertia damper according to claim 2, characterized in that: One end of the inner sleeve is fixedly connected to a flange, and the flange is connected to the second planet carrier through bolts.

4. The ball screw inertia damper according to claim 1, characterized in that: The bearing comprises a bearing outer ring and a bearing inner ring, the flywheel is connected to the bearing outer ring, and the rear sleeve is connected to the bearing inner ring.

5. The ball screw inertia damper according to claim 1, characterized in that: The first planetary gears are all pivotally connected to the first planet carrier via a first planetary gear latch, and the second planetary gears are all pivotally connected to the second planet carrier via a second planetary gear latch.

6. The ball screw inertia damper according to claim 1, characterized in that: One end of the ball screw close to the front end plate is detachably connected to the connecting rod, and the other end of the connecting rod is fixedly connected to the front end plate.

7. The ball screw inertia damper according to claim 1, characterized in that: The inertia equivalent mass magnification coefficient obtained by the cooperation of the first planetary gear set and the second planetary gear set K The calculation formula is as follows: Formula 1: The calculation formulas for a1 and a2 are as follows: , Formula 2: in r R1 is the radius of the first gear ring, r S1 is the radius of the first sun gear; r R2 is the radius of the second gear ring, r S2 is the radius of the second sun gear.

8. The ball screw inertia damper according to claim 7, characterized in that: The stroke magnification of the ball screw S i The calculation formula is as follows: Formula 3: in L d is the lead of the ball screw.

9. The ball screw inertia damper according to claim 8, characterized in that: Inertia equivalent mass of the flywheel m r The calculation formula is as follows: Formula 4: in r 0 is the inner radius of the flywheel, r i is the outer radius of the flywheel.

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