Flywheel type magnetorheological inertia device with continuously adjustable inertia coefficient and assembly method thereof

Abstract

The present invention relates to a flywheel-type magnetorheological inertia device with a continuously adjustable inertia coefficient and its assembly method. The device comprises an upper cover, a lower cover, and an outer sleeve. The upper, lower, and outer sleeves are connected to form an internal cavity, which contains a flywheel assembly, a ball screw, and a screw nut. Both the upper and lower covers have central holes, including one in the upper cover and one in the lower cover. A guide rod is fixed in the central hole of the lower cover. A connecting sleeve is inserted through the central hole of the upper cover. The ball screw passes through the connecting sleeve and the lower cover, and is inserted into the screw nut and fixed to the guide rod. The flywheel assembly comprises a main flywheel and a secondary flywheel connected to the main flywheel. The main flywheel is fixed integrally with the screw nut and bolted to the connecting sleeve. Magnetorheological fluid is provided at the contact surface between the main flywheel and the secondary flywheel. An excitation coil is provided on the outer sleeve. Compared with existing technologies, the present invention has the advantages of enabling real-time, continuous, and precise adjustment of the inertia coefficient of the inertia container.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction and isolation, in particular to a flywheel type magnetorheological inertia device with continuously adjustable inertia coefficient and an assembly method thereof. Background Art

[0002] In recent years, with the advancement of global urbanization, high-rise and super-high-rise buildings and long-span structures have emerged in large numbers. Structural performance control in high-intensity earthquake and typhoon zones has attracted widespread attention. Tuned mass dampers (TMDs), as simple and adaptable vibration control devices, have been successfully applied in engineering practice. However, their superior performance often relies on a large mass, resulting in poor tuning of high-order modes. Furthermore, the control robustness and reliability of large-mass TMD systems under nonstationary random excitations are reduced. To achieve mass reduction in TMD systems, some researchers have proposed introducing inertial vessels into TMD systems, forming TMDI (Tuned Mass Damper Interer) systems. This system utilizes the inertial amplification effect of the inertial vessel to reduce the mass of the TMD system while simultaneously increasing the tuning bandwidth of the TMD system. However, the performance of TMDI systems depends on the acceleration difference across the inertial vessel and is affected by the inertial vessel's grounding condition. In practice, grounding inertial vessels is difficult to achieve, severely limiting the application of TMDI systems. In order to solve the contradiction between the TMDI system's inability to be grounded and the need to generate huge inertial force, a feasible solution is to use the adjustable inertia coefficient mechanism to solve it.

[0003] In the prior art, inertia vessels with adjustable inertia coefficient can be divided into two categories: one is a mechanically adjustable inertia coefficient inertia vessel, such as the ball screw inertia vessel with a mechanically variable inertia coefficient disclosed in Chinese patent CN104401195B; the other is an actively adjustable inertia coefficient inertia vessel, such as the actively controlled inertia vessel disclosed in Chinese patent CN105546037B. The former adjusts the inertia coefficient of the inertia vessel relatively slowly and cannot achieve real-time continuous adjustment. Although the latter can achieve real-time adjustment of the inertia coefficient, it has a complex structure and requires a large amount of energy input. Neither type can achieve the effect of real-time, continuous and precise control of the inertia coefficient with a small energy input. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a flywheel type magnetorheological inertia device with continuously adjustable inertia coefficient and an assembly method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A flywheel-type magnetorheological fluid inertia device with a continuously adjustable inertia coefficient comprises an upper cover, a lower cover, and an outer sleeve. The upper, lower, and outer sleeves are connected to form an internal cavity, which contains a flywheel assembly, a ball screw, and a screw nut. Both the upper and lower covers have through-center holes, including one in the upper cover and one in the lower cover. A guide rod is fixed in the through-center hole of the lower cover. A connecting sleeve is inserted through the center hole of the upper cover. The ball screw extends through the connecting sleeve and the lower cover and is inserted into the screw nut, and is fixed integrally with the guide rod, and is configured to drive the flywheel assembly and the connecting sleeve to rotate through up and down movement. The flywheel assembly comprises a primary flywheel and a secondary flywheel connected to the primary flywheel. The primary flywheel is fixed integrally with the screw nut and bolted to the connecting sleeve. Magnetorheological fluid is provided at the contact surface between the primary and secondary flywheels. An excitation coil is provided on the outer sleeve for changing the viscosity of the magnetorheological fluid by applying electricity, thereby achieving real-time, continuous, and precise adjustment of the inertia coefficient of the inertia container.

[0007] Furthermore, the main flywheel includes a main flywheel cylinder; the main flywheel connecting rod is connected to the main flywheel cylinder; the main flywheel connecting rod is connected to the main flywheel ring wall through bolts; the main flywheel cylinder and the screw nut are fixed as a whole; the main flywheel ring wall and the connecting sleeve are connected through bolts.

[0008] Furthermore, the auxiliary flywheel has a through hole in the radial direction; the auxiliary flywheel passes through the main flywheel connecting rod through the through hole and is connected to the main flywheel. When rotating, it slides along the main flywheel connecting rod toward the outer sleeve due to the centrifugal force.

[0009] Furthermore, a first rolling bearing is provided on the inner side of the connecting sleeve and the upper cover to prevent friction between the connecting sleeve and the upper cover when the connecting sleeve rotates; a second rolling bearing is provided between the main flywheel cylinder and the lower cover to prevent friction between the main flywheel and the lower cover when the main flywheel rotates.

[0010] Furthermore, the contact walls between the auxiliary flywheel and the outer side of the main flywheel and the inner side of the outer sleeve are respectively provided with auxiliary flywheel inner side friction material and auxiliary flywheel outer side friction material, which are used to reduce the collision friction between the auxiliary flywheel and the contact walls between the outer side of the main flywheel and the inner side of the outer sleeve when the auxiliary flywheel slides along the main flywheel connecting rod.

[0011] Furthermore, a first groove is radially provided on the outer sleeve; the first groove is provided at the same horizontal plane as the magnetorheological fluid; and the excitation coil is installed in the first groove.

[0012] Furthermore, a second groove is axially provided at the through hole of the secondary flywheel; the magnetorheological fluid is encapsulated in the second groove; and a dynamic seal is provided around the second groove for sealing the magnetorheological fluid.

[0013] Furthermore, the main flywheel connecting rod is provided with an inward slope of 5 degrees, so that the auxiliary flywheel can slide and reset along the slope.

[0014] Furthermore, the interfaces where the upper cover, lower cover and outer sleeve are connected are stepped and fixed by bolts; the upper cover, lower cover and outer sleeve are all made of non-magnetic materials.

[0015] A method for assembling the flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient, the method comprising the following steps:

[0016] 1) Insert the ball screw into the inner wall of the screw nut through the ball to assemble the ball screw spiral pair;

[0017] 2) Pass the main flywheel cylinder and the main flywheel connecting rod through the ball screw and the screw nut and fix them on the screw nut; place the auxiliary flywheel on the main flywheel connecting rod through the through hole, encapsulate the magnetorheological fluid in the second groove, and set a dynamic seal around the second groove; connect the main flywheel ring wall to the main flywheel connecting rod with bolts to complete the assembly of the flywheel assembly;

[0018] 3) Pass the connecting sleeve through the upper end of the ball screw and connect it to the nut of the screw nut through the stepped opening; fix the edge of the connecting sleeve to the main flywheel ring wall with bolts;

[0019] 4) Install the first rolling bearing through the upper end of the ball screw and on the outside of the connecting sleeve; install the second rolling bearing through the lower end of the ball screw and on the outside of the main flywheel cylinder;

[0020] 5) Fix the guide rod and the lower end of the ball screw into one piece;

[0021] 6) Install the excitation coil in the first groove of the outer sleeve, combine the outer sleeve and the excitation coil with the assembled ball screw spiral pair and flywheel assembly, and place the excitation coil and the magnetorheological fluid on the same horizontal plane;

[0022] 7) Put the upper cover into the ball screw, and put the lower cover into the guide rod and the lower end of the main flywheel cylinder. Pay attention to the matching installation of the rolling bearing and the position of the upper and lower covers. Fix the upper and lower covers with the outer sleeve with bolts.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses the current in the excitation coil to control the shear viscosity of the magnetorheological fluid encapsulated at the contact surface between the primary and secondary flywheels, thereby controlling the distance between the secondary flywheel and the central axis of rotation. In other words, it controls the moment of inertia of the flywheel assembly, achieving real-time, continuous, and precise regulation of the inertia coefficient of the inertia container with minimal energy input and reduced magnetorheological fluid usage.

[0025] 2. The present invention does not require huge external energy input and external hydraulic cylinders. It only drives the main flywheel, auxiliary flywheel and sleeve to rotate through the rotation of its own ball screw. It has a simple structure, low cost and a wide range of applications.

[0026] 3. The present invention effectively prevents the magnetorheological fluid from leaking from the groove by providing a dynamic seal, thereby enhancing the stability, reliability and service life of the device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of the present invention, wherein A represents the position of the cross section of the flywheel assembly;

[0028] Figure 2 1 is a schematic cross-sectional view of the flywheel assembly AA of the present invention;

[0029] Figure 3 This is a schematic diagram of the built-in cavity of the present invention;

[0030] Figure 4 This is a schematic diagram of the main flywheel cylinder structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the main flywheel structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the auxiliary flywheel structure of the present invention;

[0033] Figure 7 Schematic diagram of the flywheel assembly structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the magnetorheological fluid packaging of the present invention.

[0035] The numbers in the figure indicate:

[0036] 1. Upper cover, 2. Lower cover, 3. Outer sleeve, 301. First groove, 4. Built-in cavity, 5. Flywheel assembly, 501. Main flywheel, 5011. Main flywheel cylinder, 5012. Main flywheel connecting rod, 5013. Main flywheel ring wall, 502. Auxiliary flywheel, 5021. Through hole, 5022. Second groove, 5023. Dynamic seal, 6. Ball screw, 7. Screw nut, 8. Excitation coil, 9. Magnetorheological fluid, 1001. First rolling bearing, 1002. Second rolling bearing, 11. Connecting sleeve, 12. Guide rod, 1301. Center hole through the upper cover, 1302. Center hole through the lower cover, 1401. Friction material on the inside of the auxiliary flywheel, 1402. Friction material on the outside of the auxiliary flywheel. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0038] Example

[0039] like Figures 1 to 8 As shown, a flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient includes an upper cover 1, a lower cover 2 and an outer sleeve 3; the upper cover 1, the lower cover 2 and the outer sleeve 3 are connected to form a built-in cavity 4, and the interface where the upper cover 1, the lower cover 2 and the outer sleeve 3 are connected is a stepped butt joint and is fixed by bolts to achieve stability during the operation of the inertia device; the upper cover 1, the lower cover 2 and the outer sleeve 3 are all made of non-magnetic conductive materials to ensure that the magnetic circuit is effective; the built-in cavity 4 includes a flywheel group 5, a ball screw 6 and a screw nut 7; the upper cover 1 and the lower cover 2 are both provided with a through center hole, including a through center hole 1301 of the upper cover and a through center hole 130 of the lower cover. 2; a guide rod 12 is fixed in the center hole 1302 passing through the lower cover; a connecting sleeve 11 is inserted into the center hole 1301 passing through the upper cover; the ball screw 6 passes through the connecting sleeve 11 and the center hole 1302 passing through the lower cover and is inserted into the inside of the screw nut 7, and is fixed as a whole with the guide rod 12, and is used to drive the flywheel group 5 and the connecting sleeve 11 to rotate by moving up and down; a first rolling bearing 1001 is provided on the inner side surface of the connecting sleeve 11 and the upper cover 1, which is used to prevent friction between the connecting sleeve 11 and the upper cover 1 when rotating; the inner side of the connecting sleeve 11 is provided with a thread adapted to the ball screw 6, which rotates in conjunction with the up and down movement of the ball screw 6.

[0040] The flywheel assembly 5 includes a main flywheel 501 and a secondary flywheel 502 connected to the main flywheel 501; the main flywheel 501 is fixed to the lead screw nut 7 as a whole and is connected to the connecting sleeve 11 by bolts; a magnetorheological fluid 9 is provided at the contact surface of the main flywheel 501 and the secondary flywheel 502; a first groove 301 is radially provided on the outer sleeve 3; the first groove 301 is arranged at the same horizontal plane as the magnetorheological fluid 9, and an excitation coil 8 is installed in the first groove 301 for changing the viscosity of the magnetorheological fluid 9 by energizing, thereby realizing real-time continuous and precise adjustment of the inertia coefficient of the inertia container; the main flywheel 501 includes a main flywheel cylinder 5011; the main flywheel The wheel cylinder 5011 is connected to the main flywheel connecting rod 5012, and the main flywheel connecting rod 5012 is provided with a slope of 5 degrees inward, which is used for the auxiliary flywheel 502 to slide and reset along the slope of the main flywheel connecting rod 5012 when the linear motion of the ball screw 6 is terminated and the current of the excitation coil 8 stops being applied; the main flywheel connecting rod 5012 is connected to the main flywheel annular wall 5013 by bolts; the main flywheel cylinder 5011 is fixed as a whole with the screw nut 7; the main flywheel annular wall 5013 is connected to the connecting sleeve 11 by bolts; a second rolling bearing 1002 is provided between the main flywheel cylinder 5011 and the lower cover 2, which is used to prevent friction between the main flywheel 501 and the lower cover 2 when the main flywheel 501 rotates.

[0041] The auxiliary flywheel 502 is provided with a through hole 5021 in the radial direction; the auxiliary flywheel 502 passes through the main flywheel connecting rod 5012 through the through hole 5021 and is connected to the main flywheel 501. When rotating, it slides along the main flywheel connecting rod 5012 toward the outer sleeve 3 due to the centrifugal force; the contact wall surfaces between the auxiliary flywheel 502 and the outer side of the main flywheel 501 and the inner side of the outer sleeve 3 are respectively provided with an auxiliary flywheel inner friction material 1401 and an auxiliary flywheel outer friction material 1402, which are used to reduce the friction between the auxiliary flywheel 502 and the main flywheel 501. As the primary flywheel connecting rod 5012 slides, it collides and rubs against the contact surfaces of the outer surface of the primary flywheel 501 and the inner surface of the outer sleeve 3. A second groove 5022 is axially defined in the through-hole 5021 of the secondary flywheel 502. The magnetorheological fluid 9 is encapsulated within the second groove 5022. A dynamic seal 5023 is provided around the second groove 5022 to seal the magnetorheological fluid 9 and effectively prevent leakage from the second groove 5022, thereby enhancing the stability, reliability, and service life of the present invention. When the device of the present invention controls horizontal motion, a specialized linkage mechanism can be provided to convert it into vertical motion.

[0042] The operating principle of the present invention is as follows: the ball screw 6 undergoes linear motion, driving the lead screw nut 7 to rotate, which in turn drives the primary flywheel 501 to rotate, which in turn drives the connecting sleeve 11 and the secondary flywheel 502 to rotate. Due to centrifugal force, the secondary flywheel 502 simultaneously slides along the primary flywheel connecting rod 5012 toward the outer sleeve 3, shearing the magnetorheological fluid 9 encapsulated in the second groove 5022. When no current is applied to the magnetic excitation coil 8, the magnetorheological fluid 9 is a low-viscosity Newtonian fluid, and the secondary flywheel 502 slides along the primary flywheel connecting rod 5012 with low friction, providing a high inertia coefficient. When current is applied to the excitation coil 8, the shear viscosity of the magnetorheological fluid 9 between the secondary flywheel 502 and the primary flywheel connecting rod 5012 changes, causing the secondary flywheel 502 to slide along the primary flywheel connecting rod 5012 with variable friction. The position of the secondary flywheel 502 sliding along the primary flywheel connecting rod 5012 is adjusted by the current in the excitation coil 8, which is controlled in real time by the shear viscosity of the magnetorheological fluid 9. As the current increases, the shear viscosity increases, and the secondary flywheel 502 moves closer to the primary flywheel 501, decreasing the volume inertia. As the current decreases, the shear viscosity decreases, and the secondary flywheel 502 moves further away from the primary flywheel 501, increasing the volume inertia.

[0043] A method for assembling the flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient comprises the following steps:

[0044] 1) Insert the ball screw 6 into the inner wall of the screw nut 7 through the ball to assemble the ball screw helical pair;

[0045] 2) Pass the primary flywheel cylinder 5011 and the primary flywheel connecting rod 5012 through the ball screw 6 and the screw nut 7 and fix them on the screw nut 7; place the secondary flywheel 502 on the primary flywheel connecting rod 5012 through the through hole 5021, encapsulate the magnetorheological fluid 9 in the second groove 5022, and set a dynamic seal 5023 around the second groove 5022; connect the primary flywheel annular wall 5013 to the primary flywheel connecting rod 5012 with bolts, completing the assembly of the flywheel assembly 5;

[0046] 3) Pass the connecting sleeve 11 through the upper end of the ball screw 6 and connect it to the nut of the screw nut 7 through the stepped opening; fix the edge of the connecting sleeve 11 to the main flywheel ring wall 5013 with bolts;

[0047] 4) Install the first rolling bearing 1001 through the upper end of the ball screw 6 and on the outside of the connecting sleeve 11; install the second rolling bearing 1002 through the lower end of the ball screw 6 and on the outside of the main flywheel cylinder 5011;

[0048] 5) Fix the guide rod 12 and the lower end of the ball screw 6 into one piece;

[0049] 6) Install the excitation coil 8 in the first groove 301 of the outer sleeve 3, combine the outer sleeve 3 and the excitation coil 8 with the assembled ball screw spiral pair and flywheel assembly 5, and place the excitation coil 8 and the magnetorheological fluid 9 on the same horizontal plane;

[0050] 7) Insert the upper cover 1 into the ball screw 6, insert the lower cover 2 into the guide rod 12 and the lower end of the main flywheel cylinder 5011, and pay attention to the matching installation of the rolling bearing 10 with the upper cover 1 and the lower cover 2. Fix the upper cover 1, the lower cover 2 and the outer sleeve 3 together with bolts.

[0051] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A flywheel-type magnetorheological inertia device with a continuously adjustable inertia coefficient, comprising an upper cover (1), a lower cover (2) and an outer sleeve (3); the upper cover (1), the lower cover (2) and the outer sleeve (3) are connected to form a built-in cavity (4), characterized in that: The built-in cavity (4) includes a flywheel assembly (5), a ball screw (6) and a screw nut (7); the upper cover (1) and the lower cover (2) are both provided with a through-center hole, including an upper cover through-center hole (1301) and a lower cover through-center hole (1302); a guide rod (12) is fixed in the lower cover through-center hole (1302); a connecting sleeve (11) is inserted into the upper cover through-center hole (1301); the ball screw (6) penetrates the connecting sleeve (11) and the lower cover through-center hole (1302) and is inserted into the screw nut (7), and is fixed as a whole with the guide rod (12). Used to drive the flywheel assembly (5) and the connecting sleeve (11) to rotate by moving up and down; the flywheel assembly (5) includes a main flywheel (501) and a secondary flywheel (502) connected to the main flywheel (501); the main flywheel (501) is fixed as a whole with the screw nut (7) and is connected to the connecting sleeve (11) by bolts; a magnetorheological fluid (9) is provided at the contact surface of the main flywheel (501) and the secondary flywheel (502); an excitation coil (8) is provided on the outer sleeve (3) for changing the viscosity of the magnetorheological fluid (9) by energizing, thereby realizing real-time continuous and precise adjustment of the inertia coefficient of the inertia container; The main flywheel (501) comprises a main flywheel cylinder (5011); a main flywheel connecting rod (5012) is connected to the main flywheel cylinder (5011); The auxiliary flywheel (502) is provided with a through hole (5021) in the radial direction; the auxiliary flywheel (502) passes through the main flywheel connecting rod (5012) through the through hole (5021) and is connected to the main flywheel (501). When rotating, the auxiliary flywheel (502) slides along the main flywheel connecting rod (5012) toward the outer sleeve (3) due to the centrifugal force.

2. A flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 1, characterized in that: The main flywheel connecting rod (5012) is connected to the main flywheel ring wall (5013) via bolts; the main flywheel cylinder (5011) and the lead screw nut (7) are fixed as a whole; and the main flywheel ring wall (5013) and the connecting sleeve (11) are connected via bolts.

3. The flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 1, characterized in that: A first rolling bearing (1001) is provided on the inner side surfaces of the connecting sleeve (11) and the upper cover (1), for preventing friction between the connecting sleeve (11) and the upper cover (1) when the connecting sleeve (11) rotates; a second rolling bearing (1002) is provided between the main flywheel cylinder (5011) and the lower cover (2), for preventing friction between the main flywheel (501) and the lower cover (2) when the main flywheel (501) rotates.

4. A flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 3, characterized in that: The contact surfaces of the auxiliary flywheel (502) with the outer side of the main flywheel (501) and the inner side of the outer sleeve (3) are respectively provided with auxiliary flywheel inner side friction material (1401) and auxiliary flywheel outer side friction material (1402), which are used to reduce the collision friction between the auxiliary flywheel (502) and the contact surfaces of the outer side of the main flywheel (501) and the inner side of the outer sleeve (3) when the auxiliary flywheel (502) slides along the main flywheel connecting rod (5012).

5. A flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 4, characterized in that: A first groove (301) is radially provided on the outer sleeve (3); the first groove (301) is provided on the same horizontal plane as the magnetorheological fluid (9); and the excitation coil (8) is installed in the first groove (301).

6. A flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 5, characterized in that: A second groove (5022) is axially provided at the through hole (5021) of the secondary flywheel (502); the magnetorheological fluid (9) is encapsulated in the second groove (5022); and a dynamic seal (5023) is provided around the second groove (5022) for sealing the magnetorheological fluid (9).

7. A flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 6, characterized in that: The main flywheel connecting rod (5012) is provided with an inward slope of 5 degrees, so that the auxiliary flywheel (502) can slide and reset along the slope.

8. The flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 7, characterized in that: The interfaces where the upper cover (1), the lower cover (2) and the outer sleeve (3) are connected are stepped butt joints and are fixed by bolts; the upper cover (1), the lower cover (2) and the outer sleeve (3) are all made of non-magnetic materials.

9. A method for assembling the flywheel-type magnetorheological inertia device with continuously adjustable inertia coefficient according to claim 7, characterized in that: The method comprises the following steps: 1) Insert the ball screw (6) into the inner wall of the screw nut (7) through the ball to assemble the ball screw helical pair; 2) The main flywheel cylinder (5011) and the main flywheel connecting rod (5012) are passed through the ball screw (6) and the screw nut (7) and fixed on the screw nut (7); the auxiliary flywheel (502) is placed on the main flywheel connecting rod (5012) through the through hole (5021), and the magnetorheological fluid (9) is encapsulated in the second groove (5022), and a dynamic seal (5023) is provided around the second groove (5022); the main flywheel ring wall (5013) is connected to the main flywheel connecting rod (5012) by bolts, and the assembly of the flywheel group (5) is completed; 3) Pass the connecting sleeve (11) through the upper end of the ball screw (6) and connect it to the nut of the screw nut (7) through the stepped opening; fix the edge of the connecting sleeve (11) to the main flywheel ring wall (5013) with bolts; 4) Install the first rolling bearing (1001) on the outside of the connecting sleeve (11) through the upper end of the ball screw (6); install the second rolling bearing (1002) on the outside of the main flywheel cylinder (5011) through the lower end of the ball screw (6); 5) Fix the guide rod (12) and the lower end of the ball screw (6) into one piece; 6) Installing the excitation coil (8) in the first groove (301) of the outer sleeve (3), combining the outer sleeve (3) and the excitation coil (8) with the assembled ball screw spiral pair and flywheel assembly (5), and placing the excitation coil (8) and the magnetorheological fluid (9) on the same horizontal plane; 7) Insert the upper cover (1) into the ball screw (6), insert the lower cover (2) into the guide rod (12) and the lower end of the main flywheel cylinder (5011), and pay attention to the matching installation of the rolling bearing (10) and the position of the upper cover (1) and the lower cover (2). Fix the upper cover (1), the lower cover (2) and the outer sleeve (3) together by bolts.

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