A dual moving-coil variable-stiffness electromagnetic damper

Abstract

This invention relates to a dual-moving-coil variable stiffness electromagnetic vibration damper, comprising three components: a vibrator body, a support housing, and a variable stiffness device. The vibrator body includes a hollow push rod, a hollow push rod seat, upper and lower leaf springs, upper and lower coil supports, upper and lower circulating heat pipes, upper and lower permanent magnets, coils, and a magnetic yoke; the support housing includes an engine connector, an upper support housing, a lower support housing, and a support base; the variable stiffness device includes a disc motor, a cylindrical convex ratchet, a direct-acting follower, and a working pawl. The circulating heat pipe is embedded in the upper and lower coil supports to transfer the heat generated by the coil to the hollow push rod more quickly. Secondly, the heat of the vibrator can also be reduced by the heat sink of the supporting shell. The moving coil structure, hollow push rod seat (weight reduction), and hollow push rod (weight reduction) effectively solve the problem of excessive mass of the moving part. The double-layer coil structure can greatly reduce magnetic leakage, achieve a larger number of coil turns in a limited space, and improve its output power and output force. The cylindrical convex ratchet can convert the rotational motion of the disc motor into the vertical linear motion of the direct-acting follower. The working pawl cooperates to fix the position of the direct-acting follower and control the distance between the direct-acting follower and the lower plate spring (when the disc motor stops moving), thereby controlling the deformation of the lower plate spring to control the working stiffness of the electromagnetic vibration damper.

Description

Technical Field

[0001] This invention relates to the field of automotive chassis components technology, and in particular to a dual-moving-coil variable stiffness electromagnetic damper. Background Technology

[0002] The engine is the power source of a car, and the vibrations and noise it generates are transmitted to the vehicle body, affecting ride comfort and driving stability. To reduce this impact, active suspension technology was developed. Active suspension systems reduce vibrations and noise transmitted to the vehicle interior by adjusting the engine's position and vibration, thus improving ride comfort and driving stability. The active suspension vibrator is the core component of the active suspension system, used to adjust the engine's position and vibration. Electromagnetic actuators are further divided into three types: moving iron, moving coil, and moving magnet.

[0003] A moving-coil vibrator is essentially an electromagnetic device, working similarly to the moving coil in a loudspeaker. It uses electromagnetic force to directly drive components of the suspension system, achieving rapid and precise suspension adjustments. Compared to traditional hydraulic or pneumatic vibrators, moving-coil vibrators offer faster response times, higher control precision, and more refined suspension adjustments. They generate force through electromagnetic induction to achieve mechanical motion. However, currently, their internal stiffness is generally not adjustable, limiting their ability to better adapt to different driving conditions and vehicle requirements, and thus hindering improvements in vehicle performance and comfort.

[0004] Existing technologies have the following problems: 1. The moving-coil electromagnetic vibrator has a large mover mass, resulting in poor vibration damping performance at high frequencies. 2. The output force of the moving-coil electromagnetic vibrator is relatively small, and there is a small amount of magnetic leakage. 3. The moving-coil electromagnetic vibrator has limited heat dissipation capacity, and the heat from the internal heat source coil cannot be quickly and directly dissipated. 4. The internal stiffness of the electromagnetic vibrator cannot be adjusted, making it unable to better adapt to different driving conditions and vehicle requirements. Based on the above problems, this invention proposes a dual-moving-coil variable stiffness electromagnetic vibration damper. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-moving-coil variable stiffness electromagnetic vibration damper to solve the following problems existing in current vibrators:

[0006] (1) The mass of the mover is too large, which leads to poor high-frequency vibration reduction effect of the active suspension;

[0007] (2) The output force is too small and there is magnetic leakage.

[0008] (3) The problem that the heat from the heating coil inside the vibrator cannot be dissipated smoothly;

[0009] (4) The internal stiffness of the electromagnetic vibrator cannot be adjusted, making it unable to adapt to different driving conditions and vehicle requirements.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A dual-moving-coil variable stiffness electromagnetic vibration damper includes a vibrator body, a support shell, and a variable stiffness device.

[0012] The vibrator body includes a hollow push rod, an upper coil support, a lower coil support, an upper permanent magnet, a lower permanent magnet, a coil, and a magnetic yoke;

[0013] The inner side of the magnetic yoke is provided with upper and lower grooves, and the upper permanent magnet and the lower permanent magnet are respectively fixed in the upper and lower grooves on the inner side of the magnetic yoke to form a stator;

[0014] The coil is wound on the upper coil support and the lower coil support, and cooperates with the hollow push rod to form a mover, thus forming a moving coil structure.

[0015] The support housing includes an engine connector, an upper support housing, a lower support housing, and a support base;

[0016] The engine connector is threaded to the top of the hollow push rod;

[0017] The upper support housing is installed outside the upper leaf spring and magnetic yoke by an interference fit.

[0018] The support base is installed on the outside of the lower leaf spring and the magnetic yoke by means of an interference fit;

[0019] The lower support housing is installed outside the upper support housing through an transition fit, and is connected to the support base by bolts and nuts, and then fixedly connected to the upper support housing by welding through the holes on it.

[0020] The variable stiffness device includes a disc motor, a cylindrical ratchet wheel, a direct-acting follower, and a working pawl.

[0021] The disc motor includes a hollow rotor, an upper bearing, a lower bearing, a permanent magnet, a motor coil, an upper housing, and a lower housing of the coil frame. The hollow rotor has a hollow structure.

[0022] The direct-acting driven component includes a pulley and a pulley bolt. The pulley bolt is fixed to the direct-acting driven component by a threaded connection, and the pulley and the pulley bolt are connected by an interference fit.

[0023] The disc motor is fixed to the support base with screws, and the hollow rotor in the disc motor is connected and fixed to the cylindrical convex ratchet through an external spline.

[0024] The cylindrical ratchet is connected to the pulley on the linear driven member through a groove;

[0025] The linear driven member engages with the linear groove of the support base via a pulley;

[0026] The working pawl is fixed to the bottom of the straight groove of the support base and contacts the ratchet structure at the bottom of the cylindrical convex ratchet.

[0027] Preferably, the vibrator body further includes a hollow push rod seat, an upper leaf spring, and a lower leaf spring. The upper leaf spring and the upper coil support are installed above the hollow push rod by an interference fit. The hollow push rod is installed in the magnetic yoke, so that the upper coil support is located in the upper concave part of the magnetic yoke. The lower leaf spring and the lower coil support are installed below the hollow push rod by an interference fit and a threaded connection between the hollow push rod seat and the hollow push rod, so that the lower coil support is located in the lower concave part of the magnetic yoke, forming a double-layer coil structure.

[0028] Preferably, the vibrator body further includes an upper circulating heat pipe and a lower circulating heat pipe, which are respectively embedded inside the injection-molded upper coil bracket and the lower coil bracket.

[0029] Preferably, the hollow push rod is made of aluminum alloy, and its shaft is hollowed out to reduce weight.

[0030] Preferably, the upper coil support and the lower coil support are provided with reinforcing ribs at their top ends. The upper coil support is transitionally fitted with the hollow push rod. At the upper end of the rod tip, the lower coil support is transitionally fitted with the hollow push rod. At the lower end of the rod tip, the roots of the upper coil support and the lower coil support are in direct contact.

[0031] Preferably, both the upper and lower support shells are made of aluminum alloy and have heat dissipation fins fixedly connected to their exteriors.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] (1) This invention proposes a dual-moving coil type variable stiffness electromagnetic vibration damper, which adopts a double-layer coil structure, which can greatly reduce the leakage magnetic phenomenon, realize a larger number of coil turns in a limited space, and improve its output power and output force value.

[0034] (2) The moving coil structure proposed in this invention and the hollow structure of the vibrator push rod can reduce the weight of the push rod while maintaining sufficient rigidity and strength while increasing the outer diameter, effectively solving the problem of excessive mass of the mover.

[0035] (3) The present invention uses a circulating heat pipe structure embedded in the grooves inside the upper and lower coil supports, which can effectively transfer the heat of the coil to the hollow push rod made of aluminum alloy; there are also heat dissipation fins on the outside of the support shell, which can effectively dissipate the heat of the vibrator.

[0036] (4) The improved disc motor rotor part of the present invention is a hollow shaft that works with the push rod in the actuator but does not contact it, saving space and allowing the actuator push rod to transmit pressure to the support base instead of the disc motor.

[0037] (5) The cylindrical ratchet designed in this invention can change the rotational motion of the disc motor into the up-down linear motion of the linear follower. The working pawl cooperates to fix the position of the linear follower (when the disc motor stops moving), thereby controlling the deformation of the lower spring to control the working stiffness of the electromagnetic damper. Attached Figure Description

[0038] Figure 1 This is a schematic cross-sectional view of a dual-moving-coil variable stiffness electromagnetic vibration damper proposed in this invention.

[0039] Figure 2 This is an exploded view of the supporting shell structure proposed in this invention;

[0040] Figure 3 This is an exploded view of the structure of the vibrator body proposed in this invention;

[0041] Figure 4 This is an exploded view of the variable stiffness device structure proposed in this invention;

[0042] Figure 5 This is a schematic diagram of the upper coil support structure proposed in this invention;

[0043] Figure 6 This is a schematic diagram of the lower coil support structure proposed in this invention;

[0044] Figure 7 This is a schematic diagram of the hollow push rod structure proposed in this invention;

[0045] Figure 8 This is a schematic diagram of the upper circulation heat pipe structure proposed in this invention;

[0046] Figure 9 This is a schematic diagram of the lower circulation heat pipe structure proposed in this invention;

[0047] Figure 10 This is a schematic diagram of the cylindrical convex ratchet structure proposed in this invention.

[0048] In the above figures, the objects identified by each of the figure numbers are:

[0049] 1. Engine connector; 2. Hollow push rod; 3. Upper leaf spring; 4. Upper coil bracket; 5. Upper circulating heat pipe; 6. Upper permanent magnet; 7. Magnetic yoke; 8. Lower coil bracket; 9. Lower circulating heat pipe; 10. Lower leaf spring; 11. Upper support housing; 12. Coil; 13. Lower permanent magnet; 14. Lower support housing; 15. Support base; 16. Hollow push rod seat; 17. Pulley; 18. Pulley bolt; 19. Direct-acting follower; 20. Cylindrical convex ratchet; 21. Disc motor; 22. Hollow rotor; 23. Lower bearing; 24. Upper bearing; 25. Motor coil; 26. Permanent magnet; 27. Upper housing; 28. Lower housing of coil frame; 29. ​​Working pawl. Detailed Implementation

[0050] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description of an embodiment of the invention is provided below. It should be particularly noted that the specific implementation of this invention is not limited to the forms described in the embodiments.

[0051] Example 1:

[0052] Please see Figure 1-10 This invention provides a dual-moving-coil variable stiffness electromagnetic vibration damper, comprising a vibrator body, a support housing, and a variable stiffness device.

[0053] The vibrator body includes a hollow push rod 2, a hollow push rod seat 16, an upper leaf spring 3, a lower leaf spring 10, an upper coil support 4, a lower coil support 8, an upper circulating heat pipe 5, a lower circulating heat pipe 9, an upper permanent magnet 6, a lower permanent magnet 13, a coil 12, and a magnetic yoke 7. The magnetic yoke 7 has upper and lower grooves on its inner side. The upper permanent magnet 6 and the lower permanent magnet 13 are respectively fixed in the upper and lower grooves on the inner side of the magnetic yoke 7 to form a stator. The coil 12 is wound on the upper coil support 4 and the lower coil support 8 and cooperates with the hollow push rod 2 to form a mover, thus constituting a moving coil structure. The upper leaf spring 3 and the upper coil support 4 are mounted above the hollow push rod 2 via an interference fit. The hollow push rod 2 is installed in the magnetic yoke 7, so that the upper coil support 4 is located in the concave part of the magnetic yoke 7. The lower leaf spring 10 and the lower coil support 8 are mounted below the hollow push rod 2 via an interference fit and a threaded connection between the hollow push rod seat 16 and the hollow push rod 2, so that the lower coil support 8 is located in the concave part of the magnetic yoke 7, forming a double-layer coil structure. The upper circulating heat pipe 5 and the lower circulating heat pipe 9 are embedded inside the upper coil support 4 and the lower coil support 8, respectively.

[0054] The support housing includes an engine connector 1, an upper support housing 11, a lower support housing 14, and a support base 15. The engine connector 1 is threaded to the top of the hollow push rod 2. The upper support housing 11 is mounted on the outside of the upper leaf spring 3 and the magnetic yoke 7 with an interference fit. The support base 15 is mounted on the outside of the lower leaf spring 10 and the magnetic yoke 7 with an interference fit. The lower support housing 14 is mounted on the outside of the upper support housing 11 with an transition fit, and is connected to the support base 15 with bolts and nuts, and then fixedly connected to the upper support housing 11 by welding through its holes.

[0055] The variable stiffness device includes a disc motor 21, a cylindrical ratchet 20, a direct-acting follower 19, and a working pawl 29. The disc motor 21 includes a hollow rotor 22, an upper bearing 24, a lower bearing 23, a permanent magnet 26, a motor coil 25, an upper housing 27, and a lower housing 28 for the coil frame, wherein the hollow rotor 22 has a hollow structure. The direct-acting follower 19 includes a pulley 17 and a pulley bolt 18. The pulley bolt 18 is fixed to the direct-acting follower 19 by a threaded connection, and the pulley 17 and pulley bolt 18 are connected by an interference fit. The disc motor 21 is fixed to the support base 15 by screws, and the hollow rotor 22 in the disc motor 21 is connected and fixed to the cylindrical ratchet 20 by an external spline. The cylindrical ratchet 20 is connected to the pulley 17 on the direct-acting follower 19 by a groove. The direct-acting follower 19 is connected to the linear groove of the support base 15 by the pulley 17. The working pawl 29 is fixed at the bottom of the straight groove of the support base 15 and contacts the ratchet structure at the bottom of the cylindrical convex ratchet 20.

[0056] With the engine active suspension system of this invention, the classic operation process of the electromagnetic damper for adjusting engine vibration during vehicle operation is as follows:

[0057] like Figure 1 As shown, Figure 1As shown, a constant magnetic field is formed by the upper permanent magnet 6 and the lower permanent magnet 13. When the coil 12 is energized by AC, the mover consisting of the upper coil support 4 and the lower coil support 8 wound around the coil 12, and the hollow push rod 2 that cooperates with them, will move up and down axially. The excitation force generated can neutralize the vibration generated by the engine, thereby achieving an active vibration reduction effect. When it is necessary to adjust the internal stiffness of the electromagnetic vibration damper, the disc motor 21 fixed on the support base 15 starts to work and rotates, thereby driving the cylindrical convex ratchet 20 connected to the rotor spline to rotate. On the one hand, the cylindrical convex ratchet 20 cooperates with the internal pulley 17 of the direct-acting follower 19 through the curved groove on the cylindrical surface, and the straight groove on the support base 15 cooperates with the external pulley 17 of the direct-acting follower 19, thereby changing the rotational motion of the disc motor 21 into the regular up and down linear motion of the direct-acting follower 19. On the other hand, the ratchet structure at the bottom of the cylindrical convex ratchet 20, in the cylindrical convex ratchet 2 During counterclockwise rotation, the device operates normally. When the direct-acting follower 19 moves to the appropriate position, i.e., when the direct-acting follower 19 applies pressure, the internal pulley 17 is positioned within the curved groove on the cylindrical surface of the cylindrical convex ratchet 20, causing the cylindrical convex ratchet 20 to rotate clockwise. At this point, the working pawl 29 engages, locking the ratchet and preventing it from rotating clockwise, thereby fixing the position of the direct-acting follower 19 and controlling the distance between the direct-acting follower 19 and the lower leaf spring 10 (when the disc motor 21 stops moving). This, in turn, controls the deformation of the lower leaf spring 10, thereby controlling the working stiffness of the electromagnetic vibration damper.

[0058] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-moving-coil variable stiffness electromagnetic vibration damper, characterized in that, Includes the vibrator body, support housing, and variable stiffness device; The vibrator body includes a hollow push rod (2), an upper coil support (4), a lower coil support (8), an upper permanent magnet (6), a lower permanent magnet (13), a coil (12), and a magnetic yoke (7); The inner side of the magnetic yoke (7) is provided with upper and lower grooves, and the upper permanent magnet (6) and the lower permanent magnet (13) are respectively fixed in the upper and lower grooves on the inner side of the magnetic yoke (7) to form a stator; The coil (12) is wound on the upper coil support (4) and the lower coil support (8), and cooperates with the hollow push rod (2) to form a mover, thus forming a moving coil structure; The support housing includes an engine connector (1), an upper support housing (11), a lower support housing (14), and a support base (15). The engine connector (1) is threaded to the top of the hollow push rod (2); The upper support housing (11) is installed outside the upper leaf spring (3) and the magnetic yoke (7) by means of interference fit; The support base (15) is installed on the outside of the lower leaf spring (10) and the magnetic yoke (7) by means of interference fit; The lower support housing (14) is installed outside the upper support housing (11) by means of transition fit, and is connected to the support base (15) by bolts and nuts, and is then fixedly connected to the upper support housing (11) by welding through the hole on it; The variable stiffness device includes a disc motor (21), a cylindrical ratchet (20), a direct-acting follower (19), and a working pawl (29). The disc motor (21) includes a hollow rotor (22), an upper bearing (24), a lower bearing (23), a permanent magnet (26), a motor coil (25), an upper housing (27), and a lower housing (28) for the coil frame. The hollow rotor (22) has a hollow structure. The direct-acting follower (19) includes a pulley (17) and a pulley bolt (18). The pulley bolt (18) is fixed to the direct-acting follower (19) by a threaded connection. The pulley (17) and the pulley bolt (18) are connected by an interference fit. The disc motor (21) is fixed to the support base (15) by screws, and the hollow rotor (22) in the disc motor (21) is connected and fixed to the cylindrical convex ratchet (20) by external splines; The cylindrical ratchet (20) is connected to the pulley (17) on the linear follower (19) through a groove; The direct-acting follower (19) engages with the straight groove of the support base (15) via a pulley (17); The working pawl (29) is fixed to the bottom of the straight groove of the support base (15) and is in contact with the ratchet structure at the bottom of the cylindrical convex ratchet (20); By controlling the distance between the direct-acting follower (19) and the lower leaf spring (10), the deformation degree of the lower leaf spring (10) can be controlled, thereby achieving the purpose of controlling the working stiffness of the electromagnetic damper.

2. The dual-moving-coil variable stiffness electromagnetic vibration damper according to claim 1, characterized in that, The vibrator body also includes a hollow push rod seat (16), an upper spring (3), and a lower spring (10). The upper spring (3) and the upper coil bracket (4) are installed above the hollow push rod (2) by an interference fit. The hollow push rod (2) is installed in the magnetic yoke (7), so that the upper coil bracket (4) is located in the upper concave part of the magnetic yoke (7). The lower spring (10) and the lower coil bracket (8) are installed below the hollow push rod (2) by an interference fit and a threaded connection between the hollow push rod seat (16) and the hollow push rod (2), so that the lower coil bracket (8) is located in the lower concave part of the magnetic yoke (7), forming a double-layer coil structure.

3. The dual-moving-coil variable stiffness electromagnetic vibration damper according to claim 1, characterized in that, The vibrator body also includes an upper circulating heat pipe (5) and a lower circulating heat pipe (9), which are respectively embedded inside the upper coil support (4) and the lower coil support (8).

4. The dual-moving-coil variable stiffness electromagnetic vibration damper according to claim 1, characterized in that, The hollow push rod (2) is made of aluminum alloy, and its shaft is hollowed out to reduce weight.

5. A dual-moving-coil variable stiffness electromagnetic vibration damper according to claim 1, characterized in that, The upper coil support (4) and the lower coil support (8) are provided with reinforcing ribs at their top ends. The upper coil support (4) is transitionally fitted with the hollow push rod (2). At the upper end of the rod tip, the lower coil support (8) is transitionally fitted with the hollow push rod (2). At the lower end of the rod tip, the roots of the upper coil support (4) and the lower coil support (8) are in direct contact.

6. A dual-moving-coil variable stiffness electromagnetic vibration damper according to claim 1, characterized in that, Both the upper support shell (11) and the lower support shell (14) are made of aluminum alloy, and their outer surfaces are heat dissipation fin structures.

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