Eddy current type three-mass flywheel torsion damper

Abstract

The invention provides an eddy current type three-mass flywheel novel torsion damper and a control method. The eddy current type three-mass flywheel novel torsion damper comprises a first rotating inertia assembly, a second rotating inertia assembly, a third rotating inertia assembly and an eddy current damping unit (comprising an eddy current generating mechanism and an eddy current control mechanism). The third rotation inertia assembly and the eddy current generation mechanism are wrapped outside a secondary flywheel in the second rotation inertia assembly, and the eddy current control mechanism is located at the rightmost end of the whole device. By adjusting the on-off of an electromagnet in the eddy current control mechanism, the attraction of the electromagnet to a permanent magnet fixed on the pressing rod can be adjusted, and then the pressing of the permanent magnet to the pressing rod can be controlled. And when the electromagnet is temporarily electrified, the permanent magnet is attracted by the electromagnet and presses the pressing rod. When power is cut off, the attractive force disappears, the pressing rod is not pressed any more, gear shifting is completed while the pressing rod is pushed to the front end by the reset spring, and adjustable axial movement of the permanent magnet is achieved. Therefore, a control mechanism composed of the electromagnets controls air gaps of the multiple sets of magnets, the magnetic induction intensity and the eddy current damping torque are adjusted, and the adjustable vibration reduction effect is achieved. The invention has the advantages of compact structure, flexibility in operation, good vibration damping performance and the like.

Description

Technical Field

[0001] The present application relates to the technical field of torsional vibration reduction of power transmission systems, and in particular to a novel torsional vibration reduction mechanism and an operating method for an eddy current three-mass flywheel. Background Art

[0002] Torsional vibration in the vehicle powertrain has a significant impact on the life of the transmission system components, vehicle handling stability and ride comfort. Torsional vibration is generally reduced by installing a torsional vibration damper, but due to space constraints and the structure of the torsional vibration damper itself, the vibration reduction effect is often difficult to achieve an ideal state. As a more efficient vibration reduction method, the dual-mass flywheel can better meet the needs of torsional vibration reduction.

[0003] The dual-mass flywheel is an important component in the automotive powertrain system. It has the functions of transmitting engine torque and achieving vibration reduction. Its performance directly affects the noise, vibration and acoustic harshness performance of the entire powertrain. The dual-mass flywheel is mainly composed of the first mass, the second mass and the elastic element. The elastic element plays a major role in vibration reduction. Its material properties and structural dynamic characteristics have a key influence on the torsional vibration characteristics of the dual-mass flywheel.

[0004] Setting a torsional vibration damper in the vehicle power transmission system can reduce torsional vibration to a certain extent. The torsional vibration dampers currently used mainly include clutch driven disc torsional vibration damper, dual mass flywheel torsional vibration damper and Geislinger coupling. Although these passive torsional vibration dampers can reduce the torsional vibration of the torque transmission system to a certain extent, they also have to undertake the dual tasks of transmitting power torque and reducing fluctuating torque. Transmitting large power torque requires high torsional stiffness, while reducing fluctuating torque requires low torsional stiffness. There is an irreconcilable contradiction between the two, which makes the working frequency bandwidth of the passive torsional vibration damper narrow, making it difficult to achieve wide-band vibration reduction of the torque transmission system.

[0005] In view of this situation, semi-active and active torsional vibration dampers came into being. The active control force required by the active torsional vibration damper consumes a lot of energy and is not cost-effective. Although the existing semi-active torsional vibration damper has the advantages of both active and passive, it has a complex structure and the hydraulic components required for semi-active control are expensive, which is not conducive to engineering promotion.

[0006] Therefore, taking into account both vibration reduction effect and structural economy, developing new semi-active torsional vibration reduction devices and control technologies is a technical challenge that technical personnel in this field urgently need to overcome. Summary of the invention

[0007] In summary, one of the objectives of the present invention is to provide a novel torsional vibration damper of an eddy current three-mass flywheel. Specifically, a third rotational inertia component, an eddy current generating and operating mechanism are added between the first rotational inertia component and the second rotational inertia component of the dual-mass flywheel. After the vibration is initially weakened by the arc spring part in the first rotational inertia component, eddy currents can be generated between the second rotational inertia component and the third rotational inertia component by cutting the magnetic flux lines, thereby generating a damping force, thereby achieving further vibration reduction and achieving an ideal effect.

[0008] The first rotating inertia component is a dual-mass flywheel assembly, including a primary flywheel, a friction gasket, a connecting plate, a bearing, an arc spring, a cover, and rivets; the second rotating inertia component includes a secondary flywheel and an inertia plate. In addition to the function of a traditional flywheel, the secondary flywheel can also cut the magnetic flux lines generated by the permanent magnet, thereby generating eddy currents on the secondary flywheel M2 to act as an eddy current plate; the third rotating inertia component includes two inertia plates and two groups of circumferentially arranged permanent magnets. The permanent magnets are fixed to the inner wall of the inertia plate in the third rotating inertia component, and there is an air gap between the two groups of permanent magnets; the eddy current operating mechanism is composed of a second-gear pressing rod and an electromagnet, and is located at the rightmost end of the mechanism. The pressing rod in the operating mechanism has two gears, and the air gap of the permanent magnet can be adjusted by shifting the pressing rod. When the damping needs to be increased, the air gap of the permanent magnet needs to be reduced. At this time, the electromagnet in the operating mechanism only needs to be energized briefly. At the moment of energization, the permanent magnet fixed on the pressing rod is attracted by the electromagnet, and the permanent magnet pushes the slide bar in the pressing rod to the top of the pressing rod. At the same time, due to the interaction between the end of the slide bar and the inclined surface at the upper end of the pressing rod, the slide bar rotates slightly. After the electromagnet is powered off, the pressing rod is no longer squeezed by the permanent magnet, and the slide bar in the pressing rod is pushed to another gear at the front end by the reset spring, thereby completing the gear shift. The gear shift of the pressing rod can adjust the axial displacement of the permanent magnet fixed above it, thereby reducing the air gap of the permanent magnet, increasing the magnetic flux on the secondary flywheel, and increasing the damping force. When the damping needs to be reduced, that is, the air gap of the permanent magnet needs to be increased, at this time, it is only necessary to briefly energize the electromagnet in the operating mechanism. At the moment of energization, the permanent magnet fixed on the pressing rod is attracted by the electromagnet, and the permanent magnet pushes the slide bar in the pressing rod to the top of the pressing rod. At the same time, due to the interaction between the end of the slide bar and the inclined surface at the upper end of the pressing rod, the slide bar rotates slightly. After the electromagnet is powered off, the pressing rod is no longer squeezed by the permanent magnet, and the slide bar in the pressing rod is pushed to the front end by the reset spring to complete the gear shift again. The gear shift of the pressing rod can adjust the axial displacement of the permanent magnet fixed above it, thereby realizing the enlargement of the air gap of the permanent magnet, reducing the magnetic flux on the secondary flywheel, and reducing the damping force. Achieve an adjustable vibration reduction effect.

[0009] The engine output shaft is connected to the first rotating inertia component, and the power of the engine is transmitted to the second and third rotating inertia components through the first rotating inertia component. The inertia disc 1 in the second rotating inertia component is elastically connected to the first rotating inertia component, and the arc spring part in the first rotating inertia component initially attenuates the vibration and then transmits the motion and force to the second rotating inertia component; the inertia disc 1 in the second rotating inertia component and the secondary flywheel in the second rotating inertia component are connected by splines and fixed with bolts at the center of the circle; the third rotating inertia component is fixed on the shaft through bearings. Since permanent magnets are arranged around the inner wall of the third rotating inertia component, when the secondary flywheel (eddy current disc) in the second rotating inertia component rotates, it will generate driving force for the permanent magnet in the third rotating inertia component, thereby driving the third rotating inertia component to idle; the rightmost end of the dual-mass flywheel is connected to the outer shell by the electromagnet in the operating mechanism, which is not connected to the dual-mass flywheel. It is stationary and only provides axial attraction to the permanent magnet when adjusting the gear.

[0010] When the torsional vibration generated by the engine is transmitted to the first rotating inertia component, there is vibration. By adjusting the stiffness of the arc spring inside the first rotating inertia component, the vibration can be attenuated when the vibration reaches the second rotating inertia component. However, the vibration is still large and can be further weakened by the subsequent operation mechanism and eddy current mechanism. First, the third rotating inertia component is fixed on the shaft through a bearing. Since permanent magnets are arranged around the inner wall of the third rotating inertia component, when the secondary flywheel (eddy current disk) in the second rotating inertia component rotates, it will generate a driving force for the permanent magnet in the third rotating inertia component, thereby driving the third rotating inertia component to idle at a constant speed. When vibration occurs, the secondary flywheel (eddy current disk) in the second rotating inertia component ) will move relative to the third rotating inertia component, and the secondary flywheel (eddy current disk) in the second rotating inertia component begins to cut the magnetic flux lines generated by the permanent magnet to generate a damping torque to hinder the vibration of the secondary flywheel; when the vibration reaches a certain value, the electromagnet can be briefly energized so that the permanent magnet fixed on the pressing rod is attracted by the electromagnet, the pressing rod is squeezed, and the slide bar in the pressing rod moves to the upper shift position. When the electromagnet stops energizing, the return spring in the pressing rod pushes the slide bar inside the pressing rod to another gear position at the front end. The permanent magnet changes its air gap as the pressing rod pushes it, making the air gap of the permanent magnet shorter and the magnetic field stronger. The eddy current and resistance generated by the second rotating inertia component cutting the magnetic flux lines are also stronger.

[0011] Finally, when the vibration frequency is less than the set value, the air gap of the permanent magnet can be increased; at this time, it is only necessary to briefly energize the electromagnet to drive the pressing rod to move and achieve gear shifting. As a result, the air gaps of multiple groups of permanent magnets in the eddy current mechanism are increased, the magnetic flux on the secondary flywheel is reduced, and the damping force becomes smaller.

[0012] Beneficial effects:

[0013] The present invention combines eddy current technology with dual mass flywheel (DMF) vibration reduction theory and dynamic vibration absorption principle, and innovatively proposes a new vibration reduction mechanism that combines both control method and vibration reduction function, solving the problems of single DMF vibration reduction working principle and narrow working frequency band in the past, and can achieve ideal vibration reduction effect, facilitating engineering promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The overall structure of the present invention is schematically shown;

[0015] Figure 2 The exploded view of the overall structure of the present invention is schematically shown;

[0016] Figure 3 The exploded view of the structure of the first rotational inertia component is schematically shown;

[0017] Figure 4 Schematically shows the cross-sectional view of the second and third rotational inertia components, eddy current generation and control mechanism structure installation of the present invention;

[0018] Figure 5 The structure diagram of the pressing rod of the present invention is schematically shown;

[0019] Figure 6 The schematic diagram of the overall structure and working principle of the present invention is shown;

[0020] Figure 7 The operation logic diagram of the present invention is schematically shown;

[0021] Among them, the figure numbers are: 1-first rotating inertia component; 2-second rotating inertia component; 3-second rotating inertia component; 4-operating mechanism; 101-left cover plate; 102-transmission plate; 103-arc spring; 104-connecting plate; 105-right cover plate; 201-inertia disk 1; 202-secondary flywheel; 301-inertia disk 2; 302-permanent magnet 1; 303-permanent magnet 2; 304-inertia disk 3; 401-pressing rod mechanism; 402-electromagnet operating mechanism; 4011-top end of pressing rod; 4012-pressing rod sliding rod; 4013-bottom end of pressing rod. DETAILED DESCRIPTION

[0022] The present application is further described below in conjunction with the accompanying drawings. The accompanying drawings are only for illustrative purposes and are only schematic diagrams, not actual drawings, and cannot be understood as limiting the present patent; in order to better illustrate the embodiments of the present application, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0023] Specific embodiment: The present invention realizes the control and vibration reduction functions by adding a third rotation inertia component M3 (3) and an eddy current control mechanism (4) to the dual-mass flywheel components M1 (1) and M2 (2);

[0024] Specifically, Figure 1 , 2 As shown in , 3, 4, 5, 6, and 7, the third rotation inertia component M3 (eddy current generating mechanism) is fixed on the shaft through a bearing and wrapped outside the secondary flywheel in the second rotation inertia. Figure 6 As shown, the working principle of the push rod is as follows Figure 5 As shown, when the torsional vibration generated by the engine is transmitted to the first rotating inertia component M1 through the output shaft, there is a large vibration phenomenon at first, and it rotates with the rotating shaft. Since there is an arc spring in the first rotating inertia component M1, according to the DMF vibration reduction principle, the arc spring can initially reduce the vibration generated by the system and transmit power to the second rotating inertia component M2 in the middle;

[0025] Furthermore, the third rotating inertia component M3 is mounted on the shaft via a bearing. Since permanent magnets are arranged around the inner wall of the third rotating inertia component M3, when the secondary flywheel (202) in the second rotating inertia component M2 rotates rapidly, it will cut the magnetic flux lines generated by the permanent magnets in the third rotating inertia component M3, thereby generating eddy current and driving force, driving the third rotating inertia component M3 to rotate at a constant speed. When the secondary flywheel (202) in the second rotating inertia component M2 vibrates and moves relative to the third rotating inertia component M3, the secondary flywheel (202) in the second rotating inertia component M2 will cut the magnetic flux lines generated by the permanent magnets (302, 303) in the third rotating inertia component M3, thereby generating a damping force to hinder the vibration of the second rotating inertia component M2.

[0026] Furthermore, when the vibration is small, the slide bar (4012) in the pressing rod is in the slide bar retraction position, such as Figure 5 As shown in (a), at this time, the permanent magnet 2 (303) connected to the slide bar is also in a state away from the secondary flywheel (202);

[0027] Furthermore, when the vibration frequency reaches the set value, eddy current generation and the operation mechanism need to participate in vibration reduction, the electromagnet (402) is briefly energized to attract the right permanent magnet (303), so that the pressing rod (402) in the operation mechanism is squeezed, and the sliding rod (4012) in the pressing rod is squeezed to the top. Since the top of the sliding rod (4012) and the top (4011) of the pressing rod are both provided with interacting inclined surfaces, the sliding rod (4012) rotates slightly when it is pressed to the top. At this time, the position of the sliding rod is as follows: Figure 5 (b)

[0028] Furthermore, the electromagnet (402) is powered off, the permanent magnet 2 (303) loses its attraction to the right, the pressing rod (401) also loses the pressing force from the permanent magnet (402), and the sliding rod (4012) in the pressing rod is pushed to the bottom end (4013) by the return spring. Due to the interaction between the inclined surface at the bottom of the sliding rod (4012) and the inclined surface at the bottom end (4013) of the pressing rod, the sliding rod (4012) also slightly rotates when it is pushed to the front end by the return spring. Finally, the sliding rod (4012) is pushed to another gear position at the front end by the return spring. The position in the sliding rod is as shown in FIG. Figure 5 (c)

[0029] Furthermore, the permanent magnet 2 (303) is also pushed by the slide bar (4012) toward the secondary flywheel (202), and at the same time, the air gap between the permanent magnet 1 (302) and the permanent magnet 2 (302) becomes smaller, thereby increasing the magnetic induction intensity and the eddy current damping torque, achieving a better vibration reduction effect and making the secondary flywheel (202) more stable.

[0030] Furthermore, when the vibration frequency is lower than the set value, the magnetic field needs to be weakened;

[0031] Furthermore, if the air gap between the permanent magnets needs to be reduced, the electromagnet (402) only needs to be briefly energized again to attract the right permanent magnet 2 (303) so that it squeezes the pressing rod 1, and the push rod (4012) in the pressing rod is shifted and retracted again;

[0032] Furthermore, the permanent magnet 2 (303) moves to the right, and the air gap between the permanent magnets becomes larger, thereby reducing the magnetic induction intensity and the eddy current damping torque, thereby reducing the resistance to the eddy current disk (201);

[0033] Furthermore, when the system stops working, the permanent magnet 2 (303) shrinks to the initial position, and the pressing rod and the electromagnet return to the state before the start of work.

[0034] The above embodiments are only used to illustrate the present application, rather than to limit the present application. Technicians in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions should also fall within the scope of protection of the present application, and the scope of protection of the present application should be defined by the claims.

Claims

1. A novel eddy current three-mass flywheel torsional vibration damper, characterized in that: It comprises a first rotational inertia component, a second rotational inertia component, a third rotational inertia component, and an eddy current generating and operating mechanism; the operating mechanism is composed of an electromagnet and a pressing rod.

2. The novel eddy current three-mass flywheel torsional vibration damper according to claim 1 is characterized in that: The eddy current generating mechanism is composed of multiple groups of permanent magnets distributed in the circumferential direction, located on both sides of the secondary flywheel of the second rotating inertia, fixed to the inner wall of the inertia disk in the third rotating inertia component, and there is an air gap between the multiple groups of permanent magnets. The damping force intensity generated by the eddy current can be adjusted by changing the air gap between the two groups of permanent magnets, and the change of the air gap is controlled by briefly energizing the electromagnet to attract the permanent magnet fixed on the pressing rod, so that the pressing rod is pressed by the permanent magnet to shift gears.

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