A vibration isolation device for an engine accessory

Abstract

The application discloses a vibration isolation device of an engine accessory, which comprises a balance plate, an electromagnetic balance piece arranged on the balance plate, a first fixing piece arranged on one side of the balance plate, a second fixing piece arranged on the other side of the balance plate, a vibration sensor and a rotating speed sensor, and a control device electrically connected with the vibration sensor and the rotating speed sensor. The control device controls the connection and the closing of the power supply of the electromagnetic balance piece according to the signals detected by the rotating speed sensor and the vibration sensor, changes the connection state of the engine accessory and the engine according to the vibration frequency of the engine accessory and the rotating speed of the engine, and rigidly connects the engine and the engine accessory when the vibration frequency of the engine accessory is small or when the rotating speed of the engine is small, so that the connection is more stable and the stability of the engine accessory is improved. When the vibration frequency of the engine accessory is large and the rotating speed of the engine is large, the engine and the engine accessory are connected through the vibration isolation device, and the elastic piece reduces the transmission of the vibration of the engine.

Description

Technical Field

[0001] This application belongs to the field of engine technology, and in particular relates to a vibration isolation device for engine accessories. Background Technology

[0002] Existing diesel engines typically use a rigid connection between the engine's external accessories and the cylinder. This setup results in vibrations during high-speed engine operation. When these vibrations occur, the heavier engine accessories, which are rigidly connected to the engine, resonate, leading to increased vibration of the engine accessories. Over long-term operation, this resonance can cause bolts to loosen, cracks to appear, and ultimately, connection failure at the junction of the engine accessories and the cylinder.

[0003] To address this issue, existing technologies employ vibration damping devices such as airbag damping and electromagnetic damping. These devices completely isolate the engine from its accessories across the entire engine speed range. In the high-speed range of the engine and when the vibration frequency of the engine accessories is high, they can also isolate the engine from its accessories, preventing resonance between the engine and its accessories that could lead to increased vibration amplitude and frequency of the accessories and cause connection failure during prolonged operation.

[0004] However, in the low-speed range of the engine or when the vibration frequency of engine accessories is low, it is not necessary to isolate the engine from the engine accessories. The aforementioned setup still isolates the engine from the engine accessories in the low-speed range. In this case, due to the vibration damping device between the engine and engine accessories, the vibration of the engine accessories cannot be controlled, resulting in an increase in the vibration amplitude of the engine accessories.

[0005] Therefore, there is an urgent need to propose a device that can change the connection method between the engine and engine accessories according to the engine speed, in order to solve the technical problem of existing shock absorption devices that still elastically connect the engine and engine accessories in the low engine speed range or when the vibration frequency of the engine accessories is low. Summary of the Invention

[0006] This application provides a vibration isolation device for engine accessories to solve the technical problem mentioned above, which is that the vibration damping device can still isolate the engine from the engine accessories in the low speed range of the engine or when the vibration frequency of the engine accessories is low.

[0007] The technical solution adopted in this application is as follows: a vibration isolation device for engine accessories, including a balance plate, an electromagnetic balancing component disposed on the balance plate, a first fixing component disposed on one side of the balance plate, and a second fixing component disposed on the other side of the balance plate. The first fixing component is fixedly connected to a first permanent magnet. The engine accessory is connected to the balance plate. The first fixing component and / or the second fixing component are connected to the engine. The first fixing component and the balance plate are connected through a first elastic component. The second fixing component and the balance plate are connected through a second elastic component. The vibration isolation device further includes a vibration sensor for detecting the vibration frequency of the engine accessory and a speed sensor for detecting the engine speed. The vibration sensor and the speed sensor are electrically connected to a control device. The control device controls the electromagnetic balancing component to be energized or de-energized according to the signals detected by the speed sensor and the vibration sensor, so that the electromagnetic balancing component can attract the first permanent magnet or keep the balance plate between the first elastic component and the second elastic component.

[0008] The vibration isolation device for the engine accessory described in this application also has the following additional technical features:

[0009] The electromagnetic balancing component has a connection position when the vibration frequency of the accessory or the engine speed is less than a preset value, and a balance position when the vibration frequency of the accessory and the engine speed are both greater than the preset value. When it is in the connection position, the electromagnetic balancing component is energized and the balance plate is connected to the first permanent magnet. When it is in the balance position, the electromagnetic balancing component is de-energized and the balance plate is located between the first elastic member and the second elastic member to reduce the vibration frequency of the engine accessory.

[0010] The second fixing member is also fixedly connected to a second permanent magnet sheet.

[0011] The first permanent magnet sheet and / or the second permanent magnet sheet protrude toward the electromagnetic balancer.

[0012] The first elastic element and the second elastic element are annular elastic elements with a maximum diameter the same as the width of the balance plate and hollow inside.

[0013] The first fixing member includes a connecting portion smaller than the inner diameter of the elastic member, and an abutting portion that abuts against the elastic member, wherein the first permanent magnet sheet is fixedly disposed on the connecting portion.

[0014] An elastic element is provided at the end of the first permanent magnet sheet that is away from the electromagnetic balancing element.

[0015] The balance plate has a connection port.

[0016] Both the first elastic element and the second elastic element are made of metal.

[0017] The vibration isolation device is provided in multiple units, and the multiple vibration isolation devices are connected to the engine accessories.

[0018] Due to the adoption of the above technical solution, the beneficial effects obtained by this application are as follows:

[0019] 1. This application provides a speed sensor and a vibration sensor on the engine, enabling the control device to control the power supply of the electromagnetic balancing component based on the engine speed and the vibration frequency of the engine accessories. When the speed sensor detects a low engine speed or the vibration sensor detects a low vibration frequency of the engine accessories, the control device turns on the power supply of the electromagnetic balancing component. The electromagnetic balancing component generates electromagnetic waves, and the electrode of the electromagnetic balancing component near the first permanent magnet is opposite to the electrode of the first permanent magnet. The first permanent magnet attracts the electromagnetic balancing component to move towards the first permanent magnet. At this time, under the attraction between the electromagnetic balancing component and the first permanent magnet, the balance plate moves upward to a position abutting against the first permanent magnet. The balance plate cannot move, therefore, it can be considered that the engine accessories and the engine are rigidly connected. Compared to the prior art, which uses an elastic element to isolate vibration between the engine and the engine accessories, a rigid connection is achieved when the engine speed is low or the vibration frequency of the engine accessories is low. This system enables controllable vibration of the engine accessory and reduces its vibration amplitude, thereby effectively reducing its vibration frequency. When the speed sensor detects a high engine speed and the vibration sensor detects a high vibration frequency of the engine accessory, the control device sends a power-off signal. At this time, the electromagnetic field of the electromagnetic balancing component disappears, and the balancing plate moves away from the first permanent magnet under the action of the first elastic element, moving to a position between the first and second elastic elements. Since the engine accessory is connected to the balancing plate, and the balancing plate is located between the first and second elastic elements, i.e., the engine accessory and the engine are elastically connected, the transmission of vibration between the engine and the engine accessory can be reduced, thereby reducing the vibration frequency of the engine accessory. This avoids the situation where the engine accessory and the engine resonate, increasing the vibration frequency and generating noise, and also avoids the connection failure at the connection point between the engine accessory and the engine due to vibration, thus improving the vibration isolation effect of the vibration isolation device.

[0020] The vibration isolation device can change the connection state between the engine accessory and the engine according to the vibration frequency of the engine accessory and the engine speed. When the vibration frequency of the engine accessory is low or the engine speed is low, the engine and the engine accessory are rigidly connected. Compared with the prior art of using a shock-absorbing device to movably connect the engine and the engine accessory, the rigid connection is more stable and avoids uncontrollable vibration of the engine accessory or increased amplitude of the engine accessory. This improves the stability of the engine accessory when the engine speed is low and the vibration frequency of the engine accessory is low. When the vibration frequency of the engine accessory is high and the engine speed is high, the engine and the engine accessory are connected through the vibration isolation device, that is, the engine and the engine accessory are connected through the first elastic element and the second elastic element. The first elastic element and the second elastic element reduce the transmission of the engine vibration, thereby reducing the frequency of the engine accessory's vibration with the engine vibration, so that the engine accessory can effectively absorb vibration and avoid resonance between the engine accessory and the engine.

[0021] 2. This application provides the engine with a connection position and a balance position. When the vibration sensor detects that the vibration frequency of the engine accessory is less than the preset value set by the control device, or when the speed sensor detects that the engine speed is less than the preset value set by the control device, the control device controls the electromagnetic balancer to be energized. The electromagnetic balancer is located at the connection position and connected to the first permanent magnet. At this time, it can be regarded as the engine accessory being rigidly connected to the engine, which makes the vibration of the engine accessory controllable and reduces the vibration amplitude of the engine accessory, thereby effectively reducing the vibration frequency of the engine accessory. When the vibration sensor detects that the vibration frequency of the engine accessory is greater than the preset value set by the control device and the speed sensor detects that the engine speed is greater than the preset value set by the control device, the control device controls the electromagnetic balancer to be de-energized. The electromagnetic balancer is located at the balance position, and the balance plate is located between the first elastic element and the second elastic element. At this time, Under the action of the first and second elastic elements, the vibration frequency transmitted from the engine to the engine accessory can be effectively reduced. This prevents resonance between the engine accessory and the engine, thus avoiding connection failure and improving the reliability of the connection. The balancing element can change its state according to the vibration frequency of the engine accessory and the engine speed. At low speeds or low vibration frequencies, when no vibration damping is needed for the engine accessory, the electromagnetic balancing element is in the connection position, maintaining a rigid connection between the engine and the engine accessory, ensuring the connection strength. At high speeds and high vibration frequencies, the electromagnetic balancing element is in the balance position, effectively damping the engine accessory and preventing increased vibration frequency due to resonance, noise generation, and connection failure due to prolonged vibration, thus improving the reliability of the connection between the engine and the engine accessory.

[0022] 3. This application further fixes a second permanent magnet to the second fixing member. When the electromagnetic balancing member is in the connection position, and the electromagnetic balancing member is energized, the first permanent magnet attracts the electromagnetic balancing member, causing the balance plate to move upward. The second permanent magnet repels the electromagnetic balancing member, increasing the upward force provided to the balance plate. Since the balance plate is connected to the generator accessory, it needs to resist the gravity of the generator accessory to move upward. By setting the second permanent magnet, the force of the balance plate against gravity is increased, making the connection between the balance plate and the first permanent magnet more reliable when the electromagnetic balancing member is in the connection position. This avoids the situation where the balance plate separates from the first permanent magnet due to the weak attraction between the first permanent magnet and the electromagnetic balancing member, thus improving the stability of the connection when the electromagnetic balancing member is in the connection position.

[0023] 4. This application reduces the distance between the electromagnetic balancer and the first permanent magnet, as well as between the electromagnetic balancer and the second permanent magnet, by configuring the first permanent magnet and the second permanent magnet to protrude towards the electromagnetic balancer. This increases the attractive force of the first permanent magnet on the electromagnetic balancer, resulting in a greater attraction between them. This attraction causes the electromagnetic balancer to move the balance plate closer to the first permanent magnet. Since the balance plate is connected to the engine accessory, the first permanent magnet can provide a greater force to the balance plate, enabling it to move the engine accessory closer to the first permanent magnet. This also makes the contact between the electromagnetic balancer and the first permanent magnet more secure, further improving the reliability of the connection between the first permanent magnet and the electromagnetic balancer when the electromagnetic balancer is in the connection position.

[0024] 5. This application sets the maximum diameter of the first elastic element and the second elastic element to be the same as the width of the balance plate, so that the vibration isolation device can be more convenient to assemble and avoids the situation where the first elastic element or the second elastic element protrudes due to improper assembly during assembly, so as to make the vibration isolation device have better consistency. At the same time, setting the elastic element to be ring-shaped increases the elasticity of the balance plate from the elastic element, improves the vibration reduction effect of the electromagnetic balance element when it is in the balance position, and thus improves the vibration isolation effect of the vibration isolation device. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a schematic diagram of the connection between the vibration isolation device and the engine accessory in one embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the vibration isolation device according to one embodiment of this application;

[0028] Figure 3 This is an exploded view of a vibration isolation device according to one embodiment of this application;

[0029] Figure 4 This is a flowchart of a vibration isolation device according to one embodiment of this application;

[0030] Figure 5 This application presents an example of a vibration isolation device based on one embodiment.

[0031] in,

[0032] 1-Balance plate, 11-Connection port;

[0033] 2-Electromagnetic balancing components;

[0034] 3-First fastener, 31-Connecting part, 32-Abutting part;

[0035] 4-Second fastener;

[0036] 5-First permanent magnet sheet;

[0037] 6-First elastic element;

[0038] 7-Second elastic element;

[0039] 8-Vibration sensor;

[0040] 9-Control device;

[0041] 10 - Second permanent magnet sheet;

[0042] 11-Engine;

[0043] 12-Engine accessories. Detailed Implementation

[0044] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0046] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0049] like Figures 1-3As shown, this application provides a vibration isolation device for an engine accessory, including a balance plate 1, an electromagnetic balancing component 2 disposed on the balance plate 1, a first fixing component 3 disposed on one side of the balance plate 1, and a second fixing component 4 disposed on the other side of the balance plate 1. The first fixing component 3 is fixedly connected to a first permanent magnet 5. The engine accessory 12 is connected to the balance plate 1, and the first fixing component 3 and the second fixing component 4 are connected to the engine 11. The first fixing component 3 is connected to the balance plate 1 through a first elastic component 6, and the second fixing component 4 is connected to the balance plate 1 through a second elastic component 7. The vibration isolation device also includes a vibration sensor 8 for detecting the vibration frequency of the engine accessory 12 and a speed sensor for detecting the speed of the engine 11. The vibration sensor 8 and the speed sensor are electrically connected to a control device 9. The control device 9 controls the electromagnetic balancing component 2 to be energized or de-energized according to the signals detected by the speed sensor and the vibration sensor 8, so that the electromagnetic balancing component 2 can attract the first permanent magnet 5 or keep the balance plate 1 between the first elastic component 6 and the second elastic component 7.

[0050] By equipping the engine 11 with a speed sensor and the engine accessory 12 with a vibration sensor 8, the electronic control unit 9 can control the power supply of the electromagnetic balancer 2 based on the engine speed of the engine 11 and the vibration frequency of the engine accessory 12. When the speed sensor detects a low engine speed or the vibration sensor 8 detects a low vibration frequency of the engine accessory 12, the control unit 9 controls the power supply of the electromagnetic balancer 2 to be turned on. The electromagnetic balancer 2 generates electromagnetic waves, and the electrode of the electromagnetic balancer 2 near the first permanent magnet plate 5... Opposite to the electrodes of the first permanent magnet 5, the first permanent magnet 5 attracts the electromagnetic balancing member 2 to move towards the first permanent magnet 5. At this time, under the attraction between the electromagnetic balancing member 2 and the first permanent magnet 5, the balance plate 1 moves upward to the position where the first permanent magnet 5 abuts. The balance plate 1 cannot move, therefore, it can be regarded as the engine accessory 12 and the engine 11 being rigidly connected. Compared with the prior art, which uses an elastic member between the engine 11 and the engine accessory 12 for vibration isolation, when the engine 11 speed is low or the engine accessory vibration frequency is low, the rigid connection can make... The vibration of the engine accessory 12 is controllable, and the vibration amplitude of the engine accessory 12 is reduced, thereby effectively reducing the vibration frequency of the engine accessory 12. When the speed sensor detects that the engine speed of the engine 11 is high and the vibration sensor 8 detects that the vibration frequency of the engine accessory 12 is high, the control device 9 sends a power-off signal. At this time, the electromagnetic field of the electromagnetic balancer 2 disappears, and the balance plate 1 moves away from the first permanent magnet 5 under the action of the first elastic member 6, moving to a position between the first elastic member 6 and the second elastic member 7. Since the engine accessory 12 is connected to the... The balance plate 1 is located between the first elastic member 6 and the second elastic member 7, meaning that the engine accessory 12 and the engine 11 are elastically connected. Therefore, the transmission of vibration between the engine 11 and the engine accessory 12 can be reduced, thereby reducing the vibration frequency of the engine accessory 12. This avoids the situation where the engine accessory 12 and the engine 11 resonate, increasing the vibration frequency and generating noise. At the same time, it avoids the situation where the connection between the engine accessory 12 and the engine 11 fails due to vibration, thus improving the vibration isolation effect of the vibration isolation device.

[0051] The vibration isolation device can change the connection state between the engine accessory 12 and the engine 11 according to the vibration frequency of the engine accessory 12 and the rotational speed of the engine 11. When the vibration frequency of the engine accessory 12 is low or when the rotational speed of the engine 11 is low, the engine 11 and the engine accessory 12 are rigidly connected. Compared with the prior art of using a shock-absorbing device to movably connect the engine 11 and the engine accessory 12, the rigid connection is more stable, avoiding uncontrollable vibration of the engine accessory 12 and increased amplitude of the engine accessory 12, thus improving the stability of the engine accessory 12. The stability is maintained when the engine 11 rotates at a low speed and the engine accessory 12 vibrates at a low frequency. When the vibration frequency of the engine accessory 12 is high and the engine 11 rotates at a high speed, that is, when the engine 11 and the engine accessory 12 are connected through the first elastic member 6 and the second elastic member 7, the first elastic member 6 and the second elastic member 7 reduce the transmission of the vibration of the engine 11, thereby reducing the frequency of the vibration of the engine accessory 12 with the vibration of the engine 11, so that the engine accessory 12 can effectively reduce vibration and avoid resonance between the engine accessory 12 and the engine 11.

[0052] It should be noted that this application does not limit the connection position of the engine 11 to the vibration isolation device. It can be connected to the first fixing member 3 or the second fixing member 4. Of course, it can also be connected to both the first fixing member 3 and the second fixing member 4. This needs to be determined according to the specific structure of the engine 11.

[0053] As a preferred embodiment of this application, such as Figure 1 As shown, the electromagnetic balancing component 2 has a connection position when the vibration frequency of the accessory and the speed of the engine 11 are less than a preset value, and a balance position when the vibration frequency of the accessory and the speed of the engine 11 are both greater than the preset value. When it is in the connection position, the electromagnetic balancing component 2 is energized and the balance plate 1 is connected to the first permanent magnet 5. When it is in the balance position, the electromagnetic balancing component 2 is de-energized and the balance plate 1 is located between the first elastic member 6 and the second elastic member 7 to reduce the vibration frequency of the engine accessory 12.

[0054] By providing a connection position and a balance position for the engine 11, when the vibration sensor 8 detects that the vibration frequency of the engine accessory 12 is less than the preset value set by the control device 9, or when the speed sensor detects that the speed of the engine 11 is less than the preset value set by the control device 9, the control device 9 controls the electromagnetic balancer 2 to be energized. The electromagnetic balancer 2 is located at the connection position and is connected to the first permanent magnet 5. At this time, it can be regarded as the engine accessory 12 and the engine 11 being rigidly connected, which makes the vibration of the engine accessory 12 controllable and reduces the vibration amplitude of the engine accessory 12, thereby effectively reducing the vibration frequency of the engine accessory 12. When the vibration sensor 8 detects that the vibration frequency of the engine accessory 12 is greater than the preset value set by the control device 9 and the speed sensor detects that the speed of the engine 11 is greater than the preset value set by the control device 9, the control device 9 controls the electromagnetic balancer 2 to be de-energized. When the electromagnetic balancer 2 is located at the balance position, the balance plate 1 is located between the first elastic member 6 and the second elastic member 7. At this time, in the first Under the action of the elastic element 6 and the second elastic element 7, the vibration frequency transmitted from the engine 11 to the engine accessory 12 can be effectively reduced. This prevents resonance between the engine accessory 12 and the engine 11, thus avoiding connection failure and improving the reliability of the connection. The balancing element can change its state according to the vibration frequency of the engine accessory 12 and the rotational speed of the engine 11. When the balancing element is at low speed or low vibration frequency, and no damping of the engine accessory 12 is required, the electromagnetic balancing element 2 is in the connection position, maintaining a rigid connection between the engine 11 and the engine accessory 12, ensuring the connection strength. At high speed and high vibration frequency, the electromagnetic balancing element 2 is in the balance position, effectively damping the engine accessory 12, preventing increased vibration frequency due to resonance between the engine 11 and the engine accessory 12, noise generation, and connection failure due to prolonged vibration, thus improving the reliability of the connection.

[0055] The specific calculation method of the control device 9 described in this application is as follows: by setting an initial preset value n of the engine speed signal of the engine 11 within the control device 9. c and the initial vibration frequency m n When the speed sensor detects that the speed of the engine 11 is less than n cAt this time, the control device 9 controls the power supply of the electromagnetic balancing component 2 to be turned on, and the balancing plate 1 is attracted to the first permanent magnet plate 5 under the drive of the electromagnetic balancing component 2. At this time, the engine accessory 12 and the engine 11 can be regarded as rigidly connected. In this state, the natural frequency of the engine accessory 12 is f. a The unit is Hz. According to formula (1), the resonant rotational speed n can be calculated. a The unit is r / min, where m is the main excitation harmonic order of the engine 11.

[0056]

[0057] In the high-speed region, that is, when the speed signal of the engine 11 is greater than n... c At that time, and when the vibration frequency signal detected by the vibration sensor 8 exceeds m n When the control device 9 sends a power-off signal, the electromagnetic balancer 2 does not generate polarity. Under the influence of the gravity of the engine accessory 12 and the action of the first elastic element 6 and the second elastic element 7, the balance plate 1 remains in the middle position between the first elastic element 6 and the second elastic element 7, achieving an elastic connection between the engine 11 and the engine accessory 12. At this time, the natural frequency of the engine accessory 12 is f. b The unit is Hz, and the calculation formula is formula (2). According to formula (3), the resonant speed n can be calculated. b ,

[0058]

[0059]

[0060] The stiffness of the first elastic element 6 is K. a The stiffness of the second elastic element 7 is K. b .

[0061] At high speeds, the vibration isolation device, with its elastic connection, ensures that the engine accessory 12 is in the vibration isolation zone of the vibration transmissibility curve, significantly reducing the vibration amplitude of the engine accessory 12 and preventing resonance.

[0062] For example:

[0063] Taking a V-type ten-cylinder diesel engine as an example, its main excitation harmonic order is 5th, and its operating speed ranges from 800 r / min at idle to 3800 r / min.

[0064] If the natural frequency of a certain diesel engine accessory is 148Hz, when the diesel engine is running at 1776r / min, the main excitation frequency of the diesel engine is 148Hz, that is, (1776÷60)X5=148. The excitation frequency coincides with the natural frequency, and the accessory will resonate and vibrate violently. If it runs at 1776r / min for a long time, the accessory will be damaged.

[0065] The vibration isolation device for engine accessories using the solution of this invention has the following vibration isolation effect:

[0066] In the low-speed range, i.e. below 940 r / min, the electromagnetic balancing component drives the balancing plate to attract the first permanent magnet, and the diesel engine accessory is rigidly connected to the diesel engine cylinder block. The vibration of the diesel engine accessory is controllable and the vibration amplitude is low.

[0067] In the high-speed range, above 940 r / min, the balance plate is located between the first and second elastic elements, achieving an elastic connection. This elastic connection at high speeds ensures that the diesel engine's peripheral accessories are within the vibration isolation zone of the vibration transmissibility curve, significantly reducing the vibration amplitude of the peripheral accessories and preventing resonance.

[0068] As a preferred embodiment of this application, such as Figure 2 As shown, the second fixing member 4 is also fixedly connected to a second permanent magnet sheet 10.

[0069] By providing a second permanent magnet 10 below the electromagnetic balancer 2, when the electromagnetic balancer 2 is in the connection position and energized, the first permanent magnet 5 attracts the electromagnetic balancer 2, causing the balance plate 1 to move upward. The second permanent magnet 10 repels the electromagnetic balancer 2, increasing the upward force on the balance plate 1. Since the balance plate 1 is connected to the generator accessory, it needs to resist the gravity of the engine accessory 12 to move upward. Providing the second permanent magnet 10 increases the force of the balance plate 1 against gravity, making the connection between the balance plate 1 and the first permanent magnet 5 more reliable. This avoids the situation where the balance plate 1 separates from the first permanent magnet 5 due to the weak attraction between the first permanent magnet 5 and the electromagnetic balancer 2, thus improving the stability of the connection when the electromagnetic balancer 2 is in the connection position.

[0070] Furthermore, such as Figure 2 As shown, the first permanent magnet 5 and the second permanent magnet 10 protrude toward the electromagnetic balancer 2.

[0071] By setting the first permanent magnet plate 5 and the second permanent magnet plate 10 to protrude towards the electromagnetic balancer 2, the distance between the electromagnetic balancer 2 and the first permanent magnet plate 5, as well as between the electromagnetic balancer 2 and the second permanent magnet plate 10, is reduced. This increases the attractive force of the first permanent magnet plate 5 on the electromagnetic balancer 2, resulting in a greater attraction between them. This attraction causes the electromagnetic balancer 2 to move the balance plate 1 closer to the position of the first permanent magnet plate 5. Since the balance plate 1 is connected to the engine accessory 12, the first permanent magnet plate 5 can provide a greater force to the balance plate 1, enabling the balance plate 1 to move the engine accessory 12 closer to the first permanent magnet plate 5. This also makes the contact between the electromagnetic balancer 2 and the first permanent magnet plate 5 more secure, further improving the reliability of the connection between the first permanent magnet plate 5 and the electromagnetic balancer 2 when the electromagnetic balancer 2 is in the connection position.

[0072] As a preferred embodiment of this application, such as Figure 3 As shown, the first elastic element 6 and the second elastic element 7 are annular elastic elements with a maximum diameter equal to the width of the balance plate 1 and hollow inside.

[0073] By setting the maximum diameter of the first elastic element 6 and the second elastic element 7 to be the same as the width of the balance plate 1, the vibration isolation device can be more convenient to assemble, avoiding the situation where the first elastic element 6 or the second elastic element 7 protrudes due to improper assembly, thus giving the vibration isolation device better consistency. At the same time, setting the elastic element to be ring-shaped increases the elasticity of the balance plate 1 from the elastic element, improves the vibration reduction effect of the electromagnetic balance element 2 when it is in the balance position, and thus improves the vibration isolation effect of the vibration isolation device.

[0074] Furthermore, such as Figure 3 As shown, the first fixing member 3 includes a connecting part 31 smaller than the inner diameter of the elastic member, and an abutting part 32 that abuts against the first elastic member 6. The first permanent magnet 5 is fixedly disposed on the connecting part 31.

[0075] By providing an abutment portion 32 to the first fixing member 3 and fixing the permanent magnet plate to the connecting portion 31, the permanent magnet plate can extend into the interior of the annular elastic member, thereby shortening the distance between the first permanent magnet plate 5 and the electromagnetic balance member 2, increasing the attraction of the first permanent magnet plate 5 to the electromagnetic balance member 2, and making the connection of the electromagnetic balance member 2 more reliable when it is located at the connecting position. At the same time, by providing the abutment portion 32 to the first fixing member 3 so that the first fixing member 3 can be connected to the elastic member through the abutment portion 32, the area occupied by the first fixing member 3 is reduced, thereby achieving the overall lightweighting of the vibration isolation device. On the other hand, since the first permanent magnet plate 5 is fixedly set to the connecting portion 31, there is no need to provide a separate connecting device for the first permanent magnet plate 5. When the first fixing member 3 is connected to the first elastic member 6, the permanent magnet plate can be connected to the vibration isolation device, simplifying the connection method of the first permanent magnet plate 5.

[0076] In a preferred embodiment of this application, a third elastic element is provided at the end of the first permanent magnet 5 away from the electromagnetic balance element 2.

[0077] By providing a third elastic element at the end of the permanent magnet sheet away from the electromagnetic balancer 2, the third elastic element remains compressed when the electromagnetic balancer 2 is in the connection position, so that the engine accessory 12 and the engine 11 are rigidly connected. In this state, the first permanent magnet sheet 5 deforms away from the electromagnetic balancer 2. When the electromagnetic balancer 2 is in the balance position, the balance plate 1, under the action of the gravity of the engine accessory 12, is located between the first elastic element 6 and the second elastic element 7. Under the action of the third elastic element, the first permanent magnet 5 is reset to its initial state. This avoids the situation where the first permanent magnet 5 is not reset to its initial state, resulting in a large distance between the first permanent magnet 5 and the electromagnetic balancer 2, which would weaken the attraction of the first permanent magnet 5 to the electromagnetic balancer 2. This prevents the electromagnetic balancer 2 from being unable to contact the first permanent magnet 5 when switching from the balance position to the connection position, thus ensuring that the electromagnetic balancer 2 can smoothly switch between the connection position and the balance position.

[0078] As a preferred embodiment of this application, such as Figure 3 As shown, the balance plate 1 has a connection port 11.

[0079] By providing a connection port 11 on the balance plate 1, it is convenient to fix the motor accessories to the balance plate 1 without the need for a separate connection device. This also avoids the situation where drilling holes would damage the vibration isolation device, simplifying the connection method and improving the reliability of the vibration isolation device connection.

[0080] In a preferred embodiment of this application, both the first elastic element 6 and the second elastic element 7 are made of metal.

[0081] By making both the first elastic element 6 and the second elastic element 7 a metal material, the first elastic element 6 and the second elastic element 7 can withstand higher temperatures, which improves the applicability of the vibration isolation device and extends the service life of the elastic elements.

[0082] As a preferred embodiment of this application, such as Figure 1 As shown, multiple vibration isolation devices are provided, and the multiple vibration isolation devices are connected to the engine accessory 12.

[0083] By providing multiple vibration isolation devices, the effect of the vibration isolation devices in isolating the vibration of the engine 11 is further improved, and the situation where the engine 11 and the engine accessory 12 resonate and generate noise is further avoided, thus improving the driving experience.

[0084] It should be noted that the working process of the vibration isolation device described in this application is as follows: Figure 4 As shown, under the initial signal, the control device 9 controls the electromagnetic balancer 2 to remain energized, the electromagnetic balancer 2 generates polarity, the electromagnetic balancer 2 attracts the first permanent magnet 5, thereby driving the balance plate 1 to move closer to the first permanent magnet 5, and the engine accessory 12 is rigidly connected to the engine 11.

[0085] When the engine 11 is running, the control device 9 adopts different control strategies based on the speed signal of the engine 11 and the vibration signal of the engine accessory 12.

[0086] The control device 9 sets a preset value n for the engine speed of the engine 11. c And the preset value m of the vibration frequency of engine accessory 12 n In the low-speed range, that is, when the speed signal of the engine 11 is less than n... c At this time, the electromagnetic balancing component 2 is in the contact position, and the electromagnetic balancing component 2 drives the balancing plate 1 to contact the first permanent magnet plate 5, and the engine 11 and the engine accessory 12 are rigidly connected. The vibration of the engine accessory 12 is controllable, and the vibration amplitude is low. Under this rigid connection, the natural frequency of the engine accessory 12 is f. aThe unit is Hz. According to formula (1), the resonant speed is na, and the unit is r / min.

[0087] Where m is the main excitation harmonic of the engine 11.

[0088]

[0089] In the high-speed range, when the engine speed signal of the engine 11 is greater than nc, and simultaneously, when the vibration signal of the engine accessory 12 exceeds mn, the control device 9 issues a power-off signal. The electromagnetic balance component 2 does not generate polarity. Under the influence of gravity, the balance plate 1 separates from the first permanent magnet 5. The balance plate 1 is located between the first elastic component 6 and the second elastic component 7, achieving an elastic connection. Under this elastic connection, the natural frequency of the engine accessory 12 is f. b The unit is Hz, and the calculation formula is formula (2). According to formula (3), the resonant rotational speed can be calculated as nb.

[0090]

[0091]

[0092] The stiffness of the first elastic element 6 is Ka, and the stiffness of the second elastic element 7 is Kb.

[0093] At high speeds and high vibration frequencies, the vibration isolation device, employing an elastic connection, ensures that the engine accessory 12 remains within the vibration isolation zone of the vibration transmissibility curve, significantly reducing the vibration amplitude of the engine accessory 12 and preventing resonance. The vibration isolation control effect is as follows: Figure 5 As shown.

[0094] Here, nc is determined by the intersection of the transfer rate curves of the rigid connection and the elastic connection.

[0095] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0096] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0097] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A vibration isolation device for an engine accessory, characterized in that, The device includes a balance plate, an electromagnetic balancing component disposed on the balance plate, a first fixing component disposed on one side of the balance plate, and a second fixing component disposed on the other side of the balance plate. The first fixing component is fixedly connected to a first permanent magnet. The engine accessory is connected to the balance plate. The first fixing component and / or the second fixing component are connected to the engine. The first fixing component is connected to the balance plate via a first elastic component, and the second fixing component is connected to the balance plate via a second elastic component. The vibration isolation device further includes a vibration sensor for detecting the vibration frequency of the engine accessory and a speed sensor for detecting the engine speed. The vibration sensor and the speed sensor are electrically connected to a control device. The control device determines the vibration frequency based on the engine speed. The signals detected by the speed sensor and the vibration sensor control the electromagnetic balancing component to be energized or de-energized, so that the electromagnetic balancing component can attract the first permanent magnet or keep the balance plate between the first elastic member and the second elastic member. The electromagnetic balancing component has a connection position when the vibration frequency of the accessory or the engine speed is less than a preset value and a balance position when the vibration frequency of the accessory and the engine speed are both greater than the preset value. When it is in the connection position, the electromagnetic balancing component is energized and the balance plate is connected to the first permanent magnet. When it is in the balance position, the electromagnetic balancing component is de-energized and the balance plate is located between the first elastic member and the second elastic member to reduce the vibration frequency of the engine accessory.

2. The vibration isolation device for an engine accessory according to claim 1, characterized in that, The second fixing member is also fixedly connected to a second permanent magnet sheet.

3. The vibration isolation device for an engine accessory according to claim 2, characterized in that, The first permanent magnet sheet and / or the second permanent magnet sheet protrude toward the electromagnetic balancer.

4. The vibration isolation device for an engine accessory according to claim 1, characterized in that, The first elastic element and the second elastic element are annular elastic elements with a maximum diameter the same as the width of the balance plate and hollow inside.

5. A vibration isolation device for an engine accessory according to claim 4, characterized in that, The first fixing member includes a connecting portion smaller than the inner diameter of the elastic member, and an abutting portion that abuts against the elastic member, wherein the first permanent magnet sheet is fixedly disposed on the connecting portion.

6. The vibration isolation device for an engine accessory according to claim 1, characterized in that, A third elastic element is provided at the end of the first permanent magnet sheet that is away from the electromagnetic balancing element.

7. A vibration isolation device for an engine accessory according to claim 1, characterized in that, The balance plate has a connection port.

8. A vibration isolation device for an engine accessory according to claim 1, characterized in that, Both the first elastic element and the second elastic element are made of metal.

9. A vibration isolation device for an engine accessory according to claim 1, characterized in that, The vibration isolation device is provided in multiple units, and the multiple vibration isolation devices are connected to the engine accessories.

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