Bearing type two-stage vibration isolation suspension structure and method

Abstract

The invention relates to the technical field of new energy automobile motor suspension structures, and discloses a bearing type two-stage vibration isolation suspension structure and method.A suspension framework is provided with an embedded cavity structure, an inner threaded hole is formed in the bottom of an embedded cavity, and the embedded cavity is used for installing a first-stage vibration isolation rubber bushing; a second-stage vibration isolation rubber bushing mounting hole is further formed in the suspension framework and used for mounting a second-stage vibration isolation rubber bushing, so that the suspension framework is provided with a second-stage vibration isolation structure; the vibration of the high-voltage wire harness is attenuated by the first-stage vibration isolation rubber bushing and then is transmitted to the second-stage vibration isolation rubber bushing for attenuation again, so that the NVH performance of the whole vehicle is improved; one end of the connecting support is used for fixing the high-voltage wiring harness, the other end of the connecting support is used for abutting against the first-stage vibration isolation rubber bushing, the fastener penetrates through the first-stage vibration isolation rubber bushing to be matched with the inner threaded hole to fix the connecting support to the suspension framework, the suspension framework can serve as a bearing point of the high-voltage wiring harness, and the space utilization rate of suspension in a cabin is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of motor mounting structures for new energy vehicles, and in particular to a load-bearing secondary vibration isolation mounting structure and method. Background Art

[0002] With the development of new energy vehicles, the market share of new energy vehicles has been continuously increasing. Compared with traditional fuel vehicles, the power output source of new energy vehicles has changed from an engine to a motor. The motor runs with relatively low noise and has higher requirements for the vibration and noise performance of the whole vehicle. Usually, considering the vibration isolation performance requirements of the mount during the preliminary layout, high-voltage wiring harnesses are generally not arranged on the mount. Otherwise, the vibration of the high-voltage wiring harness will be transmitted to the subframe of the vehicle body through the mount, affecting the NVH performance of the whole vehicle; since arranging the high-voltage wiring harness at the suspension will cause vibration effects, it greatly increases the difficulty of arranging the high-voltage wiring harness in the engine compartment and also reduces the space utilization rate of the mount in the engine compartment. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a load-bearing secondary vibration isolation mounting structure and method, so that the mount skeleton can be used as a bearing point for the high-voltage wiring harness, improving the space utilization rate of the mount in the engine compartment; the primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing form a secondary vibration isolation structure, and the vibration of the high-voltage wiring harness is attenuated by the primary vibration isolation rubber bushing and then transmitted to the secondary vibration isolation rubber bushing for further attenuation, thereby improving the NVH performance of the whole vehicle.

[0004] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0005] In the first aspect, a load-bearing secondary vibration isolation mounting structure includes:

[0006] A mount skeleton, on which an embedded cavity structure is provided, an internal threaded hole is provided at the bottom of the embedded cavity, and the embedded cavity is used for installing a primary vibration isolation rubber bushing; a secondary vibration isolation rubber bushing mounting hole is also provided on the mount skeleton for installing a secondary vibration isolation rubber bushing, so that the mount skeleton has a secondary vibration isolation structure; a fixing member is used to pass through the secondary vibration isolation rubber bushing to fix the mount skeleton and the subframe.

[0007] A connection bracket, one end of which is used to fix the high-voltage wiring harness, and the other end is used to abut against the primary vibration isolation rubber bushing. The connection bracket is fixed on the mount skeleton by using a fastener to pass through the primary vibration isolation rubber bushing and cooperate with the internal threaded hole. The vibration excitation of the high-voltage wiring harness is transmitted to the secondary vibration isolation rubber bushing through the primary vibration isolation rubber bushing, and the vibration transmission is attenuated by the secondary vibration isolation structure.

[0008] As a further implementation method, a boss structure is provided at the top of the suspension skeleton. An inward groove is formed at the boss to form a groove for arranging the primary vibration isolation rubber bushing, which serves as an embedded cavity. The internal threaded hole extends downward through the bottom surface of the embedded cavity.

[0009] As a further implementation method, the primary vibration isolation rubber bushing includes two layers of structures, including an outer tube of the primary vibration isolation rubber bushing and the primary vibration isolation rubber inside it. A through hole is provided inside the primary vibration isolation rubber for cooperation with a fastener; the structure of the primary vibration isolation rubber bushing is integrally vulcanized and formed.

[0010] As a further implementation method, a conductive spring is integrated inside the primary vibration isolation rubber. The conductive spring is coaxially arranged with the primary vibration isolation rubber; a round hole is provided on the boss structure, and a group of power transmission wire harnesses led out from the high-voltage wire harness pass through the round hole and are connected to the end of the conductive spring embedded in the cavity.

[0011] As a further implementation method, multiple groups of mounting holes are provided on the suspension skeleton for connecting the suspension skeleton and the motor through fixing bolts. A vibration isolation rubber is provided between the fixing bolts and the mounting holes.

[0012] As a further implementation method, the secondary vibration isolation rubber bushing includes secondary vibration isolation rubber. The outside of the secondary vibration isolation rubber is the outer tube of the secondary vibration isolation rubber bushing, and the inside is the inner tube of the secondary vibration isolation rubber bushing; a connection hole for the suspension and the subframe is formed inside the inner tube of the secondary vibration isolation rubber bushing for cooperation with the fixing part.

[0013] As a further implementation method, the primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing are connected to the suspension skeleton by a press-fitting method.

[0014] As a further implementation method, one end of the conductive spring penetrates through the primary vibration isolation rubber and is connected to the power transmission wire harness.

[0015] As a further implementation method, the switch of the current in the conductive spring can be controlled by an ECU. When the conductive spring is energized, the conductive spring can contract, improving the stiffness performance of the primary vibration isolation rubber bushing.

[0016] In a second aspect, a working method of a load-bearing secondary vibration isolation suspension structure adopts the load-bearing secondary vibration isolation suspension structure described in any one of the above, and includes the following steps:

[0017] The high-voltage wire harness of the motor is fixed at the primary vibration isolation rubber bushing of the suspension skeleton through a connecting bracket. The primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing form a secondary vibration isolation structure. The vibration of the high-voltage wire harness is attenuated by the primary vibration isolation rubber bushing and then transmitted to the secondary vibration isolation rubber bushing for further attenuation, thereby improving the NVH performance of the whole vehicle. When the conductive spring is energized by the ECU, two turns of the spring are parallel to each other and the current is in the same direction, generating a magnetic field in the same direction inside the conductive spring. The adjacent springs of each turn attract each other with opposite polarities, and the spring contracts to make its stiffness adjustable to meet the vibration isolation performance requirements under different working conditions.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention provides an embedded cavity for installing the primary vibration isolation rubber bushing on the suspension skeleton, and an internal thread structure is provided in the embedded cavity, so that the connecting bracket of the high-voltage wire harness can be fixedly installed at the primary vibration isolation rubber bushing, enabling the suspension skeleton to serve as a load-bearing point for the high-voltage wire harness, improving the space utilization rate of the suspension in the engine compartment, and solving the difficulty of high-voltage wire harness layout. The internal thread is located inside the suspension skeleton body, making the installation point dynamic stiffness and reliability of the fixing bolt at this location higher. In addition, the primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing form a secondary vibration isolation structure. The vibration of the high-voltage wire harness is attenuated by the primary vibration isolation rubber bushing and then transmitted to the secondary vibration isolation rubber bushing for further attenuation, thereby improving the NVH performance of the whole vehicle.

[0020] 2. The primary vibration isolation rubber bushing of the present invention is set as a composite rubber spring structure. The conductive spring is connected to a live wire harness led out from the high-voltage wire harness. When the conductive spring is energized, two turns of the spring are parallel to each other and the current is in the same direction, generating a magnetic field in the same direction inside the spring. The adjacent springs of each turn attract each other with opposite polarities, and the spring contracts to make its stiffness adjustable. Energizing makes the conductive spring contract, and the bushing has the performance of high amplitude and high stiffness. Power-off makes the conductive spring in a free state, and the bushing has the performance of low amplitude and low stiffness, thus meeting the vibration isolation performance requirements under different working conditions. Description of the Drawings

[0021] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0022] Figure 1 is a schematic diagram of the overall structure of the load-bearing secondary vibration isolation suspension in the embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the overall structure of the primary vibration isolation rubber bushing in the embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the overall structure of the secondary vibration isolation rubber bushing in the embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the overall structure of the carrier-type secondary vibration isolation mount assembly in the embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of the vehicle assembly state of the carrier-type secondary vibration isolation mount assembly in the embodiment of the present invention.

[0027] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0028] Wherein: 1. Primary vibration isolation rubber bushing; 1-1. Outer tube of the primary vibration isolation rubber bushing; 1-2. Rubber of the primary vibration isolation rubber bushing; 1-3. Conductive spring, 1-4. Through hole; 2-1. Internal threaded hole; 2-2. Embedded cavity; 2-3. Mounting hole for the secondary vibration isolation rubber bushing; 3. Secondary vibration isolation rubber bushing; 3-1. Inner tube of the secondary vibration isolation rubber bushing; 3-2. Outer tube of the secondary vibration isolation rubber bushing; 3-3. Rubber of the secondary vibration isolation rubber bushing; 4. Mounting skeleton; 4-1. Connection hole between the mount and the subframe; 4-2. Connection hole between the mount and the motor; 4-3. Vibration isolation rubber; 5-1. Motor; 5-2. High-voltage wire harness; 5-3. Connection bracket; 5-4. Fixing bolt; 5-5. Conductive wire harness; 5-6. Subframe; 5-7. Mount assembly. Detailed implementation manners

[0029] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations for the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0030] Embodiment 1

[0031] In a typical implementation manner of the present invention, referring to Figures 1-5 as shown, a carrier-type secondary vibration isolation mount structure includes a mount assembly 5-7. The main body of the mount assembly 5-7 is a mount skeleton 4. A secondary vibration isolation structure is installed on the mount skeleton 4, and a connection bracket for fixing the high-voltage wire harness 5-2 is installed. The vibration excitation of the high-voltage wire harness 5-2 is transmitted to the secondary vibration isolation rubber bushing 3 through the primary vibration isolation rubber bushing 1, and the vibration transmission is attenuated through the secondary vibration isolation structure.

[0032] As Figure 1 shown, an embedded cavity structure is provided on the mount skeleton 4. An internal threaded hole is provided at the bottom of the embedded cavity of the mount skeleton. The embedded cavity is used for installing the primary vibration isolation rubber bushing.

[0033] Specifically, a boss structure is provided at the top of the suspension skeleton 4. An inward groove is formed at the boss to form a groove for press-fitting the primary vibration isolation rubber bushing, which serves as the embedded cavity 2-2. The internal thread hole 2-1 extends downward through the bottom surface of the embedded cavity 2-2, as shown in Figure 1 shown; by machining the embedded cavity structure, the primary vibration isolation rubber bushing 1 can be press-fitted into the embedded cavity.

[0034] The suspension skeleton 4 is also provided with a secondary vibration isolation rubber bushing mounting hole 2-3. The secondary vibration isolation rubber bushing mounting hole 2-3 is used to mount the secondary vibration isolation rubber bushing 3, so that the primary vibration isolation rubber bushing 1 and the secondary vibration isolation rubber bushing 3 jointly form a secondary vibration isolation structure. Through this secondary vibration isolation structure, the vibration transmission of the high-voltage wire harness can be attenuated twice.

[0035] As shown in Figure 2 shown, the primary vibration isolation rubber bushing 1 of this embodiment includes two layers of structures, specifically including the primary vibration isolation rubber bushing outer tube 1-1 and the primary vibration isolation rubber bushing rubber 1-2 inside the primary vibration isolation rubber bushing outer tube 1-1. A through hole 1-4 is provided inside the primary vibration isolation rubber bushing rubber 1-2. The through hole 1-4 is used to cooperate with a fastener. A conductive spring 1-3 is integrated inside the primary vibration isolation rubber bushing rubber 1-2. The conductive spring 1-3 is coaxially arranged with the primary vibration isolation rubber bushing rubber 1-2.

[0036] It can be understood that the primary vibration isolation rubber bushing outer tube 1-1, the primary vibration isolation rubber bushing rubber 1-2, and the conductive spring 1-3 are an integrally vulcanized molding structure.

[0037] As shown in Figure 3 shown, the secondary vibration isolation rubber bushing 3 includes the secondary vibration isolation rubber bushing rubber 3-3. The outer side of the secondary vibration isolation rubber bushing rubber 3-3 is the secondary vibration isolation rubber bushing outer tube 3-2, and the inner side is the secondary vibration isolation rubber bushing inner tube 3-1; a suspension and subframe connection hole 4-1 is formed inside the secondary vibration isolation rubber bushing inner tube 3-1 for cooperating with a fixing member.

[0038] It can be understood that the secondary vibration isolation rubber bushing inner tube 3-1, the secondary vibration isolation rubber bushing outer tube 3-2, and the secondary vibration isolation rubber bushing rubber 3-3 are an integrally vulcanized molding structure. The secondary vibration isolation rubber bushing 3 is also called the main spring.

[0039] In this embodiment, by providing an embedded cavity 2-2 for press-fitting the primary vibration isolation rubber bushing 1 on the suspension skeleton, compared with the traditional suspension vibration isolation structure, the primary vibration isolation rubber bushing 1 is embedded in the embedded cavity 2-2 and forms a secondary vibration isolation structure with the main spring (secondary vibration isolation rubber bushing 3). After the vibration is attenuated by the primary bushing, it is transmitted to the secondary rubber bushing for further attenuation, thereby improving the NVH performance of the whole vehicle.

[0040] As shown in Figure 1 andFigure 4 and Figure 5 As shown, three groups of mounting holes are provided on the suspension frame 4 as suspension and motor connection holes 4-2 for fixedly connecting the suspension frame 4 and the motor 5-1 through fixing bolts 5-4. And a vibration isolation rubber 4-3 is provided between the fixing bolt 5-4 and the suspension and motor connection hole 4-2 for reducing the vibration brought by the motor 5-1 to the suspension frame 4.

[0041] As Figure 4 and Figure 5 As shown, the suspension and subframe connection hole 4-1 inside the inner tube 3-1 of the secondary vibration isolation rubber bushing is used to cooperate with the fixing bolt. The fixing bolt 5-4 passes through the suspension and subframe connection hole 4-1 to realize the fixed connection between the suspension frame 4 and the subframe 5-6. The secondary vibration isolation rubber bushing 3, as a structure provided between the suspension assembly 5-7 and the subframe 5-6, can directly play a vibration damping role and reduce the vibration transmission from the suspension frame 4 to the subframe 5-6. The primary vibration isolation rubber bushing 1 can initially reduce the vibration transmission of the high-voltage harness 5-2 to the suspension frame 4.

[0042] Since a through hole 1-4 is provided inside the rubber 1-2 of the primary vibration isolation rubber bushing, the through hole 1-4 is used to cooperate with the fastener. The fastener can adopt the fixing bolt 5-4, as Figure 5 shown. One end of the connection bracket 5-3 is used to fixedly connect the high-voltage harness 5-2 of the motor 5-1, and the other end abuts against the top surface of the primary vibration isolation rubber bushing 1 and is also provided with a through hole. The fixing bolt 5-4 passes through the through hole on the connection bracket 5-3 and the through hole 1-4 on the rubber 1-2 of the primary vibration isolation rubber bushing and then cooperates with the internal thread hole to realize fixing the connection bracket on the suspension frame 4.

[0043] The end of the connection bracket 5-3 can fix the high-voltage harness in a binding form to realize the layout of the high-voltage harness at the position of the suspension frame, thereby reducing the difficulty of arranging the high-voltage harness in the engine compartment.

[0044] Since in this embodiment, the primary vibration isolation rubber bushing 1 is arranged in the embedded cavity, and the connection bracket of the high-voltage harness is arranged on the primary vibration isolation rubber bushing 1. The primary vibration isolation rubber bushing 1 and the secondary vibration isolation rubber bushing 3 form a secondary vibration isolation structure. The vibration of the high-voltage harness 5-2 is attenuated by the primary vibration isolation rubber bushing 1 and then transmitted to the secondary vibration isolation rubber bushing 3 for further attenuation, thereby improving the NVH performance of the whole vehicle. This layout form reduces the vibration influence brought by the arrangement of the high-voltage harness at the suspension, solves the difficulty of arranging the high-voltage harness, and also improves the space utilization rate of the suspension in the engine compartment.

[0045] Furthermore, as Figure 5As shown in the figure, a round hole is provided on the boss structure of the suspension skeleton 4. A set of energized wire harnesses 5-5 are led out from the high-voltage wire harness 5-2 and pass through the round hole on the boss structure to be connected to the end of the conductive spring 1-3 embedded in the cavity 2-2. One end of the conductive spring 1-3 can penetrate through the bottom of the primary vibration isolation rubber bushing 1-2 to be connected to the energized wire harness 5-5, and the switch of the current in the conductive spring can be controlled by the ECU.

[0046] The primary vibration isolation rubber bushing 1 of this embodiment is a composite rubber spring structure, and the bushing stiffness is controlled by current to meet the requirements of the suspension vibration isolation performance under different working conditions. The stiffness of the primary vibration isolation rubber bushing 1 is jointly determined by two situations. When the conductive spring 1-3 is energized, two turns of the spring are parallel to each other and the current is in the same direction. An electromagnetic field in the same direction will be generated inside the spring. The adjacent springs of each turn attract each other with opposite polarities, and the spring shrinks to make its stiffness adjustable.

[0047] The conductive spring 1-3 in the primary vibration isolation rubber bushing 1 is connected to the energized wire harness 5-5. A vibration sensor can be set outside the high-voltage wire harness. After the sensor identifies the amplitude of the high-voltage wire harness 5-2, the switch of the current in the conductive spring 1-3 can be controlled by the ECU. The method for adjusting the stiffness of the primary vibration isolation rubber bushing 1 is as follows: when the conductive spring 1-3 is energized through the energized wire harness 5-5, the conductive spring 1-3 will shrink, and the bushing has the performance of high amplitude and high stiffness. When powered off, the conductive spring 1-3 is in a free state and the bushing has the performance of low amplitude and low stiffness, so as to meet the vibration isolation performance requirements under different working conditions.

[0048] In this embodiment, by setting the embedded cavity and internal thread of the additional primary vibration isolation rubber bushing, the connection bracket 3 of the high-voltage wire harness is fixed at the primary vibration isolation rubber bushing. The primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing form a secondary vibration isolation structure, which reduces the influence brought by the vibration of the high-voltage wire harness; the suspension can be used as the bearing point of the high-voltage wire harness. Compared with the traditional engine compartment layout form, the space utilization rate of the suspension in the engine compartment is improved, and the difficulty of arranging the high-voltage wire harness is solved; at the same time, the primary vibration isolation rubber bushing adopts a composite rubber spring structure, and the bushing stiffness is controlled by current, which can meet the requirements of the suspension vibration isolation performance under different working conditions.

[0049] In this embodiment, the internal thread 2-1 of the suspension skeleton connected to the high-voltage wire harness is located inside the motor suspension skeleton body, and the installation point has higher dynamic stiffness and reliability and strong stability.

[0050] Embodiment 2

[0051] In a typical implementation manner of the present invention, refer to Figures 1-5 As shown in the figure, a working method of a load-bearing secondary vibration isolation suspension structure adopts the load-bearing secondary vibration isolation suspension structure of Embodiment 1, and includes the following steps:

[0052] When assembling the suspension assembly 5-7, after the primary vibration isolation rubber bushing 1, the suspension skeleton 4, and the secondary vibration isolation rubber bushing 3 are manufactured, first press the primary vibration isolation rubber bushing 1 into the embedding cavity 2-2 of the suspension skeleton 4, and then press the secondary vibration isolation rubber bushing 3 into the secondary vibration isolation rubber bushing mounting hole 2-3. In addition, the secondary vibration isolation rubber bushing 3 and the subframe 5-6 are connected by a fixing bolt 5-4, the suspension skeleton 4 and the motor 5-1 are connected by 3 fixing bolts, and the connection bracket 5-3 of the primary vibration isolation rubber bushing 1 and the high-voltage wire harness 5-2 is connected by a fixing bolt 5-4.

[0053] The high-voltage wire harness 5-2 of the motor 5-1 is fixed at the primary vibration isolation rubber bushing 1 of the suspension skeleton through the connection bracket 5-3. The primary vibration isolation rubber bushing 1 and the secondary vibration isolation rubber bushing 3 form a secondary vibration isolation structure. The vibration of the high-voltage wire harness 5-2 is attenuated by the primary vibration isolation rubber bushing 1 and then transmitted to the secondary vibration isolation rubber bushing 3 for further attenuation, thereby improving the NVH performance of the whole vehicle.

[0054] When the conductive spring 1-3 is energized through the ECU and the energized wire harness 5-5, the two turns of the spring are parallel to each other and the current is in the same direction, generating a magnetic field in the same direction inside the conductive spring. The adjacent springs of each turn attract each other with opposite polarities, and the spring contracts to make its stiffness adjustable, which can meet the vibration isolation performance requirements under different working conditions and achieve adjustable vibration isolation performance.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A load-bearing secondary vibration isolation suspension structure, characterized in that: include: A suspension frame, wherein an embedded cavity structure is provided on the suspension frame, an internal threaded hole is provided at the bottom of the embedded cavity, and the embedded cavity is used to install a primary vibration isolation rubber bushing; a secondary vibration isolation rubber bushing installation hole is also provided on the suspension frame, which is used to install a secondary vibration isolation rubber bushing, so that the suspension frame has a secondary vibration isolation structure; a fixing piece is used to fix the suspension frame and the subframe through the secondary vibration isolation rubber bushing; A connecting bracket has one end for fixing the high-voltage wiring harness and the other end for abutting against a primary vibration isolation rubber bushing. A fastener is passed through the primary vibration isolation rubber bushing and cooperates with the internal threaded hole to fix the connecting bracket on the suspension frame. The vibration excitation of the high-voltage wiring harness is transmitted to the secondary vibration isolation rubber bushing through the primary vibration isolation rubber bushing, and the vibration transmission is attenuated through the secondary vibration isolation structure.

2. A load-bearing secondary vibration isolation suspension structure according to claim 1, characterized in that: A boss structure is provided on the top of the suspension frame, and an inward groove at the boss forms a groove for setting a primary vibration isolation rubber bushing as an embedded cavity, and the internal threaded hole is formed by extending downward through the bottom surface of the embedded cavity.

3. A load-bearing secondary vibration isolation suspension structure according to claim 2, characterized in that: The first-level vibration isolation rubber bushing includes a two-layer structure, including a first-level vibration isolation rubber bushing outer tube and a first-level vibration isolation rubber bushing rubber inside the first-level vibration isolation rubber bushing. The first-level vibration isolation rubber bushing rubber is provided with a through hole inside for cooperating with a fastener. The structure of the first-level vibration isolation rubber bushing is formed by one-piece vulcanization.

4. The load-bearing secondary vibration isolation suspension structure according to claim 3, characterized in that: A conductive spring is integrated inside the first-level vibration isolation rubber bushing rubber, and the conductive spring is coaxially arranged with the first-level vibration isolation rubber bushing rubber; a circular hole is provided on the boss structure, and a group of live wire harnesses led out from the high-voltage wire harness pass through the circular hole and are connected to the end of the conductive spring embedded in the cavity.

5. The load-bearing secondary vibration isolation suspension structure according to claim 1, characterized in that: The suspension frame is provided with a plurality of mounting holes for connecting the suspension frame and the motor via fixing bolts, and vibration isolation rubber is provided between the fixing bolts and the mounting holes.

6. The load-bearing secondary vibration isolation suspension structure according to claim 1, characterized in that: The secondary vibration isolation rubber bushing includes a secondary vibration isolation rubber bushing rubber, the outer side of the secondary vibration isolation rubber bushing rubber is a secondary vibration isolation rubber bushing outer tube, and the inner side is a secondary vibration isolation rubber bushing inner tube; the inner side of the secondary vibration isolation rubber bushing inner tube forms a suspension and subframe connecting hole for cooperating with the fixing part.

7. The load-bearing secondary vibration isolation suspension structure according to claim 1, characterized in that: The primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing are connected to the suspension frame by press-fitting.

8. The load-bearing secondary vibration isolation suspension structure according to claim 4, characterized in that: One end of the conductive spring passes through the first-level vibration isolation rubber bushing rubber and is connected to the power harness.

9. The load-bearing secondary vibration isolation suspension structure according to claim 8, characterized in that: The switch of the current in the conductive spring can be controlled by the ECU. When the conductive spring is energized, the conductive spring can be contracted, thereby improving the stiffness performance of the primary vibration isolation rubber bushing.

10. A working method of a load-bearing secondary vibration isolation suspension structure, characterized in that: The load-bearing secondary vibration isolation suspension structure as claimed in claim 9 comprises the following steps: The high-voltage wiring harness of the motor is fixed to the primary vibration isolation rubber bushing of the suspension frame through a connecting bracket. The primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing form a secondary vibration isolation structure. The vibration of the high-voltage wiring harness is attenuated by the primary vibration isolation rubber bushing and then transmitted to the secondary vibration isolation rubber bushing for further attenuation, thereby improving the NVH performance of the entire vehicle; when the conductive spring is energized by the ECU, the two turns of the spring are parallel to each other and the current is in the same direction, and an electromagnetic field in the same direction is generated inside the conductive spring. The adjacent springs of each turn attract each other with opposite sexes, and the spring contracts to make its stiffness adjustable to meet the vibration isolation performance requirements under different working conditions.

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