A load-carrying two-stage vibration isolation suspension structure and method

Abstract

The application relates to the technical field of new energy automobile motor suspension structure, and discloses a bearing type secondary vibration isolation suspension structure and method, wherein an embedded cavity structure is arranged on a suspension framework, an inner threaded hole is arranged at the bottom of the embedded cavity, and the embedded cavity is used for mounting a primary vibration isolation rubber bushing; a secondary vibration isolation rubber bushing mounting hole is further arranged on the suspension framework and used for mounting the secondary vibration isolation rubber bushing, so that the suspension framework has a secondary vibration isolation structure; the vibration of a high-voltage wire harness is attenuated through the primary vibration isolation rubber bushing, transmitted to the secondary vibration isolation rubber bushing and attenuated again, so that the NVH performance of the whole vehicle is improved; one end of a connecting support is used for fixing the high-voltage wire harness, and the other end is used for abutting against the primary vibration isolation rubber bushing; fasteners are used for fixing the connecting support on the suspension framework by cooperating with the primary vibration isolation rubber bushing and the inner threaded hole, so that the suspension framework can be used as a bearing point of the high-voltage wire harness, and the space utilization rate of the suspension in the cabin is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle motor suspension structure, and particularly to a bearing type secondary vibration isolation suspension structure and method. BACKGROUND

[0002] With the development of new energy vehicles, the market share of new energy vehicles is continuously increasing. Compared with traditional fuel vehicles, the power output source of new energy vehicles is changed from engine to motor, and the motor operation noise is relatively low, and the vibration and noise performance requirements of the whole vehicle are higher. Generally, when arranging in the early stage, the suspension vibration isolation performance requirements are considered, and high-voltage wire harness is not arranged on the suspension, otherwise the vibration of the high-voltage wire harness will be transmitted to the subframe of the vehicle body through the suspension, affecting the NVH performance of the whole vehicle. Since the high-voltage wire harness is arranged at the suspension, the vibration influence is brought, which greatly increases the difficulty of arranging the high-voltage wire harness in the engine compartment and reduces the space utilization rate of the suspension in the engine compartment. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application aims to provide a bearing type secondary vibration isolation suspension structure and method, so that the suspension framework can be used as a bearing point for the high-voltage wire harness, thereby improving the space utilization rate of the suspension in the engine compartment. The first-stage vibration isolation rubber bushing and the second-stage vibration isolation rubber bushing form a secondary vibration isolation structure, and the vibration of the high-voltage wire harness is attenuated by the first-stage vibration isolation rubber bushing and then transmitted to the second-stage vibration isolation rubber bushing for further attenuation, thereby improving the NVH performance of the whole vehicle.

[0004] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0005] In the first aspect, a bearing type secondary vibration isolation suspension structure comprises:

[0006] A suspension framework is provided with an embedded cavity structure, an inner threaded hole is arranged at the bottom of the embedded cavity, and the embedded cavity is used for installing a first-stage vibration isolation rubber bushing. The suspension framework is also provided with a second-stage vibration isolation rubber bushing mounting hole for installing a second-stage vibration isolation rubber bushing, so that the suspension framework has a secondary vibration isolation structure. A fixing member is used to fix the suspension framework and the subframe by penetrating the second-stage vibration isolation rubber bushing.

[0007] A connecting bracket is used to fix the high-voltage wire harness at one end and abut against the first-stage vibration isolation rubber bushing at the other end. The connecting bracket is fixed on the suspension framework by cooperating the first-stage vibration isolation rubber bushing with the inner threaded hole through a fastener. The vibration excitation of the high-voltage wire harness is transmitted to the second-stage vibration isolation rubber bushing through the first-stage vibration isolation rubber bushing, and the vibration transmission is attenuated by the secondary vibration isolation structure.

[0008] As a further implementation manner, the top of the suspension frame is provided with a boss structure, and a groove is formed inward at the boss, serving as an embedding cavity, and the internal threaded hole extends downward from the bottom surface of the embedding cavity.

[0009] As a further implementation manner, the primary vibration isolation rubber bushing comprises a two-layer structure, including a primary vibration isolation rubber bushing outer tube and a primary vibration isolation rubber bushing rubber inside the primary vibration isolation rubber bushing outer tube, and a through hole is formed inside the primary vibration isolation rubber bushing rubber, used for cooperating with the fastener; the structure of the primary vibration isolation rubber bushing is integrally vulcanized and formed.

[0010] As a further implementation manner, an electrically conductive spring is integrated inside the primary vibration isolation rubber bushing rubber, and the electrically conductive spring is coaxially arranged with the primary vibration isolation rubber bushing rubber; a circular hole is arranged on the boss structure, and a group of power supply wire bundles of the high-voltage wire harness are connected to the end of the electrically conductive spring in the embedding cavity through the circular hole.

[0011] As a further implementation manner, a plurality of mounting holes are arranged on the suspension frame, used for connecting the suspension frame and the motor through fixing bolts, and vibration isolation rubber is arranged between the fixing bolts and the mounting holes.

[0012] As a further implementation manner, the secondary vibration isolation rubber bushing comprises secondary vibration isolation rubber bushing rubber, a secondary vibration isolation rubber bushing outer tube outside the secondary vibration isolation rubber bushing rubber, and a secondary vibration isolation rubber bushing inner tube inside the secondary vibration isolation rubber bushing rubber; a suspension and auxiliary frame connecting hole is formed inside the secondary vibration isolation rubber bushing inner tube, used for cooperating with the fixing part.

[0013] As a further implementation manner, the primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing are connected with the suspension frame in a press-fitting manner.

[0014] As a further implementation manner, one end of the electrically conductive spring penetrates through the primary vibration isolation rubber bushing rubber and is connected with the power supply wire bundle.

[0015] As a further implementation manner, the switch of the current in the electrically conductive spring can be controlled by an ECU, and the energization of the electrically conductive spring can make the electrically conductive spring contract, thereby improving the rigidity performance of the primary vibration isolation rubber bushing.

[0016] In a second aspect, a working method of a load-bearing type secondary vibration isolation suspension structure, which adopts any of the load-bearing type secondary vibration isolation suspension structures described above, comprises the following steps:

[0017] The high-voltage wire harness of the motor is fixed at the first-stage vibration isolation rubber bushing of the suspension framework through a connecting support, the first-stage vibration isolation rubber bushing and the second-stage vibration isolation rubber bushing form a two-stage vibration isolation structure, the vibration of the high-voltage wire harness is attenuated through the first-stage vibration isolation rubber bushing and then transmitted to the second-stage vibration isolation rubber bushing to be attenuated again, so that the NVH performance of the whole vehicle is improved; when the ECU electrifies the conductive spring, the two turns of the spring are parallel to each other and the current is in the same direction, a same-direction electromagnetic field is generated in the conductive spring, the springs of each turn are attracted to each other, and the stiffness of the spring is adjustable due to the contraction of the spring, so that the vibration isolation performance requirement under different working conditions is met.

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

[0019] 1. The present application provides an embedded cavity for installing a first-stage vibration isolation rubber bushing on the suspension framework, and an internal thread structure is arranged in the embedded cavity, so that the connecting support of the high-voltage wire harness can be fixedly installed at the first-stage vibration isolation rubber bushing, so that the suspension framework can serve as a bearing point of the high-voltage wire harness, the space utilization rate of the suspension in the cabin is improved, and the difficulty of arranging the high-voltage wire harness is solved; the internal thread is located inside the body of the suspension framework, so that the mounting point of the fixing bolt at this position has higher dynamic stiffness and reliability; in addition, the first-stage vibration isolation rubber bushing and the second-stage vibration isolation rubber bushing form a two-stage vibration isolation structure, the vibration of the high-voltage wire harness is attenuated through the first-stage vibration isolation rubber bushing and then transmitted to the second-stage vibration isolation rubber bushing to be attenuated again, so that the NVH performance of the whole vehicle is improved.

[0020] 2. The first-stage vibration isolation rubber bushing is provided as a composite rubber spring structure, a conductive spring is connected with a power supply wire bundle led out from the high-voltage wire harness, when the conductive spring is electrified, the two turns of the spring are parallel to each other and the current is in the same direction, a same-direction electromagnetic field is generated in the spring, the springs of each turn are attracted to each other, and the stiffness of the spring is adjustable due to the contraction of the spring, the conductive spring is contracted by electrification, the bushing has a large-amplitude high-stiffness performance, the conductive spring is in a free state by de-energization, the bushing has a small-amplitude low-stiffness performance, and thus the vibration isolation performance requirement under different working conditions is met. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings constituting a part of the specification of the present application serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof serve to explain the present application and do not constitute an improper limitation on the present application.

[0022] Figure 1 is the overall structure diagram of the bearing type two-stage vibration isolation suspension in the embodiment of the present application;

[0023] Figure 2 is the overall structure diagram of the first-stage vibration isolation rubber bushing in the embodiment of the present application;

[0024] Figure 3 is the overall structure diagram of the second-stage vibration isolation rubber bushing in the embodiment of the present application;

[0025] Figure 4 is the overall structure schematic diagram of the carrying type two-stage vibration isolation suspension assembly in the embodiment of the present application;

[0026] Figure 5 is the overall vehicle assembly state schematic diagram of the carrying type two-stage vibration isolation suspension assembly in the embodiment of the present application.

[0027] In the figure: the mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only illustrative.

[0028] Among them: 1, a primary vibration isolation rubber bushing; 1-1, a primary vibration isolation rubber bushing outer tube; 1-2, a primary vibration isolation rubber bushing rubber; 1-3, a conductive spring, 1-4. A through hole; 2-1, an internal threaded hole; 2-2, an embedded cavity; 2-3, a two-stage vibration isolation rubber bushing mounting hole; 3, a two-stage vibration isolation rubber bushing; 3-1, a two-stage vibration isolation rubber bushing inner tube; 3-2, a two-stage vibration isolation rubber bushing outer tube; 3-3, a two-stage vibration isolation rubber bushing rubber; 4, a suspension framework; 4-1, a suspension and subframe connecting hole; 4-2, a suspension and motor connecting hole; 4-3, a vibration isolation rubber; 5-1, a motor; 5-2, a high-voltage wire harness; 5-3, a connecting bracket; 5-4, a fixing bolt; 5-5, a power supply wire harness; 5-6, a subframe; 5-7, a suspension assembly. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0030] Example one

[0031] In a typical embodiment of the present application, referring to Figures 1-5 , a carrying type two-stage vibration isolation suspension structure includes a suspension assembly 5-7, the main body of the suspension assembly 5-7 is a suspension framework 4, a two-stage vibration isolation structure is installed on the suspension framework 4, and a connecting bracket for fixing a high-voltage wire harness 5-2 is installed, the vibration excitation of the high-voltage wire harness 5-2 is transmitted to the two-stage vibration isolation rubber bushing 3 through the primary vibration isolation rubber bushing 1, and the vibration transmission is attenuated through the two-stage vibration isolation structure.

[0032] As shown in Figure 1 , the suspension framework 4 is provided with an embedded cavity structure, an internal threaded hole is arranged at the bottom of the suspension framework embedded cavity, and the embedded cavity is used for installing the primary vibration isolation rubber bushing.

[0033] Specifically, a boss structure is arranged at the top of the suspension frame 4, and a recess is formed in the boss for press-fitting a first-stage vibration isolation rubber bushing, serving as an embedded cavity 2-2, and the internal threaded hole 2-1 extends downward from the bottom surface of the embedded cavity 2-2, as shown in Figure 1 ; by processing the embedded cavity structure, the first-stage vibration isolation rubber bushing 1 can be press-fitted in the embedded cavity.

[0034] The suspension frame 4 is further provided with a second-stage vibration isolation rubber bushing mounting hole 2-3 for mounting a second-stage vibration isolation rubber bushing 3, so that the first-stage vibration isolation rubber bushing 1 and the second-stage vibration isolation rubber bushing 3 together form a second-stage vibration isolation structure, and the vibration of the high-voltage wire harness can be attenuated twice through the second-stage vibration isolation structure.

[0035] As shown in Figure 2 , the first-stage vibration isolation rubber bushing 1 of the embodiment includes a two-layer structure, specifically including a first-stage vibration isolation rubber bushing outer tube 1-1 and a first-stage vibration isolation rubber bushing rubber 1-2 inside the first-stage vibration isolation rubber bushing outer tube 1-1, a through hole 1-4 is arranged inside the first-stage vibration isolation rubber bushing rubber 1-2, the through hole 1-4 is used for cooperating with a fastener, a conductive spring 1-3 is integrated in the inside of the first-stage vibration isolation rubber bushing rubber 1-2, and the conductive spring 1-3 is coaxially arranged with the first-stage vibration isolation rubber bushing rubber 1-2.

[0036] It can be understood that the first-stage vibration isolation rubber bushing outer tube 1-1, the first-stage vibration isolation rubber bushing rubber 1-2 and the conductive spring 1-3 are integrally vulcanized and formed.

[0037] As shown in Figure 3 , the second-stage vibration isolation rubber bushing 3 includes a second-stage vibration isolation rubber bushing rubber 3-3, the outside of the second-stage vibration isolation rubber bushing rubber 3-3 is a second-stage vibration isolation rubber bushing outer tube 3-2, and the inside is a second-stage vibration isolation rubber bushing inner tube 3-1; a suspension and sub-frame connecting hole 4-1 is formed in the inside of the second-stage vibration isolation rubber bushing inner tube 3-1, and is used for cooperating with a fixing member.

[0038] It can be understood that the second-stage vibration isolation rubber bushing inner tube 3-1, the second-stage vibration isolation rubber bushing outer tube 3-2 and the second-stage vibration isolation rubber bushing rubber 3-3 are integrally vulcanized and formed, and the second-stage vibration isolation rubber bushing 3 is also called a main spring.

[0039] By arranging the embedded cavity 2-2 for press-fitting the first-stage vibration isolation rubber bushing 1 on the suspension frame, compared with the traditional suspension vibration isolation structure, the first-stage vibration isolation rubber bushing 1 is embedded in the embedded cavity 2-2, and a second-stage vibration isolation structure is formed with the main spring (the second-stage vibration isolation rubber bushing 3), the vibration is attenuated by the first-stage bushing and then transmitted to the second-stage rubber bushing for further attenuation, thereby improving the NVH performance of the whole vehicle.

[0040] As shown in Figure 1 ,Figure 4 and Figure 5 As shown, the suspension frame 4 has three sets of mounting holes, which serve as connection holes 4-2 between the suspension and the motor. These holes are used to fix the suspension frame 4 and the motor 5-1 together with fixing bolts 5-4. Vibration damping rubber 4-3 is provided between the fixing bolts 5-4 and the connection holes 4-2 between the suspension and the motor to reduce the vibration caused by the motor 5-1 to the suspension frame 4.

[0041] like Figure 4 and Figure 5 As shown, the mounting and subframe connection hole 4-1 on the inner side of the secondary vibration isolation rubber bushing inner tube 3-1 is used to mate with the fixing bolt. The fixing bolt 5-4 passes through the mounting and subframe connection hole 4-1 to achieve a fixed connection between the mounting frame 4 and the subframe 5-6. The secondary vibration isolation rubber bushing 3, as a structure located between the mounting assembly 5-7 and the subframe 5-6, can directly play a vibration reduction role, reducing the vibration transmission from the mounting frame 4 to the subframe 5-6. The primary vibration isolation rubber bushing 1 can initially reduce the vibration transmission from the high-voltage wiring harness 5-2 to the mounting frame 4.

[0042] Because the inner side of the primary vibration isolation rubber bushing 1-2 has a through hole 1-4, the through hole 1-4 is used to mate with a fastener, and the fastener can be a fixing bolt 5-4, such as... Figure 5 As shown. One end of the connecting bracket 5-3 is used to fix the high voltage wire 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 connecting bracket 5-3 and the through hole 1-4 on the primary vibration isolation rubber bushing rubber 1-2 and then engages with the internal thread hole to fix the connecting bracket on the suspension frame 4.

[0043] The high-voltage wiring harness can be fixed at the end of the connecting bracket 5-3 by binding, so that the high-voltage wiring harness can be arranged at the position of the suspension frame, thereby reducing the difficulty of arranging the high-voltage wiring harness in the cabin.

[0044] In this embodiment, a primary vibration isolation rubber bushing 1 is installed in the embedded cavity, and the connecting bracket of the high-voltage wiring 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 wiring 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 arrangement reduces the vibration impact caused by the high-voltage wiring harness being arranged at the suspension, solves the difficulty of high-voltage wiring harness arrangement, and also improves the space utilization rate of the suspension in the engine compartment.

[0045] Furthermore, such as Figure 5As shown, the boss structure of the suspension frame 4 is provided with a round hole, the high-voltage wire harness 5-2 leads a group of power supply wire harnesses 5-5 to pass through the round hole on the boss structure and connect with the end of the conductive spring 1-3 embedded in the cavity 2-2, wherein one end of the conductive spring 1-3 can penetrate through the bottom of the first-stage vibration isolation rubber bushing rubber 1-2 and be connected with the power supply wire harness 5-5, and the switch of the current in the conductive spring can be controlled by the ECU.

[0046] The first-stage vibration isolation rubber bushing 1 of the embodiment is a composite rubber spring structure, and the bushing stiffness is controlled by current to meet the suspension vibration isolation performance requirements under different working conditions. The stiffness of the first-stage vibration isolation rubber bushing 1 is determined by two conditions. When the conductive spring 1-3 is powered, the two turns of the spring are parallel to each other and the current is in the same direction, and a same-direction electromagnetic field is generated in the spring. The adjacent springs of each turn attract each other, and the stiffness of the spring is adjustable.

[0047] The conductive spring 1-3 in the first-stage vibration isolation rubber bushing 1 is connected with the power supply wire harness 5-5, and a vibration sensor can be arranged 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 stiffness adjustment mode of the first-stage vibration isolation rubber bushing 1 is as follows: when the conductive spring 1-3 is powered through the power supply wire harness 5-5, the conductive spring 1-3 will contract, the bushing has large-amplitude high-stiffness performance, and when the power is off, the free-state conductive spring 1-3 has small-amplitude low-stiffness performance, thereby meeting the vibration isolation performance requirements under different working conditions.

[0048] In the embodiment, the embedded cavity and the internal thread of the first-stage vibration isolation rubber bushing are additionally arranged, the connection bracket 3 of the high-voltage wire harness is fixed at the first-stage vibration isolation rubber bushing, the first-stage vibration isolation rubber bushing and the second-stage vibration isolation rubber bushing form a second-stage vibration isolation structure, and the influence of the vibration of the high-voltage wire harness is reduced. The suspension can serve as a bearing point of the high-voltage wire harness, compared with the traditional cabin arrangement form, the space utilization rate of the suspension in the cabin is improved, and the difficulty of the arrangement of the high-voltage wire harness is solved. Meanwhile, the first-stage vibration isolation rubber bushing adopts a composite rubber spring structure, the bushing stiffness is controlled by current, and the suspension vibration isolation performance requirements under different working conditions can be met.

[0049] In the embodiment, the internal thread 2-1 of the suspension frame connected with the high-voltage wire harness is located in the motor suspension frame body, the mounting point has higher rigidity, higher reliability and stronger stability.

[0050] Embodiment two

[0051] In a typical embodiment of the present application, referring to Figures 1-5 As shown, a working method of a bearing type second-stage vibration isolation suspension structure adopts the bearing type second-stage vibration isolation suspension structure of embodiment one, and includes the following steps:

[0052] In the assembly of the suspension assembly 5-7, after the primary vibration isolation rubber bushing 1, the suspension frame 4 and the secondary vibration isolation rubber bushing 3 are manufactured, the primary vibration isolation rubber bushing 1 is first pressed into the embedding cavity 2-2 of the suspension frame 4, and then the secondary vibration isolation rubber bushing 3 is pressed 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 frame 4 and the motor 5-1 are connected by three fixing bolts, and the primary vibration isolation rubber bushing 1 and the connection support 5-3 of the high-voltage wire harness 5-2 are connected by a fixing bolt 5-4.

[0053] The high-voltage wire harness 5-2 of the motor 5-1 is fixed to the primary vibration isolation rubber bushing 1 of the suspension frame by the connection support 5-3, the primary vibration isolation rubber bushing 1 and the secondary vibration isolation rubber bushing 3 form a secondary vibration isolation structure, and 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 attenuation again, thereby improving the NVH performance of the whole vehicle.

[0054] When the ECU and the power-on wire harness 5-5 are powered on, the two turns of springs are parallel to each other and the current is in the same direction, generating a same-direction electromagnetic field inside the conductive spring, and the adjacent springs of each turn attract each other, and the stiffness of the spring can be adjusted by the contraction of the spring, so as to meet the vibration isolation performance requirements under different working conditions and realize adjustable vibration isolation performance.

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

Claims

1. A load-carrying two-stage vibration isolation suspension structure, characterized by, The application relates to a bearing type secondary vibration isolation suspension structure. The suspension frame is provided with an embedded cavity structure, an inner threaded hole is arranged at the bottom of the embedded cavity, and the embedded cavity is used for mounting a primary vibration isolation rubber bushing; the suspension frame is also provided with a secondary vibration isolation rubber bushing mounting hole used for mounting a secondary vibration isolation rubber bushing, so that the suspension frame has a secondary vibration isolation structure; a fixing member is used for fixing the suspension frame and the auxiliary frame by penetrating the secondary vibration isolation rubber bushing. One end of the connecting support is used for fixing a high-voltage wire harness, and the other end is used for abutting against the primary vibration isolation rubber bushing; the connecting support is fixed on the suspension frame by penetrating the primary vibration isolation rubber bushing and cooperating with the inner threaded hole, vibration excitation of the high-voltage wire harness is transmitted to the secondary vibration isolation rubber bushing through the primary vibration isolation rubber bushing, and vibration transmission is attenuated through the secondary vibration isolation structure.

2. The load-carrying two-stage vibration isolation suspension structure according to claim 1, characterized in that, The top of the suspension frame is provided with a boss structure, an inward groove is formed at the boss to form a groove for arranging the primary vibration isolation rubber bushing, and the groove is used as the embedded cavity; the inner threaded hole extends downward through the bottom surface of the embedded cavity.

3. The load-carrying two-stage vibration isolation suspension structure according to claim 2, characterized in that The primary vibration isolation rubber bushing comprises two layers of structures, including a primary vibration isolation rubber bushing outer tube and primary vibration isolation rubber bushing rubber inside the outer tube; a through hole is arranged at the inner side of the primary vibration isolation rubber bushing rubber and used for cooperating with a fastener; the structure of the primary vibration isolation rubber bushing is integrally vulcanized and formed.

4. The load-carrying two-stage vibration isolation suspension structure according to claim 3, characterized in that The primary vibration isolation rubber bushing rubber is internally integrated with a conductive spring which is coaxially arranged with the primary vibration isolation rubber bushing rubber; a circular hole is arranged on the boss structure; a group of power supply wire harnesses of the high-voltage wire harness are led out and connected with the end of the conductive spring in the embedded cavity.

5. The load-carrying two-stage vibration isolation suspension structure of claim 1, wherein, A plurality of mounting holes are arranged on the suspension frame and used for connecting the suspension frame and a motor through fixing bolts; vibration isolation rubber is arranged between the fixing bolts and the mounting holes.

6. The load-carrying two-stage vibration isolation suspension structure of claim 1, wherein, The secondary vibration isolation rubber bushing comprises secondary vibration isolation rubber bushing rubber, a secondary vibration isolation rubber bushing outer tube at the outer side of the secondary vibration isolation rubber bushing rubber, and a secondary vibration isolation rubber bushing inner tube at the inner side of the secondary vibration isolation rubber bushing rubber; a suspension and auxiliary frame connecting hole is formed at the inner side of the secondary vibration isolation rubber bushing inner tube and used for cooperating with the fixing member.

7. The load-carrying two-stage vibration isolation suspension structure of claim 1, wherein The primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing are connected with the suspension frame in a press-fitting mode.

8. The load-carrying two-stage vibration isolation suspension structure of claim 4, wherein, One end of the conductive spring penetrates the primary vibration isolation rubber bushing rubber and is connected with the power supply wire harness.

9. The load-carrying two-stage vibration isolation suspension structure according to claim 8, characterized by The switch of the current in the conductive spring can be controlled by an ECU; the conductive spring is contracted when the conductive spring is powered on, so that the rigidity performance of the primary vibration isolation rubber bushing is improved.

10. A method of operating a load-carrying two-stage vibration isolation suspension structure, characterized by The bearing type secondary vibration isolation suspension structure is used in the following steps. The high-voltage wire harness of the motor is fixed at the primary vibration isolation rubber bushing of the suspension frame through the connecting support; the primary vibration isolation rubber bushing and the secondary vibration isolation rubber bushing form a secondary vibration isolation structure; vibration of the high-voltage wire harness is attenuated through the primary vibration isolation rubber bushing and then transmitted to the secondary vibration isolation rubber bushing to be attenuated again, so that the NVH performance of the whole vehicle is improved; when the conductive spring is powered on through the ECU, two turns of the spring are parallel to each other and the current is in the same direction; a same-direction electromagnetic field is generated in the conductive spring; the springs of each turn are attracted to each other due to their different natures; the rigidity of the spring is adjustable due to the contraction of the spring, so that the vibration isolation performance requirement under different working conditions is met.

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