A front-wheel drive suspension system and its assembly method

Abstract

This invention relates to the field of automotive mounting systems, specifically a front-wheel drive mounting system and its assembly method, comprising an electric drive unit frame assembly, wherein the electric drive unit frame assembly includes a support frame; the support frame is assembled from square steel; this invention discloses a front-wheel drive mounting system, which reduces the development cost of the support frame. In addition, this invention forms the support frame by assembling square steel, which is easy to manufacture, has easy precision control, and also has the advantages of being lightweight and low-cost.

Description

Technical Field

[0001] This invention relates to the field of automotive mounting systems, specifically a front-wheel drive mounting system and its assembly method. Background Technology

[0002] The integrated motor structure used in new energy vehicles is generally smaller than that of traditional fuel engines. If the suspension brackets are still installed on the longitudinal beams of the vehicle body as in fuel vehicles, the lateral span of the suspension brackets will be large, resulting in larger size, heavier weight, higher cost, and difficulty in ensuring strength. In addition, the front compartment of existing vehicles needs to accommodate high and low voltage electrical appliances or pipelines, cooling water pumps, and other components, but there are no fixed points available.

[0003] There are currently two solutions to this problem:

[0004] First, a frame-type subframe is adopted; the motor is directly connected and fixed to the front crossbeam of the frame-type subframe. Although this connection method can achieve the installation of an integrated motor, it will increase the number and complexity of the subframe molds, and the production cost and the unit cost of the product will rise sharply.

[0005] Second, an electric drive unit frame assembly is added to the front compartment, which is connected to the left and right longitudinal beams of the vehicle body and provides a closer mounting point for the suspension. The integrated motor is connected to the suspension bracket and then hoisted onto the aforementioned electric drive unit frame assembly.

[0006] The solution using the electric drive unit frame assembly has excellent performance.

[0007] However, the following problems may still exist in actual implementation:

[0008] 1. The electric drive unit frame assembly is made of aluminum material by gravity casting. The advantages of this structure are that the product is lightweight, has high modulus, high machining accuracy, and does not require anti-corrosion treatment. However, it also has the disadvantage of higher cost due to the need to develop casting molds, high unit price of aluminum material, and the need for post-processing of installation points.

[0009] 2. The electric drive unit frame assembly is formed by stamping and welding, and the surface is treated with electrophoretic black paint for corrosion protection. It has a lower cost than the cast aluminum structure, but the disadvantages of heavy weight and high mold cost are also obvious.

[0010] For example, patent CN201821902433.6 describes a powertrain load-bearing structure, and CN201810130439.4 describes a suspension system and an electric vehicle.

[0011] Therefore, it is necessary to optimize the design of the existing electric drive unit frame assembly and provide a drive unit frame assembly that is low-cost and easy to manufacture. Summary of the Invention

[0012] The purpose of this invention is to provide a low-cost and easy-to-manufacture electric drive unit frame assembly.

[0013] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0014] A front-wheel drive suspension system includes an electric drive unit frame assembly.

[0015] The electric drive unit frame assembly includes a support frame; the support frame is assembled from square steel.

[0016] The support frame includes two longitudinal square steels, and multiple connecting square steels are provided between the two longitudinal square steels; multiple mounting threaded holes are provided on the longitudinal square steels and the connecting square steels; and mounting connection holes are provided at the ends of the longitudinal square steels.

[0017] The electric drive unit frame assembly is provided with a soft pad assembly; the soft pad assembly includes a welding bracket, the welding bracket is connected to a support arm, and the support arm is provided with die-cast bolts.

[0018] The die-cast bolts are embedded inside the support arm; the support arm is provided with a limiting protrusion.

[0019] The welding bracket includes a connecting sleeve, with connecting side plates on both sides of the connecting sleeve and an end side plate at the end of the connecting sleeve. The vertical cross-section of the connecting side plate and the end side plate is inverted L-shaped. The end side plate and the connecting side plate are connected to the support frame.

[0020] The drive unit frame assembly is provided with two soft pad assemblies. One soft pad assembly is connected to the left suspension bracket assembly, and the other soft pad assembly is connected to the right suspension bracket assembly.

[0021] The front-drive suspension system also includes a rear suspension cushion assembly; the rear suspension cushion assembly includes a rear suspension frame; and a second connecting portion is provided within the rear suspension frame.

[0022] The rear suspension frame is provided with anti-collision pads on its sides; the anti-collision pads are arranged on the second connection part and the sides of the rear suspension frame.

[0023] A method for assembling a front-wheel drive suspension system, the assembly method comprising the following steps:

[0024] Step 1: Identify the components of the front-wheel drive suspension system;

[0025] Step 2: After completing Step 1, two soft pad assemblies are set on the electric drive unit frame assembly to form the first sub-assembly assembly; at the same time, the left suspension bracket assembly, the right suspension bracket assembly, and the rear suspension soft pad assembly are assembled with the corresponding integrated motor to form the second sub-assembly assembly.

[0026] Step 3: After completing Step 2, assemble the first sub-assembly and the second sub-assembly together; at this point, the assembly of a front-drive suspension system is complete.

[0027] After step 3 is completed, the front-wheel drive suspension system is then assembled onto the vehicle through the mounting connection holes.

[0028] The advantages of this invention are:

[0029] This invention discloses a front-drive suspension system. This invention reduces the development cost of the support frame. In addition, this invention forms the support frame by assembling square steel, which is easy to produce and has easy precision control. It also has the advantages of being lightweight and low-cost. Attached Figure Description

[0030] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0031] Figure 1 This is a schematic diagram of the front-wheel drive suspension system structure and assembly;

[0032] Figure 2 This is a schematic diagram of the electric drive unit frame assembly structure;

[0033] Figure 3 This is a schematic diagram of the left (right) suspension cushion assembly structure;

[0034] Figure 4 This is a schematic diagram showing the fit between the die-cast bolts of the left (right) suspension pad assembly and the bracket.

[0035] Figure 5 This is a schematic diagram of the cross-section of the inner tube of the left (right) suspension cushion assembly and the rubber main spring.

[0036] Figure 6 This is a schematic diagram showing the assembly and limiting of the left (right) suspension cushion assembly arm and inner tube;

[0037] Figure 7 This is a schematic diagram of the assembly of the left suspension cushion assembly and the left suspension bracket;

[0038] Figure 8 This is a schematic diagram of the assembly of the right suspension cushion assembly and the right suspension bracket;

[0039] Figure 9 This is a schematic diagram of the rear suspension cushion assembly structure;

[0040] The diagram is marked as follows:

[0041] 1. Electric drive unit frame assembly; 2. Left suspension soft pad assembly; 3. Left suspension bracket assembly; 4. Right suspension soft pad assembly; 5. Right suspension bracket assembly; 6. Rear suspension soft pad assembly; 2-1. Die-cast bolt; 2-2. Support arm; 2-3. First inner tube; 2-4. First rubber main spring; 2-5. First outer tube; 2-6. Welded bracket; 6-1. Rear suspension soft frame; 6-2. Second inner tube; 6-3. Second rubber main spring; 6-4. Second outer tube; 6-5. Anti-collision pad. Detailed Implementation

[0042] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0043] A front-drive suspension system includes an electric drive unit frame assembly 1, wherein the electric drive unit frame assembly 1 includes a support frame 10-10; the support frame 10-10 is assembled from square steel. This invention discloses a front-drive suspension system. This invention reduces the development cost of the support frame 10-10. In addition, this invention forms the support frame 10-10 by assembling square steel, which is easy to produce, has easy precision control, and also has the advantages of light weight and low cost.

[0044] Specifically, the front-drive suspension system disclosed in this invention mainly includes an electric drive unit frame assembly 1. In this invention, the electric drive unit frame assembly 1 includes a support frame 10-10. The support frame 10-10 is assembled from square steel. Based on this configuration, the electric drive unit frame assembly 1 disclosed in this invention has a simple structure, is easy to manufacture, has easily controllable precision, is lightweight, and has low cost.

[0045] Furthermore, in this invention, the support frame 10-10 includes two longitudinal square steels 10-1, which form the main structure of the support frame 10-10, ensuring the overall structural strength of the support frame 10-10. Additionally, in this invention, multiple connecting square steels 10-2 are provided between the two longitudinal square steels 10-1 for connection. The connecting square steels 10-2 serve two purposes: increasing the overall structural strength of the support frame 10-10 and facilitating the connection between the two longitudinal square steels 10-1. Furthermore, in this invention, the longitudinal square steels 10-1 and the connecting square steels 10-2 are provided with multiple mounting threaded holes. The mounting threaded holes facilitate the subsequent connection between the support frame 10-10 and the soft pad assembly 4-2. Additionally, in this invention, the ends of the longitudinal square steels 10-1 are provided with mounting connection holes. The mounting connection holes facilitate the subsequent connection of the front-wheel drive suspension system to the vehicle.

[0046] Furthermore, the electric drive unit frame assembly 1 in this invention is provided with a soft pad assembly 4-2. The soft pad assembly 4-2 facilitates the connection between the integrated motor and the support frame 10-10, thereby facilitating the subsequent assembly operation of the integrated motor. In addition, the soft pad assembly 4-2 in this invention includes a welding bracket 2-6. The welding bracket 2-6 facilitates the connection between the soft pad assembly 4-2 and the support frame 10-10. At the same time, the welding bracket 2-6 in this invention is connected to a support arm 2-2, which acts as a bridge, facilitating the subsequent connection of the left and right suspension brackets. Meanwhile, the support arm 2-2 in this invention is provided with a die-cast bolt 2-1. The die-cast bolt 2-1 facilitates the subsequent connection between the soft pad assembly 4-2 and the left suspension bracket assembly 3 or the right suspension bracket assembly 5.

[0047] Furthermore, in this invention, the die-cast bolt 2-1 is embedded inside the support arm 2-2; this arrangement facilitates the connection between the die-cast bolt 2-1 and the support arm 2-2. In addition, in this invention, the support arm 2-2 is provided with a limiting protrusion 2-21; the limiting protrusion 2-21 plays a good limiting role and can limit and position the relative position of the first connecting part 21-12 and the support arm 2-2.

[0048] Furthermore, in this invention, the welding bracket 2-6 includes a connecting sleeve 2-61, which is a complete assembly, facilitating the subsequent assembly of the first connecting part 21-12 and the support arm 2-2 within the connecting sleeve 2-61. Additionally, as a further optimization, the connecting sleeve 2-61 is provided with connecting side plates 2-62 on both sides. The two connecting side plates 2-62 serve as a good bridge, facilitating the connection between the longitudinal square steel 10-1 and the welding. Simultaneously, an end side plate 2-63 is provided at the end of the connecting sleeve 2-61. The vertical cross-section of the connecting side plate 2-62 and the end side plate 2-63 is inverted L-shaped. The end side plate 2-63 and the connecting side plate 2-62 are connected to the support frame 10-10; the end side plate 2-63 is connected to the connecting square steel 10-2. Based on this arrangement, there are multiple connections between the support frame 10-10 and the welding bracket 2-6, greatly ensuring the connection stability between the welding bracket 2-6 and the support frame 10-10.

[0049] Furthermore, the drive unit frame assembly described in this invention is provided with two soft pad assemblies 4-2. One soft pad assembly 4-2 is connected to the left suspension bracket assembly 3, and the other soft pad assembly 4-2 is connected to the right suspension bracket assembly 5. Through the above design, in subsequent use, one soft pad assembly 4-2 is connected to one end of the integrated motor through the left suspension bracket assembly 3, and the other soft pad assembly 4-2 is connected to the other end of the integrated motor through the right suspension bracket assembly 5. Through this arrangement, a stable connection between the integrated motor and the support frame 10-10 can be achieved.

[0050] Furthermore, the front-wheel drive suspension system in this invention also includes a rear suspension soft pad assembly 6; the rear suspension soft pad assembly 6 includes a rear suspension frame 6-1; the rear suspension frame is provided with a second connecting part; in this invention, the rear suspension soft pad assembly 6 is also a connecting structure; it is mainly used for the connection between the subframe and the integrated motor.

[0051] Furthermore, in this invention, the rear suspension frame 6-1 is provided with a crash pad 6-5 on its side; the crash pad 6-5 is arranged on the side of the second connecting part and the rear suspension frame 6-1; the crash pad 6-5 here plays a good protective role; and avoids interference between the rear suspension frame 6-1 and adjacent components when it is used later.

[0052] A method for assembling a front-wheel drive suspension system, the assembly method comprising the following steps:

[0053] Step 1: Identify the components of the front-wheel drive suspension system;

[0054] Step 2: After completing Step 1, two soft pad assemblies 4-2 are set on the electric drive unit frame assembly 1 to form the first sub-assembly assembly; at the same time, the left suspension bracket assembly 3, the right suspension bracket assembly 5 and the rear suspension soft pad assembly 6 are assembled with the corresponding integrated motor to form the second sub-assembly assembly.

[0055] Step 3: After completing Step 2, assemble the first sub-assembly and the second sub-assembly together; at this point, the assembly of a front-drive suspension system is complete.

[0056] The present invention facilitates the assembly of the front-drive suspension system through the above assembly method.

[0057] Furthermore, after step 3 of the present invention is completed, the front-wheel drive mounting system is then assembled onto the vehicle through the mounting connection holes; this assembly method facilitates the connection and assembly of the front-wheel drive mounting system onto the vehicle.

[0058] specific:

[0059] The present invention discloses a front-drive suspension system, which includes an electric drive unit frame assembly 1, a left suspension cushion assembly 3, a left suspension bracket assembly 3, a right suspension cushion assembly 4, a right suspension bracket assembly 5, and a rear suspension cushion assembly 6.

[0060] In practical implementation:

[0061] The invention requires that the left suspension pad assembly 3 and the right suspension pad assembly 4 be connected and fixed to the welded threaded mounting steel sleeve on the electric drive unit frame assembly 1 by bolts passing through the mounting holes thereon;

[0062] Simultaneously, bolts are passed through the mounting holes on the left suspension bracket assembly 3, the right suspension bracket assembly 5, and the rear suspension pad assembly 6 to connect and fix them to the integrated motor to be installed, forming a whole;

[0063] The bolts pre-drilled on the left suspension soft pad assembly 3 and right suspension soft pad assembly 4 of the sub-assembly obtained in the first step are passed through the mounting holes of the left suspension bracket assembly 3 and right suspension bracket assembly 5 of the sub-assembly obtained in the second step. Then, nuts are used to connect and fix the left and right suspension soft pad assemblies 4 and the left and right suspension bracket assemblies 5 from below, so that the above six components and the integrated motor form an assembly.

[0064] Finally, the final assembly is placed on the left and right longitudinal beams of the front body, and is connected and fixed to the body longitudinal beams by four bolts passing through the sleeves welded at the four corners of the electric drive unit frame assembly 1. Then, the rear suspension pad assembly 6 is connected and fixed to the suspension mounting bracket welded on the rear subframe by bolts and nuts. Thus, the front drive suspension system and motor are assembled.

[0065] Due to the vibration isolation requirements of the suspension system, the damping material must be an elastic rubber material;

[0066] Based on the above design, the front-wheel drive suspension system disclosed in this invention solves the problem of not being able to design a suspension when the front compartment space is large but the subframe is difficult to develop. Furthermore, the front-wheel drive suspension system disclosed in this invention has a compact overall structure, is lightweight, and its strength is easily guaranteed. In practical implementation, the front-wheel drive suspension system, along with the integrated motor, can be integrated into the production line, improving final assembly efficiency. Additionally, the support frame 10-10 in the electric drive unit frame assembly 1 of this invention is assembled from square steel, making the electric drive unit frame assembly 1 simple in structure, easy to manufacture, with easily controllable precision, lightweight, and low cost. At the same time, the support frame 10-10 in this invention is equipped with multiple... Each connection point provides an installation point for high and low voltage electrical appliances or piping components, cooling water pumps, and other parts arranged in the front compartment during subsequent use. Furthermore, in this invention, the left and right suspensions are essentially the same soft pad assembly 4-2, arranged symmetrically. This arrangement allows the left suspension soft pad assembly 3 and the right suspension soft pad assembly 4 disclosed in this invention to be interchangeable, saving on production costs such as mold development and product management, and reducing unit costs. The left suspension soft pad assembly 3 or the right suspension soft pad assembly 4 disclosed in this invention are the same as the aforementioned soft pad assembly 4-2. The different names for the left suspension soft pad assembly 3 and the right suspension soft pad assembly 4 are simply due to the different arrangement positions of the soft pad assembly 4-2.

[0067] Specifically, the front-drive suspension system disclosed in this invention mainly includes an electric drive unit frame assembly 1, a soft pad assembly 4-2 (which can be referred to as the right suspension soft pad assembly 4 and the left suspension soft pad assembly 3 respectively, depending on the arrangement position), a left suspension bracket assembly 3, a right suspension bracket assembly 5, and a rear suspension soft pad assembly 6.

[0068] The electric drive unit frame assembly 1 includes a support frame 10-10, which consists of square steel of different specifications forming a crossbeam (connecting square steel 10-2) and a longitudinal beam (longitudinal square steel 10-1), a battery mounting bracket, and a water pump bracket formed by welding small bent parts. It is equipped with different types of connection holes 101 for wiring harness clip installation and fixing, embedded rivet nuts or rivet studs for installation and fixing of electrical components or thermal management parts, and welded threaded steel sleeves for installation and fixing of the left (right) suspension soft pad assembly 4-2. Welded steel sleeves with smooth inner holes are used for connection and fixing with the vehicle body longitudinal beam.

[0069] The following is the molding process of a single part:

[0070] Electric drive unit frame assembly 1;

[0071] The main body is formed by welding multiple square steel bars of different specifications and small bent parts. Small round holes or oblong holes are then cut into it according to the requirements for fixing wire harness clips. According to the requirements of the specifications of the fixing points of the components installed on the electric drive unit frame assembly 1, the corresponding rivet nuts, rivet screws, projection weld nuts, threaded steel sleeves and plain steel sleeves are selected or processed, and the above components are connected to the main body of the frame by welding or riveting.

[0072] In this invention, the threaded steel sleeve is a hollow sleeve structure. The aforementioned threaded hole is actually a hole set in the support frame 10-10, and the threaded steel sleeve is embedded in the hole to form the aforementioned threaded hole. Similarly, the plain steel sleeve is also a hollow sleeve structure. The plain steel sleeve is embedded in the hole in the support frame 10-10, and finally forms the aforementioned mounting connection hole. Through the setting of the threaded steel sleeve and the plain steel sleeve, this invention greatly ensures the strength of the mounting threaded hole and the mounting connection hole.

[0073] Soft pad assembly 4-2

[0074] The die-cast bolt 2-1 and the support arm 2-2 are directly formed into a single structure through pressure casting. To ensure that the die-cast bolt 2-1 does not detach from the support arm 2-2, a bolt with a hexagonal head is specifically selected so that the hexagonal head is completely inside the support arm 2-2 structure during the one-piece die-casting process, thus meeting the anti-detachment requirement. The anti-detachment design is as follows... Figure 4 As shown;

[0075] The first connecting part 21-12 includes a first inner suspension tube 2-3, a first rubber main spring 2-4, and a first outer suspension tube 2-5. In this invention, the first inner suspension tube 2-3, the first rubber main spring 2-4, and the first outer suspension tube 2-5 are combined into a whole by vulcanization. The inner tube of the first connecting part 21-12 is different from the traditional exposed tube. Instead, it is designed to be completely wrapped by the rubber main spring and not exposed.

[0076] Welded bracket 2-6 is a suspension pad assembly formed by welding multiple small stamped parts 4-2 welded bracket 2-6;

[0077] The sub-parts formed by the above three steps are pressed into the welding bracket 2-6 of the suspension pad assembly 4-2 using a press-fitting equipment, and then the support arm 2-2 is pressed into the inner tube of the aforementioned bushing to complete the production of the parts.

[0078] The design of the inner tube being completely wrapped in rubber in the second step provides an interference fit when the support arm 2-2 is pressed into the inner tube, making the pressing tighter, and can prevent friction noise that may occur when the support arm 2-2 and the inner tube move relative to each other during actual vehicle application.

[0079] Left (Right) Suspension Bracket Assembly

[0080] The left and right suspension brackets are formed by the same process, only the structure is different. They are mainly plate bracket structures. In actual production, after the main structure is formed by casting, the mounting holes 3-5 or the mounting surface are processed to ensure positioning, installation and flatness requirements.

[0081] Rear suspension cushion assembly 6

[0082] The rear suspension frame 6-1 has the same molding process as the left and right suspension bracket assemblies 5 mentioned above, and will not be described again here;

[0083] The second connecting part includes a second suspension inner tube 6-2, a second rubber main spring 6-3, and a second suspension outer tube 6-4; in this invention, the second suspension inner tube 6-2, the second rubber main spring 6-3, and the second suspension outer tube 6-4 are vulcanized to form an integral structure;

[0084] The anti-collision pads 6-5 are made of vulcanized rubber, and are entirely made of rubber with no metal materials.

[0085] The sub-parts formed by the above three steps are press-fitted together with the second connecting part and the rear suspension frame using a press-fitting device. Then, the two anti-collision pads 6-5 are respectively fitted onto both ends of the inner tube. In order to prevent them from falling off during transportation and installation and affecting the anti-collision function, it is adhering them to the second connecting part with glue.

[0086] a. Separation of the left (right) suspension pad assembly 4-2 and the electric drive frame assembly:

[0087] Use bolts to pass through the four mounting holes on the left (right) suspension pad assembly 4-2 and connect them to the threaded steel sleeves on the electric drive unit frame assembly 1 (1-1 to 1-8 in the attached drawing are all threaded cylinder sleeves), thus completing the separate assembly of the left and right suspension pad assemblies 4 and the electric drive unit frame.

[0088] b. Separate assembly of the left and right suspension bracket assemblies 5 and the rear suspension cushion assembly 6 with the integrated motor:

[0089] Use bolts to connect and fix the left suspension bracket assembly to the corresponding threaded holes on the integrated motor through the three mounting holes on the side of the left suspension bracket assembly 3.

[0090] Use bolts to connect and fix the right suspension bracket assembly 5 to the corresponding threaded holes on the integrated motor by passing through the two mounting holes on the side and the two mounting holes on the top.

[0091] Use bolts to connect and secure the 6-rear suspension pad assembly to the corresponding threaded holes on the integrated motor by passing through the three mounting holes on the side and one auxiliary mounting hole at the rear.

[0092] c. Combine the sub-assemblies formed in the above two steps:

[0093] When assembling the sub-assembly structure formed by connecting the left and right suspension pad assemblies 4 and the electric drive unit frame assembly 1 with the sub-assembly structure formed by connecting the left and right suspension bracket assemblies 5, the rear suspension pad assembly 6, and the integrated motor, the die-cast bolts 2-1 on the left and right suspension pad assemblies 4 are respectively inserted into the two mounting holes at the top of the left and right suspension brackets, and then tightened at the bottom with nuts. Figure 7 , Figure 8 As shown, this completes the assembly of the front-wheel drive suspension system;

[0094] d. Assembly of the front-wheel drive suspension system with the vehicle:

[0095] The front-wheel drive suspension system, which has been assembled above, is hoisted and lowered into the front compartment of the vehicle and placed on the left and right longitudinal beams of the vehicle body. Bolts are used to pass through the mounting connection holes on the electric drive unit frame assembly 1 (the attached drawings are marked 1-9 to 1-12 as mounting connection holes) and connect and fix it to the mounting nuts pre-embedded on the left and right longitudinal beams of the vehicle body.

[0096] Use bolts to pass through the inner suspension tube 6-2 on the rear suspension pad assembly 6 and connect it to the suspension mounting point on the subframe already mounted on the vehicle body, and tighten it with a nut at the other end;

[0097] This completes the assembly of the front-wheel drive suspension system with the vehicle.

[0098] Through the above design;

[0099] It is possible to know;

[0100] The present invention has the following advantages:

[0101] Reduce development costs and unit costs;

[0102] Provide mounting points for components and various pipelines located in the forward compartment;

[0103] By not developing casting molds and large stamping molds, development costs can be reduced.

[0104] Reduce unit cost by using square steel welding and forming, which has a lower unit price and simpler production process.

[0105] The suspension system is designed with an electric drive unit frame assembly 1 to provide a closer mounting point for the suspension, reducing the suspension structure, reducing product materials, and increasing structural strength;

[0106] The electric drive unit frame assembly 1 can be equipped with additional mounting points or welded small mounting brackets as needed to meet the installation and fixing requirements of other components;

[0107] The main structure is formed by welding readily available standard square steel, and standard rivet nuts, rivet screws or projection weld nuts are used as installation and fixing solutions. Non-standard parts are not developed, which shortens the development cycle and reduces development costs and unit costs.

[0108] The main processes are cutting, welding, bending, riveting, and electrophoresis. The technology is mature and there is a wide range of suppliers to choose from.

[0109] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A precursor suspension system characterized by, Including electric drive unit frame assembly, The electric drive unit frame assembly comprises a support frame; the support frame is assembled by square steel; The electric drive unit frame assembly is provided with a soft pad assembly; the soft pad assembly comprises a welded support, the welded support is connected with a supporting arm, and the supporting arm is provided with a die-casting bolt; The welded support comprises a connecting sleeve; The first connecting part comprises a first suspension inner tube, a first rubber main spring and a first suspension outer tube; the first suspension inner tube, the first rubber main spring and the first suspension outer tube are integrated by vulcanization; The first suspension inner tube is wrapped by the first rubber main spring; The die-casting bolt is embedded in the supporting arm; the supporting arm is provided with a limiting protrusion; The front drive suspension system further comprises a rear suspension soft pad assembly; the rear suspension soft pad assembly comprises a rear suspension skeleton; the rear suspension skeleton is provided with a second connecting part; The second connecting part comprises a second suspension inner tube, a second rubber main spring and a second suspension outer tube; the second suspension inner tube, the second rubber main spring and the second suspension outer tube are integrated by vulcanization; the rear suspension soft pad assembly is connected with the integrated motor.

2. A precursor suspension system according to claim 1, wherein The support frame comprises two longitudinal square steels, a plurality of connecting square steels are arranged between the two longitudinal square steels; a plurality of mounting threaded holes are arranged on the longitudinal square steels and the connecting square steels; and a mounting connecting hole is arranged at the end of the longitudinal square steel.

3. A precursor suspension system according to claim 1, wherein The welded support comprises a connecting sleeve, connecting side plates are arranged on both sides of the connecting sleeve, end side plates are arranged at the ends of the connecting sleeve, the connecting side plates and the end side plates are in inverted L-shaped vertical section; and the end side plates and the connecting side plates are connected with the support frame.

4. A precursor suspension system according to claim 1, wherein The drive unit frame assembly is provided with two soft pad assemblies, one soft pad assembly is connected with a left suspension support assembly, and the other soft pad assembly is connected with a right suspension support assembly.

5. A precursor suspension system according to claim 1, wherein The rear suspension skeleton is provided with a collision pad on the side surface; the collision pad is arranged on the side surface of the second connecting part and the rear suspension skeleton.

6. The method of claim 1-5, wherein, The assembly method comprises the following steps: Step 1: determining the components of the front drive suspension system; Step 2: after step 1 is completed, two soft pad assemblies are arranged on the electric drive unit frame assembly to form a first sub-assembly; at the same time, the left suspension support assembly, the right suspension support assembly and the rear suspension soft pad assembly are assembled with the corresponding integrated motor to form a second sub-assembly; Step 3: after step 2 is completed, the first sub-assembly and the second sub-assembly are assembled; thus, the front drive suspension system is assembled.

7. The method of claim 6, wherein: After step 3 is completed, the front drive suspension system is assembled on the whole vehicle through the mounting connecting hole.

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