Rear auxiliary frame assembly and electric vehicle thereof

Abstract

The invention discloses a rear auxiliary frame assembly and an electric vehicle thereof.The rear auxiliary frame assembly comprises a main body frame structure and a suspension connecting support, and the main body frame structure is an integral frame structure formed by welding a set of longitudinal beams and a set of transverse beams; the suspension connecting support comprises a front suspension mounting support, a rear suspension mounting support and four suspension mounting supports located on the two sides, the front suspension mounting support and the rear suspension mounting support are arranged on the corresponding cross beams, and the suspension mounting supports on the two sides are arranged on the corresponding longitudinal beams. The four suspension connecting supports are accurately distributed on key stress parts of a front cross beam, a rear cross beam, a left rear framework and a right rear framework of the rear auxiliary frame to form a symmetrical supporting system with front-back positioning and left-right stability, compared with existing scattered mounting points, the radial and axial displacement after a motor is fixed is greatly reduced, and the stability of the motor is improved. The motor is prevented from inclining and moving when the vehicle bumps on a non-paved road surface, climbs or suddenly turns; motor installation is stable and reliable, and vehicle operation reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a rear subframe assembly and an electric vehicle thereof. Background Technology

[0002] In the field of electric UTVs (All-Terrain Vehicles), the motor is the core power source, and the stability and rationality of its structural installation are crucial to the overall performance of the vehicle. As the application scenarios of electric UTVs continue to expand, from leisure and entertainment to various complex working conditions such as outdoor operations, higher demands are placed on the stability and vibration damping of the motor installation. Currently, electric UTV motors are mostly installed by directly connecting the motor to the vehicle frame via a simple bracket. This bracket is typically a single metal component designed to provide basic load-bearing support for the motor.

[0003] The existing rear subframe motor mounting points are scattered and lack a reasonable layout, mostly with two or three-point support, making it difficult to form a comprehensive and stable constraint on the motor. When the vehicle is driving on bumpy, uphill, or other complex terrains, the motor is prone to shaking and displacement, affecting the continuity and efficiency of power transmission. Secondly, the connection between the simple bracket and the frame is mostly a rigid connection, lacking an effective vibration damping structure. The vibration generated by the motor operation is directly transmitted to the frame, which not only aggravates the wear of the motor itself and related frame components, reducing its service life, but also causes the driver and passengers to feel obvious vibration, affecting ride comfort. Furthermore, the existing bracket installation methods are mostly non-removable or cumbersome to disassemble. When the motor fails and needs to be repaired or replaced, it is often necessary to disassemble part of the frame structure, which is complicated, time-consuming, and labor-intensive, resulting in poor maintenance convenience.

[0004] For example, patent CN203651907U discloses a detachable subframe structure, which includes a frame structure formed by two parallel horizontal longitudinal beams and two parallel horizontal transverse beams connected together. The same end of the two horizontal longitudinal beams is connected to a vertical longitudinal beam perpendicular to the horizontal longitudinal beams. A suspension support frame beam is connected downward to the horizontal longitudinal beams through a connecting bracket. A suspension support transverse beam is connected to the part of the horizontal transverse beam that protrudes from the horizontal longitudinal beams. A rear mounting bracket for the suspension is provided on the horizontal transverse beam. The suspension support frame beam, the suspension support transverse beam, and the rear mounting bracket for the suspension together constitute the mounting support point of the suspension system; forming a basic horizontal suspension support structure. The motor installation stability is not high, and it cannot be used in electric UTV vehicles. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rear subframe assembly and its electric vehicle, aiming to achieve stable and reliable motor installation and improve vehicle operational reliability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A rear subframe assembly includes a main frame structure and a suspension connection bracket. The main frame structure is an integral frame structure formed by welding a set of longitudinal beams and a set of transverse beams. The suspension connection bracket includes four suspension mounting brackets at the front, rear, and on both sides. The front and rear suspension mounting brackets are mounted on the corresponding transverse beams, and the side suspension mounting brackets are mounted on the corresponding longitudinal beams.

[0007] Further or preferred: The set of longitudinal beams includes two lower longitudinal beams located at the bottom and two upper longitudinal beams located at the top. The two lower longitudinal beams are welded together by a set of crossbeams, and the lower and upper longitudinal beams on the corresponding sides are connected by a set of skeletons.

[0008] The main frame structure has a body shaft mounting structure on each of the two upper longitudinal beams for connecting the carriage.

[0009] The main frame structure has a trailer hook bracket body on the rear crossbeam, and the side of the trailer hook bracket body and the rear crossbeam are connected by a trailer hook bracket side support plate.

[0010] The inner side of the lower longitudinal beam is connected to the end of the corresponding crossbeam, the lower end of the frame is connected to the outer side of the lower longitudinal beam, and the lower end of the frame is aligned with the end of the corresponding crossbeam.

[0011] The two side suspension mounting brackets are respectively installed on the corresponding upper longitudinal beams. The two side suspension mounting brackets are arranged opposite each other, and the front and rear suspension mounting brackets are arranged opposite each other, forming a four-point symmetrical installation structure.

[0012] A supporting inclined beam is provided between the upper longitudinal beam and the frame, corresponding to the vehicle body pivot mounting structure.

[0013] The suspension mounting bracket is provided with a suspension structure, which includes a metal frame and a connecting sleeve for connecting the suspension mounting bracket. The connecting sleeve is located inside the metal frame and the two are connected by a vulcanized rubber buffer structure. One side of the metal frame is a mounting plate structure, and the mounting plate structure is provided with a connecting hole for connecting the motor.

[0014] The vulcanized rubber cushioning structure includes an outer ring of a rubber cushioning layer assembly, a rubber cushioning layer, and an inner ring of a rubber cushioning layer assembly; the outer ring of the rubber cushioning layer assembly is connected to a metal skeleton, and the inner ring of the rubber cushioning layer assembly is connected to a connecting sleeve. The outer ring of the rubber cushioning layer assembly, the rubber cushioning layer, and the inner ring of the rubber cushioning layer assembly are an integral vulcanized structure.

[0015] An electric vehicle includes a body and the aforementioned rear subframe assembly, wherein the front part of the integral frame structure is welded to the body to form an integral frame structure.

[0016] Compared with the prior art, the present invention has the following advantages: 1. Four-point symmetrical installation structure: Four suspension connection brackets are precisely distributed on the front crossbeam, rear crossbeam and key stress parts of the left and right rear frame of the rear subframe, forming a symmetrical support system of "front and rear positioning + left and right stability". Compared with the existing scattered installation points, the radial and axial displacement after the motor is fixed is greatly reduced, avoiding the motor from tilting or swaying when the vehicle is bumping on unpaved roads, climbing hills or making sharp turns.

[0017] 2. Uniform load-bearing and stress dispersion: The symmetrical layout ensures that the weight of the motor and the torque generated during operation are evenly distributed to the entire rear subframe, rather than concentrated at local points. This significantly reduces the stress load on a single mounting point, eliminates problems such as bracket deformation and breakage caused by excessive local stress, and ensures that the motor can maintain stable power output under high-intensity working conditions (such as heavy loads and long-term off-road driving), reducing the risk of power interruption failure.

[0018] 3. Stable installation reduces internal motor losses: When the motor operates in a stable, displacement-free state, it avoids uneven gaps between the rotor and stator caused by vibration and tilting, reducing electromagnetic and mechanical friction losses during motor operation, thus improving motor efficiency. At the same time, it reduces the risk of motor failures such as coil burnout and bearing damage caused by local overheating (caused by excessive losses).

[0019] 4. Combining strength, vibration reduction, and noise reduction: The suspension connection bracket is fixed to the rear subframe through full welding to ensure connection strength; the rubber buffer layer of the suspension can effectively absorb the vibration generated by the motor during operation, reduce the transmission of motor vibration to the frame, improve ride comfort, and reduce wear on motor and frame components; on the other hand, it significantly reduces frame resonance and noise caused by vibration, significantly reducing cabin noise and significantly improving ride comfort.

[0020] 5. Removable and individually replaceable suspension mounts reduce total lifecycle costs: The suspension mounts, mounting brackets, and motors are all bolted and detachable. During future maintenance and repairs, the motor and suspension mounts do not need to be disassembled as a whole rear subframe. Only the bolts at both ends of the suspension mount need to be removed to separate the motor and suspension mounts, significantly shortening maintenance time and reducing the risk of secondary damage to the rear subframe. More importantly, if the suspension rubber buffer layer ages or breaks, the rubber buffer layer assembly in the suspension mount can be replaced separately while retaining the metal frame of the suspension mount. The entire suspension mount does not need to be replaced together. Compared with the existing integrated suspension system, the maintenance cost is significantly reduced.

[0021] 6. Compatible with multiple motor models: The four-point symmetrical mounting structure and detachable suspension connection method allow for the adaptation of UTV motors of different power and size by adjusting the position of the suspension mounting bracket or replacing different suspensions. This eliminates the need to redesign the overall structure of the rear subframe, reducing the cost of product platform development and enabling the expansion of more different configuration models. Attached Figure Description

[0022] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings: Figure 1 This is a schematic diagram of the rear subframe assembly structure of the present invention.

[0023] Figure 2 This is a cross-sectional schematic diagram of the front suspension structure of the vehicle frame of the present invention.

[0024] Figure 3 This is a cross-sectional schematic diagram of the rear suspension structure of the vehicle frame of the present invention.

[0025] Figure 4 This is a cross-sectional schematic diagram of the left suspension structure of the vehicle frame of the present invention.

[0026] Figure 5 This is a cross-sectional schematic diagram of the right suspension structure of the vehicle frame of the present invention.

[0027] Figure 6 This is a schematic diagram of the assembly relationship of the present invention, which is suspended and mounted on the corresponding bracket.

[0028] Figure 7 This is a schematic diagram showing the connection and installation of the motor and suspension system of the present invention on the subframe.

[0029] Figure 8 This is a schematic diagram of the rear subframe of the present invention being mounted on the vehicle body.

[0030] In the picture: 1- Rear subframe assembly; 10-Main frame structure: 101-Longitudinal beam I, 102-Horizontal beam I, 103-Horizontal beam II, 104-Horizontal beam III, 105-Longitudinal beam II, 106-Horizontal beam IV, 107-Frame I, 108-Frame II, 109-Horizontal beam V; 11-Suspension connection bracket: 111-Front suspension mounting bracket, 112-Rear suspension mounting bracket, 113-Left suspension mounting bracket, 114-Right suspension mounting bracket; 12-Functional component mounting structure: 121-One-side support beam, 122-The other-side support beam; 13-Auxiliary connection and reinforcement components: 131-Body pivot mounting point, 132-Sheet metal bracket, 133-Vehicle tool bracket, 134-Trailer hook bracket side support plate, 135-Trailer hook bracket body, 136-Trailer hook assembly; 2-Motor mounting system; 20-Front suspension: 201-Metal frame I, 202-Outer ring I of rubber buffer layer assembly, 203-Rubber buffer layer I, 204-Inner ring I of rubber buffer layer assembly; 21-Rear suspension: 211-Metal frame II, 212-Outer ring II of rubber buffer layer assembly, 213-Rubber buffer layer II, 214-Inner ring II of rubber buffer layer assembly; 22-Left suspension: 221-Metal frame III, 222-Outer ring III of rubber buffer layer assembly, 223-Rubber buffer layer III, 224-Inner ring III of rubber buffer layer assembly; 23-Right suspension: 231-Metal frame IV, 232-Outer ring of rubber buffer layer assembly IV, 233-Rubber buffer layer IV, 234-Inner ring of rubber buffer layer assembly IV; 301 - Normal bolt, 302 - Normal nut; 31 - Motor connection bolt; 4-Motor assembly; 5-Carriage; 6-Body of the vehicle. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0032] Although the invention has been shown and described herein with reference to specific embodiments, it is not intended to be limited to the details shown. Rather, various modifications in detail may be made within the equivalent scope and scope of the claims without departing from the invention. In the drawings, the same item numbers refer to the same elements.

[0033] Throughout this disclosure, various terms are used to describe the physical shape or arrangement of features. Many of these terms are used to describe features conforming to a cylindrical or generally cylindrical geometry with the feature as its radius and a central axis perpendicular to that radius. Unless otherwise specified, the terms are given the following meanings: The terms “longitudinal,” “longitudinal,” “axial,” and “axial” refer to a direction, dimension, or orientation parallel to the central axis. The terms “radial” and “radially” refer to a direction, dimension, or orientation perpendicular to the central axis. The terms “inward” and “inner” refer to a direction, dimension, or orientation extending radially toward the central axis. The terms “outward” and “outer” refer to a direction, dimension, or orientation extending radially away from the central axis.

[0034] In this specification, relative terms such as “horizontal,” “vertical,” “upward,” “downward,” “top,” and “bottom,” and their derivatives (e.g., “horizontal,” “downward,” “upward,” etc.) should be interpreted as referring to the direction described or the direction shown in the accompanying drawings. These relative terms are for ease of description and are not generally intended to require a specific direction.

[0035] like Figures 1 to 8As shown, the rear subframe assembly 1 includes a main frame structure 10, a suspension connection bracket 11, a functional component mounting structure 12, and auxiliary connection and reinforcing components 13. The main frame structure is an integral frame structure formed by welding a set of longitudinal beams and a set of transverse beams. The suspension connection bracket includes four suspension mounting brackets located at the front, rear, and sides. The front and rear suspension mounting brackets are mounted on the corresponding transverse beams, and the side suspension mounting brackets are mounted on the corresponding longitudinal beams.

[0036] A set of longitudinal beams includes two lower longitudinal beams at the bottom and two upper longitudinal beams at the top. The two lower longitudinal beams are welded together by a set of crossbeams, and the lower and upper longitudinal beams on corresponding sides are connected by a set of frames. Suspension mounting brackets on both sides are respectively set on the corresponding upper longitudinal beams. The suspension mounting brackets on both sides are arranged opposite each other, and the front and rear suspension mounting brackets are arranged opposite each other, forming a four-point symmetrical installation structure.

[0037] Four suspension connection brackets are precisely distributed on the front crossbeam, rear crossbeam, and key stress-bearing parts of the left and right rear frames of the rear subframe, forming a symmetrical support system of "front and rear positioning + left and right stability". Compared with the existing scattered installation points, the radial and axial displacement after fixing the motor is greatly reduced, avoiding the motor from tilting or swaying when the vehicle is bumping on unpaved roads, climbing hills, or making sharp turns.

[0038] The main frame structure is composed of multiple components such as longitudinal beams, cross beams, and skeletons connected together. It includes two lower longitudinal beams as the foundation, front and rear cross beams set at certain intervals, and the upper and lower longitudinal beams connected by the skeleton to form an overall load-bearing frame. The rear cross and longitudinal beams connect to the body part, providing the installation foundation for various parts of the vehicle and ensuring the overall strength and rigidity of the frame to withstand various loads during vehicle operation.

[0039] The suspension mounting brackets include a front suspension mounting bracket 111, a rear suspension mounting bracket 112, a left suspension mounting bracket 113, and a right suspension mounting bracket 114. The front suspension mounting bracket is welded to the right side of the first lower crossbeam according to the motor position, and is used to connect the front suspension. The rear suspension mounting bracket is welded to the right side of the frame above the fourth lower crossbeam, and is used to connect the rear suspension. The left suspension mounting bracket is welded to the third frame on the left, and is used to connect the left suspension. The right suspension mounting bracket is welded to the third frame on the right, and is used to connect the right suspension. The mounting points on the crossbeams and frames can be freely changed according to the different motor connection hole positions, achieving flexible and adaptable installation.

[0040] The main frame structure has two upper longitudinal beams equipped with body axle mounting structures for connecting the carriage 5, forming body axle mounting points 131. Supporting diagonal beams are provided between the upper longitudinal beams and the frame corresponding to the body axle mounting structures. A supporting diagonal beam 121 is provided at the lower part of one side of the longitudinal beam, and another supporting diagonal beam 122 is provided at the lower part of the other side of the longitudinal beam. A trailer hook bracket body 135 is provided on the rear crossbeam of the main frame structure. The side of the trailer hook bracket body and the rear crossbeam are connected by a trailer hook bracket side support plate 134. A trailer hook assembly 136 is provided at the rear end of the trailer hook bracket body. The inner side of the lower longitudinal beam is connected to the end of the corresponding crossbeam, and the lower end of the frame is connected to the outer side of the lower longitudinal beam. The lower end of the frame is aligned with the end of the corresponding crossbeam. The structure is stable and reliable.

[0041] The functional component mounting structure 12 includes a reinforcing beam connecting the first frame on the left and right sides to the upper longitudinal beam, and a welded frame connecting the rear suspension mounting bracket to the rear cross beam, etc. These components help to enhance the structural stability of the frame, distribute the load, and avoid local stress concentration.

[0042] The auxiliary connection and reinforcement components 13 include two body pivot mounting points on the upper part of the frame: for connecting with the upper cargo box to realize the automatic unloading function of the cargo box; sheet metal brackets 132 on both sides of the upper longitudinal beam (which can suspend parts according to actual needs); a vehicle tool bracket 133 welded to the crossbeam below; and a bracket connecting the tow hook in the middle.

[0043] The symmetrical layout ensures that the weight of the motor and the torque generated during operation are evenly distributed to the entire rear subframe, rather than concentrated at local points. This evenly distributes stress, significantly reducing the stress load on individual mounting points and preventing problems such as bracket deformation and breakage due to excessive local stress. It also ensures that the motor can maintain stable power output under high-intensity operating conditions (such as heavy loads and long-term off-road driving), reducing the risk of power interruption failures.

[0044] When the motor operates in a stable, displacement-free state, it avoids uneven gaps between the rotor and stator inside the motor caused by vibration and tilting, reduces electromagnetic and mechanical friction losses during motor operation, improves motor efficiency, and reduces the risk of coil burnout, bearing damage, and other malfunctions caused by local overheating (caused by excessive losses).

[0045] The suspension mounting bracket is equipped with a suspension structure, which includes a metal frame and a connecting sleeve for connecting the suspension mounting bracket. The connecting sleeve is located inside the metal frame and the two are connected by a vulcanized rubber buffer structure. One side of the metal frame is a mounting plate structure with a connection hole for connecting the motor. The vulcanized rubber buffer structure includes an outer ring of a rubber buffer layer assembly, a rubber buffer layer, and an inner ring of a rubber buffer layer assembly. The outer ring of the rubber buffer layer assembly is connected to the metal frame, and the inner ring of the rubber buffer layer assembly is connected to the connecting sleeve. The outer ring, rubber buffer layer, and inner ring of the rubber buffer layer assembly are an integral vulcanized structure; this effectively reduces noise and provides a stable and reliable structure.

[0046] Specifically, the motor mounting system 2 includes: a front mount 20, a rear mount 21, a left mount 22, and a right mount 23. The four mounts have different structures due to their different connection points with the motor, but their basic composition is always a "mount metal frame + metal vulcanized rubber buffer layer". The metal vulcanized rubber buffer layer consists of an outer ring of the rubber buffer layer assembly, a rubber buffer layer, and an inner ring of the rubber buffer layer assembly, which are bonded together as a single component and installed into the mount metal frame through a vulcanization process. One end of the metal frame has mounting holes for connection with the mount mounting brackets, and the other end has an interference fit with the metal vulcanized rubber buffer layer. First, the four mounts are fixed to their corresponding brackets with bolts to form a stable mounting platform. Then, the four mounting positions of the motor are aligned with the corresponding holes of the four mounts, and the bolts are tightened to complete the installation of the motor and the rear subframe.

[0047] The suspension connection bracket is fixed to the rear subframe by full welding to ensure connection strength; the rubber buffer layer of the suspension can effectively absorb the vibration generated by the motor during operation, reduce the transmission of motor vibration to the frame, improve ride comfort, and reduce wear on motor and frame components; on the other hand, it greatly reduces frame resonance and noise caused by vibration, significantly reducing cabin noise and significantly improving ride comfort.

[0048] Removable and individually replaceable suspension mounts reduce total lifecycle costs: The suspension mounts, mounting brackets, and motors are all bolted and detachable. During future maintenance and repairs, the motor and suspension mounts do not need to be disassembled as a whole rear subframe. Only the bolts at both ends of the suspension mount need to be removed to separate the motor and suspension mounts, significantly shortening maintenance time and reducing the risk of secondary damage to the rear subframe. More importantly, if the suspension rubber buffer layer ages or breaks, the rubber buffer layer assembly in the suspension mount can be replaced separately while retaining the metal frame of the suspension mount. The entire suspension mount does not need to be replaced together, resulting in significantly lower maintenance costs compared to existing integrated suspension systems.

[0049] The four-point symmetrical mounting structure and detachable suspension connection allow for the adaptation of UTV motors of different power and size by adjusting the position of the suspension mounting bracket or replacing different suspensions. This eliminates the need to redesign the overall structure of the rear subframe, reducing the cost of product platform development and enabling the expansion of more different configuration models.

[0050] like Figure 8 As shown, the present invention provides an electric vehicle, including a body 6 and the aforementioned rear subframe assembly, wherein the front part of the integral frame structure is welded to the body to form an integral frame structure.

[0051] A preferred embodiment of the present invention is as follows: This invention provides a new electric UTV rear subframe assembly and motor mounting system, which consists of two parts: the rear subframe and the motor mounting system.

[0052] Rear subframe assembly reference Figure 1 , Figure 7 , Figure 8 The structure comprises two layers, connected by multiple frame members I107 and II108. Frame member I107 is a parallelogram at a certain angle for easy connection to the vehicle body. Frame member II108 is a U-shaped connecting bracket supporting the longitudinal and transverse beams of the upper and lower layers. The lower layer has two longitudinal beams I101 spaced at intervals, a front crossbeam I102 connecting the two longitudinal beams I101, and three crossbeams II103. The rear end of the longitudinal beams I101 connects to the rear crossbeam III104. The front crossbeam I102 and the rear crossbeam III104 are at the same height, while the crossbeams II103 are lower than the front crossbeams I102 and the rear crossbeam III104. The upper layer consists of two longitudinal beams II105 and two crossbeams IV106. Counting from the front to the back of the lower layer, a crossbeam V109 is located above the third crossbeam, connecting to the two frame members II108. When the rear subframe is installed on the car, the front crossbeam faces the rear of the vehicle, and the rear crossbeam connects to the body. (Refer to the following for reference.) Figure 8 .

[0053] The front suspension mounting bracket 111 is mounted on the front crossbeam I 101, the rear suspension mounting bracket is mounted on the crossbeam 109V, the left suspension mounting bracket is mounted on the third frame II 108 on the left, and the right suspension mounting bracket is mounted on the third frame II 108 on the right.

[0054] On each of the two upper longitudinal beams II105, near the front crossbeam I101, there is a welded body pivot mounting point 131. The cargo box can be mounted on top of the rear subframe via these mounting points, enabling functions such as automatic cargo unloading. (See reference for details.) Figure 1 , Figure 8 Below each of the two upper longitudinal beams II105, there is a sheet metal bracket 132, which can be used to install components according to actual needs. (See reference...) Figure 1 , Figure 7 Two tool brackets 133 are installed between the lower longitudinal beam I 101 and the front crossbeam I 102 to accommodate the installation and fixation of tools at the rear of the vehicle. A trailer hitch mounting bracket 135 and its side support plate 134 are located in the middle of the front crossbeam 102, jointly enabling the installation and replacement of the trailer hitch assembly 136. On both sides of the rear subframe, two diagonal beams are installed between the first frame II 108 and the upper longitudinal beam II 105 bracket to improve the load-bearing capacity of the rear subframe and the entire vehicle. A similar structure connects the rear suspension mounting bracket connecting crossbeam V 109 and the rear crossbeam III 104, which will not be elaborated upon here. In addition, the U-shaped frame II 108 used to connect the rear subframe has multiple mounting holes for adding components as needed.

[0055] The motor mounting system consists of four parts: front mount 20, rear mount 21, left mount 22, and right mount 23, which together connect the motor to the rear subframe. The four mounts are mounted on the rear subframe in a symmetrical four-point layout, as shown in the reference diagram. Figure 1 , Figure 7 For specific details on the suspension structure, please refer to [reference needed]. Figure 2 , Figure 3 , Figure 4 , Figure 5 Each suspension mount is designed based on the corresponding hole position on the motor, making each one unique. However, its components are all divided into four parts: a metal frame, an outer ring of the rubber buffer layer assembly, the rubber buffer layer itself, and an inner ring of the rubber buffer layer assembly. The outer ring, the rubber buffer layer itself, and the inner ring of the rubber buffer layer assembly are combined into a single component called the rubber buffer layer assembly using a vulcanization process. The rubber buffer layer assembly is then press-fitted into the corresponding part of the metal frame.

[0056] The front suspension 20 includes a metal frame I 201, an outer ring I 202 of the rubber buffer layer assembly, a rubber buffer layer I 203, and an inner ring I 204 of the rubber buffer layer assembly; the rear suspension 21 includes a metal frame II 211, an outer ring II 212 of the rubber buffer layer assembly, a rubber buffer layer II 213, and an inner ring II 214 of the rubber buffer layer assembly; the left suspension 22 includes a metal frame III 221, an outer ring III 222 of the rubber buffer layer assembly, a rubber buffer layer III 223, and an inner ring III 224 of the rubber buffer layer assembly; the right suspension 23 includes a metal frame IV 231, an outer ring IV 232 of the rubber buffer layer assembly, a rubber buffer layer IV 233, and an inner ring IV 234 of the rubber buffer layer assembly. The four suspension structures are basically the same, which can effectively reduce costs.

[0057] The end of the front suspension 20 with the rubber buffer layer is connected to the front suspension mounting bracket 111 to the rear subframe via a face bolt 301 and a face nut 302. The face bolt and face nut can effectively prevent the bolts from loosening due to motor vibration, and the cost is lower than that of spring washers, and the installation is also convenient and quick. The metal frame I 201 has four motor connection holes, which are connected to the front mounting holes of the motor via four motor connection bolts 31, further completing the connection between the subframe, suspension, and motor. The rear suspension 21 is similar in structure to the front suspension 20, with one end connected to the rear suspension mounting bracket 112 and the other end connected to the rear motor mounting hole. The left suspension 22 has three motor connection holes on the metal frame III 221, arranged in an isosceles triangle, which are connected to the left side of the motor mounting hole via three motor connection bolts 31. The right suspension 23 has two motor connection holes on the metal frame IV 231. To correspond with the mounting holes on the motor, the line connecting the two holes forms a certain angle with the projection of the axis of the inner ring of the rubber buffer layer assembly, and is connected to the right side of the motor mounting hole via two bolts 31. The motor assembly 4 is mounted to the rear subframe via the suspension system 2. The vibration generated by the motor during operation is effectively absorbed by the rubber buffer layer in the suspension and will not be transmitted to the rear subframe or the entire vehicle body, affecting its structural stability.

[0058] The above description is merely an illustration of preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0059] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A rear subframe assembly, comprising a main frame structure and a suspension connection bracket, characterized in that: The main frame structure is an integral frame structure formed by welding a set of longitudinal beams and a set of transverse beams. The suspension connection bracket includes four suspension mounting brackets located at the front, rear, and both sides. The front and rear suspension mounting brackets are set on the corresponding transverse beams, and the side suspension mounting brackets are set on the corresponding longitudinal beams.

2. The rear subframe assembly as described in claim 1, characterized in that: The set of longitudinal beams includes two lower longitudinal beams located at the bottom and two upper longitudinal beams located at the top. The two lower longitudinal beams are welded together by a set of crossbeams, and the lower and upper longitudinal beams on the corresponding sides are connected by a set of skeletons.

3. The rear subframe assembly as described in claim 2, characterized in that: The main frame structure has a body shaft mounting structure on each of the two upper longitudinal beams for connecting the carriage.

4. The rear subframe assembly as described in claim 2, characterized in that: The main frame structure has a trailer hook bracket body on the rear crossbeam, and the side of the trailer hook bracket body and the rear crossbeam are connected by a trailer hook bracket side support plate.

5. The rear subframe assembly as described in claim 2, characterized in that: The inner side of the lower longitudinal beam is connected to the end of the corresponding crossbeam, the lower end of the frame is connected to the outer side of the lower longitudinal beam, and the lower end of the frame is aligned with the end of the corresponding crossbeam.

6. The rear subframe assembly as described in claim 2, characterized in that: The two side suspension mounting brackets are respectively installed on the corresponding upper longitudinal beams. The two side suspension mounting brackets are arranged opposite each other, and the front and rear suspension mounting brackets are arranged opposite each other, forming a four-point symmetrical installation structure.

7. The rear subframe assembly as described in claim 3, characterized in that: A supporting inclined beam is provided between the upper longitudinal beam and the frame, corresponding to the vehicle body pivot mounting structure.

8. The rear subframe assembly as described in claim 1, characterized in that: The suspension mounting bracket is provided with a suspension structure, which includes a metal frame and a connecting sleeve for connecting the suspension mounting bracket. The connecting sleeve is located inside the metal frame and the two are connected by a vulcanized rubber buffer structure. One side of the metal frame is a mounting plate structure, and the mounting plate structure is provided with a connecting hole for connecting the motor.

9. The rear subframe assembly as described in claim 8, characterized in that: The vulcanized rubber cushioning structure includes an outer ring of a rubber cushioning layer assembly, a rubber cushioning layer, and an inner ring of a rubber cushioning layer assembly; the outer ring of the rubber cushioning layer assembly is connected to a metal skeleton, and the inner ring of the rubber cushioning layer assembly is connected to a connecting sleeve. The outer ring of the rubber cushioning layer assembly, the rubber cushioning layer, and the inner ring of the rubber cushioning layer assembly are an integral vulcanized structure.

10. An electric vehicle, comprising a body, characterized in that, It also includes the rear subframe assembly as described in any one of claims 1 to 9, wherein the front part of the integral frame structure is welded to the vehicle body to form an integral frame structure.

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